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).