Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Oxyanions Removal by Biological Processes: A Review
Abstract Major toxins of drinking water are oxyanions such as perchlorate, nitrate, sulfate, arsenic (arsenate and arsenite), iodate, uraninites, bromate, chromates and selenite, which affects the human health with numerous diseases such as thyroidal disorder, diarrhea and cancer. It is imperative to understand the effects of various parameters that affect the bioreduction of oxyanions removal. Sometimes it helps in reduction in treatment cost in terms of amount of carbon requirement while simultaneous bioreduction of multiple number of oxyanions. As for example, simultaneous bioreduction of sulfate and nitrate will generate innocuous nitrogen and elemental sulfur as an end product. Formation of nitrogen gas and elemental sulfur is due to chemical reaction between the highly reactive nitrite (an intermediate of denitrification process) and sulfides (an unacceptable end product of sulfate bioreduction). The oxyanions, perchlorate, nitrate and sulfate can play a major role in removal of arsenic in the form of solid arseno-sulfide from aqueous phase. However, the efficiency will greatly depend upon the feeding and operating conditions of the reactor such as COD/oxyanion ratio, oxyanions loading rate, and hydraulic retention time (HRT). In this paper, effect of various factors on bioreduction of different oxyanions is discussed.
Oxyanions Removal by Biological Processes: A Review
Abstract Major toxins of drinking water are oxyanions such as perchlorate, nitrate, sulfate, arsenic (arsenate and arsenite), iodate, uraninites, bromate, chromates and selenite, which affects the human health with numerous diseases such as thyroidal disorder, diarrhea and cancer. It is imperative to understand the effects of various parameters that affect the bioreduction of oxyanions removal. Sometimes it helps in reduction in treatment cost in terms of amount of carbon requirement while simultaneous bioreduction of multiple number of oxyanions. As for example, simultaneous bioreduction of sulfate and nitrate will generate innocuous nitrogen and elemental sulfur as an end product. Formation of nitrogen gas and elemental sulfur is due to chemical reaction between the highly reactive nitrite (an intermediate of denitrification process) and sulfides (an unacceptable end product of sulfate bioreduction). The oxyanions, perchlorate, nitrate and sulfate can play a major role in removal of arsenic in the form of solid arseno-sulfide from aqueous phase. However, the efficiency will greatly depend upon the feeding and operating conditions of the reactor such as COD/oxyanion ratio, oxyanions loading rate, and hydraulic retention time (HRT). In this paper, effect of various factors on bioreduction of different oxyanions is discussed.
Oxyanions Removal by Biological Processes: A Review
Bhande, Ranjeeta (Autor:in) / Ghosh, Pranab Kumar (Autor:in)
01.01.2018
18 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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