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Treatment for waste water of benzidine production by two-section adsorbing method an d resource recovery method

A technology for production wastewater and resource recovery, applied in the direction of adsorption water/sewage treatment, separation methods, neutralization water/sewage treatment, etc., can solve the problems of incomplete and effective adsorption, separation and recycling of o-chloroaniline

Inactive Publication Date: 2007-08-08
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Laboratory research results show that directly using one-stage resin adsorption method, under the optimized experimental operating conditions, the content of o-chloroaniline after treatment is about 50mg / l, which is much higher than the emission standard of aniline pollutants formulated by the State Environmental Protection Administration. Adsorption separation and recycling of o-chloroaniline in benzidine production wastewater is far from thorough and effective

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Put 20ml of composite functional resin (NDA-88) into two jacketed glass adsorption columns (Φ32×360mm) respectively. At room temperature (20°C), adjust the pH of the benzidine production wastewater to 6 (adjusted with sodium hydroxide solution), first pass through the first section of composite functional resin bed at a flow rate of 5BV / h, and the wastewater treatment capacity is 25BV / batch , and then adjust the pH of one section of the adsorbed water to 9 (adjusted with sodium hydroxide solution), and make it pass through the second section of composite functional resin bed at a flow rate of 15BV / h, and the wastewater treatment capacity is 100BV / batch. The COD of the original wastewater is 5784mg / l, and the content of o-chloroaniline is about 4073mg / l. After the first stage of resin adsorption, the COD is lower than 500mg / L, and the content of o-chloroaniline is lower than 50mg / L; after the second stage of resin adsorption , the o-chloroaniline content is les...

Embodiment 2

[0022] Replace the composite functional resin used in Example 1 with NDA-99, adjust the pH of the benzidine production wastewater to 5 at a temperature of 40°C (adjusted with sodium hydroxide solution), and first pass through the first section at a flow rate of 1BV / h Composite functional resin bed layer, the wastewater treatment capacity is 10BV / batch, then adjust the pH of one section of adsorption water to 7 (adjusted with sodium hydroxide solution), and make it pass through the second section of composite functional resin at a flow rate of 5BV / h bed, the wastewater treatment capacity is 50BV / batch. Use 2BV 4% HCl aqueous solution + 4BV water at 40°C at 1BV / h to pass through the first section of composite functional resin bed for desorption, use 1BV 4% HCl+3BV aqueous solution at 40°C at 5BV / h The flow passes through the second section of composite functional resin bed for desorption.

[0023] Under the above operating conditions, the adsorption effect of wastewater has no ...

Embodiment 3

[0025] Replace the two glass adsorption columns in Example 1 with two polypropylene adsorption columns (Φ160×1000mm), each column is filled with 10 kilograms (about 13L) of composite functional resin (NDA-88), according to 700 times the amount of the embodiment The wastewater treatment capacity in 1 is operated, and the adsorption temperature of the two-stage resin is controlled to be 10°C, and the effect of adsorption treatment and segmented resource recovery consistent with that of Example 1 can be obtained.

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Abstract

The invention discloses a processing method of benzidine manufacturing wastewater and resource recycling method, which comprises the following steps: adjusting pH value of benzidine manufacturing wastewater to 4-7; adsorbing through first composite functional resin; recycling o-chloroaniline; adjusting adsorbed water to 7-10; adsorbing through second composite functional resin; reducing COD below 500mg / L and o-chloroaniline below 5mg / L; adsorbing first composite functional resin through HCl solution completely; obtaining high-density desorption liquid; neutralizing through NaOH solution; separating; recycling o-chloroaniline with density over 98%; regenerating the second composite functional resin through the same method; allocating the first resin through high-density desorption liquid; reducing the discharge quantity of organic pollution.

Description

technical field [0001] The invention relates to a treatment and resource recovery method for dye and organic pigment intermediate benzidine production wastewater, more specifically a method for adsorption, separation and recycling of o-chloroaniline in benzidine production wastewater. Background technique [0002] Benzidine is an important dye intermediate widely used in the manufacture of direct dyes, acid dyes, vat dyes, ice dyes, sulfur dyes, reactive dyes and organic pigments. The commonly used production process in China is to produce hydroazobenzene by reduction of nitrobenzene, and then rearrangement. In this production process, a large amount of high-concentration organic wastewater is discharged, with a pH value of about 2 and a COD of 5000-7000mg / L , containing 3000-5000mg / l o-chloroaniline and other organic matter, the concentration of organic matter in wastewater is high and the toxicity is high, and it is difficult to effectively treat it with conventional metho...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/66B01J20/34
Inventor 刘福强赵卫伟荆晓生朱兆连李爱民陈金龙
Owner NANJING UNIV
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