Patent ID: 7422690
Filing Date: 2008-09-09
Classification: B01D,C02F

Abstract:
1. A filtering system comprising: an inlet for liquid to be filtered, an outlet for filtered liquid, and filtering means, placed as modules in series, the filtering means comprising: a first filter comprising activated carbon to provide a primary filtration of up to approximately 0.5 μm, an ultrafiltration membrane having a pore size of approximately 0.02 μm, a valve disposed between the first filter and the ultrafiltration membrane, or disposed between housings in which the first filter and the ultrafiltration membrane are accommodated, the valve in a first position connecting the first filter with the ultrafiltration membrane, and in a second position connecting the ultrafiltration membrane with a drain for discharging contaminant from the ultrafiltration membrane via said valve; a post-treatment filter comprising activated carbon with a microfiltration module that is connected to the outlet; and a storage vessel for filtered water disposed between the ultrafiltration membrane and the post-treatment filter, said filtered water backwashing the ultrafiltration membrane when the valve is in the second position.