TIBEAN- The deep water aerator
The Wahnbach dam is located near Bonn Siegburg. It was built between 1954 and 1958 and today supplies the Bonn region with 75,000 m³ of drinking water per day. The dam has a capacity of 37,500,000 m³ with a water level of 123 m NN.
The geogenic rock is mainly graywacke which has high concentrations of manganese, that partially dissolves under anaerobic conditions. This causes problems in the subsequent water treatment. For hypolimnic water aeration, a deep water aeration system, the “TIBEAN (deep water aerator)” is located in the lake itself. Compressed air is injected into the riser pipe at 4 bar (g) upstream pressure via diffusers. The rising air transports water from a depth of 40 m and oxygenates it with atmospheric oxygen. Partial degassing takes place in the overhead section. The water is then discharged through the descending pipe to a depth of 15 meters. As the oxygen-enriched water horizon gradually migrates down which results in a steady wetting of the sediment-water contact surface with oxygenated water takes place.
The main purpose of deep water aeration is to transport oxygen as effectively as possible. As a result of the improved oxygen transport at the sediment-water contact zone, manganese re-dissolution from the sediment into the water is largely prevented.
The installations have a volume flow of 2 * 2m³/second.
The main task of the TIBEAN (deep water aerator) in this dam is to transport oxygen and to distribute it as effectively as possible. As a result of the improved oxygen transport , manganese re-dissolution from the sediment into the water is largely prevented.
Polyplan carried out the watercourse survey as well as the detailed design of new optimized tibeans. The design was carried out with the help of our finite element calculation @sea.
Wikipedia about Wahnbach dam