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Research articles

ScienceAsia 48 (2022):ID 782-787 |doi: 10.2306/scienceasia1513-1874.2022.120

Transformation of heavy metals via sludge composite conditioning

Sen Wanga,b,*, WanKun Xua, Pei Yia,b, JiaoJiao Yuana, Meng Lia, Fang Sua, Wen Shena,c

ABSTRACT:     To investigate the distribution of heavy metals and their morphological transformation during sludge treatment, sludge was conditioned by the persulfate method and combined with papermaking sludge. The removal rates, distribution and morphological transformation of the heavy metals Cd, Cr, Cu, Pb and Zn were analyzed. The results showed that the concentrations of heavy metals in residual sludge were all reduced to different degrees after persulfate conditioning. The Zn removal rate was highest, reaching 33.90%. After compound conditioning, the heavy metal removal rate was reduced, mainly because of the heavy metals contained in papermaking sludge. Heavy metal removal followed the order Zn > Cu > Cr > Pb > Cd. After compound conditioning, heavy metals were mainly concentrated in the filter cake; Cd and Zn mainly occurred in unstable forms and Cr, Cu, and Pb in stable forms.

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a School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi?an 710021 China
b China Light Industry Water Pollution Control Engineering Center, Xi?an 710021 China
c Shaanxi Research Institute of Agricultural Products Processing Technology, Xi?an 710021 China

* Corresponding author, E-mail: wangsen@sust.edu.cn

Received 2 Aug 2021, Accepted 10 Jun 2022