Treatment method of wastewater containing dimethylamine

Abstract

The invention relates to a treatment method of wastewater containing dimethylamine. The method comprises the following steps of: introducing raw water of the wastewater containing the dimethylamine into a reactor, adding a salt forming agent, controlling the pH value at 3-4, and performing full reaction; hoisting a solution after reaction by a water pump, enabling the solution to enter a first-stage reverse osmosis device, separating by a first-stage membrane, then enabling the produced water to enter a water production box, and enabling first-stage concentrated water to enter a second-stage reverse osmosis device; separating by a second-stage membrane, then enabling the produced water to enter the water production box, and transferring second-stage concentrated water into an external unit for recovering the dimethylamine in the concentrated water; and adding alkali liquor into the water production box, regulating the pH of the water in the water production box to 6.5-7.5, hoisting by the water pump, enabling the water to enter a third-stage reverse osmosis device, separating by the membrane, then enabling the produced water to enter a recycling water box for being recycled for production, enabling third-stage concentrated water to return to the reactor of the raw water of the wastewater containing the dimethylamine for mixing with the raw mater, and then performing circulating treatment. The treatment method has the characteristics of reducing the emission of the wastewater, reducing the environmental pollution, improving the repeated utilization rate of water resources and the like.

Description

technical field [0001] The invention relates to a method for treating wastewater containing dimethylamine (DMA) produced by a dimethylformamide (DMF) recovery device in the synthetic leather and artificial leather industries, and belongs to the technical field of wastewater treatment. Background technique [0002] Dimethylamine (DMA), also known as aminodimethylamine or N-methylmethylamine, English name: Dimethylamine, molecular formula C 2 h 7 N, molecular weight: 45.08, easily soluble in water, has a strong stimulating effect on eyes and respiratory tract. [0003] In the process of recycling dimethylformamide (DMF) in the synthetic leather and artificial leather industry, the wastewater containing dimethylamine (DMA) produced in the rectification section of the DMF recovery unit is the main source of wastewater for enterprises in the synthetic leather and artificial leather industry. Wastewater contains a small amount of dimethylamine (0.1-0.5wt%) and also contains DMF ...

AI Technical Summary

Problems solved by technology

Due to the poor biochemical properties of dimethylamine, the hydrolysis of DMF and dimethylamine will produce amines, which will eventually be converted into ammonia nitrogen (NH 3 -N), total nitrogen (TN), but the biochemical oxygen demand (COD) required for biochemical wastewater is low, which cannot provide enough carbon source for microorganisms to carry out the "nitrification-denitrification" biochemical reaction, which will eventually cause ammonia nitrogen to be unable to be completely degraded , the tail water ammonia nitrogen discharged after wastewater treatment seriously exceeds the standard and cannot be reused

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