If WWTP integrated with biogas plant treats wastewater from 300 000 people, maximum amount of CH_4 that can be produced from biogas CO_2 content is about 13 800 MWh/a. In order to produce that amount of CH_4, 3 MW electrolyser could be used. There is a possibility to save 5700 MWh of natural gas that is used to heat the digester with waste heat from PtG-system. Intermediate H_2 and CO_2 storages can even out the fluctuations of gas sources and maintain constant methanation, but resulting storage sizes might be too large to be feasible.
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