Vejle Spildevand A/S, a water utility in Denmark, centralized its wastewater treatment operations but faced increased hydrogen sulphide (H2S) production in the sewer network, causing issues like odour problems, infrastructure degradation, and safety concerns. To tackle this issue, DHI technologies were used which allowed them to streamline operations, optimize chemical usage, and minimize H2S -related problems, resulting in improved environmental outcomes and staff safety.