超声辅助芬顿氧化降解油田压裂返排液*

Degradation of the Fracturing Flowback Fluid in the Oil Field Using Ultrasound-assisted Fenton Oxidation

刘波潮 高俊斌 曹宝升 许佩华 慕 朝 赵如松

LIU Bochao GAO Junbin CAO Baosheng XU Peihua MU Zhao ZHAO Rusong

压裂返排液的降解对保护环境、节约水资源具有重要意义。本文采用超声辅助芬顿试剂氧化的方法，对长 庆油田的高矿化度、高黏度返排液污水进行氧化降解，考察了不同因素对氧化降解反应的影响。研究表明，在适 宜的反应条件下，即H2O2与FeSO4摩尔比3.7∶1、超声功率120 W、反应温度20℃、反应时间18 min、反应液pH值 6.17（接近原水），水样的COD从10615.5 mg/L 降至2351.3 mg/L，COD去除率可达到77.85%，色度从2113. 8 CU 降至20.95 CU，浊度从47.88 NTU降至0.12 NTU，黏度从1.79 mPa·s降至1.02 mPa·s，矿化度从7130 mg/L降至 1045 mg/L。经超声辅助芬顿处理，可实现压裂返排液的快速降黏，大量脱除COD，极大地降低返排液的色度、浊 度，有利于后续深度处理。图12表1参7

Degradation of fracturing flowback fluid is significance for saving water resource and environment protection. In this paper，the oxidative degradation of the Changqing oil field sewage with high salinity and viscosity was carried out adopting the ultrasound-assisted Fenton oxidation method and the influence of different factors on the oxidative degradation reaction was investigated. Under appropriate reaction conditions that the molar ratio of H2O2 to FeSO4 was 3.7∶1，the ultrasound power was 120 W，the reaction temperature was 20℃，the reaction time was 18 min and the pH value was 6.17，the COD decreased from 10615.5 mg/L to 2351.3 mg/L ，the removal rate of COD reaching up to 77.85%；the chromaticity decreased from 2113. 8 CU to 20.95 CU， the turbidity decreased from 47.88 NTU to 0.12 NTU，the viscosity decreased from 1.79 mPa·s to 1.02 mPa·s，the salinity decreased from 7130 mg/L to 1045 mg/L. Ultrasonic assisted Fenton oxidation degradation of the flowback fluid could realize the decrease of viscosity and the removal of COD，greatly reduce the chromaticity and turbidity，which was advantageous for the following deep treatment.

10.19346/j.cnki.1000-4092.2020.02.030