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《Natural Gas Industry》 2012-08
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An experimental study of waste drilling fluids treated by the combination of sonication and ozonation

Zhang Tailiang1,Zhao Deyin2,Su Li1(1.Jiangyou Urban Environmental Supervision Station of the Sichuan Province,Jiangyou,Sichuan 621700,China;2.Southwest Petroleum University,Chengdu,Sichuan 610500,China)  
The commonly used methods of treating waste drilling fluids in the world mainly include direct emissions,landfill,sealed pits,land cultivation,curing,incineration,bioassay,etc.However,all the above methods are not good enough to treat waste drilling fluids in fields owing to a high treatment cost,an incomplete treatment,and a narrow application scope.The clincher of waste drilling fluids treatment is the coagulation,the destabilization of colloids by addition of chemicals that neutralize the negative charges.In view of this,this paper first introduces the components,features,potential hazards of waste drilling fluids as well as the present status of treatment all over the world.Then,according to the mechanism of sonochemistry and ozone oxidation,the technology of sonication combined with ozonation is put forward to treat waste drilling fluids so as to reach the standards.Through the experimental analysis of the influencing factors of this technology,the optimal treatment process is determined as follows.First,sonochemical coagulation and destabilization treatment: sound intensity of 30 W/cm2,acoustic frequency of 35 kHz,the O3 content of 1000 mg/L,operation time of 20 min,and the addition of inorganic coagulant PAC of 0.6%.Second,sonochemical ozone oxidation treatment to reach the standards: sound intensity of 35 W/cm2,acoustic frequency of 35 kHz,the O3 content of 1000 mg/L,reaction time of 20 min.Meanwhile,the SEM analysis is done of the surface characteristics of flocs after the treatment and the mechanism of coagulation is also studied.The results of this experimental study show that this new technology has advantages such as less addition of chemical reagents,a low degree of secondary pollution,low cost of chemical reagents,obvious treatment effects,and so forth;and the most important of all,the waste drilling fluids will be discharged after being treated by this new method,which completely meets the emission standard.
【Fund】: 国家自然科学基金项目(编号:50674077);; 四川省教育厅重点项目“声化学复合催化氧化处理四川普光气田含硫废液研究”(编号:07ZA114)
【CateGory Index】: X741
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