高铁酸盐预氧化对松花江水混凝效果的影响  

Effect of Ferrate Preoxidation on Coagulation of Songhua River

作　　者：李春娟[1] 马军[1] 梁涛[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090

出　　处：《环境科学》2008年第6期1550-1554,共5页Environmental Science

基　　金：教育部科技创新重大项目培育基金项目(705013)

摘　　要：以高铁酸钾和硫酸铝为预氧化剂和混凝剂,考察了NH4+-N、浊度、TOC、AOC和相对分子质量分布(Mr)等参数的变化,分析了高铁酸钾预氧化对松花江水源水性质产生的影响.结果表明,单独硫酸铝混凝时,在混凝剂投量为50 mg.L-1的条件下,松花江水的UV254、浊度、TOC的去除率分别为36.7%、80.2%3、1.1%.当高铁酸钾为预氧化剂,投量为1 mg.L-1时,混凝后松花江水的UV254、浊度、TOC的去除率分别为63.3%、89.6%3、7.0%.高铁酸盐预氧化使混凝后的NH4+-N值上升了17%.高铁酸盐预氧化使松花江水混凝后的AOC值从998μg.L-1升到1 241μg.L-1,同时,使混凝后的AOC/TOC从28.4%上升到38.7%,很大程度上提高了原水中有机物的可生物降解性.这一过程中,AOC-P17所代表的醛酮类物质显著增加,达到总AOC的83%.溶解态有机物分子量分布的考察表明,Mr小于500的分子所占的百分比由单独混凝时的38.9%上升到预氧化后的65.0%,证明高铁酸钾预氧化将原水中的大分子有机物氧化成小分子有机物.小分子有机物的增加引起了原水可生物降解性的提高.The preoxidation of polluted surface water with ferrate was conducted with respect to its impact on the following coagulation.It can be seen that UV（254）-absorbance,turbidity and TOC substantially decreased by 36.7%,80.2%,31.1%, respectively,after coagulation,without ferrate preoxidation,and by 63.3%,89.6%,37.0%,respectively,after coagulation,with ferrate preoxidation.It is noted that NH^＋4-N concentration is increased by 17% after coagulation with ferrate.This phenomenon can be explained by the fact that organics containing nitrogen in raw water were partly oxidized to inorganic nitrogen by ferrate preoxidation.After coagulation,AOC and AOC/TOC are increased from 998μg·L^-1 to 1241 μg·L^-1,from 28.4% to 38.7%,respectively,by ferrate preoxidation.AOC-P17/AOC after coagulation is up to 83% with ferrate preoxidation.These suggest that preoxidation with ferrate promoted the biodegradation of organics with substantial increases of AOC,AOC/TOC.The results indicate that the concentration of organics with relative molecular mass（Mr） of 10000-100000 and less than 500 were substantially increased after the raw water was coagulated with ferrate preoxidation,which suggested that some high molecular weight organic substances were broken into smaller ones during ferrate preoxidation.After coagulation,organics of less than Mr=500 in TOC are increased up to 65.0% with preoxidation from 38.9% without ferrate preoxidation.These oxidation products are biodegradable.

关 键 词：高铁酸盐 预氧化 生物降解性 AOC 分子量 

分 类 号：X522[环境科学与工程—环境工程]