地下水硝酸盐去除方法

METHODS FOR NITRATE REMOVAL FROM UNDERGROUND WATER

研究了以固相有机碳(棉花、纸、稻草和木屑)为碳源和反应介质的生物反应器对地下水中硝酸盐的去除。结果表明:以棉花和纸为碳源和反应介质的生物反硝化法能成功地去除地下水中硝酸盐。但以稻草和木屑为碳源和反应介质的生物反硝化法效果不好。四个反应器出水的pH值变化不大,纸张和棉花的出水pH值比进水pH值低0.5～0.6个单位,稻草次之,低0.2～0.3个单位,木屑只低0.1个各单位左右。出水中没有检测到铵态氮(NH4+-N)。出水细菌较多,一般在105个/mL水平.若作为饮用水,需要进一步处理。

The removal of nitrate from the underground water by biological reactor with solid organic carbon（cotton, paper, rice straw, wood flour） as carbon source and reaction media was studied. It was shown that the biological denitrification process with cotton and paper as carbon source and reaction media could remove nitrate from the underground water successfully, but that with rice straw and wood flour as carbon source and reaction media had poorer effect; pH values in the effluent of four reactors had smaller changes; the effluent pH value with paper and cotton was 0.5~0.6 lower than the influent pH value; that with rice straw came to the second, being 0.3 -0.2 lower than the influent pH; that with wood flour was about 0.1 only lower than the influent pH. NH4-N in the effluent was below the monitoring limit; there were more bacteria in the effluent, generally being about 10^5 bacteria each mL.