| 摘要 |
The invention relates to a method for treating wastewater (5). This is achieved by using a coagulant that aggregates a phosphorus- containing substance. The method comprises the step of: executing a reaction phase having a biological treatment phase and a subsequent chemical treatment phase. The chemical treatment phase comprises the first substep of mixing the wastewater (5) while injecting (17) a predetermined dose of the coagulant into the basin (1), the injection (17) taking place at a location (17) in which the speed of the wastewater is equal to or more than 0,5 m/s in order for the coagulant to contact and coagulate the phosphorus-containing substances, wherein the injection (17) of the dose of the binding compound into the basin (1) is performed during a time period equal to or more than a time period required to accomplish two mixing turnovers of the wastewater (5) and equal to or less than a time period required to accomplish seven mixing turnovers of the wastewater (5), and the second substep of mixing the wastewater (5) such that an average speed of the wastewater (5) in the basin (1) is equal to or more than 0,1 m/s and equal to or less than 0,4 m/s, in order to flocculate the coagulated substance. |
