Treatment method of organic nitrogen-containing oil refining waste alkali liquid

The present invention discloses a treatment method of an organic nitrogen-containing oil refining waste alkali liquid. The treatment method comprises: (1) carrying out air flotation oil removing to remove oil substances entrained in the waste alkali liquid; (2) carrying out high-temperature wet oxidation, wherein the oil removed waste alkali liquid is subjected to a high-temperature wet oxidation treatment; (3) carrying out gas-liquid separation, wherein the treated waste alkali liquid is subjected to gas-liquid separation; (4) adding sodium hydroxide to the waste alkali liquid being subjected to the gas-liquid separation so as to increase the concentration of the sodium hydroxide in the waste alkali liquid; and (5) carrying out evaporation concentration, wherein the waste alkali liquid being subjected to the alkali concentration adjusting is subjected to evaporation concentration, and the produced high concentration sodium hydroxide solution is reused in the step (4) and/or the alkali washing tower on the upstream. With the method of the present invention, the COD, the sulfides and the organic nitrogen in the oil refining waste alkali liquid can be efficiently removed, the sodium salt in the waste alkali liquid being subjected to the wet oxidation treatment can be recovered while the produced sodium hydroxide solution can be recycled, and the zero emission of the oil refining waste alkali liquid is achieved.