title: Rheological behaviors of anaerobic granular sludge in a spiral symmetry stream anaerobic bioreactor.
abstract: The rheological behaviors of the anaerobic granular sludge (AGS) in a spiral symmetry stream anaerobic bioreactor (SSSAB) were investigated. Shear-thinning behavior, thixotropic behavior, concentration-viscosity behavior and temperature-viscosity behavior were evaluated based on the constitutive equation of the AGS. The results indicated that the Herschel-Bulkley model was able to adequately describe the constitutive relation of AGS in the SSSAB. The AGS also showed shear-thinning behavior as well as thixotropic behavior. The critical shear rate and network strength of the AGS were 61.8 s(-1) and 497.0 W m(-3), respectively. The relationship between the apparent viscosity and the sludge concentration was illustrated and explained by the Woodcock formula. The relationship between apparent viscosity of the AGS and temperature could be modeled using the Arrhenius equation. The AGS was significantly thermo-sensitive and its mean energy of activation was 14.640 kJ mol(-1). Notably, it was necessary to consider such behaviors in the hydrodynamic modeling of SSSAB in which shear condition, sludge concentration and temperature were in non-uniform distribution.
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China E-mail: machengyu@dhu.edu.cn; State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, 2999 North Renmin 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, Shanghai 201620, China E-mail: machengyu@dhu.edu.cn.
authors.forename: Ruobin
authors.initials: R
authors.lastname: Dai
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China E-mail: machengyu@dhu.edu.cn.
authors.forename: Xinyi
authors.initials: X
authors.lastname: Xiang
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China E-mail: machengyu@dhu.edu.cn; State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, 2999 North Renmin Road, Songjiang District, Shanghai 201620, China.
authors.forename: Chengyu
authors.initials: C
authors.lastname: Ma
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China E-mail: machengyu@dhu.edu.cn.
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China E-mail: machengyu@dhu.edu.cn.
authors.forename: Tao
authors.initials: T
authors.lastname: Hu
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China E-mail: machengyu@dhu.edu.cn.
authors.forename: Zhengqi
authors.initials: Z
authors.lastname: Xu
authors.affiliation: College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China E-mail: machengyu@dhu.edu.cn.
authors.forename: Awad
authors.initials: A
authors.lastname: Abdelgadir
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D008962:Models, Theoretical; D012212:Rheology; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D014783:Viscosity; D014865:Waste Disposal, Fluid
chemical_list: D012722:Sewage