Rental aerator for a municipal wastewater treatment plant with 3,900 P.E.
At a municipal wastewater treatment plant with 3900 P.E. in Lower Saxony, the membrane pressure aeration of the activated sludge was to be completely replaced at the end of its lifecycle. The energy, maintenance and investment costs of different systems were compared.
The lowest annual costs came up for 2 floating ATB surface aerators of type HSA with 11 kW each. As the conversion of the system was associated with considerable costs, the customer first wanted to verify the calculated values in practice and therefore opted for the hire-purchase option. After successful trial operation over a period of several months, the devices were purchased with proportionate crediting of the lease.
Rental aerator for a leachate pretreatment on a large landfill site
A leachate storage tank with 20,000 m3 on a large landfill in North Rhine-Westphalia caused problems for the landfill operator. Anaerobic degradation processes regularly led to strong acidification of the stored leachate in connection with very strong odour nuisance in a neighbouring recreation area.
After comparing different aeration systems, the operator decided to install a 55 kW HSA surface aerator for test purposes. The effect of the rented aerator on COD degradation and odour prevention was observed over several months. The test was judged successful and the aerator was purchased for permanent operation.
Rental aerator for rainwater treatment in a biogas plant
The transport routes on biogas plants are heavily contaminated with organic material due to the transport and storage of silage. These deposits are flushed out during rain events and in many cases mix with the silage leachate, which is difficult to manage separately. This highly polluted rainwater is collected in most biogas plants in storage tanks and then spread agriculturally.
The operator of a biogas plant in Schleswig-Holstein had set himself the goal of reducing the organic load and odour pollution during agricultural utilisation as much as possible by aerating the collection tank. Two floating surface aerators with 5.5 kW each were installed as rental units in the existing collection tank. During the test period of 6 months, the desired targets were achieved from the operator's point of view and the aerators were taken over into the ownership of the biogas plant.