生物慢滤技术脱氮性能试验研究

Research on Denitrification of Bio-slow Sand Filtration

对生物慢滤技术脱氮性能和硝化反硝化过程进行了研究。当慢滤反应器表面形成稳定的生物黏膜后,分别进行氨氮、硝酸盐氮、亚硝酸盐氮、总氮去除效果试验研究。通过投加重金属盐,进行脱氮效果影响研究。结果表明:①氨氮去除率与进水氨氮浓度关系不大,氨氮去除率稳定在90%以上。②生物慢滤反应器中硝化过程主要在滤料上部0.5m高度内完成,反硝化过程位于反应器下部。③生物慢滤反应器为维持较高的氨氮去除效果,滤速应小于0.6m/h;④当进水中铅、镉离子浓度超过国家地表水环境质量标准(GB3838-2002)Ⅴ类水标准时,氨氮去除率下降50%。

This paper aims at introducing a bio-slow sand filtration method for denitrifieation performance,nitrification and denitrifica- tion process. It begins with the study of the removal efficiency of ammonia-nitrogen, nitrate nitrogen, nitrite nitrogen, ①The removal We study the removal efficiency of nitrogen by cast metal salts into raw water. The experimental results show that： ②The removal efficiency of ammonia will be not affected by the influent ammonia concentration, and the removal rate of ammonia stabilized at 90%. OThe nitrification process is completed within the filter upper 0. 5m height, the denitrification process is completed in the lower part of the bio-slow sand filtration. ③In order to maintain high ammonia removal efficiency, the filtration rate should be less than 0. 6m/ h. ④The removal efficiency of ammonia decreased by 50 % when the influent concentration of lead, cadmium ions exceeds the national surface water environmental quality standards （GB3838-2002）.