Configurations
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 (IFAS) or Fixed-bed Bioreactor (FBBR) system.
AccuFAS® Biological Treatment
Complexities such as stringent discharge limits, space constraints, and regional variations present a growing burden for wastewater treatment plants facing demands to treat greater flows. Brentwood’s AccuFAS 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
Navigate Within Biological Treatment
IFAS
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.
FBBR
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.
System Components
Distribution & Vertical Flow Media
AccuPier® Support System
Media Restraints
Aeration Diffusers
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.
Featured Installations
Stevens, Pennsylvania
Application
A poultry processing plant, which was exceeding its original effluent ammonia limit of 8 mg/L, not only wanted to expand production (increasing discharge by 67%), but also needed to meet an even lower ammonia limit of 4 mg/L. Additional aeration tankage could not be accommodated in the given area and hauling waste did not provide a long-term, cost-effective solution. By retrofitting existing tanks with an AccuFAS system, the plant was able to increase capacity to three times the original design and consistently meet the new ammonia discharge limit.
Coldwater, Michigan
Application
The wastewater treatment facility in Coldwater received tighter seasonal ammonia limits of 2 mg/L from May to November. Compounding this challenge, groundwater levels around the plant limited facility expansion, and upstream industries caused organic shock. AccuFAS was selected as a retrofit solution for the existing solids contact aeration basins. The plant continues to consistently meet ammonia limits and has demonstrated improved resilience under hydraulic shock loads.
Woodmark, Texas
Application
The conventional activated sludge (CAS) plant in Woodmark had reached its design capacity and was having difficulty meeting ammonia discharge limits. By selecting AccuFAS biological filter media, attached growth was able to increase sludge inventory in the basin, and therefore, significantly increase nitrification capacity. Since installation, AccuFAS has consistently met discharge limits and only requires 70% of the CAS system footprint.
Services
Preliminary Process Design
Pilot Testing
Startup & Operations Assistance
Preliminary Process Design
Brentwood combines two modeling methods to accommodate site-specific applications for AccuFAS system design. Our kinetic design models are based on extensive pilot studies and full-scale installations, and accurately predict treatment performance. Our commercial BioWin™ models are constructed based on IWA ASM models and incorporate a sophisticated biofilm module for IFAS. These models are also calibrated specifically for Brentwood’s submerged media systems.
Pilot Testing
Our experienced engineers can develop pilot protocols, size the pilot equipment, and analyze performance data to help our clients optimize system design. Brentwood can supply either skid-mounted pilot units to your site, or we can send our mobile testing lab—equipped with advanced instrumentation and PLC control—to run full, sidestream pilot tests.
Startup & Operations Assistance
Brentwood’s systems and components are engineered not only for performance, but for ease of installation. With a dedicated team of site technicians who have assisted in over 500 installations, you can be assured that the system will run properly, and your employees will be educated and prepared to operate the system. Additionally, Brentwood’s process team is available for consultation throughout the lifetime of the AccuFAS system to provide maintenance advice and to ensure continued performance results.
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