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Comprehensive treatment method for high-concentration aldehyde acrylic wastewater

A technology for comprehensive treatment of aldehyde-containing acrylic acid, which is applied in the field of comprehensive treatment of high-concentration aldehyde-containing acrylic acid wastewater, can solve problems such as affecting biological treatment effect, microbial damage, poisoning, etc., and achieves improved biodegradability, good adaptability and stability. , the effect of a wide range of applications

Active Publication Date: 2012-06-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-concentration aldehyde-containing acrylic acid wastewater will harm or cause poisoning to microorganisms, thereby affecting the biological treatment effect, so the biochemical method with low operating costs can only treat low-concentration aldehyde-containing wastewater

Method used

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  • Comprehensive treatment method for high-concentration aldehyde acrylic wastewater
  • Comprehensive treatment method for high-concentration aldehyde acrylic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Taking the acrylic acid wastewater from a factory as the target treatment water for experimental application, the wastewater was firstly analyzed for aldehydes, and it was divided into two categories based on whether it contained α-H. The analysis results showed that the aldehydes containing α-H The content is greater than the content of the two types of aldehydes that do not contain α-H. The specific water quality is shown in Table 1:

[0017] Control the reaction temperature at 95°C, slowly add alkaline earth metal (sodium hydroxide and calcium hydroxide ratio 1:2) to adjust the system pH=13, and the reaction time is 0.5h. After the dealdehyde treatment, the pH of the wastewater was adjusted to 7.0, and the UASB-ASP two-stage biological method was used for treatment. The treatment effects of each unit are listed in Table 2:

[0018] Table 1 Water quality table of raw water

[0019]

[0020] Table 2 process treatment effect

[0021]

[0022] It can be se...

Embodiment 2

[0024] Select the actual high-concentration aldehyde-containing acrylic acid wastewater from a certain company for process research. First, conduct a full analysis of aldehydes in the wastewater, and divide them into two categories based on whether they contain α-H. For specific water quality, see Table 3 below:

[0025] Table 3 Water quality of raw water

[0026]

[0027] Control the reaction temperature at 60°C, and slowly add sodium hydroxide to adjust the pH of the system to 10. After a reaction time of 5 hours, the residual total aldehyde content in the wastewater is detected to be 29.9 mmol, and the molar ratio of residual aldehyde to calcium hydroxide is 3:1. , control the reaction temperature to 50°C, and the reaction time to 6h. The specific process treatment effect is shown in Table 4:

[0028] Table 4 combined process treatment effect

[0029] Effluent water quality analysis

[0030] It can be seen from the above table that after dealdehyde treatment,...

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Abstract

The invention provides a comprehensive treatment method for high-concentration aldehyde acrylic wastewater. The method is characterized in that alkaline metal or alkaline-earth metal hydroxide is adopted according to the relative contents of two types of aldehyde in acrylic wastewater, wherein one type of aldehyde contains Alpha-H, and the other does not contain Alpha-H; one or more additives including sodium hydroxide, calcium hydroxide and potassium hydroxide are selected, and the additives are metered in the form of hydroxide and are de-aldehyded under the condition of high temperature. After treatment, the biotoxicity of the acrylic wastewater is greatly reduced, and the acrylic wastewater is further treated through an anaerobic-aerobic combination biological method to ensure that outlet water can comply with the Grade-III emission standard of the national stipulation about comprehensive discharge standard of sewage (GB 8978-1996), so that comprehensive control of high-concentration aldehyde acrylic wastewater can be realized.

Description

technical field [0001] The invention belongs to the technical field of refractory organic wastewater treatment, in particular to a method for comprehensively treating high-concentration aldehyde-containing acrylic acid wastewater. Background technique [0002] So far, no natural sources of aldehyde pollutants in water have been found. The aldehyde pollutants in water are mainly caused by human production activities. The aldehydes in water mainly come from printing and dyeing, pharmaceutical, pesticide production, chemical and other enterprises. discharged waste water. Aldehyde-containing wastewater is a kind of refractory organic wastewater. The composition of aldehyde-containing wastewater is complex, and may include a variety of aldehyde organic substances at the same time. It is currently known that aldehydes have mutagenic and carcinogenic effects. The most common formaldehyde-containing wastewater and the most harmful to the environment contains high-concentration form...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 滕厚开顾锡慧李立峰张兴春官赟赟王昊隋云乐张永伟
Owner CHINA NAT OFFSHORE OIL CORP
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