期刊
CHEMOSPHERE
卷 290, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.133371
关键词
Sewage sludge; Biochar; ZnCl2 impregnation; Co-pyrolysis; Camellia oleifera shell; Heavy metals
资金
- Nature Science Research Project of Anhui Province [2008085QC139]
- Natural Science Foundation of the Education Department of Anhui Province [KJ2019A0207]
- Anhui Science and Technology Major Project [18030701186]
- Open Fund of Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention [FECPP202003]
- Project Startup Foundation for Advanced Talents AHAU [YJ2018-56]
- College Students' Innovative Entrepreneurial Training Plan Program [202110364670]
This study investigated the synergetic effect of co-pyrolysis and ZnCl2 impregnation treatment on the surface characteristics and potential ecological risk of heavy metals in sewage sludge derived biochar. The results showed that ZnCl2 impregnation increased biochar yield and the content of O and S, but decreased ash content and pH. Furthermore, ZnCl2 impregnation also decreased the thermal stability of biochar.
Sewage sludge derived biochar has great potential for agricultural application, whereas the risk of heavy metals in sewage sludge is a key challenge for utilization. This study investigated the synergetic effect of co-pyrolysis and ZnCl2 impregnation treatment on the surface characteristics and potential ecological risk of heavy metals in sewage sludge derived biochar. It was concluded that ZnCl2 impregnation led to an increase in biochar yield, O and S content, but decrease the ash content and pH. Additionally, the thermal stability of ZnCl2-added biochar was decreased. Semi-quantitive specific functional groups analysis suggested that ZnCl2 impregnation had a negative effect on the content of C = O and C-O, while promoted the formation of aromatic C = C. And the functional group of C = O was retained in biochar by co-pyrolysis with Camellia oleifera shell due to its high content of potassium. For heavy metal passivation, ZnCl2 impregnation decreased total content of heavy metals by chlorination, while the oxidizable fraction (F3) of heavy metals showed an increasing tendency. Results of potential ecological risk assessment indicated that combining ZnCl2 impregnation and co-pyrolysis had great potential to reduce the ecological risk of heavy metals in sewage sludge derived biochar.
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