A sewage denitrification and phosphorus removal system and control method thereof

Abstract

The present application provides a wastewater denitrification and phosphorus removal system and its control method. The wastewater denitrification and phosphorus removal system has a water inlet and a water outlet, and also includes an anaerobic tank, a front anoxic tank, an aerobic tank, a rear anoxic tank, and a vibrating filtration membrane tank, which are connected in sequence. The anaerobic tank is connected to the water inlet, and the vibrating filtration membrane tank is connected to the water outlet. A first return line is provided between the vibrating filtration membrane tank and the front anoxic tank, a second return line is provided between the aerobic tank and the front anoxic tank, and a third return line is provided between the front anoxic tank and the anaerobic tank. The controller can control the actual return ratio of the first return line to 200% to 300%, the actual return ratio of the second return line to 50% to 600%, and the actual return ratio of the third return line to 50% to 100%. By using the controller to automatically control the return ratio of each return line within the above range, the present application can maintain the environmental balance of the anaerobic tank and the front anoxic tank, and can improve the denitrification and phosphorus removal effect of the wastewater to meet the Class A emission standard.

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