Abstract: During the production of potato starch, juice containing protein and other organic components was produced. If the juice is directly discharged, its protein will be decomposed and produce odorous substances such as cadaverine, putrescine, spermine, indole and sulfide, which will cause air pollution. In this study, a strain degrading protein in the potato starch juice was screened, and the odor produced by degradation was lower than the odor threshold. The degraded potato juice could be used for irrigation, and the waste was utilized effectively. By preliminary screening and re-screening, a strain capable of degrading casein was obtained. The potato juice was fermented with the strain, and then by determination of volatile components, no odor components such as indole and hydrogen sulfide were found. The content of cadaverine, putrescine, spermidine, and spermine was very low. The odor was extremely low by sensory evaluation. And the fermentation activity maintained very well at 15 ℃. Through the Handbook of Bacteriology, physiological and biochemical identification , as well as 16S rRNA identification, this strain was identified as Serratia marcescens and named NXYS-S.
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