饮用水嗅味控制技术研究

发布时间：2018-03-21 07:26

本文选题：致嗅物质　切入点：氧化　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：为解决C市汛期存在的饮用水嗅味问题,通过现场调查分析了S水库主要的致嗅物质及其浓度,以及A水厂常规处理工艺对致嗅物质的去除效果;针对原水中主要的致嗅物质,分别研究了氧化、吸附、曝气及联用工艺对致嗅物质的去除性能,建立了氧化、吸附、曝气去除致嗅物质的动力学模型,预测了不同工艺去除致嗅物质的效果;通过技术经济分析,筛选了适宜的嗅味控制技术。主要研究成果如下:(1)本次现场调查期间,S水库原水中主要致嗅物质是二甲基异茨醇(2-MIB),其浓度分别为7.06-136.32 ng/L;其次是土臭素(GSM),其浓度范围为0-93.98 ng/L;2-MIB和GSM在库内的空间分布很不均匀,主要存在于坝前主库区的表层水域;A水厂常规处理工艺基本不能去除致嗅物质。(3)GSM和2-MIB的去除率随高锰酸钾投加量的增加和氧化时间的延长而逐渐增大;在原水致嗅物质浓度50~200ng/L的条件下,高锰酸钾氧化(伴以搅拌)对致嗅物质的去除率分别约为80~100%左右,其中高锰酸钾氧化对致嗅物质的实际去除率约为20%左右,且高锰酸钾对GSM的氧化去除效果略优于2-MIB,且受原水水质影响。(4)GSM和2-MIB的去除率随二氧化氯投加量的增加而增大,二氧化氯氧化去除GSM的效果略优于2-MIB;相对高锰酸钾而言,在其他条件相同的情况下,二氧化氯氧化去除致嗅物质的效果更好。(5)在GSM和2-MIB浓度一定的条件下,粉末活性炭吸附对致嗅物质的吸附速率和去除率随粉末活性炭投加量的增加而增大;同等条件下,粉末活性炭吸附2-MIB的效果差于GSM,且受原水水质影响较大。(6)曝气吹脱对GSM的去除效果优于2-MIB;曝气吹脱对致嗅物质的去除率随气水比增加而增大,与致嗅物质初始浓度无关;确定了对应不同气水比的原水致嗅物质的上限浓度。(7)建立了高锰酸钾氧化、粉末活性炭吸附、曝气吹脱去除致嗅物质的动力学模型,运用所建的相关动力学模型,准确预测了不同工艺去除致嗅物质的效果,确定了适宜的工艺参数。(8)针对对高锰酸钾氧化、二氧化氯氧化、粉末活性炭吸附、曝气吹脱等4种单元工艺和高锰酸钾氧化-粉末活性炭吸附联用、曝气吹脱-粉末活性炭吸附联用等2种联用工艺,进行了技术经济比较;在原水GSM或2-MIB浓度较低时,推荐采用高锰酸钾氧化或二氧化氯氧化;在原水GSM或2-MIB浓度较高时,首先推荐采用高锰酸钾氧化工艺,其次推荐高锰酸钾氧化-粉末活性炭吸附联用工艺,如果供气成本低廉,也可采用曝气吹脱-粉末活性炭吸附联用工艺;不同原水水质条件下的适宜工艺参数可应用相关动力学模型加以确定,但模型参数需要适当调整。
[Abstract]:In order to solve the problem of sniffing in drinking water in flood season in C City, the main odorous substances and their concentrations in Reservoir S were investigated and analyzed, as well as the removal effect of the main odorous substances in the raw water by the conventional treatment process of A Waterworks, and the main odorous substances in the raw water were analyzed. The effects of oxidation, adsorption, aeration and combined process on the removal of olfactory substances were studied. The kinetic models of oxidation, adsorption and aeration were established, and the effects of different processes on the removal of olfactory substances were predicted. Through technical and economic analysis, The main results of this study are as follows: 1) during the field investigation, the main odorous substance in the raw water of the reservoir was dimethyl isoctadol 2-MIBN, the concentrations of which were 7.06-136.32 ng / L respectively, and the next was GSMN, whose concentration was in the range of 7.06-136.32 ng / L, respectively. The spatial distribution of 0-93.98 ng / L ~ (2-MIB) and GSM in the reservoir is very uneven. The removal rate of GSM and 2-MIB can not be removed basically by the conventional treatment process of the surface water plant in the main reservoir area in front of the dam with the increase of potassium permanganate dosage and the prolongation of oxidation time. Under the condition of 50 ~ 200ng / L olfactory substance concentration in raw water, the removal rate of olfactory substance by potassium permanganate oxidation (accompanied by stirring) is about 80 ~ 100%, and the actual removal rate of olfactory substance by potassium permanganate oxidation is about 20%. The removal efficiency of potassium permanganate on GSM was slightly better than that of 2-MIB, and the removal rates of GSM and 2-MIB increased with the increase of chlorine dioxide dosage, compared with potassium permanganate, compared with potassium permanganate, the removal rate of KMnO _ 2 and 2-MIB increased with the increase of the amount of chlorine dioxide, compared with potassium permanganate, the removal efficiency of KMnO _ 2 was better than that of 2-MIB. Under the same conditions, chlorine dioxide oxidation is more effective in removing odorous substances. 5) under certain concentrations of GSM and 2-MIB, The adsorption rate and removal rate of odorous substances by powder activated carbon increased with the increase of the dosage of powder activated carbon. The adsorption effect of 2-MIB on powdered activated carbon was worse than that of GSM, and the removal efficiency of GSM by aeration blowing was better than that of 2-MIB.The removal rate of odorous substance increased with the increase of air-water ratio, and was not related to the initial concentration of odorous substance. The upper limit concentration of olfactory substance in raw water corresponding to different air-water ratio was determined. The kinetic model of potassium permanganate oxidation, powder activated carbon adsorption and aeration desorption was established. The effects of different processes on the removal of odorous substances were accurately predicted, and the appropriate technological parameters were determined. For potassium permanganate oxidation, chlorine dioxide oxidation, powder activated carbon adsorption, The technical and economic comparison was made between the four unit processes of aeration and potassium permanganate oxidation-powder activated carbon adsorption, aeration blowing and powder activated carbon adsorption, when the concentration of GSM or 2-MIB in raw water was lower, Potassium permanganate oxidation or chlorine dioxide oxidation is recommended. When the concentration of GSM or 2-MIB in raw water is high, the process of potassium permanganate oxidation is first recommended, and the combined process of potassium permanganate oxidation and powdered activated carbon adsorption is recommended, if the gas supply cost is low, The appropriate process parameters under different raw water quality conditions can be determined by the relevant kinetic model, but the model parameters need to be adjusted appropriately.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU991.2

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