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A kind of wastewater treatment method containing benzoic acid

A wastewater treatment and benzoic acid technology, which is applied in multi-stage water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of failure to meet the chroma removal standard, high operation requirements of liquid membrane method, and failure to save energy Cost and other issues, to achieve the effect of shortening biochemical time, minimizing cost, and reducing processing equipment

Active Publication Date: 2022-03-08
四川恒泰环境技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: the solvent extraction method has solvent loss, requires secondary treatment, and the process is cumbersome; the adsorbent needs to be regenerated in the adsorption method, and the regeneration equipment is huge and expensive; the liquid film method has high requirements for operation and is unstable, and even causes secondary Disadvantages such as secondary pollution; usually, the treatment method of benzoic acid wastewater is neutralization reaction, and then enters the biochemical system, but the biochemical reaction needs to control the concentration of inorganic salts. In order to dilute the salt, it is necessary to add dilution water to be more than 10 times the amount of wastewater, so the follow-up treatment The cost has been greatly increased, and the goal of cost saving has not been achieved; for the chroma of benzoic acid wastewater, the traditional process using the electric Fenton method cannot achieve the final chroma removal standard, so technical innovation and transformation are ultimately required

Method used

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  • A kind of wastewater treatment method containing benzoic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the measurement, the COD in the wastewater containing benzoic acid to be treated is 7142mg / L, the BOD is 1051mg / L, the chroma is above 10000, it is dark red, the salt content is 98500mg / L, the pH value is 1.3, and it contains a small amount of total nitrogen.

[0036] Adopt a kind of wastewater treatment method that contains benzoic acid provided by the invention to process above-mentioned wastewater containing benzoic acid, concrete steps are as follows:

[0037] The wastewater containing benzoic acid to be treated is introduced into the regulating tank, and the residence time is 1.5 hours; the treated wastewater is introduced into the bag filter to remove the tiny suspended matter and flocculation sediment in the wastewater; the effluent of the bag filter is introduced into the reducing The steam acid system is used for pressure return, the salt content is 19900mg / L, and the salt content is reduced by about 80000mg / L; it is directly sent to the reaction po...

Embodiment 2

[0039] According to the measurement, the COD in the wastewater containing benzoic acid to be treated is 8031mg / L, the BOD is 1202mg / L, the chroma is above 10000, it is dark red, the salt content is 99800mg / L, the pH value is 1.1, and it contains a small amount of total nitrogen.

[0040] Adopt a kind of wastewater treatment method that contains benzoic acid provided by the invention to process above-mentioned wastewater containing benzoic acid, concrete steps are as follows:

[0041] The wastewater containing benzoic acid to be treated is introduced into the regulating tank, and the residence time is 1.8 hours; the treated wastewater is introduced into the bag filter to remove the tiny suspended matter and flocculation sediment in the wastewater; the effluent from the bag filter is introduced into the reducing The acid steaming system is used for pressure return, the salt content is 20500mg / L, and the salt content is reduced by about 80000mg / L; it is directly sent to the reacti...

Embodiment 3

[0043] According to the measurement, the COD in the wastewater containing benzoic acid to be treated is 7850mg / L, the BOD is 1138mg / L, the color is above 10000, it is dark red, the salt content is 98900mg / L, the pH value is 1.2, and it contains a small amount of total nitrogen.

[0044] Adopt a kind of wastewater treatment method that contains benzoic acid provided by the invention to process above-mentioned wastewater containing benzoic acid, concrete steps are as follows:

[0045] The wastewater containing benzoic acid to be treated is introduced into the regulating tank, and the residence time is 1.6 hours; the treated wastewater is introduced into the bag filter to remove the tiny suspended matter and flocculation sediment in the wastewater; the effluent from the bag filter is introduced into the reducing The steam acid system is used for pressure return, the salt content is 20000mg / L, and the salt content is reduced by about 80000mg / L; it is directly sent to the reaction t...

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Abstract

The invention discloses a method for treating wastewater containing benzoic acid. The benzoic acid wastewater is treated through a regulating tank-filter-decompression recycling acid distillation system-Fenton and coagulation system-biochemical oxidation process-ozone oxidation process, Efficiently remove high-indicator pollutants such as refractory organic matter, inorganic salts, and chroma in wastewater. After final treatment, the COD of the effluent is ≤100mg / L, the chroma of the effluent is ≤75, and the pH range of the effluent is 6-9.

Description

technical field [0001] The invention belongs to the technical field of chemical wastewater treatment, and in particular relates to a wastewater treatment method containing benzoic acid. Background technique [0002] Benzoic acid is an important organic chemical raw material, which is widely used in medicine, food, chemical industry and so on. With the rapid development of industry and agriculture, some production will produce a large amount of benzoic acid acid wastewater, the composition of the wastewater is complex, containing a large amount of nitric acid, inorganic salts, organic matter, etc. In these productions, manufacturers will add a large amount of nitric acid, so nitric acid is a necessary additive in production. The content of benzoic acid in this type of wastewater is about 1-2%. Such a high content of benzoic acid has a serious impact on the biological treatment of wastewater. It poses great harm to the survival of animals, plants and human beings, especially ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/34
CPCC02F9/00C02F2101/34C02F1/001C02F1/048C02F1/5245C02F1/56C02F1/722C02F1/725C02F1/78C02F2305/02C02F2305/026C02F3/02C02F3/28C02F3/30C02F2301/08
Inventor 巩惠月杨汉军刘星黄莉范星罗阳唐俊敬茂军
Owner 四川恒泰环境技术有限责任公司
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