Combining impregnation and co-pyrolysis to reduce the environmental risk of biochar derived from sewage sludge

文献类型： 外文期刊

第一作者： Min, Xue

作者： Min, Xue;Li, Hui;Shi, Yanhong;Sheng, Bixuan;Li, Huaiyan;Ge, Tao;Fang, Ting;Dong, Xinju

作者机构：

关键词： Sewage sludge; Biochar; ZnCl2 impregnation; Co-pyrolysis; Camellia oleifera shell; Heavy metals

期刊名称：CHEMOSPHERE （ 影响因子：8.943； 五年影响因子：8.52 ）

ISSN： 0045-6535

年卷期： 2022 年 290 卷

页码：

收录情况： SCI

摘要： 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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