Process and device for treating phenol-containing wastewater

Abstract

The invention discloses a process and device for treating phenol-containing wastewater. The process comprises the steps: carrying out oil removal by filtration, extraction and separation, phenol adsorption and advanced oxidation, delivering adsorbed wastewater into a first fixed bed reactor, adding 0.05-0.2% (volume) of hydrogen peroxide, and carrying out an oxidation reaction under the action ofa solid catalyst bed layer; delivering the wastewater subjected to advanced oxidation into a second fixed bed reactor, adding 0.002-0.01% (volume ratio) of ozone, and carrying out a catalytic oxidation reaction under the action of the solid catalyst bed layer; and sequentially carrying out evaporation, cooling crystallization, centrifugal separation and desalting treatment on the wastewater subjected to catalytic oxidation to obtain an industrial-grade sodium sulfate product. By using the process, the wastewater treatment efficiency is increased, the industrial-grade sodium sulfate product isobtained, the use amounts of adsorption resin, hydrogen peroxide, sodium hydroxide and the like are reduced, and the environment pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of catalytic oxidation chemical industry, and in particular relates to a treatment process and device for phenol-containing wastewater. Background technique [0002] The production enterprises of coking phenol and gasified phenol will produce high-salt and high-concentration phenol-containing wastewater. During the recovery process of high value-added organic phenols in this type of wastewater, wastewater with high salt, high phenol and high toxicity will still be produced ; This type of wastewater mainly contains saturated concentration of sodium sulfate, various types of tar, pyridine base, cyanide, phenol and other heterocyclic and polycyclic compounds. Among them, the main components of phenolic compounds are phenol, o-cresol, m-cresol, p-cresol, xylenol, catechol and its homologues; heterocyclic compounds include: pyridine, quinoline, imidazole, Indole, diazabenzene, azabiphenyl, etc.; polycyclic aroma...

AI Technical Summary

Problems solved by technology

Although this process can realize the effective treatment of this type of wastewater, it has the following disadvantages: in the extraction process, the service life of the extractant is short; the resin adsorption is easy to block, the adsorption efficiency is not high, and the amount of resin and regeneration agent is large, and it is not easy to use Conventional process for regeneration; the biochemical system is huge and inefficient; the evaporation system is difficult to operate, crystallization is difficult, and the salt is black, with a strong pungent smell. Sodium sulfate solids can only be treated as hazardous waste

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