Joyabrata Mal – författare

Recent years have seen a growing interest in the application of chalcogenide nanoparticles (NPs), e.g. Se, Te, CdSe and CdTe NPs, in various industrial sectors including energy, petroleum refining and in the field of biology and medicine. Moreover, due to the high toxicity of chalcogen oxyanions, their release into the environment is of great concern. Thus, emphasis was given in this study on the development of a novel microbial synthesis process of chalcogenide NPs by combining biological treatment of Se/Te containing wastewaters with biorecovery in the form of Se NPs, Te NPs and CdSe NPs. Enrichment of Se-oxyanion reducing microorganisms was carried out to simultaneously remove selenite (Se(IV)) and cadmium (Cd(II)) from wastewaters by combining bioremediation of toxic Se-rich wastewater with the biorecovery of Se as CdSe NPs. The results showed compositional changes in the extracellular polymeric substances (EPS) matrix of the anaerobic granular sludge upon exposure to Cd(II) and Se(IV) and identified the roles of EPS fractions in the biogenesis of CdSe NPs. Besides, it was found that the EPS on the surface of the biogenic Se NPs play a major role in lowering the bioavailability and toxicity of biogenic Se(0) compared to chemogenic Se(0) NPs. An upflow anaerobic sludge blanket (UASB) reactor was used for the first time to continuously remove tellurite from wastewater and recover biogenic Te(0).

Recent years have seen a growing interest in the application of chalcogenide nanoparticles (NPs), e.g. Se, Te, CdSe and CdTe NPs, in various industrial sectors including energy, petroleum refining and in the field of biology and medicine. Moreover, due to the high toxicity of chalcogen oxyanions, their release into the environment is of great concern. Thus, emphasis was given in this study on the development of a novel microbial synthesis process of chalcogenide NPs by combining biological treatment of Se/Te containing wastewaters with biorecovery in the form of Se NPs, Te NPs and CdSe NPs. Enrichment of Se-oxyanion reducing microorganisms was carried out to simultaneously remove selenite (Se(IV)) and cadmium (Cd(II)) from wastewaters by combining bioremediation of toxic Se-rich wastewater with the biorecovery of Se as CdSe NPs. The results showed compositional changes in the extracellular polymeric substances (EPS) matrix of the anaerobic granular sludge upon exposure to Cd(II) and Se(IV) and identified the roles of EPS fractions in the biogenesis of CdSe NPs. Besides, it was found that the EPS on the surface of the biogenic Se NPs play a major role in lowering the bioavailability and toxicity of biogenic Se(0) compared to chemogenic Se(0) NPs. An upflow anaerobic sludge blanket (UASB) reactor was used for the first time to continuously remove tellurite from wastewater and recover biogenic Te(0).

The book aims to highlight the application of microbial electrochemical technologies, their fundamental to advanced, recent applications, management strategies, and relevant case studies. The book also attempts to highlight existing research and technological advancements on all facets of instruments and methods for assessing and keeping track of water contaminants. The section on current trends and advancements in this book discusses the most recent advancements in microbial electrochemical technologies and related technologies to lessen the contamination of water resources. The book goes into great detail about the fundamental aspects of water pollution, including their causes, primary sources, detection, treatment, and mitigation using microbial electrochemical technologies and management systems as well as commercialization and economics thoughts that are currently of significant importance.

Additionally, with the aid of appropriate tables and figures, all of these chapters havebeen arranged according to recent developments and aspects of the field. The book''s goal is to give readers a fundamental understanding of how microbial electrochemical technologies work.

It is intended for a wide range of readers, including undergraduate and graduate students, researchers, academicians, environmentalists, policymakers, businesspeople, and R&D teams. We gratefully thank all of the authors. We''ll be open to recommendations for making the next book or edition better.

This book covers broader application of biotechnology for the protection of environment through different bioremediation and biodegradation techniques developed for removal of environmental contaminants including the recently discovered contaminants. The book offers a comprehensive overview of environmental pollutants including their fate, behavior, environmental and associated health risks. It is useful reading material for postgraduate and graduate students of environmental biotechnology, environmental microbiology and ecology. Young researchers also find the chapters useful understanding the latest developments.