Lanxess AG has announced a new addition to its LewaPlus software suite of reverse osmosis (RO) and ion exchange (IX) system dimensioning capabilities. The new module provides system modelling with Desalitech’s Closed Circuit Reverse Osmosis (CCRO) technology and enables the dimensioning of RO systems using the latest available water treatment technology. And helping system designers bring their water treatment footprint closer to zero liquid discharge (ZLD) or minimum liquid discharge (MLD) goals.
Reverse osmosis is used for the desalination and purification of water and has been growing rapidly in industrial, municipal and wastewater reuse applications. The technology is widely used, especially in areas of water stress such as the American West.
The system operates in two alternating modes: Closed Circuit (CC) mode at 100 percent recovery and Plug Flow (PF), or flushing mode, at 10 to 50 percent recovery.
During CC operation, permeate is produced at a rate equal to the flow rate from the high-pressure pump. When a desired recovery percentage is reached, the operating mode is switched to PF mode in which concentrated brine is purged from the system and displaced by feed water from the high-pressure pump in a single plug-flow sweep.
The new software module was developed cooperatively by Lanxess Sybron Chemicals and Desalitech Inc (Newton, US). Until now, the modelling of the CCRO process was based on experience values without energetic optimization, which generally limited CCRO projections for recovery rates and system capabilities.
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