In both cases, it was possible to achieve a full, dynamic overview of how H2S impacted the plants. These insights enable future H2S mitigation activities to be started on a fully informed basis. To track the root cause of the issues, the operators could also initiate further measurement campaigns upstream in the collection system.
At the Saint-Nazaire plant, Klearios gained insights into the plant’s combined inlet (blue), which showed regular patterns with varying daily peaks between 0.2 and 1.0 mg/L H2S.
At the Cassis plant, two different H2S profiles were observed from two influent sources. The H2S profile from the pressurized system (blue) followed a predictable pattern with consistently low H2S levels below 0.4 mg/L, while a different profile was observed at the gravitational line (red), where frequent and irregular spikes above 5 mg/L were observed. The flow rate was significantly lower than in the pressurized line, indicating that the effect of the spikes would be less visible on the plant’s combined inlet.
H2S remains an unknown, dangerous, and expensive parameter at the WWTP. Although WWTP operators possess all the tools and techniques needed to mitigate the unwanted gas, readily available data is needed to optimize the effectiveness of the chosen H2S mitigation activities.
The SulfiLogger™ H2S sensor delivers this knowledge by providing a true, reliable and dynamic overview of how H2S impacts the WWTP.