22
5.
Run phase differential pressure
AFM® is a mechanical filter; the primary function is to remove solid particles from the water. AFM® gives exceptional
performance and can remove 99.93% of all particles down to 3 microns using grade 0 AFM® at 2m/hr filtration velocity (IFTS
verified). AFM® can be used to treat potable clean water as well as municipal waste water or industrial water.
AFM® will be exposed to high concentrations of solids; the limitation is related to rate of change of pressure and the back-
wash frequency. AFM® should be back-washed when the pressure differential reaches 0.5 bar, or after a period of 1 week.
The run phase should not be continued for more than 1 week, without a back-wash.
The following graphs presents the run phase delta P across the bed at 20m/hr, and the mass of solids removed by the AFM®.
The loadings relate to engineered particles; in practical applications, the loading rate may be greater of less than 2 kg and
1.3kg for grade 1 and grade 0 respectively. The loading capacity will relate to the size of the particles and their mechanical
properties
Differential pressure vs injected mass at 20m/hr
700
600
AFM grade 1 , load 2000g m2
AFM grade 0, load 1300 g m2
500
grade 0 AFM
400
300
grade 1 AFM
200
100
0
1
3
5
7
9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47
Injected mass grams (g)