改良型Carrousel氧化沟工艺生物脱氮除磷效果研究

Study on nitrogen and phosphorus removal effect by modified Carrousel oxidation ditch process

为了提高改良型Carrousel氧化沟工艺污水处理厂的脱氮除磷效果，结合某污水处理厂3年的运行实践，讨论了该工艺的处理效果，生物脱氮除磷原理及影响出水效果的因素。分析表明将DO控制在0．3—0．7mg／L范围内，能够使出水中的TN浓度低于20mg／L；在氧化沟中发生的同步硝化反硝化反应（SND）对总氮的去除的贡献占总系统脱氮的66％；该系统剩余污泥的含磷率为3．0％，生物细胞中平均含磷量可达细胞干重的4．2％；总磷去除率与污泥龄具有很好的线性关系，加大污泥排放量可以提高除磷效果。

In order to enhance the bio-nitrogen and phosphorus removal of the modified Carrousel oxidation ditch （OD） process, the treatment performance, the principle of bio-nitrogen and bio-phosphorus removal have been discussed, at the same time the influencing factors to the effluent quality have been analyzed from the operation practice for 3 years. Total nitrogen effluent was low than 20 mg/L if the dissolved oxygen could be controlled in the range of 0.3 - 0.7 mg/L in the oxidation ditch. Simultaneous nitrification and denitrification was found in the OD process. Generally the contribution to total nitrogen removal of SND was about 66%. The phosphorus content of the return activated sludge was 3.0% , and the average phosphorus content in the bio-cell was 4.2%. TP removal rate had a linear relation with SRT, the TP removal performance would be enhanced if the SRT can be decreased to some extent.