He had been visiting Professor at University of Augsburg, Germany and Visiting Scientist to Ben Gurion University, Israel and University of Newcastle upon Tyne, UK under Marie Curie fellowship by European Union. He had stint as a faculty of various capacities in renowned engineering colleges and research laboratory. He has been working in the field of anaerobic wastewater treatment, bioenergy recovery during wastewater treatment using microbial fuel cell (MFC) and bio-electrochemical systems. He is recognized worldwide in scientific community for his research contribution in the development of bio-electrochemical processes and his research group stands among the top two research labs in the world in terms of scientific publications. The first of its kind MFC based onsite toilet waste treatment system ‘Bioelectric toilet’ developed by him received wide publicity in electronic and print media. He has successfully completed multinational collaborative projects with European Countries and few of the projects are ongoing. He has also provided design of industrial wastewaters and sewage treatment plants in India and abroad. He has been working on setting up wastewater treatment plants to produce reusable quality treated water at affordable cost. At present he is coordinating one such project jointly funded by European Union and Department of Science and Technology, Government of India. He has worked as a member of IIT consortium for rejuvenation of water quality of River Ganga. He has been helping various state Governments (Odissa, Chattisgarh, Jharkhand, West Bengal) and industries for providing wastewater collection and treatment solutions. Having two years of industrial experience and 29 years of teaching experience, he has guided 36 Ph.D. Research Scholars and 65 Master students’ projects. He has contributed 334 research papers in journals of international repute, and contributed 105 book chapters. His research work has been presented in more than 294 conferences in India and abroad. He has written text book on ‘Wastewater to Water’ published by Springer and Edited three books published by Wiley, namely Microbial Electrochemical Technologies; Microconstituents in the environment; and Microplastics in Environment. He has delivered invited lectures in the various reputed universities in the world to name a few, Newcastle upon Tyne, UK; Bremen and Augusburg, Germany; University of Tartu, Estonia, University of California, Berkeley, USA, Hong Kong University, UiT Narvik, Norway, etc. He has visited several universities in the world from USA, Canada, Europe, Australia and Asia. He has received recognition for his research contribution by getting elected as Fellow, INAE and NASI; VAISWIK award 2020, Member ASCE; receiving Swachha Bharat Award 2017; Gandhian Young Technology Innovation awards; National Design Award and Best paper Awards by Institution of Engineers, India, Distinguished Speaker Award by Indian Institute of Chemical Engineering, etc.