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Wastewater Ion Exchange (WWIX) Services

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Utilizes ion exchange resin canisters for the removal of dissolved heavy metals from a variety of rinse water and wastewater streams.

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Discontinued product

Utilizes ion exchange resin canisters for the removal of dissolved heavy metals from a variety of rinse water and wastewater streams.

Discontinued product


Utilizes ion exchange resin canisters for the removal of dissolved heavy metals from a variety of rinse water and wastewater streams.

Evoqua Water Technologies Wastewater Ion Exchange (WWIX) services and equipment help customers meet their wastewater handling challenges. Evoqua provides system design, installation, and custom services that treat wastewater contaminated with heavy metals. Zinc, copper, nickel, and chromium are just a few examples of the metals that can be removed to low part per billion levels. Our wastewater treatment systems are designed to meet your discharge requirements, achieve the water quality level needed for reuse and recycling, and minimize the liability associated with on-site storage and handling of chemicals and wastes.


Every Application has Unique Requirements

Each application is examined to determine the system configuration that best meets current and future needs. The system components are selected based upon available manpower, space limitations, access limitation and the specific reuse or discharge quality required. If needs change, our wastewater treatment systems are flexible – we can simply change the media types and/or tank size saving our clients significant capital expense.


What is WWIX Service?

Ion exchange (IX) is a proven and cost-effective technology for removing inorganic contaminants. Evoqua‘s WWIX service utilizes ion exchange resins and other media selected to remove specific ionic contaminants from groundwater, industrial wastewater, and process water for recycle. DOT approved vessels containing the selected resin or media treat your water until the capacity is reached. Once exhausted, the WWIX vessels are removed and replaced with fresh, DOT-compliant vessels and returned to service. Exhausted vessels are returned to our processing facility where the contaminants are removed from the media/resin.

Evoqua owns and operates a fully permitted RCRA facility with the technical expertise and equipment necessary to safely manage regeneration of the spent resins while remaining environmentally compliant. Where practical, the media/resin is recycled for future use. We can accept both non-hazardous and hazardous waste. Your specific requirements are evaluated on an individual basis to determine the system configuration that best meets your current and future needs. The system components are selected based upon your specific reuse or discharge requirements. If your needs change, our wastewater treatment systems are flexible - we can simply change the media types and/or tank size saving you significant capital expense.

When used for reuse/recycle, WWIX reduces the cost of make-up water and provides a proven and flexible treatment solution to meet ever-changing discharge limits. In groundwater remediation applications, WWIX offers an easy, cost-effective and scalable treatment alternative for discharge or re-injection. WWIX service is also an effective treatment choice for the cleanup of retention ponds, cooling loops or spills.​​


Flow Rate, Minimum: gpm
  • 1.0
Flow Rate, Maximum: gpm
  • 500+
Liquid/Vapor Phase
  • Liquid

Wastewater Ion Exchange (WWIX) Frequently Asked Questions (FAQs)

What is wastewater ion exchange?

Wastewater Ion Exchange (WWIX) is a service exchange-based technology using portable tanks of ion exchange (IX) resin or adsorptive media to remove contaminants from wastewater.

How does a service exchange-based treatment system work?

Evoqua’s nationwide service network delivers fresh WWIX tanks to a customer’s facility for use in removing specific targeted contaminants. Once exhausted, the WWIX tanks are removed and replaced with fresh tanks. The exhausted tanks are returned to Evoqua’s RCRA-permitted processing facility where the media is removed, and the tank is refilled for the next use. The spent media is regenerated or recovered while the contaminants themselves are typically recovered off-site.

What contaminants can be removed with WWIX?

Any dissolved, ionic (charged) contaminant can potentially be removed with WWIX technology. Regulated heavy metals, such as arsenic, cadmium, chromium, copper, lead, mercury, nickel, zinc, etc., are well-removed by WWIX technology as are other regulated contaminants such as cyanide, perchlorate, etc. Similarly, the technology can easily remove typically non-regulated ions such as calcium, potassium, sodium, chloride, nitrate, sulfate, etc. to facilitate recovery of the water for reuse.

What types of wastewaters are good candidates for WWIX?

Dilute, metal-bearing (both regulated and non-regulated metals) wastewaters are typically excellent candidates for WWIX treatment. Wastewaters can be treated either to meet discharge regulations for wastewater discharge, or for reuse in the generating process or other compatible processes in the facility.

What if wastewater is too concentrated for WWIX treatment?

WWIX treatment may not be technically or economically feasible for wastewaters with higher concentrations of contaminants. In these cases, Evoqua can supply conventional precipitation treatment equipment for discharge compliance scenarios or reverse osmosis (RO) for water recovery and reuse scenarios. There may also be an opportunity to combine conventional and/or membrane and WWIX technologies to achieve the optimal solution.

Is spent IX media considered hazardous waste?

Spent IX resins and adsorptive media are considered wastewater treatment residuals. Some may be classified as hazardous waste, if they meet the EPA’s definition of a listed (based on generating process) or characteristic (based on certain traits of the spent media itself) hazardous waste, while others may be classified as non-hazardous wastes.

What types of processes or contaminants could result in spent WWIX being considered a hazardous waste?

WWIX media used to treat wastewaters from electroplating, chemical etching, milling and coating operations, as well as a number of related finishing processes such as cleaning or anodizing, may result in spent WWIX media being classified as a “listed” hazardous waste; specifically with hazardous waste codes of F006 or F019.

If a spent WWIX media exhibits, based on analysis, characteristics such as ignitability, corrosivity, reactivity or toxicity (as defined in EPA regulations), the spent WWIX media is considered a “characteristic” hazardous waste. The most common types of characteristic hazardous wastes generated from metal-bearing WWIX treatment are D003 (containing reactive cyanide) and D004-D011 (containing specific metals above an explicit level).

How do I know that WWIX media tanks are exhausted?

Operating WWIX media tanks are monitored in a number of different ways to determine when they are spent. In discharge compliance applications, the specific contaminant(s) are measured before and after the WWIX tanks, and the tanks are switched out when the effluent contaminant concentration meets or exceeds an action level appropriate for the application. In water recovery and reuse applications, the effluent water quality is measured for total dissolved solids (TDS, typically measured via conductivity) or resistivity and tanks are switched out based on the water quality requirement specific to the application.  Carbon tanks are monitored more qualitatively, compared to tanks for metals-removal, as the carbon mainly serves to protect the metals/TDS-removal media from fouling; typically, carbon tanks are changed after a specific time interval as opposed to influent/effluent measurements.

How does Evoqua determine the appropriate WWIX media and lifespan?

Each application is evaluated by reviewing the type of generating process, process conditions (flow rate, daily wastewater volume generated), the desired outcome (discharge compliance or water recovery and reuse) and the contaminants involved; preferably, an initial analysis of a representative wastewater sample is completed. That information is used to determine the most appropriate media for the application and to also estimate the throughput and ultimately the number of WWIX tanks that will be consumed annually.

What happens to spent WWIX media?

The majority of spent IX resins and adsorptive media received by the Evoqua processing facility in Roseville, MN, are either regenerated or sent offsite for recovery. If the IX resins are regenerated, then the regeneration residuals (heavy metal-containing solids) are sent offsite for thermal recovery. Some media, depending on their type or contaminants, may be sent offsite for other disposal options.