本文關(guān)鍵詞： 無膜電去離子(MFEDI) 高純水 離子交換樹脂 電再生 樹脂選擇 水回收率 再生能耗　出處：《浙江大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：無膜電去離子(MFEDI)是本課題組研發(fā)的一項(xiàng)全新電去離子技術(shù),其特征是在樹脂層兩端安放一對陰陽電極,采取交換處理與電再生交替操作。處理時(shí),如同普通離子交換一樣,依靠樹脂的強(qiáng)交換能力除去水中的雜質(zhì)離子；電再生時(shí),對樹脂層施加直流電使離子交換平衡朝著再生反應(yīng)的方向移動,同時(shí)通以純水將再生出來的離子排出樹脂層。MFEDI工藝清潔,操作簡便,因此在高純水制備領(lǐng)域擁有十分廣闊的應(yīng)用前景。 離子交換樹脂是MFEDI的核心,樹脂的特性和填充方式對MFEDI的凈化效果和電再生性能影響很大。目前,MFEDI采用單層床弱酸強(qiáng)堿樹脂制備高純水存在凈化效果不佳、再生電壓過高等問題,限制了該技術(shù)在高純水制備領(lǐng)域的推廣應(yīng)用。因此,進(jìn)行MFEDI樹脂選擇及其床層結(jié)構(gòu)優(yōu)化研究,進(jìn)而提高M(jìn)FEDI制備高純水性能,對該技術(shù)的發(fā)展具有重要意義。 本論文系統(tǒng)地研究了適用于高純水制備的雙層床與多層床MFEDI技術(shù)。雙層床是在MFEDI中,下層填充弱酸強(qiáng)堿樹脂,上層填充強(qiáng)酸強(qiáng)堿樹脂。多層床是在MFEDI中,樹脂層每隔10cm插入一層強(qiáng)堿樹脂。研究工作主要包括三部分：樹脂選擇、雙層床MFEDI制備高純水性能考察、多層床MFEDI制備高純水性能考察。 研究結(jié)果表明,弱酸強(qiáng)堿樹脂和強(qiáng)酸強(qiáng)堿樹脂均具備良好的去離子能力、電再生性能和導(dǎo)電性,適用于MFEDI制備高純水研究。弱酸強(qiáng)堿樹脂失效后容易獲得電再生,但去離子能力和導(dǎo)電性不如強(qiáng)酸強(qiáng)堿樹脂,可填充于MFEDI的進(jìn)水端用以除去水中的大部分離子,并提高再生效果；強(qiáng)酸強(qiáng)堿樹脂具有極佳的去離子能力和導(dǎo)電性,但電再生效果較差,可填充于MFEDI的出水端用以保證出水水質(zhì),并提高樹脂層導(dǎo)電性。 雙層床MFEDI能有效地電再生失效離子交換樹脂,經(jīng)多次電再生后樹脂仍然保持良好的處理效果,出水電導(dǎo)率為0.056～0.059μS/cm,滿足高純水水質(zhì)要求。電再生過程,倒極可有效抑制離子的逆向電遷移,并使再生液pH值趨于中性。與單層術(shù)MFEDI相比,雙層床MFEDI的凈化效果和電再生性能均顯著提高。電再生機(jī)理研究證實(shí),樹脂電再生所需H+和OH-離子主要由樹脂間的水分解反應(yīng)和電極的電解反應(yīng)提供,前者貢獻(xiàn)高于80%,后者貢獻(xiàn)低于20%。 利用強(qiáng)堿樹脂層的阻斷作用,多層床MFEDI可有效抑制陽離子的逆向電遷移,避免了MFEDI因頻繁倒極導(dǎo)致再生液電導(dǎo)率下降、再生電壓升高和電極損壞等問題。多層床MFEDI可長期穩(wěn)定制備高純水,30個制水周期內(nèi),出水電導(dǎo)率保持在0.055～0.060μS/cm之間,未出現(xiàn)水質(zhì)惡化的趨勢,水回收率90%,再生能耗0.71kWh/m3。
[Abstract]:MFEDI is a new electrodeionization technology developed by our team, which is characterized by the placement of a pair of anode and cathode electrodes at both ends of the resin layer and the alternating operation of exchange treatment and electrical regeneration. Depending on the strong exchange ability of the resin to remove impurity ions in water, direct current is applied to the resin layer during electrical regeneration so that the ion exchange equilibrium moves towards the direction of regeneration reaction. At the same time, pure water is used to remove the regenerated ions from resin layer. MFEDI process is clean and easy to operate, so it has a very broad application prospect in the field of high purity water preparation. Ion exchange resin is the core of MFEDI. The characteristics and filling methods of the resin have a great influence on the purification and electrical regeneration of MFEDI. At present, the preparation of high purity water by monolayer weakly acid-alkali resin has poor purification effect. The problems of high regeneration voltage limit the application of this technology in the preparation of high purity water. Therefore, the selection of MFEDI resin and the optimization of the bed structure are carried out to improve the performance of MFEDI in the preparation of high pure water. It is of great significance to the development of this technology. In this paper, the technology of double bed and multilayer bed MFEDI, which is suitable for the preparation of high purity water, is studied systematically. The double bed is filled with weak acid and strong base resin in MFEDI, and the upper layer is filled with strong acid and strong base resin. The multilayer bed is in MFEDI. A layer of strong alkali resin is inserted into the resin layer every 10 cm. The research work mainly includes three parts: selection of resin, study on the preparation of high pure water by MFEDI in double bed, and study on the preparation of high pure water in multilayer bed MFEDI. The results show that both weak acid strong base resin and strong acid strong base resin have good deionization ability, electrical regeneration property and electrical conductivity, which are suitable for the study of high purity water prepared by MFEDI. The weak acid strong base resin is easy to be regenerated after failure. However, the deionization ability and conductivity are not as good as those of strong acid and strong base resin, which can be filled in the influent end of MFEDI to remove most of the ions in water and improve the regeneration effect, and the strong acid strong base resin has excellent deionization ability and electrical conductivity. But the effect of electrical regeneration is poor and can be filled in the effluent end of MFEDI to ensure the effluent quality and improve the conductivity of resin layer. The two-layer bed MFEDI can effectively regenerate the failed ion exchange resin. After several times of electrical regeneration, the resin still has a good treatment effect. The effluent conductivity is 0.056 ~ 0.059 渭 s / cm, which meets the requirements of high purity water quality. The reverse electromigration of ions can be effectively inhibited and the pH value of regenerated solution tends to be neutral. Compared with monolayer MFEDI, the purification efficiency and electrical regeneration performance of MFEDI in double layer bed are significantly improved. The H and OH- ions needed for the electroregeneration of the resin are mainly provided by the water decomposition reaction between the resins and the electrolysis reaction between the electrodes. The former contribution is higher than 80%, the latter contribution is lower than 20%. By using the blocking effect of strong alkali resin layer, multilayer bed MFEDI can effectively inhibit the reverse electromigration of cations and avoid the decrease of electrical conductivity of regenerated solution caused by frequent inversion of MFEDI. High regeneration voltage and electrode damage. High purity water can be prepared by multilayer bed MFEDI for a long time. Within 30 water preparation cycles, the electrical conductivity of the effluent remains between 0.055 ~ 0.060 渭 S / cm, and there is no trend of water quality deterioration. The recovery rate of water is 90%, and the regenerative energy consumption is 0.71 kW 路m ~ (3) 路m ~ (3).
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU991.2;TQ425.23

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