Disk filter for preventing scale formation and water treatment apparatus and method using the same

A water treatment apparatus comprising:

• a disk filter comprising:
• a housing;
• a raw water inlet formed at a predetermined position on a side surface of the housing;
• a raw water outlet formed at a central region in a bottom of the housing;
• a backwash water outlet formed at a central region in a top of the housing;
• a ceramic filter provided inside the housing, the ceramic filter having an upper barrier and a lower barrier to allow backwash water supplied by a recovery unit to flow through the ceramic filter during a backwash process, wherein the backwash water flows through the recovery unit and is then supplied to flow through the ceramic filter during the backwash process;
• a scale formation inhibitor loaded in a flow channel formed inside the ceramic filter, wherein the raw water introduced via the raw water inlet passes through the ceramic filter and then through the flow channel filled with the scale formation inhibitor, and is then discharged via the raw water outlet;
• an anaerobic tank including a first inlet for feeding raw water containing nitrate (NO3−) and a second inlet for feeding raw water containing a carbon source;
• an anammox reaction tank including a third inlet for feeding raw water containing an ammonium ion (NH4+) and a treatment water outlet and containing an anammox microorganism therein, the anaerobic tank positioned atop the anammox reaction tank and including an outlet opening on a lower surface thereof in flow communication with the anammox reaction tank;
• and
• the disk filter disposed upstream of the third inlet and configured to remove a scale-inducing material from the raw water containing the ammonium ion, wherein a direction of supply of backwash water through the ceramic filter is always in the opposite direction of a direction of the raw water.