Research Of Electric Catalytic Oxidation To Treat Butyl Xanthate And Amino-dithiophosphate Waste Water

Along with the life level promoting and rapid development of modern industry, the pollution caused by the each field is more and more serious, the harm to human beings is more severe, especially chemical industry, the industrial sewage discharges with high concentration, toxic, strong acid-base value, the refractory etc. Characteristics. The traditional method can’t completely remove it, and cost is higher, therefore this paper discusses a new way that electricity catalytic oxidation degradation of high concentration organic wastewater on the Ti/Ta2O5/IrO2electrode, choose the butylxanthate and amino-dithiophosphate for degradants, search best conditions of electric catalytic oxidation, probe the degradation path with electrochemical analysis and HPLC-MS, then use electrochemical catalytic oxidation and other methods combined to treat the actual wastewater from TieLing agentia Co., LTD, acquire good results, summarized as follows:The catalytic oxidation achieves better results to degrade low concentration organic wastewater, experimental result shows that adjust xanthate aqueous solution initial pH to4.3, control current density as20mA/cm2, adjust electrode gap for1cm, sodium sulfate as supporting electrolyte, in room temperature, electrolysis90min, then we could remove95%pollutants from1000mg/L butylxanthate, the CODCr removal rate reach to80%; And at the same condition adjust amino-dithiophosphate solution initial pH to9, electrolysis90min, make amino-dithiophosphate removal rate to80%, CODCr removal rate reach to more than70%.Through electrochemical analysis we know that the two pollutant solution all proceed oxidation reaction on the Ti/Ta2O5/IrO2electrode, and the reaction is irreversible; From the HPLC-MS analysis shows that hydroxyl radicals (·OH) makes butylxanthate decomposition to CS2, C4H9OH, CO2, SO2, hydroxyl radicals (·OH) continued to work on CS2, C4H9OH to degradation, will generate a variety valence sulfides; Amino-dithiophosphate react with alkali solution decomposition to aniline and phosphate, hydroxyl radicals (·OH) makes the hydrogen atoms on aniline amino be off, continue to oxidation as benzoquinone, and then the benzene began to fracture and generate the fatty acids compounds; The method can’t completely degradation the two sewage, final parts are oxidation to CO2and H2O, the rest organic matter contribute for CODCr value.The catalytic oxidation and other methods combined have better effect than anyone used alone, When treat high concentration organic wastewater which CODcr ranges from5000-10000mg/L with electrocatalytic oxidization and ozone oxidation combined:adjust pH to neutral, in room temperature, make the electrode gap as1cm, control the current density for lOmA/m2, the ozone flow for1L/min, and electrolysis and oxidation time for2h, actual wastewater CODCr removal rate reached to more than80%, then through the ultrafiltration device and activated carbon filter can make it standards. While flocculation-electricity catalytic oxidation degradation:adjust pH to5, treat butylxanthate with4000mg/L ferrous sulfate and1500mg/L calcium chloride firstly then electrolysis in definite conditions, the final CODCr reduced to300mg/L-500mg/L, while degrade amino-dithiophosphate with2000mg/L ferrous sulfate and1500mg/L calcium chloride firstly, then electrolysis in same conditions, the final CODCr reduced to500mg/L-800mg/L, and the ways all can improve the biodegradable.