The invention relates to the technical field of
sewage treatment, in particular to a domestic
sewage treatment system which comprises an
impurity removal box and a second
water pipe, a disinfection
barrel is integrally formed on the right side of the
impurity removal box, a water pump is fixedly installed at the bottom of the inner side of the disinfection
barrel, and one side of the disinfection
barrel communicates with a first
water pipe. A biological purification box is fixedly connected to the end, away from the disinfection cylinder, of the first
water pipe, the front side of the biological purification box communicates with an
ultrafiltration cylinder through a second water
pipe, and a drainage
pipe is fixedly connected to one side of the
ultrafiltration cylinder; and a mounting frame is fixedly connected between the inner walls of the
impurity removal box. According to the improved
sewage treatment system, impurities in sewage are removed through the impurity removal box, then the sewage is disinfected and precipitated through the disinfection cylinder, the impurity removal box provides power for a stirring part of the disinfection cylinder when working, meanwhile, the sewage enters the disinfection cylinder to trigger a
buoyancy air bag to automatically add disinfection
powder into the disinfection cylinder, and the disinfection
powder is matched with rotation of the main shaft; the
powder is automatically and uniformly thrown into the sewage.