Storm tank cleaning systems
Watch the video here: Challenges of Cleaning Storm Tanks
Storm tanks will fill with excess water from the sewage system in the event of heavy rain. This is to prevent sewage from overloading treatment plants. The contaminated water stored in such tanks is then released back into the sewage system when it can better cope. In this way the water treatment systems of cities are not overwhelmed or literally overflowing every time we have rain.
The water stored in storm tanks contains a large number of biological and non biological contaminants. As the water in such tanks may be stored for several days considerable sediment will be left behind. Due to the presence of biologically active contaminants there is a potential for foul smelling and toxic residues to form due to bacterial action. Not only do these residues represent health and safety/pollution concerns if left uncleaned, they will eventually impede the effective operation of the storm tank.
Traditionally, storm tanks are cleaned by eductor systems. These create a swirl as the tank empties which attempts to dislodge residue and debris. Or, a tipping bucket system is used whereby buckets positioned across the top of the tank empty water with force into the tank.
Tipping bucket system
Sometimes, manual cleaning is used. In many cases, however, the cleaning by such systems is not sufficient particularly if a thorough clean to remove all foul smelling residue is required.
Impingement cleaning
The StormBlaster™ impingement cleaning system is an alternative method that ensures the removal of even very tough residues. It is used extensively by water companies across the UK, Ireland and France.
The StormBlaster™ in action
The video below shows a recent installation of the Orbitor Storm Blaster above a Victorian storm tank. The powerful impingement cleaning jet cuts off just below the horizontal line thus protecting the infrastructure around it. Over time the jets cover each inch of the tank below removing all debris and residue.