Elastic Media | Plastic Elastic Media | Biofilm Carrier Media

Working Principle As wastewater flows past the media, microorganisms attach to the strand surfaces and multiply, gradually forming biofilm. The flow and aeration constantly scour the film, so older biofilm sloughs off while new growth takes over, keeping activity high. The three-dimensional structure keeps redirecting the flow inside the tank, and air bubbles get cut into finer ones, which improves oxygen utilization. The media bed also traps some suspended solids, easing the load on downstream treatment. Application Fields 1.Domestic sewage: municipal wastewater plants and small integrated treatment units. 2.Industrial wastewater: biological treatment for chemical, printing and dyeing, pharmaceutical, and food processing industries. 3.Water reuse: biological contact oxidation in advanced treatment stages. 4.River restoration: in-situ purification and ecological restoration of black-odor water bodies. FAQ Q1: What material is elastic media usually made of? A: Polypropylene and polyethylene are the most common, along with modified polypropylene. PP resists acids and bases and costs less, so it's used the most. PE is more flexible and less likely to snap. The strands sometimes contain anti-aging agents and hydrophilic additives to extend service life and help microorganisms attach more easily. Q2: How is it different from combined media? A: Combined media typically uses plastic rings plus fiber bundles, so it has a stiffer structure and biofilm tends to concentrate on the outer surface. Elastic media has finer, denser strands that spread into a stronger three-dimensional shape, giving it a larger specific surface area and more even biofilm growth. But because the strands are thin, it doesn't handle shock loads as well as combined media—when influent suspended solids are high, the strands can tangle and clump. Q3: What should be watched during installation? A: The media is usually fixed to supports in the tank at set spacing, with both ends tied down firmly so it doesn't come loose under flow. Don't pack it too densely, or flow will be restricted and sludge will build up. Aeration at the bottom needs to be even to avoid dead zones that cause uneven biofilm growth. During inspection, check for broken or tangled strands and deal with any issues promptly.