The Optimization Design and Operating Characteristics of Vertical Flow Dissolved Air Flotation Carbon-Sand Dual Media Filter Flofilter

Aimed at the raw water quality characterized by low temperature and low turbidity in winter,high algae and organic matters in summer, the vertical flow-carbon sand dual media filter flofilter was developed to research water purification effect.In the meantime,the pressurized dissolved air system and the filter unit were optimized.Air flotation and filtration were integrated in a structure,which could effectively save land area, and the device had advantages of operation mode flexible and purifying water collaboratively,etc..The results showed that the device could reach better results when the dissolved air pressure was 0.4 Mpa,the reflux ratio was 8% and the filter speed was 8 m/h. The averaged removal efficiency of turbidity,CODMn,the total number of algae and chlorophyll a were 86.49%,43.46%,76.30% and 71.26% by combination process respectively, so water purification effect was significant.