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 waste water treatment, which is applied in multi-stage water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. The effect of no secondary pollution and low energy consumption

Active Publication Date: 2021-06-29
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

[0032] Example 1, the quality of the wastewater to be treated is as follows:

[0033]

[0034] Using the waste water treatment process of the present invention, successively undergo 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 and dehydration drying, can obtain high-purity anhydrous sodium sulfate. 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 water...

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Abstract

The invention discloses an environment-friendly and low-energy-consumption tar-refined phenol-containing sodium sulfate wastewater treatment method. After the tar-refined phenol-containing sodium sulfate wastewater is pretreated to remove oil, suspended matter and colloid, the sulfuric acid decahydrate is frozen and precipitated in the freezing crystallizer. Sodium crystals are then centrifuged, re-dissolved, evaporated and dehydrated to obtain high-purity anhydrous sodium sulfate. The waste heat of evaporation and dehydration and some distilled water enter the concentrated nitric acid tank for dissolving nitric acid to fully recover resources; the upper layer separated after freezing The phenol-containing solution is extracted and dephenolized, electrode oxidized and biochemically treated, and the clear liquid obtained by nanofiltration membrane separation and part of the distilled water produced by evaporation and dehydration are transported to the biochemical treatment device 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): C02F9/14C02F101/10C02F101/34
CPCC02F1/001C02F1/048C02F1/22C02F1/24C02F1/26C02F1/38C02F1/40C02F1/44C02F1/4672C02F1/72C02F3/00C02F9/00C02F2101/101C02F2101/345C02F2301/08
Inventor 傅立德彭美桂王海军陈伟
Owner SHANGHAI LYMAX ENVIRONMENTAL TECH CO LTD
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