期刊
JOURNAL OF ENVIRONMENTAL ENGINEERING
卷 144, 期 6, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)EE.1943-7870.0001376
关键词
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资金
- Natural Science and Engineering Research Council (NSERC)
- New Brunswick Innovation Foundation (NBIF)
- ADI Systems Inc.
Membrane and reactor performance for an anaerobic membrane bioreactor (AnMBR) treating a high-strength starch-based wastewater [average chemical oxygen demand (COD) of 84.8 +/- 8.9g/L] was examined under six varied cleaning protocols to find optimal operating conditions. The AnMBR was composed of a 1,000-L anaerobic continuous stirred tank reactor (CSTR) integrated with an external, tubular nanofiltration membrane module operated in cross-flow mode. The polyvinylidene fluoride-based membrane module had a nominal pore size of 30 nm, a total membrane area of 0.42m2, and a cross-flow velocity of 2.5m/s. The different cleaning protocols were provided by varying the membrane's permeate backwash duration, frequency, and flow rate and by incorporating chemically enhanced backwash cycles with the use of a mixed 250-ppm sodium hydroxide and 250-ppm hypochlorite solution. Reactor performance did not appear to be cleaning protocol dependent; however, a decline in reactor-specific methanogenic activity (SMA) was noticed over the duration of the study. A single, longer-duration chemically enhanced backwash offered the highest improvement in membrane performance over all other cleaning protocols.
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