Sewage Treatment Pond Geomembrane

Unlike standard geomembranes used for fish ponds or landscape pools—which are typically suitable only for neutral fresh water—Tongfu’s Sewage Treatment Pond Geomembrane is engineered to resist the combined corrosive effects of organic acids, heavy metal salts, and anaerobic microorganisms found in sewage. It features a specialized formulation with high concentrations of chemical-resistant additives and undergoes rigorous factory-floor acid/alkali immersion testing. It is purpose-built for the harsh conditions of sewage ponds—characterized by long-term containment, high hydrostatic pressure, and strong corrosivity—ensuring compliance with project acceptance standards and a service life of 15–20 years.

Product Introduction

The Sewage Treatment Pond Geomembrane is a heavy-duty, anti-seepage, and anti-corrosion material developed specifically for sewage environments, corrosive water bodies, and industrial wastewater treatment applications. Unlike lightweight geomembranes used for landscaping or aquaculture, this product is manufactured via high-temperature extrusion using 100% virgin high-density polyethylene (HDPE) resin—with no recycled content. The resulting membrane features a dense molecular structure free from hidden pinholes or "sand holes," structurally eliminating the risk of microscopic seepage.

Key applications include municipal sewage biochemical tanks, sedimentation tanks, industrial wastewater equalization tanks, tailings leaching ponds, emergency collection tanks for aquaculture wastewater, and landfill leachate equalization tanks. Its primary function is to provide a barrier against vertical sewage seepage and lateral capillary infiltration through tank walls, thereby preventing contamination of surrounding farmland and shallow groundwater. Simultaneously, it protects reinforced concrete structures from corrosion and spalling caused by acidic or alkaline sewage, making it an essential material for environmental water pollution control.

Core Raw Material Composition

The product utilizes virgin HDPE resin from Sinopec. The melt flow rate is strictly controlled to within 0.35 g/10 min to ensure superior long-term creep resistance. Targeted Additive Formulation: Formulated with high concentrations of hindered phenol antioxidants, outdoor-grade UV stabilizers, and organic acid-base neutralizing anti-corrosion agents. The dosage of these three additives exceeds that of standard freshwater-grade geomembranes by over 30%, effectively eliminating issues common in low-cost market products—such as the omission of anti-corrosion agents or the use of recycled materials. Each raw material batch comes with an original manufacturer's quality inspection certificate.

Production Process

The geomembrane is manufactured using an integrated high-temperature twin-screw extrusion and calendering process, distinguishing it from single-layer blown film methods. Sewage Treatment Pond Geomembrane maintains a thickness tolerance of ≤±0.05mm in both transverse and longitudinal directions. Continuous online infrared pinhole detection ensures the rejection of defective products containing micro-pinholes. The integrated structure eliminates the risk of interlayer delamination; the material does not peel or separate during long-term sewage immersion. Superior molecular fusion during hot-melt welding ensures seam peel strength meets the Grade I requirements of national standards.

Material Properties

HDPE is a non-polar, chemically inert material that does not react with organic acids, strong alkalis, mineral oils, ammonia nitrogen, or sulfides. It withstands long-term immersion in high-salinity and high-COD sewage and resists corrosion caused by anaerobic microbial decomposition at the pond bottom. In year-round submerged, sealed environments, it does not undergo hydrolysis, embrittlement, or deformation, nor is it affected by seasonal pH fluctuations in the sewage. It is suitable for both open-air and underground sealed sewage ponds across diverse geographic regions.

Environmental Attributes

The geomembrane contains no heavy-metal stabilizers or phthalate plasticizers; third-party leaching toxicity tests confirm compliance with the GB 18598 standard for pollution control in landfills. The membrane does not leach trace organic compounds into the sewage, alter water quality parameters, or interfere with downstream biochemical treatment processes. It ensures smooth environmental acceptance upon project completion and poses no risk of secondary pollution.

Core Product Selling Points

1. Multi-faceted Corrosion Resistance

Formulated with specialized additives for acid/alkali resistance, oil resistance, and hydrogen sulfide resistance, the membrane stably withstands extreme pH levels (pH 2–12). It resists combined corrosive factors, including high salinity, anaerobic microorganisms, and industrial oil contamination. Long-term sewage immersion causes no chalking, blistering, or perforation, making it suitable for diverse sewage applications, including chemical processing, tailings management, and leachate containment.

2. Dense Structure with Zero Seepage

Manufactured via a monolithic molding process, the material is free of microscopic pinholes and meets national standards for permeability. It effectively blocks the capillary downward migration of pollutants—such as heavy metals and ammonia nitrogen—preventing secondary contamination of soil and groundwater, and satisfying the strict impermeability acceptance criteria set by environmental authorities.

3. Deformation and Puncture Resistance

With high elongation at break, the material accommodates uneven settlement in the soft, low-lying foundations typical of sewage ponds, preventing stress cracking. It also withstands punctures from sharp concrete edges and crushed stone, making it suitable for the rough substrate surfaces found on construction sites.

4. Long-lasting Durability

It offers dual-performance capabilities: UV resistance for outdoor exposure and resistance to reductive corrosion within enclosed tank environments. It boasts a service life of 15–20 years under standard sewage operating conditions, eliminating the need for extensive mid-term repairs and significantly reducing long-term renovation costs.

5. Lower Construction and O&M Costs

Wide-format rolls reduce the number of on-site weld seams (potential leakage points), while the double-track hot-melt welding process ensures a high pass rate. The membrane surface resists sludge adhesion, facilitating convenient annual mechanical desilting and reducing manual maintenance expenses.

6. Eco-friendly Virgin Material (No Secondary Pollution)

This sewage treatment pond geomembrane is manufactured using 100% virgin HDPE resin. It does not leach heavy metals or harmful plasticizers and remains chemically inert when exposed to sewage treatment agents. All leaching parameters comply with regulations, ensuring smooth passage of environmental protection inspections upon project completion.

Why Choose Tongfu?

1. Dedicated Production Line for Sewage Membranes

Tongfu operates a dedicated, dust-free production line specifically for industrial anti-corrosion and impermeable membranes. Production is segregated from that of geomembranes for fish ponds or landscape pools to prevent raw material cross-contamination. The line features in-line monitoring for acid/alkali durability, with membrane anti-corrosion performance sampled and tested every two hours to guarantee that standard freshwater membranes are never mislabeled or shipped as sewage-grade membranes.

2. Comprehensive Project Inspection Support

We provide a full suite of documentation required for national standard compliance and project approval, including factory certificates of conformity, mechanical property test reports, acid/alkali immersion reports, and third-party SGS leaching reports. We support random re-inspection sampling by project supervisors and offer free assistance to clients in organizing documentation for environmental impact assessments and final project acceptance.

3. Large-Format Stock Availability

We maintain ready stock of 2.0mm and 2.5mm geomembranes—specifications frequently used in sewage applications. To address complex areas such as internal and external corners, inlet/outlet pipe penetrations, and expansion joints, we offer factory-prefabricated curved corner pieces and precision-cut pipe boots. This eliminates the need for on-site trimming or welding, thereby reducing the risk of leakage.

4. Specialized Technical Guidance for Sewage Projects

Unlike standard installation guides, we provide a comprehensive suite of specialized solutions—covering slope anchoring, curved corner detailing, leak-proof pipe penetration sealing, and weld flaw detection—specifically designed to resolve common leakage issues found in sewage treatment projects.

FAQ

1. Can fish pond HDPE liners be used instead of sewage pond liners?

No. Fish pond liners are designed only for neutral water (pH 6–9) and lack the additives required to withstand hydrogen sulfide or oily contaminants. If exposed to industrial sewage, they will corrode and perforate within 1–2 years, failing to meet environmental compliance standards; the material formulations and factory testing protocols for the two types are completely different.

2. Will the liner crack in the low temperatures of an outdoor sewage pond during winter?

Our sewage treatment pond geomembrane is rated for low-temperature performance down to -40°C. Even amidst frozen ground and structural deformation caused by frost heave in northern winters, the membrane retains its ductility and resists brittle cracking, making it suitable for outdoor sewage facilities in cold regions.

3. How are weld leaks repaired?

Minor air leaks in welds are repaired using a heat-fused patch made of the same material. Large areas of incomplete fusion (cold welds) require cutting out the original weld and re-welding. Repairs must undergo vacuum testing; they cannot simply be covered with soil or backfill.

4. Will the membrane leach harmful substances when immersed in sewage?

No. All batches pass groundwater leaching tests; there is no leaching of heavy metals or plasticizers, and the material does not contaminate underlying soil or groundwater, fully complying with environmental regulations regarding sewage containment.