Ultra-High Recovery at Full-Scale: RO and EDR Plants Shipped

Industrial Wastewater Treatment With Advanced Membrane Technologies

October 20th 2021

Saltworks is excited to announce the shipment of two membrane-based industrial wastewater treatment plants. Although electrodialysis reversal (EDR) and reverse osmosis (RO) may be viewed as competing desalination technologies, Saltworks offers both and helps clients navigate the fit case for each. Both plants achieve extreme freshwater recoveries thanks to the advanced technology embedded within them.

Saltworks’ FlexEDR was selected to treat a client’s industrial wastewater effluent containing challenging organics. The mobile plant will be shipped to South America. FlexEDR was chosen after a competitive review against reverse osmosis (RO) due to Flex EDR’s more robust membranes. This reduces pre-treatment requirements and simplifies plant operations for challenging wastewaters. Typically, EDR is most effective at trimming total dissolved solids and reducing pre-treatment requirements. Saltworks also offers a unique selective EDR that acts as a ‘chloride kidney’ on process flows. On the other hand, RO is more effective at bulk removal of almost all constituents and meeting a stricter treated water quality specification.

FlexEDR E150 Stack with Transparent Background
FlexEDR Stack inside plant-1

Photos are of the FlexEDR E150 stacks contained within the plant (left and centre-left), a Saltworks Engineer inspecting one of the plant’s FlexEDR stacks (centre-right), and the project team with the plant behind it (right). 

Saltworks’ XtremeRO was selected for the second plant — designed and built to treat saline water for use in an industrial process. Delivered in two fully modular, fully automated, low footprint skids, the plant uses our sophisticated XtremeRO high pressure reverse osmosis technology and is capable of achieving extraordinarily high recoveries. Higher recovery means less brine waste, reduced liabilities, and more freshwater for re-use by the client. A polish RO was included to meet a high-quality treated water specification.  

Saltworks XtremeRO Plant Vessels
XtremeRO plant RO vessels
XtremeRO and Ultrafiltration Skids with Saltworks Engineers

Photos of the reverse osmosis plant including a close-up, internal view of four XtremeRO reverse osmosis vessels in the reverse osmosis skid (left), the reverse osmosis skid (centre), and the chemical and ultrafiltration pre-treatment skid in the foreground (right). 

A Tale of Two Treatment Technologies

Both EDR and RO remove dissolved salts. Considerations of pretreatment requirements, final treatment goals, membrane health, the total cost of ownership, and risk factors are all important before deciding on one membrane technology platform over the other. Desalination solution providers with expertise in both membrane technologies are well-positioned to help customers navigate solutions, trade-offs, and select the right platform for their needs.


Saltworks’ offers advanced EDR and RO platforms, with industry-leading water recoveries. Our water treatment expertise, pilot fleet, and full-scale production also include thermal and chemical technologies. Reach out to Saltwork’s technical experts to learn more.

About Saltworks

Saltworks Technologies is a leader in the development and delivery of solutions for industrial wastewater treatment and desalination. By working with customers to understand their unique challenges and focusing on continuous innovation, Saltworks’ solutions provide best-in-class performance and reliability on challenging waters. From its headquarters in Richmond, BC, Canada, Saltworks designs, builds, and operates full-scale treatment plants, and offers comprehensive offsite and onsite testing services with its fleet of mobile pilots.

Related Resources

Photo of XtremeRO pilot onsite in SEA

Membrane Pilot Achieves 98% Water Recovery in Southeast Asia

Our ultra-high recovery membrane pilot plant has successfully completed another tour of duty. After arriving in Southeast Asia earlier this year, the plant operated continuously around-the-clock for 90 days, achieving 98% water recovery from a complex, mixed industrial wastewater with high organics and variable water chemistry.

More ...

Get started today

Tell us about your water treatment project.