短程反硝化除磷系统的驯化及除磷特性研究

依据反硝化除磷(DBP)原理,采用批式试验,以城市污水为处理对象,研究了以NO_2~-为电子受体的反硝化除磷菌的筛选与富集,并对其反硝化除磷性能进行了考察.结果表明:NO_2~-对传统EBPR系统的抑制作用明显高于以NO_3~-为电子受体的反硝化除磷系统;对以NO_3~-为电子受体的反硝化除磷污泥用NO_2~-进行驯化,经过52个周期,缺氧吸磷量由0.3 mg/L升高到9.1mg/L,短程反硝化除磷系统驯化成熟;驯化成熟的短程反硝化除磷系统仍能以氧和NO_3~-作为电子受体进行吸磷并维持较高的吸磷速率,以亚硝酸盐为电子受体的除磷菌占总除磷菌的58.82%,说明短程反硝化除磷菌存在于传统除磷系统中,且能够很好地利用氧和硝酸盐为电子受体进行反硝化除磷.

Domestication of Denitrifying Phosphorus Removal System and Characteristics of Phosphorus Removal

Based on the denitrifying phosphorus removal principle, batch experiments were used to treat municipal wastewater. The screening and enrichment of denitrifying phosphorus removing bacteria using nitrite as electron acceptor and their characteristics were studied. The results show that the nitrite is more inhibitory to the EBPR system than denitrifying phosphorus removal system using nitrate as electron aeeeptor. The denitrifying phosphorus removal sludge using nitrate as electron acceptor is domesticated by nitrite. After 52 cycles, anoxie phosphorus uptake is increased from 0.3 mg/L to 9.1 mg/L. The short-cut denitrifying phosphorus removal system is domesticated maturely, and it can also use oxygen and nitrate as the electrun acceptors to take up phosphorus and keep a high phosphorus uptake rate. The phosphorus removing bacteria using nitrite as electron aeeeptor account for 58.82%, showing that the shortcut denitrifying phosphorus removing bacteria exist in the conventional phosphorus removal system and can well use oxygen and nitrate as the electron acceptors for denitrifying phosphorus removal.