Patent ID: 8691086
Filing Date: 2014-04-08
Classification: B01D,C02F

Abstract:
1. A method of operating a reverse osmosis system comprising: receiving feed fluid at a first pressure; increasingly pressurizing the feed fluid to a second pressure higher than the first pressure using a first pump; communicating the feed fluid to an inlet of a membrane housing, said membrane housing having a membrane, a permeate outlet and a brine outlet; communicating brine outlet fluid from the brine outlet to a turbine portion of a hydraulic energy management integration system (HEMI); retarding rotation of the HEMI while increasingly pressurizing the feed fluid to the second pressure; thereafter, increasing HEMI speed so that feed fluid pressure increases above the second pressure; when a feed fluid reaches the second pressure, increasing the feed fluid pressure to a third pressure using a second pump; while increasing the feed fluid pressure to the third pressure, reducing the HEMI speed; and changing the HEMI speed based on a membrane pressure.