维生素b _(12)广泛应用于医药和食品工业，主要由微生物发酵得到。
Vitamin B_ (12) is widely used in medicine and food additive, which is produced mainly by fermentation.
着重综述了维生素k的生产工艺。探讨了化学合成法生产维生素k的废液的治理途径，论证了微生物发酵法生产维生素k的可行性。
Its production technology was reviewed emphatically, the treatments of wastewater were discussed, and the new idea of vitamin K production by microbial fermentation was brought forward too.
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