Application Study of Biochemical+Fenton Oxidation+Qzone Catalytic Oxidation+Biological Activated Carbon Combined Process in the Treatment of Medical and Chemical Wastewater
The wastewater from various medical chemical enterprises in a medical and chemical park is treated by the internal sewage treatment station in the enterprise to reach the management standard(the concentration of COD is not more than 500 mg/L),and then discharged into the downstream sewage treatment plant.At present,the concentration of CODCr in the drainage of each enterprise is between 200 and 450 mg/L,and the BOD5/CODCr of the wastewater is only about 0.1,which is poor in biodegradability and easy to affect the downstream sewage treatment plant.Objective:To make the medical and chemical wastewater reach the CODCr standard before it inters downstream sewage treatment plants.Methods:A pilot study was conducted on the treatment of medical and chemical wastewater using a combined process of biochemical+Fenton oxidation+ozone catalytic oxidation+biological activated carbon.The concentration of CODCr of the pilot influent was 206~284 mg/L,and the pilot scale was 0.5 m3/h.The treatment effect of biochemical,Fenton oxidation,ozone catalytic oxidation and biological activated carbon on CODCr and the overall effect of the combined process were investigated respectively.Results:The average removal rates of CODCr by biochemical,Fenton oxidation,ozone catalytic oxidation and biological activated carbon processes were 35%,47%,23%and 34%,respectively,and the removal rates of combined processes were 83%.The effluent CODCr concentration was 36~47 mg/L,meeting the first-level A standard in the"Discharge Standards of Pollutant for Municipal Wastewater Treatment Plant"(GB 18918-2002).Conclusion:This combination process has good resistance to load impact and is suitable for the treatment of medical and chemical wastewater.
medical and chemical wastewaterbiochemicalFenton oxidationozone catalytic oxidationbiological activated carbon