Extraction tower and back-extraction tower process and device for treatment of phenol-containing wastewater

Abstract

The invention relates to the technical field of sewage treatment, and specifically relates to an extraction tower and back-extraction tower process and device for treatment of phenol-containing wastewater. The device comprises an extraction tower and a back-extraction tower; and an extraction mixed-phase liquid outlet pipe, a support in the extraction tower, extraction mixing equipment and an extraction tower liquid inlet mixing three-way pipe are arranged in the extraction tower, the top of the extraction tower is provided with a gas discharge pipe, the bottom of the extraction tower is provided with a venting pipe, the upper part of the extraction tower is provided with a phenol-containing extraction phase liquid outlet pipe, and the lower part of the extraction tower is provided with adephenolized wastewater outlet. The extraction tower and back-extraction tower process and equipment for treatment of the phenol-containing wastewater provided by the invention adopt a kerosene-basedextractant and a liquid sodium hydroxide back-extraction agent, and are safe and reliable to operate, the equipment has a compact structure, and is simple and easy to maintain, the extraction treatment efficiency is high, the recovery costs of the extractant are low, the recovery rate is high, the operating labor is less, and the process and equipment are simple to operate and control and easy toimplement.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an extraction tower and stripping tower process and equipment for treating phenolic waste water. Background technique [0002] Phenol-containing wastewater mainly comes from coking, oil refining, petrochemical, gas power stations, chemical industry, papermaking, synthetic fiber and other industries. [0003] The phenolic content and characteristics of this type of wastewater vary with different types of industries, even in the same industry. The composition of coking wastewater is complex, containing phenol, chlorophenol, phenoxy acid, ammonia, sulfide, cyanide, tar and other substances, and the COD is high. Wastewater contains 1600-3200 mg / L of volatile phenols and 300-500 mg / L of non-volatile phenols. Wastewater from coal gas generation station, when bituminous coal is used as gasification fuel, the water quality is very bad. The content of SS is very high, includin...

AI Technical Summary

Problems solved by technology

[0008] At present, there are still many problems in the treatment of high-phenol-containing wastewater by solvent extraction, such as the selection of extractant, improper selection will bring great hidden dangers to safety production, complex process operation, complex equipment, low phenol removal rate, and low operating efficiency. Problems such as high difficulty in control may even directly affect the normal operation of the system

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