Biogas and Bioliquid Ponds Anti-seepage Materials Selection
In biogas engineering, the anti-seepage system of biogas and bioliquid ponds (including anaerobic digestion tanks and storage ponds) is a key component that ensures safety, environmental protection and long-term stable operation. Geosynthetic materials play an essential role in this system.
The anti-seepage system of biogas and bioliquid ponds is a composite liner system made of multiple materials. The main materials include:
(1) HDPE (High-Density Polyethylene) Geomembrane
Characteristics: It has an extremely low permeability coefficient (<10⁻¹² cm/s), excellent chemical stability (resistant to corrosion from organic acids, alcohols, hydrogen sulfide, etc. in biogas and bioliquid), outstanding UV-aging resistance (though it should be covered as soon as possible after installation), and high mechanical strength.
Specifications: Recommended thickness is from 1.0 mm to 2.0 mm, which is determined according to pond depth, pressure and specification requirements.
Function: It serves as the primary anti-seepage layer.
(2) Nonwoven Geotextile
Application positions:
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Lower layer (cushion layer): Placed between the soil base and the HDPE geomembrane.
- Upper layer (protection layer): Placed above the HDPE geomembrane.
Function: The auxiliary protection layer. It mainly provides protection, drainage, filtration and reinforcement.
(3) GCL (Sodium Bentonite Geosynthetic Clay Liner)
Application position: Placed beneath the HDPE geomembrane to form a composite liner with it.
Function: When in contact with water, the bentonite hydrates and swells to form a dense gel-like layer with strong self-healing ability. It serves as the auxiliary anti-seepage layer.
(4) Three-Dimensional Composite Drainage Net
Application position: In biogas ponds, it may be installed beneath the HDPE membrane as a leakage detection layer, or above the membrane to help collect bioliquid and discharge biogas.
Function: It serves as the auxiliary protection and drainage layer. 3D composite drainage net consists of a geonet core bonded with one or two layers of nonwoven geotextile, which can rapidly collect and discharge liquids or gases and reduce the pressure on the anti-seepage layer.
Composite structure reference: (bottom to top):
soil foundation > geotextile > GCL > HDPE geomembrane > geotextile or three-dimensional composite drainage net > overlying structure (such as concrete).
You may also like:
HDPE Geomembrane Textured: https://www.zhonglonggeo.com/zh/hdpe-geomembrane-textured/
Short Fiber Geotextile: https://www.zhonglonggeo.com/zh/short-silk-geotextile/
Three-Dimensional Composite Drainage Net: https://www.zhonglonggeo.com/zh/three-dimensional-composite-drainage-net/
Geosynthetic Clay Liner: https://www.zhonglonggeo.com/zh/three-dimensional-composite-drainage-net/
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