4.8 Article

Enhancement and monitoring of pollutant removal in a constructed wetland by microbial electrochemical technology

期刊

BIORESOURCE TECHNOLOGY
卷 196, 期 -, 页码 490-499

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.07.111

关键词

Benzene; Methyl-tert-butyl ether; Ammonium; MET; Bioremediation

资金

  1. Helmholtz Centre for Environmental Research-UFZ in the scope of the SAFIRA II Research Project (Revitalization of Contaminated Land and Groundwater at Megasites, subproject Compartment Transfer-CoTra)
  2. BMBF
  3. Helmholtz-Association (Young Investigators Group)

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A bench-scale constructed wetland combined with microbial electrochemical technology (MET-CW) was run for 400 days with groundwater contaminated with benzene, methyl-tert-butyl ether ( MTBE), and ammonium (NH4+). Four vertically stacked anode modules were embedded into a sand bed and connected with a stainless steel cathode placed in an open water pond. In the zone of presence of anode modules, significantly more benzene and MTBE were removed in the MET-CW compared to the control CW without MET in the first 150 operation days. Benzene was identified as primary electron donor at the anode. Benzene removal and current densities were linearly correlated, implying the potential of the system for electrochemically monitoring benzene biodegradation. Compound-specific isotope analysis (CSIA) indicated that benzene was initially activated by monohydroxylation forming intermediates which were subsequently oxidized accompanied by extracellular electron transfer, leading to current production. NH4+ removal was not stimulated by MET. (C) 2015 Elsevier Ltd. All rights reserved.

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