当前国内很多地方都将曝气生物滤池用于污水深度处理和回用。从保障再生水安全的角度出发,采用小试装置,对曝气生物滤池去除典型环境激素——邻苯二甲酸二(2-乙基己基)酯的效能进行了研究。结果发现,采用厚度1 000 mm的石英砂做滤料,在滤速0.5 m/h的条件下,进水邻苯二甲酸二(2-乙基己基)酯在5-35μg/L范围内时,即使浓度波动很大,曝气生物滤池出水邻苯二甲酸二(2-乙基己基)酯可稳定在5μg/L左右,表现出良好的适应能力。滤速升高时,曝气生物滤池去除的邻苯二甲酸二(2-乙基己基)酯能力稍有下降。实验证明了曝气生物滤池在去除邻苯二甲酸二(2-乙基己基)酯方面的良好性能。
Biological aerated filter is widely used in China as an advanced wastewater treatment technology.To evaluate the safety of its effluent,a pilot scale biological aerated filter with 1 000 mm hight quartz sands as filter bed was built in our lab to polish the secondary effluent of a sequencing batch reactor which was fed with domestic wastewater.The concentrations of di(2-ethylhexyl) phthalate(DEHP)in the influent and effluent of the biological aerated filter were carefully determined under different operational conditions.All results showed that,at the filtration rate of 0.5 m/h and the influent concentration of DEHP varied between 5~35 μg/L drasticly,the effluent concentration of DEHP was stable at 5 μg/L.With proper design and operation,biological aerated filter is a feasible technology for DEHP removal.