English translation: sludge humification / sewage sludge humification
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Explanation: Sewage sludge can be treated by drying or composting, among other things. I think composting comes closest to Vererdung since it is dried and then can be mixed with soil to produce compost.
"Composting is a method for managing sewage sludge wherein the organic components of the sludge are biologically decomposed under controlled conditions to a state where the resulting composted material can be handled, stored and/or applied to land without adversely affecting the environment (Golueke 1977). The resulting compost will be drier and more stabilised than dewatered, raw or digested sewage sludge, thus emitting less odorous compounds and attracting fewer vectors (e.g. rats, flies). Furthermore, if the composting facility is properly designed and operated, pathogens will be below detectable levels due to self-heating during the composting process."