气田压裂返排液氧化处理实验研究
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摘要
以四川某气田压裂返排液为研究对象,采用破胶絮凝处理后进行氧化对比实验,氧化剂选用高锰酸钾、过硫酸钾、次氯酸钠、Fenton试剂。研究表明,絮凝实验最佳条件为氧化钙、硫酸铝和硫酸亚铁投加量分别为3,1,1 g/L。4种氧化方法的最佳实验条件为:高锰酸钾投加量0.5 g/L,pH值为4;过硫酸钾投加量0.25g/L,pH值为6;次氯酸钠投加量15 g/L,pH值为4;Fenton氧化方法pH值为3.5,双氧水投加量25 g/L,七水硫酸亚铁投加量10 g/L。出水COD_(Cr)最多可降至800 mg/L左右,最大COD_(Cr)去除率72.96%,处理效果良好,为后续处理创造了条件。
The oxidation experiment of fracturing flowback fluid from a gas field in Sichuan after gel breaking and flocculation was conducted.Potassium permanganate,potassium persulfate,sodium hypochlorite,Fenton reagent were selected as oxidant.The results showed that:the optimum experimental condition for flocculation experiment could be reached with the additive of calcium oxide,aluminum sulfate,and ferrous sulfate of 3,1,1 g/L,respectively.The best experimental condition for oxidation experiment could be achieved with a dosing quantity of 0.5 g/L of potassium permanganate at pH 4;0.25 g/L of potassium persulfate at pH 6; 15 g/L of sodium hypochlorite at pH 4; 25 g/L of hydrogen peroxide and 10 g/L of ferrous sulfate heptahydrate at pH 3.5.The effluent COD_(Cr) after the treatment could be reduced to about 800 mg/L,with the maximum COD_(Cr)removal rate of 72.96%,which could generate a plausible condition for the treatment afterwards.
The oxidation experiment of fracturing flowback fluid from a gas field in Sichuan after gel breaking and flocculation was conducted.Potassium permanganate,potassium persulfate,sodium hypochlorite,Fenton reagent were selected as oxidant.The results showed that:the optimum experimental condition for flocculation experiment could be reached with the additive of calcium oxide,aluminum sulfate,and ferrous sulfate of 3,1,1 g/L,respectively.The best experimental condition for oxidation experiment could be achieved with a dosing quantity of 0.5 g/L of potassium permanganate at pH 4;0.25 g/L of potassium persulfate at pH 6; 15 g/L of sodium hypochlorite at pH 4; 25 g/L of hydrogen peroxide and 10 g/L of ferrous sulfate heptahydrate at pH 3.5.The effluent COD_(Cr) after the treatment could be reduced to about 800 mg/L,with the maximum COD_(Cr)removal rate of 72.96%,which could generate a plausible condition for the treatment afterwards.
引文
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[2]李兰,杨旭,杨德敏.油气田压裂返排液治理技术研究现状[J].环境工程,2011,29(4):54-56.
[3]赵萧萧,石会龙,吴伟峰,等.油田压裂返排液处理工艺的研究现状及展望[J].山东化工,2018,47(2):57-61.
[4]管保山,梁利,赵金洲,等.压裂返排液取水应用技术[J].石油学报,2017,38(1):99-104.
[5]韩卓,郭威,张太亮,等.非常规压裂返排液回注处理实验研究[J].石油与天然气化工,2014,43(1):108-112.
[6]吴俊奇,吴文熙,颜懿柔,等.压裂返排液处理现状及难点研究[J].水处理技术,2018,44(8):12-16.
[7]周道琢,史晓琼,李斌,等.压裂返排液处理技术研究[J].石油化工应用,2018,37(6):97-99.
[8]郭怡莹,王永飞,赵晓舒.氧化法处理高COD废水[J].辽宁化工,2010,39(8):865-868.
[9]胡志勇,张太亮,朱之庆,等.混凝-高级氧化组合工艺处理压裂返排液研究[J].工业水处理,2018,38(7):81-84.
[10]林海,李笑晴,董颖博,等.破胶絮凝-预氧化-深度氧化处理压裂返排液[J].科学技术与工程,2014,14(19):155-158.
[11]刘斌,陶莹,周琦.高锰酸钾预氧化技术在水处理中的适用性[J].山西建筑,2010,36(1):191-192.
[12]肖灵,程斌,莫建松,等.次氯酸钠湿法烟气脱硝及同时脱硫脱硝技术研究[J].环境科学学报,2011,31(6):1175-1180.
[13]俞音,蒋勇军.油气田压裂返排液复合氧化处理技术实验研究[J].新疆环境保护,2017,39(2):33-40.
[14]柴思琪,樊祥博,李明,等.油田压裂返排液处理研究进展[J].山东化工,2018,47(1):34-36.
[15]樊晓丽,于勇勇,姚佐国,等.压裂返排液无害化处理研究[J].环境工程,2016(34):196-199.
[16]孙建辉,孙胜鹏,王慧亮,等.Fenton氧化技术处理难降解工业有机废水研究进展[J].工业水处理,2006,26(12):9-13.
[17]陈胜兵,何少华,娄金,等.Fenton试剂的氧化作用机理及其应用[J].环境科学与技术,2004,27(3):105-108.