反应器分区提高生物接触氧化硝化性能的研究

Studies on the reactor-comparting enhancing the nitrification property of biologic contact oxidation.

为克服普通生物接触氧化反应器中因硝化菌与有机物降解菌的竞争劣势而影响硝化活性的问题，将反应器简单分隔，通过微生物生态调控，以提高硝化性能．结果表明，在BOD、TN负荷分别为1．0、0．19kg／（m^3·d）的中等负荷条件下，反应器分区后硝化率提高33％．反应器两区分别形成以降解有机物和硝化为主的功能区．分区式接触氧化反应器后区段的硝化速率是单区式反应器的2．8-4．5倍，亚硝酸菌密度提高1个数量级．分区式反应器在0．26kg/（m^3·d）的高TN负荷条件下运行时，由于硝化细菌活性降低导致硝化率降低，而在0．08kg/（m^3·d）的低负荷条件下运行时，后区段过低的氨氮浓度限制了硝化能力的发挥，因此分区式反应器宜在中等负荷下运行．

In order to overcome the problem of competing inferiority of nitrification bacterium to organism degradation bacterium influencing the nitrification activity in common contact oxidation, the reactor was isolated simply and the characteristics of enhancing the nitrification property through microbial ecological control was studied. Under the condition of medium loading of BOD 1.0kg/（m^3·d） and TN 0.19kg/（m^3·d） respectively, the nitrification rate after reactor-comparting was enhanced 33%. These two reactors comparted formed the function areas of organism degradation main and nitrification main respectively. The nitrifying rate of partitional contact oxidation reactor was 2.8-4.5 times of the single partifional reactor. The density of nitritebacteria enhanced an order of magnitude. When the partitional reactor operating at high TN loading of 0.26kg/（m^3·d）, its nitrification rate declined due to decrease of nitrifying bacterium activity; while operating at low loading of 0.08kg/（m^3·d）, the too low NH4^＋-N concentration of rear-area limited the exertion of nitrification ability; therefore, the comparting reactor should be operated under medium loading.