Research and Application of Flocculant for Oilfield Wastewater Treatment Based on Fracturing Wastewater

Abstract

Abstract In view of the characteristics of high viscosity, high turbidity and high oil content in the oilfield fracturing operation wastewater, the Fenton oxidation-flocculation treatment method is used to reinject the fracturing wastewater, and the pH value, Fenton reagent and flocculation of the wastewater The dosage of agent and the time interval of adding flocculant to the effect of fracturing wastewater oxidation and flocculation treatment. The results show that: according to the conditions of 30% hydrogen peroxide (volume percentage) dosage of 0.2% and FeSO4 dosage of 20mg / L Fenton oxidation was carried out for 30min, and then flocculation treatment was carried out under the conditions of PAC dosage of 70mg / L, PAM dosage of 3mg / L, and stirring speed of 100r / min for 30min, then into the SBR reactor for 8h aeration and sedimentation for 1h, then treated The COD of post-fracturing wastewater decreased from 4132.92mg / L to 190.38mg / L, and its removal rate could reach 95.4%. The combined process has far better treatment effect on wastewater than the single micro-electrolysis, Fenton oxidation or flocculation process, and the method is simple and easy to use, and the utilization rate of the agent is high.