摘要
Abstract
In order to solve the problem of low turbidity of raw water and difficulty in forming sufficient sludge reflux in early stage of operation the high efficiency mid-flocculation and sedimentation tank of water treatment plant(WTP),the effects of different parameters(type of mud source,reflux ratio,and dosage of chemicals)on the flocculation and sedimentation effect of raw water from the external mud source were studied in detail by beaker test.The results showed that the flocculation and precipitation effect was the best when the reflux ratio of raw water added with 100 mesh diatomite was 3％,the mass concentration of PAC was 3 mg/L,and the mass concentration of PAM was 0.15 mg/L,which was due to the fact that the diatomite with porous structure and good adsorption performance improved the chance of particle collision and adsorption bridging,and enhanced the sludge sedimentation performance.When the mass concentration of PAC was 3 mg/L,the mass concentration of PAM was 0.22 mg/L,and the sludge reflux ratio was controlled at 2.5％,the turbidity after sinking was the lowest,which determined the role of diatomite in the operation of the high efficiency mid-flocculation and sedimentation tank.The addition of diatomite to the high efficiency mid-flocculation and sedimentation tank can quickly start the sludge reflux,improve the coagulation effect,enhance the sedimentation performance of the sludge,ensure the stability of the water quality after sedimentation,ensure the normal operation of thehigh efficiency mid-flocculation and sedimentation tank,and provide reference and basis for the production and operation of high efficiency mid-flocculation and sedimentation tank of similar WTPs in China to treat low-turbidity water.关键词
硅藻土/高效沉淀池/高效絮凝/浑浊度/加药系统/污泥回流Key words
diatomite/high efficiency mid-flocculation and sedimentation tank/high efficiency coagulation/turbidity/dosing system/sludge backflow分类
土木建筑
