反硝化除磷污泥的缺氧吸磷性能研究

Anoxic Phosphorus Uptake Characteristics of Sludge in Denitrifying Phosphorus Removal

为探讨反硝化除磷过程中污泥的缺氧吸磷性能,利用厌氧/缺氧强化驯化得到的反硝化除磷污泥,通过间歇性试验考察不同电子受体类型、不同污泥浓度(MLSS)对吸磷过程的影响。试验结果表明,缺氧条件下反硝化除磷菌(DPB)利用硝酸盐作为电子受体能够彻底吸磷,其吸磷速率约为好氧吸磷的59%;若以亚硝酸盐为电子受体,浓度较低时(10.6 mg/L)的吸磷速率与硝酸盐为电子受体时相当,但较高的亚硝酸盐浓度(22.6 mg/L)会抑制反硝化除磷过程;适当提高污泥浓度能加快缺氧吸磷速度,而过高的污泥浓度会降低污泥对氮、磷的比去除速率,故应将MLSS控制在合理的范围内。

Activated sludge of a bench-scale SBR,which was dominated by denitrifying phosphorus removing bacteria（DPB）,was studied about its performance of anoxic phosphorus uptake.The findings of the experimental study showed that under the anoxic condition,nitrate could be used as electron acceptors to uptake P completely when utilized by DPB,with the rate much faster than that of aerobic P uptake;while nitrite was used as electronic acceptors with the rate as fast as that of nitrate on condition that nitrite concentration was as low as 10.6 mg/L,otherwise,inhibition of denitrifying P removal would be caused by higher concentration of nitrite（22.6 mg/L）.Appropriate increases of MLSS could speed up anoxic P uptake rate while over-high MLSS would reduce specific rate of nitrogen and P,so MLSS should be controlled within a reasonable range.