生物接触氧化流化床处理氨氮污水的实验研究

为了提高生物接触氧化流化床处理氨氮污水的脱氮效果,采用生物接触氧化流化床在自然温度下处理人工配制模拟生活污水实验的方法,研究了氨氮污水脱氮处理的可行性、方法与效果。实验结果表明:氨氮被氧化成硝酸可由两类独立的细菌分别催化完成;反应的适宜温度为20~35℃;亚硝酸菌的最适pH值为7~8.5之间,硝酸菌为6~7.5;亚硝酸菌和硝酸菌溶解氧质量浓度在0.5 mg/L以上才能取得较好的硝化效果。反应器内填料粒径在10 mm左右有利于提高氨氮的去除效率;间歇式进水方式使活性污泥具有良好的沉降性,可为氨氮的去除提供良好的环境条件。

Experimental study of treatment of ammonia Nitrogen sewage with biological contact oxidation fluidized bed

To enhance the efficiency of nitrogen removal of ammonia nitrogen sewage,the feasibility,methods and results of denitrification of the ammonia nitrogen sewage were studied by experiments using the biological contact oxidation fluidized bed to treat the synthetic municipal wastewater at normal temperature.The experimental results indicate that ammonia nitrogen can be converted to nitric acid by two independent kinds of bacteria respectively.The suitable temperature range is 20～35℃.The suitable pH value range for nitrosobacteria is 7-8.5,and that for nitrate bacteria is 6～7.5.Better effect can be achieved when the concentration of dissolved oxygen for nitrosobacteria and nitrate bacteria is higher than 0.5 mg/L.The best grain size of packing material is about 10 mm.Intermittent loading can improve the settling ability of activated sludge,which provides a good environmental condition for ammonia nitrogen removal.