Zero Liquid Discharge and Minimal Liquid Discharge

Brine Management Solutions

Our innovative brine management solutions maximize your freshwater recovery and minimize waste products, reducing your disposal costs. We can help you to optimize your costs with the correct blend of membrane and evaporator crystallizer solutions to achieve zero liquid discharge.

zld evaporator crystallizer



Evaporators and crystallizers



reverse osmosis RO


positive water




Start With Analysis 

  • Before you invest in equipment, let us provide you with an engineering studywe want to help you reduce total costs and improve reliability.
  • We have solutions that can lower your cost through selective ion removal: avoiding the need for brine management; maximizing upstream membrane recovery, resulting in less brine waste; or using alternative energy sourcessuch as waste heatto improve economics.
  • A rapid upfront analysis can inform your decision pathway, such that you invest your valuable time in the most viable options. 
Minimal liquid discharge zero liquid discharge pfd
Selective ion removal for brine management

Ion Selective Removal

The most cost-effective way to achieve MLD or ZLD is to avoid it all together. If your wastewater challenge is limited to one or two constituents-of-concern, we may be able to target and remove it/them via our IonSelect solutions.


Using a variety of treatment methods, robust real-time sensors, and our expertise, we can avoid the need for more complex and expensive treatment. 

Increase RO System Recovery

The second most cost-effective pathway to MLD or ZLD is through minimize brine volumes with optimized membrane systems. We can help to safely push reverse osmosis (RO) assets to their osmotic potential by measuring and removing scaling ions in real-time. 

Improve the performance of existing or added RO assets by:

  • Maximizing recovery with ScaleSense, our real-time ion-selective scaling ion sensor 
  • Remove scaling ions with BrineRefine—our automated chemical softening system 
  • Removing heavy organics and particulate with our XtremeUF ceramic ultrafiltration system
  • Implementing intelligent self-cleaning, as in our XtremeRO systems

Our XtremeRO product can reach concentrations as high as 130,000 mg/L TDS, as much as twice the concentration achieved by conventional RO systems.

XtremeRO Brine Concentrator MLD
zero liquid discharge brine management

Achieve Zero Liquid Discharge

Concentrate your brine down to minimal liquid or even solid waste with our SaltMaker family of evaporative crystallizers. All are engineered as a complete MLD / ZLD package for corrosion and scale-free operation, automated self-cleaning, low cost site installation, and ease of service. We offer four classes of evaporative crystallizers: 

  • SaltMaker MultiEffect is a four-effect thermal evaporative crystallizer, with built-in heat recycle.
  • SaltMaker AirBreather is a single effect thermal evaporator, with both open or closed to atmosphere options, suited for waste heat or low-cost heat sources (<$5/GJ).
  • SaltMaker VapComp is a forced circulated mechanical vapor compression (MVR), suited for all-electric operation and delivered alongside our premier MVR partner  
  • SaltMaker ChilledCrys is a eutectic chilled crystallizer suited for specific ions pairs with a steep temperature-solubility curve such as sodium sulfate

Comprehensive Solutions

We provide comprehensive solutions so you can treat the toughest wastewaters to MLD or ZLD. We can target ions & treat oily and organic wastewater—and help you to achieve economic ZLD.

SaltMaker Zero Liquid Discharge

MLD & ZLD Applications

  • Agriculture
  • Automotive
  • Brine Management
  • Chemical Extraction
  • Chemical Softening
  • Cooling Tower Blowdown
  • Factory Wastewater
  • Flue Gas Desulfurization
  • Food & Beverage
  • Landfills
  • Lithium Extraction & Refining
  • Microelectronics
  • Mining & Metals
  • Municipal & Wastewater Reuse
  • Oil & Gas
  • Petrochemical & Refining
  • Pharmaceutical
  • Power Generation
  • Pulp & Paper
  • Remediation

MLD & ZLD Related Products




SaltMaker MultiEffect ZLD MLD

A modern, modular, and intelligently automated evaporator-crystallizer that concentrates brine or produces low volume solids for zero liquid discharge. Use waste heat from operations and recycles heat through each of its multiple effects to slash your energy costs.

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airbreather evaporator crystallizer

The first evaporator-crystallizer with no atmospheric contact, important for water with volatile organics. Choose between no liquid water return or clean water that is safe for discharge.


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XtremeRO/NF Brine 


XtremeRO Brine Concentrator MLD

Next-generation water-maker and brine-concentrator based on reverse osmosis that achieves extreme freshwater recoveries, enabling cost-effective brine management and treatment of challenging organic-laden waters including oil & gas produced waters.More …


BrineRefine Chemical Softening System

BrineRefine Chemical Softening System

Smart, compact, modular chemical softening system that reduces costs with precision dosing and built-in solids management. Improves recovery and minimizes fouling risk with intelligent controls that communicate with downstream assets, like RO or evaporators.


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MLD & ZLD Related Resources

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