System and method of treating waste water

A method of treating wastewater, comprising:

• providing wastewater containing a first ion and a second ion to a wastewater treating system, wherein the wastewater treating system comprises:
• a wastewater chamber, receiving the wastewater;
• a positive electrode chamber and a negative electrode chamber, respectively disposed on opposite sides of the wastewater chamber;
• an acid solution chamber, disposed between the wastewater chamber and the positive electrode chamber;
• a basic solution chamber, disposed between the wastewater chamber and the negative electrode chamber;
• a first buffer chamber, disposed between the wastewater chamber and one of the acid solution chamber and the basic solution chamber, and receiving a first buffer solution containing the first ion;
• and
• a second buffer chamber, disposed between the wastewater chamber and the basic solution chamber, and receiving a second buffer solution containing the second ion,
• providing the first buffer solution containing the first ion to the first buffer chamber and providing the second buffer solution containing the second ion to the second buffer chamber, wherein a concentration of the first ion in the first buffer solution is higher not lower than a target concentration of the first ion in the wastewater chamber, and lower not higher than a target concentration of the first ion in the one of the acid solution chamber and the basic solution chamber, and a concentration of the second ion in the second buffer solution is higher than a target concentration of the second ion in the wastewater chamber, and lower than a target concentration of the second ion in the basic solution chamber;
• and
• applying voltages to the positive electrode chamber and the negative electrode chamber,
• wherein an interface between the wastewater chamber and the first buffer chamber is a first ion exchange membrane, an interface between the first buffer chamber and the acid solution chamber is a second ion exchange membrane, and the first ion exchange membrane and the second ion exchange membrane have a first electrical polarity,
• wherein an interface between the wastewater chamber and the second buffer chamber is a third ion exchange membrane, an interface between the second buffer chamber and basic solution chamber is a fourth ion exchange membrane, and the third ion exchange membrane and the fourth ion exchange membrane have a second electrical polarity opposite to the first electrical polarity,
• wherein the first ion exchange membrane allows the first ion contained in the wastewater to pass through to reach into the first buffer chamber from the wastewater chamber, and the second ion exchange membrane allows the first ion contained in the first buffer solution in the first buffer chamber to pass through to reach into the acid solution chamber, and
• wherein the third ion exchange membrane allows the second ion contained in the wastewater to pass through to reach into the second buffer chamber from the wastewater chamber, and the fourth ion exchange membrane allows the second ion contained in the second buffer solution in the second buffer chamber to pass through to reach into the basic solution chamber.