Page 69 - 2016地大报告-电子书

环境学院发展报告

5. Improvement of wastewater sludge dewatering performance using titanium salt

coagulants (TSCs) in combination with magnetic nano-particles: significance of titanium
speciation

作 者：Zhang, WJ ( 张伟军) [ 1 ] ; Chen, Z (Chen, Zhan) [ 2,4 ] ; Cao, BD (Cao, Bingdi)
[ 2 ] ; Du, YJ (Du, Youjing) [ 2,3 ] ; Wang, CX (Wang, Caixia) [ 2 ] ; Wang, DS (Wang, Dongsheng)

[ 2,3 ] ; Ma, T (Ma, Teng) [ 1 ] ; Xia, H (Xia, Hua) [ 3 ]
WATER RESEARCH 卷 : 110 页 : 102-111 出版年 : MAR 1 2017

摘 要 ：In this study, the effects of chemical conditioning using titanium salt coa
gulants (TSCs) of different hydrolysis speciation in combination withmagnetic nano-

particles on dewatering performance of waste activated sludge were evaluated by
means of specific resistance to filtration (SRF) and capillary suction time (CST). The

morphological and extracellular polymeric substances (EPS) properties under chemical
conditioning were investigated in detail to understand the reaction mechanisms involved.

The results showed that the TSC with basicity of 0.5 performed better inimproving sludg
e dewatering performance than other TSCs. Sludge floc formed by TSC0.5 treatment was

characterized by larger floc size and higher floc strength than that conditioned by other TSCs.
EPS compression and densification were the major mechanisms of sludge conditioning

, and TSC0.5 had better performance in compressi
ng EPS structure. In addition, reduction of soluble

EPS concentration, especially protein-like substances
contributed to improvement of sludge filterability

under conditioning. Furthermore, addition of Fe2O3
nanoparticles could further improvedewatering perf

ormance and decrease compressibility of sludge syst
em by acting as skeleton builders and enhancing floc

strength. The sludgeparticles aggregation efficiency
was effectively improved with addition of nano-Fe2O3.

They also were able to bind with protein-like substance in EPS component, which might
contribute to promotion of sludge filterability. (C) 2016 Elsevier Ltd. All rights reserved.

论文链接：https://doi.org/10.1016/j.watres.2016.12.011
6.In situ Fe-sulfide coating for arsenic removal under reducing conditions

作 者 ： Xie, XJ (谢先军) [ 1,2 ] ; Liu, YQ (Liu, Yaqing) [ 1,2 ] ; Pi, KF (Pi, Kunfu) [ 1,2 ] ; Liu,

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