Wastewater treatment method and wastewater treatment equipment for recycling reactants and unreacted chemicals

摘要

A wastewater treatment equipment is provided with a reaction tank and a separate reaction unit installed in the reaction tank. In the separate reaction unit, a reaction different from a reaction in the reaction tank is carried out with returned sludge and a acid or alkali. Reactants are generated from the returned sludge in the separate reaction unit and then introduced from a bottom portion of the separate reaction unit into the reaction tank so as to be used for wastewater treatment.