Ref: communities.bentley.com/.../101859
Hi Tom, I'm using SewerGEMS to model H2S formation on a gravity network. Can you elaborate on your response about how well SewerGEMS can predict H2S formation? What "good quality data" do I need and how much data do I need for proper calibration? Is there some sort of guidelines to check the correctness of the results I'm getting? I'm trying to find a sort of FAQ on this subject. Thanks.
(Posted on behalf of Tom Walski)
Predicting H2S formation is not a very precise science. It is a biologically controlled process and trying to model that is approximate. What SewerGEMS does is try to point out where hydrogen sulfide is likely to occur on average over the long run. Concentrations will vary over time. In cold weather with high flow, the concentration will be less than in hot weather with low flow. Therefore, any grab sample may be well off from the model prediction. Over time, you can average out the samples and should be close to model results. If not, you can adjust reaction rate coefficients. The most basic reference on this is ASCE Manual of Practice 69 "Sulfide in Wastewater Collection and Treatment Systems".
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.