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H acid waste water treatment method

A treatment method and wastewater technology, which are applied in the fields of energy wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of complex operation, poor treatment effect and high cost of high-concentration H acid wastewater , to achieve the effect of simple process, fast response process and low cost

Active Publication Date: 2016-01-13
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The publication number is CN101723489A, and the patent name is "A Sunlight / Electricity-Fenton Chemical Treatment Method for Dye Intermediate H-Acid Wastewater", which provides the treatment of H-acid wastewater by "utilizing solar power to generate electricity, and then electrolyzing the waste liquid" , this method requires special solar power generation equipment, the cost is relatively high, the operation is relatively complicated, and the treatment effect on high-concentration H-acid wastewater is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] H acid wastewater, black red, pH 2, COD=20000mg / L.

[0049] (1) Preheat the H-acid wastewater to 35°C, adjust the pH to 2.7 with liquid caustic soda (30% in mass fraction), then add 0.5% ferrous sulfate (based on the quality of H-acid wastewater), and gradually add mass The fraction is 30% hydrogen peroxide, control the temperature at 60°C, stir and react, the mass of hydrogen peroxide added is 7% (based on the quality of H acid wastewater), after adding hydrogen peroxide within 4 hours, keep warm and stir for 30 minutes to obtain oxidation treatment solution, the pH was kept at 2.7 during the reaction.

[0050] At the end of the reaction, the waste water changed from black red to bright yellow, COD=1600mg / L, and the COD removal rate was about 91%.

[0051] (2) Add calcium oxide (lime) to the oxidation treatment solution obtained in step (1), adjust the pH to 9, stir and flocculate for 1 hour, and filter.

[0052] The obtained filtrate is almost colorless, COD=330mg / L...

Embodiment 2

[0055] The H acid wastewater described in embodiment 1 is processed as follows:

[0056] (1) regulate the pH of H acid wastewater to 2.7 with liquid caustic soda (massfraction is 30%), add 0.5% ferrous sulfate (with H acid wastewater quality as benchmark) then, add massfraction gradually and be 30% hydrogen peroxide, control The temperature is 50°C, the reaction is stirred, the total amount of hydrogen peroxide added is 7% (based on the quality of H acid wastewater), the hydrogen peroxide is added after 6 hours, and then kept stirring for 30 minutes to obtain an oxidation treatment solution. During the reaction, keep the pH at 2.7 .

[0057] At the end of the reaction, the waste water changed from black red to bright yellow, COD=3000mg / L, and the COD removal rate was about 84%.

[0058] (2) Add calcium oxide (lime) to the oxidation treatment solution obtained in step (1), adjust the pH to 9, stir and flocculate for 1 hour, and filter.

[0059] The obtained filtrate is slight...

Embodiment 3

[0062] H acid wastewater, black red, pH 1.0, COD=32000mg / L.

[0063] (1) regulate the pH of H acid wastewater to 2.7 with liquid caustic soda (massfraction is 30%), add 0.5% ferrous sulfate (with H acid wastewater quality as benchmark) then, add massfraction gradually and be 30% hydrogen peroxide, control The temperature is 50°C, the reaction is stirred, the total amount of hydrogen peroxide added is 12% (based on the quality of H acid wastewater), the hydrogen peroxide is added after 6 hours, and then incubated and stirred for 30 minutes to obtain an oxidation treatment solution. During the reaction, keep the pH at 2.7 about.

[0064] At the end of the reaction, the waste water changed from black red to red, COD=5000mg / L, and the COD removal rate was about 82%.

[0065] (3) Add calcium oxide (lime) to the oxidation treatment solution obtained in step (1), adjust the pH to 9, stir and flocculate for 1 hour, and filter.

[0066] The obtained filtrate is slightly yellow, COD=8...

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Abstract

The invention discloses an H acid waste water treatment method. The method includes the steps that 1, the pH of H acid waste water is adjusted to 2-4, then ferric salt or ferrous salt is added, after the temperature is raised to 40-60 DEG C, hydrogen peroxide is added, and a Fenton oxidation reaction is conducted; 2, the pH of a product of the Fenton oxidation reaction is adjusted to 8.5-11, flocculation and filtration are conducted sequentially, and treatment is completed. In step 1, the pH of the H acid waste water is adjusted to 2.5-3.5, the adding amount of the ferric salt or the ferrous salt is 0.2-2% the mass of the H acid waste water, the mass fraction of the hydrogen peroxide is 27-30%, and the adding amount of the hydrogen peroxide is 2-20% the mass of the H acid waste water. The H acid waste water treatment method is simple in procedure, low in cost and suitable for being applied and popularized in industry.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating H-acid wastewater. Background technique [0002] H acid is an important dye intermediate used in the production of reactive dyes, acid dyes or azo dyes. During the production of H acid, the wastewater produced in the acid analysis step has the characteristics of high chroma, high salinity, high COD, and low B / C value, which has always been a difficult problem in the field of wastewater treatment. The most commonly used treatment methods are extraction method and wet oxidation method. The former is complex in operation, high in operating costs, and occupies a large area of ​​processing equipment; the latter is relatively simple in operation, but high in cost and dangerous in operation. [0003] In addition, in the invention patent document CN101104533 "a treatment method for H acid production wastewater" and the invention patent document CN10106...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C07C303/44C07C309/50C02F101/38
CPCY02W10/37
Inventor 张仲平吴小亮翁佳明陈磊李学坤张静
Owner ZHEJIANG QICAI ECO TECH CO LTD
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