CN114230005A - Preparation method and application of magnetic biochar - Google Patents
Preparation method and application of magnetic biochar Download PDFInfo
- Publication number
- CN114230005A CN114230005A CN202111642774.0A CN202111642774A CN114230005A CN 114230005 A CN114230005 A CN 114230005A CN 202111642774 A CN202111642774 A CN 202111642774A CN 114230005 A CN114230005 A CN 114230005A
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- reaction
- magnetic biochar
- anaerobic
- preparation
- drying
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 239000010902 straw Substances 0.000 claims abstract description 17
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000012265 solid product Substances 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 9
- 239000012295 chemical reaction liquid Substances 0.000 claims abstract description 7
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 239000002699 waste material Substances 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 239000000047 product Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000012216 screening Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 9
- 239000010802 sludge Substances 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000010842 industrial wastewater Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000654 additive Substances 0.000 abstract 1
- 230000002779 inactivation Effects 0.000 abstract 1
- 230000029087 digestion Effects 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000696 methanogenic effect Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a preparation method of magnetic biochar, which comprises the following steps: crushing biological straws, screening, cleaning and drying; cleaning waste scrap iron, and adding acid for dissolving to obtain reaction liquid; adding the dried biological straws into the reaction solution, fully stirring, carrying out hydrothermal reaction, and sieving a product after the reaction to obtain a solid product; and washing the solid product by using an organic solution for a plurality of times, and drying to obtain the magnetic biochar. According to the invention, the magnetic biochar is prepared from the straws and the waste scrap iron, so that the problems of high manufacturing cost, easy inactivation and easy loss of exogenous additives are solved, and the anaerobic effect can be better improved.
Description
Technical Field
The invention relates to the technical field of magnetic biochar, in particular to a preparation method and application of magnetic biochar.
Background
The anaerobic digestion technology is a biochemical degradation technology which can ensure that energy and energy are extracted from high-concentration organic matters at present, and in the process of degrading pollutants and solid wastes, the pollutants are converted into harmless gas from liquid, and are further recycled. Subsequently, the inorganic salts which are remained in the residual digestion products and have the utilization value can be recycled and reused for a plurality of times. More importantly, the anaerobic digestion process brings considerable economic, social and environmental benefits for a plurality of civil fields by the advantages of wide application range, low operation energy consumption, high operation load, less excess sludge, low required nutrient substances and the like.
However, in the anaerobic process, the different sensitivities of methanogenic flora and acidifying bacteria to the external environment will cause uncertainty on the degradation of wastewater, so that the anaerobic digestion has the problems of long reaction period and low methanogenesis rate. By means of exogenous reinforcement, improvement of the reducing atmosphere of an anaerobic system, reinforcement of the activity of methanogens and change of an anaerobic electron transfer path are considered as effective means for improving anaerobic efficiency. The patent "a device of chemical industry waste water is handled to zero-valent iron strengthening ABR anaerobic reactor" (CN 110803764A) uses zero-valent iron to strengthen the anaerobism effect and handle chemical industry waste water, but at the in-process of anaerobic reaction long-term operation, the iron compounds are formed easily on zero-valent iron surface, reduce area of contact for anaerobic rate descends, influences the anaerobic digestion effect. The patent "a method for degrading phenol pollutants by using ferroferric oxide nanoparticles reinforced anaerobic reactor" (CN 108793402A) uses the ferroferric oxide nanoparticles to reinforce the anaerobic effect, so that the removal efficiency of phenol pollutants is improved, however, the ferroferric oxide nanoparticles have high manufacturing cost and are easy to run off along with the extension of the operation time, so that the anaerobic effect is reduced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a preparation method of magnetic biochar and application thereof in intensified anaerobism.
The invention provides a preparation method of magnetic biochar, which comprises the following steps:
s1, crushing the biological straws, screening, cleaning and drying;
s2, washing the waste scrap iron, and adding acid to dissolve to obtain a reaction solution;
s3, adding the dried biological straws obtained in the step 1 into the reaction liquid, fully stirring, carrying out hydrothermal reaction, and sieving the product after the reaction to obtain a solid product;
and S4, washing the solid product by using an organic solution for a plurality of times, and drying to obtain the magnetic biochar.
Preferably, in S2, the mass-to-volume ratio of the scrap iron pieces to the acid is 1: 2-1: 3.
preferably, in S3, the mass volume of the biological straw and the reaction solution is 1: 4-4: 1.
preferably, in S3, the reaction temperature of the hydrothermal reaction is 150-250 ℃.
Preferably, in S3, the reaction time of the hydrothermal reaction is 4-10 h.
The invention also discloses an application of the magnetic biochar obtained by the preparation method in the enhanced anaerobic treatment of chemical wastewater, and the treatment method comprises the following steps: adding industrial wastewater with COD concentration of 2000-3000mg/L into an anaerobic reactor inoculated with anaerobic activated sludge, adding the magnetic biochar into the anaerobic reactor, wherein the pH value of inlet water is 7.5-8.5, the reaction residence time is 90-120h, and the reaction temperature is 25-35 ℃.
Preferably, the adding mass of the magnetic biochar is 0.02-0.1% of the volume of inlet water.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the magnetic biochar is prepared by utilizing waste scrap iron and crop straws through a hydrothermal synthesis method, and the biochar is added into the anaerobic reactor, so that the anaerobic treatment effect of chemical wastewater is improved, and the anaerobic process is accelerated. Through the mode of waste recycling, the problems of long anaerobic digestion period and unstable effect of the chemical wastewater are solved. The invention has wide application prospect in chemical wastewater treatment.
2. The magnetic biochar disclosed by the invention uses waste scrap iron and straws as raw materials, and the prepared material is wide in source and low in cost.
3. The magnetic biochar disclosed by the invention has magnetism, so that the magnetic biochar is convenient to recover and beneficial to reuse.
4. When the magnetic biochar disclosed by the invention is used for carrying out enhanced anaerobic treatment on chemical wastewater, the COD removal rate can reach 60-80% when the retention time is 120 hours.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by the specific embodiments.
Example 1
A preparation method of magnetic biochar comprises the following steps:
s1, crushing the biological straws, sieving, repeatedly cleaning with acid and clear water, and drying;
s2, washing the scrap iron with water, and adding acid to dissolve to obtain a reaction solution; the mass volume ratio of the scrap iron to the acid is 1: 2;
s3, adding the biological straws dried in the step 1 into the reaction liquid, wherein the mass volume of the biological straws and the reaction liquid is 1: 2, after fully stirring, transferring the mixture into a hydrothermal reaction kettle for hydrothermal reaction, wherein the reaction temperature of the hydrothermal reaction is 180 ℃, the reaction time is 8 hours, and sieving a product after the reaction to obtain a solid product;
s4, washing the solid product for several times by adopting an ethanol solution, and drying at 105 ℃ to obtain the magnetic biochar.
Adding 2L of pesticide wastewater with COD concentration of 1700-1800mg/L into an anaerobic reactor for inoculating anaerobic activated sludge, adding 1.2g of the magnetic biochar into the anaerobic reactor, wherein the pH value of inlet water is 8, the reaction retention time is 96h, and the reaction temperature is 35 ℃. The COD concentration of the effluent is 300-400 mg/L.
Example 2
A preparation method of magnetic biochar comprises the following steps:
s1, crushing the biological straws, sieving, repeatedly cleaning with acid and clear water, and drying;
s2, washing the scrap iron with water, and adding acid to dissolve to obtain a reaction solution; the mass volume ratio of the scrap iron to the acid is 1: 3;
s3, adding the biological straws dried in the step 1 into the reaction liquid, wherein the mass volume of the biological straws and the reaction liquid is 3: 2, after fully stirring, transferring the mixture into a hydrothermal reaction kettle for hydrothermal reaction, wherein the reaction temperature of the hydrothermal reaction is 220 ℃, the reaction time is 6 hours, and sieving a product after the reaction to obtain a solid product;
s4, washing the solid product for several times by adopting an ethanol solution, and drying at 105 ℃ to obtain the magnetic biochar.
Adding 2L of certain coal gas wastewater with COD concentration of 2500-3000mg/L into an anaerobic reactor inoculated with anaerobic activated sludge, adding 2g of the magnetic biochar into the anaerobic reactor, wherein the pH value of inlet water is 8, the reaction retention time is 120h, and the reaction temperature is 35 ℃. The COD concentration of the effluent is 700-800 mg/L.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent technical solutions made by using the contents of the present invention in the specification can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.
Claims (7)
1. The preparation method of the magnetic biochar is characterized by comprising the following steps:
s1, crushing the biological straws, screening, cleaning and drying;
s2, washing the waste scrap iron, and adding acid to dissolve to obtain a reaction solution;
s3, adding the dried biological straws obtained in the step 1 into the reaction liquid, fully stirring, carrying out hydrothermal reaction, and sieving the product after the reaction to obtain a solid product;
and S4, washing the solid product by using an organic solution for a plurality of times, and drying to obtain the magnetic biochar.
2. The method according to claim 1, wherein in S2, the mass-to-volume ratio of scrap iron pieces to acid is 1: 2-1: 3.
3. the preparation method of claim 1, wherein in S3, the mass volume of the biological straw and the reaction solution is 1: 4-4: 1.
4. the method according to claim 1, wherein the hydrothermal reaction in S3 is carried out at a reaction temperature of 150 ℃ to 250 ℃.
5. The method according to claim 1, wherein in S3, the hydrothermal reaction is carried out for a reaction time of 4 to 10 hours.
6. The application of the magnetic biochar obtained by the preparation method of any one of claims 1 to 5 in the enhanced anaerobic treatment of chemical wastewater is characterized in that the treatment method comprises the following steps: adding industrial wastewater with COD concentration of 2000-3000mg/L into an anaerobic reactor inoculated with anaerobic activated sludge, adding the magnetic biochar into the anaerobic reactor, wherein the pH value of inlet water is 7.5-8.5, the reaction residence time is 90-120h, and the reaction temperature is 25-35 ℃.
7. The use of claim 6, wherein the added mass of the magnetic biochar is 0.02-0.1% of the volume of the inlet water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111642774.0A CN114230005A (en) | 2021-12-30 | 2021-12-30 | Preparation method and application of magnetic biochar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111642774.0A CN114230005A (en) | 2021-12-30 | 2021-12-30 | Preparation method and application of magnetic biochar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114230005A true CN114230005A (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111642774.0A Pending CN114230005A (en) | 2021-12-30 | 2021-12-30 | Preparation method and application of magnetic biochar |
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| CN (1) | CN114230005A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108862852A (en) * | 2018-07-04 | 2018-11-23 | 东华大学 | A kind of method that magnetic bio charcoal strengthens dyeing waste water biological denitrificaion |
| CN109609556A (en) * | 2018-12-07 | 2019-04-12 | 西安建筑科技大学 | A kind of synergisting method of anaerobic fermentation |
| US20200055762A1 (en) * | 2017-05-01 | 2020-02-20 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada, Re | Method for conversion of wet biomass to energy |
| CN111604082A (en) * | 2020-06-23 | 2020-09-01 | 河南师范大学 | Preparation method of iron-loaded biochar, product and application of product |
| CN112194244A (en) * | 2020-08-24 | 2021-01-08 | 山东大学 | Lanthanum-modified constructed wetland biochar substrate prepared by hydrothermal method and preparation method thereof |
| CN112938929A (en) * | 2021-02-09 | 2021-06-11 | 同济大学 | Method for efficiently preparing magnetic biochar from straws and application |
| WO2021114441A1 (en) * | 2019-12-13 | 2021-06-17 | 南京师范大学 | Iron-rich plant-based magnetic biochar, preparation method for same, and application |
| CN113636650A (en) * | 2021-10-19 | 2021-11-12 | 广东卓信环境科技股份有限公司 | Biological treatment method and system for enhancing sewage denitrification function by carbon-rich magnetic biochar |
-
2021
- 2021-12-30 CN CN202111642774.0A patent/CN114230005A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200055762A1 (en) * | 2017-05-01 | 2020-02-20 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada, Re | Method for conversion of wet biomass to energy |
| CN108862852A (en) * | 2018-07-04 | 2018-11-23 | 东华大学 | A kind of method that magnetic bio charcoal strengthens dyeing waste water biological denitrificaion |
| CN109609556A (en) * | 2018-12-07 | 2019-04-12 | 西安建筑科技大学 | A kind of synergisting method of anaerobic fermentation |
| WO2021114441A1 (en) * | 2019-12-13 | 2021-06-17 | 南京师范大学 | Iron-rich plant-based magnetic biochar, preparation method for same, and application |
| CN111604082A (en) * | 2020-06-23 | 2020-09-01 | 河南师范大学 | Preparation method of iron-loaded biochar, product and application of product |
| CN112194244A (en) * | 2020-08-24 | 2021-01-08 | 山东大学 | Lanthanum-modified constructed wetland biochar substrate prepared by hydrothermal method and preparation method thereof |
| CN112938929A (en) * | 2021-02-09 | 2021-06-11 | 同济大学 | Method for efficiently preparing magnetic biochar from straws and application |
| CN113636650A (en) * | 2021-10-19 | 2021-11-12 | 广东卓信环境科技股份有限公司 | Biological treatment method and system for enhancing sewage denitrification function by carbon-rich magnetic biochar |
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