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Method for treating phthalate wastewater by means of catalyzing persulfate by utilization of supported activated carbon in microwave inducement manner

A phthalate and persulfate technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc. OH has short half-life and other problems, to achieve the effect of no secondary pollution, easy implementation and good stability

Active Publication Date: 2016-05-11
广州中德环境技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of the traditional advanced oxidation method, such as large dosage of oxidant, high requirement on pH value, low degree of mineralization of organic matter, short OH half-life, low utilization efficiency, etc., and provide a method for degrading phthalates. The technology is efficient, easy to implement, no secondary pollution, and the removal effect is good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Soak 20-mesh activated carbon in 0.5M nitric acid solution for 24 hours, then rinse repeatedly with distilled water until neutral, and dry for later use;

[0021] 2. Mix 15% ferrous sulfate, 15% ferric chloride and 10% copper sulfate evenly in a mass ratio of 1:1:1, and mix the activated carbon and iron-containing copper solution in step (1) in a mass-volume ratio of 1 : 15 for mixing, under rapid stirring, dropwise add 5M sodium hydroxide solution to a pH value of 9.0, then age in a boiling water bath for 4 hours, cool and filter, then place it under nitrogen protection and roast at 250°C for 2 hours to obtain activated carbon supported metal catalyst;

[0022] 3. Take 100mL of dibutyl phthalate (DBP) wastewater, add 1mL of 0.4mM sodium persulfate solution, adjust the pH of the solution to 6.0 after mixing well, add 0.1g of loaded activated carbon, and put it into a reaction tube with circulating microwave The variable frequency microwave reactor, set the temperatu...

Embodiment 2

[0025] 1. Soak 50-mesh activated carbon in 0.1M nitric acid solution for 24 hours, then rinse repeatedly with distilled water until neutral, and dry for later use;

[0026] 2. Mix 30% ferrous sulfate, 30% ferric chloride and 5% copper sulfate uniformly in a mass ratio of 1:1:1, and mix the activated carbon and iron-containing copper solution in step (1) in a mass-volume ratio of 1 : 20 for mixing, under rapid stirring, dropwise add 5M sodium hydroxide solution to a pH value of 10.0, then age in a boiling water bath for 4 hours, cool and filter, then place it under nitrogen protection and roast at 400°C for 2 hours to obtain activated carbon-supported metal catalyst;

[0027] 3. Take 100mL of (2-ethylhexyl) phthalate (DEHP) wastewater, add 1mL of 0.3mM sodium persulfate solution, mix well and adjust the pH of the solution to 7.0, add 0.2g of loaded activated carbon, put it into the A variable frequency microwave reactor with a circulating microwave reaction tube, set the tempe...

Embodiment 3

[0030] 1. Soak 40-mesh activated carbon in 0.3M nitric acid solution for 24 hours, then rinse repeatedly with distilled water until neutral, and dry for later use;

[0031] 2. Mix 20% ferrous sulfate, 20% ferric chloride and 8% copper sulfate in a mass ratio of 1:1:1, and mix the activated carbon and iron-containing copper solution in step (1) in a mass-volume ratio of 1 : 18 for mixing, under rapid stirring, dropwise add 5M sodium hydroxide solution to a pH value of 9.0, then age in a boiling water bath for 4h, cool and filter, and place it under nitrogen protection for 2h roasting at 300°C to obtain activated carbon supported metal catalyst;

[0032] 3. Take 100mL of dibutyl phthalate (DBP) wastewater, add 0.5mL of 0.4mM sodium persulfate solution, mix well and adjust the pH of the solution to 9.0, add 0.1g of loaded activated carbon, and put it into the Tube frequency conversion microwave reactor, set the temperature at 75°C, and continue to react for 30 minutes;

[0033]...

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PUM

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Abstract

The invention relates to a method for treating phthalate wastewater by means of catalyzing persulfate by utilization of supported activated carbon in a microwave inducement manner, belonging to the technical field of phthalate wastewater treatment. The method comprises the following steps of adding a sodium persulfate solution with a concentration of 0.3 to 0.4 mM into phthalate wastewater with a concentration of 1500 to 3500 (mu)g / L according to a volume ratio of 0.5 to 1 percent, adjusting a pH value of the solution to be 6.0 to 9.0, then adding an activated carbon supported metal catalyst according to a proportion of 1 to 2 permillage, uniformly stirring, putting in a frequency conversion microwave reactor, setting a temperature of 70 to 80 DEG C, continuously reacting for 25 to 30 minutes, and taking a mixed solution to measure a phthalate concentration, wherein the phthalate removal rate reaches above 90 percent. The method disclosed by the invention has the advantages that microwave, supported activated carbon and persulfate act synergistically; the thermal effect and non-thermal effect of the microwave, the strong oxidation effect of the persulfate as well as the adsorptive catalysis and heat sensitization effects of the supported activated carbon are sufficiently exerted; the effects of simplicity and high efficiency in technological operation, easiness in implementation, freeness from secondary pollution, high oxidation efficiency and good removal effect are achieved.

Description

technical field [0001] The invention relates to a method for treating phthalate wastewater, in particular to a method for treating phthalate wastewater with microwave-induced loaded activated carbon catalyzed persulfate, which belongs to the phthalate wastewater treatment technology field. Background technique [0002] In recent years, the environmental behavior of endocrine disruptors has received widespread attention from the international community and has become a hot issue in the field of environmental science. Among them, phthalates are an important class of environmental hormone compounds, which have bioaccumulation and amplification effects. , show a strong affinity to animals and plants, and enter the food chain through the bioaccumulation of animals and plants, interfere with the normal level of hormones in the blood, and a small amount of phthalates in the environment can affect biological endocrine production Interfering with the reproduction, development and be...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/30C02F1/28
CPCC02F1/283C02F1/302C02F1/725C02F2101/34
Inventor 林亲铁谢红艳黎宏飞何晋勇
Owner 广州中德环境技术研究院有限公司
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