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Ultraviolet digestion method for EDTMPA (ethylenediamine tetramethylenephosphonic acid)

A technology of ethylenediamine tetramethylene phosphonic acid and digestion method, which is applied in chemical instruments and methods, special treatment targets, water/sludge/sewage treatment, etc., and can solve the problems of long digestion time, difficult application, cumbersome steps, etc. problem, to achieve the effect of simple method, easy operation and high processing efficiency

Inactive Publication Date: 2018-06-22
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sun Xiaojuan et al. (UV photocatalytic digestion - spectrophotometric determination of total phosphorus in circulating water, petrochemical industry) in the presence of potassium persulfate, in alkaline medium, with ultraviolet light (20W ultraviolet germicidal lamp) catalytic digestion - spectrophotometric determination of circulation Total phosphorus in water, this method needs to adjust the alkaline environment, which is not easy to achieve in the actual circulating water treatment process, and the digestion time takes 15 minutes, which is long and cannot achieve the purpose of rapid digestion, and the energy consumption is high
Chen Xiaoping (Ultraviolet oxidative digestion-spectrophotometry in the determination of total phosphorus in circulating water in ethylene plants, Guangdong Chemical Industry) studied the use of potassium persulfate as an oxidant in an alkaline environment to detect total phosphorus in circulating water in ethylene plants using ultraviolet light digestion. Phosphorus method, this method needs to select and adjust the lamp distance, and needs to adjust the alkaline environment, the steps are cumbersome, it is difficult to apply in actual water treatment, the digestion time is too long, and the purpose of rapid digestion cannot be achieved

Method used

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  • Ultraviolet digestion method for EDTMPA (ethylenediamine tetramethylenephosphonic acid)
  • Ultraviolet digestion method for EDTMPA (ethylenediamine tetramethylenephosphonic acid)

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Experimental program
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Effect test

Embodiment 1

[0026] The method for degrading organophosphorus EDTMPA by ultraviolet light oxidation method comprises the following steps in specific implementation:

[0027] Prepare 10mg / L EDTMPA aqueous solution in a 250mL volumetric flask, add 4mL sodium persulfate with a concentration of 0.8g / L, so that the mass ratio of ethylenediamine tetramethylene phosphonic acid and sodium persulfate is 1:80, pour Digest in the ultraviolet digestion device for 2 minutes, and the phosphorus concentration measured by ultraviolet spectrophotometry is 0.42mg / L. The total phosphorus content in the 10mg / L DTMPPA aqueous solution measured by the national standard method GB11893-89 is 0.43mg / L. The digestion rate is 97%.

Embodiment 2

[0029] The method for degrading organophosphorus EDTMPA by ultraviolet light oxidation method comprises the following steps in specific implementation:

[0030] Prepare 10mg / L EDTMPA aqueous solution in a 250mL volumetric flask, add 4mL sodium persulfate with a concentration of 1g / L, so that the mass ratio of ethylenediamine tetramethylene phosphonic acid and sodium persulfate is 1:100, and pour into the UV Digest in the digestion device for 3 minutes, and the phosphorus concentration measured by ultraviolet spectrophotometry is 0.416mg / L. The total phosphorus content in the 10mg / L DTMPPA aqueous solution measured by the national standard method GB11893-89 is 0.43mg / L. The digestion rate was 96.7%.

Embodiment 3

[0032] The method for degrading organophosphorus EDTMPA by ultraviolet light oxidation method comprises the following steps in specific implementation:

[0033] Prepare 10mg / L EDTMPA aqueous solution in a 250mL volumetric flask, add 4mL sodium persulfate with a concentration of 1.2g / L, so that the mass ratio of ethylenediamine tetramethylene phosphonic acid and sodium persulfate is 1:120, pour Digest in the ultraviolet digestion device for 3.5 minutes, and the phosphorus concentration measured by ultraviolet spectrophotometry is 0.415mg / L. The total phosphorus content in the 10mg / L DTMPPA aqueous solution measured by the national standard method GB11893-89 is 0.43mg / L. The digestion rate is 96.5%.

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Abstract

The invention relates to an ultraviolet oxidation based digestion method for EDTMPA (ethylenediamine tetramethylenephosphonic acid) in wastewater. According to the method, sodium persulfate is added to the wastewater containing EDTMPA, the wastewater is irradiated by a 10W low-voltage mercury lamp, and digestion rate of organophosphorus EDTMPA reaches 96% or higher. The method is simple to operate, low in energy consumption, energy-saving and environmentally friendly, digestion is fast, and pH regulation is not required.

Description

technical field [0001] The invention belongs to the field of wastewater treatment methods, and in particular relates to a method for ultraviolet digestion of ethylenediaminetetramethylenephosphonic acid. Background technique [0002] During the continuous circulation of industrial circulating cooling water, the mineral content in the water continues to increase, causing scaling of equipment pipes. Scale not only affects the cooling effect of the system, but also causes corrosion to the cooling pipeline system, resulting in perforation and leakage of the cooling pipeline. Therefore, anti-scaling in circulating water is very important. Organic phosphates have good corrosion and scale inhibition properties and are widely used in circulating cooling water. [0003] Ethylenediaminetetramethylenephosphonic acid (EDTMPA), white crystalline powder at room temperature, slightly soluble in water, solubility at room temperature is less than 5%, easily soluble in ammonia water. EDTMPA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72C02F101/38
CPCC02F1/32C02F1/72C02F2101/38C02F2303/22
Inventor 高灿柱张晓芸程终发李鹏飞宋盟盟王东海
Owner SHANDONG UNIV
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