不同水处理工艺流程对除藻效果的影响

Effect of Water Treatment Process Selection on Algae Removal Efficiency

为了解和考察不同处理流程、各种预氧化剂的除藻效果及对除藻特性的影响,首先研究了春季天津市“引黄”原水藻类的数量与分布特征,发现该季节优势藻为小球藻、绿梭藻和栅列藻。对比了预氯化沉淀、单独气浮、预臭氧化气浮和高锰酸盐复合药剂(PPC)预氧化气浮工艺的除藻效果和除藻特性。结果表明各种工艺流程的除藻特性有明显差异,采用气浮工艺代替沉淀工艺能够提高对原水中不同优势藻的去除率,预臭氧化和PPC预氧化能够进一步提高气浮工艺对优势藻的去除率。PPC预氧化去除小球藻更有效,而预臭氧化去除绿梭藻和栅列藻效果更好。预臭氧化和PPC预氧化能够提高气浮工艺去除叶绿素a的能力。

In order to investigate the effect of different treatment process and various pre-oxidants on algae removal efficiency and performance, study was made on algae quantity and characteristic distribution in raw water diverting from the Yellow River in spring, and it is observed that the dominant species are chlorella, chlorogonium, and scenedesmus. Comparison was made on the processes of pre-chlorination / sedimentation, single air flotation, and preozonation /air flotation and potassium permanganate composite (PPC) preoxidation/air flotation for their algae removal efficiency and performance. The result shows that various processes have significant disparity in algae removal performance. Air flotation process in place of sedimentation can improve removal rate of dominant algae from raw water, and its capability in removing dominant algae can be improved by preozonation and PPC preoxidation. PPC preoxidation is more efficient in removing chlorella, and preozonation is more efficient in removing chlorogonium and scenedesmus. Preozonation and PPC preoxidation can improve the capability of air flotation process in removal of chlorophyll a.