Brentwood Industries, Inc.

- Submerged Fixed Film System



Complexities such as stringent discharge limits, space constraints, and regional variations present a growing burden for plants facing demands to treat greater flows. Brentwood’s AccuFAS FBBR system offers a flexible solution for facilities requiring greater treatment capacity in existing basins, better nitrification with consistent seasonal performance, and biological nutrient removal to meet strict effluent total nitrogen limits. For industrial wastewater applications, such as food and beverage or poultry processing, Brentwood provides high-strength BOD roughing or full treatment.

AccuFAS adds a fixed-growth surface for biomass, optimizing airflow and maximizing contact between the waste stream and biomass. Composed of Brentwood’s structured-sheet, fixed-film media, the system resists plugging, will not wash out, and has zero impact on a plant’s hydraulic profile.

A Fixed Solution

  • Municipal & industrial wastewater applications
  • Flexible treatment capabilities
  • Eliminates the need for moving parts
  • Energy savings over MBBR systems

Brentwood’s engineering team can custom design submerged fixed-film solutions for any application. AccuFAS is configured as either an Integrated Fixed-film/Activated Sludge or Fixed-bed Bioreactor (FBBR) system.



AccuFAS is standardly configured as an FBBR process, combining aeration and structured-sheet media to create an airlift pumping mechanism that not only provides sufficient substrate and oxygen to the biofilm, but also maintains thin film thicknesses.



In addition to increasing treatment capacity, conventional activated sludge facilities can improve and stabilize nitrification by retrofitting existing basins with AccuFAS in an IFAS configuration.


Distribution & Vertical Flow Media

Distribution media minimizes aeration necking and provides even distribution of both liquid and air flow, while vertical flow media recirculates liquid by airlift pumping. When combined, the media evenly distributes liquid and air for continuous mixing and scouring of biofilm.


AccuPier Support System

A pre-engineered support system for structured-sheet media, AccuPier is a lightweight and robust system that includes field-adjustable bases and cut-to-length stanchions to allow for installation in a variety of tank configurations.


Media Restraints

Designed to keep submerged film media in place during operation, restraints are engineered to integrate with AccuPier support components.


Aeration Diffusers

The easily maintained aeration system uses cost-effective diffusers mounted under the media towers to provide a high level of oxygen transfer efficiency and to circulate the wastewater by airlift pumping.

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