AAT Abwasser- und Abfalltechnik GmbH products

The AAT system creates optimal process and mixing conditions for anaerobic degradation of organic matter without moving parts placed inside the digester and without external mixing energy.

Digester dimensions: low height to diameter ratio. Mixing technology: AAT vertical agitator combined with propeller mixer. Feeding: direct solids feeding. Heating: heating register integrated in digester. Desulphurisation: integrated biological desulfurisation or external microbiological desulfurisation.

Build from prefabricated, enamelled, epoxy-coated steel segments or from concrete. Fully mixed with AAT agitator. Short construction time. Use in systems from 250 m³ to 9,000 m³. Permanently corrosion-resistant. Epoxy-coated or glass-enamelled with stainless steel roof. Concrete with PE protective film.

The AAT package plant digestion combines the sludge digestion and the gas storage in a simple and maintenance-free system.

UASB or EGSB digesters use gas separators and overflow weirs in the upper digester section to remove the biogas from the digester and retain the biomass in the digester.

The AAT submersible mixer is used to mix fluids and sludge in basins and tanks. The directly driven submersible mixers with three-wing propellers ensure optimised mixing of the tank contents. Additionaly, a heigh adjustment is used to mix up floating and suspended layers. On account of the construction for permanent submersed operation, the mixers have an especially long life.

The AAT gas hood with the diameters of 1200 - 3000 mm is a cover on the roof of the digester. It is used as an access and removal opening during maintenance work and offers a compact platform for the installation of gas components.

The AAT view ports are used to look inside various tanks, digester and shafts in biogas plants. By means of the view port, the contents, the fermentation, the function of the agitators and similar things can be controlled optically.

The AAT access opening is used for easy and direct access to the concrete tank for reconstruction or maintenance work. The frame is adapted individually to the tank diameter and the wall thickness.

AAT microbial desulphurization is used to reduce hydrogen sulphide in biogas, WWTP and landfill plants on an ecological basis. Apart from methane and carbon dioxide, toxic hydrogen sulphide is produced in fermentation process as well. This acts corrosively on the consumers and equipment.