微氧耦合电化学强化污水厌氧消化的除碳脱氮

Enhanced Process of Anaerobic Digestion by Microaeration Coupling with Electrochemistry for Carbon and Nitrogen Removal in Wastewater

传统污水厌氧消化处理技术同步除碳脱氮效率低下。针对这一问题,该研究提出了一种微氧耦合铁碳微生物电解池强化污水厌氧处理的技术。结果表明,在外加电压为0.6 V作用下,DO质量浓度为0.84 mg/L的微氧介入可明显提高反应器的厌氧消化甲烷化效能,且在低有机负荷运行下可同时提高除碳脱氮性能。其中,微氧介入的铁碳微生物电解池耦合厌氧反应器的平均甲烷产量最大提高至91.85 mL/d,是空白组的4.5倍,总氮去除率较空白组提高18.1%。16S rRNA高通量测序表明,微氧耦合铁电极可有效提高Petrimonas、Methanosarcina等微生物丰度,提升除碳脱氮功能菌丰度。

Anaerobic digestion is a traditional wastewater treatment technology with a bottleneck of simultaneous nitrogen removal and carbon removal.To address this issue,a technology of microaeration coupling with iron-carbon microbial electrolytic tank was proposed to enhance anaerobic treatment of wastewater in this paper.Results showed that the microaeration condition of 0.84 mg/L DO could improve the anaerobic digestion performance significantly under the applied voltage of 0.6 V,and it could still work under the low organic load rates.The maximum methane yield increased to 91.85 mL/d under the microaeration condition coupling with iron-carbon microbial electrolytic tank,which was 4.5 times of the control group.Also,the nitrogen removal rate increased by 18.1%compared with the control group.The 16S rRNA high-throughput sequencing technology revealed that the microaeration coupling with iron electrode could effectively promote the abundance of Petrimonas and Methanosarcina,and improved the abundance of bacteria with the function of carbon and nitrogen removal.