Feed cycling in dead end filtration

The dead end ultrafiltration of dispersions of active carbon in water was s tudied. High flux of the permeate and effective purification were goals of the studies. Cyclical flow of the feed (cycling) was found to be the best c ondition for good purification. During the purification of the membrane, an air/water dispersion was injected into the hollow fiber membrane (air spar ging) to improve the cleaning effect. A Simplex optimization of significant parameters was carried out. The behavior of pressure drop and module entra nce pressure permitted the classification of the values into two groups. A different build-up of the cake of these groups during the filtration is pos sible.