title: Dynamic behavior and concentration distribution of granular sludge in a super-high-rate spiral anaerobic bioreactor.
abstract: Dynamic behavior and concentration distribution of granular sludge is highly dependent on the ecological environment of microbial communities and substrate degradation efficiency along bed height. Both were modeled and verified through experiments in a super-high-rate spiral anaerobic bioreactor (SSAB). The sludge transport efficiency of upmoving biogas (k(t),(n)(-1)) displaying dynamic behavior of granular sludge in SSAB were predicted and found to be much lesser than of upflow anaerobic sludge blanket (UASB). The bed concentration distribution (C(m),(n)(-1)/C(m),(n)) which represented concentration distribution of granular sludge were also quantitatively predicted in two feeding strategies. Parametric sensitivity suggested that k(t),(n)(-1) was significantly influenced by spiral angle, outer radii of spiral rectangular channel, settling velocity of granular sludge and superficial liquid velocity (v(l)), while C(m),(n)(-1)/C(m),(n) was affected by v(l) and superficial biogas velocity. In addition, some measures were also suggested to optimize designs and operations of such bioreactors.
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China. cxg@dhu.edu.cn
authors.forename: Xiao-Guang
authors.initials: XG
authors.lastname: Chen
authors.forename: Ping
authors.initials: P
authors.lastname: Zheng
authors.forename: Mahmood
authors.initials: M
authors.lastname: Qaisar
authors.forename: Chong-Jian
authors.initials: CJ
authors.lastname: Tang
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors; D012722:Sewage
chemical_list: D056804:Biofuels; D012722:Sewage