【摘要】：隨著醫(yī)藥、造紙等行業(yè)的快速發(fā)展,氯酚類物質(zhì)被不斷地生產(chǎn),此類物質(zhì)會不可避免地進(jìn)入水體環(huán)境中。氯酚類物質(zhì)有毒性且具有“三致”效應(yīng),而且在水體中很難通過水體自凈作用降解,因此對地球生態(tài)環(huán)境造成了嚴(yán)重威脅,也引起了廣大研究者的關(guān)注。傳統(tǒng)單純的物理法、化學(xué)法和生物法存在二次污染、針對性不強(qiáng)等缺點(diǎn),因此建立一種新穎有效的方法來處理此類難降解有機(jī)廢水具有重要意義。本文采用生物電化學(xué)系統(tǒng)(BES)中的微生物電解池(MEC)來處理2,4,6-三氯酚(2,4,6-TCP)模擬廢水,廢水先經(jīng)生物陰極還原,再將還原一段時間后的陰極液移至生物陽極氧化降解。本文旨在尋求一種處理氯酚廢水的新方法。主要成果如下:(1)成功制備了能夠還原降解2,4,6-TCP的生物陰極和具有氧化2,4,6-TCP及其中間產(chǎn)物的生物陽極,微生物電化學(xué)系統(tǒng)被成功啟動。(2)通過正交實驗,確定了影響2,4,6-TCP降解的幾個因素的主次,結(jié)果為:外加電壓初始pH2,4,6-TCP初始濃度陰極初始葡萄糖濃度。(3)通過單因素實驗,更深入優(yōu)化實驗條件,發(fā)現(xiàn)當(dāng)外加電壓為0.7V,初始pH=7.0,2,4,6-TCP初始濃度為20mg/L時,降解72h,2,4,6-TCP降解率達(dá)到100%。(4)通過對比電化學(xué)法、厭氧生物法和電化學(xué)耦合微生物法發(fā)現(xiàn),電化學(xué)耦合微生物法降解2,4,6-TCP的效果明顯好于單純的電化學(xué)法或單純的厭氧生物法。(5)對降解后的廢水進(jìn)行HPLC和HPLC/MS測定,發(fā)現(xiàn)2,4,6-TCP的降解途徑主要是首先在陰極還原作用下進(jìn)行還原脫氯,脫氯后的陰極液轉(zhuǎn)移至陽極后,在氧化作用下生成多元酚,進(jìn)一步降低了苯環(huán)開環(huán)所學(xué)的化學(xué)能,繼續(xù)在陽極氧化作用下生成小分子酸,最終部分被礦化成CO2和H2O。
[Abstract]:With the rapid development of pharmaceutical, papermaking and other industries, chlorophenols are produced continuously, and this kind of substances will inevitably enter the water environment. Chlorophenols are toxic and have the effect of "three causes", and it is very difficult to degrade by self-purification of water body in water. Therefore, chlorophenols pose a serious threat to the ecological environment of the earth and have aroused the attention of many researchers. The traditional physical, chemical and biological methods have some disadvantages, such as secondary pollution and poor pertinence. Therefore, it is of great significance to establish a novel and effective method for the treatment of this kind of refractory organic wastewater. In this paper, 2,4,6-trichlorophenol (2,4,6-trichlorophenol) simulated wastewater was treated by microbiological electrolysis cell (MEC) in bioelectrochemical system (BES), and the wastewater was first reduced by bio-cathode. Then the cathodic solution after reduction for a period of time was moved to bioanodizing degradation. The aim of this paper is to find a new method to treat chlorophenol wastewater. The main results are as follows: (1) the bio-cathodes which can reduce the degradation of 2,4,6 TCP and the bio-anodes with 2,4,6-TCP and its intermediate products were successfully prepared, and the microbial electrochemical system was successfully activated. (2) the orthogonal experiment was carried out. The primary and secondary factors affecting the degradation of 2,4 and 6 are determined. The results are as follows: initial concentration of pH2,4,6-TCP at applied voltage initial concentration of glucose in cathode. (3) through single factor experiment, the experimental conditions are further optimized. It was found that when the applied voltage was 0.7 V and the initial concentration of pH=7.0,2,4,6-TCP was 20mg/L, the degradation rate reached 100% for 72 h, 2,4, and 6 h respectively. (4) the degradation rate was 100% by contrast electrochemical method. Anaerobic biological method and electrochemical coupled microbial method found that the electrochemical coupled microbial method degraded 2,4, The effect of 6-TCP is obviously better than that of simple electrochemical method or anaerobic biological method. (5) the HPLC and HPLC/MS of the degraded wastewater were determined, and the results showed that 2,4,4, The degradation of 6-TCP is mainly carried out by reducing dechlorination under cathodic reduction. The cathodic solution after dechlorination is transferred to the anode and then polyphenol is formed under oxidation, which further reduces the chemical energy of benzene ring opening. Small molecular acids continue to be formed by anodizing, and the final part is mineralized to CO2 and H2O.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703

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