Ultra filtration system is provided for removal of turbidity and to reduce the SDI level to enhance the recovery rate through the UF Membranes.
Instruments i.e. Rota meter, pH Indicator, Conductivity Meter and Temperature Indicator are provided online i.e. before Ultra Filtration System for measuring the parameters.Ultra Filtration systems are pressure-driven membrane operations that use porous membranes for the removal of dissolved and colloidal material. These systems differ from Reverse Osmosis Systems by relatively low driving pressures, usually under 1034 kN/m2. Ultra Filtration is normally used to separate colloidal material and large molecules with molecular weights in excess of 5000 from salts and low molecular weight materials, with pores of 0.001 to 0.1 micron. Turbidity is sharply reduced by 99+ %. UF is an excellent means to remove metal hydroxides, reducing the heavy metal content to 1ppm or less.
Due to suspended solids present in the raw water, UF feed system gets clogged over a period of time and needs cleaning / backwashing periodically. When the Trans Membrane Pressure (TMP) across the UF membrane modules gets increased to a predetermined set point, backwashing through the backwash pumps will take place manually. Cleaning of the membrane in the UF system will be required periodically with the chemicals i.e., Sodium Hypo Chloride and Hydrochloric Acid, having high and low pH to remove the biological growth retained over the UF membrane.
