Odour removal at sewage treatment plants
Sewage treatment plants often have problems with unpleasant odours coming from the open basins and sludge tanks, where the waste water is treated. The odour can be described as strong smell of drainage and rotten eggs, but it can be removed efficiently in a BBK-biofilter. The basins and tanks must be covered, so the foul air can be captured and treated in the BBK filter.
BBK can offer the covers as well as supplying the filtermedia.
Middelfart Centralrenseanlæg (municipal WWTP)
On this sewage treatment plant the BBK filter is made in a quadrangular concrete element tank with a technical room in one end, where the fan, heater, electrical switchboard etc. is placed (see picture) and filter media in the other end, divided by a partition wall. The BBK filter treats air coming from a 100 m2 grit and grease trap (3 basins). This is a total amount of 1000 m3 air per hour. The concrete element tank has been covered with steel plates in a suitable colour, so that the filter building suits the existing buildings and surroundings.
The basin cover can be made of extruded polystyrene plates (XPS) with a 1,4mm fibre glass layer on each side. These plates are mounted on a self bearing steel construction, which is fastened to the concrete basin. (see pictures)
This construction has the advantage that every plate can be removed separately, if this is necessary on account of inspection or repairs. The plates have very good insulating abilities and minimum moisture absorption and they are so light that 2 persons can easily lift them without any help from cranes or other remedies.
Sewage treatment plant in Split, Croatia.