Hollow fiber membranes are used to produce high quality treated water. Due to its fine pore size of upto 0.1 micron it ensures complete removal of silt, colloids, bacteria, cyst such as Cryptospordium and Giardia upto log 6. At the same time, it concentrates removed particles for further processing or disposal. We provide Microfiltration, having the largest market share in membrane filtration for RO pretreatment and drinking water technology across the world. The key to the efficient operation of the unit is the patented air scour process that is used at regular intervals to remove the concentrated particles from the fibers. The backwash air is introduced within the membrane bundles and scours the surface of the membranes with a scrubbing action that is not achievable with external air scour techniques.

The individual membrane known as sub-module contains thousands of hollow fibers surrounded by a protective plastic screen and sealed with polyurethane “pots” at both ends. The top pot allows filtered water to pass from the hollow inner core, or lumen, of the membrane fibers to the filtrate manifold. The bottom pot seals the ends of the fibers but allows low pressure process air to pass through a series of holes to the outside surface of the membranes within the fiber bundle during backwash.

Sub-modules are firstly connected to groups of four via a sub-manifold. Sub-manifolds are connected via a stainless steel manifold to form a module rack of sub-manifolds. The filtrate connection is via each top sub-manifold whilst backwash airflow is connected via a central tube over the bottom sub-manifolds.

The MF system works on unique OUTSIDE IN concept i.e water molecule travels from outer surface of the fiber to inner surface and finally collected through the capillary of individual fiber. During this process removal of suspended impurities is ensured and these impurities remain at the outer shell of each fiber which can be easily loosened by the dual action of low pressure air scour and flow of backwash water from INSIDE OUT. This process ensures complete removal of suspended as well as colloidal impurities therefore, making it suitable for drinking application as well as RO pretreatment application.

During operation, screened feed water enters the bottom of the membrane tank and passes over and around the microporous hollow fiber membranes. Clean water is drawn through the membrane wall by suction pressure into the center of each membrane fiber. Filtrate flow passes from the top of each module rack to the filtrate manifold. Backwash operation in the MF system is carried out by Filtrate pump and the complete operation is PLC based.