【作者】 丘贝；

【导师】 许仕荣；

【作者基本信息】 湖南大学 ， 市政工程， 2006， 硕士

【摘要】 通过静态批量试验方法,以柳江原水为研究对象,选择高锰酸钾、过氧化氢、臭氧、二氧化氯和氯五种氧化剂,全面考察了化学预氧化对混凝效果的影响。试验中先投加氧化剂,再投加混凝剂,充分沉淀后,检测出水浊度、TOC和UV254,通过这些指标变化来评价预氧化对混凝效果的影响。试验重点研究了预氧化剂的种类、投量和预氧化时间对聚合氯化铝和硫酸铝两种混凝剂混凝效果的影响;同时分析了pH值和温度因素对化学预氧化工艺的影响;探讨了化学预氧化影响混凝工艺的机理。试验结果表明:尽管使用的混凝剂本身的处理效果有差别,但各种氧化剂对混凝效果都有不同程度的促进作用。在所采用的五种氧化剂中,高锰酸钾对混凝效果的促进作用最有效,过氧化氢次之,臭氧的效果最差;氧化剂的投量和预氧化时间对混凝效果也有很大的影响:在水体中投加适量的氧化剂,并保证一定反应的时间,才可以达到对混凝的最佳促进作用;过量混凝剂的投量导致胶体重新稳定,化学预氧化对混凝的促进作用就无法体现;pH和温度的变化对化学药剂没有明显的阻碍作用,因此不会影响化学预氧化对混凝效果的促进作用。此外,TOC的去除率随着浊度去除率的提高而增加,但UV254去除效果的提高和浊度的去除效果没有必然的联系。更多还原

【Abstract】 By using batch static test, the effect of chemistry pre-oxidation on coagulation were researched. The raw water come from liujiang river. Oxidants evaluated included potassium permanganate(KMnO4), hydrogen peroxide(H 2 O 2 ), ozone(O 3 ), chlorine dioxide(ClO 2 ), and chlorine(Cl2). Effect of pre-oxidation on alum coagulation evaluated through the change of turbidity、TOC and UV254. The emphasis on some impact factors such as the kind or variety of oxidant and oxidant contact time were studied, with discussing the influence of pH and solution temperature. At the same time, theory of effect on pre-oxidation was analyzed.The experiment show that various oxidants had positive impacts of different degree on alum coagulation. Potassium permanganate(KMnO4) was found to be the most effective oxidant of the six investigated. Then the hydrogen peroxide(H 2 O 2 ). ozone(O3) was the most ineffective for increased the removal rate of turbidity、TOC and UV254 after alum coagulation. The most positive effect on alum coagulation must throw in the oxidant properly and enough contact time. Effect on pre-oxidation followed by alum coagulation can not be studied when the dosage of coagulation was excessive. The pH and Solution temperature had little effect on removal turbidity、TOC and UV254 by alum coagulation after pre-oxidation. Effect on removal of TOC was arised along with increase the removal rate of turbidity, but there isn’t relation between UV254 and turbidity.更多还原