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Magnetic sludge biochar, preparation method therefor and application of magnetic sludge biochar

A biochar and sludge technology, applied in water/sludge/sewage treatment, water pollutants, pyrolysis treatment of sludge, etc., can solve problems such as poor adsorption and removal capacity, limited adsorption sites, and secondary pollution of water bodies. , to achieve the effect of easy operation, reduction of preparation cost, and realization of recycling

Inactive Publication Date: 2018-11-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the small specific surface area of ​​unmodified sludge biochar, the adsorption sites that can be provided are limited, so the ability to adsorb and remove pollutants such as organic matter and heavy metals in wastewater is poor.
Moreover, because the remaining sludge contains more heavy metals, the direct application of untreated sludge biochar may cause secondary pollution to the water body, and, because the particle size of biochar is small, it is difficult to recover from the water body, which may cause Cause secondary pollution, which limits its application to a certain extent

Method used

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  • Magnetic sludge biochar, preparation method therefor and application of magnetic sludge biochar
  • Magnetic sludge biochar, preparation method therefor and application of magnetic sludge biochar
  • Magnetic sludge biochar, preparation method therefor and application of magnetic sludge biochar

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Embodiment 1

[0033] The present embodiment provides a kind of magnetic sludge biochar and preparation method thereof, and the method is carried out according to the following steps:

[0034] After the sludge is dehydrated by the zero-valent iron-persulfate system (add 0.375g of potassium persulfate and 3g of zero-valent iron (iron powder) to each gram of sludge and mix it in an air bath at 25°C for 0.5 hours), send it into High-temperature tube furnace, pyrolysis at 1000°C under nitrogen atmosphere, the temperature of the high-temperature pyrolysis furnace is raised from 25°C to 1000°C at a heating rate of 15°C / min, and kept at 1000°C for 90 minutes, and the pyrolyzed magnetic contamination The mud biochar is passed through a 200-mesh sieve. The SEM, XRD and XPS images observed under the scanning electron microscope for the obtained magnetic sludge biochar are as follows: Figure 1-3 shown. Depend on Figure 1-3 It can be seen that the magnetic sludge biochar obtained at 1000℃ mainly co...

Embodiment 2

[0036]The present embodiment provides a kind of magnetic sludge biochar and preparation method thereof, and the method is carried out according to the following steps:

[0037] After the sludge is dehydrated by the zero-valent iron-persulfate system (add 0.375g of potassium persulfate and 3g of zero-valent iron (iron powder) to each gram of sludge and mix it in an air bath at 25°C for 0.5 hours), send it into High-temperature tube furnace, pyrolysis at 800°C under nitrogen atmosphere, the temperature of the high-temperature pyrolysis furnace was raised from 25°C to 800°C at a heating rate of 15°C / min, and kept at 800°C for 90 minutes, and the pyrolyzed magnetic contamination The mud biochar is passed through a 200-mesh sieve. The SEM, XRD and XPS images observed under the scanning electron microscope for the obtained magnetic sludge biochar are as follows: Figure 1-3 shown. Depend on Figure 1-3 It can be seen that the magnetic sludge biochar obtained at 800°C mainly conta...

Embodiment 3

[0039] The present embodiment provides a kind of magnetic sludge biochar and preparation method thereof, and the method is carried out according to the following steps:

[0040] After the sludge is dehydrated by the zero-valent iron-persulfate system (add 0.375g of potassium persulfate and 3g of zero-valent iron (iron powder) to each gram of sludge and mix it in an air bath at 25°C for 0.5 hours), send it into High-temperature tube furnace, pyrolyze at 600°C under nitrogen atmosphere, heat up from 25°C to 600°C at a heating rate of 15°C / min, and keep at 600°C for 90 minutes, the pyrolyzed magnetic contamination The mud biochar is passed through a 200-mesh sieve. The SEM, XRD and XPS images observed under the scanning electron microscope for the obtained magnetic sludge biochar are as follows: Figure 1-3 shown. Depend on Figure 1-3 It can be seen that the magnetic sludge biochar obtained at 600°C mainly contains Fe3O4.

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Abstract

The invention discloses magnetic sludge biochar, a preparation method therefor and an application of the magnetic sludge biochar and belongs to the technical field of preparation of biochar. The preparation method comprises the steps of dewatering sludge of a sewage treatment plant, then, carrying out pyrolysis by adopting a high-temperature tubular furnace, and then, carrying out sieving, therebyobtaining the magnetic sludge biochar. According to the application, the biochar is used for catalytically degrading refractory organic pollutants. According to the method, the sludge serves as a preparation raw material of the biochar, thus, the preparation cost is reduced, the problem in how to efficiently utilize the sludge is effectively solved, and thus, the method has good environmental andeconomic benefits. The biochar material prepared by the method is environmentally friendly, efficient and cheap and can be applied to the fields of activated degradation of organic pollutants and thelike by persulfate.

Description

technical field [0001] The invention relates to magnetic sludge biochar, a preparation method and application thereof, and belongs to the technical field of biochar preparation. Background technique [0002] With economic development and social progress, a wide variety of pharmaceuticals and personal care products (PPCPs), endocrine disruptors (EDCs), disinfection by-products (DBPs), environmental hormones, pesticides, etc. are discharged into the water environment. Bioaccumulation affects the health of aquatic organisms at low concentrations, which in turn affects human health. Most of these substances are not controlled by specific environmental management policies and regulations or emission standards, and are usually called new pollutants. At present, the main treatment processes include concrete precipitation method, activated carbon adsorption method, membrane technology and advanced oxidation method. [0003] With the development of our country's economy, more and m...

Claims

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Application Information

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IPC IPC(8): B01J23/745C02F1/72C02F11/10C02F11/12C02F101/38
CPCB01J23/745C02F1/725C02F11/10C02F11/12C02F2101/38C02F2101/40
Inventor 贺诗欣陈以頔李瑞祥张嘉修任南琪
Owner HARBIN INST OF TECH
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