低氧MBR中有机物对脱氮过程的影响

Effects of organics on the process of biological nitrogen removal in MBR under low DO condition

研究了低氧膜生物反应器(MBR)中有机物对脱氮过程的影响.在进水COD为360,220,140mg/L情况下,生物反应器系统的总氮去除率分别为89%,72%,22%,可以看出有机物质量浓度的降低不利于同步反硝化脱氮;对异养菌的活性产生危害,但却利于硝化菌.这削弱了有机物对硝化作用的抑制影响,使系统中活性污泥具有硝化过程和氨氮同化过程同步进行的特性,在理论上有利于提高低氧脱氮的效率和降低系统的污泥产率.

In this paper, the effect of organic matter on the biological nitrogen removal in MBR under low DO condition was studied. Results showed that at different concentrations of influent COD of 360, 220 and 140mg/L, the corresponding removals of TN were 89%, 72% and 22% respectively, indicating that the reduction of influent COD was detrimental to the simultaneous denitrification. On another hand, the ＂reduction＂ alleviated the restraining effect of organics on nitrification, which was benefited from the increase of nitrification activity and the decrease of organic degradation in the system. This consequently made it possible that ammonia could be utilized for assimilation and nitrification concurrently, favoring nitrogen removal under low DO condition and the reduction of sludge production.