Preparation method of dephosphorizing modified gravel adsorbent

The invention belongs to the technical field of sewage treatment and particularly relates to a preparation method of a dephosphorizing modified iron gravel adsorbent. The method comprises the following steps: firstly washing gravels with water and drying the gravels at the temperature of 80-90 DEG C; grinding the gravels into powder by a grinder; mixing gravel powder with an inorganic iron salt solution to obtain a mixture, oscillating the mixture at constant temperature, filtering the mixture, and performing drying, thereby obtaining the high-efficiency dephosphorizing modified iron gravel adsorbent rich in iron oxides. Compared with the prior art, the method has the advantages of moderate preparation conditions, strong operability, and high efficiency of treatment on phosphorus wastewater, and is simple, easy to implement and capable of lowering the purification cost.