Adaptability of Air Flotation Process for Treating Source Water from South-to-North Water Transfer Project in a Waterworks in North China
Due to the poor treatment performance of source water from the South-to-North Water Transfer Project by the lateral flow inclined plate sedimentation process in a waterworks in North China,the feasibility of treating the source water through air flotation process was examined.By exploring the factors influencing the operation effect of the pilot-scale air flotation system and considering the treatment efficiency and energy consumption of the process,the reflux ratio of the system was determined to range from 7％to 9％,and the dissolved air pressure was 0.25 MPa.Compared to the sedimentation process of the waterworks,the air flotation process was more adaptable to the seasonal variation of the source water quality and had a superior resistance to sharp fluctuations in water quality.The turbidity of the effluent from the air flotation process was 0.21-0.75 NTU,and the CODMn was 0.6-1.6 mg/L during operation.In the source water with algae density of(65.6-543.7)×104 count/L,the removal efficiencies of algae by air flotation and sedimentation processes were 82.9％-97.7％and 29.3％-86.8％respectively.The air flotation process could effectively reduce the residual aluminum in the effluent,and the effluent aluminum concentration was 0.20-0.33 mg/L,which was about 50％lower than that of the sedimentation process.However,there was no significant difference in the removal performance of disinfection by-products between the two processes.
sedimentationair flotationsource water from the South-to-North Water Transfer Projecthigh concentration algae
NETL
NSTL
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