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作 者:赵国智[1] 李文红[1] 田光明[1] 周欲飞[1] 杨治中[1]
机构地区:[1]浙江大学环境与资源学院,浙江杭州310058
出 处:《浙江大学学报(理学版)》2012年第6期659-665,共7页Journal of Zhejiang University(Science Edition)
基 金:国家水体污染控制与治理科技重大专项:小城镇污水处理装备化关键技术研究与示范(2008ZX07317-008)
摘 要:采用电化学生物膜法对模拟地下水中的硝酸盐污染进行去除,研究了温度、进水pH、水力停留时间(HRT)和电流强度对电极生物膜反应器(BER)反硝化脱氮性能的影响.研究结果表明:20d左右反应器成功启动,电镜扫描显示阴极表面被大量微生物覆盖;在13.6~34.0℃时,NO3--N的去除效率随温度升高而上升;BER对进水pH冲击具有较强的缓冲能力,在6.25~8.27内NO3--N的去除效率可保持在85%以上;最佳HRT为9h,此时NO3--N去除率不低于85%;电流强度从13mA提高到102mA过程中,NO3--N的去除率不断增加,最后保持稳定,电流强度为78~102mA时,反硝化效果较好,NO3--N去除率大于85%,且没有NO2--N的积累现象.过高的电流强度会加速阳极碳棒的溶解.A Biofilm Electrode Reactor was operated to remove the nitrate contamination in the simulated groundwater.The effects of temperature,influent pH,hydraulic retention time(HRT)and current on the denitrification of BER system was investigated.The results showed that the reactor could be successfully started up within about 20 days;the formation of biofilm on the surface of cathode was confirmed by scanning electron microscope;nitrate removal efficiency increased with the temperature range from 13.6 ℃ to 34.0 ℃;BER has strong buffering capacity on the shock of influent pH,and nitrate removal efficiency kept above 85% from pH 6.25~8.27;the optimal HRT was 9h,at which the nitrate removal efficiency was over 85%;the nitrate removal efficiency first increased and then kept stable with the current ranged from 13 mA to 102 mA,more than 85% of nitrate can be removed under applied current(78~102 mA),and without accumulation of nitrite.The consumption of anode will be accelerated at higher current.
分 类 号:X52[环境科学与工程—环境工程]
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