title: Correlation of physicochemical properties and sludge dewaterability under chemical conditioning using inorganic coagulants.
abstract: This study investigated the effects of chemical conditioning with three representative inorganic coagulants (FeCl3, polyaluminum chloride (PACl) and high performance PACl (HPAC) on sludge dewaterability. We monitored the particle size, kinetic viscosity (KV), fractal dimension (D(F)) and extracellular polymeric substances (EPS) located in different layers of sludge floc (soluble, loosely-bound (LB), tightly-bound (TB)) to understand the correlation of dewaterability and physicochemical properties of sludge under chemical conditioning. The conditioning process included the rapid aggregation of sludge particles induced by charge neutralization and bridging followed by floc densification caused by double electric layer compression. The floc size and D(F) were increased after chemical conditioning, indicating that larger and more compact floc formed. The floc conditioned with FeCl3 was smaller but denser than that of PACl and HPAC. Furthermore, sludge dewaterability correlated well with the change in concentration of soluble EPS, LB-EPS and TB-EPS, but not with KV, D(F), floc size.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Meiqing
authors.initials: M
authors.lastname: Niu
authors.forename: Weijun
authors.initials: W
authors.lastname: Zhang
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.forename: Ronglai
authors.initials: R
authors.lastname: Chen
mesh_terms: D001704:Biopolymers / Q000737:chemistry; D055598:Chemical Phenomena; D005374:Filtration; D005427:Flocculation; D007287:Inorganic Chemicals / Q000737:chemistry*; D007700:Kinetics; D008970:Molecular Weight; D010316:Particle Size; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D014783:Viscosity; D014867:Water / Q000737:chemistry*
chemical_list: D001704:Biopolymers; D007287:Inorganic Chemicals; D012722:Sewage; D014867:Water
keywords: Chemical conditioning; EPS; Inorganic coagulants; Physicochemical properties; Sludge dewaterability