压力强化混凝沉淀除藻工艺研究  

Process development of pressure reinforced coagulation and sedimentation for removing Cyanobacteria in source water

作　　者：丛海兵[1] 陈雯婧[1] 徐亚军[1] 王巍[1] 张颖[1] 

机构地区：[1]扬州大学环境科学与工程学院,扬州225127

出　　处：《环境科学学报》2013年第7期1862-1867,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.51178408);国家科技支撑计划项目(No.2012BAC04B02)~~

摘　　要：为了强化蓝藻混凝沉淀去除效果,采用外加压力破坏藻细胞内气囊,使藻类失去浮力,再经混凝沉淀去除.通过静态实验测定了太湖蓝藻水在0～0.7MPa预压力作用后混凝沉淀效果,并与预氧化混凝沉淀工艺进行了比较.结果表明,在预压力0.4～0.7MPa作用下取得了较好的效果,沉淀出水浊度为1.04～0.69NTU;叶绿素a浓度为2.9～0.8μg·L-1,去除率为95.8%～98.8%;CODMn为3.8～2.9mg·L-1,去除率为66.2%～74.1%;UV254值为0.0686～0.0646,去除率为23.7%～28.1%.预加压工艺比预氧化工艺节省混凝剂50%.动态实验表明,预压力混凝沉淀过滤出水浊度小于0.25NTU;叶绿素a浓度小于1μg·L-1,平均去除率为99.5%;CODMn小于3.6mg·L-1,平均去除率为70%;UV254值小于0.057,平均去除率为33.7%.过滤出水水质优于饮用水水质标准.In order to improve the removal efficiency of cyanobacteria by coagulation and sedimentation process, external pressure was applied on algae cells to destroy the gas vesicle within it. As a result, the algae loses buoyancy, and can be easily removed by coagulation and sedimentation. Static coagulation sedimentation experiment was performed with the pre-pressure of 0～0.7 MPa, and compared with pre-oxidation coagulation sedimentation process. The result is perfect in the pressure range of 0.4～0.7 MPa. The turbidity of water after sedimentation is 1.04～0.69 NTU. The concentration of Chlorophyll-a is 2.9 ～ 0.8 μg·L^-1, and the removal rate is 95.8 % ～ 98.8 %. The concentration of COD M, is 3. 8 ～ 2. 9 mg·L^-1, and the removal rate is 66.2% ～ 74. 1%. The concentration of UV254 is 0. 0686 ～ 0. 0646, and the removal rate is 23.7%～28. 1%. Pre-pressured process saves coagulant by 50% compared to pre-oxidation process. The dynamic experiment shows that the turbidity of pre-pressure coagulation and sedimentation filter water is less than 0.25 NTU. The concentration of chlorophyll-a is less than 1 μg·L^-1 , and the average removal rate is 99.5%. The concentration of COD_Mn is less than 3.6 mg·L^-1, and the average removal rate is 70%. The concentration of UV254 is less than 0. 057, and the average removal rate is 33.7%. The filtered water quality is better than the drinking water quality standards.

关 键 词：蓝藻 预压力 沉淀 浊度 叶绿素 

分 类 号：X703[环境科学与工程—环境工程]