Treatment purifying device for chemical sewage

The utility model belongs to the technical field of environment-friendly sewage treatment, and particularly relates to a treatment purifying device for chemical sewage. In the treatment purifying device for chemical sewage, a water inlet pipe is connected with an adjusting tank; the adjusting tank is sequentially connected with a Fenton physical-chemical tank and a primary sedimentation tank through a pipeline; an outlet of the primary sedimentation tank is sequentially connected with an aeration sand settling tank, a primary settling tank, a contact anaerobic tank and a CASS tank through a pipeline; a supernate outlet is formed at the upper part of the CASS tank and connected with a purifying tank through a pump and a pipeline. Given the characteristics of complicated composition, multiple toxic and harmful substances, bad biochemical property, high salt content, high chroma and the like of chemical sewage, the device improves the treatment efficiency, reduces the treatment cost of chemical comprehensive sew