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Method for removing o-phenylenediamine (OPD) in wastewater

An o-phenylenediamine and waste water technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as troublesome regeneration or replacement, high operating cost, and easy adsorption and saturation of activated carbon. , to achieve the effect of improving biodegradation performance and no secondary pollution problem

Active Publication Date: 2014-01-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, when the concentration of OPD is 400mg / L, the removal rate of OPD is 47% (the adsorption capacity of activated carbon is 50mgOPD / g activated carbon), and activated carbon is easy to absorb and saturate, and regeneration or replacement is more troublesome, resulting in higher operating costs
Similarly, the activated carbon adsorption process has the disadvantage of easily causing secondary pollution (during activated carbon regeneration)

Method used

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  • Method for removing o-phenylenediamine (OPD) in wastewater
  • Method for removing o-phenylenediamine (OPD) in wastewater
  • Method for removing o-phenylenediamine (OPD) in wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0022] O-phenylenediamine (chemically pure) and distilled water were used to prepare simulated wastewater containing OPD. The OPD concentration and COD (COD value was measured by potassium dichromate method, the same below) were 2,000mg / L and 3,900mg / L, respectively. Take 200mL of simulated wastewater and put it in an 800mL beaker, adjust the pH value to about 2 with concentrated sulfuric acid, and then add 7g / L of solid analytically pure ferric sulfate. At room temperature (15° C. to 35° C., the same below), magnetic stirring was used for 20 minutes to 120 minutes, and samples were taken at intervals. See Table 1 for the processing results.

[0023] Table 1

[0024]

[0025] It can be seen from Table 1 that when water-soluble iron salts are used to oxidize the simulated wastewater containing OPD for more than 20 minutes, the reaction time has little effect on the removal of OPD by iron ions.

Embodiment 2

[0027] O-phenylenediamine (chemically pure) and distilled water were used to prepare simulated wastewater containing OPD. The OPD concentration and COD were 2,000mg / L and 3,900mg / L, respectively. Take several simulated wastewaters with a volume of 200mL and place them in different 800mL beakers, adjust their pH values ​​to about 2 with concentrated sulfuric acid, and add different amounts of solid ferric sulfate (analytical pure) to these simulated wastewaters. , and then magnetically stirred at room temperature for 20 minutes to investigate the treatment effect of ferric sulfate at different concentrations. The results are shown in Table 2.

[0028] Table 2

[0029]

[0030] It can be seen from Table 2 that in the wastewater treatment system containing OPD, the concentration of iron ions is a key factor affecting the removal rate of OPD and COD in wastewater.

Embodiment 3

[0032] O-phenylenediamine (chemically pure) and distilled water were used to prepare simulated wastewater containing OPD. The OPD concentration and COD were 2,000mg / L and 3,900mg / L, respectively. Take several parts of simulated wastewater with a volume of 200mL and place them in different 800mL beakers, use concentrated sulfuric acid to adjust their pH value to about 2, and add 9g / L solid analytically pure iron sulfate (Fe3+ Concentration of 2.5g / L), magnetically stirred at room temperature for 20 minutes, and then added different amounts of hydrogen peroxide to these several simulated waste water, and magnetically stirred at room temperature for 60 minutes, finally with solid sodium hydroxide The pH values ​​of these several reaction systems were all adjusted to 8-9, left to settle, and the filtrate was taken for measurement. The results are shown in Table 3.

[0033] table 3

[0034]

[0035] It can be seen from Table 3 that when the dosages of ferric ions and hydrogen p...

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Abstract

The invention relates to a method for removing o-phenylenediamine (OPD) in industrial wastewater. The method comprises the main steps of: under an acidic condition, sequentially oxidizing the wastewater containing the OPD by water-soluble tetravalent ferric salt and hydrogen peroxide, and filtering to remove solids. By adopting the water treatment method provided by the invention, the OPD in the industrial wastewater can be efficiently and economically removed, thus the load of treating COD (Chemical Oxygen Demand) in the industrial wastewater subsequently is lowered, the biodegradability (due to removal of the OPD as a biotoxicity inhibitor) of the industrial wastewater is greatly improved, and a firm foundation is laid for the subsequent treatment of the industrial wastewater. In addition, the method also has the advantages of simplicity, easiness in operation, no secondary pollution, and the like.

Description

technical field [0001] The invention relates to a method for removing o-phenylenediamine in industrial waste water (abbreviated as waste water hereinafter). Background technique [0002] Based on the production process, a large amount of o-phenylenediamine (abbreviated as OPD) remains in industrial wastewater every year (according to incomplete statistics, my country produces nearly 500,000 tons of industrial wastewater containing OPD every year), and OPD is an industrial The main source of wastewater chemical oxygen demand (abbreviated as COD). In addition, because OPD has a strong inhibitory effect on organisms, it is difficult to carry out biological treatment of industrial wastewater containing OPD (industrial wastewater containing OPD belongs to refractory biodegradable wastewater). [0003] At present, the methods for removing OPD in wastewater mainly include the following: [0004] (1) Using O 3 / Fenton combined oxidation process to treat carbendazim production wast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/72
Inventor 丁雷朱明成陆文俊邵君娜赵一先
Owner EAST CHINA UNIV OF SCI & TECH
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