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Advanced treatment method for production waste water of acrylic acid and ester device

A technology for production wastewater and advanced treatment, which is applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve problems such as accelerated membrane damage, high membrane cost, and easy clogging of reverse osmosis membranes. , to achieve the effect of improving biodegradability, improving treatment efficiency and load

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

However, due to the complex composition of the waste water from the acrylic acid and ester plant and the large fluctuations in the water quality composition during the production process, the reverse osmosis membrane is easily blocked, which accelerates the damage of the membrane, resulting in a huge cost of the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Acrylic acid used in the present embodiment and ester plant wastewater water quality situation Table 1:

[0026] Table 1 Water quality of wastewater from acrylic acid and ester plant

[0027] pH

[0028]Firstly, the wastewater from the acrylic acid and ester plant is dealdehydeized, the reaction temperature is controlled at 95°C, and alkaline earth metal (sodium hydroxide and calcium hydroxide ratio 1:2) is slowly added to adjust the pH of the system to 13, and the reaction time is 0.5h. Add coagulant polyferric sulfate 300mg / L to the effluent after dealdehyde treatment, residence time 5min, G value 550S -1 , add 3mg / L coagulant PAM, the velocity gradient is 200S -1 Weaken to 20S -1 , hydraulic retention time 20min, solid-liquid separation time 0.5h. After the wastewater is pretreated, the organic load of the influent is controlled to be 12.0kgCOD Cr / m 3 d, using two-stage EGSB (granular sludge property parameters 57-69gVSS / L, particle size 0.2-5.0mm, pH...

Embodiment 2

[0033] Table 3 between the acrylic acid and ester plant waste water quality situation that adopts in the present embodiment:

[0034] Table 3 Water quality of wastewater from acrylic acid and ester plant

[0035] pH

COD Cr

TOC

BOD 5

B / C

formaldehyde

Total aldehyde

3.9

35217

14972.0

23

0.0015

6512

7891

[0036] Firstly, the wastewater from the acrylic acid and ester plant is dealdehydeized, the reaction temperature is controlled at 45°C, and alkaline earth metal (sodium hydroxide and calcium hydroxide ratio 1:2) is slowly added to adjust the pH of the system to 13, and the reaction time is 12h. Add coagulant polyferric sulfate 300mg / L to the effluent after dealdehyde treatment, residence time 5min, G value 550S -1 , add 3mg / L coagulant PAM, the velocity gradient is 200S -1 Weaken to 20S -1 , hydraulic retention time 20min, solid-liquid separation time 0.5h. After the wastewater is pretr...

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Abstract

The invention discloses an advanced treatment method for production waste water of an acrylic acid and ester device, belonging to the technical field of treatment of organic waste water. A combined treatment process consisting of aldehyde removing treatment, coagulating and depositing two-section pretreatment, anaerobic treatment, aerobic biological secondary treatment, ozone catalytic oxidation and active carbon advanced treatment is adopted, so that the problem of advanced treatment of the production waste water of the acrylic acid and ester device is solved, and effluent can reach a national first class discharge standard of Comprehensive Sewage Discharge Standard (GB8978-96). In the combined process, biological treatment is taken as a main body, so that treatment cost on waste device of the acrylic acid and ester device can be reduced greatly.

Description

technical field [0001] The invention relates to the field of organic wastewater treatment, in particular to an advanced treatment method for wastewater produced by an acrylic acid and ester plant. Background technique [0002] Acrylic acid and ester production wastewater is a high-concentration organic industrial wastewater, chemical oxygen demand (COD Cr ) is generally 30000-50000mg / L, showing strong acidity, mainly containing acetic acid (3.0-6.0%), acrylic acid and esters (0.02-3.0%), formaldehyde (0.04-4%), toluene and other organic substances (0-2 %), there are a large number of refractory and toxic and harmful pollutants, and the treatment is extremely difficult. The methods currently reported mainly include advanced oxidation methods (incineration and wet catalytic oxidation methods), component recovery methods (membrane separation methods), and biodegradation methods (biological methods, electrolysis-biological combination methods, steam stripping-biological combina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F103/36C02F9/14
Inventor 顾锡慧郑书忠田建军滕厚开陈军张艳芳李立峰官赟赟王昊
Owner CHINA NAT OFFSHORE OIL CORP
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