水体pH值时空变化条件下絮凝除藻剂的pH值优化  

pH VALUE OPTIMIZATION OF ALGAL-REMOVING FLOCCULANT UNDER CONDITIONS OF TEMPORAL AND SPATIAL VARIATION OF pH OF WATER

作　　者：宁雅[1] 吴刚[1] 赵以军[1] 程凯[1] 

机构地区：[1]湖北工业大学资源与环境工程学院河湖生态修复与藻类利用湖北省重点实验室,武汉430068

出　　处：《环境工程》2017年第1期41-45,共5页Environmental Engineering

基　　金：湖北省科技支撑计划(2014BCB037);武汉市科技攻关计划(2014060101010061)

摘　　要：研究了由光照、水深等造成的水体pH值变化对絮凝剂除藻效果的影响,并监测絮凝前后不同深度的水体pH值。结果表明:1)当水体pH值无垂向分层,但随光照在8.5~10.5变化时,表层水体终点pH值为5.8~7.9,除藻效率均高于80%,此时中下层水体pH值为5.4~8.0;2)当水体pH值有垂向分层,表层水体终点pH值为7.0~7.3时,除藻效率均高于80%,此时中下层水体pH值为7.0~7.1;3)水池实验中,当表层水体终点pH为6.8时,除藻率高达99.33%,此时中下层水体pH值为7.0~7.1,池水清澈见底。上述结果说明:不论水体pH值是否垂向分层,控制表层水体终点pH值为6.8~7.3时既能有效除藻,也不会使底层水体pH值过低;水体pH值有垂向分层时,絮凝剂的pH值应高于无垂向分层时的情况。In the present work,the effect of variation of pH of water caused by solar radiation and depth of water on algalremoving efficiency by flocculant was studied,and the pH value at different water depth before and after the addition of flocculant were also monitored. The results indicate that： 1） When the water pH value did not stratify but changed from 8. 5 to10. 5 with solar radiation,the final pH value of surface layer water should be controlled to 5. 8 ~ 7. 9 to get a more than 80%of algal-removing efficiency,and the pH value of middle and bottom water ranged from 5. 4 ~ 8. 0 in these conditions; 2） when the water pH value stratified,the final pH value of surface layer water should be controlled to 70 ~ 7. 3 to get a more than 80%of algal-removing efficiency,and the pH value of middle and bottom water ranged from 7. 0 ~ 7. 1 in these conditions; 3） in the pool experiment,the algal-removing efficiency was 99. 33% and the water transparency was higher than 150 cm when the final pH value of surface layer water was at 6. 8,and the pH value of middle and bottom water ranged from 7. 0 to 7. 1 in this condition. These results suggested that： No matter the pH value stratification existed or not,the final pH value of surface layer water should be controlled to 6. 8 ~ 7. 3 to not only obtain the best algal-removing efficiency but also keep the pH value of bottom water not change too much; when the water pH value stratified,the pH value of flocculant should be set to higher than that in the condition of no pH stratification.

关 键 词：野生微囊藻 PH值 分层 

分 类 号：X52[环境科学与工程—环境工程]