中国环境科学

作者：夏大朋, 袁林江, 陈雪娇, 刘妍, 王景华, 马炎辰

单位：西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西北水资源与环境生态教育部重点实验室, 陕西 西安 710055

关键词：单室,生物阴极,自养反硝化,低碳氮比废水,铁阳极

基金：国家自然科学基金资助项目(51878538)

The denitrification and electricity generation efficiency of inorganic wastewater from iron anode biocathode single-chamber cells were investigated, and the dominant bacterial community structure of the biocathode was examined. The results showed that the internal resistance of the single-chamber cell was only 224.1 Ω under the condition of external 1000 Ω resistor and 40mg/L nitrate-nitrogen feed water, and the maximum power density reached 1.82W/m3 with the total nitrogen removal rate of 40%. After lowering the external resistance and nitrate-nitrogen load, the cell could be stably operated and treated inorganic wastewater with a nitrate-nitrogen load of 20mg/L under the external 200 Ω resistance, and the total nitrogen removal rate reached 95.8% within 2d. The maximum nitrate-nitrogen removal load was 0.0102kgNO3--N/(m3·d), which was a one-fold increase in nitrate-nitrogen removal load, indicating that the single-chamber iron-anode biocathode cell has a good capacity to remove low concentrations of nitrate-nitrogen in inorganic wastewaters. Analysis of the biocathode community showed that the diversity of the biocathode community was reduced compared with that of the inoculated sludge, and the absolute dominant genus was Thiobacillus, with a relative abundance of 40.8%, which was the main genus for cathodic electroautotrophic denitrification.

来源：2024年第11期

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