What inoculum is appropriate for ABR startup?

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Koenraad Van Meerbeek

For digestion experiments, digested sludge from a wastewater treatment plant is most suited as inoculum due to the presence of a broad microbial community.

I don't think manure is appropriate as inoculum. It's the feedstock that you want to digest, not the inoculum.

Zabihollah Yousefi

Adding of activated sludge from the waste line of secondary clarifies or another ABR in the area can be help.