黄浩斌,成少安.单室空气阴极微生物燃料电池硝酸根去除系统的建立和性能研究[J].环境科学学报,2019,39(6):1739-1747
单室空气阴极微生物燃料电池硝酸根去除系统的建立和性能研究
- Development and performance of single-chamber microbial fuel cell denitrification systems
- 基金项目：国家自然科学基金（No.51478414）；国家重点研发计划项目（No.2016YFB0600505）；深圳经信委项目（No.swcy20150331010038）
- 黄浩斌
- 浙江大学能源清洁利用国家重点实验室, 杭州 310027
- 成少安
- 浙江大学能源清洁利用国家重点实验室, 杭州 310027
- 摘要：本文以单室空气阴极微生物燃料电池（Microbial Fuel Cell，MFC）处理含不同浓度硝酸根的模拟废水，研究了NO3--N初始浓度和开闭路培养方式对单室MFC的启动、硝酸根去除性能和产电性能的影响.结果表明，随着NO3--N初始浓度的提高，MFC的NO3--N平均去除速率达到稳定值所需时间增加，NO3--N平均去除速率提高.当NO3--N初始浓度为200 mg·L-1时，闭路组MFC的NO3--N平均去除速率达到（3.52±0.28）kg·m-3·d-1，高于相近条件下许多传统生物反应器的NO3--N平均去除速率.硝酸根去除过程主要发生在MFC运行周期的前期.硝酸根对阳极生物膜中主要产电菌Geobacter的生物量没有影响.当基质充足时，所有闭路组MFC的最大功率密度相近（~27 W·m-3）.闭路组MFC比开路组MFC具有更高的NO3--N去除速率，可能与其阳极生物膜具有电化学还原亚硝酸根能力和Thauera易在其阳极上富集有关.
- Abstract：Single-chamber air cathode microbial fuel cells (MFCs) were constructed to treat synthetic wastewater containing different concentrations of nitrate. The start-up, nitrate removal and electricity generation of single-chamber MFCs were investigated under closed-circuit (closed-circuit MFCs) or open-circuit (open-circuit MFCs) operation. It is found that increasing initial NO3--N concentration extended the time required for the MFCs to obtain the stable average NO3--N removal rate, but enhanced the average NO3--N removal rate. When the initial NO3--N concentration was 200 mg·L-1, the average NO3--N removal rate of the closed-circuit MFCs was up to (3.52±0.28) kg·m-3·d-1, which was higher than those of many traditional biological denitrification systems under similar conditions. Nitrate was reduced at the early stage of a cycle in the MFCs. The biomass of the dominant exoelectrogen Geobacter enriched at the anodes in the closed-circuit MFCs was not affected by nitrate. With sufficient substrate, the maximum power densities of all the closed-circuit MFCs were similar (~27 W·m-3). The NO3--N removal rate of the closed-circuit MFCs was higher than that of the open-circuit MFCs, which was probably attributed to the anode biofilm with characteristics of bioelectrochemical reduction of nitrite and high enrichment of Thauera in the closed-circuit MFCs.
