Biological As(III) oxidation in biofilters by using native groundwater microorganisms

The Science of the Total Environment
Simona CrognaleSimona Rossetti

Abstract

Arsenic (As) contamination in drinking water represents a worldwide threat to human health. During last decades, the exploitation of microbial As-transformations has been proposed for bioremediation applications. Among biological methods for As-contaminated water treatment, microbial As(III)-oxidation is one of the most promising approaches since it can be coupled to commonly used adsorption removal technologies, without requiring the addition of chemicals and producing toxic by-products. Despite the As(III) oxidation capability has been described in several bacterial pure or enrichment cultures, very little is known about the real potentialities of this process when mixed microbial communities, naturally occurring in As contaminated waters, are used. This study highlighted the contribution of native groundwater bacteria to As(III)-oxidation in biofilters, under conditions suitable for a household-scale treatment system. This work elucidated the influence of a variety of experimental conditions (i.e., various filling materials, flow rates, As(III) inflow concentration, As(III):As(V) ratio, filter volumes) on the microbially-mediated As(III)-oxidation process in terms of oxidation efficiency and rate. The highest oxidation effic...Continue Reading

Citations

Oct 22, 2019·New Biotechnology·Barbara TonanziAndrea Gianico
Jul 17, 2021·Water Research·Md AnnaduzzamanDoris van Halem
Dec 4, 2021·Environmental Science and Pollution Research International·Philippe N BertinMichel Mench

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