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Method for photocatalytic treatment of acrylate wastewater

An acrylate, photocatalytic technology, applied in chemical instruments and methods, light water/sewage treatment, natural water treatment, etc., can solve the problems of small molecular weight and difficult separation, and achieve easy separation, good sedimentation performance, and convenient operation. Effect

Active Publication Date: 2017-05-31
POTEN ENVIRONMENT GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the invention discloses a method for photocatalytically treating acrylate wastewater, which is used to solve the problem that macromolecular polymers such as polyacrylic acid produced by polymerization have small molecular weights and are difficult to separate from wastewater when treating acrylate wastewater

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0034] Initial indicators for acrylate wastewater: pH 13, COD Cr The content of sodium acrylate is 105000mg / L, and the content of sodium acrylate is 51000mg / L.

[0035] 1) Mix 0.3ml mass-volume concentration of 30% hydrogen peroxide aqueous solution and 100ml acrylate waste water, add photocatalytic polymerization reactor to carry out photocatalytic polymerization reaction, light source is KrF ultraviolet excimer laser, main output wavelength is 248nm, the single pulse energy of the laser is 350mJ, the pulse width is 30ns, the pulse frequency is 20Hz, the photocatalytic reaction time is 20min, and the reaction temperature is 25°C; the average molecular weight of polyacrylic acid and other polymers in the wastewater after the reaction is 12 million Daltons .

[0036] 2) Add 5ml of 100g / L calcium chloride aqueous solution to the effluent of the photocatalytic polymerization reactor, stir and react for 30min, and separate the precipitate by suction filtration to obtain the pretr...

Embodiment 2

[0039] Initial indicators for acrylate wastewater: pH 2, COD Cr It is 1100mg / L, and the content of acrylic acid is 650mg / L.

[0040]1) Mix 1ml of 10g / L potassium persulfate aqueous solution and 100ml of acrylate wastewater into a photocatalytic polymerization reactor for photocatalytic polymerization. The light source is a high-pressure mercury lamp, the main output wavelength is 254nm, the photocatalytic reaction time is 10min, and the reaction temperature The average molecular weight of polymers such as polyacrylic acid in the waste water after the reaction is 5 million Daltons.

[0041] 2) Add 1ml of 100g / L polyferric sulfate aqueous solution to the effluent of the photocatalytic polymerization reactor, stir and react for 120min, and after natural sedimentation to separate the precipitate, take the supernatant as the pretreated effluent.

[0042] Pretreatment effluent COD Cr is 246mg / L, acrylic acid content is 75mg / L, COD Cr The removal rate is 77.6%, the B / C ratio is 0....

Embodiment 3

[0044] Initial indicators of acrylate wastewater: pH 7, COD Cr It is 48000mg / L, and the content of acrylic acid is 25010mg / L.

[0045] 1) Mix 1ml of 30g / L ammonium persulfate aqueous solution and 100ml of acrylate wastewater into a photocatalytic polymerization reactor for photocatalytic polymerization. The light source is a high-pressure mercury lamp. The main output wavelength is 254nm. The average molecular weight of polymers such as polyacrylic acid in the waste water after the reaction is 9 million Daltons.

[0046] 2) Add 5ml of 100g / L aluminum sulfate aqueous solution to the effluent of the photocatalytic polymerization reactor, stir and react for 60min, and centrifuge to separate the precipitate to obtain the pretreated effluent.

[0047] Pretreatment effluent COD Cr is 8208mg / L, acrylic acid content is 205mg / L, COD Cr The removal rate is 82.9%, the B / C ratio is 0.61, and it can directly enter the biochemical system.

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Abstract

An embodiment of the invention discloses a method for treating acrylate wastewater through photocatalysis. The acrylate wastewater contains acrylic acid or sodium salt of the acrylic acid as the main organic constituent. The method comprises the following steps: the acrylate wastewater and an initiator are mixed and have a polymerization reaction in a photocatalytic reactor for 1-30 min at the temperature of 5-95 DEG C, wherein the initiator adopts one or more of hydrogen peroxide, ammonium persulfate, sodium persulfate and potassium persulfate, and the adding amount of the initiator is 0.05 g-0.5 g per liter of the acrylate wastewater; the acrylate wastewater subjected to the polymerization reaction is mixed with a precipitant, the mixture reacts for 10 min-2 h, solid-liquid separation is performed, and the adding amount of the precipitant is 0.05%-0.5% of the mass of the wastewater. The molecular weight of macromolecular polymers such as polyacrylic acid and the like produced through polymerization with the method ranges from millions to tens of millions of daltons, the settleability is good, and separation is easy.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for photocatalytically treating acrylate wastewater. Background technique [0002] As an important industrial raw material, acrylate has been widely used in many fields such as medicine and chemical industry. At present, acrylate is mainly produced by acrylate in industry. The wastewater generated during the production of acrylate mainly contains n-butanol, sodium acrylate, p-toluenesulfonic acid, sodium hydroxide and metal salts. [0003] The treatment technology of acrylate wastewater is mainly based on incineration treatment technology and biochemical treatment technology. Although the incineration treatment technology has reliable effects and simple steps, the fuel is expensive and equipment maintenance is difficult. In actual treatment, the cost per ton of water treatment can be as high as 300 yuan or more, and valuable resources cannot be recycled. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F1/32C02F1/52C02F1/54C02F1/56C02F103/36C02F101/34
Inventor 乔瑞平李海涛蒋玮张伦梁
Owner POTEN ENVIRONMENT GRP
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