Continuous pretreatment method of maleic anhydride emulsifying waste water

The invention discloses a continuous pretreatment method of maleic anhydride emulsifying waste water. The continuous pretreatment method comprises the following steps of after the maleic anhydride emulsifying waste water is deposited, delivering a supernatant I into an adsorption tank, adding an adsorbent, stirring for absorption, then carrying out solid-liquid separation, and carrying out drying and incinerating treatment on deposits obtained through the solid-liquid separation; adding a flocculating agent to a supernatant II obtained through the solid-liquid separation, adding an oxidizing agent to a supernatant III obtained through the solid-liquid separation after flocculating deposition, and delivering a supernatant IV obtained through oxidizing reaction into a biochemical treatment unit; returning lower deposited residues which are respectively obtained after the flocculating deposition and the oxidizing reaction into the adsorption tank to participate in a next period of adsorption separation. According to the continuous pretreatment method, high-oil content emulsifying waste water generated in a process for preparing maleic anhydride through a normal butane oxidation method is pretreated, the COD of pretreated waste water is obviously reduced, and phthalate is reduced to be less than 20 ppm, so that low toxicity on microbes and less foaming are achieved, and the requirement for subsequent biochemical method treatment is met.