Your search found 21 records
1 Rao, Krishna C.; Kvarnstrom, E.; Di Mario, L.; Drechsel, Pay. 2016. Business models for fecal sludge management. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE). 80p. (Resource Recovery and Reuse Series 06) [doi: https://doi.org/10.5337/2016.213]
Faecal sludge ; Resource management ; Resource recovery ; Recycling ; Business management ; Models ; Waste disposal ; Desludging ; Dumping ; Sewerage ; Waste treatment ; Waste water treatment plants ; Solid wastes ; Pollution ; Composts ; Public health ; Sanitation ; Latrines ; Defaecation ; Stakeholders ; Finance ; Cost recovery ; Energy recovery ; Biogas ; Organic fertilizers ; Private enterprises ; Institutions ; Partnerships ; Licences ; Regulations ; Transport ; Septic tanks ; Nutrients ; Taxes ; Farmers ; Urban areas ; Landscape ; Household ; Incentives ; Case studies / Asia / Africa / Latin America / South Africa / Kenya / India / Rwanda / Nepal / Philippines / Lesotho / Bangladesh / Mozambique / Ghana / Senegal / Benin / Sierra Leone / Malaysia / Ethiopia / Vietnam / Mali / Sri Lanka / Burkina Faso / Peru / Haiti / Dakar / Nairobi / Maseru / Accra / Tamale / Addis Ababa / Eastern Cape / Maputo / Dhaka / Ho Chi Minh City / Hai Phong / Dumaguete / Mombasa / Kisumu / San Fernando / Bamako / Cotonou / Ouagadougou / Kigali / Bangalore / Dharwad / Balangoda
(Location: IWMI HQ Call no: IWMI Record No: H047826)
(4.75 MB)
On-site sanitation systems, such as septic tanks and pit latrines, are the predominant feature across rural and urban areas in most developing countries. However, their management is one of the most neglected sanitation challenges. While under the Millennium Development Goals (MDGs), the set-up of toilet systems received the most attention, business models for the sanitation service chain, including pit desludging, sludge transport, treatment and disposal or resource recovery, are only emerging. Based on the analysis of over 40 fecal sludge management (FSM) cases from Asia, Africa and Latin America, this report shows opportunities as well as bottlenecks that FSM is facing from an institutional and entrepreneurial perspective.
2 Drechsel, Pay; Otoo, Miriam; Paul, Johannes. (Eds.) 2017. Resource recovery from waste for agriculture, landscaping and aquaculture. Resources, 6(3):12, 19, 26, 30, 31(Special issue with contributions by IWMI authors).
Resource recovery ; Agricultural wastes ; Landscape ; Aquaculture ; Cost recovery ; Food wastes ; Business management ; Feasibility studies ; Phosphorus ; Energy recovery ; Composts ; Wastewater treatment ; Water reuse
(Location: IWMI HQ Call no: e-copy only Record No: H048218)
http://www.mdpi.com/journal/resources/special_issues/landscaping_aquaculture
https://vlibrary.iwmi.org/pdf/H048218_TOC.pdf
https://vlibrary.iwmi.org/pdf/H048218_TOC.pdf
3 Fernando, B. S. R.; Ranasinghe, R. A. C. P.; Punchihewa, H. K. G. 2017. Organic rankine cycle (ORC): performance of working fluids and energy recovery potential in Sri Lankan thermal power plants. In Sri Lanka. The Institution of Engineers. Transactions of the Institution of Engineers Sri Lanka. Technical Papers (Part B). Colombo, Sri Lanka: The Institution of Engineers. pp.151-159.
Energy recovery ; Fluids ; Thermal energy ; Organic compounds ; Decane ; Heptane ; Pentane ; Temperature ; Economic analysis ; Investment / Sri Lanka
(Location: IWMI HQ Call no: e-copy only Record No: H048498)
ORC based power generation is becoming popular as a way of generating electricity from low-grade heat sources such waste heat. Working fluid selection and system optimization based on heat source temperature are two critical aspects of ORC design. In this work, eleven fluids comprised of hydrocarbons and refrigerants were theoretically investigated to maximize the work output for a range of source temperatures. Results show that Heptane, Pentane and Decane show favourable results in terms of work outputs while, in terms of efficiency, Decane and Heptane are better. Further, it was found that Pentane outperforms, when source temperatures are between 45 – 190 0C, while Heptane for 190 – 260 0C. Decane is more suitable for 260 – 340 0C range. Based on the theoretical analysis, a new summarized graphical chart was developed for Pentane, Heptane and Decane, where one point on the graph can denote approximate work output, efficiency, pressure, temperature and other required data for the initial design process and fluid selection of an ORC plant. Subsequently, the economic feasibility of ORC was assessed considering WH data of all the thermal plants of in Sri Lanka. Possible electric power outputs were computed for each selected plant, for selected fluids from the above theoretical analysis. Then, maximum work out of each case was selected for further economic evaluation under seven different scenarios, which represents the future economic situation in the country. Investment cost was estimated pertaining to the maximum work output and payback time was estimated to evaluate the investment feasibility. Interestingly, results show that some of the high volume power stations are very good candidate for ORC, which has very short payback time even with the worst possible economic situations considered.
4 Otoo, Miriam; Gebrezgabher, Solomie; Drechsel, Pay; Rao, Krishna C.; Fernando, Sudarshana; Pradhan, S. K.; Hanjra, Munir A.; Qadir, M.; Winkler, M. 2018. Defining and analyzing RRR business cases and models. In Otoo, Miriam; Drechsel, Pay (Eds.). Resource recovery from waste: business models for energy, nutrient and water reuse in low- and middle-income countries. Oxon, UK: Routledge - Earthscan. pp.17-31.
Resource recovery ; Business management ; Models ; Case studies ; Assessment ; Waste management ; Wastewater treatment ; Financing ; Water reuse ; Nutrients ; Organic matter ; Energy recovery ; Private sector ; Public sector ; Cost recovery ; Risk reduction ; Health hazards ; Environmental impact assessment
(Location: IWMI HQ Call no: IWMI Record No: H048624)
(0.99 MB)
5 Rao, Krishna C.; Gebrezgabher, Solomie. (Eds.) 2018. Energy recovery from organic waste - Section II. In Otoo, Miriam; Drechsel, Pay (Eds.). Resource recovery from waste: business models for energy, nutrient and water reuse in low- and middle-income countries. Oxon, UK: Routledge - Earthscan. pp.34-313.
Energy recovery ; Energy generation ; Fuels ; Organic wastes ; Resource recovery ; Business management ; Models ; Briquettes ; Agricultural wastes ; Case studies ; Fuelwood ; Charcoal ; Biogas ; Bagasse ; Renewable energy ; Eenergy conservation ; Supply chain ; Socioeconomic environment ; Environmental impact ; Municipal wastes ; Solid wastes ; Public-private cooperation ; Partnerships ; Economic aspects ; Risk reduction ; Faecal sludge ; Food wastes ; Organic fertilizers ; Electrification ; Swine ; Abattoirs ; Industrial wastes ; Carbon credits ; Rice husks ; Rural areas ; Local authorities ; Ethanol ; Sugar industry ; Cassava / Uganda / Rwanda / India / Kenya / Peru / Brazil / Mexico / Thailand / Venezuela / Kampala / Kigali / Nairobi / Bihar / Maharashtra / Pune / Mumias / Dagoretti / Bangkok / Carabobo
(Location: IWMI HQ Call no: IWMI Record No: H048625)
(10.3 MB)
6 Rao, Krishna C.; Gebrezgabher, Solomie. 2018. Recovering energy from waste: an overview of presented business cases and models. In Otoo, Miriam; Drechsel, Pay (Eds.). Resource recovery from waste: business models for energy, nutrient and water reuse in low- and middle-income countries. Oxon, UK: Routledge - Earthscan. pp.34-37.
Energy recovery ; Energy generation ; Resource recovery ; Business models ; Sustainable development ; Case studies
(Location: IWMI HQ Call no: IWMI Record No: H048726)
(792 KB)
7 Global Water Intelligence (GWI). 2012. Sludge management: opportunities in growing volumes, disposal restrictions and energy recovery. Oxford, UK: Media Analytics Ltd. 296p.
Waste management ; Sludge treatment ; Waste disposal ; Resource recovery ; Energy recovery ; Industrial wastes ; Urban wastes ; Regulations ; Frameworks ; European Union ; Waste water treatment plants ; Technology ; Strategies ; Dewatering ; Anaerobic digestion ; Drying ; Thermal energy ; Pollutants ; Chemical reactions ; Biogas ; Nutrients ; Landfills ; Agricultural sector ; Market access ; Market research ; Market segmentation ; Costs ; Public opinion ; Case studies / North America / Europe / Middle East / North Africa / USA / Canada / China / Brazil / Japan
(Location: IWMI HQ Call no: 628.364 G000 GLO, e-copy SF Record No: H048869)
(1.08 MB)
8 Mendum, R.; Njenga, M. 2018. Gender and energy and the rationale for resource recovery and reuse (RRR) for energy. In Njenga, M.; Mendum, R. (Eds.). Recovering bioenergy in Sub-Saharan Africa: gender dimensions, lessons and challenges. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE). pp.1-4. (Resource Recovery and Reuse: Special Issue)
Gender ; Resource recovery ; Reuse ; Energy recovery ; Energy generation ; Energy consumption ; Fuels ; Cooking ; Heating
(Location: IWMI HQ Call no: e-copy only Record No: H049002)
(337 KB)
9 Mendum, R.; Njenga, M. 2018. Take-home messages on gender and resource recovery and reuse (RRR) for energy. In Njenga, M.; Mendum, R. (Eds.). Recovering bioenergy in Sub-Saharan Africa: gender dimensions, lessons and challenges. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE). pp.81-82. (Resource Recovery and Reuse: Special Issue)
Resource recovery ; Reuse ; Gender ; Energy recovery ; Energy resources ; Organic wastes ; Cooking ; Heating ; Women's participation ; Fuels ; Informal settlements ; Business management ; Case studies
(Location: IWMI HQ Call no: e-copy only Record No: H049010)
(639 KB)
10 Lazurko, Anita; Drechsel, Pay; Hanjra, M. A. 2018. Financing resource recovery and reuse in developing and emerging economies: enabling environment, financing sources and cost recovery. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE) 39p. (Resource Recovery and Reuse Series 11) [doi: https://doi.org/10.5337/2018.220]
Resource recovery ; Resource management ; Water reuse ; Economic development ; Financing ; Cost recovery ; Investment ; Incentives ; Market economies ; Credit policies ; Developing countries ; Development policies ; Regulations ; Stakeholders ; Funding ; Loans ; Grants ; Agreements ; Risk management ; Public-private cooperation ; Partnerships ; Value chain ; Carbon markets ; Payment for ecosystem services ; State intervention ; Cost benefit analysis ; Environmental management ; Waste management ; Water management ; Equity ; Communities ; Energy recovery
(Location: IWMI HQ Call no: IWMI Record No: H049025)
(979 KB)
Resource recovery and reuse (RRR) of domestic and agro-industrial waste has the potential to contribute to a number of financial, socioeconomic and environmental benefits. However, despite these benefits and an increasing political will, there remain significant barriers to build the required up-front capital which is discouraging private sector engagement. A systematic analysis and understanding of the enabling environment, public and private funding sources, risk-sharing mechanisms and pathways for cost recovery can help to identify opportunities to improve the viability of RRR solutions. This report looks at regulations and policies that remove disincentives for RRR, public and private funding sources for capital and operational costs, risk mitigation options through blending and structuring finance, and options for operational cost recovery.
11 Andriessen, N.; Ward, B. J.; Strande, L. 2019. To char or not to char?: review of technologies to produce solid fuels for resource recovery from faecal sludge. Journal of Water, Sanitation and Hygiene for Development, 9(2):210-224. [doi: https://doi.org/10.2166/washdev.2019.184]
Resource recovery ; Solid fuels ; Faecal sludge ; Technology assessment ; Resource management ; Energy recovery ; Pellets ; Pyrolysis ; Sanitation
(Location: IWMI HQ Call no: e-copy only Record No: H049304)
https://iwaponline.com/washdev/article-pdf/9/2/210/583217/washdev0090210.pdf
https://vlibrary.iwmi.org/pdf/H049304.pdf
https://vlibrary.iwmi.org/pdf/H049304.pdf
(0.57 MB) (580 KB)
Resource recovery from faecal sludge can take many forms, including as a fuel, soil amendment, building material, protein, animal fodder, and water for irrigation. Resource recovery as a solid fuel has been found to have high market potential in Sub-Saharan Africa. Laboratory- and pilot-scale research on faecal sludge solid fuel production exists, but it is unclear which technology option is most suitable in which conditions. This review offers an overview and critical analysis of the current state of technologies that can produce a dried or carbonized solid fuel, including drying, pelletizing, hydrothermal carbonization, and slow-pyrolysis. Carbonization alters fuel properties, and in faecal sludge, it concentrates the ash content and decreases the calorific value. Overall, a non-carbonized faecal sludge fuel is recommended, unless a carbonized product is specifically required by the combustion technology or end user. Carbonized and non-carbonized fuels have distinct characteristics, and deciding whether to char or not to char is a key judgement in determining the optimal solid fuel technology option. Based on the existing evidence, this review provides a decision-making structure for selecting the optimal technology to produce a faecal sludge solid fuel and identifies the top research needs prior to full-scale implementation.
12 Qadir, M.; Drechsel, Pay; Cisneros, B. J.; Kim, Y.; Pramanik, A.; Mehta, P.; Olaniyan, O. 2020. Global and regional potential of wastewater as a water, nutrient and energy source. Natural Resources Forum, 44(1):40-51. [doi: https://doi.org/10.1111/1477-8947.12187]
Wastewater treatment ; Recycling ; Resource recovery ; Reuse ; Nutrients ; Energy sources ; Nitrogen ; Phosphorus ; Potassium ; Fertilizers ; Wastewater irrigation ; Energy generation ; Energy recovery ; Forecasting ; Municipal wastewater ; Sustainable Development Goals ; Urban population ; Water stress / Asia / Africa South of Sahara / Middle East / North Africa / Europe / Latin America / Caribbean / North America / Oceania
(Location: IWMI HQ Call no: e-copy only Record No: H049500)
https://onlinelibrary.wiley.com/doi/epdf/10.1111/1477-8947.12187
https://vlibrary.iwmi.org/pdf/H049500.pdf
https://vlibrary.iwmi.org/pdf/H049500.pdf
(1.44 MB)
There is a proactive interest in recovering water, nutrients and energy from waste streams with the increase in municipal wastewater volumes and innovations in resource recovery. Based on the synthesis of wastewater data, this study provides insights into the global and regional “potential” of wastewater as water, nutrient and energy sources while acknowledging the limitations of current resource recovery opportunities and promoting efforts to fast-track highefficiency returns. The study estimates suggest that, currently, 380 billion m3 (m3 = 1,000 L) of wastewater are produced annually across the world which is a volume fivefold the volume of water passing through Niagara Falls annually. Wastewater production globally is expected to increase by 24% by 2030 and 51% by 2050 over the current level. Among major nutrients, 16.6 Tg (Tg = million metric ton) of nitrogen are embedded in wastewater produced worldwide annually; phosphorus stands at 3.0 Tg and potassium at 6.3 Tg. The full nutrient recovery from wastewater would offset 13.4% of the global demand for these nutrients in agriculture. Beyond nutrient recovery and economic gains, there are critical environmental benefits, such as minimizing eutrophication. At the energy front, the energy embedded in wastewater would be enough to provide electricity to 158 million households. These estimates and projections are based on the maximum theoretical amounts of water, nutrients and energy that exist in the reported municipal wastewater produced worldwide annually. Supporting resource recovery from wastewater will need a step-wise approach to address a range of constraints to deliver a high rate of return in direct support of Sustainable Development Goals (SDG) 6, 7 and 12, but also other Goals, including adaptation to climate change and efforts in advancing “netzero” energy processes towards a green economy.
13 Kehrein, P.; van Loosdrecht, M.; Osseweijer, P.; Garfí, M.; Dewulf, J.; Posada, J. 2020. A critical review of resource recovery from municipal wastewater treatment plants - market supply potentials, technologies and bottlenecks. Environmental Science: Water Research and Technology, 6(4):877-910. [doi: https://doi.org/10.1039/C9EW00905A]
Municipal wastewater ; Resource recovery ; Wastewater treatment plants ; Technology ; Water reuse ; Health hazards ; Fertilizers ; Membrane filtration ; Oxidation ; Sewage sludge ; Waste incineration ; Cellulose ; Energy recovery ; Methane ; Biogas ; Thermal energy ; Nutrients ; Markets ; Policies / Netherlands / Belgium / Flanders
(Location: IWMI HQ Call no: e-copy only Record No: H049692)
https://pubs.rsc.org/en/content/articlepdf/2020/ew/c9ew00905a
https://vlibrary.iwmi.org/pdf/H049692.pdf
https://vlibrary.iwmi.org/pdf/H049692.pdf
(2.11 MB) (2.11 MB)
In recent decades, academia has elaborated a wide range of technological solutions to recover water, energy, fertiliser and other products from municipal wastewater treatment plants. Drivers for this work range from low resource recovery potential and cost effectiveness, to the high energy demands and large environmental footprints of current treatment-plant designs. However, only a few technologies have been implemented and a shift from wastewater treatment plants towards water resource facilities still seems far away. This critical review aims to inform decision-makers in water management utilities about the vast technical possibilities and market supply potentials, as well as the bottlenecks, related to the design or redesign of a municipal wastewater treatment process from a resource recovery perspective. Information and data have been extracted from literature to provide a holistic overview of this growing research field. First, reviewed data is used to calculate the potential of 11 resources recoverable from municipal wastewater treatment plants to supply national resource consumption. Depending on the resource, the supply potential may vary greatly. Second, resource recovery technologies investigated in academia are reviewed comprehensively and critically. The third section of the review identifies nine non-technical bottlenecks mentioned in literature that have to be overcome to successfully implement these technologies into wastewater treatment process designs. The bottlenecks are related to economics and value chain development, environment and health, and society and policy issues. Considering market potentials, technological innovations, and addressing potential bottlenecks early in the planning and process design phase, may facilitate the design and integration of water resource facilities and contribute to more circular urban water management practices.
14 Rao, Krishna C.; Velidandla, S.; Scott, C. L.; Drechsel, Pay. 2020. Business models for fecal sludge management in India. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE). 199p. (Resource Recovery and Reuse Series 18: Special Issue) [doi: https://doi.org/10.5337/2020.209]
Resource recovery ; Resource management ; Reuse ; Faecal sludge ; Waste management ; Business models ; Value chains ; Waste treatment ; Desludging ; Sanitation ; Hygiene ; Sustainable Development Goals ; Solid wastes ; Septic tanks ; Toilets ; Waste disposal ; Transport ; Treatment plants ; Urban areas ; Public-private partnerships ; Stakeholders ; Nongovernmental organizations ; Financial viability ; Funding ; Marketing ; Pricing ; Investment ; Operating costs ; Cost recovery ; Benefits ; Profitability ; Risk ; Technology ; Government procurement ; Taxes ; Energy recovery ; Nutrients ; Biogas ; Composting ; Households ; Case studies / India / Tamil Nadu / Gujarat / Telangana / Bihar / Kerala / Maharashtra / Rajasthan / Delhi / Uttar Pradesh / Odisha / Jammu and Kashmir / Karnataka / West Bengal / Panaji / Goa / Chennai
(Location: IWMI HQ Call no: IWMI Record No: H050010)
(9.13 MB)
Globally, 50% of the population relies on on-site sanitation systems (OSS) such as septic tanks and pit latrines and is, hence, in need of Fecal Sludge Management (FSM) solutions. India is a classic example, given that its government built more than 100 million toilets with the majority relying on OSS. With 400 fecal sludge treatment plants (FSTPs) in various stages of planning, procurement and construction, this report comes at an opportune time to present findings on FSM business models already implemented across India.
Interviews were conducted with a total of 105 Emptying and Transport (E&T) operators in 72 towns and cities across 16 states in India, 22 representatives from municipalities that own emptying vehicles, 18 FSTP operators and more than 30 institutions. In addition, procurement tenders for E&T and FSTPs in 13 states were analyzed.
In total, 18 business models were identified, several with energy or nutrient recovery components. The analysis of E&T operators revealed clear differences that steer a business towards success or failure. The majority of operators still dispose fecal sludge in an unsafe manner, due to the lack of official disposal or treatment sites. In comparison to sewer networks, the capital and operating costs (per capita) of FSTPs were significantly lower. The report provides evidence-based discussions on policies and recommendations for scaling and sustaining FSM.
Interviews were conducted with a total of 105 Emptying and Transport (E&T) operators in 72 towns and cities across 16 states in India, 22 representatives from municipalities that own emptying vehicles, 18 FSTP operators and more than 30 institutions. In addition, procurement tenders for E&T and FSTPs in 13 states were analyzed.
In total, 18 business models were identified, several with energy or nutrient recovery components. The analysis of E&T operators revealed clear differences that steer a business towards success or failure. The majority of operators still dispose fecal sludge in an unsafe manner, due to the lack of official disposal or treatment sites. In comparison to sewer networks, the capital and operating costs (per capita) of FSTPs were significantly lower. The report provides evidence-based discussions on policies and recommendations for scaling and sustaining FSM.
15 Nikiema, Josiane; Mateo-Sagasta, Javier; Asiedu, Zipporah; Saad, Dalia; Lamizana, B. 2020. Water pollution by plastics and microplastics: a review of technical solutions from source to sea. Nairobi, Kenya: United Nations Environment Programme (UNEP). 112p.
Water pollution ; Plastics ; Microplastics ; Waste management ; Sea pollution ; Freshwater pollution ; Contamination ; Water quality ; Wastewater treatment ; Treatment plants ; Recycling ; Technology ; Drinking water treatment ; Industrial wastewater ; Costs ; Municipal wastewater ; Solid wastes ; Sewage sludge ; Landfill leachates ; Waste incineration ; Risk ; Public health ; Health hazards ; Developing countries ; Policies ; Energy recovery ; Wetlands / USA / Europe / China
(Location: IWMI HQ Call no: e-copy only Record No: H050126)
https://wedocs.unep.org/bitstream/handle/20.500.11822/34424/WPMM.pdf?sequence=4&isAllowed=y
https://vlibrary.iwmi.org/pdf/H050126.pdf
https://vlibrary.iwmi.org/pdf/H050126.pdf
(2.63 MB) (26.6 MB)
16 Senanayake, Dehaja; Reitemeier, Maren; Thiel, Felix; Drechsel, Pay. 2021. Business models for urban food waste prevention, redistribution, recovery and recycling. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE). 85p. (Resource Recovery and Reuse Series 19) [doi: https://doi.org/10.5337/2021.208]
Resource recovery ; Resource management ; Reuse ; Food wastes ; Business models ; Waste management ; Urban wastes ; Waste reduction ; Redistribution ; Recycling ; Food consumption ; Food losses ; Waste collection ; Food supply chains ; Stakeholders ; Entrepreneurs ; Public-private partnerships ; Markets ; Incentives ; Energy recovery ; Nutrients ; Sustainable Development Goals ; Goal 12 Responsible production and consumption ; Environmental impact ; Food preservation ; Composting ; Feeds ; Regulations ; Policies ; Awareness raising ; Consumer participation ; Costs
(Location: IWMI HQ Call no: IWMI Record No: H050448)
(5.48 MB)
A necessary extension of the concept of Resource Recovery and Reuse with an even higher priority is the prevention and reduction of waste. One concern, in particular, is food waste, which constitutes the largest share of human waste. Target 12.3 of the United Nations Sustainable Development Goals (SDGs) is to ‘halve per capita global food waste at the retail and consumer levels and reduce food losses along production and supply chains, including post-harvest losses, by 2030’. For this report, over 400 businesses were analyzed to identify common approaches and business models to address the food waste challenge. The business models are presented under seven categories – measurement, redistribution, resell, value addition, responsible waste collection, resource recovery, and recycling – with a special focus on their application potential to the Global South.
17 Selihin, N. M.; Tay, M. G. 2022. A review on future wastewater treatment technologies: micro-nanobubbles, hybrid electro-fenton processes, photocatalytic fuel cells, and microbial fuel cells. Water Science and Technology, 85(1):319-341. [doi: https://doi.org/10.2166/wst.2021.618]
Wastewater treatment ; Technology ; Hybridization ; Chemical treatment ; Electrolysis ; Oxidation ; Microbial fuel cells ; Sustainability ; Energy recovery ; Pollutants
(Location: IWMI HQ Call no: e-copy only Record No: H050885)
https://iwaponline.com/wst/article-pdf/85/1/319/985995/wst085010319.pdf
https://vlibrary.iwmi.org/pdf/H050885.pdf
https://vlibrary.iwmi.org/pdf/H050885.pdf
(0.66 MB) (672 KB)
The future prospect in wastewater treatment technologies mostly emphasizes processing efficiency and the economic benefits. Undeniably, the use of advanced oxidation processes in physical and chemical treatments has played a vital role in helping the technologies to remove the organic pollutants efficiently and reduce the energy consumption or even harvesting the electrons movements in the oxidation process to produce electrical energy. In the present paper, we review several types of wastewater treatment technologies, namely micro-nanobubbles, hybrid electro-Fenton processes, photocatalytic fuel cells, and microbial fuel cells. The aims are to explore the interaction of hydroxyl radicals with pollutants using these wastewater technologies, including their removal efficiencies, optimal conditions, reactor setup, and energy generation. Despite these technologies recording high removal efficiency of organic pollutants, the selection of the technologies is dependent on the characteristics of the wastewater and the daily production volume. Hence the review paper also provides comparisons between technologies as the guidance in technology selection.
18 Behera, B.; Selvam, S. M.; Balasubramanian, P. 2022. Hydrothermal processing of microalgal biomass: circular bio-economy perspectives for addressing food-water-energy nexus. Bioresource Technology, 359:127443. [doi: https://doi.org/10.1016/j.biortech.2022.127443]
Biomass ; Hydrothermal activity ; Circular economy ; Bioeconomy ; Foods ; Water ; Energy recovery ; Nexus approaches ; Thermochemical processes ; Technology ; Sustainability ; Biochemical processes ; Environmental impact ; Wastewater treatment ; Feedstocks ; Biofuels ; Greenhouse gas emissions
(Location: IWMI HQ Call no: e-copy only Record No: H051331)
(1.95 MB)
Hydrothermal processing of microalgae is regarded as a promising technology to generate multitude of energy based and value-added products. The niche of hydrothermal technologies is still under infancy in terms of the technical discrepancies related to research and development. Thus, the present review critically surveyed the recent advancements linked to the influencing factors governing the algal hydrothermal processing in terms of the product yield and quality. The sustainability of hydrothermal technologies as a standalone method and in broader aspects of circular bio-based economy for energy and value-added platform chemicals are comprehensively discussed. Process optimization and strategic integration of technologies has been suggested to improve efficiency, with reduced energy usage and environmental impacts for addressing the energy-food-water supply chains. Within the wider economic transition and sustainability debate, the knowledge gaps identified and the research hotspots fostering future perspective solutions proposed herewith would facilitate its real-time implementation.
19 Samberger, C. 2022. The role of water circularity in the food-water-energy nexus and climate change mitigation. Energy Nexus, 6:100061. [doi: https://doi.org/10.1016/j.nexus.2022.100061]
Foods ; Water footprint ; Energy generation ; Nexus approaches ; Climate change mitigation ; Circular economy ; Sustainability ; Renewable energy ; Energy recovery ; Sustainable Development Goals ; Water use ; Water treatment ; Carbon footprint ; Freshwater ; Population ; Wastewater treatment plants ; Sewage
(Location: IWMI HQ Call no: e-copy only Record No: H051361)
https://www.sciencedirect.com/science/article/pii/S2772427122000249/pdfft?md5=95703584a27d4c6fc5c7ad5230256bc3&pid=1-s2.0-S2772427122000249-main.pdf
https://vlibrary.iwmi.org/pdf/H051361.pdf
https://vlibrary.iwmi.org/pdf/H051361.pdf
(2.39 MB) (2.39 MB)
By 2050, the global Earth population will reach 10 billion, leading to increased water, food, and energy needs. Availability of water in sufficient quantities and appropriate quality is a prerequisite for human societies and natural ecosystems. In many parts of the world, excessive water consumption and pollution by human activities put enormous pressure on this availability as well as on food and energy security, environmental quality, economic development, and social well-being. Water, food/materials, and energy are strongly interlinked, and the choices made in one area often have consequences on the others. This is commonly referred to as the “water-food-energy” nexus. These interconnections intensify as the demand for resources increases with population growth and changing consumption patterns, and Humanity continues using a linear economy model of ‘take-make-dispose’. The nexus makes it difficult for governments, public and private organizations, and the public, to set and follow a clear path towards a sustainable economy i.e., “meeting the needs of the present without compromising the ability of future generations to meet their own needs”. Humanity best chance at mitigating climate change, and shortage of resources is to harness the value of water as much as possible.
This paper reviews the latest publications about the water-food-energy nexus and climate change, putting numbers into perspective, attempting to explain why water circularity is part of the key factors to accelerate the transition from a linear economy to a circular economy, and to meet the UN Sustainable Development Goals, and how circularity can be implemented in the water sector.
This paper reviews the latest publications about the water-food-energy nexus and climate change, putting numbers into perspective, attempting to explain why water circularity is part of the key factors to accelerate the transition from a linear economy to a circular economy, and to meet the UN Sustainable Development Goals, and how circularity can be implemented in the water sector.
20 Gebrezgabher, Solomie; Taron, Avinandan; Odero, J.; Sanfo, S.; Ouedraogo, Ramata; Salack, S.; Diarra, K.; Ouedraogo, S.; Ojungobi, K. 2022. Circular bioeconomy business models - energy recovery from agricultural waste: cases from Kenya and Burkina Faso. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Initiative on Nature-Positive Solutions. 37p.
Circular economy ; Bioeconomy ; Business models ; Energy recovery ; Agricultural wastes ; Biogas ; Fertilizers ; Resource recovery ; Waste management ; Public-private partnerships ; Markets ; Value chains ; Technology ; Financial analysis ; Environmental impact ; Health hazards ; Case studies / Kenya / Burkina Faso
(Location: IWMI HQ Call no: e-copy only Record No: H051646)
(1.14 MB)
Agricultural waste can be widely adopted to manufacture biogas or biofuel, which is obtained from biomass or agricultural wastes like molasses, bagasse slurries manure etc. Agricultural waste is mostly burned or left decomposing on the fields, where it has potential for polluting the environment and release greenhouse gases. Recovering energy helps to (i) reduce greenhouse emissions by reducing environmental pollution from unwanted biomasses otherwise being burnt in the field; (ii) improve energy efficiency in heating systems from renewable energy sources; (iii) introduce renewable energy by substituting carbon neutral biomass for hydro-carbons (coal, heavy oil and gas); and (iv) Recycle ash residues or slurry as a fertilizer.
The present report covers four case studies from Kenya and Burkina Faso related to recovering energy from agrowaste. Biogas International Limited (BIL) is a public private venture in Kenya involved in collection of market waste and recovering biogas, compost, liquid bio fertilizer. The Dunga Beach biogas plant in Kenya turns the invasive water hyacinth (Eichhornia crassipes) on the shores of Lake Victoria to biogas energy, an alternative to charcoal burning for fish vendors at the beach. Keveye Girls is a boarding high school located in Vihiga County. Through consultations and interventions by the Department of Agriculture and Livestock at Vihiga County, Keveye Girls now converts cow dung into biogas, which is then used to power the school’s science laboratories and kitchen as an alternative to LPG gas and wood energy. Similar case studies exist in Burkina Faso. FasoBiogaz, an SME was founded by two Dutch entrepreneurs and supported by the Dutch government and is fully operated by a local team. FasoBiogaz operates the first industrial biogas plant connected to the SONABEL power grid and provides innovative resource recovery solutions producing 550 KW of power.
The present report covers four case studies from Kenya and Burkina Faso related to recovering energy from agrowaste. Biogas International Limited (BIL) is a public private venture in Kenya involved in collection of market waste and recovering biogas, compost, liquid bio fertilizer. The Dunga Beach biogas plant in Kenya turns the invasive water hyacinth (Eichhornia crassipes) on the shores of Lake Victoria to biogas energy, an alternative to charcoal burning for fish vendors at the beach. Keveye Girls is a boarding high school located in Vihiga County. Through consultations and interventions by the Department of Agriculture and Livestock at Vihiga County, Keveye Girls now converts cow dung into biogas, which is then used to power the school’s science laboratories and kitchen as an alternative to LPG gas and wood energy. Similar case studies exist in Burkina Faso. FasoBiogaz, an SME was founded by two Dutch entrepreneurs and supported by the Dutch government and is fully operated by a local team. FasoBiogaz operates the first industrial biogas plant connected to the SONABEL power grid and provides innovative resource recovery solutions producing 550 KW of power.
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