Preparation process of quartz-sand-loaded in-site oxidation iron-plating arsenic removal column and water body arsenic removal method

The invention provides a preparation process of a quartz-sand-loaded in-site oxidation iron-plating arsenic removal column and a water body arsenic removal method. According to the preparation process of the arsenic removal column, four-step injection circulation is utilized, an FeSO4 solution, anaerobic deionized water and an NaClO solution are alternately injected into a quartz sand column, and after Fe is oxidized by NaClO in an experiment column, a quartz-sand-loaded iron oxide/hydroxide envelope is formed on the surface of quartz sand; meanwhile, anaerobic deionized water is added between FeSO4 and NaClO solutions for buffering, so that a water inlet is prevented from being blocked by a great amount of precipitates generated at the water inlet, uniform dispersion reaction of the deionized water is achieved in the experiment column, and a uniform iron oxide/hydroxide coating is formed on the surface of quartz sand. Compared with an arsenic removal method, the preparation process has the advantages that the arsenic removal effect is good, the secondary pollution is avoided, meanwhile, the cost is low, the process is simple, and furthermore, beneficial thoughts are further provided for field popularization and application.