Inärmfermentering
Inärmfermentering is a term that appears to be a misspelling or a very obscure technical term not widely recognized in standard fermentation literature or scientific databases. It is possible it is a localized term, a neologism, or a typo for a more common word.
If the intention was to refer to "in-situ fermentation," this would describe fermentation processes that occur
Alternatively, if "inärmfermentering" is a phonetic approximation, it might relate to "inner fermentation" or "internal fermentation."