sistema de tratamento de agua residual esgoto compreendendo um tanque e reação anaerobica sem oxigenio, um tanque de reação aerobica, e um tanque de contenção e metodo de tratamento de agua residual e esgoto usando o mesmo

The present invention relates to a sewage/wastewater treatment system comprising a rectangular upflow anaerobic/oxygen-free reaction tank and a method of treating sewage/wastewater using the same. The rectangular upflow anaerobic/oxygen-free reaction tank comprises: a water introduction unit provided in the front of the anaerobic/oxygen-free reaction tank; an inlet unit having a plurality of through-holes formed therein through which water introduced from the water introduction unit passes, the inlet unit communicating with the water introduction unit and being provided at the bottom of the anaerobic/oxygen-free reaction tank; a mixing unit comprising a driving unit, a main shaft disposed in the anaerobic/oxygen-free reaction tank so as to be rotated by the driving means, and a plurality of spaced-apart stirring blades fixed to the main shaft at a right angle thereto; and an outlet unit (weir) provided at the upper portion of the anaerobic/oxygen-free reaction tank to collect the water treated by anaerobic/oxygen-free reaction tank.