一种新型异养自养集成工艺处理地下水硝酸盐试验

A novel approach combining heterotrophic with autotrophic denitrification for nitrate removal from groundwater

研究了一种利用电化学产氢自养反硝化（electrochemical hydrogen autotrophic denitrification）与固相异养反硝化（solid-phase heterotrophic denitrification）集成技术去除地下水中硝酸盐的方法.这种方法能够高效去除水中的硝酸盐且操作简单.试验结果表明,当进水NO3--N浓度为70mg·mL^-1,电流强度控制在40mA,HRT为3.9h时,出水中NO3^--N浓度为1.2mg·mL^-1,硝态氮去除率达到98.3%,TN去除率达到95.6%,反应器中没有NO2^--N积累,且pH值稳定在7.0-8.1之间.

A combined process with solid-phase denitrification and electrochemical hydrogen autotrophic denitrification was studied.This process could be easily operated and had high nitrate removal efficiency.The results showed that,when the current was 40 mA and the HRT was 3.9 h,the NO3^--N concentration in the effluent was decreased from 70 mg·L^-1 to 1.2 mg·L^-1.The NO3^--N removal efficiency was up to 98.3%,and the TN removal efficiency was 95.6%.No accumulation of NO2^--N in the reactor was found,and the pH of the effluent was stable between 7.0 and 8.1.