| 摘要 |
A method for neutralizing sulfuric acid wastewater by using calcined dolomite is provided to reduce the total cost by substantially reducing the injection quantity of calcined dolomite required for the neutralization and the amount of sludge generated accordingly, wherein the calcined dolomite is an alkaline material such as calcium hydroxide used for the treatment of wastewater, particularly for the neutralization of sulfuric acid wastewater. In a method for neutralizing sulfuric acid wastewater by using calcined dolomite through an apparatus(100) for neutralizing sulfuric acid wastewater comprising an equalization tank(12) on which an air blower(10) is installed, and into which sulfuric acid wastewater is injected, a first reaction tank(16) to which the sulfuric acid wastewater that has been injected into the equalization tank is transferred through a pipe(P1) by the operation of a transfer pump(13), a first settling tank(20) to which a mixture that has been reacted in the first reaction tank is transferred through a pipe(P2), and in which gypsum(19) is settled, a second reaction tank(22) to which first treated water except the gypsum that has been settled in the first settling tank is transferred through a pipe(P3), a second settling tank(24) to which a mixture that has been reacted in the second reaction tank is transferred through a pipe(P4), which has the gypsum settled on a bottom face thereof, and which finally discharges second treated water except the gypsum that has been settled on the bottom face of the second settling tank through a pipe(P5), and a dehydrator(14) for dehydrating the gypsum to remove waste gypsum and transfer filtrate to the first reaction tank, the method comprises: injecting calcined dolomite into the first and second reaction tanks to neutralize the sulfuric acid wastewater, neutralizing sulfuric acid wastewater with the calcined dolomite to a pH range of 1.5 to 11.0 in the first reaction tank; and neutralizing the sulfuric acid wastewater again with the calcined dolomite to a pH range of 7.5 to 11.0 to perform an efficient reaction of high concentration fluorine in the second reaction tank. |
