【摘要】 试验采用SBR反应器处理低C/N生活污水,在温度为(25±0. 5)℃时,分别采用交替缺氧/好氧4次、交替好氧/缺氧5次和交替好氧/缺氧4次,时间比均为30 min∶30 min,NO2--N积累率在69、63和58周期分别达到96. 79%、98. 80%和98. 78%;同样温度下,控制好氧/缺氧时间比分别为30 min∶30 min、40 min∶20 min和30 min∶60 min,单周期交替次数为5、3和5时,NO2--N积累率于63、73及78周期时达到最大,其分别为98. 81%、97. 71%和94. 64%,对应AOB活性分别为96. 30、99. 27及102. 26,对其进行物料衡算,3种好氧/缺氧时间比下均存在同步硝化反硝化,同步硝化反硝化去除总氮分别为29. 89、28. 77及29. 78 mg·L-1.调整温度分别为18、25和30℃,在好氧/缺氧时间比为30 min∶30 min时,在第90、64和61周期时NO2--N积累率分别为99. 58%、99. 21%和95. 93%,污泥活性(f)达到最大所需时间分别为64、40及48周期,且污泥沉降性能均良好.更多还原

【Abstract】 Low C/N domestic sewage was treated in a SBR. With an operating temperature of( 25 ± 0. 5) ℃,NO2--N accumulation rates reached 96. 79%,98. 80%,and 98. 78% after 69,63,and 58 cycles,respectively. In each case,alternating modes of hypoxia/aerobic( four times),aerobic/anoxic( five times),and aerobic/anoxic( four times) were applied,respectively,with an alternating time of 30 min. At the same temperature,when the aerobic/anoxic time ratios were 30 min∶ 30 min,40 min∶ 20 min,and30 min∶ 60 min,and the single-cycle alternating times were 5,3,and 5,respectively,stable NO2--N accumulation rates reached98. 81%,97. 71%,and 94. 64% after 63,73,and 78 cycles,respectively. The activity of AOB was 96. 30,99. 27,and 102. 26,respectively. Simultaneous nitrification and denitrification occurred under the three aerobic/anoxic time ratios. The total amounts of nitrogen removed by synchronous nitrification and denitrification were 29. 89,28. 77,and 29. 78 mg·L-1. When temperatures were adjusted to 18,25,and 30℃,and when the aerobic/anoxic time ratio was 30 min ∶ 30 min,the NO2--N accumulation rates were99. 58%,99. 21%,and 95. 93% after 90,64,and 61 cycles,respectively. The activity of the sludge( f) peaked when after 64,40,and 48 cycles,while the sludge-settling performance was good.更多还原