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Effects of co-pyrolysis of rice husk and sewage sludge on the bioavailability and environmental risks of Pb and Cd
Version 2 2020-01-07, 05:58
Version 1 2019-12-07, 06:35
journal contribution
posted on 2020-01-07, 05:58 authored by Yan-Qin Yang, Min-Hua Cui, Jian-Chao Guo, Jing-Jing Du, Zhi-Yong Zheng, He LiuIn this study, biochars were produced by co-pyrolysis of rice husk and sewage sludge, the environmental risk of heavy metal (Pd and Cd) in the biochars was assessed. Co-pyrolysis resulted in a lower yield but a higher C content compared with sewage sludge pyrolysis alone, the relative contents of Pb and Cd in biochars were declined. Co-pyrolysis process transformed the bioavailable heavy metals into stable speciation. The environmental risk assessment codes of Pb and Cd were reduced by 1–2 grades. The co-pyrolysis technology provides a feasible method for the safe disposal of heavy metal-contaminated sewage sludge.