Li Xiu-Li, Yang Jun-Jun, Lu Xiao-Xia, Zhang Shu, Hou Zhen
Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Huan Jing Ke Xue. 2013 Mar;34(3):914-8.
To provide a cost-effective method for the remediation of nitrate-polluted groundwater, column experiments were performed to study the removal of nitrate by permeable reactive barrier filled with fermented mulch and sand (biowall), and the mechanisms and influence factors were explored. The experimental results showed that the environmental condition in the simulated biowall became highly reduced after three days of operation (oxidation-reduction potential was below - 100 mV), which was favorable for the reduction of nitrate. During the 15 days of operation, the removal rate of nitrate nitrogen (NO3(-) -N) by the simulated biowall was 80%-90% (NO3(-)-N was reduced from 20 mg x L(-1) in the inlet water to 1.6 mg x L(-1) in the outlet water); the concentration of nitrite nitrogen (NO2(-) -N) in the outlet water was below 2.5 mg x L(-1); the concentration of ammonium nitrogen (NH4(+) -N) was low in the first two days but increased to about 12 mg x L(-1) since day three. The major mechanisms involved in the removal of nitrate nitrogen were adsorption and biodegradation. When increasing the water flow velocity in the simulated biowall, the removal rate of NO3(-) -N was reduced and the concentration of NH4(+) -N in the outlet water was significantly reduced. A simulated zeolite wall was set up following the simulated biowall and 98% of the NH4(+) -N could be removed from the water.
为提供一种经济高效的修复硝酸盐污染地下水的方法，进行了柱实验，以研究填充发酵覆盖物和沙子的渗透反应屏障（生物墙）对硝酸盐的去除效果，并探讨其机制和影响因素。实验结果表明，模拟生物墙运行三天后，其内部环境条件变为强还原状态（氧化还原电位低于-100 mV），这有利于硝酸盐的还原。在运行的15天内，模拟生物墙对硝酸盐氮（NO3(-)-N）的去除率为80%-90%（NO3(-)-N从进水的20 mg·L(-1)降至出水的1.6 mg·L(-1)）；出水中亚硝酸盐氮（NO2(-)-N）的浓度低于2.5 mg·L(-1)；铵态氮（NH4(+)-N）的浓度在前两天较低，但从第三天起增加到约1
