Dystor® Digester Gas Holder Systems

The Dystor® system is a digester gas holder design that uses a dome-shaped, engineered membrane system to store methane gas, provide for sludge storage and prevent odors.

Dystor Gas Holder
The Dystor® system includes two durable membranes.  The outer membrane is cable restrained and remains inflated in a fixed position.  The inner membrane moves freely as it stores or releases gas generated from the anaerobic digestion process.  A preset operating pressure is continuously maintained between the two membranes.  This system can hold up to three times as much gas as conventional digester covers and consequently maximizes the energy benefits of the process, as well as the cost savings.

Since the system is manufacturer installed, customers are provided a single point contact for all coordination, service and support. This results in shorter online start up times and lower cost.

With over 24 years experience in the design, manufacture and installation of Dystor® systems, customers can be assured of a gas storage solution that provides the highest return on investment of any digester available.

Watch Our Video to Learn More

Siemens Video






Features and Benefits

  • Free membrane cover is designed for secondary digesters or anaerobic sludge storage tanks.  It provides the greatest volume of air chamber displacement for gas storage and sludge variation.
  • Separate gas storage units mount directly on a concrete foundation ring.  It is employed when only gas storage is desired and is substantially less costly than a high pressure gas storage sphere and does not require the use of compressors.
  • High gas take off is designed for active primary digesters which have the potential for foaming.  The high location of the gas take-off makes it difficult for the foam to reach the gas piping. 


  Click here to view a narrated presentation on the benefits of Dystor Gas Holders

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Argun Erdogan
Product Manager
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Product Documentation

Dystor® Gas Holder Systems

Related Products and Programs

The Crown® Disintegration System increases the gas yield from the anaerobic digester by as much as 30%. 
Digester Retrofit Program - Evoqua Water Technologies offers a complete Digester Retrofit Program, designed to address everything from simple repairs and upgrades to complete replacements.

Featured Case Studies

Dystor® Installation Increases Gas Storage Capacity, Resulting in Significant Cost Savings for the City of Eau Claire, WI. 


Target Zero - Treatment Plant Operator, March 2011
Worth the Wait - Treatment Plant Operator, Jan. 2011
Achieving Net Zero Energy - World Water, Jan. 2011
Getting the Most Out of Your Biosolids - Government Engineering, Sept. 2009
Digester Gas Holder Mitigates Potential Risks - World Water, Sept. 2007
Cover System Helps Store Biogas for On-Site Applications - WaterWorld, June 2007 
Digester Gas Provides Savings - Pollution Engineering, March 2006