title: Extracellular polymeric substances, microbial activity and microbial community of biofilm and suspended sludge at different divalent cadmium concentrations.
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.
authors.affiliation: 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.
authors.forename: Zichao
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, China.
authors.forename: Mengchun
authors.initials: M
authors.lastname: Gao
authors.affiliation: College of Environment and Chemical Engineering, Dalian University, Dalian, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Wei
authors.affiliation: College of Environment and Chemical Engineering, Dalian University, Dalian, China.
authors.forename: Kedong
authors.initials: K
authors.lastname: Ma
authors.affiliation: College of Environment and Chemical Engineering, Dalian University, Dalian, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: College of Environment and Chemical Engineering, Dalian University, Dalian, China.
authors.forename: Yusuo
authors.initials: Y
authors.lastname: Yang
authors.affiliation: College of Environment and Chemical Engineering, Dalian University, Dalian, China.
authors.forename: Shuping
authors.initials: S
authors.lastname: Yu
mesh_terms: D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development; D019149:Bioreactors / Q000382:microbiology*; D002104:Cadmium / Q000633:toxicity*; D059013:Microbial Consortia / Q000187:drug effects / Q000502:physiology*; D009566:Nitrates / Q000737:chemistry / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism; D010084:Oxidation-Reduction; D011134:Polysaccharides / Q000378:metabolism; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000633:toxicity
chemical_list: D009566:Nitrates; D009573:Nitrites; D011134:Polysaccharides; D012722:Sewage; D014874:Water Pollutants, Chemical; D002104:Cadmium; D009584:Nitrogen
keywords: Biofilm; Divalent cadmium; Extracellular polymeric substances; Microbial community; Suspended sludge