微生物电化学耦合系统降解2,4,6-TCP的特性研究

发布时间：2019-03-11 19:24

【摘要】：随着医药、造纸等行业的快速发展,氯酚类物质被不断地生产,此类物质会不可避免地进入水体环境中。氯酚类物质有毒性且具有“三致”效应,而且在水体中很难通过水体自净作用降解,因此对地球生态环境造成了严重威胁,也引起了广大研究者的关注。传统单纯的物理法、化学法和生物法存在二次污染、针对性不强等缺点,因此建立一种新颖有效的方法来处理此类难降解有机废水具有重要意义。本文采用生物电化学系统(BES)中的微生物电解池(MEC)来处理2,4,6-三氯酚(2,4,6-TCP)模拟废水,废水先经生物阴极还原,再将还原一段时间后的阴极液移至生物阳极氧化降解。本文旨在寻求一种处理氯酚废水的新方法。主要成果如下:(1)成功制备了能够还原降解2,4,6-TCP的生物阴极和具有氧化2,4,6-TCP及其中间产物的生物阳极,微生物电化学系统被成功启动。(2)通过正交实验,确定了影响2,4,6-TCP降解的几个因素的主次,结果为:外加电压初始pH2,4,6-TCP初始浓度阴极初始葡萄糖浓度。(3)通过单因素实验,更深入优化实验条件,发现当外加电压为0.7V,初始pH=7.0,2,4,6-TCP初始浓度为20mg/L时,降解72h,2,4,6-TCP降解率达到100%。(4)通过对比电化学法、厌氧生物法和电化学耦合微生物法发现,电化学耦合微生物法降解2,4,6-TCP的效果明显好于单纯的电化学法或单纯的厌氧生物法。(5)对降解后的废水进行HPLC和HPLC/MS测定,发现2,4,6-TCP的降解途径主要是首先在阴极还原作用下进行还原脱氯,脱氯后的阴极液转移至阳极后,在氧化作用下生成多元酚,进一步降低了苯环开环所学的化学能,继续在阳极氧化作用下生成小分子酸,最终部分被矿化成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.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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