Method for removing sulfate ions in power plant wastewater

The invention discloses a method for removing sulfate ions in power plant wastewater, belongs to the technical field of water treatment, and solves the problems of high cost, secondary pollution and low efficiency in the existing method. The method comprises the following steps: adding lime and sodium metaaluminate into wastewater according to a certain ratio, stirring for 60-120 minutes at normaltemperature, performing standing for 30-90 minutes, performing filtering, conveying filter residues to a stockpiling field, and reserving filtrate for later use; 2, adding a coagulant into the filtrate treated in the step 1, performing stirring for 30-60 minutes at normal temperature, standing for 30-60 minutes, performing filtering, conveying filter residues to a stockpiling field, and reservingthe filtrate for later use; and 3, adding a coagulant aid into the filtrate treated in the step 2, performing stirring at normal temperature for 10-30 minutes, performing standing for 30-60 minutes,and performing filtering to