期刊
BIORESOURCE TECHNOLOGY
卷 256, 期 -, 页码 216-223出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.02.013
关键词
Pyrolysis; Sewage sludge char; Heavy metal; BCR sequential extraction; Risk assessment
资金
- National Natural Science Foundation of China [51368051, 51768061]
- Scientific Research Foundation for Changjiang Scholars of Shihezi University [CJXZ201501]
To investigate the influence of KOH activation on characteristics and environmental risk of heavy metals in chars, sludge was pyrolyzed with varying amount of KOH. The analyzation of characteristics and potential ecological risk evaluation of heavy metals were conducted by surface area analyzer, FTIR, XRD and BCR sequential extraction. The activated chars have higher surface area and lower content of silica compared to those without being activated. The activation of KOH promoted residual fraction of Cd, meanwhile, Zinc, Cr, Ni and Mn were converted to relatively unstable fractions (F2 and F3). The results of risk assessment indicated that the potential ecological risk level of Cd was reduced in activated chars, while risk level of Zn, Cr, Ni and Mn were increased after pyrolysis with KOH activation. The potential ecological risk of heavy metals in activated chars was further declined, and the risk level transformed from moderate to low.
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