Not sure what kind of system ...
Published by Mark Milne, Wastewater Superintendent
Not sure what kind of system we are working with here. Unless you are working with an industrial site, I would think flow would be a poor predictor. Gas production in an anaerobic digester is estimated between 0.8 and 1.1 m3/kg of volatile solids destroyed ( 13 and 18 ft3/lb of volatile solids destroyed) (WEF.org). So your production relies on the amount of digestible volatile solids sent to the digester.
Typically at my plant, there are not large changes in the total solids to volatile solids ratio going to the digester, so gas production could be predicted from total solids loading. Our loading is fairly stable. The flow increases won't change the solids loading much as it is usually from I/I or rain. Usually I get more dirt with higher flows which doesn't increase gas production.