ADVANCED NUTRIENT REMOVAL SYSTEM; ANR

摘要

A method and an apparatus for advanced treatment of wastewater by improving the activated sludge process are provided to remove residual suspended solids and dissolved organic matters by installing an aerobic biofilm filter tank, improve nitrification efficiency of the aerobic tank by supplying a portion of nitrifying microorganisms cultured in the aerobic biofilm filter tank using backwashing water, and control concentration of total nitrogen of final effluent by returning treated water of the aerobic biofilm filter tank to an anoxic tank. A method for advanced treatment of wastewater by improving the activated sludge process comprises the processes of: (i) installing an internal partition wall in an aerobic tank to divide the aerobic tank into an anoxic tank(101) and an aerobic tank(102); (ii) passing treated water of the aerobic tank through a secondary settling basin(103) and an aerobic biofilm filter tank(104) in which hydrophilic filter media are filled; (iii) discharging treated water of the aerobic biofilm filter tank through a treated water tank(105); (iv) injecting an inorganic coagulant into the front of the secondary settling basin to remove phosphorous from wastewater; and (v) supplying a portion of backwashing water(109) containing high concentration nitrifying microorganisms of the aerobic biofilm filter tank, and transferring the rest of the backwashing water to the front of a primary settling basin(111) in order to improve nitrification efficiency of the aerobic tank.