The migration and transformation behavior of heavy metals during the liquefaction process of sewage sludge

被引：116
|
作者：
Leng, Lijian [1 ,2 ]
Yuan, Xingzhong [1 ,2 ]
Huang, Huajun [3 ]
Jiang, Hongwei [1 ,2 ]
Chen, Xiaohong [4 ]
Zeng, Guangming [1 ,2 ]
机构：
[1] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China
[3] Jiangxi Agr Univ, Sch Land Resources & Environm, Nanchang 330045, Peoples R China
[4] Cent S Univ, Sch Business, Changsha 410083, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2014年 / 167卷
基金：
中国国家自然科学基金;
关键词：
Sewage sludge; Liquefaction; Heavy metal; Bio-oil; Bio-char; BIO-OIL PRODUCTION; HYDROTHERMAL LIQUEFACTION; QUANTITATIVE-EVALUATION; WOOD SLUDGE; TEMPERATURE; EXTRACTION; SPECIATION; CONVERSION; BIOMASS; IMMOBILIZATION;
D O I：
10.1016/j.biortech.2014.05.119
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Bio-oils and bio-chars were obtained from sewage sludge (SS) by liquefaction with ethanol (or acetone) as the solvent at the temperature of 280, 320 and 360 degrees C. The migration and transformation of HMs as Pb, Zn, Cu and Ni during liquefaction were thoroughly investigated. Meanwhile, the environmental risk of HMs in the bio-oils and bio-chars was assessed according to the risk assessment code (RAC). The results showed that the liquefaction solvent and temperature significantly affected the redistribution of HMs. HMs distributed mainly into the bio-chars, with less than 10% into the bio-oils. Increasing liquefaction temperature would promote a higher HM content in bio-oils. The environmental risk of HMs in bio-chars was mitigated compared to SS, especially for Ni. However, the environmental risk of Zn and Ni in bio-oils was undesirably high in comparison with bio-chars. It was suggested that the bio-oil should be pretreated before utilization. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：144 / 150
页数：7
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