METHOD FOR REMOVING PHOSPHOROUS IN WASTEWATER USING STEELMAKING SLAG

摘要

PURPOSE: A method for removing phosphorous in wastewater using steelmaking slag is provided to remove phosphorous contained in wastewater by using steelmaking slag that is a byproduct generated from an ironworks. CONSTITUTION: The method comprises a step of obtaining yard slab by water cooling steelmaking slag; injecting 2 to 10 wt.% of yard slag having a basicity (CaO/SiO2) of 4.0 to 5.0 and containing 10 to 15 wt.% of FeO into wastewater containing phosphorous, thereby reacting the yard slag with wastewater at least for one hour; and a step of recovering the slag from the wastewater, wherein the yard slag is crushed so that it has an irregular grain shape, and wherein the yard slag is injected into the wastewater as a calcined slag by calcination treating the yard slag at an air atmosphere in the temperature range of 700 to 800 deg.C for at least one hour.