The invention discloses a treating method for phosphoric waste water and
sludge generated in the production process of a phosphatic compound
fertilizer, which comprises the following steps: adding
lime milk into the phosphoric waste water to be treated firstly, and controlling a pH value to be 5-6; carrying out
neutralization reaction for the first time; adding a PAM flocculating agent for
flocculation reaction and then carrying out separation of mud and water; adding the
lime milk in the aqueous phase again, and controlling the pH value to be 10-11 for the
neutralization reaction for the second time; and adding the PAM flocculating agent again for the
flocculation reaction and then carrying out the separation of mud and water, wherein the aqueous phase reaches a
effluent standard after
filtration. The invention realizes the
multiplexing or the standard-reaching
discharge of the waste water, the zero release of the
sludge, accords to the developing direction of the energy saving and emission reduction and
circular economy. The
clear liquid treated by the process of the invention contains 0.4-0.5mg / L of
phosphate (calculated by being based on P2O5), 8-9mg / L of F and 60-80mg / L of COD, meets the
primary standard emission requirement of GB8978-1996, the ultimate
clear liquid can be returned to a
phosphoric acid device for
multiplexing, and also be directly discharged after reaching standards; and the
sludge produced by the
filtration comprises the following main components:
calcium phosphate,
calcium fluoride,
calcium carbonate and calcium
sulfate, which can be totally reused as
phosphorite resources.