常温SBR厌氧-好氧反应器的短程硝化

Partial Nitrification in Anaerobic-Aerobic SBR in Normal Water Temperature

短程硝化-反硝化是污水节能脱氮新技术之一,其关键在于实现短程硝化,而水温是控制短程硝化的主要因素。在生活污水氨氮浓度小于100mg/L的水质条件下,采用SBR厌氧-好氧反应器进行了常温短程硝化试验研究。研究结果表明,水温14．5℃～16．5℃的条件下,在好氧段可以实现短程硝化,亚硝化率达到了94．9%。亚硝化的程度还与曝气时间的长短有关,曝气时间短时,可以将氨氧化控制在亚硝化阶段,积累大量的亚硝酸盐,但是氨转化率比较低;曝气时间延长,氨氮去除率增加,同时部分亚硝酸氮会被进一步氧化成硝酸氮。该研究结果打破了只有在中高温条件下才能实现短程硝化的普遍看法,从而为在常温下实现短程硝化提供了新的依据。

Partial nitrification-denitrification,the key of which was the realization of partial nitrification,was considered to be one of the energy-economizing nitrogen removal processes.Water temperature was a main factor of controlling partial nitrification.An anaerobic-aerobic sequencing batch reactor with normal water temperature was adopted to treat domestic wastewater in which the concentration of ammonia nitrogen was below 100mg/L.The experimental results showed that the partial nitrification could be realized when the water temperature was between 14.5℃and 16.5℃,and the nitrosation rate was up to 94.9%.In addition,the degree of nitrosation was related to aeration time.When the aeration time was shorter,the ammonia oxidation could be controlled in the nitrosation stage,the ammonia conversion rate was however lower.While the aeration time was lengthened,the rate of ammonia nitrogen removal rose,and some nitrite nitrogen would be further oxidized into nitrate nitrogen.This experiment broke through the general view that partial nitrification was only realized in middle and high temperatures.So it provided a new evidence for realizing partial nitrification under ambient temperature.