A method for treating waste water containing phenolic sodium sulfate from tar refining with environmental protection and low energy consumption

A technology for sodium phenol sulfate and wastewater treatment, which is applied in water/sewage multi-stage treatment, heating water/sewage treatment, flotation water/sewage treatment, etc. Low cost, no secondary pollution, low energy consumption

Active Publication Date: 2021-07-30
SHANGHAI LYMAX ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the purpose of this invention is to provide a treatment method for tar refining sodium sulphate containing phenol wastewater, the purpose of which is to solve the problem of high energy consumption and easy generation of secondary pollution and other issues

Method used

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  • A method for treating waste water containing phenolic sodium sulfate from tar refining with environmental protection and low energy consumption
  • A method for treating waste water containing phenolic sodium sulfate from tar refining with environmental protection and low energy consumption

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example 1

[0025] Example 1, the quality of the wastewater to be treated is as follows:

[0026]

[0027] Using the waste water treatment process of the present invention, successively through demulsification and gravity oil separation, further oil removal by air flotation, complete oil removal by coke filtration, fine filtration to remove suspended solids and colloids, freezing and crystallization at 0-5°C to precipitate sodium sulfate decahydrate, Separation and recovery of the phenol-rich solution in the upper layer, centrifugal purification of sodium sulfate decahydrate crystals, redissolution of sodium sulfate decahydrate crystals, further purification by evaporation and crystallization, and disc drying, dehydration and drying, can obtain high-purity anhydrous sodium sulfate, and the grade quality of sodium sulfate reaches The national standard GB6009-2014III qualified products require that the upper phenol-containing solution obtained by freezing and separating and the distilled ...

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Abstract

The invention discloses an environment-friendly and low-energy-consumption treatment method for tar-refined phenol-containing sodium sulfate wastewater. A treatment device for tar-refined phenol-containing sodium sulfate wastewater is provided, including a gravity oil separation tank, an air flotation device, a coke filter, a precision filter, and freeze crystallization. device, centrifuge, nitrate dissolving device, evaporator and disc dryer, the tar-refined phenol-containing sodium sulfate wastewater is successively demulsified, gravity degreasing, air flotation degreasing, the coke filter is once filtered, and the The precision filter is filtered twice, and sodium sulfate decahydrate is frozen and precipitated in the frozen crystallizer, and then centrifuged, re-dissolved, evaporated and dehydrated to obtain high-purity anhydrous sodium sulfate, and the frozen upper layer contains phenolic solution The distilled water produced by evaporation is returned to the production for reuse. The whole process of this process has low energy consumption, zero discharge and no secondary pollution.

Description

technical field [0001] The invention relates to the field of environmental protection wastewater treatment, in particular to a method and process for treating tar-refined phenol-containing wastewater. Background technique [0002] The sodium sulfate wastewater produced during the tar refining process is a high-salt phenol-containing process wastewater produced in the crude phenol extraction process. macrocyclic and heterocyclic substances, and there is a certain amount of tar-like substances in the wastewater. [0003] Conventional treatment methods mainly include biological oxidation, adsorption and solvent extraction. The biological oxidation method treats phenol-containing wastewater, and the phenol content should be less than 300ppm. If the phenol concentration is too high, it will directly inhibit and kill microorganisms. At the same time, this method is highly sensitive to external changes, and the treatment equipment occupies a large area, and the investment and oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D5/18C02F101/10C02F101/34
CPCC01D5/18C02F1/04C02F1/22C02F1/24C02F1/40C02F9/00C02F2101/101C02F2101/345
Inventor 傅立德彭美桂王海军陈伟
Owner SHANGHAI LYMAX ENVIRONMENTAL TECH CO LTD
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