短程反硝化聚磷的反硝化特征研究

Study on denitrification characteristics of short-cut denitrification phosphorus removal

研究了温度、pH值、电子供体种类及电子受体种类对反硝化的影响。试验结果表明,(1)在相同试验条件下,亚硝酸型反硝化与硝酸型反硝化的速率与硝态氮的浓度有关。在温度为25℃、pH为7的条件下,基质浓度<300 mg/L时短程反硝化速率较快;基质浓度≥300 mg/L时,以NO3-为基质的反硝化速率较大。(2)具有大量碳源储存物(PHB)的细菌可实现快速的内源性反硝化脱氮,而处于饥饿状态的细菌的内源性反硝化效率极低。

Effects of temperature, pH value, electron donor and electron acceptor on denitrification were studied. The experimental results showed that （ 1 ） at temperature of 25℃ , pH value of 7, and substrate concentration 〈 300 rag/L, more rapid denitrification rate could be achieved based on NO3^- of substrate; whereas at substrate concentration ≥300 rag/L, the dentrification rate was faster based on NO3^- , （2） rapid endogenous denitrification could be reached in anoxie phase by PHB oxidation ;the rate of endogenous denitrification was very low when bacteria in the state of famine.