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| Formation of SMP during denitrification under anoxic conditions in a membrane bioreactor |
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Abstract The formation of soluble microbial products (SMP) with various C/N ratios under anoxic condition in membrane bioreactors was analyzed. In the process of denitrification at different C/N ratio, SMP concentration increased gradually due to the substrate utilization. The SMP concentration accumulated in the batch tests at high C/N ratio (9~10mgCOD/gVSS), which was higher than that at low C/N ratio (3~4mgCOD/gVSS). The analysis of SMP components showed the polysaccharide metabolism was similar at different C/N ratios, whereas the concentration of protein in total SMP increased with the increase of C/N ratio, and became the major potential contributor to membrane fouling. The results also demonstrated that nitrite accumulation under anoxic conditions had no obvious effects on the formation of SMP in the denitrification process.
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Received: 13 December 2011
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