Gas Supply Systems for Water and Wastewater Treatment

Chart provides complete equipment gas storage and delivery solutions for oxygen enrichment and pH balancing processes used in the treatment of water and wastewater.



Proven track record of working with end-users, municipalities, water treatment specialists, mechanical and engineering contractors, and the gas companies.

Automated turnkey oxygen solutions including consulting, system design, manufacturing, installation, commissioning, training, and ongoing maintenance programs.    

Principal system components, including cryogenic storage tanks, vaporizers, and vacuum insulated piping (VIP), are designed and built in-house and configured as complete tailored solutions incorporating system automation and pressure control stations.

Chart oxygen system for water treatment

Aeration is used in medium and high volume municipal and industrial water and wastewater treatment applications where it is key in the activated sludge process. It is a safe and natural process that avoids chemical treatments and instead stimulates naturally occurring micro-organisms to degrade contaminants. 

Using pure oxygen instead of air for aeration significantly increases oxygen mass transfer and saturation, which leads to smaller installations, greater efficiencies and reduced power requirements.

Other processes where a Chart liquid oxygen system yields improved efficiencies and cost reductions include:

  • Ozone Disinfection - the vaporization of liquid oxygen generates ozone
  • Hypolimnetic Aeration – process of raising oxygen levels in deep lakes or reservoirs 
  • Supersaturated Dissolved Oxygen – replaces the need for hydrogen peroxide chemicals

Combining Chart equipment and BlueInGreen technology enables us to provide complete water treatment solutions through efficient delivery of dissolved oxygen, carbon dioxide and ozone.

Chart CO2 water treatment plant for pH balancing

Using COfor pH balancing improves site safety, minimizes environmental exposure, improves efficiency and reduces costs.

Simple and safe, liquid carbon dioxide is stored on-site in a Chart tank before being vaporized into a gas and injected into the water. All principal capital equipment comprising storage tanks, vaporizer and inter-connecting pipework, is engineered and built in-house and supplied as a turn-key package including associated controls and instrumentation.

Chart pioneered the distribution and storage of bulk carbon dioxide as a cost effective and safer alternative to high pressure cylinders and we forged our reputation developing systems for the world’s largest restaurant chains. We've applied the same technology to other applications, including pH balancing at municipal swimming pools, and water treatment plants where carbon dioxide is a safer and more economical solution to sulfuric and other strong acids in pH control.  

Benefits of a Chart CO2 system:

  • Reduces high pH levels quickly
  • Lower capital cost versus equivalent acid system
  • Customized around a facility’s specific requirements
  • Quick and easy installation
  • Proven reliability
  • Full automation eliminates handling of hazardous chemicals
  • Reduced monitoring costs

Compared to sulfuric and other acid/chemical treatments, carbon dioxide:

  • Is non-corrosive to pipes and equipment
  • Is a significantly cheaper commodity
  • Provides significantly reduced risk to the health, safety and well-being of employees
  • Provides significantly reduced risk to the surrounding environment

Chart acquisition of BlueInGreen, LLC

BlueInGreen logo

The combination of Chart equipment and BlueInGreen (BIG) technology provides solutions that efficiently deliver dissolved oxygen, carbon dioxide and ozone for water treatment. Chart and BlueInGreen, LLC have long worked together, as our cryogenic storage and vaporization equipment provides the feed gas to BIG’s technology. BIG’s core, gas-dissolution technology uses a common set of components and methods to serve a variety of applications in municipal and industrial end markets. Not only does this technology consume 20% to 40% less gas than other alternatives for the same level of treatment, it delivers the solution with the smallest energy, carbon and physical footprint.

To learn more about BlueinGreen visit their website at

Chart is a member of water treatment associations

Learn more about Chart's gas solutions for the water treatment industry



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