Apparatus for purifying wastewater and method thereof

A method for purifying wastewater of the present invention comprising:

• a step to form bubble impregnated floc by adding floc forming materials and air to influent and stirring them;
• a step to conduct pressurized conveying of treatment water with the floc;
• a step to separate high density floc from the pressurized treatment water;
• and a step to separate low density floc from the high density floc separated treatment water via flotation.

A method for purifying wastewater comprising:

• a step to measure concentration of the influent;
• a step to form bubble impregnated floc by adding floc forming materials and air to the influent and stirring them;
• a step to select floc to be separated from the treatment water depending on the measurement results;
• a step to conduct pressurized conveying of the treatment water to separate high-density floc;
• a step to separate high density floc from the pressurized treatment water;
• and a step to separate low density floc from the high density floc separated treatment water via flotation.