Membrane separation pretreatment apparatus including underwater plasma discharge unit

A membrane separation pretreatment apparatus comprising:

• a membrane separation unit configured to remove particulate matter contained in raw water and thereby discharge filtered water in a filtration direction;
• and
• a first underwater plasma discharge unit disposed in front of the membrane separation unit and configured to cause a portion of the raw water to be introduced into the membrane separation unit to perform a first underwater plasma discharging,
• a second underwater plasma discharge unit disposed after the membrane separation unit to cause a portion of the filtered water to perform a second underwater plasma discharging and discharge plasma-processed backwash water;
• and
• a backwashing unit configured to supply the plasma-processed backwash water, discharged from the second underwater plasma discharge unit, as backwashing water to the membrane separation unit in an opposite direction of the filtration direction.