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Biochemical treatment method for acrylic acid and ester production wastewater

A technology for biochemical treatment and production of wastewater, applied in the field of water treatment, can solve problems such as large fuel gas consumption, incinerator corrosion, and increased operating costs, and achieve the effects of improving biodegradability, catalytic performance, and large electrode surface area

Inactive Publication Date: 2020-04-07
PINGHU PETROCHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal incineration process requires a large investment in infrastructure, consumes a large amount of fuel gas or fuel oil, and has high energy consumption and operating costs. Moreover, wastewater such as acrylate usually contains high concentrations of sodium salts, which is likely to cause corrosion of the incinerator, and furnace bricks need to be replaced regularly. , which further increases the running cost
(2) Biological treatment is carried out after a large amount of dilution. The load of the biological treatment system is low, the area is large, and it is easy to be impacted, and the quality of the effluent is unstable.
Patents CN1546453A, CN1249739A, and CN1683309A proposed a variety of methods for recovering acrylic acid from the water absorption solution (high-concentration acrylic acid solution) of propylene oxidation gas, but there is no method for acrylate wastewater with low concentration of acrylic acid (<5%) and high-concentration acrylic acid. Efficient method for acrylic acid treatment under salt conditions

Method used

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  • Biochemical treatment method for acrylic acid and ester production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A biochemical treatment method for acrylic acid and ester production wastewater, the process flow diagram is as follows figure 1 As shown, the specific process is as follows:

[0025] (1) In the acrylic acid production process, the waste water containing acrylic acid obtained during the two-step oxidation of propylene, quenching absorption, purification and separation is recorded as acid waste water A;

[0026] (2) The water produced by the reaction of acrylic acid and butanol, the process water used to extract the catalyst, and the ester-containing wastewater produced by vacuum distillation are mixed and recorded as ester wastewater B. After the ester wastewater B is treated with a filtration and concentration device, concentrated wastewater C and Dilute waste water D after filtration;

[0027] (3) Concentrated waste water C and acid waste water A are mixed, and after electro-Fenton treatment and filtered diluted waste water D is mixed into waste water E to enter the ...

Embodiment 2

[0032] A kind of biochemical treatment method of acrylic acid and ester production waste water, concrete process is the same as embodiment 1, difference is:

[0033] The initial COD of acid wastewater A is 85000mg / L, and the pH value is 3.5;

[0034] The initial COD of ester wastewater B is 83000mg / L, and the pH value is 8.5. After membrane concentration, the COD of concentrated wastewater C is 250000mg / L, and the pH value is 8.7. The COD of diluted wastewater D after filtration is 4600mg / L, and the pH value is It is 4.5, concentrated wastewater C and acid wastewater A are mixed and passed through an electric Fenton voltage of 10V. During the treatment process, hydrogen peroxide with a concentration of 3.14 mmol / L is added for treatment with an electric Fenton device, and then mixed with filtered diluted wastewater D, COD It is 25000mg / L, the pH value is 6.1, and it enters the biochemical process for treatment.

Embodiment 3

[0036] A kind of biochemical treatment method of acrylic acid and ester production waste water, concrete process is the same as embodiment 1, difference is:

[0037] The initial COD of acid wastewater A is 92000mg / L, and the pH value is 4.2;

[0038] The initial COD of ester wastewater B is 85,000 mg / L, and the pH value is 9.0. After membrane concentration, the COD of concentrated wastewater C is 270,000 mg / L, and the pH value is 9.3. After filtration, the COD of diluted wastewater D is 5,100 mg / L, and the pH value is It is 5.2. After the concentrated wastewater C and the acid wastewater A are mixed, the voltage of the electro-Fenton is 10V. During the treatment, hydrogen peroxide with a concentration of 3.14 mmol / L is added to the electro-Fenton device for treatment, and then mixed with the diluted wastewater D after filtration, the COD It is 24000mg / L, the pH value is 5.8, and it enters the biochemical process for treatment.

[0039]The electric Fenton anode of the present ...

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Abstract

Belonging to the technical field of water treatment, the invention relates to a biochemical treatment method for acrylic acid and ester production wastewater. The biochemical treatment method for acrylic acid and ester production wastewater includes the steps of: (1) carrying out quenching absorption and purification separation on propylene subjected to two-step oxidation in the acrylic acid production process to obtain acrylic acid-containing wastewater denoted as acid wastewater A; (2) mixing the water generated by reaction of acrylic acid and butanol, process water for catalyst extraction and ester-containing wastewater generated by vacuum rectification to obtain ester wastewater B, and treating the ester wastewater B by a filtering and concentration device to obtain concentrated wastewater C and filtered diluted wastewater D respectively; and (3) mixing the concentrated wastewater C and the acid wastewater A, performing electro-Fenton treatment, then conducting mixing with the filtered diluted wastewater D to form wastewater E, sending the wastewater E into a biochemical treatment process for treatment, and then conducting up-to-standard discharge. The wastewater treated by themethod disclosed by the invention can reach the second-level sewage discharge standard.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a biochemical treatment method for acrylic acid and ester production wastewater, and belongs to the technical field of water treatment. Background technique [0002] Acrylate is an extremely important basic raw material and intermediate in modern chemical industry. It is used in adhesives, coatings, plastics, textiles, papermaking, leather, elastomers, printing, synthetic fibers, building materials, super absorbent resins, boiler anti-scaling, flocculants , Auxiliary industry, detergent industry and many other fields are widely used. [0003] The wastewater discharged from the acrylate production plant usually has the characteristics of high salt content, high organic concentration, high toxicity, and difficult treatment. The total dissolved solids (TDS) reaches 50-120 g / L, and the chemical oxygen demand (COD) reaches 30000~90000mg / L. The main pollutants in the waste water are s...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/34
CPCC02F1/44C02F1/4672C02F1/66C02F1/725C02F3/30C02F9/00C02F2101/34
Inventor 高军杨卫东洪日寇亮范昌海杨为国石露马跃贾明周云剑江波李亚萍
Owner PINGHU PETROCHEM
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