From the Swiss Blue Community Eawag – Aquatic Research Institute:
Equipping wastewater treatment plants for the future with sludge thickening.
Around 10 years ago, the first wastewater treatment plants in Switzerland began to introduce a new process with thickened activated sludge in the biological treatment stage. By doing so, they intended to increase their capacity without having to expand the clarifiers. An Eawag survey of 10 wastewater treatment plants has now shown that the process is effective, but that its potential is frequently underutilised. Sludge thickening could also help to fulfil the planned legal requirements for nitrogen removal.
