Ultrafiltration plant “Crystall-UF”

Ultrafiltration process relates to baromembrane processes. Filtration with the hollow-fiber ultrafiltration membranes can be carried out in two modes: 

1. Dead-end mode
2. Tangential filtration mode

In the dead-end filtration mode all water, which is brought to the membrane, is filtered through it. All impurities, which are in the feed water, are accumulated on the surface of the membrane and removed while flushing with backwater.
The dead-end filtration mode is used in most cases, related to water treatment. Content of suspensions in most water supply sources is much lower than in traditional tangential filtration mode applications.
The tangential filtration mode is sometimes used in ultrafiltration processes to prevent the excessive growth of sediments on the membranes surface. High speeds of the tangential flow create turbulence in the water supply channel and ensure high efficiency of surface cleaning from accumulated impurities, which is especially effective for water with a high content of undissolved suspensions. 
One of the main processes in the ultrafiltration plant’s operation is flushing that serves for removal of impurities formed during the membrane’s operation. Impurities are removed by means of direct- and back flushing. Flushing water is discharged into the sewer system. This arrangement of the process enables to get optimal expenses of treated water and prolongate the system life cycle.
Feed water is supplied to the ultrafiltration plant by means of booster pumps. Mechanical treatment is installed before water supply to the ultrafiltration plant for removal of coarse impurities (100-300 µm). Depending on the source water composition, reagents (coagulating agent, hypochlorite etc.) can be dosed prior to the ultrafiltration plant. Treated water comes in the clean water reservoir (CWR) and the part of it is taken from the reservoir for further back flushing.