▎ 摘　　要

NOVELTY - Sewage treatment agent comprises 3-5 wt.% nutrient solution, 10-30 wt.% complex microbial agent and external carbon source (remaining amount). USE - The sewage treatment agent is useful for efficient denitrification. ADVANTAGE - The method promotes the enzymatic reaction of various microbial bacteria, can be matched with complex microbial inoculum in sewage treatment to improve the sewage treatment efficiency, reduces the sludge generating amount, the auxiliary to compound sludge reducing microbial inoculum, and reaches the effect of sludge decrement. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing the sewage treatment agent comprising (i) taking complex microorganisms and deionized water, mixing evenly, adding molasses and carrier, stirring and mixing for 20-30 minutes, placing them at 35-40℃ with an oxygen supply of 1 l/minutes, and cultivate them for 3-4 days to obtain a complex microbial agents, where the complex microorganisms include lactic acid bacteria, saccharomyces, Bacillus and actinomycetes, (ii) taking discarded fruits and vegetables, crushing them to obtain fruit and vegetable slurry, placing the fruit and vegetable slurry in a water bath environment at 49-51℃, adding pectinase, and carrying out enzymatic hydrolysis for 110-120 minutes, pasteurization, adding the activated yeast, fermenting, and obtaining the nutrient solution, and (iii) mixing and compounding the compound microbial agent, an additional carbon source and a nutrient solution to obtain the sewage treatment agent.