【摘要】 为合理确定曝气生物滤池的滤床厚度,以深圳市某污水处理厂二级出水为原水,研究了复合式曝气生物滤池中污染物浓度沿滤床深度方向的变化规律。结果表明,各功能分区的前端对污染物的去除能力最强;在水力负荷为6、10、14 m3/(m2.h)的条件下,当缺氧段的TN负荷为0.6~0.9 kg/(m3.d)且不采用回流时,150 cm厚的滤床对TN的去除率>50%,可去除95%左右的NO3--N;当好氧段的NH4+-N负荷为0.3~0.8 kg/(m3.d)时,150 cm厚的滤床可保证对NH4+-N的去除率>95%,处理出水水质达到回用水的标准。更多还原

【Abstract】 In order to reasonably determine the thickness of biological aerated filter bed,using the secondary effluent from a WWTP in Shenzhen City as raw wastewater,the variation of pollutants concentration along the depth of combined biological aerated filter was studied.The results show that the forepart of different stages has stronger pollutants removal capacity.At the hydraulic loading rates of 6 m3/(m2·h),10 m3/(m2·h) and 14 m3/(m2·h) and filter bed thickness of 150 cm,the removal rates of TN and NO3-N are more than 50% and about 95% in the anoxic stage when the TN load is 0.6 to 0.9 kg/(m3·d),and the removal rate of NH+4-N is more than 95% in the aerobic stage when the NH+4-N load is 0.3 to 0.8 kg/(m3·d).The effluent quality reaches the wastewater reuse standard.更多还原