ALMA BHU BAF
Your expert for aerobic biofilm processes
Maksim Neubauer
Head of International Project Development & Water Reuse
References biofiltration systems
Dairy Southern Germany, ALMA BioFil Compact
Vapor water treatment using biofiltration with a capacity of 600m3/d for a dairy in southern Germany. The vapor condensate is produced during the production of whey and lactose powder.
Paper mill, Southern Germany, ALMA BHU BAF
Construction of a third treatment stage for wastewater from paper and corrugated cardboard production with a capacity of 700 m³/h for a leading European manufacturer in southern Germany.
Velenje municipal utilities, Slovenia, ALMA BHU BAF, BIO
Expansion of a municipal wastewater treatment plant with reduction of nitrogen and phosphorus compounds and biofiltration for a total wastewater volume of 18,000 m³/d in Slovenia.
Guangda Water Management, China, ALMA BHU LHPS, BAF, Ozone
A municipal wastewater treatment plant for a wastewater volume of 12,000 m³/d with precipitation/flocculation reactors, biologically activated filtration and ozonation in China.
Biologically Activated Filtration for Compact Post-Treatment and Water Reuse
The ALMA BHU BAF combines aerobic biological wastewater treatment and solids filtration in a single compact process stage. Microorganisms grow as a biofilm on a clay-based filter material. As the water flows through the filter bed, organic compounds—and, depending on the design, nitrogen compounds as well—are biologically degraded.
Pre-treated wastewater
Wastewater or contaminated surface water is evenly distributed across the biologically active filter stage.
Biological degradation in the filter bed
Microorganisms on the growth media break down organic contaminants. At the same time, particulate matter is trapped in the filter bed.
Biologically treated clear water
The treated water can be discharged or subjected to further filtration, disinfection, or water reuse.
Advantages of biologically activated filtration
- Biology and Filtration in a Single Step Organic degradation and solids retention take place within the same filter reactor.
- High biomass concentration The large colonizable surface area of the growth media enables high biological activity within a compact plant footprint.
- Small footprint The compact design is particularly well-suited for expansions at locations with limited available space.
- Flexible Nitrogen Removal Depending on the specific application, nitrification and denitrification can take place in a combined or in separate filter stages.
- Suitable as a tertiary treatment stage The BAF can supplement existing biological treatment systems and improve effluent quality prior to further treatment .
When is the ALMA BHU BAF particularly useful?
- Expansion of Existing Wastewater Treatment Plants For additional biological treatment capacity, without completely rebuilding the existing aeration stage.
- Tertiary wastewater treatment For further reduction of organic pollutants, nitrogen compounds, and suspended solids.
- High hydraulic flow rates For industrial and municipal applications with continuous and large volumes of wastewater.
- Limited space When a traditional expansion with additional aeration and secondary clarification tanks requires too much space.
- Pretreatment for Water Reuse To reduce the biological load on downstream filtration, membrane, or disinfection processes.
For pure COD removal and nitrification, an aerated filter stage may be sufficient. If extensive denitrification is also required, the ALMA BHU BAF can be supplemented with a separate anoxic filter stage, appropriate recirculation flows, and a demand-based carbon dosing system.
Process diagram: ALMA BHU BAF
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Reference photos
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Maksim Neubauer
Head of International Project Development & Water Reuse