Method and apparatus for treating wastewater

An apparatus for treating wastewater containing fluorine, the apparatus comprising:

• a water storage tank in which wastewater is stored;
• a membrane unit including a membrane having a hollow and installed so that the wastewater supplied from the water storage tank being in contact with an outer surface of the membrane;
• a pump connected to the membrane unit and configured to apply a vacuum to an inner surface of the membrane such that hydrofluoric acid (HF) gas from the wastewater disposed within the membrane unit moves through the membrane onto the inner surface of the membrane;
• and
• a scrubbing unit connected to the membrane unit and configured to react hydrofluoric acid gas recovered from the membrane unit with a metal oxide or a metal hydroxide to form a metal fluoride.

An apparatus for treating wastewater containing fluorine, the apparatus comprising:

• a water storage tank in which wastewater is stored;
• a membrane unit including a membrane having a hollow and installed so that the wastewater supplied from the water storage tank is in contact with an outer surface of the membrane;
• a pump connected to the membrane unit and configured to apply a vacuum to an inner surface of the membrane such that hydrofluoric acid (HF) gas from the wastewater disposed within the membrane unit moves through the membrane onto the inner surface of the membrane;
• a sweep gas supply unit connected to the membrane unit and configured to inject sweep gas through the inner surface of the membrane;
• and
• a scrubbing unit connected to the membrane unit and configured to react hydrofluoric acid gas recovered from the membrane unit with a metal oxide or a metal hydroxide to form a metal fluoride.