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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.
The Dystor® system includes two durable membranes. The outer 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.
- 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.
- Geodesic support dome is intended for either primary or secondary digesters with piping or other equipment in them that could interfere with the travel of the inner membrane, which is permanently fixed at the top so that it cannot extend very far into the tank when the system is out of service and deflated.
- Separate gas storage unit mounts 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.
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