metagenomic sequencing_D (CRX1726474; CRA025828)
Metagenomic and metatranscriptomic sequencing was performed on microbial communities from groups with and without magnetite addition, under 0.25 mg/L DO. After disassembling the reactors, the cathode surface was gently rinsed with deionized water to remove impurities and then rapidly frozen in liquid nitrogen before being sent to Majorbio Bio-Pharm Technology Co., Ltd. (Shanghai, China) for sequencing.