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Resourceful treatment method of benzohydroxamic acid production wastewater

A technology for benzhydroxamic acid and wastewater production, applied in biological water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve problems such as difficult microbial degradation, waste of resources, and increased treatment costs, and achieve Improve the BOD5/COD value, reduce the cost of wastewater treatment, and effectively recycle and utilize the effect

Pending Publication Date: 2021-12-17
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (3) The pH value is too high, and if it is neutralized, a large amount of acid and alkali needs to be consumed;
[0006] (4) The components in the wastewater are single, the nutrient source is insufficient, and it is difficult to cultivate microorganisms;
[0007] (5) The concentration of benzohydroxamic acid in wastewater is 0.5-1.5%, so it has certain biological toxicity and is difficult to be degraded by microorganisms
However, for high-concentration and refractory benzhydroxamic acid chemical wastewater, direct biochemical treatment is not only inefficient, but also requires a large amount of water for dilution treatment, which greatly increases the treatment cost
What's more, the waste water may lead to the direct death of the bacterial species of the biochemical method, and there is no obvious change before and after the waste water treatment
Moreover, the current treatment method only treats the wastewater to meet the discharge standard, and does not consider the recycling of resources, resulting in the waste of some resources

Method used

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  • Resourceful treatment method of benzohydroxamic acid production wastewater
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  • Resourceful treatment method of benzohydroxamic acid production wastewater

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Effect test

Embodiment 1

[0032] The concentration of benzohydroxamic acid in the benzohydroxamic acid production wastewater treated in this embodiment was 12.46 mg / mL (approximately 1.26% by mass), and the pH value was 1.

[0033] The processing procedure of the present invention comprises:

[0034] (1) Get 100.00 g of benzohydroxamic acid production wastewater, mix 15.00 g of macroporous strongly basic anion exchange resin (purchased) with 100.00 g of benzohydroxamic acid production wastewater; stir at a temperature of 10° C. for 5 min, Obtain loaded resin and residual water phase; BOD of wastewater from the production of former benzohydroxamic acid 5 / COD is 0.10, the BOD of the residual water phase after distillation and desalination 5 / COD is 0.45;

[0035] (2) Use 20.0 mL of 15% sodium hydroxide solution to desorb the loaded resin at a desorption temperature of 60° C. to fully desorb to obtain the regenerated resin and benzhydroxamic acid enrichment solution; the regenerated resin is recycled. ...

Embodiment 2

[0042] The benzhydroxamic acid production waste water that the present embodiment handles is the same as embodiment 1.

[0043] The processing procedure of the present invention comprises:

[0044] (1) Take 100.00 g of benzohydroxamic acid production wastewater, adjust its pH to 3, and mix 20.00 g of macroporous weakly basic styrene anion exchange resin (purchased) with 100.00 g of benzohydroxamic acid production wastewater ;Stir at a temperature of 20°C for 10 minutes to obtain the loaded resin and the residual water phase; the BOD of the residual water phase after distillation and desalination 5 / COD is 0.47;

[0045] (2) Desorb the loaded resin with 30.0 mL of 15% potassium hydroxide solution at a desorption temperature of 50° C. to fully desorb to obtain the regenerated resin and benzhydroxamic acid enrichment solution; the regenerated resin is recycled.

[0046] After quantitative analysis by high performance liquid chromatography (HPLC (JY / T 024-1996)), the content of ...

Embodiment 3

[0052] The benzhydroxamic acid production waste water that the present embodiment handles is the same as embodiment 1.

[0053] The processing procedure of the present invention comprises:

[0054] (1) Take 100.00g of benzohydroxamic acid production wastewater, adjust its pH to 5, and mix 25.00g of macroporous weakly basic styrene anion exchange resin (purchased) with 100.00g of benzohydroxamic acid production wastewater ;Stir at a temperature of 30°C for 15min to obtain the loaded resin and the residual water phase; the BOD of the residual water phase after distillation and desalination 5 / COD is 0.49;

[0055] (2) Desorb the loaded resin with 40.0 mL of 15% ammonia solution at a desorption temperature of 40° C. to obtain the regenerated resin and benzhydroxamic acid enrichment solution; the regenerated resin is recycled.

[0056] After quantitative analysis by high performance liquid chromatography (HPLC (JY / T 024-1996)), the content of benzohydroxamic acid in the enriched...

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Abstract

The invention belongs to the technical field of wastewater treatment and utilization, and particularly discloses a resourceful treatment method of benzohydroxamic acid production wastewater. The resourceful treatment method of the benzohydroxamic acid production wastewater provided by the invention comprises the following steps: firstly, adding alkaline resin into the benzohydroxamic acid production wastewater, and carrying out sufficient adsorption to obtain loaded resin and a residual water phase; desorbing the loaded resin by using an eluent, and fully desorbing to obtain regenerated resin and a benzohydroxamic acid enriched solution. The obtained benzohydroxamic acid enriched solution is compounded to prepare the collecting agent which can be used for flotation of scheelite. According to the method disclosed by the invention, resource utilization of the benzohydroxamic acid production wastewater is realized, and the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment and utilization, in particular to a resource treatment method for wastewater produced by benzhydroxamic acid. Background technique [0002] Benzohydroxamic acid belongs to anionic surfactant, which has strong chelating ability to metal ions, and has been widely used in the field of mineral engineering. At present, the main method for the synthesis of hydroxamic acid is the hydroxylamine method, which is produced by oximation reaction of ester and hydroxylamine under alkaline conditions, and then acidified by sulfuric acid. Among them, the organic wastewater produced in the production of benzohydroxamic acid has the following characteristics: [0003] (1) The concentration is high, a large amount of reactants, products, and solvents remain in the wastewater, and the COD concentration is (5~20)×10 5 mg / L; [0004] (2) The salt content is high, and the concentration of inorganic salt ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/34
CPCC02F9/00C02F1/42C02F1/04C02F1/66C02F3/34C02F2101/34C02F2303/14
Inventor 李方旭张发明林日孝
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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