An Advanced Catalytic Oxidation Method for Treating Phthalate Wastewater

An advanced catalytic oxidation and phthalate ester technology, applied in chemical instruments and methods, water/sewage treatment, special compound water treatment, etc., can solve the requirements of incomplete oxidation of pollutants, short OH half-life, and pH value Advanced problems, to achieve the effect of shortened processing time, no secondary pollution, and simple operation

Active Publication Date: 2018-07-31
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the H that Fenton method exists 2 o 2 Low utilization rate, high requirement for pH value (pH value around 3.0), many foams, short OH half-life, inability to fully oxidize pollutants, etc. Provide a fast and efficient process for degrading phthalates in wastewater method, its process technology is efficient, easy to implement, no secondary pollution, good removal effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh 0.8g sodium percarbonate, add 500ml distilled water, dissolve and mix well;

[0020] (2) Take 2 mL of sodium percarbonate solution and add it to 200 mL of (2-ethylhexyl) phthalate (DEHP) wastewater with a concentration of 400 µg / L, adjust the pH of the solution to 9.0, and add 0.4 g of 20-mesh iron-carbon filler , stir evenly to obtain a mixture;

[0021] (3) Put the mixture into a frequency conversion microwave reactor, set the temperature at 80°C, and keep stirring for 40 minutes;

[0022] (4) Put the wastewater after the microwave catalytic oxidation reaction in an ice-water bath below 5°C for 8 minutes, take the supernatant to measure the DEHP concentration, and the removal rate of DEHP is 80.2%.

Embodiment 2

[0024] (1) Weigh 0.9g sodium percarbonate, add 500ml distilled water, dissolve and mix well;

[0025] (2) Take 1 mL of sodium percarbonate solution and add it to 200 mL of (2-ethylhexyl) phthalate (DEHP) wastewater with a concentration of 300 µg / L, adjust the pH of the solution to 10.0, and add 0.2 g of 20-mesh iron-carbon filler , stir evenly to obtain a mixture;

[0026] (3) Put the mixture into a frequency conversion microwave reactor, set the temperature at 85°C, and keep stirring for 30 minutes;

[0027] (4) Put the wastewater after the microwave catalytic oxidation reaction in an ice-water bath below 5°C for 8 minutes, take the supernatant to measure the DEHP concentration, and the removal rate of DEHP is 78.2%.

Embodiment 3

[0029] (1) Weigh 1.3g sodium percarbonate, add 500ml distilled water, dissolve and mix well;

[0030] (2) Add 1.5mL of sodium percarbonate solution to 200mL of dimethyl phthalate (DMP) wastewater with a concentration of 800µg / L, adjust the pH of the solution to 11.0, add 0.3g of 50-mesh iron-carbon filler, and stir evenly. get the mixture;

[0031] (3) Put the mixture into a frequency conversion microwave reactor, set the temperature at 85°C, and keep stirring for 35 minutes;

[0032] (4) Put the wastewater after the microwave catalytic oxidation reaction in an ice-water bath below 5°C for 8 minutes, take the supernatant to measure the DMP concentration, and the removal rate of DMP reaches 85.4%.

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PUM

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Abstract

The invention relates to an advanced catalytic oxidation method for treating phthalate wastewater, and belongs to the technical field of phthalate wastewater treatment. The method comprises the steps that a sodium percarbonate solution with the molar concentration of 5-10 mM is added into the phthalate pollution wastewater with the concentration of 300-1000 mug / L according to the volume ratio of 0.5%-1%, the pH of the solution is adjusted to 9.0-11.0, 20-50-mesh iron-carbon packing is added according to the mass ratio of 0.5%o-1%o, and the materials are stirred evenly; a mixed solution is placed in a variable-frequency microwave reactor, the temperature is set at 80 DEG C-95 DEG C, and reacting under continuous stirring is performed for 25-40 minutes; the mixed solution is taken out, the concentration of phthalate in the wastewater is measured, and the phthalate removal rate reaches 75% or above. According to the method, the synergistic effect of the thermal effect and non-thermal effect of microwaves, the iron-carbon adsorption and primary battery effect and the Fenton-like high oxidation effect formed by iron in iron carbon and an active component of sodium percarbonate is achieved, the degradation rate of organic matter is greatly sped up, and the process technology is efficient, easy to implement, free of secondary pollution and good in removal effect.

Description

technical field [0001] The invention relates to a method for treating phthalate wastewater, in particular to an advanced catalytic oxidation method for treating phthalate wastewater, and belongs to the technical field of phthalate wastewater treatment. Background technique [0002] Phthalates (PAEs) are the main plastic plasticizers, widely used in industries such as plastics, automobiles, clothing, cosmetics, lubricants and pesticides, with an annual global output of nearly 6 million tons. Since PAEs are not polymerized into the polymer carbon chain, but combined with it by hydrogen bond or van der Waals force, they retain their independent chemical properties, so they are easily released into the environment. Phthalates have reached the level of universal detection around the world, seriously threatening human health and the ecological environment, and have attracted widespread attention. Diethylhexyl formate (DEHP), butyl benzyl phthalate (BBP), dibutyl phthalate (DBP), d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F101/34
CPCC02F1/725C02F2101/34C02F2305/026
Inventor 林亲铁张璐何晋勇
Owner GUANGDONG UNIV OF TECH
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