A kind of recovery and treatment method of wastewater containing organic solvent

Abstract

The invention provides a method for recycling wastewater containing organic solvent, the method comprising: subjecting wastewater containing organic solvent to nanofiltration membrane treatment to obtain nanofiltration permeate and nanofiltration retentate; Distillation treatment, the volatile organic components are condensed and then subjected to rectification treatment to obtain a separated organic solvent; the remaining water-rich components after the distillation treatment and rectification treatment are subjected to adsorption treatment to obtain adsorption effluent. The method of the invention effectively separates the organic and inorganic components and different organic components in the wastewater by sequentially performing nanofiltration, distillation and rectification treatment on the wastewater containing organic solvents, so that the organic components can be recycled; the In the method, the water-rich components after the distillation treatment are subjected to adsorption treatment to further realize the separation and recovery of the remaining organic solvent components; the method is simple in operation, low in cost, suitable for many types of wastewater treatment, and has a wide application range.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for recycling wastewater containing organic solvent. Background technique [0002] With the rapid development of economy and society, the discharge of organic wastewater is increasing day by day. Based on the needs of environmental protection and resource utilization, the harmless treatment of organic wastewater is of great significance. Organic wastewater generally includes two types. For the type with many types of organic components and complex components, it is often difficult to separate and recover different components. To achieve zero discharge, complete oxidation is usually required; while for the main organic components It is a type of waste water of small molecular organic solvents, and the organic solvent content is relatively high. Usually, the separation of organic components can be carried out to reduce environmental pollution and realize the rec...

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Problems solved by technology

[0004] CN 104355470A discloses a recovery device for glycerin in high-salt organic wastewater, including a complexation system, a nanofiltration system, an evaporator, a crystallizer, a decomplexation reaction tank, a centrifugal device, a distillation tower, a rectification tower, and a glycerin storage tank The two inlets of the complexation system are respectively connected with the high-salt organic waste water outlet and the solid outlet of the centrifugal device, the water outlet of the complexation system is connected with the water inlet of the nanofiltration system, and the dialysate outlet of the nanofiltration system is connected with the water outlet of the nanofiltration system in turn. The evaporator and the crystallizer are connected, the concentrated liquid outlet of the nanofiltration system is connected with the water inlet of the decomplexation reaction tank, and the water outlet of the decomplexation reaction tank is connected with the centrifugal device, distillation tower, rectification tower and glycerin storage tank in turn; The device is mainly used for the separation of organic solvents and inorganic salts in wastewater. It does not involve organic solvents, and the number of inorganic ions that can be separated by the nanofiltration system is relatively small, and the valence state of ions is also required, which limits its application range.

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