Positive Pressure Anaerobic Digester Cover

Floating Covers

Project Summary

Layfield installed four anaerobic digester lagoons to treat agricultural wastewater in the Central Valley region of California. These positive pressure designed digester covers averaged 215,000 ft2 (20,000 m2) in size. The project scope included installing a double-lined system, piping including inlet, outlet, sludge removal, leak detection, perimeter gas collection piping, mechanical mixers, and baffle curtains.


Based on the project specifications, a Biogas Floating cover with a positive pressure design was chosen and installed. These types of covers are increasingly popular with Food processors, integrated growers, and intensive livestock producers as a viable treatment method for agricultural wastewater treatment.

In addition, these digesters provide an essential sustainable solution for reducing carbon in our environment. The methane these digesters produce is an important alternative energy source and can produce biomethane fuels and electricity generation for utilities, producers, and consumers.


After completing the double liner system, the lagoons were filled, and an 80 mil (2.00 mm) HDPE cover was welded in sections on-site and then floated into place. Testing of the agricultural wastewater liner systems included using Layfield’s Vacuum Acoustic Leak Identification method (VALID), developed explicitly for double-lined systems. The VALID system simultaneously tests the primary and secondary liners using a single survey. Layfield also manufactured the geomembrane and geonet products utilized.


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