I think most people are familiar, in one way or another, with the characteristics of the chemical elements we are going to talk about in this post: nitrogen (N) and phosphorus (P). Nitrogen in its gaseous from (N2) is part of the composition of atmospherica air or we even know it in another of its typical forms, ammonia (NH3), either as a gas or as a liquid solution (in this case as ammonium NH4 ). Phosphorus, on the other hand, is involved in vital functions in living organisms, as well as being one fo the main components of RNA and DNA molecules and is used to store and transport energy in the form of adenosine triphosphate (ATP). Well, today in this post we are going to go deeper into why these two elements are also important for other issues related to human beings and their development, we will explain the importance of nitrogen (N) and (P) as agronomic nutrients and how they are related to the concept of Circular Economy (a concept that has been very topical in recent years). Therefore, from now on, when we talk about nutrients in this post, it will always be focused from an agronomic point of view and nto from a human food point of view. Let´s start!
Both nitrogen (N) and phosphorus (P), together with potassium (K), form the group of agronomic macronutrients, which are the three main macroelements that plants or crops need to incorporate for their growth. Thus, in most cases, the fertilisers that are synthesises, and used nowadays in agriculture have an important composition of these elements (we usually talk about the NPK content in these products).
The first uestion to ask is how are these fertilisers synthesisesd?
Almost all of the N used in the formulation of fertilisers is obtained from the synthesis of ammonia, the classic procedure for obtaining ammonia being the Haber-Bosch process. Subsequently, the ammonia obtained by the Haber-Bosch process is oxidised to give rise to nitric acid (HNO3), from which the main mineral fertilisers can be obtained, synthesised from ammonium nitrate [(NH4)NO3]. The other main source of N for fertilisers synthesis is urea [(NH2)2CO]. As far as phosphorus is concerned, the main raw materials for its use in fertilisers is apatite, which is a set of minerals obtained through the extraction of the mineral phosphate rock. Therefore, the first thing we can realise is that, in both cases, the origin of N and O for obtaining traditional fertilisers is a non-renewable origin.
In addition to this, there is another factor of great importance, namely the increase in the world´s population. According to United Nations (UN) forecasts, the world population will reach 8.6 billion in 2030 and 9.8 billion in 2050. It is clear that these facts will lead to a significant increase in pressure from the food industry, which will be forced to increase its production, leading to more intensive agricultural practices and therefore an increase in land use and consumption of water, energy and traditional non-renewable fertilisers. Another worrying fact abut this scenario is that the countries of the European Union (EU) are tremendously dependent on imports of these compounds that act as raw materials fot fertilisers. To give you an idea, the EU imports around 30% of the N, more than 60% of the P and 70% of the K of the ttal nutrients consumed as fertilisers products in its countries. This issue is even more dramatic in the case of P, as five countries worldwide hold 90% of the world´s reserves (China, Morocco, South Africa, the United States and the Jordan region). This has led the EU to classify P as a Critical Raw Material (COM(2017)490), as it is crucial for the EU´s own growth, competitiveness and especially for a sustainable food industry.
Against this backdrop, it is clear that the search for and introduction of alternative and renewable soruces of N and P, as well as novel technologies for the production of sustainable fertiliser products, is necessary.
And this is where the Circular Economy comes into play, on the one hand, and the concept of nutrient recovery on the ohter. Nutrient recovery is one of the main lines of research that we have been developing in recent years within the Circular Economy area of the CARTIF Technology Centre. Nutrient recovery consists of the development of methodologies, techniques and technologies that make it possible to obtain the N and P they contain from sustainable raw materials and that these elements are in a convenient and effective form for their subsequent use in the synthesis of bioproducts or sustainable fertilisers that can replace traditional mineral fertilisers or, failing that, increase the renewable component in the synthesis of the latter. It is important to highlight that, although nutrient recovery is mainly focused on the recvery of N and P, the recovery of ther agronomic macro and micronutrients, such as K, magnesium (Mg), calcium (Ca) ,etc., can also be achieved.
So what raw materials or sources of renewable origin can we use for nutrient recovery?
Nutrient recovery mainly focuses on two groups: agricultural and livestock waste and wastewater. By agricultural and livestock waste we mean any waste generated directly by agricultural or livestock activity (manure, slurry,etc.), as well as wastewater (both urban and industrial). In addition, and related to the above, biological waste or by-products obtained in the treatment of such waste could also be used in the recovery of nutrients (a clear example would be the digestate obtained from the treatment of such waste by anaerobic management of the sludge obtained in wastewater ttreatment processes in Wastewater Treatment Plants (WWTPs),etc.).
An important aspect to highlight is that nutrient recovery technologies depend to a large extent on the characteristics of the raw material we use to recvoer N and P and how this raw material is presented (in solid or liquid state). Thus, the simplest methods of nutrient recovery are the direct use as fertilisers of solid wastes or by-products such as activated sludge or manures and digestate or the composting of these. However, logistical aspects (cost of transport and management of the waste, which often contains high moisture) can make the process unfeasible. At the same time, direct application of the waste does not provide effective fertilisation and can lead to overfertilisation phenomena that can trigger eutrophication phenomena (due to the accumulation of N and P present in the soil that has not been assimilated by the crop and can subsequently be washed away by rain or run off and finally deposited in aquifers and bodies of water), with the consequent environmental damage. In additionm the residues may contain significant cmounts of potentially hazardous contaminants, which need to be removed prior to their use as fertilisers. For this reason, waste treatment technologies for N and O recovery are becoming increasingly popular. There are different technologies to recover N and P from liquid wastes, such as biological treatments, stripping, crystallisation, membrane filtration, thermochemical methods (pyrolysis and gasification) or physical treatments (concentration, drying,etc.).
But as all this is best understood with an example, we will try to explain one of the processes in which we have investigated in CARTIF some of our projects.
It is the recovery of nutrients from crystallisation. Crystallisation is a separation operation frequently used in Chemical Engineering, thanks to which purification of fluids is produced through the formation of solids, taking into account the solubility of the products that are of interest for their separation. Thus, crystallisation can be used to recover N and P from wastewater or liquid agricultural and livestock waste (liquid phase of digestate and manuse or slurry) in the form of struvite.
But, wait a minute, let´s take it one step at a time, what is struvite?
Struvite
Struvite is a salt (mineral orthiphosphate) containing magnesium, ammonium and phosphate in equal molar concentrations, specifically, struvite in the form of magnesium ammonium phosphate hexahydrate has the following molecular formula MgNH4PO4-6H20. Struvite crystallisation occurs easily when the ideal conditions are met (presence of a significant Mg, N and P contract, pH,etc.). In fact, struvite gained public attention in the 1960s as a result of the clogging of pipes in WWTPs, in which it crystallised spontaneously.
And now, we may think, okay, we know what struvite is, but how is it obtained?
The waste to be used as a raw material to extract N and P (normally wastewater or digestate obtained from the anaerobic digestion of waste such as pig slurry) is simply introduced into a crystallisation reactor and a certain amount of magnesium is added (normally in the form of MgCI2 or MgO) and depending on the pH of the reaction mixture, a base (NaOH) can be added to raise the pH (8-9). Once all the components are in the reactor, agitation (either mechanical or by aeration) is applied.
The Mg comes into contact with the N and P of the raw material and little by little the struvite crystals grow, according to the following chemical reaction:
After approximately one hour of reaction, most of the P contained in the raw material (and an equivalent amount of N and Mg) is recovered in the form of a whitish solid crystal, struvite. This solid has very good properties for use as a fertiliser, as struvite has a high concentration of P and, due to its physical characteristics (low solubility), the product can be used as a slow-release fertiliser, i.e., unlike traditional fertilisers, struvite releases nutrients according to the needs of the plant and its stage of growth, making it a more effective fertiliser and avoiding eutrophication and similar phenomena.
There are several struvite crystallisation technologies on the market (with different configurations, reactor types, morphologies,etc.), most of them focused on obtaining struvite from wastewater, however, in CARTIF we have developed a 50L pilot crystallisation reactor, trying to solve the technical impediments presented by other technologies. This crystalliser consists of a fluidised bed reactor,i.e. the agitation of the reaction mixture is achieved in suspension, facilitation their interaction and favouring the formation and growth of the crystals. The struvite crystalliation technology we have developed has been tested in several projects in which we have participated, such as Nutri2Cycle and Nutriman (both European projects of the Horizon2020 programme), with very promising results in the crystallisation process (achieving P recovery yields of voer 90%) and good agronomic performance of the final product obtained (struvite).
Nutrient recovery process at the demonstrator on Ireland of NUTRI2CYCLE project.
Therefore, as we have seen, thanks to nutrient recovery technologies we have developed sustainable processes in which we recover waste (wastewater, digestate,etc.) following the principles of the Circular Economy and we obtain a biofertiliser of renewable origin with good agronomic performance and with characteristics that are not present in traditional fertilisers of non-renewable mineral origin (slow release). Therefore, struvite would be a good candidate to replace or reduce the use of non-renewable fertilisers.
Currently in the Circular Economy Area of CARTIF, we continue working on the development of this line of research and we are currently coordinating the WalNUT project (another European project of the Horizon2020 programme), in which together with 13 other partners from several European countries we are developing new technologies for the recovery of nutrients from wastewater (both urban and industrial). Specifically, in the case of CARTIF, we are working on a technology for N and P recovery through the cultivation of microalgae and on another technology in which nutrients are recovered through bioelectrochemical processes, i.e. Microbial Fuel Cells (MFCs).
But if you like, we´ll leave that topic for another future blog post ?
In the end, I coukd not resist…I went to see AVATAR 2. Even in 3D! The idea of recalling the sensations I experienced 13 years ago as a spectator of one of the greatest technological advances in animation of the 21st century, won over the laziness of being inside a cinema for a whopping three hours. However, this time I wanted to see how something that already caught my attention in the first film of the saga had evolved: being able to establish a direct link with nature. Amazing!
Having seen the “movie” and coming back to reality, I believe that we have never lost our link with nature but have ignored it thinking that it was no longer necessary for us and that only technological advances would make this world a better place, disregarding our natural essence. It is important to know that any measure developed to protect an ecosystem, and the biodiversity that inhabits it, will protect us as part of that biodiversity and will only improve our living conditions.
Source: Raúl Sánchez Francés
Currently there is a growing need to get in touch with nature, either due to being fed up with a sedentary and overly urban life, to practice sports or to come into contact with nature and the trees that inhabit it, but without knowing the multiple benefits that his “forest or nature bath” is providing. Although it is believed that the concept of forest bathing (Shinrin-yoku in Japanese) seems to have an ancient origin, it was not until the early 1980s when the Japanese forest authorities promoted the concept to bring people closer to the benefits of the forest. The feeling of well-being that we perceive walking through the forest has a proven scientific explanation. Already in the middle of the 20th century it was shown that certain conifers were capable of purifying/disinfecting their environment by generating a natural antibiotic (phytoncides), mainly in response to the attack they continually receive from fungi. This has a a direct consequence that the presence of trees in residential areas improves the health of its inhabitants.
Source: Raúl Sánchez Francés
There is clear evidence about the essential role that green and blue spaces play in promoting a healthier and more sustainable lifestyle. In urban and peri-urban areas, natural spaces reduce exposure to potentially harmful factors such as excessive heat, noise, and air pollution. Studies have shown that green areas surrounding urban spaces are associated with lower mortality.
Similarly, various experimental and observational studies have shown that exposure to nature is associated with improvements in cognition, brain activity, blood pressure, sleep, physical activity and mental health. Special relevance is given to the improvement of mental health (anxiety, depression and stress) due to activity in nature. An increase in well-designed, equitably distributed adn accesible green/blue spaces, as promoted by the concept of Nature-Based Solutions (NBS), is an important factor in preserving and improving mental health and well-being. The COVID-19 pandemic and the subsequent economic recession have affected the mental health of the population, with an increase un symptoms of anxiety and depressive disorders, and have highlighted the need to improve our understanding of the specific types and characteristics of nature that are key to mental health.
At CARTIF, we have been working for some time on the re-naturalization of our cities, environments and all those inhabited spaces that have lost their natural quality, with the purpose of making our cities more livable…but in a natural way and in coexsitence with nature. Projects like Urban GreenUP, MyBuildingisGreen, NATMED…are a sample of this.
Taking all this into account, the medical prescription of forest bathing, of solutions based on nature or what we have called therapies based on nature (Nature based Therapies) is getting closer.
I recently had the opportunity to talk to Odile Rodríguez de la Fuente, Félix Rodríguez de la Fuente´s daughter, about the bond with nature that her father instilled in her and her sisters and that she still maintains, from her facet as a disseminator of nature, which she performs in a fantastic way. It was undoubtely Félix who perceived the disconnect between human beings and nature at a key moment in the country´s growth, which made his work even more difficult but which has allowed him to leave a deeper and more lasting mark, laying the foundations for the sought-after link with nature.
It is about looking for real and deep connections between the human being and the natural world, which go beyond cultural work in the field or some gardening experiences such as the erroneous perception that tomato plants slowly fatten when being caressed… as if it was a test of love. Nothing could be further from the truth. When you caress a tomato plant every day, its vertical growth slows down and its stem thickens, but it is nothing more than a natural reaction to a fictitious load from the wind.
However, we still have time to protect the nature that surrounds us, to bring nature closer to our cities and living spaces, and to reconnect, to link ourselves with nature.
Many people will have an accurate idea of what biomass is and what it represents in our society. In an energy context in which energy prices are continually breaking historical records, there are already many consumers who, in view of the imminent winter, have found in biomass the solution to try to reduce their heating bills.
For several decades now we have been listening that biomass is a renewable energy resource capable of replacing fossil energy with guarantees, but with the feeling that it has not yet been able to kick down the door and take off definitively, which would change the paradigm of bioenergy in Spain once and for all.
To use an expression from cycling slang, biomass in Spain has always beien “doing the rubber”behind the leading countries (Finland, United Kingdom and Germany, among others). It is true that it has experienced sustainable growth in recent years in all the links of its value chain, but perhaps not at the pace that could be expected, taking into account the expectations created in the past.
Source: Avebiom.org
Numbers do not deceive. Although between 2014 and 2019 (pre-pandemic) the total installed biomass capacity in Spain grew by 9 %[REE], the available forestry potential is still not adequately managed. Currently, some 4.3Mt/year of forest biomass is consumed for energy uses, which represents approximately 41 % of the total available, far from the countries of northern Europe, with a long tradition of forestry, which reach levels of over 70 % [APPA].
In any case, we may think that the national bioenergy sector is already sufficiently mature. An unmistakable sign of this is the fact that, at present, practically all the national production of biofuels is consumed in Spain, due to the increase in demand for combustion equipment, and therefore fuel [AVEBIOM]. However, society in general may still find it difficult to perceive the real dimension of what biomass has to offers, and some recurring questions arise around it, such as,for example…
Biomass promotes access to a reliable and cleaner source of energy?
The use of biomass reduces CO2 emissions into the environment?
Biomass helps to combat the drama of forest fires, which destroy hundreds of thousands of hectares of land in Spain every summer?
Biomass helps to fix economic activity in the rural environment and to fight against another drama of some autonomous communities, such as depopulation?
Is Biomass cheaper than the fossil alternative? If i buy a pellet cooker, will I save on the thermal energy consumption?
Technological developments in the field of bioenergy and the current situation in the sector invite us to answer all these questions in the affirmative. Because bioenergy is environmentally neutral, and its use doesn´t contribute to global warming through CO2 emissions. Because proper forest management helps to mitigate the risk of forest fires. And because giving value to the Spanish forestry sector means boosting economic activity in rural areas, tackling the major problem of depopulation.
“Biomass in Europe is positioned as a strategic energy source to reduce our dependence on Russian gas and other forms of fossil energy”
Von der leyen. (european commission president)
But this will not be easy to achieve in the short term. At present, Spain would need to adequately manage almost 10Mt/year of dry wood in order not to depend on Russian gas, that is to say, it would have to triple its current consumption.
The present of biomass has been inevitably linked to various social, geopolitical and health events, which have had a devastating impact worldwide. In early 2020, the world was hit by the COVID-19 pandemic, which in 2021 “led to an unprecedented situation of rising commodity prices and an energy crisis due to the rising cost of energy caused by the increase in the price of fossil fuels. Furthermore, in february 2022, without having digested all of the above, Russia´s invasion of Ukraine led to a cruel war which, apart from the humanitarian drama it entailed, generated an unprecedented escalation in gas prices, introducing even more uncertainity in the supply of raw materials and energy at a global level.
As if this weren´t enough, the summer of 2022 saw an all-time record number of forest fires in Spain, devastating more than 250,000 hectares of forest and woodland ,the worst in the last 15 years [EFFIS]
However, in the words of Javier Díaz (AVEBIOM), in 2022 the biomass sector in Spain may also be remembered for facing all these difficulties and placing itself in an advantageous position to definitively overtake gas and electricity of fossil origin. The escalation of gas prices has significantly changed the current bioenergy market landscape, forcing the sector to adapt in order to cope with the high demand, both in the domestic and industrial spheres. With the fear of a possible Russian gas supply cut in the middel of winter leading to even higher prices, consumers want to switch to biomass and use it in their boilers and cookers. It is estimated that demand for wood or pellet cookers and fireplaces will increase by 20-30 %, which will be higher in the colder months. [AEFECC]
In recent years,the price stability of bioenergy has been a hallmark of its identity compared to fossil fuels, although this may currently generate some controversy, given that the price of a 15kg bag pellets has doubled in just one year, due to the generalised inflationary situation of raw materials. Some cyclical effects related to the sector do not help either, such as the real impact on the market following the application of a reduced VAT rate (5 %), in the last four months of 2022, on some solid biofuels (pellets, briquettes and firewood). Far from achieving the expected effect, unjustifies price increases have been detected by some distributors of these products, making it a wasteful measure for many consumers [OCU].
Source: AVEBIOM.
Since its creation almost 30 years ago, CARTIF has made a strong commitment to biomass as an agent of innovation, developing R&D proejcts aimed at promoting its use and improving its efficiency. Furthermore, for the last ten years we have also been biomass consumers, as one one of our three buildings currently covers its thermal demand for hot water and heating with a wood pellet boiler.
In addition, CARTIF also actively participates in the ENplus® quality scheme (certification system that regulates and control s the wood pellets sector in Europe). In 2015 we became an ENAC accredited Test Body (nº335/LE1276) for the analysis and testing of solid biofuels, being the first Spanish laboratory to achieve this.
As in so many other industrial sectors, uncertainity looms over the future of biomass in Spain, but with the certainty of being faced with a unique opportunity to overcome the barriers it has historically come up against. If companies are able to continue to hold on and take advantage of the recovery funds, biomass should now lead the change in the national energy scenario. At CARTIF we understand that this future must inevitably involve technological innovation, through energy transformation processes that are increasingly more efficient, cheaper and more environmentally sustainable.
Have you ever wondered what forests were like in the past? If suddenly a Templar travelling on horseback through a forest were to cross a rift in time and appear in the same forest today, would he notice difference? Would he see something strange? He probably would. And the fact is that the management of our forests and the relationship we establishwith them has evolved or changed over time.
“Kingdom of Heaven” frame
At the beginning of Ridley Scott´s film “Kingdom of Heaven”, there is a scene shot in the Segovian forests of Valsain. In a fight that takes place on the banks of a river, the backdrop is an almost monospecific forest of Scots pine (Pinus sylvestris). Would it be strange to find 12th century Templars in a forest of this species? Not at all. In fact, we know that it is a species widely distributed throughout the northen hemisphere over time and quite abundant. But, despite being a native species, it is not a natural forest, as the distribution of tress seems to have certain “order”.There is a relative abundance of fairly young exemplars (the trunk is not very large in diameter) growing close together, with very little space between them. Behind this distribution is the hand of man, and in a productive system such as the Montes de Valsain, trees are planted in such a way that they grow tall, straight and as quickly as possible. Furthermore, the scene takes place near a river, where we might expect a riverside forest, but instead, this type of zonal forests has been displaced to favour the growth of conifers. It is therefore a forest under forest management.
But this management isn´t something relatively current at this time in Segovia. There are, in fact, documents that accredit management policies dating back to the 16th century: in an order issued by the crown, it was specified that
“”that all the dug-up areas be levelled and that horse manure be poured in, and that all the trunks of the felled pines and oaks be uprooted and removed (…) and the resulting pits be levelled ” 1
We can say that,for several centuries, management strategies aimed at soil conservation, pest management and obtaining raw materials have been applied in certain forests in our country.
Meadows are another good example of “artificial” forest that responds to the human management throughout history. And in this case, it is even older: our most emblematic landscape, which occupies some 4 million hectares in the Iberian Peninsula, dates back to the Paleolitic2.
But it has been in more recent stages of our history that the most dramatic changes in forest management have taken place. Traditionally, the forest has been a source of wealth, food and energy for towns and cities, which in itself meant sustainable management. In many cases, need generates dependence, and dependence is what drives conservation. However, the rural exodus to the cities, the appearance of new alternative materials to the use of wood, new forms of energy, or the introduction of exotic species for industrial exploitation, led to a change in the management of forests and agricultural land, which has contributed to the deterioration of the rural landscape, the health of the forests and the lack of protection of the soil.
There came a time, therefore, when there was a need for organised forest management planning, a common strategy based on forest knowledge, the green economy and sustainability. In response to this challenge, the first forest governance bodies and tools emerged in the mid-19th century. During this period, for example, some figures were created, such as the Forestry Catalogue (1862), the First Forestry Law (1865) or the Public Forestry (1989) 3 .
Public mountain in resin in Sierra de Gata (Cáceres), image taken during the Technique Meeting celebrated in the framework of the FIREPOCTEP project the 6th september 22.
Some of these tools are still in use today. But iberian forests are facing a new challenge that is motivating the need for a major change in forest management strategies. Climate change is putting the survival of our forests to the test and calling into question the way they are managed.
Larger forest fires are becoming more frequent and virulent. The accumulation of drier fuels, vertical and horizontal continuity, and persistent low humidity and intense heat make the spread of fire intensify and render the fire inextinguishable. On the other hand, forest pests and diseases proliferate more easily in individuals weakened by heat and drought (or fire) and spread to new geographical areas due to climate change.
Fire at the national park of Bitterroot 4
And how do we face the future? We need to make changes in management and management strategies that are able to respon to the climate challenge of the present and the future. Thanks to technological advances, we have very powerful tools for data collection, modelling and prediction to bring adaptative forest management to a “virtual” level. Satellites, drones or sensors are the new working tools in the forestry engineering with which detailed and almost real-time data on the behaviour of forest can be obtained. But we also need to look back and recover traditional uses of the forest that allow us not only to protect it, but also to generate a sustainable local green economy as the forest did in the past, but with the advantage of being able to apply current technologies and knowledge.
Goats as a tool for controlling fuel in the bush and as a source of local economic resources. Image taken during the Technical Workshop held in the framework of the FIREPOCTEP project on 6 September 2022.c
To this end, it is essential to make progress in research and knowledge of forestry science and other related sciences, so that our forests endure over time and so that the forest that was the setting for historical films is not the setting for a dystopian future
At CARTIF, we work on projects that makes our forests better prepared and adapted to face a future marked by climate change. An example of this is the FIREPOCTEP project, which works to develop forest management strategies to achieve greater resilience to forest fires, while generating resources to support a local green economy. We also work on the early detection and control for emerging diseases, such as Phytophthora spp. in projects such as SUPERAand ForT-HIS.
Water is essential for human survival and well-being and plays an important role for many economic sectors. However, water resources are unevenly distributed in space and time, and are under pressure from human activity and economic development.
In addition to water for irrigation and food production which puts one of the greatest pressures on freshwater resources, industry is also a major water consumer, accounting for between 10% (Asia) and 57% (Europe) of total water consumption, either for the production of its products, and/or for the maintenance of its materials and equipment. All industrial sectors make use of water for industrial processes, ranging from those that manufacture foodstuffs to those that manufacture electronic devices.
Wastewater management is also one of the most important environmental problems facing society today, and is therefore an issue that transcends purely industrial activities, since as a vital substance, water is an ecosystem service that is transversal to most human activities, and whose traceability is heavily regulated by governmental and environmental agencies.
The possibility of reusing industrial water, regardless of whether the intention is to increase water supply or to manage nutrients in treated effluents (also a factor leading to water reuse), has positive benefits that are also the main motivators for the implementation of reuse programmes in companies.
Water Consumption in Industry – Management and Saving Plan
Industries can make better use of water, machinery, processes, services and accessories that demand large quantities of this resource that can be reduced with efficient use techniques.
For each type of industry, water is essential to satisfy different needs, and it is common to prioritise water consumption for cleaning and disinfection of products or installations and equipment. In these cleaning and disinfection tasks, the volume of water consumed varies according to the size, equipment and facilities, and the potential for savings is significant.
Therefore, water reuse should be examined from a circular economy perspective and the opportunities and risks of water reuse in the transition to a circular economy should be investigated for each type of industry.
The objectives of creating a water consumption management and saving plan in companies are:
Define methods to find out the water consumption in the facilities.
Identify strategies and points for improvement in the water consumption actions of the facilities and assess their feasibility.
To implement an effective system to reduce and control this water consumption.
Promote the participation of workers.
Water use in industry
The integral water cycle in industry
The transition to a circular economy encourages more efficient water use and, together with incentives for innovation, can improve an economy’s ability to cope with the demands of the growing imbalance between water supply and demand.
From a circular economy perspective, water reuse is a win-win option. The full cycle of wastewater management is a key component of the cycle, from source, through distribution, collection (sewerage and sanitation systems) and treatment to disposal and reuse, including water, nutrient and energy recovery. Circular economy initiatives aim to close resource loops and extend the useful life of resources and materials through longer use, reuse and remanufacturing.
The selective segregation-correction of segregated effluents from the different industrial activities (process water, cleaning, cooling, boilers, sanitary, etc.) favours the recirculation of water and the reuse of the company’s own treated water, as well as the reuse of grey water. It also minimises water consumption, reduces the final volume of water to be treated or managed and increases the efficiency of the final treatment process.
In general, water reuse requires physico-chemical treatment processes, connections, waste disposal mechanisms and other systems. The level of treatment will depend on the quality of water required for the proposed use.
The implementation of water management and water savings to be optimised is described by means of the 9 elements that make up the integral water cycle in industry:
Supply sources: distribution network, own wells, rainwater, etc.
Specific treatment depending on the quality requirements for the different types and uses of water.
Piping to the facilities.
Uses in the process (supply to product, reaction medium, dilution, etc.) and auxiliary activities (cooling towers, steam boilers, cleaning of equipment and facilities).
Effluent drainage.
Recirculation.
Purification (own or external WWTP).
Internal reuse.
Discharge of wastewater, quality requirement limited by the competent environmental authority.
Water consumption in industry can be rationalised and minimised through various improvements in the production process and auxiliary activities, taking as a reference the application of BATs (Best Available Techniques in relation to integrated environmental authorisations in industrial activities).
As a rule, general actions concern the modification of open cooling circuits into closed ones, the avoidance of losses in steam systems, the improvement of inlet water conditioning systems and production means, and the optimisation of cleaning operations of equipment and installations.
Recirculation is considered if water treatment is not necessary or is very simple, as it involves the successive use of a flow of water in the same process, consuming a small percentage of flow renewal in each cycle.
Internal reuse is the use of water already used in the industry itself, treated by a specific treatment, for other uses that are less demanding in terms of quality or sensitivity.
Non-conventional resources such, as rainwater harvesting, are an easy way to obtain water and do not require purification, but depends on the amount of precipitation in each location. It offers advantages such as high physico-chemical water quality without the need for purification and a simple infrastructure.
The reuse of greywater from showers and toilets with a low level of contamination can be treated into clean, non-potable water.
Operational methodology for optimising water consumption and management
The procedure is summarised as follows:
STEP 1
Data collection and analysis. Request for previous documentation and data necessary for the evaluation of water management.
STEP 2
Visit to the company to recognise “in situ” the corresponding characteristics of the production processes developed, as well as the use of water in the plant.
STEP 3
General description of the production processes and auxiliary activities, identifying the different operations: process line, water line, treatment lines and auxiliary activities (refrigeration, steam boiler, cleaning of equipment and containers and storage).
Diagram/plan of water use in the company.
Substances involved, raw materials, reagents, by-products.
Inventory and description of ancillary activities.
Inventory, origin, handling and destination of effluents, wastes and emissions.
STEP 4
Report writing:
Diagnosis of minimisation of water consumption and proposal for improvement.
Prioritisation of actions according to their performance.
Essentially, the fundamental strategy for the optimisation of water management is the global characterisation of water use, the application of selective segregation-correction of process effluents and the analysis of the possible recovery and utilisation of these effluents.
Optimising water management in industry can achieve savings of 40-50%. This can reduce costs and protect natural resources. Companies should be aware that this increases the social prestige of the company with an economic benefit and promotes sustainability.
On June 5th, and as all the years since 1974, is celebrated the World Environment Day. Annually, a theme is choosen to conmemorate this day, in 2022 the choosen one has been “Only One Earth”, slogan shared by the Stockholm Conference of 1972 where the United Nations Environment Programme was created (PNUMA).
REsearching all these information, I´ve stopped at the slogan of the past year, not only because of the theme but because I like words games. In 2021 the known 3R of the recycling were modified (REduce, REuse and REcicle) for making the slogan of the Environment 3R “REIMAGINE, RECOVER, RESTORE”
These 3 words are totally aligned with our daily work but what it seems to me more important, because of the difficulty involved, is the “R” of restore…
When we listen that a space needs to be restore, we tend to think in an abandoned mine, a landfill or any space that is desolated and in which we have to plant a handful of trees to make it again pleasing to the eye.
The truth is that ecosystems recover of all the alterations in a natural way, regardless of whether or not the hand of man has intervened, and even some of these changes are temporal or cyclic natural modifications. Then, when we have to act? The answer is easy, when the ecological balance that allows ecosystems to mature and maximise the services and benefits produced has been broken .
If we really stop to think in the spaces that we degradate or the ecosystems we break we will realise that behind our every steps there would have to be an environment restoration project.
For example, what occurs when we construct a road? We divide a landscape, but well, what is a line in the infinity of the castillian land? Seen like that, nor is it… However, what involvement could this line have in our ecosystem? From the point of view of biodiversity, the effects could be devastators. On which side of the road have animals stayed? And where have food stayed? And water? And shelter areas? And if we have divided a herd?
Environmental restoration projects aim to restore the environment to its original state, but this doesn´t mean that roads can´t be built or wind farms put up or a mine exploited. Environmental projects disrupt habitats for imitate the structure, function, diversity and dynamic that has the original ecosystem including also the visual integration of new elements of the landscape.
Source: www.totenart.com
As well as the restoration of work of arts, we have to take into account several factors if we don´t want that our environmental restoration projects end up being as famous as Borja´s Ecce Homo, do you remember?
For the final result to be as expected, it should be very well planified, because this is the most important and decisive stage of the restoration, and should be addressed from an integrator and multidisciplinar point of view. Ecosystems are complex system in which infinity of variables intervene, therefore the planification must be confronted from all the available perspectives: ecology, zoology, botanics, geology, hydrology , engineer…
Once realized the diagnosis of the area, studied the ecosystem , stablished the objectives that wants to reach and the focus that is going to give, should be defined the technique solutions and evaluate the viability of each one, for later design and execute it.
If we continue with the previous example, for the right execution of huge lineal infrastructures , it should have take into account the ecosystem partitioning, and part of its restoration goes through realize wildlife crossings, that not only avoid traffic accidents for collision with animals or track exists, but allows giving those continuity to the fragmented habitat and avoid the loss of associated biodiversity. Design of wildlife crossing, lower or in height, must be made adapting to the infrastructures in accordance with the existing species of the area, as the needs fot he amphibians would be totally differnt that the needs of small mammals or the ones of big mammals.
Lower wildlife crossings, can be built taking advantage and adapting drainage structures, making them more wide and luminous to avoid tunnel efect, and revegetating entries for favouring the approach of animals but do not obstruct dreinage.
Wildilife crossings adapted to elephants Source: www.paisajeo.org Railway wildlife crossings adapted to turttles Source: www.pasiajeo.org
Superior wildlife crossings, in general we know them better, although probably we haven´t noticed them and we think that they are simple bridges or tunnels over our roads. The design of infrastructures has its own technique specifications of wide, acoustic and light insulation, height of side barriers, but also about vegetal and edaphic coverage and access shape for the animals to have a broad view of output and do not perceive they are crossing a high risk area for them.
If 50 years after the creation of PNUMA we can reuse the same slogan, isn´t because we take the 3R´s of recycling to the extreme, but because we should learnt of our mistakes and restored so that this time yes or yes, let us be “ONLY ONE EARTH” #OnlyOneEarth #WorldEnvironmentDay
