关键字：MEMBRANE BIOFILM REACTOR; DENITRIFICATION AME-D; WASTE-WATER; GEN. NOV.; DEPENDENT DENITRIFICATION; ANAEROBIC OXIDATION; PHYLUM CHLOROFLEXI; CARBON-SOURCES; REDUCTION; METHANOGENESIS

摘要：Nitrate (NO3-) removal from groundwater is of great importance since it has posed a major risk to human health. Although methane-based denitrification processes have been developed, the practical application of methane as a carbon source for denitrification is constrained by either a long start-up time or a relatively low nitrate removal rate. This study investigated nitrate removal capacity by using a methane-based membrane biofilm reactor (MBfR) feeding with synthetic groundwater. A high nitrate removal rate of 706 mg-N L-1 d(-1) was achieved, which is by far the highest rate reported for methane-based denitrification reactors. Short-chain fatty acids (SCFAs) were detected as products of methane bioconversion, with concentrations of acetic and propionic acid up to 168.8 mg L-1 and 50.2 mg L-1, respectively. Long-term operation and batch test results revealed that the SCFAs generated from methane bioconversion were in situ utilized for supporting nitrate removal as carbon and electron sources, thus leading to a practically useful removal rate. The findings suggest that it is promising to apply the methane-based MBfR to remove nitrate from nitrate contaminated groundwater.

卷号：393

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是否译文：否