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Wang, Zhaozhao
- Pilot-Scale Submerged Hollow Fibre Membrane Bioreactor Thickening Operation: Membrane Clogging, Sustainable Flux and Sludge Characteristics Assessment
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Authors
Affiliations
1 College of Energy and Environmental Engineering, Hebei University of Engineering, Handan, 056038, CN
2 Graduate School, Hebei University of Engineering, Handan, 056038, CN
1 College of Energy and Environmental Engineering, Hebei University of Engineering, Handan, 056038, CN
2 Graduate School, Hebei University of Engineering, Handan, 056038, CN
Source
Nature Environment and Pollution Technology, Vol 17, No 1 (2018), Pagination: 261-268Abstract
The sludge characteristics and their impact on membrane clogging propensity and flux behaviours by statistical analyses were investigated in a pilot-scale hollow fiber membrane bioreactor during thickening operation at constant F/M ratio of 0.13. The cleaning efficiencies by chemical enhanced backflushing (CEB) and mechanical declogging at different mixed liquor suspended solids (MLSS) concentration and flux levels were further assessed through (post-cleaning) permeability decline rates. The results showed that MLSS concentration exerted the greatest impacts on the ratio of accumulated solids to mixed liquor solids loading (ΔK) and sustainable flux (JSUS), and its measurement could be used to predict both ΔK and JSUS, with a strong correlation between ΔK and JSUS observed. Moreover, membrane permeability recovery exhibited strong dependence on MLSS concentration and operational flux. On the premise of sub-critical flux operation, the recovered permeability can be sustained with a standard chemical enhanced backflushing (CEB) or declogging combined CEB at low (~8 g/L) or high (20-32 g/L) MLSS concentrations. However, the recovered permeability could only be obtained instantaneously regardless of cleaning modes when operation is exposed to super-critical flux condition, indicating the significance of the operational flux on membrane permeability sustainability.Keywords
Membrane Bioreactor, Clogging, Sustainable Flux, Sludge Characteristics, Cleaning.Full Text
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