Membrane fouling in an anaerobic membrane bioreactor: Differences in relative abundance of bacterial species in the membrane foulant layer and in suspension
- Membrane fouling in an anaerobic membrane bioreactor: Differences in relative abundance of bacterial species in the membrane foulant layer and in suspension
- Gao, D.W.; Zhang, T.; Tang, CYY; Wu, W. M.; Wong, C. Y.; 이영행; Yeh, D. H.; Criddle, C. S.
- Membrane; Biofouling; MBR; Bacterial Species
- Issue Date
- Journal of membrane science
- VOL 364, NO 1-2, 331-338
- A laboratory anaerobic membrane bioreactors (AnMBRs) (10 L volume) was operated at 30 ℃ and fed
with artificial sewage containing 30% protein at COD loading rate 5.1 kg/f㎥-d to investigate membrane
fouling with two membranes. Biomass attached to the membrane surface and formed a foulant layer
on the membrane. The foulant layers from polyvinylidene fluoride ultrafiltration membranes coated
with PEBAX (cPVDF) and an uncoated polyetherimide (PEI) ultrafiltration membranes were analyzed
and compared to suspended biomass in the reactor, using terminal restriction fragments (T-RFs) of the
16S rRNA gene and a clone library. One species of OP11 bacteria was present at high relative abundance in
the foulant layers of both membranes. By contrast, Bacteroidetes and Firmicutes (LGC) species were present
at low relative abundance in the foulant layers but high relative abundance in the suspended biomass.
Similar differences were observed for other species. The results suggest that some minority species like
OP11 play a direct role in fouling by attaching to the membrane surface while others, including some
that likely play a major role in the metabolism of influent organics, play a less important or indirect role.
In the AnMBR, the EPS was predominately proteinaceous. EPS and microbial cells of the foulant layer
contributed to membrane fouling. The results also indicate that fouling of PEI was faster than cPVDF and
this reaffirm the importance of the membrane material in fouling.
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