Research on Standard Treatment of Fracturing Flowback Fluid Based on Advanced Oxi-dation Technology
Based on the requirements of high-efficiency and low-cost standard treatment of fracturing flowback fluid,the treatment effects of single advanced oxidation technologies such as high-voltage pulse,ozone,and Fenton oxidation on waste fluid is studied respectively.The optimal reaction condi-tions of the combined process are investigated,and the combined process is used for long-term evalua-tion on site.The results show that the treatment effect of high-voltage pulse is the best in single tech-nology,followed by Fenton oxidation and ozone oxidation.The single technology cannot meet the re-quirements of GB 18918-2002"Pollutant Discharge Standards for Urban Wastewater Treatment Plants".The effluent water quality of the combined high-voltage pulse-ozone and high-voltage pulse-Fenton oxidation processes meets the requirements of the standard.The optimal conditions of the first-stage process are pulse voltage of 30 kV,pulse width of 60 ns,pulse frequency of 100 Hz,ozone dosage of 1.5 g/h,initial pH value of 7,ozone inlet time of 30 min.The optimal conditions of the two-stage process are pulse voltage of 30 kV,pulse width of 60 ns,pulse frequency of 100 Hz,and initial pH value of 5.Through the long-term effect experiment for 50 days,the removal effect of oil,suspended matter,COD,and nitrogen ammonia is good.The combined process has a good adaptability to the fluctuation of inlet water quality.
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