Efficiency of coagulation-ozone oxidation on the removal of organic micropollutants from biotreated leachate
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 O3,GAC/O3 and UV/O3 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/O3 are 86.27％and 99.06％,respectively,which are significantly better than PFS-O3 and PFS-GAC/O3.Under optimal conditions,coagulation-ozonation on antibiotics removal had good performance,removal rates of ofloxacin,enrofloxacin,sulfaguanidine and chlortetracycline during PFS-UV/O3 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/O3 treatment.According to the technical and economic analysis,the energy consumption and cost of PFS-UV/O3 treatment technology were 75.34kW·h/kg COD and 53.00CNY/kg COD,respectively.On the whole,PFS-UV/O3 treatment technology was economically feasible and had potential application prospects.
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