摘要
应用Ferron逐时络合比色法，从铝形态分布及其转化的角度，研究了臭氧对聚合氯化铝混凝性能影响并探究其原因。结果表明，预臭氧对聚合氯化铝（PAC）的混凝效果有显著影响。在一定质量浓度范围内（0～3．60mg／L），臭氧浓度越高，水样浊度越高（其UV254（即254nm波长下水样的紫外吸光度值，表征含芳香环结构和共轭双键结构的有机物含量）和溶解性有机碳（DOC）的去除效果较显著）。臭氧对混凝剂水解形态有显著影响。预臭氧后，混凝絮体形成和浊度的去除与铝混凝剂中中等聚合态铝（Alb）的含量有关，Alb的含量越高，浊度去除效果越好。因此，臭氧剂量的增加抑制Alb生成可能是导致浊度升高的一个重要原因。
The Ferron timed complex-colorimetric method was applied to investigate the influence of pre-ozona- ：ion on coagulation property of polyaluminium chloride （PAC） as well as to explore the reasons from the perspective of speciation conversion of aluminum. The study results showed that pre-ozonation had a notable influence on coagula- tion effects of PAC. In a specific range of 0-3.60 mg/L,the higher the ozone concentration,the higher the turbidity of settled water,the removal effects of UV254 （the UV absorbance values of water samples at 254 nm ,which characteri- zes the organic matter content containing aromatic ring structure and conjugated double bond structure）and dissolved organic carbon （DOC） were remarkable. Pre-ozonation had a notable influence on species distribution of coagulant. The removal of turbidity and the formation of flocs related to the polymerized A1 （Alb） of PAC,the more Alb quantity, the more turbidity removed. Therefore, the increase in ozone dose suppression Alb generation may be one important reason of the worse coagulation effect.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2014年第7期27-30,共4页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.51179099)
山西省科技攻关项目(No.20110321021-01)
关键词
预臭氧
聚合氯化铝(PAC)
混凝性能
形态分布
pre-ozonation
polyaluminium chloride
coagulation property
species distribution
