本文選題：電絮凝 + 質(zhì)量傳遞�。� 參考：《江蘇科技大學》2015年碩士論文

【摘要】：近年來,重金屬廢水污染事件頻繁發(fā)生,電絮凝(EC)是處理重金屬廢水的一個重要技術(shù)。它也常常被用于難降解有機物廢水的處理。EC過程是由電極電化學反應(yīng)、物質(zhì)質(zhì)量傳遞、水解反應(yīng)和吸附反應(yīng)等多個過程組成,各個過程之間形成相互影響、相互作用的耦合關(guān)系。正是各過程之間復雜的耦合關(guān)系使得實驗研究和工藝改進的難度增大,制約了機理研究的進一步深入。由于EC過程由絮體的產(chǎn)生,絮體的運移及絮體的吸附三個過程組成,而絮體的產(chǎn)生及分布過程對污染物的去除效率產(chǎn)生重要的影響,因此本文建立了EC過程中電極電化學反應(yīng)和水解反應(yīng)模型,同時建立了EC電解和水解產(chǎn)物的質(zhì)量傳遞和動量傳遞模型,并計算求解,對連續(xù)電絮凝過程中各物種的產(chǎn)生和傳質(zhì)規(guī)律進行研究。研究發(fā)現(xiàn),電解產(chǎn)生的Al3+主要分布在陽極附近,OH-分布在陰極附近,沿流程方向兩離子的量都逐漸地減少。在電解槽的前段,離子的濃差極化較弱,水解反應(yīng)為控制步驟;在電解槽的中段和后段,離子的濃差極化較強,傳質(zhì)為控制步驟。隨著電流密度的增大,Al3+和OH-的濃度也增加;在無水解的情況下,離子的濃差極化較弱,整個電解槽溶液顯弱堿性。水解產(chǎn)物中溶解鋁主要分布在兩電極附近,而絮體鋁主要分布在兩電極中間位置,同時整個電解槽中絮體鋁占主要地位。沿流程方向,絮體鋁占總鋁的百分比逐漸增加,溶解鋁占總鋁的百分比逐漸減小。研究還發(fā)現(xiàn),在電遷移和對流的共同作用下絮體主要分布在電解槽后段的極板間的中間位置,而靠近陰極區(qū)域絮體的量幾乎為0。沿著流體流動方向絮體的量增大,電解通道中絮體的生成量隨電流密度和停留時間的增加而增加,而在初始pH值為5-7的范圍幾乎不發(fā)生變化。同時發(fā)現(xiàn)電解槽通道中,垂直于電極方向上,絮體的分布不受停留時間、電流密度及初始pH的影響。
[Abstract]:In recent years, heavy metal wastewater pollution incidents occur frequently, and electroflocculation (ECC) is an important technology to treat heavy metal wastewater. It is also often used in the treatment of refractory organic wastewater. EC process is composed of electrochemical reaction of electrode, mass transfer of substance, hydrolysis reaction and adsorption reaction. The coupling of interactions. It is the complicated coupling relationship between the processes that makes the experimental research and process improvement more difficult, which restricts the further study of mechanism. The EC process consists of three processes: floc generation, floc transport and floc adsorption, and the floc generation and distribution process have an important effect on the removal efficiency of pollutants. In this paper, the electrochemical reaction and hydrolysis reaction model of electrode in EC process is established, and the mass transfer and momentum transfer model of EC electrolysis and hydrolysate are established, and the solution is calculated. The generation and mass transfer of species during continuous electrocoagulation were studied. It is found that the Al3 produced by electrolysis mainly distributes in the cathode near the anode, and the amount of the two ions decreases gradually along the flow direction. In the front section of the electrolyzer, the concentration polarization of the ion is weak, the hydrolysis reaction is the control step, and the concentration polarization of the ion is stronger in the middle and the later part of the cell, and the mass transfer is the control step. The concentration of Al3 and OH- also increased with the increase of current density, and the concentration polarization of ions was weak without hydrolysis, and the whole electrolytic cell solution showed weak alkalinity. The dissolved aluminum in the hydrolyzed product mainly distributes near the two electrodes, while the floc aluminum mainly distributes in the middle position of the two electrodes, and the floc aluminum occupies the main position in the whole electrolysis cell. Along the flow direction, the percentage of floc aluminum to total aluminum increases gradually, while the percentage of dissolved aluminum to total aluminum decreases gradually. It is also found that the floc mainly distributes in the middle position between the polar plates in the back section of the electrolytic cell under the combined action of electromigration and convection, and the amount of floc near the cathode area is almost 0. The amount of floc in the electrolytic channel increases with the increase of current density and residence time, but almost does not change in the range of initial pH value of 5-7. At the same time, it is found that the distribution of floc is not affected by residence time, current density and initial pH in the electrolytic cell channel perpendicular to the electrode direction.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

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