Effects of salinity on the characteristics of biomass and membrane fouling in membrane bioreactors
- Effects of salinity on the characteristics of biomass and membrane fouling in membrane bioreactors
- 장덕수; 황유훈; 신항식; 이원태
- Salinity; Membrane fouling; Membrane bioreactor; Biomass characteristics; PCR-DGGE
- Issue Date
- Bioresource technology
- VOL 141, 50-56
- This study investigated the effects of high salinity on the performance and membrane fouling of membrane
bioreactor (MBR) with saline wastewater. Synthetic wastewaters containing 5–20 g/L salts (NaCl)
were treated in identical lab-scale (7 L) MBRs monitoring removals of dissolved organic carbon (DOC) and
ammonia. Increase in salt concentrations did not significantly change the removal efficiency of DOC in the
MBRs. However, the ammonia removals decreased from 87% to 46% with increasing salt concentrations.
PCR-DGGE analysis indicated changes in the microbial communities’ composition due to high salinity;
and the changes in microbial composition in turn have affected the performance of the MBRs. Membrane
fouling was accelerated by the increased pore blocking resistance at higher salt concentrations. Analysis
results of physicochemical and biological characteristics of biomass (EPS, floc size, zeta potential) verified
the impacts of high salinity on the increased membrane fouling.
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