填料型A2/O工艺污水处理及反硝化除磷效能

填料型A~2/O工艺是在A~2/O工艺的基础上通过向厌氧池、缺氧池、好氧池中投加醛化纤维式组合填料,将传统活性污泥法与生物膜法相结合组成一套脱氮除磷的新系统,文章对填料型A~2/O工艺与传统A~2/O工艺处理生活污水的效果进行了对比研究,以及对该复合式工艺在不同硝化液回流比下反硝化除磷能力进行了分析.研究结果表明,相同条件下,填料型A~2/O工艺对生活污水的处理效果要优于传统A~2/O工艺,分别使COD和氨氮的去除率达到92.5%和93.1%.试验通过增加硝化液回流比的措施使得反硝化聚磷菌在填料上富集程度增大,当硝化液回流比为300%时,缺氧池的NO-3-N浓度为3.03 mg·L~(-1),吸磷量最大为26.28 mg·L~(-1),胞内聚合物PHB代谢活性最好,利用率最高为1.32 g·g~(-1)·L~(-1).体现了填料型A~2/O工艺具有显著的反硝化除磷效果.

Fiber carrier A2/O process treating domestic wastewater and denitrifying phosphorus removal efficiency

Fiber carrier A²/O process is developed by adding polyvinyl alcohol fiber to the anaerobic, anoxic and aerobic tank in a A²/O process by combining biofilm approach into conventional activated sludge process to constitute a new system. Fiber carrier A²/O process was compared with traditional A²/O process for domestic wastewater treatment, and the effect of different nitrification liquid reflux ratio on denitrifying phosphorus removal was studied. Results show that the fiber carrier A²/O process has obvious advantages. The COD and ammonia removal rate reached 92.5% and 93.1%, respectively. Though increasing the nitrification liquid reflux ratio can make the DNPAOs enrich on the carrier. When reflux ratio was increased to 300%, the amount of phosphorus absorption was 26. 28 mg·L^-1 and the maximum utilization of PHB was 1.32 g·g^-1·L^-1 and had the best metabolic activity. The system of fiber carrier A²/O was proved to have significant denitrifying phosphorus removal capacity.