连续流催化臭氧氧化污水处理厂尾水效能研究

摘要

To further reduce the residual organic matter in effluent of wastewater treatment plants (WWTPs),the performance of continuous flow catalytic ozonation,with Cu/Y-TS-1 as the catalyst,in advanced effluent polishing was studied.The effects of ozone dosage and contact time on contaminants removal were also investigated.The results showed that the Cu/Y-TS-1 catalyzed ozonation not only could effectively remove the organic matter in the WWTPs' effluent,but also could further reduce the nitrogen content in water under continuous flow operation.The concentrations of COD,dissolved organic carbon (DOC) and NH3-N were reduced from 53.1 mg/L,16.7 mg/L and 7.34 mg/L to 19.5 mg/L,8.8 mg/L and 2.4 mg/L,respectively,under the conditions of contact time at 30 min,ozone flux at 106.3 mg/min,ozone flow rate at 1 L/min,and Cu/Y-TS-1 catalyst dosage at 30 g/L.Compared to the process of ozonation alone,the removal efficiencies of COD,DOC and NH3-N were raised by 16.1 ％,21.3 ％ and 51.1％,respectively.The removal efficiencies of organic matter and ammonia were benefited from the increase of ozone dosage and reaction time.%为实现城市污水处理厂尾水中残留有机物的进一步削减,降低其在环境中的危害,以钛硅分子筛TS-1负载铜和钇(Cu/Y-TS-1)为催化剂,研究连续流催化臭氧氧化深度处理城市污水处理厂尾水的效能,并考察了臭氧投加量及停留时间对尾水处理效果的影响.结果表明:连续流运行条件下,Cu/Y-TS-1催化臭氧氧化不仅能够有效去除尾水中的有机物,还可以进一步控制水中氮素的污染.在停留时间30 min、臭氧通量106.3 mg/min、臭氧流速1 L/min、Cu/Y-TS-1催化剂30 g/L条件下,COD、溶解性有机碳(DOC)及NH3-N分别由进水浓度53.1 mg/L、16.7 mg/L和7.34 mg/L降低到19.5 mg/L、8.8 mg/L和2.4 mg/L.与单独臭氧氧化相比,COD、DOC和NH3-N分别提高了16.1％、21.3％和51.1％.臭氧投加量的增加及停留时间的延长有利于有机物和NH3-N的去除.