Process principle
1. The sewage first enters the sewage treatment system through the grille, which removes the large particles of solid objects in the sewage. The grid gap is 5mm to ensure the stable operation of the subsequent treatment device. Sewage removes the solid particles and flows into the regulating tank. 2. Sewage enters the regulating tank to fully adjust the water quantity and water quality of sewage, and buffer the load impact on the treatment system due to the uneven changes in water quality and water quantity. A submersible sewage pump is set in the regulating tank to pressure and lift the sewage, and the aeration mixing system is set to prevent sewage precipitation. At the same time, it can play a homogeneous role in sewage, and play a certain pre-aeration effect on sewage, to ensure the continuous and stable operation of the subsequent treatment system, and can reduce the treatment load of the subsequent treatment system. 3. Using anoxic zone to control the dissolved oxygen and carbon source, acidify organic pollutants under hypoxic condition, convert the macromolecules and refractory organic pollutants into small molecules and easily degradable pollutants to create favorable conditions for the subsequent aerobic reaction. Meanwhile, turn nitrate nitrogen in sewage into N2 to remove ammonia nitrogen. 4. The aerobic zone is used to control the organic load and dissolved oxygen concentration, so that the organic pollutants in a variety of biological bacteria growing on the filler, and finally converted into carbon dioxide and water, completely oxidized and removed. 5. The inclined tube sedimentation tank was used as the sedimentation tank to efficiently remove the shed biota and some other insoluble substances contained in the effluent water of the contact oxidation tank. 6. The effluent gravity of the sedimentation tank flows into the clear tank, and is discharged to the standard after chlorine dioxide disinfection.