Correlation of physicochemical properties and sludge dewaterability under chemical conditioning using inorganic coagulants

被引：269

作者：

Niu, Meiqing ^{[1
,2
]}

Zhang, Weijun ^{[1
]}

Wang, Dongsheng ^{[1
]}

Chen, Yu ^{[2
]}

Chen, Ronglai ^{[2
]}

机构：

[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China

[2] Beijing Mill Water Cleaning Agent Co Ltd, Beijing 100018, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2013年 / 144卷

关键词：

Chemical conditioning; EPS; Inorganic coagulants; Physicochemical properties; Sludge dewaterability; EXTRACELLULAR POLYMERIC SUBSTANCES; ACTIVATED-SLUDGE; FLOCS; EPS; FLOCCULATION; MECHANISMS; SIZE;

D O I：

10.1016/j.biortech.2013.06.126

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

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.

引用

页码：337 / 343

页数：7

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