Suspended Ball | Porous Rotating Spherical Media | Biological Suspended Ball Media

Working Principle Suspended balls have a density slightly lower than water. At rest, they sit half-submerged; when aeration is on, they circulate throughout the tank with the flow. Microorganisms attach to the surface and interior of the balls and grow into biofilm, breaking down organic pollutants through metabolism. As the balls tumble, they continuously cut through air bubbles, improving oxygen transfer efficiency. Older biofilm sloughs off automatically under the shear force of the water flow, keeping the biofilm active. Application Fields 1.Domestic sewage: treatment and upgrade of municipal domestic sewage. 2.Petrochemical: biological treatment of oily and chemical wastewater. 3.Light industry and papermaking: treatment of papermaking, printing and dyeing, and leather wastewater. 4.Food and brewing: treatment of food processing, brewing, and sugar refining wastewater. FAQ Q1: Do suspended ball media need to be fixed in place? A: No. You just drop them into the biological tank—no brackets or tying needed. They're usually added at 30%–70% of the tank volume, with screens at the inlet and outlet to keep them from washing out. They work well for retrofit projects or tanks with limited space. Q2: Do suspended balls clog over time? A: They can, but compared with combined media and elastic media, the clogging risk is moderate. The main trouble spots are the sponge or fiber cores inside the balls—if biofilm grows too thick and suspended solids build up, the internal voids get filled. Keeping aeration even and doing periodic high-airflow flushes can slow this down. If a core gets completely clogged, it has to be replaced or cleaned. Q3: How long do suspended balls typically last? A: Three to five years under normal conditions. Polypropylene itself resists acids, alkalis, and aging, but long-term aeration scouring and the repeated attach-and-slough cycle of biofilm gradually wear down the structure. Once the outer shell cracks or the inner core falls apart badly, it's time to replace them in batches.