混凝-臭氧氧化对渗滤液生化出水有机微污染物的去除效果

Efficiency of coagulation-ozone oxidation on the removal of organic micropollutants from biotreated leachate

为了探究混凝-臭氧氧化技术对渗滤液生化出水中有机微污染物的去除效能,以青岛某渗滤液生化出水为实验对象,分析了混凝剂种类、投加量及pH等因素对有机物的去除效果,研究了O_(3)、GAC/O_(3)、UV/O_(3)臭氧氧化体系对混凝出水去除效果的提升作用,进一步系统评估了混凝-臭氧氧化技术对渗滤液生化出水中抗生素类有机微污染物的去除效能。结果表明,当聚合硫酸铁(PFS)投加量为4g/L、pH=7、臭氧流量为80mg/min、反应30min时,PFS-UV/O_(3)对COD和色度(CN)的去除率分别为86.27%和99.06%,显著优于PFS-O_(3)和PFS-GAC/O_(3);在最优条件下,混凝-臭氧氧化抗生素具有良好的去除效果,PFS-UV/O_(3)对氧氟沙星、恩诺沙星、磺胺胍、金霉素的去除率分别为100%、95.06%、100%和100%;三维荧光-平行因子分析可知,经PFS-UV/O_(3)处理后渗滤液生化出水中腐殖类荧光物质特征峰消失,得以有效分解;技术经济分析可知,PFS-UV/O_(3)处理技术的能源消耗和成本分别为75.34kW·h/kg COD和53.00CNY/kg COD。整体而言,PFS-UV/O_(3)处理技术经济可行,具有潜在的应用前景。

In order to explore the removal efficiency of coagulation-ozone oxidation technology on organic micro pollution in biotreated leachate,the biotreated leachate in Qingdao was taken as the experimental object,and the impact factors such as coagulant type,dosage and pH on organic matter on pollutant removal were analyzed.The enhancement effect of O_(3),GAC/O_(3)and UV/O_(3)ozone oxidation systems on the removal effect of coagulant effluent were investigated.Further,the efficiency of coagulation-ozonation technology on the removal of antibiotic organic micropollutants from biotreated leachate was systematically evaluated.The results showed that with the dosage of polyferric sulfate(PFS)of 4g/L,pH=7,ozone flow rate of 80mg/min,and the reaction time of 30min,the removal efficiencies of COD and chroma(CN)of PFS-UV/O_(3)are 86.27%and 99.06%,respectively,which are significantly better than PFS-O_(3)and PFS-GAC/O_(3).Under optimal conditions,coagulation-ozonation on antibiotics removal had good performance,removal rates of ofloxacin,enrofloxacin,sulfaguanidine and chlortetracycline during PFS-UV/O_(3)process were 100%,95.06%,100%and 100%,respectively.Three-dimensional fluorescence parallel factor analysis showed that the characteristic peaks of humus fluorescent substances in biotreated leachate disappeared and decomposed effectively after PFS-UV/O_(3)treatment.According to the technical and economic analysis,the energy consumption and cost of PFS-UV/O_(3)treatment technology were 75.34kW·h/kg COD and 53.00CNY/kg COD,respectively.On the whole,PFS-UV/O_(3)treatment technology was economically feasible and had potential application prospects.