期刊
BIORESOURCE TECHNOLOGY
卷 144, 期 -, 页码 337-343出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.06.126
关键词
Chemical conditioning; EPS; Inorganic coagulants; Physicochemical properties; Sludge dewaterability
资金
- State Water Project for Integrated Water Supply Sludge Quality and Depth of Dewatering Technology [2012ZX07408001-05]
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. (C) 2013 Published by Elsevier Ltd.
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