Wastewater that is discharged into the sewage system contains suspended solids that largely consists of cellulose. Cellulose which has its origin in the use of toilet paper. The CADoS technology is designed to separate the cellulose present in the sewage, using a finescreen, and use the screenings for optimisation of the dewatering of sludge. The CADoS principle seeks to significantly reduce chemical use for dewatering, reduce energy and achieve lower sludge disposal costs. Furthermore CADoS leads to higher energy yield from biogas in the sludge digestion.

The CADoS installation is designed by CirTec in close cooperation with Water Authority Noorderzijlvest. Oosterhof Holman from Grijpskerk (NL) built the installation according to this design. With the placement, tightly between the influent building and the selector, and start-up of the installation on September 19, 2014, the first phase of the project at the WWTP Ulrum is completed. A fine piece of work, but only a part of the project. The following movie was made of construction phase of the project to  commissioning.

After commissioning, a consortium consisting of Water Authorities Noorderzijlvest and Friesland, the Groningen University, Center of Expertise Watertechnology, Brightwork and Attero will execute a research programm for 3 years to optimize and validate the technology. Uniqueness of this collaboration is the strength of the ‘golden triangle’, and the fact that these parties cover the entire line of wastewater treatment, speeding up the time from theory to practice.

CADoS won the Water Innovation Award 2014 for the category Clean water

More information about CADoS can be found at  www.cados.nl