驱气混凝沉淀法对含藻超饱和溶解氧水的处理效果  

Performance of Gas-driven Coagulation Sedimentation Technology for Treating Algae-containing Supersaturated Dissolved Oxygen Water

作　　者：丛海兵[1] 张磊 吴翔 徐俭 成芃荣 吴银杰 傅启飞 CONG Hai-bing;ZHANG Lei;WU Xiang;XU Jian;CHENG Peng-rong;WU Yin-jie;FU Qi-fei(College of Environmental Science and Engineering,Yangzhou University,Yangzhou 225127,China;Cyanobacteria Management Office of Wuxi City,Wuxi 214000,China;Huai’an Hongze District Water Resources Bureau,Huai’an 223199,China)

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225127 [2]无锡市蓝藻治理办公室,江苏无锡214000 [3]淮安市洪泽区水利局,江苏淮安223199

出　　处：《中国给水排水》2024年第5期16-22,共7页China Water & Wastewater

基　　金：国家重点研发计划项目(2022YFC3203604)。

摘　　要：针对含藻超饱和溶解氧水混凝沉淀效果差的问题,研究了鼓风曝气驱赶超饱和溶解氧的能力,考察了曝气驱气混凝沉淀法对含藻超饱和溶解氧水的处理效果。结果表明,藻类光合作用产生的超饱和溶解氧在絮凝剂表面凝聚成气泡,为絮体提供浮力,影响絮体的沉淀效果,甚至上浮形成浮渣;鼓风曝气法能较好地驱赶超饱和溶解氧,水深越浅则驱赶速度越快,当曝气量为9 L/min、水深为1.5~3 m时,曝气驱赶超饱和溶解氧的能力为2.71~1.22 mg/L(以单位体积标准空气驱赶的超饱和溶解氧量计)。含藻超饱和溶解氧水源水经曝气后再混凝沉淀,出水水质大幅度提高,当水源水的溶解氧饱和度分别为156.8%、131.4%、102.7%时,出水浊度分别为12.40、5.85、3.76 NTU,COD_(Mn)去除率分别达到18.2%、29.3%、40.4%,叶绿素a去除率分别达到15.0%、45.5%、54.9%。In view of the poor coagulation sedimentation performance of algae-containing supersaturated dissolved oxygen water,this paper investigated the ability of blast aeration to drive away supersaturated dissolved oxygen from algae-containing water,and analyzed the treatment effect of aerated gas-driven coagulation sedimentation process.The supersaturated dissolved oxygen produced by algae photosynthesis aggregated into bubbles on the surface of the flocculants,provided buoyancy for the flocs,affected the sedimentation performance of the flocs,and even floated to form scum.The blast aeration drove away the supersaturated dissolved oxygen well.The shallower water depth led to the faster driving rate.When the aeration rate was 9 L/min and the water depth was between 1.5 m and 3 m,the aerated driving rate was in the range of 2.71-1.22 mg/L(supersaturated dissolved oxygen driven by standard air per unit volume).The effluent quality was greatly improved when the algae-containing supersaturated dissolved oxygen raw water was first aerated and then coagulated and settled.When the dissolved oxygen saturation of algae-containing raw water was 156.8%,131.4%and 102.7%,the turbidity of coagulation sedimentation effluent was 12.40 NTU,5.85 NTU and 3.76 NTU,the removal rates of COD_(Mn) reached 18.2%,29.3%and 40.4%,and the removal rates of chlorophyll-a reached 15.0%,45.5%and 54.9%,respectively.

关 键 词：含藻水 超饱和溶解氧 曝气 混凝沉淀 

分 类 号：TU991[建筑科学—市政工程]