Aerated submerged filters (ASF) are a widely used biological technology for municipal and industrial wastewater treatment. Their main function is to remove organic matter and reduce ammonia through a stable and efficient process. This system is compact, easy to operate, and ideal for upgrading existing plants without major construction work.
In this system, the filter media is fully submerged in wastewater. A layer of microorganisms (biofilm) grows on the media and purifies the water.
The oxygen needed for the process is supplied from the bottom through fine bubble diffusers, such as disc diffusers and tube diffusers, connected to high-efficiency blowers.
The fine bubbles distribute oxygen evenly, allowing the biofilm to work continuously and effectively.
ASF systems effectively remove organic pollutants and ammonia, even under fluctuating loads.
Their compact design makes them suitable for small plants or retrofit projects.
The system is simple to operate and does not require complex equipment.
Fine bubble aeration improves oxygen transfer, helping reduce air demand and energy costs.
Biofilm processes typically generate less excess sludge than activated sludge systems.
Aerated submerged filters are commonly used in:
Municipal wastewater treatment
Food, textile, paper, and chemical industries
Compact or modular treatment plants
Upgrading old plants without expanding infrastructure
Aerated submerged filters offer an excellent combination of efficiency, stability, and low energy consumption. With a well-designed aeration system—using fine bubble disc diffusers, tube diffusers, and high-efficiency blowers—this technology ensures high-quality effluent and reliable performance.
