Wastewater treatment method of fluorine-containing aniline compounds

A technology for treating fluorine-containing aniline and wastewater, which is applied in the fields of special compound water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of few treatment technology reports and difficult treatment, and achieve easy realization, thorough treatment, Obvious effect

Inactive Publication Date: 2020-03-27
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the present situation that there are few reports on the treatment technology of fluorine-containing aniline compounds in the existing waste water containing fluorine-containing aniline compounds and the treatment is difficult, the present invention provides a wastewater treatment method for fluorine-containing aniline compounds, which is simple, easy to implement, and Fluoroaniline compounds are completely degraded, and the fluorine content can be reduced to below 10ppm

Method used

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  • Wastewater treatment method of fluorine-containing aniline compounds

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Effect test

Embodiment 1

[0043] Wastewater treatment route of the present invention such as figure 1 As shown, the specific steps are as follows:

[0044] 1) High temperature Fenton oxidation

[0045] Use dilute hydrochloric acid to adjust the pH of wastewater containing 2,6-difluoroaniline to 2, add ferrous sulfate heptahydrate to the wastewater at a ratio of 0.2%, stir to dissolve, keep the temperature at 70°C, and then drip while stirring Add hydrogen peroxide, the ratio of hydrogen peroxide consumption to COD is 7:1, and the entire oxidation reaction time is 3 hours.

[0046] 2) Dosing calcium hydroxide to remove fluoride

[0047] Add calcium hydroxide solution with a concentration of 20% to the oxidized wastewater, and the added quality is 4.5% of the wastewater volume. At this time, the pH of the wastewater is 9.6, and the calcium hydroxide is slightly excessive.

[0048] 3) Coagulation + coagulation aid

[0049] Add a PAC aqueous solution with a concentration of 10% to the wastewater. The d...

Embodiment 2

[0053] 1) High temperature Fenton oxidation

[0054] Use dilute hydrochloric acid to adjust the pH of wastewater containing 2,6-difluoroaniline to 3.2, add ferrous sulfate heptahydrate to the wastewater at a ratio of 0.3%, stir to dissolve, keep the temperature at 60°C, and then drip while stirring Add hydrogen peroxide, the ratio of hydrogen peroxide consumption to COD is 10:1, and the entire oxidation reaction time is 4.5h.

[0055] 2) Dosing calcium oxide to remove fluoride

[0056] Add a calcium oxide solution with a concentration of 30% to the oxidized wastewater, and the quality of the addition is 2.35% of the wastewater volume, and at the same time drop liquid alkali to adjust the pH of the wastewater to 8.7.

[0057] 3) Coagulation + coagulation aid

[0058] Add 10% polyferric sulfate (PFS) solution to the wastewater, the dosage of PFS solution is 3.5% of the wastewater volume, stir and mix well, let it stand for 6 minutes; then add dropwise the PAM aqueous solution ...

Embodiment 3

[0062] 1) High temperature Fenton oxidation

[0063] Use dilute hydrochloric acid to adjust the pH of wastewater containing 2,4-difluoroaniline to 4, add ferrous sulfate heptahydrate to the wastewater at a ratio of 0.43%, stir to dissolve, keep the temperature at 50°C, and then drip while stirring Add hydrogen peroxide, the ratio of hydrogen peroxide consumption to COD is 16:1, and the entire oxidation reaction time is 4 hours.

[0064] 2) Dosing calcium chloride to remove fluoride

[0065] Add a calcium chloride solution with a concentration of 40% to the oxidized wastewater, and the added quality is 1.8% of the wastewater volume, and adjust the pH of the wastewater to 8.3 with liquid alkali.

[0066] 3) Coagulation + coagulation aid

[0067] Add 10% PAC solution to the wastewater, the dosage of PAC solution is 3% of the wastewater volume, stir and mix well, let it stand for 5 minutes; then add dropwise PAM aqueous solution with a mass fraction of 1%, the dosage is about 0...

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Abstract

The invention discloses a wastewater treatment method of fluorine-containing aniline compounds. The wastewater treatment method comprises the steps of: carrying out high-temperature Fenton oxidation on wastewater containing fluorine-containing aniline compounds to convert organic fluorine in the wastewater into inorganic fluorine, and removing the inorganic fluorine in the wastewater. According tothe method, the COD and total nitrogen removal rate is high, the fluorine content after treatment is reduced to 10 ppm or below, the COD is reduced to about 2000 mg / L, the process is simple, implementation is easy, and the efficiency is high.

Description

technical field [0001] The invention relates to a method for treating industrial wastewater, in particular to a method for treating wastewater containing fluorine-containing aniline compounds, and belongs to the technical field of wastewater treatment containing organic fluorine. Background technique [0002] In the pesticide industry, such as florasulam, flumesulam, diflufenamide, and flumeflume propargyl, a large amount of wastewater containing fluoroaniline compounds will be produced during the production process, with a content of 0.1%~5 %, other organic components are 0.1~2%, and wastewater COD is 6000~50000mg / L. Because fluoroaniline compounds are refractory organic matter, and the total nitrogen content of wastewater is very high, it cannot be directly treated by biochemical treatment, and pretreatment is required to remove organic fluorine. Due to the small van der Waals radius and strong electronegativity (4.0) of the fluorine atom, the carbon-fluorine bond has a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14C02F101/36
CPCC02F9/00C02F1/722C02F2305/026C02F2101/36C02F2101/14C02F1/66C02F1/56C02F1/5236C02F2001/007
Inventor 袁良国李志清梁倩刘强连世鹏李盼盼孙健
Owner SHANDONG WEIFANG RAINBOW CHEM
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