Method for reducing total nitrogen, total phosphorus and COD in low-molasses alcohol waste mash

The invention discloses a method for reducing total nitrogen, total phosphorus and COD in molasses alcohol waste mash. The method comprises the following steps: diluting the molasses alcohol waste mash till a COD value is 1800 to 2000 mg/L, adjusting the pH value to be 6.8 to 7.0 with a NaOH solution with the concentration being 1 mol/L, and performing sterilization for 20 min at 121 DEG C, so asto obtain a culture medium; inoculating microalgae into the culture medium, performing light shake-flask culture, ensuring that the light intensity is 3800 to 4200 lux, the shaker speed is 145 to 155r/min, and the culture temperature is 23 to 27 DEG C, and measuring total nitrogen, total phosphorus and COD values in the culture medium. The method has the advantages that the total nitrogen, totalphosphorus and COD values in the molasses alcohol waste mash through the microalgae, and pollution to the environment by reducing substance in the molasses alcohol waste mash is reduced; in addition,energy is saved, the treatme