Enhanced treatment of chloronitrobenzenes wastewater in coupled bio-electrode-anaerobic process via nano-magnetite addition

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Caiqin Wang, Jie Jin and Liang Zhu

Zhejiang University, China

: J Nanomater Mol Nanotechnol

Abstract

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Because of direct electron transfer process playing a key role in anaerobic reduction of persistent toxic organic compounds such as 2,4-dichloro-nitrobenzene (2,4-DClNB), a novel nano-magnetite enhanced bio-electrode-UASB reactor was established in this study, and the removal performance and reductive de-chlorination mechanism were investigated. Results showed that with the influent 2,4-DClNB load rates increasing from 25 g m-3 d-1 to 200 g m-3 d-1, the COD, target pollutant removal and pH in combined system were stable relatively, and the removal efficiencies were up to 97% and 100%, respectively. The electrode biofilm was analyzed by SEM, and results showed that both the anode and cathode biofilms were covered with nano-magnetite. Inside the biofilms, there also existed nano-magnetite. This finding could further confirm that nano-magnetite plays an important role in enchanting extracellular electron transfer (EET) and pollutants removal in magnetite enhanced bioelectrode- UASB reactor.

Biography

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