title: An experimental study of low concentration sludge settling velocity under turbulent condition.
abstract: Particle Image Velocimetry (PIV) was used to study the settling of activated sludge flocs under turbulent flow conditions. Experimental results showed that a larger particle diameter led to a higher settling velocity while the higher turbulence intensity led to lower settling velocity. Based on the measurements a mathematical relation has been derived which correlates the settling velocity for individual sludge flocs under turbulent conditions through a modified Vesilind equation. Settling velocity shows a power-type relation to sludge particle diameter and an exponential-type relation with turbulence intensity and sludge concentration.
authors.affiliation: Department of Environmental Science, Chongqing University, Chongqing, China.
authors.forename: Lisha
authors.initials: L
authors.lastname: Guo
authors.forename: Daijun
authors.initials: D
authors.lastname: Zhang
authors.forename: Danyu
authors.initials: D
authors.lastname: Xu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Chen
mesh_terms: D010316:Particle Size; D012212:Rheology / Q000379:methods; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage