Cleaning and overhauling of aerating systems
The deep aerating systems operated at wastewater treatment plants tend to get blocked after a while, because the sludge in the waste water builds up on the membranes. Because of the settled sludge the air blowers need to operate with higher pressure and more energy for introducing the air. Consequently, the air blowers are loaded more extensively (consuming more electrical energy), the membranes get expanded more than necessary, and the operating life of the aerating system becomes much shorter.
Our company is ready to undertake the cleaning of the aerating systems, i.e. the removal of contamination deposited on the rubber membranes of the aerating elements. A high pressure dirt removing head is used for the external intervention, when the sludge layer is removed from top and from the micro perforations of the membranes. For this process the water is to be discharged from the tank, and each aerating head is to be washed separately. The tank in empty condition provides an excellent opportunity for inspecting the pipe network and the condition of the membranes. At that time we are in a position to perform the repair immediately if problems are observed and to free the pipe network from the trapped sludge.
By flushing the aerating system with the use of formic acid it is also possible to remove most of the scale and other deposits from the internal surface of the membranes. For this process it is not necessary to empty the tanks.
A significant pressure differential can be created in the system by the combined use of the two modes of cleaning. The efficiency of the combined mode of cleaning is so high, that the customer regains parameters close to those of a new system, and cleaning with high efficiency could be made again, thus saving lots of energy.
