Give priority to abiotic factor of phosphate additives for pig manure composting to reduce heavy metal risk rather than bacterial contribution

文献类型： 外文期刊

第一作者： Wu, Juan

作者： Wu, Juan;Wu, Juan;Chen, Wenjie;Zhang, Kui;Zhan, Yabin;Ding, Guochun;Wei, Yuquan;Li, Ji;Chen, Wenjie;Zhang, Kui;Zhan, Yabin;Wu, Jing;Ding, Guochun;Wei, Yuquan;Li, Ji;Zhao, Zichao;Zhao, Zichao

作者机构：

关键词： Bacterial eco-network; Composting; Heavy metal speciation; Phosphate additives; Potential ecological risk

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.642； 五年影响因子：9.237 ）

ISSN： 0960-8524

年卷期： 2021 年 341 卷

页码：

收录情况： SCI

摘要： Phosphate additives especially superphosphate can reduce nitrogen loss, and increase phosphorus availability in composting. This study investigated the changes of different heavy metals fractions and their relationship with bacterial community and abiotic factors during pig manure composting with adding equimolar H3PO4, H2SO4 and K2HPO4. Results showed that both acidic and alkaline labile phosphate increased the potential ecological risk of heavy metals compared to control, but K2HPO4 decreased the accumulation of exchangeable Zn and Mn by 12% and 15% than that with H3PO4 and H2SO4 addition. Network analysis showed that K2HPO4 enhanced the proportion of negative links in bacterial species with heavy metals, but H3PO4 decreased the stability of bacterial network. Redundancy analysis demonstrated that pH was the key factor on metal speciation and risk with phosphate additives than bacterial role. The study presented theoretical basis for additive selection in controlling composting nitrogen fixation and environmental risk.

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