改良型Carrousel氧化沟工艺生物脱氮除磷效果研究

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0.3～0.7 mg/L范围内,能够使出水中的TN浓度低于20 mg/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.

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

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.