摘要
针对地下水中的硝酸盐,采用三维电极生物膜与硫自养耦合工艺对其进行去除,并研究了电流强度对该工艺脱氮特性的影响。结果表明,电流强度对耦合反应器的脱氮效果影响较大,NO3^--N去除率随电流强度的增大而增大;在温度为20~25℃、进水NO3^--N浓度为70 mg/L左右、进水NaHCO3浓度为1 g/L、进水pH值为7.0~7.5、HRT为16 h、电流强度为400 mA的条件下,反应器对硝酸盐氮的平均去除率为97.15%;反应器内有二次污染物NO2^--N和SO4^2-的生成积累,且NO2^--N的积累浓度随电流强度的增大急剧下降,而SO4^2-的积累浓度随电流强度的增大逐渐上升;氢自养反硝化所占比例随电流强度的增大而减小,而硫自养反硝化所占比例随电流强度的增大而增大;反应器去除单位NO3^--N的电耗随电流强度的增大而增大。
The three-dimensional electrode biofilm coupled with sulfur autotrophic denitrification process was used to remove nitrate in groundwater,and the effect of current intensity on the denitrification characteristics of the coupled process was explored.Current intensity had a great influence on the denitrification effect of the coupled process,and the removal rate of NO3^--N increased with the increase of current intensity.The average removal rate of nitrate was 97.15% when the temperature was 20-25℃,influent nitrate concentration was about 70 mg/L,influent NaHCO3 concentration was 1 g/L,influent pH was 7.0-7.5,HRT was 16 h and current intensity was 400 mA.There were formation and accumulation of secondary pollutants NO2^--N and SO4^2- in the reactor,and the accumulation concentration of NO2^--N decreased sharply with the increase of current intensity,while the accumulation concentration of SO4^2- increased gradually with the increase of current intensity.With the increase of current intensity,the proportion of hydrogen autotrophic denitrification decreased,while the proportion of sulfur autotrophic denitrification increased.The power consumption of the reactor to remove unit NO3^--N increased with the increase of current intensity.
作者
王旭峰
丛培龙
何培弘
李尔
杨涛
杨开
WANG Xu-feng;CONG Pei-long;HE Pei-hong;LI Er;YANG Tao;YANG Kai(Wuhan Municipal Engineering Design and Research Institute Co.Ltd.,Wuhan 430023,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2019年第23期22-27,共6页
China Water & Wastewater
关键词
地下水
硝酸盐
三维电极生物膜
硫自养反硝化
电流强度
groundwater
nitrate
three-dimensional electrode biofilm
sulfur autotrophic denitrification
current intensity
