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Every project is unique and requires a customised solution. We develop and build plants that are perfectly tailored to your requirements and demonstrate our leadership by combining proven processes with innovative technologies.

Wastewater treatment

Whether reconstruction, extension, renovation or a newlyto erect sewage plant – we surely have a suitable solution. Thanks to engineering knowhow and professional competence, we are able to realize cost-efficient and high-quality products. Our wastewater treatment plants meet the latest technological and regulatory requirements and are tailor-made to comply with our customers’ every wish.

Operational Optimization

Mit unserem interdisziplinären Team überprüfen wir den Betrieb und unterstützen mit unserer Beratung. Zu unseren Aufgaben gehört es, Schwachstellen zu erkennen. Wir verbessern die Anlagen in Bezug auf Bedienungsfreundlichkeit, Personen- und Anlagensicherheit, Betriebssicherheit, Redundanz und Ökonomie. Dabei bieten wir sämtliche Dienstleistungen von der Bilanzierung, Simulation bis hin zur Umsetzung und Erfolgskontrolle der vorgeschlagenen Massnahmen.

Operation and maintenance

On behalf of local governments, we operate and maintain municipal wastewater treatment plants or support their staff with our expertise, thus freeing the proprietors from all technical and managerial burdens. Partnership is essential and our well-trained, specialized staff operates the plants in goal-directed ways. We guarantee to comply with specified cleaning demands and discharge regulations.

Sludge treatment

We identify environmentally adequate and cost-efficient ways of sludge disposal. We project all the steps to be taken, from extraction, dewatering and drying to combustion. We also develop regional and supraregional sludge logistics and disposal concepts.

Process engineering

In the treatment of municipal wastewater, demanding processes and technologies are being applied. Our in-depth expertise in both established and innovative processes puts us in a strong position to offer future-oriented and effective solutions. With the aid of computer-based dimensioning and simulation calculation, we assess critical operating and loading conditions and generate important findings for best possible applications.

selected references

Waste Management and Recycling Zurich (erz), Zurich-Werdhölzli
Largest plant in Switzerland for the elimination of micropollutants with ozonation and sand filter (Q dim = 6,500 l / s)


WWTP Basel, Basel
Renewal and extension of WWTP, elimination of micropollutants and BIM planning

Wastewater Associations Altenrhein, Thal
Elimination of micropollutants with ozonation and filtration with granulated activated carbon


WWTP Flos, Wetzikon
Elimination of micropollutants with powdered activated carbon direct dosing into the biology tanks

WWTP Oberes Wynental, Reinach
Expansion and rehabilitation, elimination of micropollutants by ozonation


WWTP Vidy, Lausanne
Renewal and extension of WWTP, elimination of micropollutants


WWTP Birs, Birsfelden
Renewal and extension of the WWTP with sequencing batch reactor

your contact

Reto von Schulthess
Head of Wastewater Technology
+41 41 368 99 39


David Salzgeber
Dep. Head of Wastewater Technology
+41 31 370 30 11


Dr. Michael Mattle
Dep. Head of Wastewater Technology
+41 21 654 91 21



Dynamic Simulation Software