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Bioresour Technol. 2016 Apr;205:213-21. doi: 10.1016/j.biortech.2016.01.067. Epub 2016 Jan 25.

Extracellular polymeric substances, microbial activity and microbial community of biofilm and suspended sludge at different divalent cadmium concentrations.

Author information

1
College of Environment and Chemical Engineering, Dalian University, Dalian, China; Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, China. Electronic address: wangzch@outlook.com.
2
Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, China.
3
College of Environment and Chemical Engineering, Dalian University, Dalian, China.

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 50mgL(-1), 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 45mgNg(-1) VSSh(-1) to 1.54, 2.38 and 26mgNg(-1)VSSh(-1), respectively, and the SAOR, SNOR and SNRR of S-sludge decreased from 4.80, 5.02 and 34mgNg(-1)VSSh(-1) to 1.46, 2.20 and 17mgNg(-1)VSSh(-1), 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.

KEYWORDS:

Biofilm; Divalent cadmium; Extracellular polymeric substances; Microbial community; Suspended sludge

PMID:
26829529
DOI:
10.1016/j.biortech.2016.01.067
[Indexed for MEDLINE]

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