Research on Rapid Physical Treatment Technology for Initial Rainwater
Two ultrafiltration membrane rapid treatment processes,coagulation sedimentation ultrafiltration and coagulation ultrafiltration,were used to conduct pilot experiments on initial rainwater.The experimental results showed that the ultrafiltration membrane process had good removal effects on pollutants such as CODCr,TP,and SS in initial rainwater.At the same time,the ultrafiltration membrane rapid treatment process is used to treat polluted rainwater,which has comprehensive advantages such as small footprint,fast start-up,intermittent operation,and high removal rate of pollutants in initial rainwater.It is very suitable for projects that require efficient and rapid treatment of polluted rainwater.Through the study of different parameter settings in the rapid treatment process of ultrafiltration membranes,it was found that there is a significant turning point in the concentration of flocculants added.When the concentration exceeds the turning point,the pollutant removal rate does not increase significantly with the increase of added concentration.The high or low membrane flux during operation has no significant impact on the removal efficiency.Compared with the short process coagulation ultrafiltration process,the removal efficiency of pollutants in initial rainwater by the coagulation sedimentation ultrafiltration process is not significantly different.
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