Abstract：
The electric field-assisted composting system (EACS) is an emerging technology that can enhance composting efficiency, but little attention has been given to electrode materials. Herein, an EACS was established to investigate the effects of electrode materials on humic substance formation and heavy metal speciation. Excitation-emission matrix analysis showed that carbon-felt and stainless-steel electrodes increased humic acid (HA) by 48.57 % and 47.53 %, respectively. In the EACS with the carbon-felt electrode, the bioavailability factors (BF) of Cu and Cr decreased by 18.00 % and 7.61 %, respectively. Despite that the stainless-steel electrodes decreased the BF of As by 11.26 %, the leaching of Cr, Ni, Cu, and Fe from the electrode itself is an inevitable concern. Microbial community analyses indicated that the electric field increased the abundance of Actinobacteria and stimulated the multiplication of heavy metal-tolerant bacteria. Redundancy analysis indicates that OM, pH, and current significantly affect the evolution of heavy metal speciation in the EACS. This study first evaluated the metal leaching risk of stainless-steel electrode, and confirmed that carbon-felt electrode is environment-friendly material with high performance and low risk in future research with EACS.
摘要：
电场辅助堆肥系统（EACS）是一种新兴的技术，可以提高堆肥效率，但很少关注电极材料。在这里，建立了EACS来研究电极材料对腐殖质形成和重金属形态的影响。激发-发射基质分析表明，碳毡和不锈钢电极使腐殖酸（HA）分别增加了48.57％和47.53％，分别。在使用碳毡电极的EACS中，Cu和Cr的生物有效性因子(BF)分别降低了18.00%和7.61%,分别。尽管不锈钢电极使As的BF降低了11.26%，Cr的浸出，Ni,Cu,和电极本身的铁是一个不可避免的问题。微生物群落分析表明，电场增加了放线菌的丰度，并刺激了重金属耐受细菌的繁殖。冗余分析表明，OM，pH值,和电流显著影响EACS中重金属形态的演变。本研究首先评估了不锈钢焊条的金属浸出风险，并在未来的EACS研究中证实了碳毡电极是高性能、低风险的环保材料。
