Overview
Biofilm elastic packing media is a three-dimensional biological filler designed for attached-growth wastewater treatment processes. Its brush-like structure consists of radially arranged elastic filaments anchored to a central spine, typically made of corrosion-resistant plastics like polyethylene or polypropylene. The design maximizes surface area (commonly 200-500 m²/m³) for microbial colonization while allowing free movement to prevent clogging. Unlike rigid ceramic or plastic carriers, its elasticity accommodates biomass growth without breakage, making it suitable for high-load industrial wastewater systems.
Physical and Chemical Properties
The filaments exhibit a tensile strength of 15-25 MPa and elongation at break of 300-500%, ensuring long-term flexibility in turbulent conditions. Material density ranges from 0.91-0.96 g/cm³ (PE/PP), providing buoyancy for moving bed reactors. Operating temperature tolerance spans -30°C to 80°C. Chemically, the media resists pH fluctuations (2-12) and common wastewater contaminants like sulfides and hydrocarbons. Surface modifications may include hydrophilic coatings to accelerate biofilm formation. Testing standards typically follow ISO 9001 and HJ/T 246-2006 (China's environmental industry standards).
Main Applications
Primary use is in moving bed biofilm reactors (MBBRs) for municipal and industrial wastewater treatment, including food processing, pharmaceutical, and textile effluents. The elastic design handles fluctuating organic loads (up to 15 kg COD/m³/day) better than fixed media. Secondary applications include aquaculture biofilters where its non-toxic properties support nitrifying bacteria. Some variants integrate activated carbon fibers for combined physical-biological filtration. In sludge digestion tanks, it enhances biomass retention time by 20-40% compared to conventional carriers.
Safety and Storage
Non-hazardous under normal use, but cutting filaments may produce microplastics requiring containment. UV stabilization additives (e.g., carbon black) are recommended for outdoor installations to prevent polymer degradation. Storage should avoid compression exceeding 50 kg/m² to maintain filament alignment. Pre-use disinfection with 0.1% sodium hypochlorite is advised for potable water applications. Spent media disposal follows local plastic waste regulations, with some manufacturers offering recycling programs.
B2B Procurement Guide
Key specifications to verify: filament diameter (0.3-0.8 mm optimal), fill density (30-70% of tank volume), and NSF/ANSI 61 certification for drinking water systems. Bulk orders (≥500 m²) often qualify for 10-15% discounts. Leading manufacturers are concentrated in China (Jiangsu, Shandong provinces), Germany, and the US. Sample testing for biofilm adhesion rate (target >0.5 g VSS/m²/day) is recommended. Delivery typically takes 2-4 weeks for custom configurations. Consider modular designs for easy retrofitting in existing tanks.
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