Energy Recovery Solutions for Low Pressure RO Systems

Energy Recovery has spent 30 years perfecting the reliable, field-proven, and trusted PX Pressure Exchanger technology. Consuming no electrical power and engineered with only one moving part made of highly durable and corrosion-resistant ceramic, the PX Pressure Exchanger offers substantial energy savings and ease of integration resulting in reduced operational expenditures.

The LPT Turbocharger is also a cost-efficient energy recovery solution offering long-term reliability and versatility in a compact footprint, designed for low-pressure applications such as multi-stage brackish reverse osmosis water treatment.

PX Q400

Our most efficient, highest-capacity PX for seawater reverse osmosis desalination facilities.

Building upon Energy Recovery’s track record of best-in-class performance, the PX Q400 is the next evolution of our industry leading PX® Pressure Exchanger® technology. Delivering energy and cost savings, the PX Q400 offers the lowest projected life cycle cost of any energy recovery device (ERD) for seawater reverse osmosis (SWRO) desalination, thanks to high performance and lower maintenance. The PX Q400 further innovates and improves upon what came before—enhancing efficiency, capacity, reliability, and value to ensure it remains the most trusted ERD in desalination.

ACWA Power Rabigh 3 IWP: A Large-Scale Plant Aimed at Energy Efficiency

Approximately 60% of the Kingdom of Saudi Arabia’s water comes from desalination currently – which consumes roughly 20% of the country’s energy usage – and demand is continuously rising. With the decoupling of power and desalination plants, it is now more necessary than ever to make desalination facilities energy efficient, and the government has directed water producers to decrease energy consumption as much as possible.

As one of the biggest seawater reverse osmosis (SWRO) desalination facilities in the world, ACWA Power Rabigh 3 IWP was designed to address the growing demand for water while also keeping energy consumption low.

By utilizing efficient solutions throughout the facility, the designers and engineers were able to reach their goal of reducing power consumption to under 3.2 kWh/m3. Energy Recovery’s PX devices were a key component in achieving the stated goal and, on an annual basis, will save ACWA Power Rabigh 3 IWP approximately 500 GWh each year.

The US’ First Municipal Installation of a BWRO Pressure Exchanger®

The Challenge
Planned Brackish Water Reverse Osmosis (BWRO) facility facing significant drop-off in water quality.

The City of North Point, Florida built a new brackish water reverse osmosis (BWRO) facility capable of producing 2.0 MGD of potable water by treating raw water from local wells with a Total Dissolved Solids (TDS) level of about 3,500 mg/L. However, the facility needed a flexible design because the conditions are expected to change over time. Nearby wells are degrading and the City anticipates that the raw water quality will degrade over time; historical data predicts salinity could increase by as much as 370% in the first 10 years of operations. The facility has two reverse osmosis (RO) skids, each capable of producing 1.0 MGD, which are designed to expand to produce 2.5 MGD each as demand for water rises. This wide range of operating conditions presented a significant design challenge.

The Innovation Solution
The US’ First Installation of a BWRO PX® Pressure Exchanger®

Water Products Catalog

energy recovery devices (ERDs), reducing the energy needs, costs, and emissions associated with reverse osmosis desalination.

Energy Recovery has spent decades perfecting devices that capture and recycle otherwise wasted pressure energy. We have a suite of energy recovery devices (ERDs) that can operate at different pressures, dramatically reducing the energy needs, costs, and emissions associated with reverse osmosis desalination.

Our industry-leading energy recovery solutions include the PX® Pressure Exchanger®, Ultra PX™, and Turbocharger. Combined with our family of pumps, our solutions are trusted around the world by plants of all sizes to meet their specific energy recovery needs.


Energy recovery technologies such as the pressure exchanger (PX), have previously focused on seawater RO applications due to the rather quick payback. This leaves brackish water RO (BWRO) facilities to turbochargers that yield less efficient transfer of energy than their PX counterparts. Recently, the first municipal BRWO application of a PX energy recovery device was designed for the City of North Port, Florida’s Southwest Water Treatment Plant and will be started up in 2nd quarter 2022.

This will be the first Brackish Water municipal installation of the Brackish pressure exchanger within the U.S. This paper will present and discuss the design considerations and key parameters including impacts to RO system operation and water quality, energy saving considerations, and data from the facility startup in 2nd quarter 2022. Municipalities with brackish-water supplies will be shown the way to reduce operating costs and maintain water quality from their RO treatment facility.

PX Powertrain

The PX PowerTrain™ line of pre-engineered energy recovery
solutions combine Energy Recovery’s award-winning PX® Pressure
Exchanger® (PX) devices with frame support and ancillary equipment
into a compact, ready to install high-performance energy recovery
device (ERD) array package for your seawater reverse osmosis
(SWRO) train. Designed by Energy Recovery’s technical experts,
the PX PowerTrain combines optimized flow paths with our core PX
technology to streamline ERD array installation while maintaining
industry-leading quality standards.

PX Q Series

For over 20 years we’ve enhanced our PX technology to meet rapidly evolving customer needs. We’re taking the next step with an expanded PX Q Series, which delivers minimal noise levels alongside the best-in-class performance and efficiency that customers can expect from our flagship PX product line. The Q220, Q180 and Q140 models join the Q300 and Q260 to serve a broader range of plant sizes. With operational sound levels below 79 decibels, the PX Q Series improves the auditory environment while also delivering industry leading uptime and energy savings. Download the one-sheet for more details.


Available in multiple configurations, the PowerPlay raises the bar on SWRO plant performance. Constructed with state-of-the-art technology, each component of the PowerPlay is virtually maintenance free and backed with service from a single, trusted source. Download the one-sheet to learn more.

Animation: How the PX Pressure Exchanger Works

With over 15,000 PX devices installed worldwide, the PX Pressure Exchanger technology sets the standard for excellence in engineering. This game changing technology cuts energy costs by 60% – saving our clients billions of dollars every year and helping to produce over 12 billion liters of fresh water every day. Watch to learn more.

PX Prime Brief

This one-page brief provides an overview of the PX Prime, the best energy recovery solution for desalination, now available risk-free.

PX Prime Teaser

Over two decades, Energy Recovery has earned a leading position in the global water market. Our groundbreaking PX Pressure Exchanger is the most widely used energy recovery device in the world.

The PX Prime is the latest advancement in Energy Recovery’s award winning PX Pressure Exchanger line, and is the most advanced energy recovery device for desalination available on the market. We have engineered the PX Prime to perform with even less fluid mixing and enhancements across a variety of factors. It will also be the first PX available risk-free, with no upfront costs.

Desalination During Drought: Solutions to a Growing Demand for Water

Clean drinking water is fundamental to all life. As 2015 marks the end of the United Nations’ International Decade of Action recognizing water and sanitation as a basic human right, it also marks the beginning of a new era of water supply and usage across the state of California.

Since a statewide drought began four years ago, California lawmakers have struggled to find rainfall-independent solutions. This is not the first time California has turned to desalination as part of a larger plan to tackle decreasing water levels and drought conditions. The multiple-year drought in the 1980s led to the construction and opening of the Charles E. Meyer Desalination Plant in Santa Barbara. When rainfall returned just three months after the plant opened, the facility was mothballed. Forward-thinking experts kept up plant maintenance in the meantime, knowing it would not be the last time such measures would be considered or implemented.

There are also costs and other types of resource usage issues to consider. For instance, much of Southern California’s drinking water travels hundreds of miles from its origin in the Colorado River, transported using a massive and expensive aqueduct and conveyance system. With this current drought comes an opportunity to revisit tabled solutions and better prepare future plans to make desalination part of a larger framework to continue to keep California watered.

Desalination is not a silver bullet. But technology has improved the process and subsequently lowered the cost. Stuart White, director of the Institute for Sustainable Futures in Sydney, Australia, has called the need to plan for future plants “desalination readiness.” In Australia, as in many other arid, desert-like parts of the world, desalination has become a necessary and useful part of a plan to increase water resiliency and drought preparedness. The capacity of large desalination plants is quantified by how many millions of gallons of water per day (MGD) the plant produces, with Sorek, the world’s largest seawater reverse osmosis plant located south of Tel Aviv, producing 165 MGD. The largest desalination plant using membrane technology, which typically uses energy recovery devices such as the PX Pressure Exchanger, is Magtaa in Algeria, with a capacity of 132 MGD.

In the following pages, we’ll consider the success stories of desalination in California coastal cities, in Israel, and in Perth, where desalination helped pull the Australian city back from the brink of disaster during a decades-long drought. We’ll also look at other examples that circle the globe. Spain recycles 17 percent of its effluent, the second highest percentage worldwide after Israel, which treats 86 percent of its wastewater and irrigates more than half its crops with treated effluent. Domestically, states with desert climates, including Texas, are considering adding desalination plants to their resource management portfolio as a way to stay ahead of disaster and move ahead with progressive, affordable technological solutions to an age-old problem.

AquaBold Product Demo

Energy Recovery presents our AquaBold high-pressure pump line. Take a tour with Mechanical Engineer, Alex Theodossiou, as he explains the key features and benefits of one of the highest quality pumps on the market today. With the highest efficiencies, little to no maintenance, and casted metal for higher availability, the AquaBold works seamlessley with our PX Pressure Exchanger or Advanced TurboCharger ERDs.

Advanced TurboCharger Product Demo

Energy Recovery is proud to present our improved Advanced TurboCharger line. Take a tour with Senior Technical Manager, Eric Kadaj, as he explains the key features and benefits of this new and improved centrifugal solution. With patented volute insert technology and solution enhancements, our turbocharger product line is now the most flexible, efficient, and reliable centrifugual Energy Recovery Device (ERD) in the industry today.

Energy Recovery in China

China has been turning to seawater reverse osmosis (SWRO) as a way to ease the severe stress on fresh water resources, and ninety percent of Chinese desalination plants use Energy Recovery’s technology to harness fluid flows and pressure energy. Watch this video to hear experts in the Chinese desalination industry talk about their experience with Energy Recovery over the past ten years.

Chinese version available

Advanced TurboCharger Animation

With Energy Recovery’s Advanced TurboCharger™ (AT) with volute insert technology, plant operators can recover a significant portion of this wasted energy and transfer it back to the seawater reverse osmosis feed stream. This energy recovery device, or ERD, reduces the amount of pressure the high-pressure pump must create — greatly reducing the amount of power that’s needed to produce water. With the Energy Recovery TurboCharger, there is minimal downtime versus days or weeks with other methods. Suitable for both high-pressure seawater and lower-pressure brackish reverse osmosis systems, Energy Recovery TurboChargers offer substantial savings for lower investment solutions — especially in locations where power costs are heavily subsidized or there’s a need to reduce upfront capital costs. The device is easy to install and has a compact footprint. The Energy Recovery TurboCharger is a turnkey solution that requires minimal installation time, operator training and plant design.


面对日益严峻的水资源短缺,中国各水利机构与各大全球水处理公司建立了合作伙伴关系,致力于建造 中国现今最大的反渗透海水淡化厂。美国能量回收公司始终为主要的海水淡化厂提供高效领先的能量回收设备,并 在中国拥有90%的市场占有率,每日供水估约50万立方米。

Turbocharger Energy Analysis

The Turbocharger Energy Analysis tool allows you to quickly and easily calculate the boost provided by the Advanced Turbocharger (AT) in your plant. It is meant to assist you with the preliminary design. Results may vary. Please contact us for your specific design requirements.


English Metric

Turbo. Performance
Energy Rate calculation uses industry standard centrifugal pump efficiencies.

Turbocharger Model / Size:
Permeate Flow:
Pump Discharge Pressure:
Specific Energy Consumption:
In this calculation the assumption for cost of power is 0.08 [$/kWh].
Energy Savings:
Energy Savings assumes an existing pump efficiency of 75%.

Congratulations! Now that you have sized the Turbocharger to your plant, check out our AquaBold HPP Selector to incorporate the Energy Recovery AquaBold into your plant. Go now

Want to learn more? Our global support team can help design an energy saving solution for you today. Contact Us.