Vinay Kumar Tyagi is a Scientist D at the Environmental Hydrology Division, National Institute of Hydrology, Roorkee, India. His research interests include anaerobic digestion, energy-efficient wastewater treatment systems, sludge management, and advanced biomass pretreatment methods. He has over 100 publications to his credit, including full-text books, over 40 book chapters and manuals. Dr. Tyagi is a Fellow and Life Member of several professional bodies and organizations. He is a Management Committee Member of the International Water Association (IWA) Sludge Management Specialist Group and represents the South Asia Division, and also the Anaerobic Digestion Specialist Group. Dr. Tyagi has extensive international research exposure and collaborations in Norway, Taiwan, Spain, Japan, and Singapore in various environmental research domains of wastewater treatment, sludge pretreatment, and biomass to bioenergy recovery. Manish Kumar earned Ph.D in Environmental Engineering from the University of Tokyo, Japan and is currently a faculty member at IIT Gandhinagar, Gujarat, India. He supervised 6 Ph.D thesis and >25 master dissertations. He contributed >100 journal articles, >50 book chapters and has edited/co-edited 6 books with international publishers. He has 20 years’ experience in research and teaching. He is an executive committee member of IWA-India Chapter and represents South-Asia in IWA specialist group for METRAL and related substances. He has won several accolades including Best Research Award (2013) at 4th Asia Pacific Water Young Professional Conference, two Best Poster Awards (2013 and 2016), DST young scientist grant, JSPS Research Fellowship, COE Young Researcher Fund, and Linnaeus-Palme Grant from SIDA, Sweden. He is associate editor for Elsevier’s Journal of Groundwater for Sustainable Development and Japan Society for Water’s journal Hydrological Research Letters. He was the lead editor for four virtual special issues for international journals including Journal of Hazardous Material. Most recently, he has joined a global collaboration of 51 institutes on Wastewater-Based Epidemiology of COVID-19. Dr. An is an Associate Professor in the School of Energy and Environment at the City University of Hong Kong (CityU). She received her PhD in Civil and Environmental Engineering at the Hong Kong University of Science and Technology (HKUST). Her dissertation on sludge minimization mechanisms in Oxic-Settling-Anaerobic process in wastewater treatment system was well received and cited. Since 2009, Dr. An has extended her research and education career with Sustainability concepts at the University of Tokyo, Japan. She has conducted several research projects and field work focused on sustainable water management and urban development. Dr. An is a member of the Hong Kong Institution of Engineers (MHKIE), registered Korea civil engineer, member of the association of energy engineers (MAEE), certified carbon auditor professional (CAP), and member of the international water association (IWA). Her research emphasizes the development of emerging membrane technologies and innovative approaches to solving pressing water quality and quantity issues. Dr. Cetecioglu is Asscoiate Professor in the Department of Chemical Engineering-KTH, Sweden. Her research has centered on resource recovery from wastewater by combining wastewater engineering and molecular microbiology ecology. She applied her knowledge recently is carbon neutral wastewater treatment plants, which has attracted a huge amount of interest during recent years due to the potential of turning waste into resources and for the potential of securing a future supply of bio-based products. She is developing resource recovery units which are exchangeable in existing wastewater treatment plants in one of her ongoing projects, CarbonNextGen. This project has recently been listed in the top 100 projects by the Swedish Royal Academy of Engineering Sciences. There is still a lot of work required to develop environmentally and economically sustainable processes capable of closing the circular economy loop and turning waste into resources. She has contributed more than 80 publications to leading international peer‐reviewed journals, conference proceedings, and books. One of the books to which she contributed was awarded by Turkish Academy of Science and this book is still used as course material in universities. She is member of both IWA and ISME and she is the leader of Circular economy Cluster at KTH Water Center.

• 1. Wastewater to R3 – resource recovery, recycling, and reuse efficiency in urban wastewater treatment plants2. Energy and resources recovery from wastewater treatment systems3. Water reclamation, recycle, and reuse4. Advanced biological water reclamation and reuse technologies for recirculating aquaculture system5. Hybrid forward/reverse osmosis (HFRO): An approach for optimized operation and sustainable resource recovery7. Energy self-sufficiency in wastewater treatment plants: Perspectives, challenges, and opportunities8. Cellulosic materials recovery from municipal wastewater: From treatment plants to the market9. Assessing algae-based wastewater treatment—a life cycle assessment approach10. Methanotrophic bacterial biorefineries: resource recovery and GHG mitigation through the production of bacterial biopolymers11. Microbial electrochemical technologies for wastewater treatment: insight into theory and reality12. Waste(water) to feed protein: effluent characteristics, protein recovery, and single-cell protein production from food industry waste streams13. Acids (VFAs) and bioplastic (PHA) recovery14. Algal treatment of wastewater for resources recovery15. Polyhydroxyalkanoate production from food industry residual streams using mixed microbial cultures16. Removal of nitrogen and phosphorus from wastewater through the moving bed biofilm reactor17. Wastewater to biogas recovery18. Wastewater to bioactive products: recovery of polysaccharides in activated sludge from sulfate-laden wastewater19. Circular city concept for future biorefineries20. Sludge treatment: an approach toward environmental remediation21. Values added products recovery from sludge22. Biogas recovery from sludge23. Cellulose and extracellular polymer recovery from sludge24. Cambi Thermal Hydrolysis Process (CambiTHP) for sewage sludge treatment25. Reutilization of sludge as fertilizer26. Valorizing sludge: a biorefinery perspective prospecting for sustainable development

Vinay Kumar Tyagi is a Scientist D at the Environmental Hydrology Division, National Institute of Hydrology, Roorkee, India. His research interests include anaerobic digestion, energy-efficient wastewater treatment systems, sludge management, and advanced biomass pretreatment methods. He has over 100 publications to his credit, including full-text books, over 40 book chapters and manuals. Dr. Tyagi is a Fellow and Life Member of several professional bodies and organizations. He is a Management Committee Member of the International Water Association (IWA) Sludge Management Specialist Group and represents the South Asia Division, and also the Anaerobic Digestion Specialist Group. Dr. Tyagi has extensive international research exposure and collaborations in Norway, Taiwan, Spain, Japan, and Singapore in various environmental research domains of wastewater treatment, sludge pretreatment, and biomass to bioenergy recovery. Manish Kumar earned Ph.D in Environmental Engineering from the University of Tokyo, Japan and is currently a faculty member at IIT Gandhinagar, Gujarat, India. He supervised 6 Ph.D thesis and >25 master dissertations. He contributed >100 journal articles, >50 book chapters and has edited/co-edited 6 books with international publishers. He has 20 years’ experience in research and teaching. He is an executive committee member of IWA-India Chapter and represents South-Asia in IWA specialist group for METRAL and related substances. He has won several accolades including Best Research Award (2013) at 4th Asia Pacific Water Young Professional Conference, two Best Poster Awards (2013 and 2016), DST young scientist grant, JSPS Research Fellowship, COE Young Researcher Fund, and Linnaeus-Palme Grant from SIDA, Sweden. He is associate editor for Elsevier’s Journal of Groundwater for Sustainable Development and Japan Society for Water’s journal Hydrological Research Letters. He was the lead editor for four virtual special issues for international journals including Journal of Hazardous Material. Most recently, he has joined a global collaboration of 51 institutes on Wastewater-Based Epidemiology of COVID-19. Dr. An is an Associate Professor in the School of Energy and Environment at the City University of Hong Kong (CityU). She received her PhD in Civil and Environmental Engineering at the Hong Kong University of Science and Technology (HKUST). Her dissertation on sludge minimization mechanisms in Oxic-Settling-Anaerobic process in wastewater treatment system was well received and cited. Since 2009, Dr. An has extended her research and education career with Sustainability concepts at the University of Tokyo, Japan. She has conducted several research projects and field work focused on sustainable water management and urban development. Dr. An is a member of the Hong Kong Institution of Engineers (MHKIE), registered Korea civil engineer, member of the association of energy engineers (MAEE), certified carbon auditor professional (CAP), and member of the international water association (IWA). Her research emphasizes the development of emerging membrane technologies and innovative approaches to solving pressing water quality and quantity issues. Dr. Cetecioglu is Asscoiate Professor in the Department of Chemical Engineering-KTH, Sweden. Her research has centered on resource recovery from wastewater by combining wastewater engineering and molecular microbiology ecology. She applied her knowledge recently is carbon neutral wastewater treatment plants, which has attracted a huge amount of interest during recent years due to the potential of turning waste into resources and for the potential of securing a future supply of bio-based products. She is developing resource recovery units which are exchangeable in existing wastewater treatment plants in one of her ongoing projects, CarbonNextGen. This project has recently been listed in the top 100 projects by the Swedish Royal Academy of Engineering Sciences. There is still a lot of work required to develop environmentally and economically sustainable processes capable of closing the circular economy loop and turning waste into resources. She has contributed more than 80 publications to leading international peer‐reviewed journals, conference proceedings, and books. One of the books to which she contributed was awarded by Turkish Academy of Science and this book is still used as course material in universities. She is member of both IWA and ISME and she is the leader of Circular economy Cluster at KTH Water Center.

• 1. Wastewater to R3 – resource recovery, recycling, and reuse efficiency in urban wastewater treatment plants2. Energy and resources recovery from wastewater treatment systems3. Water reclamation, recycle, and reuse4. Advanced biological water reclamation and reuse technologies for recirculating aquaculture system5. Hybrid forward/reverse osmosis (HFRO): An approach for optimized operation and sustainable resource recovery7. Energy self-sufficiency in wastewater treatment plants: Perspectives, challenges, and opportunities8. Cellulosic materials recovery from municipal wastewater: From treatment plants to the market9. Assessing algae-based wastewater treatment—a life cycle assessment approach10. Methanotrophic bacterial biorefineries: resource recovery and GHG mitigation through the production of bacterial biopolymers11. Microbial electrochemical technologies for wastewater treatment: insight into theory and reality12. Waste(water) to feed protein: effluent characteristics, protein recovery, and single-cell protein production from food industry waste streams13. Acids (VFAs) and bioplastic (PHA) recovery14. Algal treatment of wastewater for resources recovery15. Polyhydroxyalkanoate production from food industry residual streams using mixed microbial cultures16. Removal of nitrogen and phosphorus from wastewater through the moving bed biofilm reactor17. Wastewater to biogas recovery18. Wastewater to bioactive products: recovery of polysaccharides in activated sludge from sulfate-laden wastewater19. Circular city concept for future biorefineries20. Sludge treatment: an approach toward environmental remediation21. Values added products recovery from sludge22. Biogas recovery from sludge23. Cellulose and extracellular polymer recovery from sludge24. Cambi Thermal Hydrolysis Process (CambiTHP) for sewage sludge treatment25. Reutilization of sludge as fertilizer26. Valorizing sludge: a biorefinery perspective prospecting for sustainable development

Vinay Kumar Tyagi is a Scientist D at the Environmental Hydrology Division, National Institute of Hydrology, Roorkee, India. His research interests include anaerobic digestion, energy-efficient wastewater treatment systems, sludge management, and advanced biomass pretreatment methods. He has over 100 publications to his credit, including full-text books, over 40 book chapters and manuals. Dr. Tyagi is a Fellow and Life Member of several professional bodies and organizations. He is a Management Committee Member of the International Water Association (IWA) Sludge Management Specialist Group and represents the South Asia Division, and also the Anaerobic Digestion Specialist Group. Dr. Tyagi has extensive international research exposure and collaborations in Norway, Taiwan, Spain, Japan, and Singapore in various environmental research domains of wastewater treatment, sludge pretreatment, and biomass to bioenergy recovery. Manish Kumar earned Ph.D in Environmental Engineering from the University of Tokyo, Japan and is currently a faculty member at IIT Gandhinagar, Gujarat, India. He supervised 6 Ph.D thesis and >25 master dissertations. He contributed >100 journal articles, >50 book chapters and has edited/co-edited 6 books with international publishers. He has 20 years’ experience in research and teaching. He is an executive committee member of IWA-India Chapter and represents South-Asia in IWA specialist group for METRAL and related substances. He has won several accolades including Best Research Award (2013) at 4th Asia Pacific Water Young Professional Conference, two Best Poster Awards (2013 and 2016), DST young scientist grant, JSPS Research Fellowship, COE Young Researcher Fund, and Linnaeus-Palme Grant from SIDA, Sweden. He is associate editor for Elsevier’s Journal of Groundwater for Sustainable Development and Japan Society for Water’s journal Hydrological Research Letters. He was the lead editor for four virtual special issues for international journals including Journal of Hazardous Material. Most recently, he has joined a global collaboration of 51 institutes on Wastewater-Based Epidemiology of COVID-19. Dr. An is an Associate Professor in the School of Energy and Environment at the City University of Hong Kong (CityU). She received her PhD in Civil and Environmental Engineering at the Hong Kong University of Science and Technology (HKUST). Her dissertation on sludge minimization mechanisms in Oxic-Settling-Anaerobic process in wastewater treatment system was well received and cited. Since 2009, Dr. An has extended her research and education career with Sustainability concepts at the University of Tokyo, Japan. She has conducted several research projects and field work focused on sustainable water management and urban development. Dr. An is a member of the Hong Kong Institution of Engineers (MHKIE), registered Korea civil engineer, member of the association of energy engineers (MAEE), certified carbon auditor professional (CAP), and member of the international water association (IWA). Her research emphasizes the development of emerging membrane technologies and innovative approaches to solving pressing water quality and quantity issues. Dr. Cetecioglu is Asscoiate Professor in the Department of Chemical Engineering-KTH, Sweden. Her research has centered on resource recovery from wastewater by combining wastewater engineering and molecular microbiology ecology. She applied her knowledge recently is carbon neutral wastewater treatment plants, which has attracted a huge amount of interest during recent years due to the potential of turning waste into resources and for the potential of securing a future supply of bio-based products. She is developing resource recovery units which are exchangeable in existing wastewater treatment plants in one of her ongoing projects, CarbonNextGen. This project has recently been listed in the top 100 projects by the Swedish Royal Academy of Engineering Sciences. There is still a lot of work required to develop environmentally and economically sustainable processes capable of closing the circular economy loop and turning waste into resources. She has contributed more than 80 publications to leading international peer‐reviewed journals, conference proceedings, and books. One of the books to which she contributed was awarded by Turkish Academy of Science and this book is still used as course material in universities. She is member of both IWA and ISME and she is the leader of Circular economy Cluster at KTH Water Center.

• 1. Wastewater to R3 – resource recovery, recycling, and reuse efficiency in urban wastewater treatment plants2. Energy and resources recovery from wastewater treatment systems3. Water reclamation, recycle, and reuse4. Advanced biological water reclamation and reuse technologies for recirculating aquaculture system5. Hybrid forward/reverse osmosis (HFRO): An approach for optimized operation and sustainable resource recovery7. Energy self-sufficiency in wastewater treatment plants: Perspectives, challenges, and opportunities8. Cellulosic materials recovery from municipal wastewater: From treatment plants to the market9. Assessing algae-based wastewater treatment—a life cycle assessment approach10. Methanotrophic bacterial biorefineries: resource recovery and GHG mitigation through the production of bacterial biopolymers11. Microbial electrochemical technologies for wastewater treatment: insight into theory and reality12. Waste(water) to feed protein: effluent characteristics, protein recovery, and single-cell protein production from food industry waste streams13. Acids (VFAs) and bioplastic (PHA) recovery14. Algal treatment of wastewater for resources recovery15. Polyhydroxyalkanoate production from food industry residual streams using mixed microbial cultures16. Removal of nitrogen and phosphorus from wastewater through the moving bed biofilm reactor17. Wastewater to biogas recovery18. Wastewater to bioactive products: recovery of polysaccharides in activated sludge from sulfate-laden wastewater19. Circular city concept for future biorefineries20. Sludge treatment: an approach toward environmental remediation21. Values added products recovery from sludge22. Biogas recovery from sludge23. Cellulose and extracellular polymer recovery from sludge24. Cambi Thermal Hydrolysis Process (CambiTHP) for sewage sludge treatment25. Reutilization of sludge as fertilizer26. Valorizing sludge: a biorefinery perspective prospecting for sustainable development