AAT Abwasser- und AbfalltechnikGmbH
About
AAT Abwasser- und Abfalltechnik GmbH is an Austrian biogas and wastewater technology company based in Wolfurt that designs, manufactures, and commissions anaerobic digestion plants for organic waste processing and heavily polluted wastewater treatment with simultaneous renewable energy recovery. Operating since 1993, AAT has delivered over 130 large-scale plants across 30 countries, with nearly 1,000 installations worldwide using AAT components and process know-how. The company has processed more than 150 different substrate types including food waste, whey, sugar beet, biowaste, stillage, sewage sludge, spent grain, molasses, and press cake. AAT offers six distinct fermenter systems: the Hydraulic Fermenter with forced-flow mixing as its core technology, the Flat Fermenter for height-restricted sites, a conventional CSTR Fermenter, a Dry Fermenter for stackable high-solids substrates, Compact Digestion for small-footprint installations, and a UASB Fermenter for high-rate anaerobic wastewater treatment. The equipment portfolio spans digester agitators (Ruehrwerke), flare systems, double-membrane and dry gas storage, hygienization units, activated carbon filters, desulfurization systems, gravel filters, and condensate traps. AAT provides full project lifecycle delivery from feasibility studies through planning, component supply, assembly, commissioning, biological monitoring, and after-sales support. Their Estonian Tahula reference project features six 3,880 cubic meter fermenters processing 800 tons per day of mixed agricultural waste and producing 1,460 Nm3 per hour of biogas upgraded to biomethane. The company serves waste management operators, agricultural enterprises, and municipal wastewater utilities across Europe and internationally.
Key Products
AAT's flagship forced-flow anaerobic digester using hydraulic mixing without internal moving parts, providing robust digestion of organic substrates with low energy input and high biogas yield.
Low-profile anaerobic digester designed for height-restricted sites or applications requiring a shallow reactor geometry, suitable for agricultural and food waste substrates.
Continuously Stirred Tank Reactor anaerobic digester providing conventional well-mixed digestion for a wide range of organic substrates with reliable biogas production.
Anaerobic digestion system for high-solids stackable substrates that do not require pumpable consistency, processing organic waste in percolation-based dry fermentation.
Space-efficient anaerobic digestion system for small-footprint installations, integrating digestion and gas utilization in a compact configuration for smaller-scale organic waste treatment.
Upflow Anaerobic Sludge Blanket reactor for high-rate anaerobic treatment of heavily polluted industrial wastewater, using granular sludge bed technology for efficient COD removal and biogas production.
Submerged mechanical stirring systems for anaerobic digesters that maintain substrate homogeneity, prevent scum formation, and ensure uniform temperature distribution for optimal biogas production.
Biogas combustion flare systems for safe controlled burning of excess biogas during startup, shutdown, or CHP maintenance, available in various capacities for regulatory compliance.
Complete range of digester accessories including heating systems, insulation, feed and discharge equipment, and instrumentation for reliable anaerobic digester operation.
Double-membrane flexible gas holder systems providing variable-volume biogas storage at constant pressure, integrated into digester roofs or free-standing for buffer storage between biogas production and utilization.
Rigid dry gas storage vessels for biogas buffer capacity when variable-volume membrane storage is not required or space is constrained.
Thermal sanitation systems that heat biowaste substrates to required temperatures and holding times to meet hygiene regulations (e.g., EU Animal By-Products Regulation) before anaerobic digestion.
Adsorption filter systems using activated carbon media for removing siloxanes, volatile organic compounds, and residual H2S from biogas before CHP or upgrading to protect engines and membranes.
Biological and chemical H2S removal systems for biogas desulfurization, protecting downstream CHP engines and gas upgrading equipment from corrosive hydrogen sulfide damage.
Particulate filtration systems using graded gravel media for removing dust and aerosol droplets from biogas streams before further gas treatment stages.
Automatic condensate drainage devices that remove water vapor condensation from biogas piping to prevent moisture accumulation and corrosion in gas utilization equipment.
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