期刊
ENVIRONMENTAL TECHNOLOGY
卷 38, 期 10, 页码 1263-1274出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2016.1225127
关键词
Anaerobic membrane bioreactors; membrane fouling; mean cell residence time; wastewater treatment; kinetic control
资金
- Mexican National Council on Science and Technology (CONACYT)
- Faculty of Engineering and the Environment at the University of Southampton
- ERA-NET Bioenergy/Biotechnology and Biological Sciences Research Council [BEN6-12-19, BB/L000024/1]
- BBSRC [BB/L000024/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/L000024/1] Funding Source: researchfish
Kinetic control of Mean Cell Residence Time (MCRT) was shown to have a significant impact on membrane flux under steady-state conditions. Two laboratory-scale flat-plate submerged anaerobic membrane bioreactors were operated for 245 days on a low-to-intermediate strength substrate with high suspended solids. Transmembrane pressure was maintained at 2.2 kPa throughout four experimental phases, while MCRT in one reactor was progressively reduced. This allowed very accurate measurement of sustainable membrane flux rates at different MCRTs, and hence the degree of membrane fouling. Performance data were gathered on chemical oxygen demand (COD) removal efficiency, and a COD mass balance was constructed accounting for carbon converted into new biomass and that lost in the effluent as dissolved methane. Measurements of growth yield at each MCRT were made, with physical characterisation of each mixed liquor based on capillary suction time. The results showed membrane flux and MLSS filterability was highest at short MCRT, although specific methane production (SMP) was lower since a proportion of COD removal was accounted for by higher biomass yield. There was no advantage in operating at an MCRT <25 days. When considering the most suitable MCRT there is thus a trade-off between membrane performance, SMP and waste sludge yield.
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