Method and system for treating wastewater with high phenol content

Abstract

The invention discloses a method for treating wastewater with high phenol content. The method comprises the steps of adding strong base to the wastewater with high phenol content, so that wastewater containing phenoxide is obtained; heating the wastewater containing phenoxide, so that preheated wastewater is obtained; conducting membrane distillation on the preheated wastewater, so that water vapor and primary concentrated solution are obtained; conducting evaporative crystallization on the primary concentrated solution, so that water vapor and crystallized crude phenol salt are obtained, and recovering the obtained crystallized crude phenol salt, wherein the obtained water vapor is condensed to generate condensate water, and the condensate water is recycled to achieve treatment of the wastewater with high phenol content. The treatment method is simple, operation is easy, and zero emission of treatment of the wastewater with high phenol content is realized through cooperation of the different steps. The invention further discloses a system for treating the wastewater with high phenol content.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a new treatment method and system for high phenol-containing waste water. Background technique [0002] Phenol-containing wastewater refers to wastewater containing phenolic organic matter produced in textile, petrochemical, plastic, resin and other industrial production, and is one of the common industrial wastewater. According to the nature of the pollutants contained, it can be divided into volatile phenol-containing wastewater and non-volatile phenol-containing wastewater. According to the concentration of the pollutants contained, it is divided into low-concentration phenol-containing wastewater and high-concentration phenol-containing wastewater. Usually, wastewater with a phenol content greater than 100 mg / L is high-concentration phenol-containing wastewater. [0003] High concentration phenolic wastewater is also called high phenolic wastewater. At present...

AI Technical Summary

Problems solved by technology

This is because phenol and its derivatives in high-phenolic wastewater have a toxic effect on microorganisms, and the biological activity of microorganisms is greatly affected, making it difficult for microorganisms to degrade phenolic organic compounds. In addition, the equipment used in the microbial degradation method has a large footprint, Disadvantages of poor running stability

[0005] 2. The extraction method has a better treatment effect on high-phenol-containing wastewater, but it needs multiple extractions and back extractions to complete the treatment. The process is very complicated and difficult to promote on a large scale

[0007] 4. The chemical oxidation method uses strong oxidizing chemicals to decompose phenolic compounds in high-phenol wastewater, but the cost of chemicals is high and it is easy to cause secondary pollution

[0008] Therefore, the existing treatment methods for high phenolic wastewater have the problem of high difficulty or high processing cost, and there is a need for a simple and low-cost method for treating high phenolic wastewater

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