电絮凝处理油田压裂废水的研究及动力学分析

发布时间：2018-01-29 22:06

本文关键词： 电絮凝油田压裂废水去除率反应器动力学　出处：《南京航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：来源于页岩油气开采的压裂废水具有成分复杂、有机物浓度高、产生量大等特点,直接排放会破坏水体生态平衡,严重影响水体环境质量。电絮凝法处理油田压裂废水,由于其设备小、占地面积少、运行管理简单、无需投加化学药剂等优点,被称为“环境友好型”技术,日益受到人们的重视。本文通过对电絮凝反应器的优化设计,自制电絮凝装置对油田压裂废水的处理进行研究。采用单因素分析法,讨论间歇式压裂废水处理中电流密度、初始pH值、电极间距、容积比和电解时间对COD去除率的影响。实验研究表明:当电流密度为70mA·cm-2、初始pH值为7.00、电极间距为7mm、容积比为1:1.2、电解时间70min时,电絮凝处理压裂废水的效果最佳,COD去除率为84.75%。通过设计正交实验,对实验影响因素进行优化,结果表明:电絮凝处理压裂废水影响因素的主次关系是初始pH值、电流密度、容积比、电极间距,优化后的COD去除率达到90.55%。通过对流动式压裂废水进行电絮凝实验分析其实用性,并讨论电流密度、流速、初始pH值和电解时间对COD去除率的影响。实验研究表明:在自制的实验装置中,当电流密度为70mA·cm-2、流速为20mL·min-1、初始pH值为7.00、电解时间5min时,COD去除率可达到63.22%以上。在流动式与间歇式研究基础上,通过对COD去除率和能耗分析,表明流动式优于间歇式处理方法。对电絮凝处理压裂废水进行动力学分析,结果表明:该过程符合一级反应动力学规律,动力学方程为:R=-0.048t2+3.780t+1.617,相关系数达到0.9877。
[Abstract]:Fracturing wastewater derived from shale oil and gas exploitation has the characteristics of complex composition, high concentration of organic matter, large amount of production, and so on. Direct discharge will destroy the ecological balance of water body. The treatment of fracturing wastewater by electroflocculation is called "environment-friendly" technology because of its advantages such as small equipment, small area, simple operation and management, no need to add chemical agents and so on. More and more attention has been paid to the treatment of fracturing wastewater in oilfield by optimizing design of electroflocculation reactor and self-made electric flocculation device. Single factor analysis method is used in this paper. The effects of current density, initial pH value, electrode spacing, volume ratio and electrolysis time on the removal rate of COD in intermittent fracturing wastewater treatment are discussed. The experimental results show that the current density is 70 Ma 路cm-2. When the initial pH value is 7.00, the electrode spacing is 7mm, the volume ratio is 1: 1.2, and the electrolysis time is 70 min, the effect of electroflocculation treatment on fracturing wastewater is the best. The removal rate of COD is 84.75. By designing orthogonal experiment, the experimental factors are optimized. The results show that the primary and secondary relationship of the influencing factors of electroflocculation treatment of fracturing wastewater is initial pH value and current density. The volume ratio, electrode spacing and optimized COD removal rate are 90.55. The practicability of electroflocculation experiment is analyzed, and the current density and flow rate are discussed. The effect of initial pH value and electrolysis time on the removal rate of COD was studied. The experimental results showed that the current density was 70 Ma 路cm ~ (-2) and the flow rate was 20 mL 路min-1 in a self-made experimental device. When the initial pH value was 7.00 and the electrolysis time was 5 minutes, the removal rate of COD could reach more than 63.22%. On the basis of mobile and intermittent research, the removal rate and energy consumption of COD were analyzed. The kinetic analysis of the treatment of fracturing wastewater by electroflocculation shows that the process accords with the first-order reaction kinetics. The kinetic equation is: 1: r-0.048 t 23.780 t 1.617, the correlation coefficient is 0.9877.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X741

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