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Processing method for resource recovery of acidic dye waste water

A technology for recovery and treatment of acid dyes, applied in chemical instruments and methods, multi-stage water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problem of large area, difficult to purify thoroughly, chroma and COD concentration are difficult to reach the standard And other problems, to achieve high oxidation efficiency, improve recycling rate, and broad prospects

Inactive Publication Date: 2011-05-11
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological treatment method has the advantages of wide application range, large treatment capacity, and low cost, but it also has obvious disadvantages in the treatment of printing and dyeing wastewater: microorganisms have certain requirements for nutrients, pH value, temperature and other conditions, and it is difficult to adapt to the large fluctuations in printing and dyeing wastewater quality. , the number of dyes is large, the characteristics of high toxicity, and there are disadvantages such as large footprint, difficult to purify thoroughly, chromaticity and COD concentration are not easy to reach the standard, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At 25°C, filter 1000 mL of Disperse Orange 288# dye wastewater with a pH value less than 2 to remove suspended impurities. The waste water after filtering is added in the reactor, stir evenly, keep the constant speed of 20mL / hr and evenly add the NaClO solution 10mL (NaClO mass percentage concentration is 0.1% in waste water) and nano titanium dioxide catalyst 10g ( The mass percent concentration of nano-titanium dioxide in the waste water is 1%), and the rapid stirring is continued for 0.5 hr and then stopped, and a large amount of dark green oily matter appears in the solution. After standing still for 24 hours, the oily matter settled in the lower layer, and the supernatant was yellow. Get supernatant and cross the adsorption column that 50mL columnar activated carbon forms with the speed of 150mL / hr, collect effluent and be used for the production process of dispersing orange 288# as 100% reaction solvent, the yield of gained product is 95.13%, purity 91.35%, It ha...

Embodiment 2

[0023] The difference from Example 1 is: at 25°C, 25mL of oxidizing agent NaClO with a mass percentage concentration of 10% is evenly added dropwise (the mass percentage concentration of NaClO in wastewater is 0.25%). Matter increased compared with Example 1, and the yellow color of the supernatant was lighter than that of Example 1. After standing for 24 hours, the supernatant was passed through an adsorption column composed of 50 mL columnar activated carbon at a rate of 150 mL / hr, and the effluent was collected. The total organic carbon removal rate of the collected liquid can reach 70%, and the decolorization rate of the water sample is 55%. The collected effluent was used as 100% reaction solvent in the production process of Disperse Orange 288#. The yield of the product was 92.69%, and the purity was 90.53%, which completely reached the production standard of Disperse Orange 288#.

Embodiment 3

[0025] The difference from Example 1 is: 3mL of oxidizing agent NaClO (the mass percent concentration of NaClO in waste water is 0.03%) is uniformly added dropwise at 25° C., and the stirring is continued for 0.5 hr after the addition is completed. After standing, it is found that There is dark green oil in the upper layer of the solution, and the supernatant is slightly lighter than the wine red mother liquor. After standing for 24 hours, the supernatant was passed through an adsorption column composed of 50 mL columnar activated carbon at a rate of 150 mL / hr, and the effluent was collected. The total organic carbon removal rate of the collected liquid is about 30%, and the decolorization rate of the water sample is 25%. The collected effluent was used as 100% reaction solvent in the production process of Disperse Orange 288#. The yield of the product was 87.47%, and the purity was 80.05%, basically reaching the production standard of Disperse Orange 288#.

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Abstract

The invention discloses a processing method for resource recovery of acidic dye waste water. The method comprises the following steps: adding the acidic dye waste water subjected to filtration and impurity removal into a reactor and evenly stirring; oxidizing dissoluble organic matters in the dye waste water by using an oxidant or a mixture of the oxidant and a catalyst, and removing the corresponding components through generating suspended matters; carrying out absorption and separation process of a absorbent so that the decoloration rate of a water sample is up to 25-60%, and the total organic carbon-removing rate reaches 30-85%; and reusing the treated waste water serving as a reaction solvent in the dye production technology process and then obtaining the qualified product. The processing method for the resource recovery of the dye waste water has the advantages of high oxidization efficiency, cheap catalysis price and the like, and is simple to operate; and by using the processing method, the average utilization of the waste water is improved, the resource recycle of the dye waste water with a high-acid value and high chemical oxygen demand (COD) is achieved, so that greening is achieved in the whole dye production technology process, and the industrial application prospect is wide.

Description

technical field [0001] The invention belongs to the field of dye wastewater treatment, and in particular relates to a recycling and treatment method for acid dye wastewater. Background technique [0002] With the development of the dye and printing and dyeing industry, the amount of production wastewater has increased, accounting for about 1 / 10 of the total discharge of industrial wastewater. The dye pollutants discharged into the environment each year in the world account for about 15% of its total production. It has become one of the main sources of environmental pollution in the world. This type of wastewater has the characteristics of high chroma, complex composition, poor biodegradability, and most of the organic substances contained in it are "three-causing" (ie carcinogenic, teratogenic, mutagenic) substances, which are harmful to the environment. If it is discharged directly without treatment, it will bring serious harm to the ecological environment. Azo dyes conta...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/72C02F1/28
Inventor 黄梅陈圣福张敏东赵坤徐万福傅伟松陈华祥
Owner ZHEJIANG UNIV
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