Electrokinetic treatment at the thermophilic stage achieves more effective control of heavy metal resistance in swine manure composting

文献类型： 外文期刊

第一作者： Li, Binxu

作者： Li, Binxu;Zhang, Xu;Song, Tingting;Sardar, Muhammad Fahad;Shi, Yuchang;Zhu, Changxiong;Li, Hongna;Song, Tingting;Sardar, Muhammad Fahad;Zhu, Changxiong

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关键词： Electrokinetic; Thermophilic stage; Heavy metal resistance; Swine manure

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.4； 五年影响因子：8.6 ）

ISSN： 0301-4797

年卷期： 2025 年 390 卷

页码：

收录情况： SCI

摘要： Excessive heavy metals (HMs) and metal resistance genes (MRGs) in manure pose significant environmental and human health risks. Our previous work proved enhanced control of antibiotic resistance and quality of swine manure composting with electrokinetic technology (EK). As a continuous study, EK treatments were further employed at typical stages of composting. The humification level increased significantly in EK treatments applied at the thermophilic stage (EK1) and throughout the whole composting period (EK2). The immobilization efficiency of heavy metals increased by 3.02 %-20.90 % for EK1, and 3.86 %-20.56 % for EK2, compared with the EK treatment applied at maturity stage (EK3). EK1 showed the highest ability to remove MRGs (29.38 %-87.13 %), while the abundance of potential host bacteria increased in EK2, raising potential transmission risk of MRGs. Furthermore, there was an elevated presence of bacteria associated with membrane transport as a response mechanism to HMs stress in EK1. Considering economic factors and environmental effects, EK treatment during the thermophilic stage was more effective in compost maturation, HMs passivation, as well as control of HMs resistance. This study provides an effective method to address HMs-related contamination with highly efficient maturation in swine manure composting.

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