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Ortho-aminophenol wastewater treatment and recycling method

A technology for o-aminophenol and wastewater treatment, applied in water/sewage treatment, chemical instruments and methods, special compound water treatment, etc. problem, to achieve the effect of continuous production process, low production cost and high removal rate

Inactive Publication Date: 2017-09-05
NANJING INNOVATION CENT FOR ENVIRONMENTAL PROTECTION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention with the publication number CN102910757A proposes a method for treating wastewater produced by o-nitrophenol with XDA series macroporous adsorption resin, and uses ozone to oxidize the remaining organic matter in the adsorption solution. Since the method does not activate the resin, Therefore, the recovery rate of o-nitrophenol is low, and the treatment cost of COD removal by ozone oxidation is relatively high, and the effect is limited.
[0004] The treatment methods of the above several o-aminophenol production wastewater have high treatment costs, and the recovery of o-aminophenol is limited

Method used

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  • Ortho-aminophenol wastewater treatment and recycling method

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Embodiment 1

[0024] The present embodiment o-aminophenol waste water treatment and resource recovery method, carry out according to the following steps:

[0025] 1. Wastewater pretreatment: adjust the pH value of o-aminophenol wastewater to 7.5 with sulfuric acid or sodium hydroxide, and filter;

[0026] 2. Resin activation: at 60°C, successively use 1.5BV of 8% H 2 SO 4 and 8% NaOH are circulated for 2 hours respectively, and the circulating liquid is drained;

[0027] 3. Resin adsorption: pass the filtrate in step 1 into a resin column filled with G2 resin for adsorption. The resin processing capacity of G2 resin is 200BV, and the processing speed is 2BV / h;

[0028] 4. Advanced treatment: adjust the pH value of the filtrate absorbed by the resin column in step 3 to 3 with concentrated sulfuric acid, add iron filings to aerate the reaction for 4 hours, adjust the pH value of the micro-electrolyzed water to 7, filter, and adjust the pH value of the filtrate value to 4, add FeSO 4 and h...

Embodiment 2

[0036] The present embodiment o-aminophenol waste water treatment and resource recovery method, carry out according to the following steps:

[0037] 1. Wastewater pretreatment: adjust the pH value of o-aminophenol wastewater to 8 with sulfuric acid or sodium hydroxide, and filter;

[0038] 2. Resin activation: at 60°C, successively use 1.5BV of 8% H 2 SO 4 and 8% NaOH are circulated for 2 hours respectively, and the circulating liquid is drained;

[0039] 3. Resin adsorption: pass the filtrate in step 1 into a resin column filled with G2 resin for adsorption. The resin processing capacity of G2 resin is 200BV, and the processing speed is 2-2.5BV / h;

[0040] 4. Advanced treatment: adjust the pH value of the filtrate absorbed by the resin column in step 3 to 3 with concentrated sulfuric acid, add iron filings to aerate the reaction for 4 hours, adjust the pH value of the micro-electrolyzed water to 7, filter, and adjust the pH value of the filtrate value to 3, adding Fe(NO 3...

Embodiment 3

[0048] The present embodiment o-aminophenol waste water treatment and resource recovery method, carry out according to the following steps:

[0049] 1. Wastewater pretreatment: adjust the pH value of o-aminophenol wastewater to 8 with sulfuric acid or sodium hydroxide, and filter;

[0050] 2. Resin activation: at 60°C, successively use 1.5BV of 8% H 2 SO 4 and 8% NaOH are circulated for 2 hours respectively, and the circulating liquid is drained;

[0051] 3. Resin adsorption: pass the filtrate in step 1 into a resin column filled with G2 resin for adsorption. The resin processing capacity of G2 resin is 200BV, and the processing speed is 2BV / h;

[0052] 4. Advanced treatment: adjust the pH value of the filtrate absorbed by the resin column in step 3 to 3 with concentrated sulfuric acid, add iron filings for aeration reaction for 4 hours, adjust the pH value of the micro-electrolysis water to 8, filter, and adjust the pH value of the filtrate value to 3, add FeCl 2 and hydr...

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Abstract

The invention discloses an ortho-aminophenol wastewater treatment and recycling method and relates to a wastewater treatment method with at least one chemical treatment step. The method comprises the following steps: 1, performing wastewater pretreatment; 2, performing resin activation; 3, performing resin adsorption; 4, performing advanced treatment; 5, performing resin regeneration; and 6, recycling the ortho-aminophenol. According to the ortho-aminophenol wastewater treatment and recycling method disclosed by the invention, multiple technologies such as resin adsorption, microelectrolysis, a Fenton process and an activated carbon adsorption technology are combined, so that the ortho-aminophenol wastewater is treated, the ortho-aminophenol and chroma in the wastewater can be efficiently removed, 3.723g of the ortho-aminophenol can be recovered from per liter of wastewater at most, and the recycling purity is higher than 92%. The method has the advantages of simplicity in operation, continuous production process, less waste residues, zero waste gas, zero wastewater and the like, is clean and environmental-friendly and can be widely applied to treatment of the ortho-aminophenol. The method disclosed by the invention belongs to the technical field of wastewater treatment.

Description

technical field [0001] The invention relates to a wastewater treatment method with at least one chemical treatment step, in particular to a treatment and resource recovery method of o-aminophenol wastewater. Background technique [0002] 2-Amino-1-hydroxybenzene is an important chemical intermediate widely used in many production fields such as dyes, medicines, and plastics. With the rapid development of modern industry, the demand for o-aminophenol as an intermediate is increasing day by day, but the production technology of o-aminophenol in China is still relatively backward, and the wastewater from o-aminophenol process has a large amount of water, high toxicity and difficult treatment Great features. If this type of wastewater is not properly treated, it will cause serious pollution to the environment, and at the same time the o-aminophenol in the wastewater cannot be recovered and will also cause economic losses. [0003] At present, there are relatively few treatment...

Claims

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Application Information

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IPC IPC(8): C02F9/06C07C213/10C07C215/76C02F101/34C02F101/38
CPCC02F1/001C02F1/283C02F1/285C02F1/461C02F1/66C02F1/705C02F1/722C02F1/725C02F9/00C02F2101/345C02F2101/38C02F2303/16C02F2305/026C07C213/10C07C215/76
Inventor 胡大波孙宝江邱玉刘福强姜笔存惠战友常邦华李爱民
Owner NANJING INNOVATION CENT FOR ENVIRONMENTAL PROTECTION IND
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