Pyrolysis-induced migration and transformation of heavy metals in sewage sludge containing microplastics

Chang, Xinyi1; Wu, Pengfei2; Chu, Yaozhu3; Zhou, Ying4; Tang, Yuanyuan1

2024-12-01

10.1016/j.wasman.2024.08.039

WASTE MANAGEMENT   影响因子和分区

0956-053X

1879-2456

Stabilizing heavy metals (HMs) in sewage sludge is urgently needed to facilitate its recycling and reuse. Pyrolysis stands out as a promising method for not only stabilizing these metals but also producing biochar. Our research delves into the migration and transformation of specific HMs (Cr, Mn, Ni, Cu, Zn, As, and Pb) during co-pyrolysis under various conditions, including the presence and absence of microplastics (PVC and PET). We examined different concentrations of these plastics (1 %, 5 %, 10 %, and 15 %) and temperatures (300 degrees C, 500 degrees C, and 700 degrees C). Findings reveal that microplastics, particularly PVC, enhance the migration of Zn and Mn, leading to significant volatilization of Zn and Pb at higher temperatures, peaking at 700 degrees C. The increase in temperature also markedly influences HM migration, with As showcasing notable loss rates that climbed by 18.0 % and 16.3 % in systems with PET and PVC, respectively, as temperatures soared from 300 degrees C to 700 degrees C. Moreover, our speciation analysis indicates that microplastics aid in transforming certain HMs from unstable to more stable forms, suggesting their beneficial role in HM stabilization during pyrolysis. This study significantly enriches our understanding of microplastics' impact on HM behavior in sewage sludge pyrolysis, offering new avenues for pollution control and environmental management strategies.

Sewage Sludge Stabilization of heavy metals Microplastics Pyrolysis Speciation

SCI

英语

第一 ; 通讯

Natural Science Foundation of Guangdong Province[2021B1515020041] ; National Natural Science Foundation of China["42277403","22106130"] ; Projects of International Cooperation and Exchange of the National Natural Science Foundation of China[NSFC-UNEP: 32261143459] ; Guangdong Major Project of Basic and Applied Basic Research[2023B0303000024] ; Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control[2023B1212060002] ; High-level University Special Fund[G03050K001]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:001308595900001

PERGAMON-ELSEVIER SCIENCE LTD

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Guangdong Prov Key Lab Soil & Groundwater Pollut C, Shenzhen 518055, Peoples R China
2.Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, State Key Lab Tree Genet & Breeding, Nanjing 210037, Peoples R China
3.Univ New South Wales, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia
4.Beijing Normal Univ, Adv Inst Nat Sci, Ctr Water Res, Zhuhai 519087, Peoples R China

Chang, Xinyi,Wu, Pengfei,Chu, Yaozhu,et al. Pyrolysis-induced migration and transformation of heavy metals in sewage sludge containing microplastics[J]. WASTE MANAGEMENT,2024,189.

Chang, Xinyi,Wu, Pengfei,Chu, Yaozhu,Zhou, Ying,&Tang, Yuanyuan.(2024).Pyrolysis-induced migration and transformation of heavy metals in sewage sludge containing microplastics.WASTE MANAGEMENT,189.

Chang, Xinyi,et al."Pyrolysis-induced migration and transformation of heavy metals in sewage sludge containing microplastics".WASTE MANAGEMENT 189(2024).