电絮凝处理胍胶压裂返排废水实验研究
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摘要
为节约油田水资源,同时减少压裂处理中的废水排放,提出将胍胶压裂返排废水处理后回用。针对返排废水成分复杂、量大不集中、易发生腐败变臭、难处理等特点,采用电絮凝技术对其进行处理。结果表明,不加入任何化学药剂,以Al为极板,电流密度123.5～185.2 A/m~2、极板间距40 mm,输出电流4～6A,处理时间20～30 min的条件下,可实现快速脱稳沉降分离,处理后返排废水的浊度≤16.1 NTU,离子组成不发生变化,水样中的大分子有机物残留量显著下降,絮凝残渣以无定型晶体无机物KCl为主,水质各项指标达到油田现场回用要求。
To save the water resources and also reduce the wastewater discharged in the oilfields, the reuse of treated guargum fracturing wastewater was proposed. Aimed at the fracturing wastewater is difficult to handle due to complex composition, large amount but hard to centralize, and easy to corrupt and stink, the electrocoagulation technology was applied to treat the wastewater. The results showed that, by using the following conditions: without chemical agent dosage, Al as electrode plates, the current density was 123.5～185.2 A/m~2, the output current was 4～6 A, the plate spacing was 40 mm, and the treat time was 20～30 min, a rapid destabilization and settling separation was achieved. The turbidity of the treated wastewater was less than 16.1 NTU, the ions of the water sample did not change before and after the treatment, the residual amount of macromolecule organic compounds in water samples decreased significantly and the flocculation residue was mainly amorphous crystal KCl-based inorganic substance, and the indexes of the water quality reached the reuse requirements in oilfield.
To save the water resources and also reduce the wastewater discharged in the oilfields, the reuse of treated guargum fracturing wastewater was proposed. Aimed at the fracturing wastewater is difficult to handle due to complex composition, large amount but hard to centralize, and easy to corrupt and stink, the electrocoagulation technology was applied to treat the wastewater. The results showed that, by using the following conditions: without chemical agent dosage, Al as electrode plates, the current density was 123.5～185.2 A/m~2, the output current was 4～6 A, the plate spacing was 40 mm, and the treat time was 20～30 min, a rapid destabilization and settling separation was achieved. The turbidity of the treated wastewater was less than 16.1 NTU, the ions of the water sample did not change before and after the treatment, the residual amount of macromolecule organic compounds in water samples decreased significantly and the flocculation residue was mainly amorphous crystal KCl-based inorganic substance, and the indexes of the water quality reached the reuse requirements in oilfield.
引文
[1]田培蓉.胍胶压裂返排废水重复利用影响因素及消除方法研究[D].西安:西安石油大学,2017.
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[10]杨志刚,魏彦林,吕雷,等.页岩气压裂返排废水回用处理技术研究与应用[J].天然气工业,2015,35(5):131-137.
[11]EZECHI E H,ISA M H,KUTTY S R M,et al.Boron removal from produced water using electrocoagulation[J].Process Saf Environ Prot,2014,92(6):509-514.
[12]YIN X Q,JING B,CHEN W J,et al.Study on COD removal mechanism and reaction kinetics of oilfield wastewater[J].Water Sci Technol,2017,76(10):2655-2663.
[13]任美洁,宋永会,曾萍,等.脉冲电絮凝法处理黄连素制药废水[J].环境科学研究,2010,23(7):892-896.
[14]碎屑岩油藏注入水水质指标及分析方法:SY/T 5329-2012[S].
[15]油田水分析方法:SY/T 5523-2016[S].
[16]饮用天然矿泉水检验方法:GB/T 8538-2008[S].
[17]水质石油类红外分光光度法:HJ 637-2012[S].
[18]LIU Q,CHEN W J,JING B,et al.Spectrum analysis of trace hydrogen peroxide in electrochemical process[J].Spectrosc Spect Anal,2017,37(5):1656-1660.
[2]张爱涛,卜龙利,廖建波.微波工艺处理油田酸化压裂废水的应用[J].化工进展,2009,28(s2):138-142.
[3]汪卫东,袁长忠.油气田压裂返排废水处理技术现状及发展趋势[J].油气田地面工程,2016,35(10):1-5.
[4]王佳,李俊华,雷珂,等.压裂返排废水处理技术研究进展[J].应用化工,2017,46(7):1414-1416.
[5]林啸,姚媛元,陈果.胍胶压裂返排废水残渣净化处理技术[J].石油钻采工艺,2016,38(5):689-692.
[6]刘宇程,吴东海,袁建梅,等.膜蒸馏处理页岩气井压裂返排废水[J].环境工程学报,2017,1(1):48-54.
[7]蒋继辉,冀忠伦,任小荣,等.聚合硅酸铝铁絮凝剂处理油井压裂废水[J].化工环保,2013,3(4):363-366.
[8]LESTER Y,YACOB T,MORRISSEY I,et al.Can we treat hydraulic fracturing flowback with a conventional biological process?The case of guar gum[J].Environ Sci Technol Let,2013,1(1):133-136.
[9]李健,赵立志,刘军,等.压裂返排废液达标排放的实验研究[J].油气田环境保护,2002,12(3):26-28.
[10]杨志刚,魏彦林,吕雷,等.页岩气压裂返排废水回用处理技术研究与应用[J].天然气工业,2015,35(5):131-137.
[11]EZECHI E H,ISA M H,KUTTY S R M,et al.Boron removal from produced water using electrocoagulation[J].Process Saf Environ Prot,2014,92(6):509-514.
[12]YIN X Q,JING B,CHEN W J,et al.Study on COD removal mechanism and reaction kinetics of oilfield wastewater[J].Water Sci Technol,2017,76(10):2655-2663.
[13]任美洁,宋永会,曾萍,等.脉冲电絮凝法处理黄连素制药废水[J].环境科学研究,2010,23(7):892-896.
[14]碎屑岩油藏注入水水质指标及分析方法:SY/T 5329-2012[S].
[15]油田水分析方法:SY/T 5523-2016[S].
[16]饮用天然矿泉水检验方法:GB/T 8538-2008[S].
[17]水质石油类红外分光光度法:HJ 637-2012[S].
[18]LIU Q,CHEN W J,JING B,et al.Spectrum analysis of trace hydrogen peroxide in electrochemical process[J].Spectrosc Spect Anal,2017,37(5):1656-1660.