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Treatment method of acrylic acid production waste water

A technology for producing wastewater and treatment methods, which is applied in water/sewage treatment, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., and can solve the problems of complex equipment, operation process, high treatment cost, catalyst poisoning, etc. To achieve the effect of long processing time, low processing cost and efficient processing

Inactive Publication Date: 2007-04-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts have special requirements for wastewater quality: the wastewater contains inorganic ions (Na, Ca, Fe, etc.) must be less than 20mg / L, otherwise the catalyst will be permanently poisoned and cannot be used
This process belongs to high temperature, high pressure, and uses heavy metal catalyst, which requires complex equipment and operation process, high energy consumption and high treatment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, electrolyze the acrylic wastewater, adjust pH 5-6, control voltage 7-8V, current 20A, and electrolysis time 30min. For the acrylic wastewater after electrolysis, dilute the COD concentration to 8000mg / L, adjust the pH to 6.8-7.8, add phosphate to make the concentration 80mg / L and trace elements (μg / L): CoCl 2 ·6H 2 O(80), MnCl 2 ·4H 2 O(20), ZnCl 2 (2), NiCl 2 ·6H 2 O(2), (NH 4 ) 6 Mo 7 O 24 (3). Entering the anaerobic granular bed reactor, the properties and parameters of the granular sludge are: 60-68gVSS / L, 70-80gSS / L, and the particle size is 0.2-2.5mm. The hydraulic retention time of the wastewater in the reactor is 12h, the temperature in the reactor is maintained at room temperature (16-37°C), and the pH value is controlled at 6.8-7.8. The initial volume load of the anaerobic reactor is 0.1-0.5kgCOD / (m 3 d) When the COD removal rate reaches 85% and the operation is stable, gradually reduce the hydraulic retention time or increase the COD concen...

Embodiment 2

[0025] First, electrolyze acrylic wastewater, adjust pH 5-6, control voltage 7-8V, current 30A, and electrolysis time 25min. For the acrylic wastewater after electrolysis, dilute the COD concentration to 2000mg / L, adjust the pH to 6.8-7.8, add phosphate to make the concentration 20mg / L and trace elements (μg / L): CoCl 2 ·6H 2 O(70), MnCl 2 ·4H 2 O(10), ZnCl2 (4), NiCl 2 ·6H 2 O(4), (NH 4 ) 6 Mo 7 O 24 (5), entering the UASB reactor, the properties and parameters of the granular sludge are: 60-68gVSS / L, 70-80gSS / L, and the particle size is 0.2-2.5mm. The hydraulic retention time of the wastewater in the reactor is 18h, the temperature in the reactor is kept at room temperature (16-37°C), and the pH value is controlled at 6.8-7.8. The initial volume load of the anaerobic reactor is 0.1-0.5kgCOD / (m 3 d) When the COD removal rate reaches 85% and the operation is stable, gradually reduce the hydraulic retention time or increase the influent COD concentration to increase th...

Embodiment 3

[0027] First, electrolyze the acrylic wastewater, adjust pH 6-7, control voltage 8-9V, current 40A, and electrolysis time 10min. For the acrylic wastewater after electrolysis, dilute the COD concentration to 5000mg / L, adjust the pH to 6.5-7.8, add 50mg / L phosphate and trace elements (μg / L): CoCl 2 ·6H 2 O(60), MnCl 2 ·4H 2 O(30), ZnCl 2 (5), NiCl 2 ·6H 2 O(4), (NH 4 ) 6 Mo 7 O 24 (2), entering the 1C reactor (or EGSB), the properties of the granular sludge are: 60-68gVSS / L, 70-80gSS / L, particle size 0.2-2.5mm. The hydraulic retention time of the wastewater in the reactor is 10h, the temperature in the reactor is kept at room temperature (16-37°C), and the pH value is controlled at 6.8-7.8. The initial volume load of the anaerobic reactor is 0.1-0.5kgCOD / (m 3 d) When the COD removal rate reaches 85% and the operation is stable, gradually reduce the hydraulic retention time or increase the influent COD concentration to increase the load, until the wastewater is direct...

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Abstract

The present invention discloses a method for treating waste water produced by acrylic acid production, belonging to the field of organic waste water treatment technology. It includes the following main steps: firstly, electrolyzing said waste water, regulating pH value to 5-7, controlling voltage and making it b 8-9V, controlling current and making it be 20-40 A, electrolyzing time is 10-30 min; diluting the electrolyzed waste water to make COD concentration be 2000-8000 mg / L, regulating pH value to 6.5-8, then feeding said waste water into anaerobic reactor to make treatment, controlling COD concentration of waste water discharged from said anaerobic reactor and making it be 200-1000 mg / L, then making said waste water be fed into an aerobic reactor, its residence time is 18-28 h and organic load is 0.5-5 kg COD / (cu.m d), then said treated waste water can be directly discharged.

Description

technical field [0001] This patent relates to a treatment method for high-concentration organic wastewater, specifically a treatment method for acrylic acid production wastewater. Background technique [0002] Acrylic acid production wastewater is a high concentration organic industrial wastewater containing acrylic acid, unreacted raw materials such as propylene, by-products such as formaldehyde, acrolein, furfural, benzaldehyde, formic acid, acetic acid, maleic acid, acrylic acid dimer and additives such as polymerization inhibitor. Wastewater incineration device is currently the mainstream device for treating high-concentration acrylic acid (methacrylic acid) and its ester wastewater at home and abroad, catalytic wet oxidation device, these two sets of devices have good treatment effect, but high energy consumption. The biological treatment method disclosed by the patent CN 1600706 A costs one third of the waste water treatment cost of the incineration method, but the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/461C02F1/66C02F3/30
Inventor 任洪强丁丽丽洪宇宁
Owner NANJING UNIV
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