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- Title
Transformation of heavy metals via sludge composite conditioning.
- Authors
Sen Wang; WanKun Xu; Pei Yi; Jiao Jiao Yuan; Meng Li; Fang Su; Wen Shen
- 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.
- Subjects
HEAVY metals; SLUDGE conditioning; PAPERMAKING
- Publication
ScienceAsia, 2022, Vol 48, Issue 6, p782
- ISSN
1513-1874
- Publication type
Article
- DOI
10.2306/scienceasia1513-1874.2022.120