Method for chromium treatment by feather degradation liquid

The invention discloses a method for chromium treatment by a feather degradation liquid. The method adopts the feather degradation liquid to be directly mixed with chromium pollutants to reduce chromium in the chromium pollutants, and the feather degradation liquid is a fermentation liquid obtained by performing fermentation by adopting feathers as a carbon and nitrogen source. The method specifically comprises the following steps: preparing the feather degradation liquid obtained by performing degradation fermentation on the feathers by stenotrophomnas maltophilia or/and bacillus subtilis for20 h or more; performing solid-liquid separation on the feather degradation liquid to prepare a supernatant; performing concentration on the supernatant to prepare a feather degradation concentrate;and uniformly mixing the feather degradation liquid, the supernatant or the feather degradation concentrate and the chromium pollutants, and allowing the mixed solution to stand for 0.5-1.5 h to reduce hexavalent chromium in t