Application of Side-flow Lamella Tank in Expansion of a Medium-sized Waterworks
The design capacity of a waterworks in Shenzhen is 16×10 4 m3/d,and the expansion capacity is 16×10 4 m3/d.To solve the problems of aging and sludge accumulation in the traditional inclined tube sedimentation tank,a new type of side-flow lamella tank is adopted in the expansion process.The operation results show that the effluent turbidity of the side-flow lamella tank is 30％lower than that of the traditional inclined tube sedimentation tank with the same dosage.The influence of sludge scraping and discharging is controllable.The forward flushing of side-flow lamella has a great influence on the effluent turbidity of the sedimentation tank,and it takes 2.5 h for the effluent to recover to 0.5 NTU.So,the forward flushing must be set at non-rush hour.There are back mixing and alum escaping phenomena in the steady effluent zone.It is suggested to reduce the running speed of the sludge scraper and optimize the distribution of lamella to further improve the operation effect of the process.
side-flow lamella tankeffluent turbidityforward flushingsteady effluent zone
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