Optimized for ZLD and MLD

Maximizing energy savings in ultra high-pressure applications

Sustainable treatment of industrial wastewater can help drive a circular water economy, reduce emissions, and recover valuable resources from wastewater. By using our cutting-edge U Series devices to increase the efficiency of ultra high-pressure reverse osmosis (UHPRO), implementing minimal and zero liquid discharge can become less costly and reduce harmful discharge into the surrounding environment. The PX U Series is tailored for UHPRO applications, can handle higher brine concentrations, and operates at pressures of up to 120 bar (1,740 psi). Its modular design makes it ideal for small or large wastewater treatment plants.

How it works

Image of the ZLD Workflow diagram.

65%

Potential recovery, in all flow conditions, of otherwise wasted energy

30 Years

Designed to last with no scheduled maintenance

97%

Peak efficiency of U Series

1740 PSI

Maximum operating pressure of U Series

Typically, in plants using ZLD or MLD for wastewater treatment, 50% of the cost is driven by the last 10% of the process due to the use of high-cost treatment technologies such as mechanical vapor compression (MVC), forward osmosis (FO), and electrodialysis (ED). UHPRO moves the cost of those technologies further downstream. The PX U Series further reduces the energy waste of the UHPRO process by returning pressure energy to the system, ultimately reducing overall energy costs.

Ultra High-Pressure PX

Image of a graph depicting the Ultra High-Pressure PX flow range.

Frequently Asked Questions

The Ultra High Pressure PX enables efficient energy recovery in ultra-high-pressure RO trains operating up to 120 bar, helping plants concentrate high-salinity brines for MLD/ZLD at much lower specific energy consumption. By transferring pressure energy directly from the concentrate stream to the incoming feed, it reduces high-pressure pump load and overall power demand. Plants typically see double-digit energy savings versus UHPRO systems without isobaric energy recovery, along with more stable operation under variable feed conditions.

The Ultra High Pressure PX uses Energy Recovery’s proven ceramic rotor technology and a simple single-moving-part design to minimize mechanical wear, even in ultra-high-pressure service. High-purity alumina ceramics withstand erosion and corrosion from aggressive concentrates. This robust materials-plus-simplicity approach supports industry-leading uptime, long operating cycles, and predictable lifecycle cost in UHPRO ZLD/MLD environments.

Yes. The Ultra High Pressure PX integrates into new or retrofit UHPRO designs with minimal layout changes, using the same isobaric installation approach as other PX devices. By recovering significant pressure from the concentrate stream, it can reduce required high-pressure pump size or unload multistage pumping in ZLD trains. This lowers CAPEX, simplifies the energy-recovery loop, and supports efficient operation across wide pressure and flow ranges typical of high-salinity concentration systems.

Upcoming Events

Interested in Meeting Us?

All Events

Check out the latest information on upcoming conferences, webinars, meetings, and other events that we’re involved with.

All Events

Wastewater

2026 WateReuse Symposium

Los Angeles, CA

Join us at the WateReuse Symposium in Los Angeles, California on March 8-11, 2026. The Annual WateReuse...

Related Industries

Building a more sustainable future where energy efficiency drives operational profitability.