离子交换树脂去除原水中锑的研究

发布时间：2018-01-05 07:03

本文关键词：离子交换树脂去除原水中锑的研究　出处：《昆明理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：锑是一种重金属元素,具有慢性毒性和潜在致癌性,是一种全球性环境污染物质。天然淡水中锑的浓度小于1μg/L,但是采矿区的水体中锑的含量可达数百乃至数千u g/L。水环境中,锑主要以三价(Sb(Ⅲ))和五价(Sb(V))两种价态存在。本文针对部分水资源含锑量较高的情况,采用离子交换法对其进行处理,使之达到国家规定的饮用水质标准,为解决原水中锑超标的问题找到一种行之有效的方法。本课题采用D401螯合交换树脂对受锑污染的原水进行修复,为工程实践中应用该方法修复锑污染水体提供借鉴和参考。本文研究的主要内容有：(1)离子交换树脂的筛选,从D001、D201、D401中筛选出对锑去除率最高即吸附容量最大的离子交换树脂；(2)选用D401螯合交换树脂,通过静态试验,研究树脂用量、原水pH值、原水温度、振荡时间等因素对锑的去除率的影响；(3)选用D401螯合交换树脂,通过动态试验,测定D401螯合交换树脂除锑的穿透曲线；(4)通过吸附等温试验,研究D401螯合交换树脂除锑的吸附模型,对树脂除锑的机理进行分析研究；(5)D401螯合交换树脂的再生试验研究,并对树脂的再生原理进行初步探讨。研究结果表明,D401螯合交换树脂最佳试验条件为树脂用量4.00g(水样为150mL),原水pH值在7.0左右,原水温度在室温20℃下,振荡1小时以上,锑的去除率能达到95%以上。试验得出除锑吸附等温线所属的类型,D401螯合交换树脂对水中的锑吸附符合Freundlich吸附模型。采用准二级吸附动力学方程来描述D401螯合树脂对锑的吸附动力学过程。颗粒扩散为反应控制步骤,研究结果表明：颗粒扩散控制相关性为最佳。对盐酸和氢氧化钠两种再生溶液比较和氢氧化钠浓度不同的比较,得出用4%的氢氧化钠溶液进行树脂再生效果最合适,树脂再生后交换能力可以得到恢复。离子交换法去除原水中锑具有方法操作简便、实用性强、去除效率高等特点。因此,用离子交换法去除原水中锑是有效的和可行的。
[Abstract]:Antimony is a heavy metal element with chronic toxicity and potential carcinogenicity, is a global environmental pollutant. The concentration of antimony in natural water is less than 1 g/L, but the content can reach the mining area of antimony in water of hundreds or thousands of u g/L. in the water environment, mainly trivalent antimony (Sb (III) and pentavalent) (Sb (V)) has two valence.
This paper deals with the water resource antimony content high, ion exchange method was used to process, to meet the requirement of national drinking water quality standards, in order to solve the problem of antimony in raw water exceed the standard to find an effective method. This paper uses D401 chelating exchange resin to repair the antimony polluted raw water, provide a reference and the reference for the application of this method to repair antimony polluted water engineering practice.
The main contents of this paper are: (1) screening, ion exchange resin from D001, D201, selected the highest removal rate of antimony ion adsorption capacity is the largest exchange resin in D401; (2) using D401 chelating exchange resins by static test of resin dosage, pH value of raw water, water temperature, oscillation time and other factors affecting the removal of antimony; (3) using D401 chelating exchange resins by the dynamic test, the determination of the exchange resin in addition to breakthrough curve of antimony D401 chelate; (4) through the isothermal adsorption experiment, D401 chelating exchange resin in adsorption model of antimony, antimony removal mechanism of resin were studied; (5) experimental study on regeneration of D401 chelating exchange resins, and the regenerative principle of resin were discussed.
The results show that the optimal experimental conditions of D401 chelating resin exchange resin 4.00g (150mL water), pH value of raw water in about 7, the water temperature at room temperature under 20 DEG C, the oscillation of 1 hours or more, the antimony removal rate can reach more than 95%. In addition to test that type of antimony adsorption isotherm of the D401 chelate exchange antimony adsorption resin in water with Freundlich adsorption model. The two adsorption kinetic equation to describe the adsorption kinetics of D401 chelating resin for antimony. The particle diffusion is the controlling step of reaction, the results show that the particle diffusion control correlation is the best. To compare different regeneration solution and sodium hydroxide concentration of two hydrochloric acid and sodium hydroxide. Come with 4% sodium hydroxide solution regeneration effect most suitable resin exchange capacity, resin regeneration can be restored. After the removal of antimony with ion exchange method The method is simple, practical and efficient. Therefore, it is effective and feasible to remove antimony in the raw water by ion exchange.

【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.2

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