Method for processing waste lye generated in olefin separating unit alkali washing system

The invention discloses a method for processing waste lye generated in an olefin separating unit alkali washing system. The method includes the following steps that the waste lye is directly conveyed to a waste lye incinerator from the olefin separating unit alkali washing system, and an alkali washing tower kettle interface level and a butter side liquid level in the olefin separating unit alkali washing system are controlled according to a liquid level/interface level computational formula (please see the computational formula in the specification), wherein F is medium buoyancy force, D is the diameter of an inner barrel, and H is the length of the inner barrel; and rho is the medium density or a density difference of two media, when the rho is the density of butter, the butter side liquid level is obtained through computation, and when the rho is the density difference of the waste lye and the butter, the alkali washing tower kettle interface level is obtained through computation. By means of the technical