Evoqua – Dystor® system uses a dome-shaped, engineered membrane system to store biogas, and prevent odors. The Dystor system’s outer membrane remains inflated in a fixed position. The inner membrane moves freely as it stores or releases biogas generated from the anaerobic digestion process. This system can hold up to six times as much gas as conventional steel digester covers, maximizing the energy benefits of the process and providing cost savings. Dystor is more economical to install than steel gas holders and more versatile and more stable than floating covers. Ideal for both primary and secondary digesters, its dome-shaped, engineered membrane system maximizes storage of methane gas and sludge, while also containing odors. Plus, a manufacturer installed system means single-source responsibility.