Desulfurization biochemical treatment process for coal-to-olefin waste alkali liquor

The invention relates to the technical field of wastewater treatment, in particular to a coal-to-olefin waste alkali liquor desulfurization biochemical treatment process which comprises the following steps: waste alkali liquor is sequentially subjected to desulfurization treatment, pH regulation and neutralization treatment, oil removal treatment, QBR biological pretreatment and deep treatment, and waste gas generated in each step is collected, combined, fed into a waste gas treatment device for treatment and then discharged. The method does not need harsh treatment conditions such as high temperature and high pressure, and is small in equipment investment, low in operation cost, high in practicability and easy to industrialize. The method is suitable for treating high-salinity and high-sulfur-content waste alkali liquor, and the treatment efficiency of a biological treatment method is improved. According to the method, S < 2-> generated in the waste alkali liquor treatment process can be converted into SO4