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Method for treating aniline waste water by absorption-low temperature dry method

A technology for aniline wastewater and dry treatment, which is applied in the direction of adsorption water/sewage treatment, natural water treatment, chemical instruments and methods, etc. It can solve the problems of high loss rate of activated carbon adsorption capacity, increased loading and unloading costs, and loss of activated carbon, etc., to achieve excellent Adsorption performance, industrial water saving, low cost effect

Active Publication Date: 2008-09-17
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the thermal regeneration process, the activated carbon after adsorption saturation has to be treated at a high temperature of 800-850°C, which consumes a lot of energy; at the same time, the high-temperature operation makes the adsorption capacity loss rate of activated carbon large, and the adsorption capacity loss of activated carbon is 5-15% every time regeneration is performed; In addition, high-temperature operation also requires a specific regeneration device for activated carbon to be regenerated, thereby increasing loading and unloading costs and causing a certain amount of activated carbon loss during transportation; moreover, the aniline and other pollutants desorbed during the regeneration process need to be post-treated, and the process is complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of Cu5 / AC Catalyst

[0015] The specific surface area of ​​100g 40-60 mesh is 1000m 2 Add activated carbon per gram into 100ml 0.78mol / L copper nitrate solution, stir, place at room temperature for 4 hours, dry at 80°C for 9 hours, calcinate at 300°C for 3 hours, and cool naturally to room temperature. Catalyst A, the weight of metal components in the catalyst is: Cu5%, activated carbon 95%, marked as Cu5 / AC.

[0016] Cu5 / AC Adsorption - Use of Catalyst

[0017] Containing 1000mg / L aniline wastewater 50ml is passed through the adsorption column that 0.5g Cu5 (wt%) adsorption-catalyst is housed (carrier activated carbon specific surface area is 1000m 2 / g), when the concentration of aniline in the waste water discharged after adsorption was equal to 4.9mg / L, stop the water intake, get rid of residual water in the reactor, feed the oxygen volume concentration in the Cu5 (wt%) carbon-based adsorption-catalyst 4% mixed gas composed of oxygen and nitrogen, the...

Embodiment 2

[0020] Preparation of Cu10 / AC Catalyst

[0021] The specific surface area of ​​100g 40-60 mesh is 1500m 2 Add activated carbon per gram into 100ml 1.56mol / L copper nitrate solution, stir, place at room temperature for 3 hours, dry at 110°C for 16 hours, calcinate at 500°C for 4 hours, and cool naturally to room temperature. Catalyst B, the weight of the metal component in the catalyst is: Cu10%, activated carbon 90%, marked as Cu10 / AC.

[0022] Cu10 / AC Adsorption - Use of Catalyst

[0023] Containing 1500mg / L aniline wastewater 50ml is passed through the adsorption column that 0.5g Cu 10 (wt%) adsorption-catalyst is housed (carrier activated carbon specific surface area is 1500m 2 / g), when the concentration of aniline in the waste water discharged after the adsorption was equal to 4.9mg / L, stop the water intake, drain the residual water in the reactor, and pass into the volume of oxygen in the Cu 10 (wt%) carbon-based adsorption-catalyst A mixture of air and nitrogen with ...

Embodiment 3

[0026] Preparation of Fe3 / AC Catalyst

[0027] The specific surface area of ​​100g 40-60 mesh is 500m 2 / g of activated carbon, added to 100ml 0.536mol / L ferric nitrate solution, stirred, placed at room temperature for 2 hours, dried at 50°C for 7 hours, calcined at 400°C for 2 hours, and naturally cooled to room temperature. Catalyst C, the weight of the metal component in the catalyst is: Fe3%, activated carbon 97%, marked as Fe3 / AC.

[0028] Fe3 / AC Adsorption - Use of Catalyst

[0029] Contain 500mg / L aniline waste water 50ml by being housed 0.5g Fe3 (wt%) adsorption-catalyst adsorption column (carrier active carbon specific surface area is 500m 2 / g), when the concentration of aniline in the waste water discharged after the adsorption was equal to 4.9mg / L, stop the water intake, drain the residual water in the reactor, feed the oxygen volume concentration in the Fe3 (wt%) carbon-based adsorption-catalyst 6% mixed gas composed of oxygen and argon, the space velocity is 5...

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Abstract

A low temperature dry treatment method of aniline wastewater by adsorption comprises the steps of feeding aniline wastewater into a fixed-bed reactor filled with adsorption-catalyst until the aniline concentration in the effluent wastewater after adsorption is 4.9 mg / L, discharging residual water in the reactor, introducing oxidizing gas with oxygen volumetric concentration of 4-6% and air speed of 500-2,000 h<-1>, reacting at 100-400 DEG C for 1-10 hours, and using the adsorption-catalyst after catalytic oxidation on the next stage of adsorption-catalytic oxidation. The inventive method can efficiently remove aniline pollutant from wastewater; and has the advantages of no secondary pollution, reusability of adsorption-catalyst, and low cost.

Description

technical field [0001] The invention belongs to an adsorption-low temperature dry method for treating aniline wastewater. Background technique [0002] Aniline is one of the important intermediates in the chemical industry. It is widely used in the production of dyes, pesticides, rubber additives, and polyurethane foams. The wastewater discharged by these enterprises has a high content of aniline. Aniline is highly toxic, carcinogenic, and refractory to organisms. The US Environmental Agency EPA lists aniline as a priority pollutant. Both developed countries and my country have strict restrictions on the content of aniline in wastewater from production workshops. my country's waste water level III discharge standard is 5mg / L. [0003] At present, the adsorption technology based on the excellent adsorption properties of activated carbon has been widely used in the field of organic wastewater and waste gas treatment. Using activated carbon as an adsorbent can effectively tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/28C02F1/72C02F103/36
Inventor 刘振宇李秉正雷智平黄张根
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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