The invention discloses a method for treating micro polluted water by using a biological
nitrogen removal and physicochemical enhanced
phosphorus removal combined process, and belongs to the technical field of
water pollution purification treatment. The inlet water enters a biological contact oxidation tank through a lifting pump, and flexible fibers are used as a film forming filler and a rotary fan is adopted for
aeration in the tank; the outlet water overflows to a quick filter tank, the bottom of the tank is provided with a
backwashing pipeline, and the tank is periodically backwashed to avoid blockage; the outlet water of the quick filter tank passes through a
deoxidization tank from bottom to top, so dissolved
oxygen (DO) in the water is reduced, and a favorable condition is provided for subsequent
denitrification; an
facultative tank realizes
denitrification by adopting a camphorwood leaf and ceramsite combined filler to remove TN; the outlet water flows into a
flocculation reaction tank and is subjected to enhanced coagulation with stirring; and soil-liquid separation is performed in a
phosphorus removal
sedimentation tank, and the supernate flows through an
anthracite filler device from bottom to top and finally flows into a lake. The method ensures that the substances such as
chemical oxygen demand (COD), NH4+-N, NO3--N, TN, TP, SS, Chla and the like in the outlet water are furthest removed, and the outlet water reaches the
class III water quality standard of
Environmental Quality Standards for
Surface Water (GB3838-2002).