ARA Schönau is one of the biggest and most modern waste water treatment plants in Switzerland. About 20 million cubic meters of waste water are treated and cleared there annually by means of very modern processes. Quite progressive and state of the art is also the process of sludge treatment at ARA Schönau using the Anammox procedure: by an anaerobic ammonia oxidation the nitrogen containing centrate from the sludge dewatering is pre-treated biologically.
For the new sludge dewatering technique the criteria were cost-efficiency of the decanter centrifuges as well as customer satisfaction of already installed plants.
Hiller dewatering technique succeeded in winning due to cost-efficiency and high performance
Hiller GmbH could win the open invitation of tenders due to very good results at the performance tests, economic viability of the decanter centrifuges as well as the proven customer satisfaction at already installed Hiller plants. In December 2015 Hiller delivered two of their high-performance centrifuges, type DecaPress DP574 to ARA Schönau.
In the meantime the new dewatering technique has been installed and brings optimal results in regards to waste water separation. Hiller was able to meet all deadlines and even exceed the required performance.
Innovation in regards to centrate regulation leads to stable operation process as well as reduction of polymer amounts
An additionally positive effect on cost-efficiency has the installation of the patented Hiller Centrate Control. This is a newly developed system which ensures a continuous optical monitoring of a pre-selected centrate quality. It is also able to automatically regulate the polymer consumption in order to achieve optimal results and save polymer amounts. By means of this innovative system it is no longer necessary to operate the plant with higher amounts of polymer at weekends or holidays because of safety reasons.