The Elastic Three-Dimensional Packing is a high-efficiency, durable biological carrier designed and manufactured by our company for biofilm-based wastewater treatment processes. Composed of highly elastic filaments and a central cord, the packing features uniformly radiating filaments in water, providing microorganisms with an extensive specific surface area and an ideal three-dimensional spatial structure for attachment, growth, and metabolism. This design enhances the stability and efficiency of biological treatment systems, making it a commonly used packing material in processes such as biological contact oxidation.
- Structure and Working Principle
- Core structural composition
The filler is a unitized, hangerable three-dimensional structure, which mainly includes:
- Elastomeric filaments: Core functional components, fabricated through specialized drawing processes from polyolefin materials (e.g., polypropylene [PP]) blended with anti-aging and hydrophilic additives, resulting in monofilaments. These filaments exhibit high elasticity and a certain degree of rigidity, enabling three-dimensional uniform radial dispersion in water.
- Central rope: Serving as the supporting framework, it is typically made of corrosion-resistant synthetic fibers (such as polyester or polypropylene) or plastic ropes. The yarns are mechanically and uniformly secured to the central rope.
- Fixed components: The upper end of the packing is secured to the support or crossbeam above the tank body via simple binding or hooking, while the lower end remains freely suspended in the water.
- Working Principle
After the packing is installed, the water flow and air flow (aeration) cause the elastic filaments to produce slight irregular swaying.
- Biofilm formation and growth: The large specific surface area and modified properties of the filamentous surface facilitate rapid microbial attachment and biofilm formation. The three-dimensional space provides conditions for multi-layered growth of the biofilm.
- Mass transfer and renewal: The oscillation of the filament increases the relative motion between the water and the biofilm, enhancing the mass transfer process and facilitating the diffusion of oxygen and organic matter. Simultaneously, moderate shear force can induce the natural detachment of aged biofilms, promoting membrane renewal and maintaining biological activity.
- The anti-clogging feature: The gaps between the filaments can adjust during oscillation, ensuring the filler maintains excellent self-cleaning and breathability, thereby reducing clogging risks.
- Core Technical Features
- Large specific surface area and high biofilm formation efficiency: The filamentous structure is distributed in a three-dimensional radial pattern, providing a vast surface area for microbial attachment. Moreover, the surface of the filaments is often hydrophilically modified, which may facilitate initial microbial colonization and rapid biofilm formation.
- The space structure is reasonable and the mass transfer effect is good: the three-dimensional structure makes the air, water and biofilm fully contact. The random swing of the filament may reduce the short circuit of water flow and facilitate the diffusion and transfer of dissolved oxygen and pollutants.
- High anti-clogging capability and long service life: The material and structure of the elastic wire strips prevent agglomeration, maintaining a certain degree of porosity even under extensive biofilm growth due to airflow and hydraulic effects. The primary material exhibits stable chemical properties, ensuring a theoretically long service life.
- Easy installation and maintenance with strong adaptability: The modular design requires only the fixation of the upper end during installation, simplifying construction. Minimal maintenance is required later, typically without special cleaning. It demonstrates strong adaptability to variations in pool configurations.
- Outstanding cost-performance ratio: As a mature biological carrier, its specific surface area per unit volume and long-term operational stability demonstrate a well-balanced comprehensive application benefit across various biofilm processes.
- Main technical parameters
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Parameter item
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Description / Reference range example
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filament diameter
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Common specifications: Φ0.35~0.45mm
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filler unit diameter
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Common sizes: Φ150mm, Φ180mm, Φ200mm
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specific theoretical surface area
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The model varies significantly, with a common range of 200 to 310 m²/m³.
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void volume
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Generally high, common range> 95%
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Silk thread material
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Modified polypropylene (PP)
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core cord material
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Tensile fiber rope made of polyester, polypropylene, or PVC/PET materials
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film weight
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The total weight will increase significantly after biofilm formation, and its load must be considered in the design.
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- Typical Application Fields
The filler is mainly used in the wastewater biochemical treatment process which requires the cultivation of attached biofilm:
- Municipal sewage treatment: biological contact oxidation tank in domestic sewage treatment plant, supplementary filler in oxidation ditch, and enhancement carrier in traditional activated sludge process.
- Industrial wastewater treatment: Biological treatment units for organic wastewater in industries such as food, brewing, dyeing, petrochemical, and pharmaceutical.
- Micro-polluted water purification: Ecological restoration projects for rivers, lakes, and other landscape water bodies serve as substrates for biofilm attachment.
- Aquaculture water treatment: As the core biological medium of biofilter in recirculating aquaculture systems.
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