本文關(guān)鍵詞： 電絮凝 油田壓裂廢水 去除率 反應(yīng)器 動力學(xué)　出處：《南京航空航天大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：來源于頁巖油氣開采的壓裂廢水具有成分復(fù)雜、有機(jī)物濃度高、產(chǎn)生量大等特點(diǎn),直接排放會破壞水體生態(tài)平衡,嚴(yán)重影響水體環(huán)境質(zhì)量。電絮凝法處理油田壓裂廢水,由于其設(shè)備小、占地面積少、運(yùn)行管理簡單、無需投加化學(xué)藥劑等優(yōu)點(diǎn),被稱為“環(huán)境友好型”技術(shù),日益受到人們的重視。本文通過對電絮凝反應(yīng)器的優(yōu)化設(shè)計(jì),自制電絮凝裝置對油田壓裂廢水的處理進(jìn)行研究。采用單因素分析法,討論間歇式壓裂廢水處理中電流密度、初始pH值、電極間距、容積比和電解時(shí)間對COD去除率的影響。實(shí)驗(yàn)研究表明:當(dāng)電流密度為70mA·cm-2、初始pH值為7.00、電極間距為7mm、容積比為1:1.2、電解時(shí)間70min時(shí),電絮凝處理壓裂廢水的效果最佳,COD去除率為84.75%。通過設(shè)計(jì)正交實(shí)驗(yàn),對實(shí)驗(yàn)影響因素進(jìn)行優(yōu)化,結(jié)果表明:電絮凝處理壓裂廢水影響因素的主次關(guān)系是初始pH值、電流密度、容積比、電極間距,優(yōu)化后的COD去除率達(dá)到90.55%。通過對流動式壓裂廢水進(jìn)行電絮凝實(shí)驗(yàn)分析其實(shí)用性,并討論電流密度、流速、初始pH值和電解時(shí)間對COD去除率的影響。實(shí)驗(yàn)研究表明:在自制的實(shí)驗(yàn)裝置中,當(dāng)電流密度為70mA·cm-2、流速為20mL·min-1、初始pH值為7.00、電解時(shí)間5min時(shí),COD去除率可達(dá)到63.22%以上。在流動式與間歇式研究基礎(chǔ)上,通過對COD去除率和能耗分析,表明流動式優(yōu)于間歇式處理方法。對電絮凝處理壓裂廢水進(jìn)行動力學(xué)分析,結(jié)果表明:該過程符合一級反應(yīng)動力學(xué)規(guī)律,動力學(xué)方程為:R=-0.048t2+3.780t+1.617,相關(guān)系數(shù)達(dá)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.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：X741

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