Ultrafiltration

Ltd. "Water Technology Engineering" uses ultrafiltration for clarification, and purification of water from any source: a well, a surface source, waste water.

Ultrafiltration - the most effective process for the preparation of feed water nanofiltration, reverse osmosis, ion exchange.

Technology ultrafiltration allows removing suspended solids, reduce turbidity, organic matter content (reduction of Chemical Oxygen Consumption, Biochemical Oxygen Demand, etc.).

Ultrafiltration membranes are specifically designed to remove suspended particles. Pressurized water flows through the membrane and the particles remain on the surface. Due to the small pore size of the membrane all the suspended solids, including bacteria, are effectively removed from water. Since such particles produce sediment at the membrane surface, the direction of flow changes periodically (backwash) to remove this layer. In the ultrafiltration achieved quality indicators purified water: turbidity less than 0.1 NTU; SDI15 sludge density index of less than 3.0; reduction of viruses and bacteria by 4 or more orders of magnitude; reduction of oxidation of 65% or more. These advantages will eventually allow to significantly increase the efficiency of reverse osmosis membrane elements, in the case of ultrafiltration as a pretreatment.

Ultrafiltration modules - a hollow cylindrical housing within which is located a plurality of capillaries (tubules) with an inner diameter of 0.7-1.0 mm. Material capillaries - with special additives polyether sulfone (PES). This hydrophilic material that is resistant to the layering of organic sediment. Filtration area one module from 30 to 70 m2. A stream typically flows from the inside to the outside the capillaries, i.e. feed water flows inside the capillary, and the filtrate emerges through their walls. The reverse filtration direction.

Ultrafiltration may be used for single-stage treatment of relatively clean water, and in combination with the stages of coagulation, sedimentation, mechanical filtration or clarification.

Given the physical characteristics of the resulting high permeate ultrafiltration can be recommended as a preferred solution for removing particles clogging a reverse osmosis membrane before being fed to the reverse osmosis unit.

Compared with conventional purification methods, ultrafiltration has many advantages:

• ultrafiltration is a reliable protection against microorganisms, including the microorganisms resistant to chlorine and suspended solids;
• the quality of the filtrate is weakly dependent on the quality of water supplied;
• compact system saves production space and is more ergonomic than conventional treatment systems;
• ultrafiltration process is easily automated;
• subsequent purification steps are more effective, since almost all suspended solids removed during ultrafiltration.

Given that a ultrafiltration membrane technology, it has some disadvantages typical of membrane methods, namely, surface dirt, which are not removed usual backwashing, necessitating special chemical leaching. It is essential to simplify the operation of ultrafiltration installations and to extend the period between chemical washes can use as a pretreatment chemical treatment and mechanical filtration.