General pretreatment processes of ammonia stripping and phenols solvent extraction can reduce the concentration of toxic compounds of the coal gasification wastewater for the following biological treatment. However, s...General pretreatment processes of ammonia stripping and phenols solvent extraction can reduce the concentration of toxic compounds of the coal gasification wastewater for the following biological treatment. However, some emulsified coal tar still exists in the influent and many substances in coal tar are refractory and toxic to microorganisms. This study is mainly on the removal of emulsified coal tar by acidification demulsion. The experimental results show that the acidification process of the wastewater by pure hydrochloric acid can reduce the chemical oxygen demand （COD）, total organic carbon （TOC）, total phenolics and oil about 3.1%-11.3%, 6%-- 10.8%, 5.3%--8.6% and 25.2%--57.4% respectively with pH value in the range of 4 to 7. The analysis of molecular weight distribution indicates that compounds removed from the wastewater by this process are large molecular substances. The experiment also shows that the efficiency of COD removal in the demulsion process by different acids is different and the phosphoric acid is prominent. The preserved time of the wastewater also affects the efficiency of demulsion. Small amount low-cost solid additives including kaolin and diatomite can improve the rate of coal tar sedimentation and enhance the removal efficiency of organics in the phosphoric acidification process.展开更多
伊拉克Lukoil West Qurna-2(又名卢克石油有限公司,西古尔纳二期)油田外输原油含水含盐经常高出合格标准要求,破乳剂的应用与优化迫在眉睫。通过DPY-2A型电脱盐实验仪和瓶试法对比实验,考察实验温度和加药浓度对破乳剂脱水效果的影响,...伊拉克Lukoil West Qurna-2(又名卢克石油有限公司,西古尔纳二期)油田外输原油含水含盐经常高出合格标准要求,破乳剂的应用与优化迫在眉睫。通过DPY-2A型电脱盐实验仪和瓶试法对比实验,考察实验温度和加药浓度对破乳剂脱水效果的影响,优选出适应于伊拉克Lukoil West Qurna-2油田的复配破乳剂RD-2310。瓶试数据证明,在加药浓度为100 mg/L,实验温度80℃时,其破乳脱水性能优于现场在用的破乳剂,表现出较快的脱水速率,较高的脱水量,脱出的自由水水质较为清澈,油水界面处齐平并无乳化层。中实验证证明,从9月26日~9月28日,连续3天中实验证后,随着复配破乳剂RD-2310的加药浓度的逐渐优化降低至最佳加药浓度40 mg/L,电脱盐出口的原油含盐逐渐下降并维持稳定在27~28 mg/kg之间,电脱盐出口的原油含水数据维持在0.14%~0.2%vol之间,满足伊拉克Lukoil West Qurna-2油田外输原油含水含盐的合格标准,在生产设备中避免了出现设备内部原油挂壁问题,从而间接的提高原油的单日产量,降低了后续流程中脱出的自由水的净化处理成本。展开更多
文摘General pretreatment processes of ammonia stripping and phenols solvent extraction can reduce the concentration of toxic compounds of the coal gasification wastewater for the following biological treatment. However, some emulsified coal tar still exists in the influent and many substances in coal tar are refractory and toxic to microorganisms. This study is mainly on the removal of emulsified coal tar by acidification demulsion. The experimental results show that the acidification process of the wastewater by pure hydrochloric acid can reduce the chemical oxygen demand （COD）, total organic carbon （TOC）, total phenolics and oil about 3.1%-11.3%, 6%-- 10.8%, 5.3%--8.6% and 25.2%--57.4% respectively with pH value in the range of 4 to 7. The analysis of molecular weight distribution indicates that compounds removed from the wastewater by this process are large molecular substances. The experiment also shows that the efficiency of COD removal in the demulsion process by different acids is different and the phosphoric acid is prominent. The preserved time of the wastewater also affects the efficiency of demulsion. Small amount low-cost solid additives including kaolin and diatomite can improve the rate of coal tar sedimentation and enhance the removal efficiency of organics in the phosphoric acidification process.
文摘伊拉克Lukoil West Qurna-2(又名卢克石油有限公司,西古尔纳二期)油田外输原油含水含盐经常高出合格标准要求,破乳剂的应用与优化迫在眉睫。通过DPY-2A型电脱盐实验仪和瓶试法对比实验,考察实验温度和加药浓度对破乳剂脱水效果的影响,优选出适应于伊拉克Lukoil West Qurna-2油田的复配破乳剂RD-2310。瓶试数据证明,在加药浓度为100 mg/L,实验温度80℃时,其破乳脱水性能优于现场在用的破乳剂,表现出较快的脱水速率,较高的脱水量,脱出的自由水水质较为清澈,油水界面处齐平并无乳化层。中实验证证明,从9月26日~9月28日,连续3天中实验证后,随着复配破乳剂RD-2310的加药浓度的逐渐优化降低至最佳加药浓度40 mg/L,电脱盐出口的原油含盐逐渐下降并维持稳定在27~28 mg/kg之间,电脱盐出口的原油含水数据维持在0.14%~0.2%vol之间,满足伊拉克Lukoil West Qurna-2油田外输原油含水含盐的合格标准,在生产设备中避免了出现设备内部原油挂壁问题,从而间接的提高原油的单日产量,降低了后续流程中脱出的自由水的净化处理成本。
