沸石曝气生物滤池中亚硝酸盐氮积累的研究

Study on Nitrite Nitrogen Accumulation in Zeolite Biological Areated Filter

利用沸石曝气生物滤池研究了硝化反应中亚硝酸盐氮的积累现象.试验结果表明：同时增大滤速和进水氨氮浓度可以提高滤池出水中亚硝酸盐氮的浓度.在滤速为1 m/h、气水比为1：1、水温为13～16℃、进水氨氮负荷为1.5～1.8 kg/（m^3·d）的条件下,系统对氨氮的去除能力为0.7～0.9 kg/（m^3·d）,亚硝酸盐氮占硝化反应产物的90%以上.沸石的离子交换能力对滤池中氨氮浓度具有调节作用,有利于实现亚硝酸盐氮的稳定积累.

The nitrite nitrogen accumulation during nitrification in Zeolite Biological Areated Filter （ZBAF） was investigated. The results show that the nitrite nitrogen concentration in the effluent is enchanced by the increase of filtration rate and ammonia nitrogen concentration simultaneously. Under the conditions of the filtration rate of 1 m/h, air/water ratio of 1 ： 1, water temperature of 13 - 16℃, influ- ent ammonia nitrogen loading of 1.5 - 1.8 kg/（ m^3 · d）, the ammonia nitrogen removal capacity is 0.7 -0.9 kg/（m^3 · d）, and the nitrite nitrogen amounts to over 90% of the sum of the nitrification production. The ammonia nitrogen concentration in the filter is adjusted by ion exchange of zeolite. Therefore, stable nitrite nitrogen accumulation is achieved.