The HDPE geomembrane can fully meet the integration of fermentation and gas storage in biogas digesters. The whole oxidation pond is fully enclosed by the anti-seepage material of HDPE geomembrane. The construction is simple, the construction cost is low, the sealing performance is good, and the use time is long. The HDPE geomembrane has strong anti-aging and anti-corrosion properties and good anti-seepage effect.
In order to ensure the anti-seepage effect and service life of the structure, it is recommended to use HDPE geomembrane with thickness more than 0.75 mm.
In order to reduce the weld and construction period, the width of 7 meters or more should be selected. The area of the pond should considering the edge part (1 meter circumference along the side wall), and a residual of 7% is expected. (Anchoring, lap joint and leak repair welding).
After the construction of the biogas slurry pool is completed, water of about 0.8 meters depth shall be injected as early as possible to protect the geomembrane from being exposed to the sun and prolong the service life of the geomembrane.