Why am I seeing twice the methanogenic yield (per gram substrate) at 20 day residence time as opposed to 40 and 30 day?

CSTR using anaerobic mixed culture with coal as the substrate. HRT=SRT. Started at 40 day, dropped to 30 day, and ended on 20 day RT. Looking for other examples where increased growth rate...

14 September 2015 482 7 View