CN119819279A - Waste biochar regeneration method based on microwave heating and non-heating effects - Google Patents
Waste biochar regeneration method based on microwave heating and non-heating effects Download PDFInfo
- Publication number
- CN119819279A CN119819279A CN202510207092.9A CN202510207092A CN119819279A CN 119819279 A CN119819279 A CN 119819279A CN 202510207092 A CN202510207092 A CN 202510207092A CN 119819279 A CN119819279 A CN 119819279A
- Authority
- CN
- China
- Prior art keywords
- biochar
- microwave
- thermal
- waste
- quartz reactor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
一种基于微波热与非热效应的废生物炭再生方法，涉及一种废生物炭再生方法。为解决废生物炭孔隙阻塞、污染物固定效果不足的问题，本发明步骤包括1、将样品分别放置在微波装置内的石英反应器中；2、将温度梯度升至1000℃；3、样品同步微波辐射；4、收集冷却至室温的生物炭。微波加热引起的微等离子体和热点具有催化效应，有效加速了废生物炭表面碳化，从而提升了污染物固定效果。进一步，微波非热效应通过高频电磁波引起生物炭偶极分子旋转，在生物炭内部产生新孔隙，新生生物炭孔容和孔尺寸分布明显增加。最后，500℃、700℃均获得了预期结果，通过施加高频电磁波，废弃生物炭孔结构得到明显改善。本发明属于废物再生利用技术领域。
A method for regenerating waste biochar based on microwave thermal and non-thermal effects, relates to a method for regenerating waste biochar. In order to solve the problems of pore blockage and insufficient pollutant fixation effect of waste biochar, the steps of the present invention include 1. placing samples in quartz reactors in microwave devices respectively; 2. raising the temperature gradient to 1000°C; 3. synchronous microwave irradiation of samples; 4. collecting biochar cooled to room temperature. The microplasma and hot spots caused by microwave heating have a catalytic effect, which effectively accelerates the carbonization of the surface of waste biochar, thereby improving the pollutant fixation effect. Furthermore, the microwave non-thermal effect causes the rotation of biochar dipole molecules through high-frequency electromagnetic waves, generates new pores inside the biochar, and significantly increases the pore volume and pore size distribution of the new biochar. Finally, the expected results were obtained at 500°C and 700°C, and the pore structure of the waste biochar was significantly improved by applying high-frequency electromagnetic waves. The present invention belongs to the technical field of waste recycling.
Description
Technical Field
The invention relates to a waste biochar regeneration method, and belongs to the technical field of waste recycling.
Background
Biochar is widely applied in the fields of wastewater treatment, soil remediation, plant root growth and the like due to the excellent pore structure and rich functional groups. At present, the raw materials for preparing the biochar are extremely wide in source, wherein sludge (sewage sludge, papermaking sludge, printing and dyeing sludge and the like) and biomass (lignin, rice hulls, rice and the like) are mainly used. Pyrolysis is used as a low-carbon and high-efficiency biochar material synthesis technology and becomes a technical means commonly adopted in academia and industry.
Currently, application research on biochar is mainly focused on aspects of pollutant adsorption efficiency, toxicity release risk and the like. Although the biochar has good application results in practical engineering, neglecting the subsequent regeneration and utilization thereof leads to a significant technical bottleneck in the large-scale production of the biochar market. The key points of the difficulty in the recycling of the biochar are in two aspects of pore structure blockage and toxicity release of adsorbed pollutants. Therefore, the development of the biochar recycling technology is important to the improvement of the core technical status of China internationally owned.
Microwaves cause the dipole molecules to rotate frequently by emitting electromagnetic waves at frequencies between 300 megahertz and 3000 gigahertz. Then, friction of adjacent dipole molecules generates a large amount of heat, and finally quick temperature rise of the biochar is realized. Microplasmas and hot spots caused by microwave heating proved to have excellent catalytic effects. Based on this, it is speculated herein that the internal components of the biochar pore structure will be further catalytically cracked. Meanwhile, the non-thermal effect caused by microwaves accelerates the decomposition of components in the pores into small molecular components by the rotation and vibration of dipole molecules, and finally solves the problem of the blockage of the pore structure of the waste biochar. In addition, the biochar pore structure is further carbonized, so that the pollutant fixing effect is effectively improved. The invention has important practical significance for realizing the recycling of the waste biochar.
Disclosure of Invention
The invention provides a waste biochar regeneration method based on microwave heat and non-heat effect, which aims to solve the problem of the blocking of waste biochar pores and the insufficient pollutant fixing effect. The biochar pore structure initially forms new carbon at 300 ℃ and develops into a complete carbon pore structure at 500 ℃. Based on the method, a gradient heating experimental group is arranged, and the structural change of waste biochar holes subjected to microwave treatment at 300-700 ℃ is observed, so that the optimal experimental conditions are determined.
The invention adopts the technical proposal for solving the problems that the method comprises the following steps:
step 1, respectively placing samples in quartz reactors in a microwave device;
Step 2, raising the temperature in the quartz reactor to 500 ℃ and 700 ℃ respectively;
Step 3, carrying out microwave radiation on the sample;
And 4, collecting the biochar cooled to room temperature.
Further, the temperature rising speed in the quartz reactor in the step 2 is 100 ℃ per min.
Further, in step 3, electromagnetic waves having a frequency between 300 megahertz and 3000 gigahertz are emitted to the sample.
Further, in order to maintain a strict inert atmosphere in the quartz reactor, pure argon is continuously injected into the quartz reactor to discharge oxygen, the microwave device is closed after a specified reaction time is reached, and high-purity argon is injected into the quartz reactor again to remove residual gas.
Furthermore, the microwave non-thermal effect causes the dipole molecules of the biochar to rotate through high-frequency electromagnetic waves, so that new pores are generated in the biochar, the pore volume and pore size distribution of the new biochar are obviously increased, and finally the regeneration and the utilization of the waste biochar are realized.
Further, in order to maintain a strict inert atmosphere in the quartz reactor, pure argon was continuously injected into the quartz reactor at a flow rate of 10L/min for 20 minutes.
Further, after the specified reaction time is reached, the microwave device is turned off, and high-purity argon is again injected into the quartz reactor for 20 minutes.
Further, the ideal effects are obtained at 500 ℃ and 700 ℃, and under the condition, the application of high-frequency electromagnetic waves is beneficial to remarkably improving the hole structure of the waste biochar.
The beneficial effects of the invention are as follows:
(1) The micro-plasmas and hot spots caused by microwave heating have catalytic effects, so that the carbonization of the surface of the waste biochar is effectively accelerated, and the pollutant fixing effect is improved. Further, the microwave non-thermal effect causes the dipole molecules of the biochar to rotate through high-frequency electromagnetic waves, so that new pores are generated in the biochar, and finally, the regeneration and the utilization of the waste biochar are realized.
(2) Carrying out microwave treatment on the charcoal which is pyrolyzed at 500 ℃ and 700 ℃, analyzing the pore characteristics of the charcoal by adopting a physical and chemical adsorption instrument, and finding that the pore volume of the new charcoal is obviously increased and the pore size distribution is further enlarged after the microwave treatment; the invention determines 500 ℃ as the optimal condition, and the 700 ℃ carbon pore structure is obviously improved, solves the engineering bottleneck problem of insufficient pollutant fixing effect due to the blocking of the waste biochar pores, and realizes the development of the waste biochar recycling technology.
Drawings
FIG. 1 is a schematic diagram of the structural features of a 500 ℃ biochar pore;
FIG. 2 is a schematic diagram of the pore structure characteristics of a biochar at 700 ℃.
Detailed Description
The first embodiment is as shown in fig. 1, the method for regenerating the waste biochar based on the microwave heat and non-heat effect comprises the following specific steps:
step 1, respectively placing samples in quartz reactors in a microwave device;
step 2, respectively increasing the temperature in the quartz reactor to 500 ℃ and 700 ℃, wherein the temperature increasing speed in the quartz reactor is 100 ℃ per minute;
Step 3, carrying out microwave radiation on the sample, and transmitting electromagnetic waves with the frequency of 300 megahertz to 3000 gigahertz to the sample;
And 4, collecting the biochar cooled to room temperature.
In the second embodiment, as shown in fig. 1, in order to maintain a strict inert atmosphere in the quartz reactor, pure argon is continuously injected into the quartz reactor to discharge oxygen, the microwave device is closed after a specified reaction time is reached, and high-purity argon is re-injected into the quartz reactor to remove residual gas.
Wherein, in order to maintain a strict inert atmosphere in the quartz reactor, pure argon gas was continuously injected into the quartz reactor at a flow rate of 10L/min for 20 minutes.
After the specified reaction time is reached, the microwave device is turned off, and high-purity argon is injected into the quartz reactor again for 20 minutes.
In the embodiment, the waste biochar is widely sourced and comprises biochar prepared by taking sludge, lignin, rice hulls, rice and the like as materials, and specifically waste biochar generated by engineering such as industrial wastewater treatment, soil remediation and the like is used;
the microwave device comprises a microwave cavity, a quartz reactor, a wave guide pipe, a magnetron, a PC fuzzy logic algorithm, a power regulator, an infrared thermometer and a gas flowmeter;
waste biochar microwave test process:
step one, collecting waste biochar generated in different engineering application scenes as an experiment set by taking newly prepared biochar as a control set, and carrying out batch experiments by setting different microwave frequencies as variables;
Step two, respectively placing the samples in quartz reactors in a microwave chamber;
and step three, the temperature is increased to 300-700 ℃ at a speed of 100 ℃ per minute. After the set temperature is reached, carrying out microwave radiation on the sample, and emitting electromagnetic waves with the frequency of 300 megahertz to 3000 gigahertz, wherein the electromagnetic waves cause the dipole molecules of the waste biochar to rotate, so that new pores are generated in the biochar;
And step four, collecting the biochar cooled to room temperature for performance evaluation.
The microwave non-thermal effect causes the dipole molecules of the biochar to rotate through high-frequency electromagnetic waves, new pores are generated in the biochar, the pore volume and the pore size distribution of the new biochar are obviously increased, and finally the regeneration and the utilization of the waste biochar are realized.
Wherein, 500 ℃ and 700 ℃ are ideal pyrolysis conditions, and the high-frequency electromagnetic wave is applied under the conditions, thereby being beneficial to remarkably improving the hole structure of the waste biochar.
The present invention is not limited to the preferred embodiments, and the present invention is described above in any way, but is not limited to the preferred embodiments, and any person skilled in the art will appreciate that the present invention is not limited to the embodiments described above, while the invention has been described with respect to specific examples including presently preferred modes of carrying out the invention, those skilled in the art will appreciate that there are numerous variations and permutations of the above described embodiments that fall within the spirit and scope of the invention as set forth in the appended claims.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510207092.9A CN119819279A (en) | 2025-02-25 | 2025-02-25 | Waste biochar regeneration method based on microwave heating and non-heating effects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510207092.9A CN119819279A (en) | 2025-02-25 | 2025-02-25 | Waste biochar regeneration method based on microwave heating and non-heating effects |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119819279A true CN119819279A (en) | 2025-04-15 |
Family
ID=95297750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510207092.9A Pending CN119819279A (en) | 2025-02-25 | 2025-02-25 | Waste biochar regeneration method based on microwave heating and non-heating effects |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119819279A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000063960A (en) * | 2000-08-12 | 2000-11-06 | 이길환 | Regeneration method of spent activated carbon using microwave |
| JP2008188490A (en) * | 2007-02-01 | 2008-08-21 | Orion Mach Co Ltd | Adsorbent regeneration apparatus using microwave |
| CN114225926A (en) * | 2021-11-26 | 2022-03-25 | 中国辐射防护研究院 | Microwave regeneration treatment system and method for granular waste activated carbon |
-
2025
- 2025-02-25 CN CN202510207092.9A patent/CN119819279A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000063960A (en) * | 2000-08-12 | 2000-11-06 | 이길환 | Regeneration method of spent activated carbon using microwave |
| JP2008188490A (en) * | 2007-02-01 | 2008-08-21 | Orion Mach Co Ltd | Adsorbent regeneration apparatus using microwave |
| CN114225926A (en) * | 2021-11-26 | 2022-03-25 | 中国辐射防护研究院 | Microwave regeneration treatment system and method for granular waste activated carbon |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104787747B (en) | Method for preparing multiwalled carbon nanotube through microwave enhanced fast pyrolysis of biomass and/or carbonaceous organic waste | |
| TWI236505B (en) | Thermal cracking chemical vapor deposition process for nanocarbonaceous material | |
| Qiu et al. | Microwave-assisted pyrolysis of biomass: Influence of feedstock and pyrolysis parameters on porous biochar properties | |
| WO2020088172A1 (en) | Continuous operation method for microwave high-temperature pyrolysis of solid material comprising organic matter | |
| CN109772472B (en) | A method for preparing carbon catalytic material from excess sludge with high water content | |
| CN103738964B (en) | A kind of SiC/SiO 2the preparation method of coaxial nanowire | |
| CN103395783B (en) | The preparation method of activated carbon and equipment thereof | |
| CN105131985A (en) | Microwave-assisted vacuum horizontal biochar carbonization equipment | |
| CN104961493B (en) | A kind of preparation method of biomass-based porous silicon carbide absorbing material | |
| CN114921258B (en) | Recyclable tire microwave in-situ catalytic pyrolysis method for preparing hydrogen-rich gas | |
| CN109179408A (en) | The method that microwave vacuum pyrolysis prepares activated carbon from activated sludge | |
| EP2460915A1 (en) | Method for stabilizing a carbon-containing fibre and method for producing a carbon fibre | |
| KR20180071184A (en) | Manufacturing apparatus for cabon fiber using microwave | |
| CN116217326B (en) | Plastic coupling hydrogen production method by plasma-photocatalytic conversion | |
| CN108439377A (en) | It is a kind of to cooperate with processing organic liquid waste using non-thermal plasma trap and prepare the device and method of graphene | |
| WO2022089670A1 (en) | Method for preparing nano-carbon material | |
| CN119819279A (en) | Waste biochar regeneration method based on microwave heating and non-heating effects | |
| CN105948777B (en) | A kind of preparation method of carbon/carbon composite material with density of 0.5～0.8g/cm3 | |
| KR20040102004A (en) | Microwave assisted treatment of carbon foam | |
| CN215196314U (en) | Ozone-enhanced microwave catalytic oxidation waste gas treatment device | |
| CN112028054B (en) | A method for preparing ultra-long multi-walled carbon nanotubes from biomass by two-step microwave treatment | |
| CN114082427A (en) | Preparation method of three-dimensional porous mesh carbon-based nanoflower catalyst for microwave catalytic depolymerization of kraft lignin | |
| Qu et al. | Microwave-assisted synthesis and functionalization of biochar for environmental remediation: regulate strategy and application potential | |
| CN103721691B (en) | A kind of mobile rake tooth type microwave oven for Powdered Activated Carbon regeneration | |
| CN113061455B (en) | A kind of method for swell modification and strengthening waste tire pyrolysis to make oil and carbon black |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |