Bio-reduction of arsenate using a hydrogen-based membrane biofilm reactor

Chemosphere
Jinwook ChungBruce E Rittmann

Abstract

Arsenate (As(V)) is a carcinogen and a significant problem in groundwater in many parts of the world. Since As(III) is generally more mobile and more toxic than As(V), the reduction of As(V) to As(III) is not a conventional treatment goal. However, reducing As(V) to As(III) may still be a means for decontamination, because As(III) can be removed from solution by precipitation or complexation with sulfide or by adsorption to Fe(II)-based solids. A promising approach for reducing oxidized contaminants is the H2-based membrane biofilm reactor (MBfR). In the case of arsenate, the MBfR allows bio-reduction of As(V) to As(III) and sulfate to sulfide, thereby giving the potential for As removal, such as by precipitation of As2S3(s) or formation of Fe(II)-based solids. When As(V) was added to a denitrifying MBfR, As(V) was reduced immediately to As(III). Decreasing the influent sulfate loading increased As(V) reduction for a fixed H2 pressure. A series of short-term experiments elaborated on how As(V) loading, nitrate and sulfate loadings, and H2 pressure controlled As(V) reduction. Lower nitrate loading and increased As(V) loading increased the extent of As(V) reduction, but increased H2 pressure did not increase As(V) reduction. As(V...Continue Reading

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Citations

Oct 9, 2012·Environmental Science & Technology·Aura Ontiveros-ValenciaRosa Krajmalnik-Brown
Dec 3, 2010·Environmental Technology·Dominika Celmer-RepinJan A Oleszkiewicz
Feb 11, 2014·Journal of Bioscience and Bioengineering·Shigeki Yamamura, Seigo Amachi
Apr 20, 2010·Journal of Environmental Sciences (China)·Siqing XiaXin Yang
Nov 1, 2015·Water Research·Chun-Yu LaiHe-Ping Zhao
Feb 28, 2007·Journal of Hazardous Materials·Dinesh Mohan, Charles U Pittman
Jan 30, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Ken CampbellGlen Daigger
Aug 5, 2017·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Jure ŠkrabanJanja Trček
Mar 23, 2019·Materials·Ewelina Weidner, Filip Ciesielczyk
Jul 26, 2021·Ecotoxicology and Environmental Safety·Shani ShohamMicha Ilan

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