Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
679258 | Bioresource Technology | 2016 | 9 Pages |
Abstract
The differences between biofilm and suspended sludge (S-sludge) in extracellular polymeric substances (EPS), microbial activity, and microbial community in an anoxic-aerobic sequencing batch biofilm reactor (SBBR) at different concentrations of divalent cadmium (Cd(II)) were investigated. As the increase of Cd(II) concentration from 0 to 50 mg Lâ1, the specific ammonium oxidation rate (SAOR), specific nitrite oxidation rate (SNOR), and specific nitrate reduction rate (SNRR) of biofilm decreased from 4.85, 5.22 and 45 mg N gâ1 VSS hâ1 to 1.54, 2.38 and 26 mg N gâ1 VSS hâ1, respectively, and the SAOR, SNOR and SNRR of S-sludge decreased from 4.80, 5.02 and 34 mg N gâ1 VSS hâ1 to 1.46, 2.20 and 17 mg N gâ1 VSS hâ1, respectively. Biofilm had higher protein (PN) content in EPS than S-sludge. Contrast to S-sludge, biofilm could provide Nitrobacter vulgaris, beta proteobacterium INBAF015, and Pseudoxanthomonas mexicana with the favorable conditions of growth and reproduction.
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Authors
Zichao Wang, Mengchun Gao, Junfeng Wei, Kedong Ma, Jing Zhang, Yusuo Yang, Shuping Yu,