臭氧—活性炭去除饮用水中嗅味物质的研究

发布时间：2018-03-29 18:08

本文选题：O_3-GAC　切入点：嗅味物质　出处：《苏州科技学院》2015年硕士论文

【摘要】：点源污染、面源污染及湖泊局部养殖业废水是造成太湖流域水体富营养化的主要因素。根据对2014年苏州市某水厂原水水质调查结果显示,东太湖主要污染指标为TP、TN、有机污染物,富营养化指数54.4,平均达到II类水体标准。东太湖主要嗅味物质为2-MIB、GSM,6、7、8、9月份是嗅味物质的高发期,其中7月份达到最高值。本文采用中试方法研究了预臭氧-常规工艺与预臭氧-常规工艺-深度处理工艺(O_3-GAC)对含有嗅味物质饮用水的处理效果。通过考察江苏省某自来水厂原水水质,得出4、5月份原水中嗅味物质含量较低,采用投加嗅味物质的方法进行研究,投加量为10ng/L~500ng/L。研究表明:(1)预臭氧-常规工艺对浊度、有机物、氨氮的去除效果较好,但增加深度处理工艺(O_3-GAC)后对低浊度(2NTU)、低浓度有机物(2mg/L)、低浓度氨氮(0.04mg/L)有进一步的去除效果,且出水水质稳定。出水浊度稳定在0.2NTU左右,CODMn稳定在1.20mg/L,氨氮浓度均小于0.02mg/L。(2)原水中嗅味物质投加量为10ng/L~50ng/L时,预臭氧-常规工艺出水中2-MIB、GSM的含量低于国家嗅阈值10ng/L;投加量为80ng/L~500ng/L时,预臭氧-常规工艺出水不能满足出水水质要求。增加深度处理工艺(O_3-GAC)后,原水中嗅味物质200ng/L时,炭滤柱出水检测不出2-MIB、GSM的存在;原水中嗅味物质浓度200ng/L且500ng/L时,炭滤柱出水中2-MIB、GSM的含量均低于1ng/L。(3)预臭氧-常规工艺-深度处理工艺(O_3-GAC)对2-MIB、GSM的去除率稳定,均达到99%左右,试验期间有机物的含量对其影响不明显。但预臭氧-常规工艺对2-MIB的去除率与CODMn去除率呈负相关,R2=0.40938。(4)与生产工艺O_3-BAC工艺相比较,得出生物相对嗅味物质、有机物的去除效果几乎没有影响,但具有稳定O_3-BAC工艺去除低浊度的作用。采用小试方法研究了颗粒活性炭吸附2-MIB的影响因素,研究表明:(1)Freundlich吸附等温线模型比Langmuir吸附等温线模型更适合描述颗粒活性炭对2-MIB的吸附去除过程。(2)由于不同水质中物质含量不同,与2-MIB发生吸附竞争,蒸馏水中GAC吸附容量参数K及吸附速率大于原水和自来水的;自来水中含有余氯,影响GAC吸附容量参数K及吸附速率,使原水中K及吸附速率大于自来水的,且余氯含量越大,影响越明显。(3)在碱性条件下,GAC对2-MIB的吸附效果较好;阳离子Mg2+、AL3+、Fe3+和阴离子NO_3+使GAC对2-MIB的吸附作用下降,影响明显,而Na+、K+、Ca2+、CO_32-、HCO_32-、SO42-对颗粒活性炭吸附去除2-MIB则几乎没有影响。
[Abstract]:Point source pollution, non-point source pollution and lacustrine local aquaculture wastewater are the main factors causing eutrophication in Taihu Lake basin. According to the investigation results of raw water quality of a water plant in Suzhou City in 2014, the main pollution index of East Taihu Lake is TPTNN and organic pollutants. The eutrophication index was 54.4, which reached the standard of Class II water body on average. The main smelling substances in East Taihu Lake were 2-MIBX, GSM6, GSM6, 7, 80.The high incidence of smelling substances was observed in September. In July, the maximum value was reached. In this paper, the effects of pre-ozonation-conventional process and pre-ozonic-conventional process-advanced treatment process on drinking water containing smelling substances were studied by means of pilot-scale method. The raw water quality of a waterworks, The results show that the content of odorous substances in raw water is relatively low in April and May, and the method of adding smelling substances is used to study it. The dosage is 10 ng / L ~ (-1) / L ~ (500) ng / L. the results show that the pre-ozonation / conventional process has better removal effect on turbidity, organic matter and ammonia nitrogen. However, after adding advanced treatment process, O _ 3-GAC) can further remove low turbidity ~ 2NTU, low concentration organic matter ~ 2 mg / L ~ (-1), low concentration ammonia ~ (4) N ~ (2 +) 0.04 mg / L). And the effluent quality is stable, the turbidity of the effluent is stable at 1.20 mg / L of 0.2NTU, and the concentration of ammonia nitrogen is less than 0.02 mg / L ~ (2). When the amount of smelling substance in raw water is 10ng/L~50ng/L, the content of 2-MIBN in pre-ozonation and conventional process effluent is lower than the national olfactory threshold of 10 ng / L, and when the dosage is 80ng/L~500ng/L, Pre-ozonation-conventional process effluent can not meet the requirement of effluent quality. After adding the advanced treatment process, the presence of 2-MIBM-GSM in raw water can not be detected when the smell substance 200ng/L in raw water is added, and when the concentration of odorous substance in raw water is 200ng/L and 500ng/L, The content of 2-MIBN GSM in the effluent of carbon filter column is lower than that of 1ng / L 路L ~ (-3)). The removal rate of 2-MIBN GSM by pre-ozonation-conventional process-advanced treatment process (O _ (3-GAC)) is stable, reaching about 99%. However, the removal rate of 2-MIB by pre-ozonation-conventional process was negatively correlated with the removal rate of CODMn. The removal efficiency of organic matter has little effect, but it has the effect of stabilizing the removal of low turbidity by O_3-BAC process. The factors affecting the adsorption of 2-MIB by granular activated carbon were studied by small scale experiment. The results show that the Langmuir adsorption isotherm model is more suitable than the Langmuir adsorption isotherm model to describe the adsorption and removal process of 2-MIB by granular activated carbon. The adsorption capacity parameter K and adsorption rate of GAC in distilled water are larger than those in raw water and tap water, and the residual chlorine content in tap water is higher than that in tap water, which affects the adsorption capacity parameter K and adsorption rate of GAC in raw water, and the adsorption rate of K and adsorption rate in raw water is larger than that in tap water, and the content of residual chlorine in tap water is higher. The more obvious the effect is, the better the adsorption effect of GAC on 2-MIB is under alkaline condition, the effect of cation Mg2 AL3Fe3 and anionic NO_3 on the adsorption of 2-MIB is decreased, and the effect of GAC on the adsorption of 2-MIB is obvious, while the adsorption of 2-MIB on granular activated carbon is almost unaffected by Na ~ (2 +) K ~ (2 +) Ca ~ (2 +) ~ (2) -CO32 ~ (-) -C _ (32) so _ (4) ~ (-) -.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU991.2

【参考文献】