Abstract：
:A bench-scale constructed wetland combined with microbial electrochemical technology (MET-CW) was run for 400days 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.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Wei M,Rakoczy J,Vogt C,Harnisch F,Schumann R,Richnow HHdoi
10.1016/j.biortech.2015.07.111subject
Has Abstractpub_date
2015-11-01 00:00:00pages
490-9eissn
0960-8524issn
1873-2976pii
S0960-8524(15)01082-2journal_volume
196pub_type
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