Phenolic wastewater treatment method and device thereof

Abstract

The invention discloses a phenol-containing wastewater treatment method and a device thereof, and the method comprises the following steps: separating phenol-containing wastewater into a high-concentration mother solution and a low-concentration washing solution, respectively treating the mother solution and the washing solution, extracting the washing solution by adopting an extraction agent, carrying out heavy component removal treatment on the mother solution, and then extracting the mother solution by adopting the extraction agent; performing heavy component removal treatment on the mother liquor through a dehydrating tower, extracting the light components at the top of the dehydrating tower by adopting an extracting agent, and arranging an evaporator at the bottom of the dehydrating tower and used for evaporating materials at the bottom of the dehydrating tower; combining light components at the top of the dehydrating tower with the washing liquor, and extracting by adopting an extracting agent; wherein the evaporator is a scraper type evaporator. The device comprises a dehydrating tower, an extracting tower, a stripping tower, a separating tower, a product tower and a regenerating tower. According to the method, the raw material sodium chloride does not need to be purchased additionally, phenol sodium salt is not generated additionally, the sales way of the phenol sodium salt does not need to be considered, and waste residues are directly incinerated; and the recovery purity of phenol products is high.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method and device for phenol-containing wastewater. Background technique [0002] Phenol-containing wastewater refers to wastewater mainly containing volatile phenols and non-volatile phenols discharged during industrial production. Coking plants, coal gas generating stations, synthetic phenol plants, pharmaceutical plants, synthetic fiber plants and other production processes will produce a large amount of phenol-containing wastewater. Volatile phenols and non-volatile phenols often exist at the same time in the wastewater. The coking plant wastewater mainly contains volatile phenols, and the gas generation Station wastewater mainly contains non-volatile phenols. In addition to phenol, phenolic wastewater also contains oil, suspended solids, sulfide, ammonia nitrogen, cyanide and other pollutants. The treatment of phenol-containing wastewat...

AI Technical Summary

Problems solved by technology

[0006]1. The purity of recovered phenol is low, only 85%, the yield is low, and the recovery rate of phenol is less than 70%;

[0008]3. High energy consumption, only high-concentration phenolic water can be recovered, and low-concentration wastewater is difficult to recycle due to high cost;

[0009]4. Low degree of automation

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