NOVELTY - Improved sludge digestion method by ultrasound and photosynthetic bacteria involves feeding anaerobic bacteria with ultrasound pretreated sludge into anaerobic reactor. Sludge digestion is performed using anaerobic microorganisms and facultative anaerobic microorganisms for 48-72 hours. Obtained sludge is processed using ultrasonic processors and sonicated for 30-60 minutes.    USE - Method for improved sludge digestion by ultrasound and photosynthetic bacteria (claimed).    ADVANTAGE - The method ensures reduced discharge of sludge and less emissions. The method requires short processing time of 8.5 days, and has digestive efficiency of 60%. The organic content is released in form of carbon dioxide, methane and hydrogen that are consumed by microorganisms. The method provides improved resource efficiency.    DETAILED DESCRIPTION - Improved sludge digestion method by ultrasound and photosynthetic bacteria involves feeding anaerobic bacteria with ultrasound pretreated sludge into anaerobic reactor. Sludge digestion is performed using anaerobic microorganisms and facultative anaerobic microorganisms for 48-72 hours. Obtained sludge is processed using ultrasonic processors and sonicated for 30-60 minutes. Low-energy ultrasound is utilized to promote anaerobic digestion sludge having photosynthetic bacteria. Anaerobic digestion is performed in closed membrane bioreactor for 24 hours under condition of continuous light. The process is continued for 5-8 days, and the obtained product is subjected to ultrasonic treatment every day in ultrasonic wave device. Ultrasonic wave process is carried out 1-3 times, where each process is carried out for 30-60 minutes. Carbon dioxide, methane and hydrogen are produced and collected by collecting device. Sludge is filtered through 9-10 mu membrane filter after digestion. Photosynthetic bacteria promote aerobic digestion of obtained anaerobic fermentation broth under natural light conditions for 36-48 hours. The broth is fed into ultrasonic device and sonicated 2-8 times. The fermentation broth is filtered through 0.4-0.5 mu filter after every 30-60 minutes.