| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact apparatus which can efficiently remove nitrogen and phosphorus in a very short treatment time without using chemicals other than a sterilizing agent. SOLUTION: In a melt bonding tank 6, phosphoric acid ion attracted to an anode 5 is bonded to eluted iron ion, hydroxyl ion loses its negative charge to be converted into water and oxygen, and organic substances are decomposed by the produced oxygen. An iron phosphate flock which is going to float by the adhesion of hydrogen gas generated at a cathode 5 and ions are dispersed by air from an air diffusing tube 6a, and excessively eluted iron is adsorbed by a plate-shaped adsorbent 4. In an aeration sterilization tank 7, sterilization is done by a sterilization agent, eluted iron is oxidized to produce an iron oxide flock, ammonium ion is reacted with hypochlorous acid, which is a component of the hydrolysis of the sterilization agent, to decompose it into nitrogen gas, water, and hydrochloric acid. In a precipitation tank 8, flocks of iron phosphate and iron oxide and others are precipitated, and supernatant is separated to be discharged. |
