饮用水中二氧化氯无机副产物的产生及控制方法研究

发布时间：2018-03-25 01:18

本文选题：二氧化氯　切入点：发生器　出处：《哈尔滨工业大学》2013年硕士论文

【摘要】：作为第四代饮用水消毒剂，二氧化氯具有高效、广谱、与水中有机物反应不生成有机氯代物的特点。近年来，许多水厂开始使用二氧化氯作为水处理剂，整体使用效果良好。但是，二氧化氯无机副产物易超标的问题普遍存在，目前尚无有效的解决方案，阻碍了二氧化氯作为新一代饮用水消毒剂的推广和发展。在查阅相关文献以及实地调研的基础上，本论文以二氧化氯无机副产物的三个来源，二氧化氯自身分解过程、发生器产生二氧化氯过程以及二氧化氯与水体作用过程为研究思路。研究了二氧化氯自身分解过程中无机副产物的产生规律，分析了温度、初始浓度、光照、pH对二氧化氯衰减速率及副产物生成规律的影响，结果表明二氧化氯自身分解对无机副产物的产生量影响较小，影响二氧化氯自身分速率的因素中光照强度pH温度初始浓度，闭光是减缓二氧化氯自身分解的最有效措施。研究了两种不同原理二氧化氯发生器产生二氧化氯无机副产物的规律，分析发生器运行条件对二氧化氯收率、二氧化氯纯度、氯酸盐产生量的影响，，结果表明，R11法发生器本身对氯酸盐和亚氯酸盐的产生量无影响；R5法发生器在盐酸与氯酸钠体积比为1:1.2，反应温度65℃的条件下运行，可以有效降低氯酸盐的产生量；R5法发生器增加母液循环母液装置后，氯酸盐产生量降低了25%；增加气液分离装置后可以从根本上解决R5法发生器产生氯酸盐的弊端。研究了二氧化氯溶液用于原水预处理过程中无机副产物的产生规律，结果表明，混合二氧化氯用于原水预处理，氯气的存在会促进水体中的亚氯酸盐转化为氯酸盐，可以通过增大二氧化氯纯度减少氯酸盐的产生量。纯二氧化氯用于原水预处理，副产物产生量取决于二氧化氯投加量，受其他因素影响较小。当ClO2投加量为0~1.0mg/L时，亚氯酸盐生成量为ClO2投加量的0.7倍，当ClO2投加量为1.0~3.0mg/L时，亚氯酸盐生成量为ClO2投加量的0.5倍，当ClO2投加量为3.0mg/L~5.0mg/L时，亚氯酸盐生成量为ClO2投加量的0.4倍。纯二氧化氯预氧化除锰时，ClO2和混凝剂投加间隔在10min内为宜，投加量为原水锰含量的3倍左右；除藻时，投加点宜选在混凝剂投加点之后，投加量在1mg/L以内。
[Abstract]:As the fourth generation of drinking water disinfectant, chlorine dioxide has the advantages of high efficiency, broad spectrum, characteristic reaction and organic matter in the water does not produce chlorinated organic compounds. In recent years, many waterworks started using chlorine dioxide as a water treatment agent, the use effect is good. However, widespread chlorine dioxide inorganic by-products to exceed the standard problem, there is no effective solution that hindered the promotion and development of chlorine dioxide as a new generation of drinking water disinfectant.
On the basis of consulting relevant literature and field research, this paper takes three sources of chlorine dioxide by-products, decomposition process of chlorine dioxide, generator chlorine dioxide generation process and chlorine dioxide interaction with water as the research train of thought.
Study on the regularity of inorganic chlorine dioxide itself in the process of decomposition byproducts, analysis of temperature, initial concentration, light, the effect of pH on the formation and decay of chlorine dioxide by-product reduction rate. The results show that the decomposition of chlorine dioxide inorganic by-products was less affected, factors affecting the rate of chlorine dioxide itself in light intensity pH temperature initial concentration, light is the most effective measures to slow closing its chlorine dioxide decomposition.
Study two different principle of chlorine dioxide generator to produce chlorine dioxide inorganic by-products of purity analysis of chlorine dioxide generator operating conditions on the yield, production of chlorine dioxide, the effects of chlorate results show that R11 has no effect by itself on the generator of chlorate and chlorite produced; R5 generator in hydrochloric acid and sodium chlorate volume ratio for 1:1.2, the reaction temperature is 65 DEG C under the condition of operation, can effectively reduce the production of chlorate; R5 generator device for increasing mother liquor circulation liquor, chlorate production decreased by 25%; increase the drawbacks of gas liquid separation device can fundamentally solve the R5 generator to produce chlorate.
Study of chlorine dioxide solution for generating rules, inorganic raw water pretreatment process of by-products. The results show that the mixing of chlorine dioxide for raw water pretreatment, the presence of chlorine will promote chlorite in water into chlorate, can increase the purity of chlorine dioxide produced less reduction of chlorate. Pure chlorine dioxide for raw water pretreatment, vice the product produced depends on the amount of chlorine dioxide dosage and other factors is small. When the ClO2 dosage is 0~1.0mg/L, chlorite formation was 0.7 times of the dosage of ClO2, when the dosage of ClO2 was 1.0~3.0mg/ L, chlorite formation was 0.5 times of the dosage of ClO2, when the dosage of ClO2 was 3.0mg/L~5.0mg/L, chlorite formation was 0.4 times of the dosage of ClO2. The pure chlorine dioxide pre oxidation of manganese, ClO2 and coagulant dosing interval should be within 10min, the dosage was 3 times the left raw water manganese content Right; when algae removal, the dosing point should be selected after the coagulant dosing point, and the dosage is within 1mg/L.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU991.2

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