Research on the stability of heavy metals (Cu, Zn) in excess sludge with the pretreatment of thermal hydrolysis

被引：19

作者：

Wu, Huimin ^{[1
]}

Li, Meng ^{[1
]}

Zhang, Lei ^{[1
]}

Sheng, Chao ^{[1
]}

机构：

[1] Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China

来源：

WATER SCIENCE AND TECHNOLOGY | 2016年 / 73卷 / 04期

关键词：

heavy metals; optimal conditions; stability; thermal hydrolysis; SEQUENTIAL EXTRACTION; SEWAGE-SLUDGE; METALLOTHIONEIN; BEHAVIOR;

D O I：

10.2166/wst.2015.537

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Thermal hydrolysis (TH) has been used to improve anaerobic digestion performance as well as the stability of heavy metals in sludge. Because the toxicity of heavy metals is closely related to both the concentration and the chemical speciation, more exhaustive studies on speciation distribution are urgently needed. This research aimed to investigate the effects of TH treatment (especially the time and temperature) on the concentration and stability of heavy metals in sludge, and to define the optimal TH conditions. The TH experiment indicated that the content of the stable form of Cu and Zn reached 83% and 47.4%, respectively, with TH at 210 degrees C and 30 min. Compared with the raw sludge, the proportion of Cu and Zn increased by 11.88% and 7.3%, respectively. Results indicated that the heavy metals were combined with sludge in a more stable form with the pretreatment of TH, which improved the stability of heavy metals.

引用

页码：890 / 898

页数：9

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