| 摘要 |
PURPOSE:To separate organics and phosphorus from water at a high efficiency, by charging an activated sludge to water containing organics and phosphours, and subjecting the water to an aerobic treatment followed by an anaerobic treatment to separate phosphorus as a culcium compound. CONSTITUTION:Raw water 6 is introduced with a returned sludge 7 to an aeration vessel 1, and subhected there to an aeration treatment, by which organics are decomposed by bacteria and phosphorus is absorbed by the bacteria. The treated solution is separated to a solid part and a liquid part in a precipitation vessel 2. An extracted sludge 9 is carried to a phosphorus discharging vessel 3, where a solution is kept at pH about 6-9 and agitated slowly in an anaerobic atmosphere. The bacteria consume phosphorus contained therein and discharge phosphate ions. The phosphate ions are separated as precipitations by the addition of a calcium compound 11. The treated solution is separated to a solid part and a liquid part in a separation vessel 4. The sludge 7 is returned to the aeration vessel 1. The liquid part 13 is carried into a precipitation vessel 5 where the liquid part comes in to contact with crystal seeds containing calcium phosphate in the presence of calcium ions to separate the phosphate ions. |
