Uniform Media Micro Flocculation And Filtration Treatment Of Slightly Polluted Source Water In The Pilot Study

Filtration, as one of a key method of water treatment which can meet people's water quality requirements, is more and more concerned by people. In order to minish the difference from the developed country. Effluent quality must measure up the new standard of drinkable water. Except for the smell, chroma and turbidity, we must get rid of the organic substance greatly. The programming goal was come out in "development program of 2010": present process must be altered reasonably and the effect of traditional disposal should be full exerted. It is evident that overhauling present water plant and technique improving in a future time will be an important content and research task of water supply field in our country.This paper aimed at the research hotspot of micro-coagulated filtration by uniform gravel medium. We Selected three different series uniform mediums {d= (0.6⁰.9mm,0.9¹.43mm,1.43².0mm)} from Qujiang plant and Tian jia wan plant in Xi'an and combinated four types of flocculate dispels which was used in treating micro-polluted surface water confected from yellow river. The compared results are below:1) Small diameter quartzite (d=0.6-0.9mm) is the best while the wide diameter quartzite is the worst.2) Small diameter quartzite (d=0.6⁰.9mm) had got a better effect using PAC to micro-coagulate filtration than the other combinations. Especially at the 18 degree of water temperature, turbidity of effluence from column-filter could reach 0.2 NTU, even 0.1NTU when the system arrived at tranquilization. The removal rate for COD_Mn could also reach over 35 percent; the best dosage of PAC was 1.0mg per liter of the moment. While at the temperature of 10 degree, the turbidity of effluence was average to 0.4NTU and the removal rate for COD_Mn reduced to 20 percent, at the moment the best dosage for PAC was 1.5mg/L.3) At the temperature of 18 degree. The removal rate for UV₂₅₄ average reduced to 40% while at 10 degree this rate average reduced to 20 percent. It showed a good linearity -correlation with the removal rate to...