Study on Pretreatment of Detecting Wastewater from Natural Gas Purification by Fenton Oxidation

[Objective] The study was to discuss the pretreatment effect of detecting wastewater from natural gas purification by Fenton oxidation.[Method] The detected wastewater from natural gas purification was made for the Fenton oxidation pretreatment,the effects of pH,H2O2 concn.,the ratio of H2O2 and Fe2+,the reaction temperature and time on the COD removal were studied,the optimum reaction condition was confirmed and biodegradability of the detected wastewater before and after the Fenton oxidation was investigated.[Result] The optimal reaction conditions for Fenton oxidation operating were as follows: the adding dosage of H2O2 was 0.3 mol/L,the ratio of H2O2 and Fe2+ was 20∶1,the initial pH value was 3 and the time of reaction at 70 ℃ was 40 min,under which,COD was decreased from 18-22 g/L to 3 852-4 708 mg/L,with COD removal up to 78.6%.After the pretreatment of detected wastewater from natural gas purification by Fenton oxidation,the properties of biochemistry were improved greatly,therefore,Fenton oxidation,as a pretreatment of UASB,brought about a remarkable effect.[Conclusion] Analysis from the Environment economy showed that Fenton oxidation treatment combined with UASB not only got good effect and low cost,but also could control the total sewage water discharge,which had wide application foreground.