Migration, transformation and risk assessment of heavy metals in municipal sludge treated by thermal hydrolysis

被引：0
|
作者：
Fu J. [1 ]
Qiu C. [1 ,2 ]
Wang C. [1 ,2 ]
Zheng J. [1 ]
Liu N. [1 ,2 ]
Wang D. [1 ,2 ]
Wang S. [1 ,2 ]
Sun L. [1 ,2 ]
机构：
[1] School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin
[2] Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 04期
关键词：
Environmental risk; Heavy metals; Sludge; Thermal hydrolysis;
D O I：
10.16085/j.issn.1000-6613.2021-0921
中图分类号：
学科分类号：
摘要：
The effects of different temperatures (120-200℃) and treatment times (15-90min) on the migration transformation and environmental risks of heavy metals (Cr, Mn, Ni, Cu, Cd and Pb) in sludge were investigated by analyzing the changes of heavy metal content and morphology during sludge thermal hydrolysis treatment, and the correlation between physicochemical parameters (VS, soluble protein, polysaccharide, SCOD, alkalinity, ammonia-N, and pH) and changes of heavy metal bioavailability was analyzed. The results showed that the sludge was effectively cracked by thermal hydrolysis, and some of the heavy metals were released into liquid phase, but most of them remained in solid phase. The contents of Cr and Mn in the solid phase increased at higher treatment temperatures (≥180℃) compared to those in the original sludge, while the contents of other heavy metals decreased. Most of the heavy metals (except Pb) in weak acid extracted fraction in sludge showed a decreasing trend with increasing temperature and prolonged time after thermal hydrolysis treatment, while Cr, Ni, Cu, Cd and Pb in residue fraction increased significantly after treatment. The contents of bioavailable heavy metals were strongly correlated to indicators such as ammonia-N, SCOD, soluble protein, and VS. The ecological risk of individual heavy metal was closely related to its migration and transformation, and the risk index of total potential ecological risk of heavy metals in sludge was significantly reduced after thermal hydrolysis treatment. © 2022, Chemical Industry Press Co., Ltd. All right reserved.
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页码：2216 / 2225
页数：9
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