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ReFlex™ Reverse Osmosis Closed Circuit Desalination with Enhanced Recovery

ReFlex™ Reverse Osmosis Closed Circuit Desalination is an Innovative Solution to Low Recovery Rates & the High Operating and Capital Costs of Conventional RO Systems. Increase RO Recovery Rates as much as 95% and Achieve Exceptional Payback in Industrial Applications.

Enpure's water treatment experts can retrofit your a conventional RO System and save you operating and capital expenses utilizing advanced and proprietary process design & engineering.

Obtain recovery rates as high as 95% for a given water chemistry, for industrial applications:

A REFLEX™ RO system combines media filtration with reverse osmosis to achieve recovery rates up to 95%. Like conventional RO, ReFlex RO uses crossflow but it uses internal circulation to provide higher better distributed crossflow which removes dissolved species from the membranes. Like media filtration the feed flow equals the permeate flow and the concentrate is purged periodically. ReFlex RO works in a batch wise fashion in two modes, closed circulation desalination and plug flow desalination. When in closed circuit desalination, the feed water flow equals the permeate flow. While brine is circulated in a closed loop to provide cross flow, dissolved salts accumulate in the system volume. As the salt concentration gradually increases, the pump pressure automatically increases to give a constant permeate flow. When the desired recovery rate is achieved a brine valve opens to release the concentrate and the fresh feed water pushes it out with plug flow while flushing the membrane surfaces. When the concentrate is fully rejected the brine valve closes and a new cycle begins again.

Conventional RO typically achieves up to 75% recovery rates and requires 3-4 stages to get recovery rates higher than 85%. REFLEX™ RO systems achieve recovery by recirculation, not with multiple membrane elements and stages in series, and can therefore reach any desired recovery up to 95%. Over 98% has been demonstrated, limited only by the scaling characteristics of the pretreated feed water. Re- FlexTM RO uses shorter membrane arrays than those in conventional systems, which eliminates low flux tail elements and minimizes lead element flux and can accommodate a higher average flux minimizing scaling. High recovery in a single stage is a novel capability of REFLEX™ RO that lowers cost and makes design and operation simple. REFLEX™ RO also avoids scaling that occurs in high recovery conventional RO systems by flushing membranes frequently with feed water during the plug flow mode part of the cycle. In addition, the short introduction time the membranes are exposed to high salinity as the salt concentration gradually increases, disrupts and greatly reduces scaling and fouling. Since the cycle time or time the membranes are exposed to the gradually increasing brine, is shorter that the time it takes for scale to precipitate and build up, frequent brine rejection can stop and even reverse precipitation. All of these features enables REFLEX™ RO to achieve up to 95% recovery even from difficult source waters.

Applications:

• New Systems
  
• Retrofit to existing RO systems
  
• RO Pretreatment of Softened Feedwater
• RO Pretreatment of Demineralized Water

 

REV: 15-May-2018