Conventional Filtration Process Optimization

The optimal research of regular technics of filtration can make technics of filtration economy and high efficiency.On the basis of extensive and profound analysis of the up-to-now research results of both in country and overseas , this article through former experience further study about optimization of regular technics of filtration.Through contratest, the influence of the filterability caused by change of L/d10 (in which L is the bed depth and d10 is the geometric mean size of the media) is been studied. When L/dio is 1400,the periodic quantity of water produce can reach 160m3 /m2; L/dio is 1200,the periodic quantity of water produce is 120 m3 /m2 ; L/d10 is 1000,the periodic quantity of water produce is 100 m3/m2; The influence of the fiiterability caused by change of rate of filtration is been treated,When rate of filtration is 5 m/h. the periodic quantity of water produce is 110 m3/m2; rate of filtration is 8 m/h, the periodic quantity of water produce is 80 m3/m2; rate of filtration is 14 m/h, the periodic quantity of water produce is 70 m3/m2; The influence of the filterability caused by change of filtration-supporting agents is been studied. When inputting amount of poly aluminium chloride is 50 g/l, the periodic quantity of water produceis 120 m3/m2; inputting amount of poly aluminium chloride is 80 g/l, the periodic quantity of water produce is 112 m3/m2; inputting amount of poly aluminium chloride is 20 g/l, the periodic quantity of water produce is 108 m3/m2. At the same time ,the contratest of poly aluminium chloride, polyferric sulfate, polyacrylamide shows: polyacrylamide improve filterability obviously .The orthogonal test shows the ordinal size that every agent influence filterability is L/dio - rate of filtration - filtration-supporting agents. When L/dio be 1200, rate of filtration be 8m/h , filtration-supporting agents be 50 g/l can bring the best filterability.The results of experiment shows: L/d10, rate of filtration, filtration-supporting agents have bigger influence to filterability. The optimal combination of certain parameter of L/d10, rate of filtration , filtration-supporting agents can improve filterability obviously, get better quality of water outlet, extend the filter cycle, improve periodic quantity of water produce.