title: Shock resistance characteristic of a spiral symmetry stream anaerobic bio-reactor.
abstract: The shock resistance characteristic (SRC) of an anaerobic bioreactor characterizes the ability of the anaerobic community in the reactor to withstand violent change in the living environment. In comparison with an upflow anaerobic sludge blanket reactor (UASBR), the SRC of a spiral symmetry stream anaerobic bio-reactor (SSSAB) was systematically investigated in terms of removal efficiency, adsorption property, settling ability, flocculability and fluctuations in these parameters. A quantitative assessment method for SRC was also developed. The results indicated that the SSSAB showed better SRC than the UASBR. The average value (m value) of chemical oxygen demand removal rates of the SSSAB was 86.0%. The contact angle of granules in the SSSAB present gradient distribution, that is the m value of contact angle increasing from bottom (84.5°) to top (93.9°). The m value of the density at the upper and lower sections of the SSSAB were 1.0611 g·cm(-3) and 1.0423 g·cm(-3), respectively. The surface mean diameter of granules in the SSSAB increased from 1.164 to 1.292 mm during operation. The absolute m value of zeta potential of granular sludge at the upper and lower sections of the SSSAB were 40.4 mV and 44.9 mV, respectively. The weighted mean coefficient variance (C̅V̅) value indicated SSSAB was more stable than the UASBR.
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Room 4161, 2999 Renmin North Road, Songjiang District, Shanghai 201620, China E-mail: cxg@dhu.edu.cn; State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Room 4161, 2999 Renmin North Road, Songjiang District, Shanghai 201620, China.
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Chen
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Room 4161, 2999 Renmin North Road, Songjiang District, Shanghai 201620, China E-mail: cxg@dhu.edu.cn.
authors.forename: Ruobin
authors.initials: R
authors.lastname: Dai
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Room 4161, 2999 Renmin North Road, Songjiang District, Shanghai 201620, China E-mail: cxg@dhu.edu.cn.
authors.forename: Xinyi
authors.initials: X
authors.lastname: Xiang
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Room 4161, 2999 Renmin North Road, Songjiang District, Shanghai 201620, China E-mail: cxg@dhu.edu.cn.
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Room 4161, 2999 Renmin North Road, Songjiang District, Shanghai 201620, China E-mail: cxg@dhu.edu.cn.
authors.forename: Zhengqi
authors.initials: Z
authors.lastname: Xu
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Room 4161, 2999 Renmin North Road, Songjiang District, Shanghai 201620, China E-mail: cxg@dhu.edu.cn.
authors.forename: Tao
authors.initials: T
authors.lastname: Hu
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Room 4161, 2999 Renmin North Road, Songjiang District, Shanghai 201620, China E-mail: cxg@dhu.edu.cn.
authors.forename: Awad
authors.initials: A
authors.lastname: Abdelgadir
mesh_terms: D000327:Adsorption; D000693:Anaerobiosis; D001419:Bacteria / Q000737:chemistry / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D012722:Sewage / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
chemical_list: D012722:Sewage