初氧化—絮凝—再氧化集成法深度处理油田压裂废液实验研究

发布时间：2018-04-19 03:13

本文选题：压裂废液 + COD去除率　；参考：《东北石油大学》2015年硕士论文

【摘要】：压裂施工作为油田生产中重要的组成部分之一,也是增产、增注的重要措施。压裂作业后压裂废液的排放会对油田附近的地层以及水源造成污染。压裂废液中主要有原油、剩余压裂液、压裂返排液、有机还原性物质等污染物,并具有结构复杂、COD值高等特点。因此,对压裂废液进行深入研究,并设计新型、有效处理方案,可大大减少其对环境的污染。我国油田分布广阔,遍及全国。国家环保总局规定的所有工业污水必须达标排放,必须使用适合油田特点的压裂废水处理工艺和设备,确保达标排放已迫在眉睫。本文前期通过文献查阅了解油田压裂废液的来源、分类、组成、现状以及前景进行分析、归纳和总结,确定其主要污染物为废液中的原油、固体悬浮物和有机还原性物质。确定以降低控制COD值为主线,结合目前已经应用于现场的氧化-絮凝两步集成工艺,对两步集成法中使用的药剂及方法进行优化,通过设计不同的平行实验以测定其对COD去除率的影响来考察并选用氧化剂、催化剂、絮凝剂以及对其进行复配,选择合适的反应顺序、反应温度、反应pH值和反应时间,并提出采用高效氧化剂对两步集成法处理后的压裂废液进行再氧化深度处理。通过实验使各处理方法操作参数优化至理想状态,最大限度的提高COD去除率,达到工业污水排放标准。初氧化-絮凝-再氧化集成法流程包括对压裂废液的一次氧化、二次氧化调质、絮凝过滤、再氧化等步骤。在上述的过程中的每一阶段处理,均能将工艺参数做到最大程度的优化。COD去除率分别为25.79%、11.70%、24.93%、22.68%,总去除率为85.1%,COD值由初始1329mg/L降至198.1mg/L。
[Abstract]:Fracturing is one of the important components in oilfield production, and is also an important measure for increasing production and injection.The discharge of fracturing waste will pollute the formation and water sources near the oil field.The waste fracturing fluid mainly includes crude oil, residual fracturing fluid, fracturing fluid, organic reducing substance and so on, and has the characteristics of complex structure and high COD value.Therefore, the study of fracturing waste fluid and the design of a new and effective treatment scheme can greatly reduce the pollution to the environment.Oil fields in China are widely distributed throughout the country.All industrial sewage must be discharged according to the regulations of the State Environmental Protection Administration, and fracturing wastewater treatment technology and equipment suitable for oil field characteristics must be used, so it is urgent to ensure that the discharge standard is up to standard.In this paper, the source, classification, composition, present situation and prospect of fracturing waste fluid in oil field are analyzed, summarized and summarized. The main pollutants are crude oil, solid suspended matter and organic reducing substance.In order to reduce the control COD value as the main line, combined with the oxidation-flocculation two-step integrated process which has been applied in the field at present, the agents and methods used in the two-step integration method are optimized.The effects of different parallel experiments on COD removal rate were investigated by designing different parallel experiments. Oxidants, catalysts, flocculants and their combinations were selected, and the appropriate reaction order, reaction temperature, reaction pH and reaction time were selected.The high-efficiency oxidant is used to treat the fracturing waste liquid after two-step integrated treatment.The operation parameters of each treatment method are optimized to ideal state by experiment, and the removal rate of COD is increased to the maximum extent, which can reach the standard of industrial sewage discharge.The integrated process of initial oxidation-flocculation-reoxidation includes the steps of primary oxidation, secondary oxidation and tempering, flocculation filtration, reoxidation and so on.In each stage of the process, the optimum removal rate of the process parameters was 25.79 and 11.70 respectively, and the total removal rate was 85.1mgL / L from the initial 1329mg/L to 198.1 mg / L.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.1

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