Microbial community developments and biomass characteristics in membrane bioreactors under different organic loadings
Microbial community developments and biomass characteristics (concentration, particle size, extracellular polymeric substances (EPS), and membrane fouling propensity) were compared when three MBRs were fed with the synthetic wastewater at different organic loadings. Results showed that...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2011
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/94044 http://hdl.handle.net/10220/7196 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Microbial community developments and biomass characteristics (concentration, particle size, extracellular
polymeric substances (EPS), and membrane fouling propensity) were compared when three MBRs were fed
with the synthetic wastewater at different organic loadings. Results showed that the bacterial communities
dynamically shifted in different ways and the EPS displayed dissimilar profiles under various organic loadings,
which were associated with the ratios of food to microorganism and dissolved oxygen levels in the
MBRs. The membrane fouling tendency of biomass in the low-loading MBR (0.57 g COD/L day) was insignificantly
different from that in the medium-loading MBR (1.14 g COD/L day), which was apparently lower
than that in the high-loading MBR (2.28 g COD/L day). The membrane fouling propensity of biomass was
strongly correlated with their bound EPS contents, indicating cake layer fouling (i.e., deposition of microbial
flocs) was predominant in membrane fouling at a high flux of 30 L/m2 h. |
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