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Process for harmless disposal of high-concentration high-salt phenol-containing wastewater and recovery of high-purity sodium chloride

A technology for phenol wastewater and sodium chloride, which is applied in the field of harmless disposal of high-concentration and high-salt phenol-containing wastewater and high-purity sodium chloride recovery process, can solve the waste of resources, the difficulty in treatment of high-concentration and high-salt phenol-containing wastewater, To deal with high cost problems, to achieve the effect of reducing material cost, realizing resource utilization and simple operation

Inactive Publication Date: 2018-12-18
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problems mainly addressed by the present invention are: (1) the difficulty and high cost of treating high-concentration, high-salt and phenol-containing wastewater; (2) the existing disposal process produces a large amount of hazardous waste, resulting in a large waste of resources

Method used

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  • Process for harmless disposal of high-concentration high-salt phenol-containing wastewater and recovery of high-purity sodium chloride
  • Process for harmless disposal of high-concentration high-salt phenol-containing wastewater and recovery of high-purity sodium chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take 500ml of high-concentration and high-salt phenolic wastewater (COD Cr : 65736mg / L, ammonia nitrogen: 1419.2mg / L, full salt: 69460mg / L, pH=11.8), place in the laboratory vertical air flotation device, open the air compressor,

[0021] At 20°C, air is introduced into the waste water for primary oxidation. During the primary oxidation process, the air flow rate is 22L / min, and the oxidation time is 5h. After the oxidation is complete, transfer the wastewater in the air flotation device to a four-necked flask, adjust the pH value of the water sample to 3.2 with 30% hydrochloric acid, stir for 10 minutes, filter, and remove the precipitate to obtain acidic wastewater, water quality COD Cr Reduced to 37287mg / L;

[0022] Add hydrogen peroxide to the acidic wastewater after primary oxidation for hydrogen peroxide oxidation. During the secondary oxidation process, add 8ml of hydrogen peroxide to each liter of acidic wastewater, and the oxidation time is 3h. After the seco...

Embodiment 2

[0026] Take 500ml of high-concentration and high-salt phenolic wastewater (COD Cr : 57321mg / L, ammonia nitrogen: 1273.2mg / L, full salt: 47683mg / L, pH=12.1), be placed in laboratory vertical air flotation device, open air compressor,

[0027] At 20°C, air is introduced into the waste water for primary oxidation. During the primary oxidation process, the air flow rate is 26L / min, and the oxidation time is 4.5h. After the oxidation is complete, transfer the wastewater in the air flotation device to a four-necked flask, adjust the pH value of the water sample to 3.8 with 30% hydrochloric acid, stir for 10 minutes, filter, and remove the precipitate to obtain acidic wastewater, water quality COD Cr Reduced to 23563mg / L;

[0028] Add hydrogen peroxide to the acidic wastewater after primary oxidation for hydrogen peroxide oxidation. During the secondary oxidation process, add 10ml of hydrogen peroxide to each liter of acidic wastewater, and the oxidation time is 2h. After the secon...

Embodiment 3

[0032] 1000L of high-concentration and high-salt phenolic wastewater (COD Cr: 42400mg / L, ammonia nitrogen: 1018mg / L, full salt: 4592.0mg / L, pH=10.5), carry out the workshop pilot test amplification, utilize the pump to transfer in the R105A reactor, open the reactor to stir and carry out the wastewater system stirring, open the workshop The wind line, under the condition of 20 ℃, feeds air into the R105A reactor for primary oxidation. During the primary oxidation, the air flow rate is 30L / min, and the oxidation time is 4h. After the primary oxidation, transfer the wastewater in the R105A reactor to the R105B reactor, use 30% hydrochloric acid in the workshop storage tank to adjust the pH value of the water sample to 3.5, turn on the R105B and stir for 10 minutes, and then pour the wastewater in the R105B reactor into the M105A board box for filtration, the filtered water quality COD Cr Reduced to 24245mg / L.

[0033] Perform secondary oxidation on the filtered acidic wastewat...

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Abstract

The invention especially relates to a process for harmless disposal of high-concentration high-salt phenol-containing wastewater and recovery of high-purity sodium chloride, belonging to the field oftreatment of high-concentration high-salt wastewater in the pesticide and chemical industry. According to the invention, a combination of physical treatment and chemical treatment is adopted; a treatment idea taking a hydroquinone oxidation intermediate as an oxidation target is employed; a multi-stage step-by-step composite oxidation manner is utilized; air oxidation is implemented at the first stage to precipitate insoluble precipitates; by means of filtration, the CODs of wastewater can be reduced by about 40%; hydrogen dioxide oxidation is conducted at the second stage, and reaction conditions are controlled to remove small-molecular organic matters in the wastewater; a strong oxidant is employed in the third-stage oxidation for deep oxidation; and high-purity sodium chloride in the wastewater having undergone multi-stage oxidation treatment is recovered by using an MVR evaporation process, and the recovered sodium chloride meets the internal quality standard of enterprises, and has a content of 95% or more. With the process of the invention, the recycling of the by-product sodium chloride can be realized while the treatment cost of the phenol-containing wastewater is reduced,so the purpose of resourceful disposal is achieved.

Description

technical field [0001] The invention belongs to the field of high-concentration and high-salt wastewater treatment in pesticide chemical industry, and in particular relates to a harmless treatment of high-concentration, high-salt and phenol-containing wastewater and a high-purity sodium chloride recovery process. Background technique [0002] In the production process of the phenol production section of the pesticide quinhefop, due to the excessive dosing of hydroquinone and the limitation of product yield, a large amount of high-concentration and high-salt wastewater containing hydroquinone is produced, and the COD can reach as high as [0003] 70000mg / l, full salt up to 72000mg / l, each ton of product can produce 10 tons of waste water containing hydroquinone. The main components in the wastewater are organic substances such as hydroquinone and its oxides, cyclic compounds, A3 (a pesticide intermediate), dimethylamine, and inorganic salts such as sodium carbonate and sodium...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/14C02F101/12C02F101/34
CPCC01D3/14C02F1/04C02F1/722C02F1/74C02F1/76C02F9/00C02F2101/12C02F2101/345
Inventor 李平马韵升赵云飞石盼盼王宗
Owner CHAMBROAD CHEM IND RES INST CO LTD
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