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

Claim 0:
1. A system for cleaning feed water of variable quality, the system comprising:
an inlet for selectively delivering feed water to one or other of at least two feed chambers, each of the at least two feed chambers having an associated delivery pipe for delivering feed water to a reverse osmosis or nanofiltration membrane;
a pump to deliver the feed water from one or other of the at least two feed chambers through its associated delivery pipe to the reverse osmosis or nanofiltration membrane to create a concentrated feed stream and a product water stream;
return pipes for selectively returning the concentrated feed stream to one or other of the at least two feed chambers;
a product water outlet for removal of the product water;
means for switching the delivery of the concentrated feed stream between the return pipes upon detection of a predetermined reduction in the efficiency of the RO or NF process within one or other of the at least two feed chambers;
at least one desaturation unit provided in at least one return pipe between the reverse osmosis or nanofiltration brine and one or other of the at least two feed chambers; and
at least one pressure exchanger for reducing pressure of the concentrated feed stream prior to feeding the concentrated feed stream through the at least one desaturation unit.