NO3^-、NO2^-作为反硝化除磷最终电子受体的研究初探

PRELIMINARY STUDY OF NITRATE AND NITRITE AS FINAL ELECTRON ACCEPTOR OF DENITRIFICATION PHOSPHOROUS REMOVAL

为探讨反硝化除磷工艺较适合的电子受体,采用序批式反应器(SBR),在厌氧/缺氧条件下,分别利用NO3-、NO2-两种电子受体进行反硝化除磷的静态对比试验研究,考察两者之间的不同脱氮除磷特性。结果表明,在反硝化除磷过程中,硝酸盐必先转化为亚硝酸盐后才能继续反硝化为氮气;在低温状态下,亚硝酸盐反硝化除磷菌体的活性较硝酸盐反硝化除磷菌体更强;同等条件下,亚硝酸盐为电子受体时的平均厌氧释磷速率约是硝酸盐为电子受体时的两倍,缺氧吸磷速度则相当。亚硝酸盐在一定程度上可以充当生物除磷的最终电子受体。

In order to obtain the more suitable electron acceptor of denitrification phosphorus removal craft, in anaerobic/anoxic conditions, respective ly use NO3^- and NO2^-, two kinds of electron acceptors, to carry on the static contrast experimental study in sequencing batch Reactor activated sludge process （SBR）, and inspect the different characteristics of denitrification phosphorus removal. The results shown that： in the process of denitrification, nitrates must be transformed into nitrite first and then continue denitrifying to nitrogen.In low-temperature conditions, the activity of nitrate denitrification phos- phorus removal bacteria is better than that of nitrite denitrification phosphorus removal bacteria. In anaerobic conditions, the average rate of releasing phosphorus by using nitrite as electron acceptor is approximately twice of that by using nitrite as electron acceptor,but in anoxic conditions ,the rates of absorbing phosphorus are similar. To a certain extent, Nitrite could be used as the final electron acceptor in biological phosphorus removal.