Process and equipment for processing pesticide wastewater

Abstract

The invention provides a process for processing 2,4-D (2,4-dichlorophenoxyacetic acid) pesticide wastewater, comprising the following steps: extracting the wastewater by using an oil-phase extractant to remove a part of organic matters, adding water phase into an adsorbing system to further remove organic matters, removing salt by using a nanofiltration membrane and optionally cleaning the nanofiltration membrane. The organic matters and the salt in the wastewater can be extracted, concentrated, separated and recycled, and a 2,4-D pesticide wastewater quasi-zero emitting processing cleaner producing process system is formed integrally.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and equipment for treating 2,4-dichlorophenoxyacetic acid (2,4-D) pesticide production wastewater, and belongs to the field of pesticide production wastewater treatment. Background technique [0002] 2,4-dichlorophenoxyacetic acid (2,4-D) and various derivatives produced from 2,4-dichlorophenol are phenoxycarboxylic acid herbicides, which play an important role in increasing the yield of crops It plays an important role and has a wide range of applications. Wastewater containing toxic pollutants such as 2,4-D and 2,4-dichlorophenol is produced in the production process. At present, there are almost no successful examples of methods that can completely treat this type of waste water. The pollution and treatment of this type of waste water have become constraints The bottleneck problem of industry development. Existing treatment technologies for 2,4-D...

AI Technical Summary

Problems solved by technology

However, the ELM system complicates the process due to the introduction of surfactants. It must be composed of three processes: milk making, extraction, and demulsification. The membrane leakage of ELM reduces the extraction rate of solutes, and the liquid due to entrainment and osmotic pressure difference The swelling of the membrane leads to the dilution of the concentrated solute in the internal phase, the reduction of the mass transfer driving force and the decrease of the membrane stability. In addition, there are problems such as the incomplete separation of the aqueous phase and the extraction phase after the demulsification, which limits its The successful application of

At present, there is no effective treatment of 2,4-D production wastewater, and there is no process technology to achieve zero discharge. In this patent, the recovery of valuable materials and quasi-zero discharge are realized by using the supporting liquid membrane as the main body and combining adsorption and membrane separation technology. Emissions to achieve technological breakthroughs

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