以乙酸钠为单一碳源,在C/N比为3、温度为12-14℃的低C/N比、低温条件下通过间歇试验研究pH对反硝化亚硝酸盐积累规律影响.试验结果发现,在C/N为3时,pH值在7-9的范围内都能形成亚硝酸盐积累.反应时间为60 min时,亚硝酸盐积累率最大可达50％左右,低温SBR反应器连续试验研究表明,pH值为7.4±0.1和pH值为8.4+0.1时,序批式活性污泥法(SBR)出水亚硝酸盐积累率分别为51％和48％,取pH值为7.4±0.1条件下SBR反应器活性污泥进行酶活力测定发现,硝酸盐还原酶活力是亚硝酸盐还原酶活力的1.2倍,硝酸盐还原酶活力与亚硝酸盐还原酶活力对外界条件变化敏感程度不同,亚硝酸盐还原酶对外界条件变化更为敏感,其受到的抑制作用要大于硝酸盐还原酶,进而造成NO2-N的积累.
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