Ortho-aminophenol wastewater treatment method

Abstract

The invention relates to an ortho-aminophenol wastewater treatment method which effectively solves the problems of treatment for ortho-aminophenol wastewater and implementation of wastewater recovery. The method comprises the following steps: filtering the ortho-aminophenol wastewater, and regulating the pH value to 6-8; preparing a composite extractant from bis(2-ethylhexyl) phosphate, tri(octyl-deca)alkyl tertiary amine and a diluter, sending the composite extractant and ortho-aminophenol wastewater into a cyclone floatation extraction apparatus, introducing air or nitrogen, reacting for 0.3-1.5 hours, transferring the ortho-aminophenol from the wastewater phase into the oil phase, sending the wastewater into an ozone reaction tower, and adding H2SO4 or HCl into the cyclone floatation extraction apparatus, wherein the composite extractant in the cyclone floatation extraction apparatus is regenerated and recovered by utilizing the H2SO4 or HCl; and introducing ozone from the bottom of the ozone reaction tower, adding a catalyst into the wastewater to remove the residual micromolecule organic pollutants, and directly recovering the wastewater. The method is simple to operate, has the advantages of low cost, favorable effect and high recovery rate of ortho-aminophenol (up to 99% above), improves the environment and saves the resources.

Description

technical field [0001] The invention relates to wastewater treatment, in particular to a method for treating o-aminophenol wastewater. Background technique [0002] With the development of modern industry, the pharmaceutical and dye industry is playing an increasingly important role, and it is also an area that has received a lot of attention, because in the production process of pharmaceuticals and dyes and their intermediates, there are a large number of inorganic raw materials and The organic raw materials are transferred to the wastewater, so that the wastewater has high pollutant concentration, deep color, high salt content, high toxicity, and is difficult to treat. However, most of the technologies used in the production of aminophenol in my country are relatively backward, resulting in a large amount of wastewater. polluted environment. If it is not recycled and handled properly, it will not only cause economic losses, but also pollute the environment. [0003] O-amin...

AI Technical Summary

Problems solved by technology

Because it contains benzene ring, it is highly toxic, and the biodegradability of wastewater discharged during production is poor, causing great harm to the environment.

The traditional synthesis method is to use o-nitrochlorobenzene as raw material, hydrolyze and reduce iron powder to make it. The three wastes are seriously polluted during the reduction process.

Although some manufacturers have adopted liquid-phase hydrogenation and electrolysis production, the pollution has been reduced, but there are still

So far, no report has been found to effectively realize the resource utilization of o-aminophenol production wastewater