Phenolic wastewater treatment system and phenolic wastewater treatment technology

Abstract

The invention provides a phenolic wastewater treatment system and a phenolic wastewater treatment technology, aiming at solving the problems of high energy consumption, proneness to causing secondary pollutants and backmixing, poor stage efficiency, difficulty in extraction agent recovery and large extraction agent loss quantity of a traditional phenolic wastewater treatment method. The phenolic wastewater treatment system comprises an extraction section and a reverse extraction section. The phenolic wastewater treatment technology includes regulating a pH value of phenolic wastewater prior to counter-current extraction, and adding alkali liquor into a loaded organic phase so as to recover the alkali liquor and an extraction agent. The phenolic wastewater treatment technology has the advantages that energy consumption in the technology is only as high as one fifth of that of the traditional technology, secondary pollutants are avoided and stage efficiency is improved remarkably; reverse extraction used for recycling the extraction agent in the technology is more energy saving than a distillation method for recycling the extraction agent and is little in extraction agent loss, sodium phenolate products are recovered in the extraction section, and the alkali liquor is returned to the reverse extraction section to be reused, so that wastewater treatment cost is reduced greatly.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a phenol-containing waste water treatment system and a process thereof. Background technique [0002] Phenol-containing wastewater is an important water pollutant, which is extremely harmful and has a wide range of sources, especially coal chemical wastewater, such as coal gas wastewater, coal oil wastewater, coking wastewater, blue carbon wastewater, etc., all contain phenol pollution thing. At present, the mainstream methods for treating such phenolic wastewater are incineration, steam dephenolization and extraction. The incineration method and the steam dephenolization method are generally used for the treatment of phenol-containing wastewater from coal gas. Wastewater, at present, most industries use extraction towers to extract phenolic substances in wastewater, and then use distillation to recover the extractant. The disadvantage of this method is: when using extraction towers for...

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Problems solved by technology

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a phenolic wastewater treatment system, the purpose is to solve the traditional phenolic wastewater treatment process of high energy consumption, easy to produce secondary pollutants, Prone to back-mixing phenomenon, low stage efficiency, difficult recovery of extractant, and large loss of extractant

[0005] For above-mentioned situation, in order to overcome the defective of prior art, the purpose of the present invention is exactly to provide a kind of phenol-containing wastewater treatment process, and purpose is to solve the high energy consumption that traditional phenol-containing wastewater treatment method technology exists, easily produces secondary pollutant, Prone to back-mixing phenomenon, low stage efficiency, difficult recovery of extractant, and large loss of extractant

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