Method for treating wastewater generated in production of 2-naphthol

A technology for producing wastewater and treatment methods, applied in water/sewage treatment, natural water treatment, extraction water/sewage treatment, etc., can solve the problems of high oxidant cost, technical difficulty, complicated process, etc., and achieve easy control, cost reduction, Simple to use effects

Inactive Publication Date: 2015-05-06
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The biochemical method has high treatment efficiency and a high compliance rate of purified wastewater, but it is mainly aimed at low-to-medium concentration wastewater, and the proce

Method used

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  • Method for treating wastewater generated in production of 2-naphthol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Extraction process

[0031] Get TBP 7.5mL, n-octanol 7.5mL, hexanaphthene 35mL mix and be mixed with extraction agent, regulate the pH of waste water to 0.5 with dilute sulfuric acid, be 1: 1 with extraction agent (50mL) and waste water to be treated ( 50mL) together into a 250mL Erlenmeyer flask, oscillated and extracted at a constant speed on an air bath constant temperature oscillator (temperature 30°C, speed 150r / min) for 60min, then placed in a separatory funnel for phase separation for 30min.

[0032] (2) Activated carbon adsorption

[0033] Add 2.0 g of activated carbon to the raffinate, and vibrate at a constant speed for 1.5 h in a constant temperature shaker in a water bath (temperature 45° C., rotation speed 150 r / min).

[0034] (3) Stripping and desorption

[0035] Finally, after testing, the COD of wastewater was reduced from 11120mg / L to 480mg / L, and the removal rate reached 95.68%.

Embodiment 2

[0037] (1) Extraction process

[0038] Get TBP 7.5mL, n-octanol 10mL, hexanaphthene 32.5mL mix and be mixed with extraction agent, adjust the pH of waste water to 0.5 with dilute sulfuric acid, be 1:1.2 with extraction agent (50mL) and waste water to be treated ( 60mL) together into a 250mL Erlenmeyer flask, oscillated and extracted at a constant speed on an air bath constant temperature oscillator (30°C, 150r / min) for 60min, then placed in a separatory funnel for 30min to separate phases.

[0039] (2) Activated carbon adsorption

[0040] Add 2.0 g of activated carbon to the raffinate, and vibrate at a constant speed for 1.5 h in a constant temperature shaker in a water bath (temperature 45° C., rotation speed 150 r / min).

[0041] (3) Stripping and desorption

[0042] Finally, after testing, the COD of wastewater was reduced from 11120mg / L to 475mg / L, and the removal rate reached 95.73%.

Embodiment 3

[0044] (1) Extraction process

[0045]Get TBP 10mL, n-octanol 10mL, cyclohexane 30mL and mix and prepare extractant, adjust the pH of waste water to 0.5 with sulfuric acid, be 1: 1 by oil-water volume ratio, extractant (50mL) and waste water to be treated (50mL) together Put it into a 250mL Erlenmeyer flask, shake and extract at a constant speed for 60min on an air bath constant temperature oscillator (temperature: 35°C, speed: 150r / min), then place it in a separatory funnel for phase separation for 30min.

[0046] (2) Activated carbon adsorption

[0047] Add 2.0 g of activated carbon to the raffinate, and shake at a constant speed for 1.5 h in a constant temperature shaker in a water bath (temperature 45° C., rotation speed 200 r / min).

[0048] (3) Stripping and desorption

[0049] Finally, after testing, the COD of wastewater was reduced from 11120mg / L to 440mg / L, and the removal rate reached 96.04%.

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Abstract

The invention discloses a method for treating wastewater generated in the production of 2-naphthol. The method comprises the following steps: (1) adding an extracting agent into acidified wastewater generated in production of 2-naphthol, uniformly stirring, extracting, after the extraction is completed, standing for layering to obtain an oil-phase extract and a water-phase raffinate; and (2) adding activated carbon to the raffinate for adsorption, after the adsorption is completed, separating to remove activated carbon to obtain purified wastewater. By combining extraction and activated carbon adsorption, the method has the advantages of high treatment efficiency, mild condition and the like and is simple to operate and easy to control, and furthermore, the extracting agent and activated carbon can be repeatedly used so that the cost is reduced and the naphthalene sulfonate in the wastewater can also be used as a resource for recycling.

Description

technical field [0001] The invention relates to the technical field of treatment of wastewater from naphthol production, in particular to a treatment method for wastewater from 2-naphthol production. Background technique [0002] In today's society, the rapid development of industry is accompanied by increasingly serious water pollution problems, and a series of problems caused by the lack of water resources have caused human life to be in trouble. Therefore, the treatment of sewage has become the focus of people's attention, especially the treatment of high-salinity organic wastewater such as 2-naphthol production wastewater. For this type of wastewater, it is people's goal to find an efficient, simple and economical treatment method . [0003] 2-Naphthol, also known as β-naphthol, is an important dye intermediate containing naphthalene, mainly used in the production of dyes and dye intermediates, and widely used in printing and dyeing, spices, textiles, etc. The producti...

Claims

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Application Information

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IPC IPC(8): C02F9/08
CPCC02F9/00C02F1/26C02F1/281C02F1/66C02F2103/36C02F2303/16
Inventor 杨春平邵京京曾光明程燕吕黎何闪英赵坤刘文灿
Owner ZHEJIANG GONGSHANG UNIVERSITY
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