On the basis of the double factor test for the filter rate v and the particle diameter of filter medium d , this paper analyzes the relation between the drag growth coefficient K and the filter rate v and the particle diameter of filter medium d during the direct filtration, and establishes the mathematics model.

Influence factors on filtration rate in sludge filtration process;

Pilot test was conducted to investigate the effect of L/d value,filtration rate and filtration aid on filtration in order to optimize filtration parameters.

PCF varying pore fiber filter is a water treatment device,which has such characteristics as high filtration accuracy,backwash thoroughly,filtration rate as high as 100 m3/(m2·h),low self water consumption.

An equation is founded, which represent static pressure distribution of purifying unit rectangle passage, and filter velocity distribution is also researched into.

6 m)?filtering velocity(<12 m/h)?ratio of gas to water(9~11),a.

The optimal process parameters are aeration time of 60 min,DO concentration of 2 to 3 mg/L,water temperature of 22 to 25 ℃ and initial filtering velocity of 5 m/h at lower filter bed.

Effect of filter speed on the result of removing micro-pollution from drinking water by high gradient magnetic filter (HGMF);