Systems and methods for water treatment by reverse osmosis or nanofiltration

摘要

The present invention relates to systems and processes for treating feedwater, wherein the system receives a feed under high pressure and produces a concentrate that is directed into a concentrate accumulator and held at a low pressure in the concentrate accumulator. Including at least one RO or nanofiltration unit. Generally, the permeate or inlet feed is maintained at a constant flow rate. Periodically, the system is switched from mode 1 or a normal operating process to mode 2 where the concentrate is drained from the concentrate accumulator. However, in mode 2, the feedwater is further directed into the system and through an RO or nanofiltration unit that produces permeate and concentrate.