Dear Folks , I have run a model with Hydrogen sulfide analysis , after made the analysis i got the result for H2s in and out concentration , my question is : do we have a limit for H2S concentration in sewer pipe line ?? or do we have a code or standard that have limits for H2S concentration ??
is the concentration limit depend on pipe material type , and what is the limit for each pipe material ??Thank you all
There are no standards for hydrogen sulfide in water.
The real problems occur in the air space above the water. Sewer workers occasionally die from breathing the fumes. In the US, there are Occupational Health and Safety rules fro hydrogen sulfide. You can find those standards here.
Thank You MR.Tom , i think the result from sewergems represent the concentration of the Dissolved h2s in water it does not calculate the concentration OF h2s in the AIR above water right ?
The H2S formation in a sewer line depends on the Biochemical Oxygen Demand (BOD) and temperature.
In SewerGEMS you can model the decay of H2S concentration in your sewer line as per known H2S concentration values at inflow along with the BOD loading.
Here is a relevant article on this which can guide you for H2S Modeling;
Modeling septicity / hydrogen sulfide (H2S)
Hope this helps.
Bentley Technical Support