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为了探明深水循环混凝沉淀工艺处理含藻水的效果和机理,采用U形管模拟深水循环装置对含有铜绿微囊藻的原水进行预加压,再进行混凝沉淀处理,测定了40~80 m深水循环混凝沉淀的处理效果,探究了深水循环除藻机理,并评价了水质安全性.结果表明:随着循环深度的加大,深水循环混凝沉淀效果越好;在投药量30 mg·L-1时,60~80 m深水循环混凝沉淀对藻类去除率达到95%以上,浑浊度小于1.6 NTU,处理效果比原水直接混凝沉淀、预氧化混凝沉淀显著提高.深水循环利于藻类去除的机理是,藻细胞内气囊受深水水压作用而坍塌破裂,气囊内气体透过细胞壁扩散进入水中,藻体失去气囊浮力,由上浮转而下沉.深水循环及混凝沉淀阶段水中的藻毒素、DOC均未增加,说明深水循环混凝沉淀工艺处理含藻水是安全的.
In order to find out the effect and mechanism of treating algae-containing water with deep-water circulating coagulation and sedimentation process, U-shaped tube deepwater circulation device was used to pre-pressurize the raw water containing Microcystis aeruginosa and coagulation sedimentation, 80 m deep-water circulation coagulation and sedimentation, the mechanism of algae removal in deep-water cycle was explored, and the water quality safety was evaluated. The results showed that the deeper the circulation coagulation and sedimentation was, the better the circulation depth was. mg · L-1, the removal efficiency of algae reached more than 95% and the turbidity was less than 1.6 NTU in 60-80 m deep-water cycle coagulation sedimentation, the treatment effect was directly coagulated and precipitated compared with raw water, and the pre-oxidation coagulation and sedimentation significantly increased. The algae removal mechanism is conducive to algae cells within the balloon under the action of deep water pressure collapse and collapse, the airbag gas diffusion through the cell wall into the water, algae loss of airbag buoyancy, from the sink and sink to the deep water cycle and coagulation sedimentation stage Algae toxins in water, DOC did not increase, indicating that deep-water cycle coagulation and sedimentation process is safe for treatment of algae-containing water.