Anoxic oxidation of arsenite linked to chemolithotrophic denitrification in continuous bioreactors.

ABSTRACT: In this study, the anoxic oxidation of arsenite (As(III)) linked to chemolithotrophic denitrification was shown to be feasible in continuous bioreactors. Biological oxidation of As(III) was stable over prolonged periods of operation ranging up to 3 years in continuous denitrifying bioreactors with granular biofilms. As(III) was removed with a high conversion efficiency (>92%) to arsenate (As(V)) in periods with high volumetric loadings (e.g., 3.5-5.1 mmol As L(reactor) (-1) day(-1)). The maximum specific activity of sampled granular sludge from the bioreactors was 0.98 +/- 0.04 mmol As(V) formed g(-1) VSS day(-1) when determined at an initial concentration of 0.5 mM As(III). The microbial population adapted to high influent concentrations of As(III) up to 5.2 mM. However, the As(III) oxida

SUBMITTER: Sun W 

PROVIDER: S-EPMC4532337 | biostudies-literature | 2010 Apr

REPOSITORIES: biostudies-literature