Abstract
Investigations were made on a high rate anaerobic digestion procedure for treating distillers' wastes mixed with night soil, and waste water from slaughter houses from a viewpoint of vitamin B_<12> resources. The precipitated fractions obtained by centrifuging the supernatant liquor in the digesters might be used as raw materials for crystalline vitamin B_<12> or APF sources, since the fractions contain the vitamin as much as over 20 μg/g on a dry basis as in case of anaerobic digestion products of night soil, activated sludge and distillers' wastes.
