Method for treating wastewater with nitrogen-containing organic matters in pymetrozine production procedures

Abstract

The invention discloses a method for treating wastewater with nitrogen-containing organic matters in pymetrozine production procedures. The method includes adding the wastewater with the nitrogen-containing organic matters and lewis acidic complex extraction agents into a multi-level countercurrent complex extraction tower, obtaining extraction phase from the top of the multi-level countercurrent complex extraction tower and obtaining extraction residual phase from the bottom of the multi-level countercurrent complex extraction tower; adding the extraction phase from the top of the multi-level countercurrent complex extraction tower and back extraction volatile acid solution into a multi-level countercurrent back extraction tower, obtaining complex extraction agents for recycling from the top of the multi-level countercurrent back extraction tower and obtaining back extraction agents with the nitrogen-containing organic matters from the bottom of the multi-level countercurrent back extraction tower; adding the back extraction agents with the nitrogen-containing organic matters into an evaporation tower, condensing and absorbing steam on the top of the evaporation tower to obtain back extraction agents, recycling the back extraction agents and obtaining the nitrogen-containing organic matters from the bottom of the evaporation tower. The extraction phase obtained from the top of the multi-level countercurrent complex extraction tower is nitrogen-containing organic matter loading complex extraction agents. The method has the advantages that the removal rate for the nitrogen-containing organic matters in the wastewater can reach 95% at least, and the wastewater which meets standards can be discharged after being treated; nitrogen-containing organic intermediates with high added value can be obtained, and wastewater treatment and resource recycling can be combined with each other.

Description

technical field [0001] The invention relates to a treatment method for nitrogen-containing organic wastewater, in particular to a treatment method for nitrogen-containing organic wastewater in the production process of pymetrozine. Background technique [0002] With the rapid development of my country's agriculture, the demand for the new heterocyclic insecticide pymetrozine is increasing. During the production process of pymetrozine, a large amount of nitrogen-containing organic wastewater will be produced. If it is discharged into the water body, it will not only cause water pollution, but also cause great toxicity to animals and plants in the water body, which will eventually threaten human life and health and bring huge harm. Economic losses. [0003] At present, domestic nitrogen-containing organic waste liquid treatment methods mainly include: adsorption method, extraction method, concentration method, carbonization method, incineration method, chemical oxidation meth...

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Problems solved by technology

Adsorption methods, such as activated carbon adsorption to remove nitrogen-containing organic substances in water, are expensive and difficult to regenerate activated carbon; chemical oxidation methods will destroy nitrogen-containing organic substances in wastewater, which is not conducive to the recovery of useful chemical raw materials in wastewater; The biochemic

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