Complete arsenic removal from water using biocatalytic systems based on anaerobic films grown on carbon fibers

Abstract

Arsenic is a hazardous metalloid with potentially negative impacts on both the environment and human health. Current methods of arsenic remediation are expensive and can cause secondary contamination. In this paper we explore the potential of using bioelectrochemical systems (a group of environmentally friendly bio-based technologies with great potential for bioremediation and waste valorisation) for arsenic removal. Previous studies have reported that the spontaneous oxidation of As(III) to As(V) was completely realized in bioelectrochemical systems, however, any of the them succeeded in removing the total arsenic concentration. This study demonstrates that not only it is possible to oxidize As(III) to As(V), but also the total elimination of arsenic can be achieved as the result of intracellular accumulation.