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Biological Aerated Filter

A biological aerated filter (BAF) is an advanced wastewater treatment process used in modern treatment plant systems to remove organic pollutants, suspended solids, and nutrients from water. It combines biological treatment and filtration within a single unit, where microorganisms grow on filter media and break down contaminants as water passes through. In a typical wastewater treatment process, the biological aerated filter operates by introducing oxygen into the filtration system, supporting the activity of aerobic microorganisms. This biological aerated environment allows efficient degradation of organic matter while simultaneously filtering out fine particles. The process helps improve effluent quality before discharge or reuse. Biological aerated filters are widely applied in municipal treatment plant projects, industrial wastewater facilities, and upgrading existing treatment systems. They are suitable for compact plant designs due to their high treatment efficiency and reduced footprint compared to conventional secondary treatment units. The system usually consists of filter media, aeration equipment, and a backwashing mechanism to maintain stable operation. Materials used in construction are selected for durability and long-term resistance to corrosion and chemical exposure, ensuring reliable performance in continuous operation environments. Overall, a biological aerated filter is a compact and efficient solution in wastewater treatment systems, integrating aeration and filtration to support stable water quality improvement in treatment plant applications.

The aerated biological filter technology has been developed based on fully absorbing the advantages of foreign aerated biological filters (BAF).

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Quality Control

The Biological Aerated Filter (BAF) technology is developed based on the advantages of foreign biological aerated filters. BAF has the dual functions of biochemical treatment and filtration, which can simultaneously remove organic matter, nitrogen, phosphorus, and suspended solids from wastewater. The principle of wastewater treatment by the biological aerated filter is the oxidation and decomposition of microorganisms in the biofilm attached to the filter media, the adsorption and retention effects of the filter media and biofilm, the food chain predation effect formed along the flow direction of water, and the nitrification effect in the microenvironment of the biofilm. As filtration progresses, the newly generated biomass on the surface of the filter media increases, and the retained suspended solids (SS) continue to rise. In the initial stage, the head loss in the filter increases slowly. When the accumulation of solid materials reaches a certain level, causing the head loss to reach its limit, the head loss may lead to the breakthrough of SS. At this point, backwashing of the filter is necessary to remove the excess biofilm and SS from the filter bed and restore its treatment capacity.

Biological Aerated Filter