交替好氧缺氧短程硝化及其特性

摘要

Two sequencing batch reactors ( SBR) treating domestic sewage with low COD/TN ratio were employed to investigate the realization and characterization of alternate oxic-anoxic nitritation . The results show that stable nitritation is realized on the condition of temperature of ( 24 ±2 )℃, sludge retention time of 35 day and without aeration restriction. And the nitrite accumulation rate of effluent is above 90%, with no ammonia and little nitrate ( lower than 2 mg/L ) in effluent. The specific ammonia oxidation rates of the SBRs being operated under alternate mode for 200 days are respectively twice and 1.8 times of those under oxic-anoxic mode, thus aeration duration is shortened and energy consumption of aeration is saved without impacting effluent quality. The performance of the SBRs operated under alternate mode is improved, and the ammonia, COD and TN removal efficiency reach 100%, 80% and 70% respectively.%为了完善交替好氧缺氧短程硝化研究,以低籽( COD)/籽( TN)实际生活污水为研究对象,采用2组SBR反应器,考察了交替好氧缺氧短程硝化的实现及其特性.结果表明：在温度(24依2)益、污泥龄为35 d且不限制溶解氧的条件下,以不同的好氧缺氧时间比运行的2组反应器均实现了稳定的短程硝化,出水的亚硝酸盐积累率达90%以上,氨氮质量浓度接近0 mg/L,硝酸盐质量浓度在2 mg/L以下；以交替好氧缺氧模式运行200 d后,2组反应器比氨氧化速率分别是普通好氧缺氧模式的2倍和1.8倍,在不影响出水水质的情况下,显著减少了曝气时间,降低了曝气能耗；交替模式运行的反应器污染物去除效果良好,氨氮去除率达100%,COD去除率在80%左右,TN去除率高于普通好氧缺氧模式的去除率,达70%.