污水处理厂反硝化除磷研究及实践

Study and application of denitrifying phosphorus removal in wastewater treatment plant

结合苏州娄江污水处理厂生产运行实践,研究了改良型一体化交替反应池在实现良好反硝化除磷条件下的运行工况。实践表明,提高反硝化除磷的关键是要有充足的硝酸盐氮为反硝化聚磷菌（DPB）提供电子受体,当NO-3—N浓度在5 mg/L以上时,可以实现较好的反硝化除磷;当SRT为12~14 d时,反硝化除磷和系统脱氮除磷效果最好,生物除磷运行成本较低。此外,进水COD/TP、好氧池DO、厌氧池MLSS以及SRT也是影响一体化反应池生物除磷的主要因素。针对雨季低负荷运行除磷效果不理想的现象,提出了相应的工况运行措施。

Based on the practical operation of the Suzhou Loujiang Wastewater Treatment Plant,the operating condition of improved all-in-one alternate reaction tank in well denitrifying phosphorus removing condition was studied.The practice results showed： the key points to improve denitrifying phosphorus removal lied in offering enough chlorate as electron acceptor for denitrifying phosphorus bacteria（DPB）;when the NO-3—N concentration was above 5 mg/L,relatively good denitrifying phosphorus removal could be achieved.The best denitrifying phosphorus removal and system nitrogen and phosphorus removal could be achieved when SRT was 12~14 days,and the bio-phosphorus removal operation cost was low.The results also showed that influent COD/TP ratio,aerobic reaction tank DO,anaerobic tank MLSS and SRT were also main factors on all-in-one reaction tank bio-phosphorus removal effects.According to the unsatisfying low-loading phosphorus removal effects in rainy season,relating operation measures were also brought forward.