Method for treating wastewater with benzoic acid

A wastewater treatment and benzoic acid technology, applied in the field of water treatment, can solve problems such as increasing wastewater COD, affecting the purity of sodium chloride, etc., and achieving the effect of reducing the content of benzoic acid

Inactive Publication Date: 2017-09-19
江苏强盛功能化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mother liquor obtained by this method contains a small amount of benzoic acid, and the residual benzoic acid will enter the sodium chloride, affecting the purity of sodium chloride.
[0004] Since benzoic acid has a certain solubility in water, the residual benzoic acid cannot be effectively removed by acidification
In addition, because the chemical structure of benzoic acid is relatively stable, it is often difficult to treat it by biodegradation methods. If the wastewater containing benzoic acid is directly introduced into the wastewater treatment system, the COD in the wastewater will increase after entering the wastewater treatment system. No small bur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In 1000kg of BPO washing water, the mass % specific concentration of benzoic acid is 0.056% (COD is 1028mg / L), 0.264kg of ferric chloride solid is added, the pH is adjusted to 3.6 with sodium bicarbonate, and 0.1kg of activated carbon is added for filtration. The mass % specific concentration of benzoic acid in the solution, that is, the filtrate is 0.019%, and the COD is 411 mg / L, and the filtrate is led to the subsequent water treatment system for treatment.

Embodiment 2

[0018] In 1000kg of BPO washing water, the mass % specific concentration of benzoic acid is 0.35% (COD is 7002 mg / L), 1.95 kg of iron sulfate is added, the pH is adjusted to 3.5 with a mass % specific concentration of 32% sodium hydroxide solution, and activated carbon is added 1kg suction filtration, the mass % specific concentration of benzoic acid in the obtained filtrate was 0.018%, the COD was 431mg / L, and the filtrate was led to the subsequent water treatment system for treatment.

Embodiment 3

[0020] After acidification and distillation treatment of 1000kg of TBPB strong alkaline production wastewater, the mass % specific concentration of benzoic acid is 0.15% (COD is 3050 mg / L), 0.88 kg of iron nitrate is added, and the pH is adjusted with a sulfuric acid solution with a mass % specific concentration of 50%. To 4, add 0.5kg of activated carbon for suction filtration, the mass % specific concentration of benzoic acid in the obtained filtrate is 0.02%, and the COD is 405mg / L, and the filtrate is led to the subsequent water treatment system for treatment.

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PUM

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Abstract

The invention discloses a method for treating wastewater with benzoic acid and belongs to the technical field of water treatment. The method comprises the following steps: firstly, adding an iron ion additive into wastewater with benzoic acid, adjusting the pH value to be weak acidity by using chemicals, further adding activated carbon, performing filtering separation so as to obtain a filtered liquid of which the content of the benzoic acid is reduced, and introducing a transition liquid into a later water treatment system for treatment. As the iron ion additive is adopted to complex the benzoic acid, and the activated carbon is added for filtering separation, the content of the benzoic acid in the wastewater is remarkably reduced, the treatment burden of the later water treatment system is alleviated, the treatment cost is lowered, and the environment can be protected.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for treating wastewater containing benzoic acid. Background technique [0002] The wastewater containing benzoic acid mentioned above mainly refers to, but is not limited to, the wastewater generated in the process of preparing organic peroxides or other chemical products from benzoyl chloride. Along with the development of industry, more and more manufacturers prepare the aforementioned organic peroxides and other chemicals by benzoyl chloride, and the waste water containing benzoic acid produced thereupon also increases accordingly, for example in the production of dibenzoyl peroxide ( In the process of BPO (hereinafter referred to as BPO), a small amount of benzoic acid is contained in the washing water produced by washing the crude BPO after the crude product of BPO is synthesized; The pH of the alkali washing water obtained after washing is adju...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/34
CPCC02F1/00C02F1/001C02F2101/34
Inventor 应志耀陈丹应立顾屹立
Owner 江苏强盛功能化学股份有限公司
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