Pond Bottom Liner for Salt Production
Pond bottom waterproof liner geomembranes play a crucial role in salt production facilities, providing a reliable barrier to prevent seepage and maintain the integrity of salt ponds. These geomembranes, typically made of high-quality materials such as HDPE (High-Density Polyethylene) or PVC (Polyvinyl Chloride), offer excellent waterproofing properties and durability. By lining the bottom of salt production ponds with geomembranes, salt producers can effectively contain brine solutions, prevent groundwater contamination, and optimize salt harvesting processes. The geomembranes can be customized to fit the specific dimensions of salt ponds and are installed using advanced seaming techniques to ensure a secure and seamless waterproofing system. Overall, pond bottom waterproof liner geomembranes are essential components in salt production operations, enhancing efficiency, environmental protection, and overall productivity.
Role of High-Density Polyethylene (HDPE) Geomembranes in Pond and Dam Applications
High-density polyethylene (HDPE) geomembranes play a critical role in pond and dam engineering by ensuring structural stability and functionality through their exceptional physical and chemical properties. Below is a detailed breakdown of their roles and principles:
1. Impermeability (Core Function)
Principle: The dense molecular structure of HDPE membranes results in an extremely low permeability coefficient (typically < ), effectively blocking vertical water seepage.
Applications:
Ponds: Prevent water leakage in aquaculture systems, stabilize water levels, reduce refill requirements, and lower operational costs.
Dams/Reservoirs: Block reservoir water from infiltrating dam structures or foundations, mitigating landslide risks caused by rising phreatic lines.
Contaminant Containment: Isolate hazardous liquids (e.g., in industrial wastewater ponds) from groundwater, protecting ecosystems.
2. Enhancing Structural Stability
Erosion and Deformation Resistance:
HDPE’s high tensile strength (≥25 MPa) and elongation at break (≥700%) allow it to adapt to uneven settlement or frost heave, minimizing crack formation.
In embankment dams, combining HDPE with geotextiles disperses stress and prevents localized collapse due to seepage pressure.
Slope Protection:
Shields slopes from rainwater scouring and wave erosion, reducing soil loss.
3. Chemical Resistance and Durability
Chemical Inertness: Resists acids, alkalis, salts, organic compounds, and microbial attack (pH 1–14), making it ideal for corrosive environments like tailing ponds or landfills.
UV Resistance: Carbon-black-stabilized HDPE (2%–3% carbon content) withstands UV degradation, with a service life exceeding 50 years in exposed conditions.
4. Ease of Installation and Cost Efficiency
Lightweight and Flexibility: Low density (~0.94 g/cm³) simplifies transportation and installation, even on irregular terrains.
Reliable Seaming: Thermal fusion or dual-track welding ensures seam strengths ≥90% of the parent material, guaranteeing continuous impermeability.
Cost Savings: Reduces construction time by over 50% compared to traditional clay liners, with minimal long-term maintenance costs.
5. Environmental and Safety Compliance
Non-Toxic: Certified for potable water (e.g., FDA, NSF standards), ensuring safe use in drinking water reservoirs or aquaculture.
Algae Suppression: Black HDPE membranes inhibit algal growth, reducing eutrophication risks.
6. Adaptability to Extreme Conditions
Temperature Tolerance: Performs reliably in -60°C to 60°C, suitable for permafrost or arid regions.
Soft Soil Reinforcement: Combined with geogrids, stabilizes weak foundations to prevent membrane rupture from ground deformation.
Technical Data:
Mechanical Properties | Properties | Unit | Product Specification | Test Frequency | |||||
Thickness | mm | 0.75 | 1.00 | 1.50 | 2.00 | 2.50 | 3.00 | Per roll | |
Density | g/cc | 0.94 | 90,000kg | ||||||
Tensile Properties yield strength break strength yield elongation break elongation | kN/mkN/m%% | 11 20 12 700 | 15 27 12 700 | 22 40 12 700 | 29 53 12 700 | 37 67 12 700 | 44 80 12 700 | 9,000kg | |
Tear Resistance | N | 93 | 125 | 187 | 249 | 311 | 374 | 20,000kg | |
Puncture Resistance | N | 240 | 320 | 480 | 640 | 800 | 960 | 20,000kg | |
Stress Crack Resistance | hr. | 500hr. | perGRIGM-10 | ||||||
Carbon Black Content | % | 2.0-3.0% | 9,000kg | ||||||
Reference Properties | Oxidative Induction Time （a）Standard OIT （b）High Pressure OIT | min | 100min. 500min. | 90,000kg | |||||
OvenAgingat85Cretainedafter90days （a）Standard OIT-％ （b）High Pressure OIT-％ | % | 55% 80% | per each formulation | ||||||
UV ResistanceHigh Pressure OIT-%retainedafter1600hrs | % | 50% | per each formulation | ||||||
Melt Index，condition190°C／2.16kg | 0.20g/10min | ||||||||
1. Primary Application Areas
Hydraulic Engineering
Reservoirs/Dams: Serve as a core impermeable layer to prevent water leakage into dam structures or foundations, improving water storage efficiency.
Irrigation Canals: Reduce water loss during transportation, enhancing water resource utilization.
Artificial Lakes/Landscape Water Bodies: Maintain stable water levels and prevent ecological damage caused by seepage.
Environmental Engineering
Landfills: Act as liner systems to block leachate contamination of soil and groundwater (commonly using HDPE geomembranes).
Industrial Wastewater Ponds: Prevent leakage of toxic chemicals (e.g., acids, alkalis, heavy metals) to protect surrounding environments.
Contaminated Site Remediation: Isolate polluted soil to halt pollutant migration.
Agriculture and Aquaculture
Aquaculture Ponds: Minimize water seepage, stabilize water quality, and increase fish/shrimp stocking density and yield.
Biogas Digester Sealing: Prevent biogas leakage and improve energy collection efficiency.
Mining and Energy
Tailings Pond Liners: Block heavy metal-laden tailings liquid from contaminating groundwater (corrosion-resistant materials like HDPE are required).
Oil Storage Areas: Serve as secondary containment layers to prevent environmental disasters from fuel leaks.
Transportation and Construction
Tunnel Waterproofing: Used in tunnel linings to prevent groundwater infiltration.
Green Roof Waterproofing: Protect building structures from root penetration and moisture damage.
Non woven bags package:
Customer's company Logo mark can be added.
Packed in woven bags.
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