▎ 摘　　要

NOVELTY - Deep processing method of waste pressing liquid comprises (i) performing waste pressing liquid for electric flocculation treatment to obtain the first processing liquid, (ii) performing nitration and anaerobic ammonia oxidation treatment to the first processing liquid to obtain the second processing liquid, (iii) mixing the second processing liquid and photocatalyst, and performing the photo-catalytic treatment, the preparation method of the photocatalyst comprises (a) mixing the alkali liquid and the diatomite, separating solid and liquid, and preparing alkali treatment diatomite, (b) mixing the alkali processing diatomite, acid liquid and titanium source, separating solid and liquid and sintering, (c) mixing the titanium modified diatomite and the graphene, separating solid and liquid to obtain graphene modified diatomite, (d) mixing chlorine source, the bismuth source, the thiourea and graphene modified diatomite, separating solid and liquid to obtain the photocatalyst. USE - The method is useful for deep processing of waste pressing liquid. ADVANTAGE - The method firstly carries out electric flocculation treatment to the waste pressing liquid, so as to realize the primary removal of chemical oxygen demand in the waste pressing liquid; then using nitration and anaerobic ammonia oxidation treatment, so as to further remove the pollutant, at last, the method deeply processes the waste water by photocatalyst, which improves the removing effect of ammonia nitrogen substance and organic pollutant in the waste water.