Patent ID: 8562828

Claim:
A wastewater treatment apparatus capable of removing COD components contained in a wastewater which includes the COD components produced and discharged in a gas purification process of a gasification facility comprising: a wastewater treatment bath that treats the wastewater containing the COD components under alkaline conditions; an alkaline reagent adding unit that adds an alkaline reagent in the wastewater treatment bath so that a pH of the wastewater treatment bath is within a range from 7 to 12 based upon the alkaline reagent; an oxidizing reagent adding unit that adds an oxidizing reagent in the wastewater treatment bath to decompose the COD components; an ultraviolet treatment unit that irradiates an ultraviolet ray for decomposing the COD components; a pump that feeds an oxidizing water oxidized in the wastewater treatment bath and thereafter returns the same to the wastewater treatment bath, so as to circulate the wastewater; and an acid treatment bath having an acid adding unit that adds acid, the acid treatment bath provided on a downstream side of the wastewater treatment bath and on an upstream side of the ultraviolet treatment unit, wherein the acid treatment bath has a pH within a range of 2 to 4, wherein the ultraviolet treatment unit comprises: an ultraviolet ray-transmitting reaction bath that receives the oxidized water fed from the pump therein, wherein the ultraviolet ray-transmitting reaction bath is arranged on the downstream side of the acid treatment bath; and a pair of ultraviolet lamps disposed outside the reaction bath, so that an ultraviolet ray emitted from the pair of ultraviolet lamps passes through the ultraviolet ray-transmitting reaction bath and is irradiated on the oxidized water to decompose the COD components in the oxidized water.