Patent ID: 6758973
Filing Date: 2004-07-06
Classification: C02F,Y02W,Y10S

Abstract:
A method for cleaning surface or waste water, including the following successive steps of:A. supplying the water to a sludge separator and separating suspended material therefrom, B. thereafter lowering a BOD content of the water by supplying the water to at least one biostep filter and passing the water through a permeable material of a type permitting growth of a bioskin thereon thereby creating a micro process without lowering the permeability of the material, whereby biological pollutants are deposited on the at least one biostep filter, C. thereafter reducing a content of metals which may include phosphoric and heavy metals from the water in an ion exchange process by forwarding the water to a sorbent chamber including a filter of a sorbent material, wherein the water is distributed over the sorbent material and flows through the sorbent material, and D. thereafter forwarding the water to a recipient, wherein the at least one biostep filter prevents organic material from growing on the sorbent material of the sorbent chamber filter.