The invention discloses a method for recovering
coin protein sugar dregs and preparing
protein nitrogen sources and
nitrogen-containing syrup in the production of enzymatic
corn starch sugar, comprising the steps of size mixing, liquefying, saccharifying, standing separation,
centrifugal separation,
proteolysis, concentration,
drying, compounding, and the like. In the invention,
protein is condensed under the heat flash of liquefying, the protein
sugar dregs concentrate and float upwards in saccharifying, the sugar dregs are recovered through the steps of standing separation and
centrifugal separation, the sugar dregs are dried into protein, or the sugar dregs are hydrolyzed to prepare
protein nitrogen sources, and the
nitrogen sources can be compounded with syrup to form nitrogen-containing
starch syrup for fermenting. Clarified saccharification liquid after
centrifugal separation is decolored, filtered, refined and concentrated, and
starch syrup products are obtained. The majority of lentous sugar dregs in the saccharification liquid are removed before the treatment of decoloring and filtering, and the decoloring and filtering performance of the material is better. The use level of
active carbon, and the like can be properly reduced, the production capability of filtering equipment is improved, and the frequency of the loading and unloading of filters as well as the consumption of washing waste water and various kinds of loss are greatly reduced.