联用消毒剂在不同管材中对水质的影响研究

发布时间：2018-07-04 10:39

本文选题：联用消毒剂 + 饮用水　；参考：《湖南大学》2015年硕士论文

【摘要】：消毒是保证饮用水质量安全的重要环节,传统的氯消毒操作简便,成本低廉,但其消毒过程中产生的消毒副产物降低了饮用水安全性,联用消毒剂可以发挥单个消毒剂的优点,减少其缺点,有良好的应用前景。本试验选用二氧化氯和氯、二氧化氯和氯胺、氯和氯胺三种联用消毒剂,球墨铸铁管和PE管两种常用管材,研究联用消毒剂在不同管材中对水质的影响。试验所用原水为长沙市某水厂砂滤后水,在原水中定量投加消毒剂后,加入各管材的动态管和静态管分别进行动态模拟试验和静态浸泡试验,在试验开始的1h、6h、12h、24h定时取样,同时做主体水试验(即烧杯试验)作为对比。试验结果表明:(1)联用消毒剂中各消毒剂的衰减速率比单独使用时低,不同管材水体中消耗消毒剂的物质含量和水力条件不同,对消毒剂衰减的影响也不同,消毒剂衰减速率由大到小依次为:球墨铸铁管PE管主体水,同种管材中,动态静态。(2)联用消毒剂在控制消毒副产物方面优于单独消毒剂,以二氧化氯为主消毒剂的联用消毒剂可有效控制CHCl_3的产生,同时减少无机消毒副产物ClO_2~-和ClO_3~-的产生量,氯和氯胺联用消毒时产生的CHCl_3小于单独氯消毒,管材的影响会使水中生成的消毒副产物增多,由高到低排序为:球墨铸铁管PE管主体水,动态管静态管。(3)管网水的TOC都随时间增长,主体水中TOC基本不变,同种管材中,动态管中TOC高于静态管,且水中二氧化氯浓度越高,TOC含量越高,主要原因是二氧化氯对管壁的溶蚀作用较强,使水中TOC升高。(4)pH的变化主要和水中所含的氯和氯胺有关,单独二氧化氯消毒时水中p H基本不变;浊度和铁含量的主要影响因素为水力冲刷作用;球墨铸铁管中溶解氧较原水有所下降,PE管和主体水无明显变化。
[Abstract]:Disinfection is an important link to ensure the quality and safety of drinking water. The traditional chlorine disinfection is simple and inexpensive, but the disinfection by-products produced in the disinfection process reduce the safety of drinking water, and the combined use of disinfectants can play the advantages of single disinfectant. To reduce its shortcomings, it has a good application prospect. Two kinds of commonly used disinfectants, chlorine dioxide and chlorine dioxide, chlorine dioxide and chloramine, chlorine and chloramine, ductile iron pipe and PE tube, were used in this experiment to study the effect of combined disinfectant on water quality in different pipes. The raw water used in the test is sand filtered water from a water plant in Changsha. After the quantitative addition of disinfectant to the raw water, the dynamic simulation test and static immersion test of the dynamic and static tubes of each pipe are carried out, respectively, and the samples are sampled regularly at 1h, 6h, 12h, 12h, 24h, respectively. At the same time, the main water test (beaker test) as a comparison. The results showed that: (1) the decay rate of each disinfectant in the combined disinfectant was lower than that in the single disinfectant, and the content of the disinfectant and the hydraulic conditions of the disinfectant were different in the water of different pipes, and the effect on the attenuation of the disinfectant was also different. The decay rate of disinfectant is as follows: ductile iron pipe PE pipe main body water, in the same kind of pipe, dynamic and static. (2) the combined disinfectant is superior to the single disinfectant in controlling disinfection by-products. The combined disinfectant with chlorine dioxide as the main disinfectant can effectively control the production of CHClS3, and at the same time reduce the production of the inorganic disinfection by-products ClO2- and ClO3-, and the CHCl3 produced by the combined disinfection of chlorine and chloramine is lower than that produced by the disinfection of chlorine alone. The influence of pipe material will increase the disinfection by-products in water. The order from high to low is: ductile iron pipe PE pipe main water, dynamic pipe static pipe. (3) the TOC of pipe water increases with time, the main body water TOC is basically unchanged, in the same kind of pipe material, The TOC in the dynamic tube is higher than that in the static tube, and the higher the concentration of chlorine dioxide in the water is, the higher the content of TOC is. The main reason is that the dissolution of chlorine dioxide on the tube wall is stronger, which makes the TOC in the water increase. (4) the change of pH is mainly related to the chlorine and chloramine in the water. Water pH was basically unchanged when chlorine dioxide was disinfected alone, the main factors affecting turbidity and iron content were hydraulic scour, and the dissolved oxygen in ductile iron pipe was lower than that in raw water, and there was no obvious change in PE pipe and main body water.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU991.2

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