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为了解决元坝气田开发试气作业过程中产生的酸化试气废液污染环境的技术难题,针对酸化试气废液絮凝性差、可溶性有机物含量高和难降解的特点,在混凝处理工艺的基础上,采用微电解与活性炭处理相结合的处理方法。重点分析考察了微电解进水pH值、废水流速时间等因素对深度氧化处理效果的影响,最终确定出酸化试气废液深度处理的工艺条件:PH值为2-3;流速0.1-0.2m/min,反应后调节pH值为7.8,COD总去除率可达到96%左右。实验结果表明:酸化试气废液经混凝—微电解—活性炭吸附工艺处理后,净化水质达到《污水综合排放标准》(GB8978—1996)的1级标准。该工艺在元坝9井经现场应用取得良好效果。
In order to solve the technical problems of environmental pollution caused by acidified test gas during the test gas development in the Yuanba gas field, in view of the poor flocculation, high content of soluble organic matter and difficult degradation in the acidified test gas waste liquid, based on the characteristics of the coagulation process On the use of micro-electrolysis and activated carbon treatment combined approach. The influence of pH value of micro-electrolysis water and the flow velocity of waste water on the effect of deep oxidation treatment was analyzed emphatically. Finally, the technological conditions of deep treatment of acidified waste gas were determined: the pH was 2-3 and the flow rate was 0.1-0.2m / min, after adjusting the pH value of 7.8, COD removal rate can reach about 96%. The experimental results show that after the acidification waste gas is treated by the coagulation-micro-electrolysis-activated carbon adsorption process, the purified water quality meets the Grade 1 standard of Integrated Wastewater Discharge Standard (GB8978-1996). The technology in Yuanba 9 wells by the field application achieved good results.