Danish water utility Aarhus Vand worried that high levels of hydrogen sulfide (H₂S) in the wastewater collection system in the village of Solbjerg were causing its sewer network to deteriorate at a faster rate than expected. Without a clear overview, the utility was unable to uncover the cause, magnitude or development of the issue.

In a joint effort, the company SulfiLogger installed 15 liquid-phase SulfiLoggerTM H₂S sensors measuring directly in the untreated sewage in strategic locations in manholes and discharge wells throughout the village. Connected to a cloud solution, all 15 sensors provided online H₂S data in real time giving Aarhus Vand a reliable and dynamic overview of the situation in the entire village. Data showed that while the daily variations in H₂S remained similar, the magnitude of the daily H₂S peaks in a discharge well at the end of a force main from a nearby village varied significantly between 2 and 4 mg/L.

With solid data confirming Aarhus Vand’s own suspicions of high H₂S levels being transported to the nearby village of Tranbjerg, the utility decided to install a newly-developed filter from Sulfinizer effectively eliminating the problem. The Sulfinizer filter system is a sustainable solution based on mussels’ shells which converts H₂S into poorly soluble and unproblematic plaster.