TRIPPLE A SETTLER
Alternating active adsorption
Technology “AAA” enables wastewater treatment plants meet new standards with greater efficiency and capacity. Compared to standard primary settling tanks achieves up to 60% efficiency in the removal of COD and 30% efficiency in the removal of nitrogen and phosphorus, with lower energy requirements. This technology also significantly reduces the consumption of chemicals to the WWTP. Due to the absence of mixers and pumps, it is then easy to operate.
Reducing the load on the biological part of the wastewater treatment plant
Removal of approximately 2/3 COD, 1/3 N and 1/3 P
Improving the energy balance of wastewater treatment plants
Increased efficiency in the use of exhalation tanks
Technology Details:
The system operates with two parallel reservoirs, typically in cycles lasting 1 hour and consisting of five phases: inflow/outflow (30 min), thickening, sludge withdrawal, aeration, and sedimentation. In operation, all phases are controlled by air with the exception of the drain, which depends on the inflow of water.
Aeration is regulated according to the dissolved oxygen content (0.5-1 mg/l as standard), while the sludge withdrawal time is automatically adjusted according to the current concentration of undissolved substances in the tank using online measurement.
The side image describes filling and outflow from AAA-1 during simultaneous sludge withdrawal, aeration and sedimentation in AAA-2.
To integrate the AAA process into an existing wastewater treatment plant, it is possible to use existing tanks of both rectangular and circular shape. In most cases, only the division of existing reservoirs is necessary, thereby creating a separate thickening tank.
The AirLock decanter is designed based on the diving bell principle, which uses a pressurized air cushion to expel water and thus prevent sludge from entering the decanting system during the mixing and aeration process. The photo below shows the top end of the AirLock decanter with an air duct, which ensures the filling and release of the air cushion.
The AirLift system serves to efficiently drain sludge during a short lift phase, usually lasting 2 to 3 minutes, and uses high-pressure suction to trap sludge. This system transfers sludge to the thickener through a collection pipe. Both the AirLift and the aeration system share the same process air source and operate synchronously during the phase when the AirLock decanter is full.
A key element is the distribution piping, which ensures proper wastewater supply and optimal contact for biosorption, which supports fluid flow simulations (CFD) for optimal arrangement of distribution lines, side pipes and openings.
Flow optimization using CFD analysis.
Triple A technology was implemented during the intensification of the Rottenburg WWTP in Germany (46,000 EO). The process has been adequately installed into existing tanks, with the aim of increasing the capacity of the treatment plant. The AAA system was able to remove 66% COD and 43% phosphorus on average and achieved an average total nitrogen elimination rate of 36%, as j shown in the figure.
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Headquarters: Sečská 570, 53821 Slatiňany
Branch: Teplicka 631, 75301 Hranice
