pH值对海水混凝处理过程中絮凝效能的影响  

Impact of pH Value on Flocculation Efficiency in the Process of Seawater Coagulation Treatment

作　　者：张秀芝[1] 王静[1] 张雨山[1] 郭鸿博[1] 张爱君[1] 

机构地区：[1]国家海洋局天津海水淡化与综合利用研究所,天津300192

出　　处：《盐业与化工》2011年第1期38-40,共3页Jounral of Salt and Chemical Industry

基　　金：国家"十一五"重大攻关课题资助项目(2006BAB03A08);中央级公益性科研院所基本科研业务费专项资金项目(K-JBYWF-2007-T08)

摘　　要：以海水为试验对象,协同使用天然高分子絮凝剂壳聚糖(CTS)与无机絮凝剂FeCl3,通过烧杯试验,考察pH值对浊度等污染物去除效果的影响。试验结果表明:pH值对混凝效果有较大影响,污染物最佳去除效果的pH值范围并不同步。在pH=7.0～9.0时,浊度和CODMn去除率最高;而TP和UV254去除率随pH值的升高而呈下降趋势。相对于海水(pH≈7.5)而言,降低pH值,可以使UV254,总磷(TP)的去除率分别提高6.1%1,6.5%;升高pH值,化学需氧量(CODMn)去除率可提高4.4%,因此调节pH值是一种经济有效的强化混凝手段。Natural polymer flocculant chitosan（CTS） and inorganic flocculant FeCl3 were used coordinately in the seawater coagulation treatment.Through the beaker tests,influence of pH value on removal effect of turbidity and other pollutants was investigated.The results showed that pH value had great impact on the coagulation efficiency and the best pH value range of optimum pollutant removal effectiveness was not synchronized.While pH ranging between 7.0 and 9.0,the highest removal rates of turbidity and chemical oxygen demand（CODMn） were obtained,but TP and UV254 removal rates decreased with the increase of pH value.Concerned with seawater（pH=7.5）,decrease of pH value can cause increase of UV254 and total phosphorus（TP） removal rates relatively by 6.1% and 16.5%.Increase of pH value could also cause increase of chemical oxygen demand（CODMn） removal rate by 4.4%.In a word,adjustment of pH value was a cost-effective means to enhance coagulation.

关 键 词：海水 PH值 强化絮凝 污染物去除 

分 类 号：X55[环境科学与工程—环境工程]