李金成^1,,
陈泽新¹,
杨晓婷¹,
李俊成¹,
张晓¹,
夏文香¹
1.青岛理工大学环境与市政工程学院，青岛 266033
基金项目: 国家水体污染控制与治理科技重大专项子课题（2017ZX07101002）

Nitrate removal from groundwater by three-dimensional biofilm electrode reactor

LI Jincheng^1,,
CHEN Zexin¹,
YANG Xiaoting¹,
LI Juncheng¹,
ZHANG Xiao¹,
XIA Wenxiang¹
1.College of Environmental & Civil Engineering，Qingdao University of Technology，Qingdao 266033，China

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摘要:采用三维生物膜电极反应器（three-dimensional biofilm electrode reactor，3D-BER）并接种氢自养反硝化菌，研究了不同因素对其处理地下水中硝酸氮的影响。结果表明：反应器的电极间距减小有利于硝酸氮的去除，但会增加亚硝酸氮积累的风险，适宜的极板间距为50 mm；去除硝酸氮的最佳电流强度范围为40～60 mA，最适进水硝酸氮浓度范围为35～50 mg·L-1，最佳进水pH的范围为7.5～8.5，最佳水力停留时间为12 h。该条件下反应器运行效果稳定，不需外加氢源和碳源。通过与不接种氢自养反硝化菌的反应器进行对比分析，认为随着电流强度的增加，纯电化学作用对硝酸氮的还原作用也增强，但纯电化学反应在反应器脱氮过程中的比例远小于生物作用。3D-BER对硝酸氮的去除是由氢自养反硝化作用、电化学反应与部分异养反硝化共同作用的结果。
关键词: 三维生物膜电极反应器/
硝酸盐/
亚硝酸盐/
地下水/
电化学

Abstract:Main factors influencing the removal effect of nitrate nitrogen from groundwater were studied using three dimensional biofilm electrode reactor(3D-BER）inoculated with autohydrogenotrophic denitrification bacteria. The results showed that the reduction of space between electrodes is benifit to the removal of nitrate nitrogen whereas the nitrite nitrogen accumulation will increase, and the appropriate space is 50 mm. The optimum condition removing nitrate from the reactor are from 40 to 60 mA of current intensity, 35 to 50 mg·L-1 NO3 - N in influent, pH 7.5 to 8.5 and HRT no less than 12 h, under which no more hydrogen and carbon are needed with the reactor running stably. In order to understand the mechanism of 3D-BER, two reactors with or without autohydrogenotrophic denitrification bacteria were compared. The results showed that that electrochemical reduction action of NO3-N increase with the augment of current intensity, but the pure electrochemical reaction accounts for less percentage in the removal of nitrate in 3D-BER compared to biological denitrification action. The removal of NO3-N in 3D-BER is combined effects by electrochemical reaction, autohydrogenotrophic bacteria denitrification and partial heterotrophic denitrification.
Key words:three-dimensional biofilm electrode reactor/
nitrate/
nitrite/
groundwater/
electrochemical.

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三维生物膜电极反应器去除地下水中硝酸氮

李金成^1,,
陈泽新¹,
杨晓婷¹,
李俊成¹,
张晓¹,
夏文香¹
1.青岛理工大学环境与市政工程学院，青岛 266033
基金项目: 国家水体污染控制与治理科技重大专项子课题（2017ZX07101002）
关键词: 三维生物膜电极反应器/
硝酸盐/
亚硝酸盐/
地下水/
电化学
摘要:采用三维生物膜电极反应器（three-dimensional biofilm electrode reactor，3D-BER）并接种氢自养反硝化菌，研究了不同因素对其处理地下水中硝酸氮的影响。结果表明：反应器的电极间距减小有利于硝酸氮的去除，但会增加亚硝酸氮积累的风险，适宜的极板间距为50 mm；去除硝酸氮的最佳电流强度范围为40～60 mA，最适进水硝酸氮浓度范围为35～50 mg·L-1，最佳进水pH的范围为7.5～8.5，最佳水力停留时间为12 h。该条件下反应器运行效果稳定，不需外加氢源和碳源。通过与不接种氢自养反硝化菌的反应器进行对比分析，认为随着电流强度的增加，纯电化学作用对硝酸氮的还原作用也增强，但纯电化学反应在反应器脱氮过程中的比例远小于生物作用。3D-BER对硝酸氮的去除是由氢自养反硝化作用、电化学反应与部分异养反硝化共同作用的结果。

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