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Simultaneous Bioreduction of Multiple Oxidized Contaminants Using a Membrane Biofilm Reactor
Author(s) -
Li Haixiang,
Lin Hua,
Xu Xiaoyin,
Jiang Minmin,
Chang CheinChi,
Xia Siqing
Publication year - 2017
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143016x14609975746686
Subject(s) - chemistry , sulfate , nuclear chemistry , organic chemistry
ABSTRACT: This study tests a hydrogen‐based membrane biofilm reactor (MBfR) to investigate simultaneous bioreduction of selected oxidized contaminants, including nitrate (‐N), sulfate (), bromate (), chromate (Cr(VI)) and para ‐chloronitrobenzene ( p ‐CNB). The experiments demonstrate that MBfR can achieve high performance for contaminants bioreduction to harmless or immobile forms in 240 days, with a maximum reduction fluxes of 0.901 g ‐N/m 2 ·d, 1.573 g /m 2 ·d, 0.009 g /m 2 ·d, 0.022 g Cr(VI)/m 2 ·d, and 0.043 g p ‐CNB/m 2 ·d. Increasing H 2 pressure and decreasing influent surface loading enhanced removal efficiency of the reactor. Flux analysis indicates that nitrate and sulfate reductions competed more strongly than , Cr(VI) and p ‐CNB reduction. The average H 2 utilization rate, H 2 flux, and H 2 utilization efficiency of the reactor were 0.026 to 0.052 mg H 2 /cm 3 ·d, 0.024 to 0.046 mg H 2 /cm 2 ·d, and 97.5% to 99.3% (nearly 100%). Results show the hydrogen‐based MBfR may be suitable for removing multiple oxidized contaminants in drinking water or groundwater.