碳磷比对生物除磷效率及污泥特征的影响探究

Effects of Carbon Phosphorus Ratio on Biological Phosphorus Removal Efficiency and Sludge Characteristics

针对进水碳磷比(C/P)冲击负荷对活性污泥生物除磷及污泥特征影响不明确的现状,在中温条件下开展了进水C/P(300/8~300/12)对活性污泥强化生物除磷及污泥特征的影响探究。结果表明:C/P降低利于生物除磷效率的提高,且当进水C/P由300/5降低至300/12时,生物除磷效率由84.5%~86.2%提高至94.6%~96.8%,化学需氧量(COD)去除率由86.5%~89.2%提高至94.2%~96.8%,生物除磷系统内氨氮去除均维持在90%以上,C/P变化对氨氮去除影响不明显。C/P降低提高了厌氧期TP释放和好氧期TP的超量吸收,且在阶段IV,厌氧净释磷量和好氧净吸磷量分别高达14.8 mg/L和26.37 mg/L,均高于其他阶段。COD的消耗主要集中于厌氧期。在C/P为300/12时,存在一定程度反硝化除磷。C/P降低提高了胞外聚合物(EPS)的含量,在阶段IV,EPS含量升高至78.8~81.2 mg/g。C/P降低对EPS内蛋白质含量具有一定促进作用。C/P降低促进了污泥沉降,在阶段III和阶段IV内,污泥体积指数下降至94~102 mL/g,沉降性能良好。研究结果对理解不同进水C/P负荷的生物除磷系统的响应提供了一定的数据支撑与理论依据。

Because of the unclear influence of influent C/P impact load on biological phosphorus removal and sludge characteristics of activated sludge,the influence of influent C/P(300/8~300/12)on biological phosphorus removal and sludge characteristics of activated sludge was studied under medium temperature conditions.The results showed that the decrease of C/P was beneficial to improve the efficiency of biological phosphorus removal,and when the influent C/P was reduced from 300/5 to 300/12,the biological phosphorus removal efficiency increased from 84.5%~86.2%to 94.6%~96.8%,and the COD removal efficiency increased from 86.5%~89.2%to 94.2%~96.8%.The ammonia nitrogen removal in the biological phosphorus removal system remained above 90%,and the influent C/P had no obvious effect on the ammonia nitrogen removal.The reduction of C/P increased the phosphorus release of TP in the typical cycle and the excessive absorption of TP was found in the aerobic stage.In stage IV,the anaerobic phosphorus release and aerobic phosphorus absorption were as high as 14.8 mg/L and 26.37 mg/L respectively,which were higher than that of other stages.The consumption of COD was mainly concentrated in the anaerobic period.When the C/P was 300/12,there was denitrifying phosphorus removal to a certain extent.The decrease of C/P increased the content of the extracellular polymer.In stage IV,the content of EPS increased to 78.8~81.2 mg/g.The decrease of C/P improved the protein content in EPS.The reduction of C/P improved the sludge sedimentation.In the III and IV stages,the sludge volume index decreased to 94~102 mL/g,and the sedimentation performance was good.