Comprehensive treatment method for organic acid-containing wastewater and iron mud

A comprehensive treatment and wastewater technology, applied in water/sludge/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. The effect of low equipment requirements and low operating costs

Active Publication Date: 2015-03-25
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method not only has a long process and cannot recover iron, but is only suitable for wastewater from the steel industry
[0009] In summary, most of the current treatment methods are aimed at the field of inorganic industry, and the composition of iron sludge is single, which is easier to handle
However, there are fewer treatment methods for acid-containing wastewater and waste iron in the organic synthesis industry.

Method used

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  • Comprehensive treatment method for organic acid-containing wastewater and iron mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The organic acid-containing wastewater produced during the production of T acid has a sulfuric acid content of 30% and COD=4400mg / L; the iron sludge produced is washed with water twice the weight of the iron sludge, and the water content of the iron sludge is measured to be 17%, and the iron sludge contains Fe 2 o 3 80% (based on the quality of dry iron mud).

[0034] 1. Acid soluble

[0035] Slowly add clean and moist iron mud to organic acid-containing wastewater. When the pH of the system is around 2, stop adding iron mud. The amount of iron mud added is 29% (based on the quality of organic acid-containing wastewater), and the reaction The liquid temperature was 55°C.

[0036] 2. Restore

[0037]Slowly add scrap iron scraps to the acid-dissolved wastewater, and at the same time add 50g / L activated carbon powder, stir the reaction and monitor the pH of the solution online, adjust the pH with organic acid-containing wastewater, and keep the pH at about 4. Add 45% o...

Embodiment 2

[0047] Same as the other operating steps in Example 1, only when the cooling crystallization temperature in step 4 was changed to 15°C, the purity of the recovered heptahydrate and ferrous sulfate was increased to 94.5%.

Embodiment 3

[0049] The organic acid-containing wastewater produced during the production of the reduced product (2-amino-4-acetamidoanisole), the content of sulfuric acid is 31%, and the COD=12500mg / L; the iron sludge produced is washed with water with an iron sludge quality of 60% , the water content of the iron mud was measured to be 19%, containing Fe 2 o 3 80%.

[0050] 1. Acid soluble

[0051] Slowly add clean and moist iron sludge to the organic acid-containing wastewater. When the pH of the system is around 1, the amount of iron sludge added is 25% (based on the quality of the organic acid-containing wastewater), and the temperature of the reaction solution is 50°C.

[0052] 2. Restore

[0053] Slowly add scrap iron scraps to the acid-dissolved wastewater, and at the same time add 3g / L activated carbon powder, stir the reaction and monitor the pH of the solution online, and adjust the pH with organic acid-containing wastewater. Keep the pH around 4. When adding 55% of scrap ir...

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Abstract

The invention discloses a comprehensive treatment method for organic acid-containing wastewater and iron mud. The comprehensive treatment method comprise the steps of firstly, adding iron mud into organic acid-containing wastewater, reacting by stirring at the temperature of 40-70 DEG C until the pH value is up to 0.5-3, and then, stopping adding the iron mud; then, adding waste scrap iron and active carbon powder, reacting by stirring, stopping adding until trivalent iron is completely reduced, keeping the pH value of the solution at 1-5, and filtering to obtain a supernatant solution I; and treating the supernatant solution I through the steps (3-a) and (3-b) according to any sequence to obtain a treating solution, and then, recycling iron sulfate heptahydrate through cooling crystallization, wherein the step (3-a) is realized by filtering by using an ultrafiltration membrane and/or carrying out adsorption treatment by using naphthalenesulfonic acid resin, and the step (3-b) is realized by filtering after adsorbing by using an adsorbent. The comprehensive treatment method disclosed by the invention can be used for realizing comprehensive treatment on solid wastes and liquid wastes through mixing the organic acid-containing wastewater and the iron mud generated in the same product production process, can also be used for recycling high-purity iron sulfate heptahydrate and is simple in process, low in treatment cost and easy to popularize.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater, in particular to a comprehensive treatment method for organic acid-containing wastewater and iron sludge. Background technique [0002] H acid is an important dye intermediate. In industrial production, H acid is prepared from refined naphthalene and oleum through sulfonation-adding nitric acid nitration-denitration-neutralization-reduction-salting-out-dissolution-alkali fusion-isolation . Excessive sulfuric acid is added in the sulfonation process to produce sulfuric acid wastewater; reduced iron powder is used as the reducing agent in the reduction process to produce a large amount of iron sludge. [0003] 4,4-Diaminodiphenylamine-2-sulfonic acid, commonly known as p-p-acid or PP acid, is an important dye intermediate. It is obtained from the sulfonation product of p-nitrochlorobenzene and the reduction product of p-nitroaniline through condensation-reduction. During the sulfona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01G49/14
Inventor 陈磊张静刘仲明杨文莲陈丽娜沈振雄章金骏
Owner ZHEJIANG QICAI ECO TECH CO LTD
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