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Preparation method and application of sludge carbonization and modification magnetic nanometer material capable of activating persulfate to realize printing and dyeing wastewater treatment

A technology for activating persulfate and magnetic nanometers, applied in pyrolysis treatment of sludge, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problem of small specific surface area, difficulty in ensuring the characteristics of nanoparticles, and reduced catalytic efficiency, etc. problems, to achieve the effect of a wide range of sources, high stability and catalytic activity, and strong repeatability

Inactive Publication Date: 2017-05-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, spinel MnFe 2 o 4 The specific surface area is small, and the particles are seriously agglomerated in the solution. It is difficult to guarantee the characteristics of nanoparticles after recovery, which reduces the catalytic efficiency.

Method used

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  • Preparation method and application of sludge carbonization and modification magnetic nanometer material capable of activating persulfate to realize printing and dyeing wastewater treatment
  • Preparation method and application of sludge carbonization and modification magnetic nanometer material capable of activating persulfate to realize printing and dyeing wastewater treatment
  • Preparation method and application of sludge carbonization and modification magnetic nanometer material capable of activating persulfate to realize printing and dyeing wastewater treatment

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Experimental program
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Effect test

Embodiment 1

[0026] The preparation method of the sludge carbonization modified magnetic nano-material of the present embodiment comprises the following steps: (1) sludge pyrolysis treatment: put the remaining sludge taken from the sewage plant into a blast drying box, Dry at constant temperature for 48 hours, crush and pass through a 100-mesh sieve to obtain dry sludge. Get 10g of dry sludge and put it into 40mL of HNO with a mass fraction of 20%. 3 After stirring at room temperature for 24 hours, the activated sludge was centrifuged at a speed of 5000rpm and placed in a blast drying oven to dry at 105°C for 12 hours; the dried sludge was placed in a tubular resistance furnace , blow nitrogen at a flow rate of 100mL / min for 10min to remove the air in the tube. The pyrolysis step is to first raise the temperature to 700°C at a rate of 10°C / min, then cool down to 200°C at a rate of 10°C / min after staying for 60 minutes, and finally cool down to room temperature naturally. The cooled black...

Embodiment 2

[0030] This embodiment is a preparation method of sludge carbonization modified magnetic nanomaterials with different sludge activated carbon contents, including the following steps:

[0031] (1) sludge pyrolysis treatment is the same as step (1) in embodiment 1;

[0032] (2) Preparation of sludge carbonization modified magnetic nanomaterials: the raw material consumption of porous sludge activated carbon carbon powder described in step (1) is 0.4g, and all the other steps are the same as step (2) in Example 1;

[0033] (3) porous sludge activated carbon carbon powder raw material consumption described in step (1) is 0.8g, and other conditions are the same as (2);

[0034] The X-ray crystal diffraction patterns (XRD) of the sludge carbonization modified magnetic nanomaterials obtained with different sludge activated carbon contents are as follows: figure 2 As shown, it can be seen from the figure that the crystal structure of the sample is good, the crystallinity is high, and ...

Embodiment 3

[0036] The application of sludge carbonization modified magnetic nanomaterials to activate persulfate to treat printing and dyeing wastewater in this embodiment includes the following steps:

[0037] (1) The preparation method of sludge carbonization modified magnetic nanomaterial is the same as step (1) and step (2) in the implementation case 1;

[0038] (2) Prepare 20 mg / L Orange G solution for later use, and use a 250 mL Erlenmeyer flask as the reactor. Add 100mL, 20mg / L orange G solution to the reactor, and add 0.02g of sludge carbonation modified magnetic nanomaterials to the reactor at the same time, and add 0.05g of Na 2 S 2 o 8 Place the Erlenmeyer flask in a shaker at 160pm, react at normal temperature (25°C), take samples every 5min, filter with a 0.22μm filter head and analyze at 478nm with a spectrophotometer;

[0039] (3) Do not add sludge carbonization modified magnetic nanomaterials in the reactor, other conditions are the same as (2);

[0040] (4) No solid ...

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Abstract

The invention provides a preparation method of a sludge carbonization and modification magnetic nanometer material, comprising the following steps: drying, smashing and sieving excess sludge from a wastewater treatment plant, adding activating agent for activating treatment, performing pyrolyzation to obtain sludge activated carbon, loading nanometer MnFe2O4 onto the sludge activated carbon by means of a solvothermal method, so as to obtain the sludge carbonization and modification magnetic nanometer material. The invention also relates to application of the sludge carbonization and modification magnetic nanometer material prepared from the method disclosed by the invention capable of activating persulfate to realize printing and dyeing wastewater treatment. According to the invention, as the excess sludge is taken as primary raw material, resource utilization of the sludge is realized, the preparation method is simple and easy to operate, the cost is low, the sludge-based magnetic material has a stable structure and a small metal leaching rate, high magnetic stability enables the easiness for recycling and circulation, the activation effect remains very good after repeated utilization for many times, and the sludge carbonization and modification magnetic nanometer material is an environment-friendly material, and has a wide application prospect in degradation of organic pollutant.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method and application of activated persulfate to treat sludge carbonization modified magnetic nanometer material of printing and dyeing wastewater. Background technique [0002] Municipal sludge has a high content of organic matter, which is the basic condition for the manufacture of activated carbon. The preparation of activated carbon from the residual sludge of urban sewage treatment plants has become one of the most popular technologies at present. This technology can not only solve the problem of the outlet of excess sludge , and an activated carbon material with both adsorption and catalytic effects and low price can be obtained. However, the activated carbon prepared from municipal sludge is usually in the form of powder. In actual use, not only the sanitary conditions are not good, but also problems such as difficulties in separation and recovery ar...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J21/18B01J32/00B01J20/20C02F11/10C02F1/28C02F1/72
CPCB01J20/20C02F1/28C02F1/725C02F11/10B01J21/18B01J23/8892C02F2101/308C02F1/283C02F1/281B01J35/33B01J35/40Y02W10/40
Inventor 杨志泉李颖
Owner SOUTH CHINA UNIV OF TECH
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