Patent ID: 11890577
Assignee: IDE WATER TECHNOLOGIES LTD
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 12:
13. A system for cleaning feed water, the system comprising:
a first feed chamber and a second feed chamber, each of the feed chambers for receiving feed water and each of the feed chambers comprising a delivery pipe for delivering the feed water;
a pump to deliver the feed water from the first feed chamber through the first delivery pipe through a reverse osmosis (RO) or nanofiltration (NF) membrane, thereby generating a concentrated feed stream and a product water stream;
a first return pipe and a second return pipe, each of the return pipes for selectively returning the concentrated feed stream to the feed chambers;
a product water outlet for removal of the product water stream;
a pressure exchanger for reducing pressure of the concentrated feed stream prior to feeding the concentrated feed stream through at least one desaturation unit;
a switching mechanism for switching delivery of the concentrated feed stream between the first return pipe and the second return pipe upon detection of a predetermined reduction in efficiency of the RO or NF membrane; and
the at least one desaturation unit provided in at least one of the return pipes between the RO or NF membrane and at least one of the feed chambers,
wherein the feed water passes through the at least one desaturation unit prior to, or after, its passage through the RO or NF membrane.