Treatment system for industrial sewage generated in preparation of adiponitrile by direct hydrocyanation of butadiene

The utility model discloses a treatment system for industrial sewage generated in preparation of adiponitrile by direct hydrocyanation of butadiene, a classification pretreatment unit comprises a toxic sewage pretreatment module, a macromolecular organic degradation-resistant pretreatment module and a flocculent precipitation pretreatment module, and water outlets of the pretreatment modules are respectively connected to a comprehensive regulation tank through pipelines; a water outlet of the comprehensive adjusting tank is connected to the efficient biochemical reaction unit through a pipeline, and a water outlet of the efficient biochemical reaction unit is connected to the deep treatment unit through a pipeline; sludge outlets of the flocculent precipitation pretreatment module, the macromolecular organic degradation-resistant pretreatment module, the efficient biochemical reaction unit and the deep treatment unit are connected to a sludge concentration tank through pipelines, and a sludge outlet of the sl