Patent ID: 8702992

Claim:
A method for treating wastewater comprising ammonium nitrogen (NH 4 + —N) and phosphate phosphorus (PO 4 3− —P) using a continuous flow reactor; the continuous flow reactor comprising a cylindrical coagulation crystallizer, a first inlet, a second inlet, a feed pipe, and an outlet; wherein the first inlet, the second inlet, the feed pipe, and the outlet are connected to the cylindrical coagulation crystallizer; the method comprising: a) adjusting a mol ratio of NH 4 + —N to PO 4 3− —P to 1.25-20:1, introducing the wastewater into the cylindrical coagulation crystallizer through the first inlet, adjusting an inflow through the first inlet to be 0.5-3 L/h, stirring the wastewater, adding a magnesium source solution comprising Mg 2+ to the cylindrical coagulation crystallizer through the second inlet, adjusting a mol ratio of Mg 2+ to NH 4 + —N in an influent comprising the wastewater flowing through the first inlet and the solution comprising Mg 2+ flowing through the second inlet to be 1-5:1, and opening the feed pipe for supplying a pH regulator solution to ensure the pH value of a reaction liquid comprising the wastewater and the solution comprising Mg 2+ to remain 7-10; and b) flowing an effluent resulting from mixing the wastewater and the solution comprising Mg 2+ out of the continuous flow reactor through the outlet and feeding it back to the continuous flow reactor through the first inlet until a removal ratio of ammonium nitrogen (NH 4 + —N) and phosphate phosphorus (PO 4 3− —P) remains stable.