利用固定化藻菌耦合系统同步去除污水中的COD和氮磷

利用活性污泥和莱茵衣藻建立了一套固定化藻菌耦合系统同步去除污水中的COD和氮磷.系统污水日处理量为6 m3,水力停留时间为12 h.对于活性污泥部分,当厌氧槽搅拌转速为15 r.min-1,好氧槽DO值为5 mg.L-1时COD由150 mg.L-1左右降到50 mg.L-1,氨氮从20～30 mg.L-1降到0.5 ...

Simultaneously Removal of COD, Nitrogen and Phosphorus from Wastewater by Coupling Treatment System with Immobilized Algae-Bacteria

A coupling treatment system was developed by employing immobilized Chlamydomonas reinhardti and activated sludge to simultaneously remove COD, nitrogen and phosphorus from wastewater. The amount of wastewater treated by the system was 6 m³ per day, and hydraulic retention time was 12 h. For activated sludge section, as stirring rate of anaerobic tank was 15 r·min^-1 and DO value of aerobic tank was 5 mg·L^-1, COD decreased from about 150 mg·L^-1to 50 mg·L^-1 and NH⁺₄-N from 20-30 mg·L^-1to 0.5 mg·L^-1, whereas TP only dropped from 2-3 mg·L^-1 to 1.0 mg·L^-1. For immobilized C. reinhardti section, the suitable conditions were: DO 5 mg·L^-1, illumination intensity 2000 lx, the loading ratio of immobilization pellets 20%, respectively. Under the appropriate conditions of the coupling treatment system, COD, NH⁺₄-N and TP of the effluent were about 15 mg·L^-1, 0.5 mg·L^-1 and 0.5 mg·L^-1, respectively. During 2 months period of continuous treatment, COD, NH⁺₄-N and TP of the effluent kept fairly constant, showing the stability of the coupling wastewater treatment system.