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A method for the treatment and resource recovery of sewage containing hydroquinone

A hydroquinone and resource recovery technology, applied in water/sewage treatment, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve problems such as difficult water treatment, waste of phenol resources, waste of resources, etc. Achieve the effect of low production cost, simple equipment and simple operation

Active Publication Date: 2022-04-29
JINGBO AGROCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the treatment of hydroquinone-containing sewage is mainly through evaporating solid waste containing hydroquinone, wasting precious phenol resources. Yang Yan and others used the solubility of hydroquinone in ethyl acetate to The characteristic of solubility is obtained by extracting hydroquinone in water with ethyl acetate and then distilling, distilling ethyl acetate for reuse in the next extraction, and obtaining the product cooling and crystallization. The recovery rate of hydroquinone in this method is 34.1%. The rate is low and there is still a large amount of hydroquinone that has not been recovered, which wastes resources and causes subsequent water treatment difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example comes from the hydroquinone-containing water produced during the production process of the herbicide quizalofop-p-p-ethyl. It has been determined that the content of hydroquinone in the sewage is 19000 ppm, and the phenol production section of the workshop produces 1600 kg of sewage per batch.

[0026] A method for the treatment and resource recovery of sewage containing hydroquinone, the specific treatment process is as follows: first add 2500kg of sewage into a 3000L kettle, directly add 50g of polyacrylamide flocculant (PAM) and 12.5kg of decolorizing flocculant, Stir evenly, fully flocculate, decolorize, and precipitate until the system no longer produces flocs, and filter out the insoluble matter after standing still; the filtrate is adjusted to pH = 1 with 30% hydrochloric acid, and a large amount of insoluble matter appears after stirring evenly, add PAM 25g Flocculation, add 25kg of activated carbon for decolorization, mix well and let it stand for a...

Embodiment 2

[0028] This example comes from the hydroquinone-containing water produced during the production of the herbicide quizalofop-p-p-ethyl. The content of hydroquinone in the sewage was determined to be 22000 ppm, and the phenol production section of the workshop produced 1600 kg of sewage per batch.

[0029] A method for the treatment of sewage containing hydroquinone and resource recovery, the specific treatment process is as follows: first add 2300kg of sewage into a 3000L kettle, directly add 46g of PAM and 11.5kg of decolorizing flocculant to the sewage, stir evenly, and fully flocculate , decolorization, precipitation, until the system no longer produces flocs, filter out insolubles after standing still; add 28.75kg of hydrochloric acid with a mass concentration of 30% to the filtrate, and a large amount of insolubles will appear after stirring evenly, add PAM 23g for flocculation, add activated carbon 11.5 kg for decolorization, mix well and let it stand for 4 hours to absorb...

Embodiment 3

[0031] This example comes from the hydroquinone-containing water produced during the production of the herbicide quizalofop-p-p-ethyl. The content of hydroquinone in the sewage was determined to be 22000 ppm, and the phenol production section of the workshop produced 1600 kg of sewage per batch.

[0032] A method for the treatment of sewage containing hydroquinone and resource recovery. The specific treatment process is as follows: first add 2300kg of sewage into a 3000L kettle, directly add 23g of PAM and 11.5kg of decolorizing flocculant to the sewage, stir evenly, fully flocculate, Decolorize and precipitate until the system no longer produces flocs, and filter out the insolubles after standing still; add 27.6kg of hydrochloric acid with a mass concentration of 30% to the filtrate, and a large amount of insolubles will appear after stirring evenly, add 23g of PAM for flocculation, and add 11.5kg of activated carbon for decolorization , fully mixed and left to stand for adsor...

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Abstract

The invention belongs to the technical field of sewage treatment, and specifically relates to a method for treating sewage containing hydroquinone and recycling resources. The specific steps are as follows: adding polyacrylamide flocculant and decolorizing flocculant to the sewage, flocculation and sedimentation and filtration; the filtrate adjusts the pH , adding polyacrylamide flocculant for precipitation, activated carbon for decolorization, and then filtering. After adjusting the pH of the filtrate, adding an antioxidant, concentrating the water, and obtaining the mother liquor of hydroquinone, then cooling down, crystallizing with cold salt, and filtering to obtain hydroquinone Phenol products, still contain a small amount of hydroquinone in the filtrate, mix with hydroquinone mother liquor and apply mechanically to the next batch. Through the method of the present invention to treat sewage containing hydroquinone, the amount of organic matter is greatly reduced, the recovered hydroquinone product content is relatively high, the single-pass recovery rate is about 75%, the chroma of the raw water is improved, and the evaporation efficiency is improved. Recovery of hydroquinone products, distilled water has no impact on biochemistry.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for treating sewage containing hydroquinone and recycling resources. Background technique [0002] Hydroquinone is an expensive organic chemical raw material, which is widely used in pesticide synthesis, medicine, dyestuff and other industries, and is used as flame retardant and antioxidant. At the same time, excessive hydroquinone is dissolved in water during use to form toxic phenolic sewage. Phenolic sewage is one of industrial sewage with a wide range of sources. Phenol and its derivatives are aromatic compounds and are protoplasmic poisons. Organisms are toxic and difficult to degrade. It will have an impact on the biochemical system, and will also pollute drinking water sources, causing serious pollution to water bodies. Phenolic sewage has been listed as one of the harmful sewage that needs to be urgently addressed in my country's water pollution contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C07C37/86C07C37/82C07C37/70C07C37/84C07C37/68C07C39/08C02F101/34C02F103/36
CPCC02F9/00C07C37/86C07C37/82C07C37/70C07C37/84C07C37/685C02F1/56C02F1/001C02F1/66C02F1/283C02F1/54C02F2101/345C02F2103/36C07C39/08
Inventor 李晓艳王祥传于连友王杰房立彬李在波
Owner JINGBO AGROCHEM TECH CO LTD
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