侧流除磷ERP-SBR新工艺中生物脱氮及影响因素研究

Influencing factors of biological nitrogen removal in the dypass phosphorus-removal ERP-SBR

侧流除磷ERP·SBR新工艺在进水COD=338-527mg／L、TN=40～60mg／L、TP=8～11mg／L的水质条件下，出水COD≤39mg／L、NH3-N≤1．8mg／L、TN≤〈5．8mg／L、TP≤0．29mg／L，且72％的总氮损失发生在好氧曝气阶段。在分析是影响该工艺生物脱氮因素时发现：SBR反应器的DO时间分布是影响好氧生物脱氮和缺氧内碳源反硝化的重要因素；侧流除磷工艺特有的高浓度活性污泥、颗粒大且密实的污泥絮体有利于形成好氧生物脱氮过程所需要的微环境；控制较长的污泥龄有利于提高系统的好氧脱氮能力，SRT与好氧脱氮率之间具有良好的线性关系：ηODN（％）=0．89×SRT-5．74。

In influent of the dypass phosphorus-removal ERP-SBR, when COD is 338 - 527 mg/L,TN is 40 -60 mg/L and TP is 8 -11 mg/L, perfect treatment will be reached： COD≤39 mg/L,NH3-N≤1. 8 mg/L, TN ≤5.8 mg! L,TP≤0.29 mg/L, and 72 percents of total nitrogen will be removed at aerobic phase. In this paper, the influencing factors of biological nitrogen removal are studied. The experiments show that dissolved oxygen is the important influencing factor of aerobic biological nitrogen removal and anoxic denitrification using endogenesis carbon . High concentration of actived sludge , big granule and thickness of sludge make for aerobic biologi- cal nitrogen removal. Long sludge retention time is in favor of improving aerobic nitrogen removal. The perfect linearity between sludge retention time and nitrogen removal rate is founded：ηODN（ % ） =0.89 × SRT- 5.74.