Method for recycling alkali treatment lignocellulose waste fluid

The invention relates to a method for recycling alkali treatment lignocellulose waste fluid. The method comprises the following steps: 1) adopting alkali liquor treatment lignocellulose to perform solid-liquid separation, and obtaining lignocellulose treatment residue and waste fluid I; 2) washing the lignocellulose treatment residue in the step 1), and collecting washing waste fluid II; 3) adjusting the pH of the waste fluid I and the waste fluid II, precipitating lignin, performing centrifugal separation to obtain alkali lignin, supernatant II 1 and supernatant I 1 for biogas fermentation, and mixing the supernatant II 1 with the lignocellulose treatment residue washed in the step 2); 4) adjusting the pH of the mixed system of the supernatant II 1 and the lignocellulose treatment residue in step 2), adding cellulase for enzymolysis, and obtaining hydrolysate obtaining fermentable sugars. According to the method for recycling alkali treatment lignocellulose waste fluid, the recycling of the waste fluid in the lignocellulose alkali pretreatment process is achieved, no environmental pollution is caused, and the process operating cost is reduced.