CN115304163A - Preparation method of biochar loaded nano-iron modified composite material for constructed wetland filler - Google Patents
Preparation method of biochar loaded nano-iron modified composite material for constructed wetland filler Download PDFInfo
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- CN115304163A CN115304163A CN202111219419.2A CN202111219419A CN115304163A CN 115304163 A CN115304163 A CN 115304163A CN 202111219419 A CN202111219419 A CN 202111219419A CN 115304163 A CN115304163 A CN 115304163A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 239000000945 filler Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 239000011574 phosphorus Substances 0.000 claims abstract description 7
- 238000001179 sorption measurement Methods 0.000 claims abstract description 5
- 238000005189 flocculation Methods 0.000 claims abstract 2
- 230000016615 flocculation Effects 0.000 claims abstract 2
- 238000001556 precipitation Methods 0.000 claims abstract 2
- 229910002651 NO3 Inorganic materials 0.000 claims description 28
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 28
- 239000010949 copper Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 7
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 7
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 239000011591 potassium Substances 0.000 claims description 5
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000009777 vacuum freeze-drying Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000197 pyrolysis Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 235000014676 Phragmites communis Nutrition 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 244000005700 microbiome Species 0.000 abstract description 6
- 239000003610 charcoal Substances 0.000 abstract description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 abstract 1
- 229910001447 ferric ion Inorganic materials 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 abstract 1
- 239000007791 liquid phase Substances 0.000 abstract 1
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910002549 Fe–Cu Inorganic materials 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 5
- 239000002352 surface water Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 241000894007 species Species 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910001431 copper ion Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 208000012868 Overgrowth Diseases 0.000 description 1
- 241000425347 Phyla <beetle> Species 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- 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
- C02F3/005—Combined electrochemical biological processes
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
-
- 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
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
- C02F2003/003—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms using activated carbon or the like
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Botany (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Molecular Biology (AREA)
- Compounds Of Iron (AREA)
Abstract
The invention provides a novel biochar loaded nano-iron modified composite material. The method is characterized in that biochar at different temperatures is used as a carrier, and a liquid phase reduction method is utilized to prepare the composite material. The prepared charcoal-loaded nano-iron modified composite material has the capability of providing an electron donor for denitrifying microorganisms in the artificial wetland, and the denitrification effect of the artificial wetland can be improved through the process. In addition, the biochar loaded nano-iron modified composite material serving as a novel filler can generate ferric ions and cupric ions to adsorb phosphorus, and can remove phosphorus by precipitation, adsorption and flocculation by using metal oxides on the surface of the biochar as active adsorption sites. Compared with the traditional constructed wetland to which the biochar loaded nano iron modified composite material is not added, the phosphorus removal efficiency of the added group can reach more than 5 times of that of the non-added group.
Description
Technical Field
The invention relates to the field of constructed wetland fillers, in particular to a method for preparing a novel constructed wetland filler by applying a biochar loaded nano iron modified composite material. The novel filler prepared by the invention has the advantage of selectively removing nitrate and has high phosphorus removal efficiency.
Background
Nitrate (NO) 3 - ) Is one of the most prevalent pollutants in surface water worldwide. Nitrate can stimulate overgrowth of aquatic plants such as algae when flowing into aquatic ecological environments such as lakes and rivers along with surface water, thereby directly or indirectly damaging aquatic organisms through toxic effects or oxygen consumption and causing eutrophication of water bodies. In addition, if nitrate is reduced to Nitrite (NO) by natural or artificial processes 2 - ) Can pose a great threat to human health, especially to infants. Methods for removing nitrate from surface water typically include physicochemical and biological methods. Reverse osmosis, ion exchange, electrodialysis, etc., are not suitable for large-scale applications due to the disadvantages of low efficiency, high cost, harmful by-products, etc. Therefore, an environment-friendly, low-cost and efficient technology for treating the nitrate in the surface water is urgently needed.
The constructed wetland has become a water pollution treatment technology which is widely concerned due to the advantages of low cost, simple maintenance, simple operation, environmental protection and the like. The traditional artificial wetland taking quartz sand, gravel and ceramsite as the matrix has good removal effect on suspended matters and organic matters due to the adsorption effect and plant absorption effect of the matrix, but has poor removal performance on pollution such as nitrate. The nitrate removing mechanism of the artificial wetland mainly comprises plant absorption, ion exchange and the action of various microorganisms, wherein the biological denitrification is the most main way, and the nitrate is converted into nitrite by denitrifying bacteria and further converted into nitric oxide to finally form nitrogen so as to achieve the aim of removing the nitrate. Sufficient electron donors are required for artificial wetland denitrification, but the nitrate-containing surface water is usually lack of electron donors, so that the removal efficiency of the nitrate by the artificial wetland is low. Before this, the complete denitrification of the artificial wetland is ensured by adding organic carbon sources such as methanol, sodium acetate and the like as electron donors. However, the cost is high, the input amount is difficult to control, secondary pollution is possibly caused, and the like, so that the application of the artificial wetland is limited. Therefore, there is a need to find an environment-friendly, low-cost, easily recyclable electron donor to improve nitrate removal in artificial wetlands.
At present, the invention on how to selectively improve the nitrate purification effect in the constructed wetland is less, and the theory and research of the system are lacked. The invention utilizes the biochar loaded nano iron modified composite material to improve the selective removal of nitrate from the constructed wetland and reveal the action mechanism of the nitrate.
Disclosure of Invention
In order to overcome the defects of the traditional constructed wetland and improve the selective removal efficiency of nitrate in the constructed wetland, the invention provides a method for preparing a novel filler for the constructed wetland by using a biochar-loaded nano iron material.
The preparation method for preparing the artificial wetland novel filler by using the charcoal-loaded nano iron composite material adopts the following technical scheme:
sequentially adding the biochar into CuSO 4 ·5H 2 O、FeSO 4 ·7H 2 Shaking and shaking the solution O evenly. Then, the freshly prepared excessive potassium borohydride solution and polyvinylpyrrolidone are dropped into the mixture, stirred for 30 minutes and then washed. In the process, the bimetal iron and copper is fixed on the surface of the biochar to obtain the novel artificial wetland filler of the biochar loaded nano iron material.
A method for preparing a novel filler for artificial wetland from a biochar-loaded nano-iron material comprises the following steps:
(1) Adding a certain amount of charcoal into CuSO 4 ·5H 2 In the O solution, after shaking for 1 hour, washing for 3 times by deionized water;
(2) Adding the sample obtained in the step (1) into FeSO 4 ·7H 2 O solution (2.78 g. L) -1 ) Shaking for 1 hour;
(3) And (3) dripping the freshly prepared excess potassium borohydride solution and 100mg of polyvinylpyrrolidone into the mixture in the step (2), stirring for 30 minutes, and then washing. In the process, the iron-copper bimetal is fixed on the surface of the biochar to obtain the novel artificial wetland filler of the biochar loaded nano iron modified composite material.
(4) And finally, separating the biochar-loaded nano iron modified composite material from water by using a strong magnet, and performing vacuum freeze drying and storage.
During the preparation process, different copper and iron proportions are adjusted by changing the initial copper ion solution.
Preferably, the adding proportion of the iron, the copper and the biochar in the steps (1) and (2) is as follows by mass: 1: 0.5: 3, 1: 3, 1: 2: 3, 1: 0.5: 2, 1: 2, 1: 0.5: 4, 1: 4, 1: 2: 4.
The biochar loaded nano-iron composite material used in the invention can be synthesized in a large scale and the synthesis method is simple. The novel filler for the artificial wetland, prepared by the invention, can be used for removing nitrate in the artificial wetland, and has high removal efficiency and good stability. The invention has simple preparation process, simple and easily obtained raw materials, does not need expensive equipment, and has wide development prospect in the future large-scale application of the artificial wetland filler.
Drawings
Fig. 1 is a process diagram for manufacturing the novel filler for the artificial wetland.
Fig. 2 is an SEM image of the biochar-supported nano-iron-based composite material, and a clear porous structure can be seen.
Fig. 3-4 are TEM images and XRD-XPS images of the composite material with nano iron supported on biochar, which shows that the bimetal iron and copper is successfully supported on the biochar and that the distinct nano-pore structure is visible.
Fig. 5 is a graph of different irons: copper: the ratio of the biochar and the addition amount of the novel biochar loaded nano iron modified composite material to the removal effect of nitrate and the selectivity graph of nitrate to nitrite, ammonia nitrogen and nitrogen are shown.
Fig. 6 is a diagram showing the change of the effluent quality of the artificial wetland.
FIG. 7 shows the indexes of abundance and diversity of microorganisms (CWC is a control group constructed wetland, A1 is a Fe-Cu/BC500 addition group constructed wetland, A2 is a Fe-Cu/BC700 addition group constructed wetland, A3 is a Fe-Cu/BC900 addition group constructed wetland, and Fe-Cu/BC500, fe-Cu/BC700 and Fe-Cu/BC900 are new biochar-prepared biochar-loaded nano iron-based modified composite materials under the conditions of 500 ℃, 700 ℃ and 900 ℃) respectively.
Fig. 8 is a diagram of species composition (a), class species composition (b) and genus species composition (c) of phyla of the artificial wetland.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
The invention relates to a method for preparing a novel artificial wetland filler by using a novel biochar loaded nano-iron modified composite material, which comprises the step of sequentially adding CuSO into biochar 4 ·5H 2 O、FeSO 4 ·7H 2 Shaking the solution O evenly. Then the freshly prepared excess KBH 4 The solution and polyvinylpyrrolidone were dropped into the mixture, stirred for 30 minutes and then washed. In the process, the iron-copper bimetallic is fixed on the surface of the biochar to obtain the novel artificial wetland filler of the biochar loaded with the nano iron material.
The present invention will be described in detail with reference to specific examples.
The first embodiment is as follows: firstly, 1.16g of biochar is added with CuSO 4 ·5H 2 O solution (2.50 g. L) -1 ) After shaking for 1 hour, washing with deionized water for 3 times; adding it to FeSO 4 ·7H 2 O solution (2.78 g. L) -1 ) Shaking for 1 hour. Then, an excess amount of freshly prepared potassium borohydride solution and 100mg of polyvinylpyrrolidone were dropped into the mixture, stirred for 30 minutes, and then washed. In the process, the iron and copper double metals are fixed on the surface of the biochar to obtain the new productThe biological carbon loaded nano iron modified composite material. Finally, separating the novel biochar-loaded nano iron modified composite material from water by using a strong magnet, and performing vacuum freeze-drying and storage. During the preparation process, different iron-copper ratios are adjusted by changing the initial divalent copper ion solution. The nitrate removal test results of different iron, copper and charcoal ratios in batch tests show that the nitrate removal rate of the novel filler can reach 97%, and the selectivity of the novel filler to nitrogen can reach 31%.
Example two: nitrate removal test results in batch tests of biochar preparation (700 ℃ pyrolysis biochar) at different iron and copper and optimal temperature conditions show that the nitrate removal rate can reach 98% and the selectivity to nitrogen can reach 31% under different iron, copper and biochar addition conditions.
Example three: the novel biochar-loaded nano-iron modified composite material is added to four constructed wetlands, and the test results for removing nitrate, ammonia nitrogen, nitrite, biochemical oxygen demand and total phosphorus in the constructed wetlands show that the removal rate of the constructed wetlands to the nitrate can reach 66.5 percent and is higher than that of a control group by 46.5 percent under the condition that the novel biochar-loaded nano-iron modified composite material is added. As with the removal of nitrate, the removal efficiency of the iron, copper and biochar added artificial wetland on ammonia nitrogen, nitrite and total phosphorus is also higher than that of a control group. However, the removal efficiency of the biochemical oxygen demand of the artificial wetland added with the novel biochar loaded nano-iron modified composite material is inferior to that of a control group, because the addition of the novel biochar loaded nano-iron modified composite material can reduce the demand of denitrification on organic matters, so that the biochemical oxygen demand concentration of effluent is increased.
Example four: the traditional nano material has certain toxicity to microorganisms, so that the microorganisms of four constructed wetlands are analyzed after the constructed wetlands operate for a period of time. Results show that the Pielou uniformity indexes of three constructed wetlands added with the novel biochar loaded nano-iron modified composite material and constructed wetlands added with no novel biochar loaded nano-iron modified composite material are 67%, 63%, 68% and 56% respectively. The result shows that the microorganism uniformity in the artificial wetland is improved by adding the novel biochar loaded nano iron modified composite material as the novel artificial wetland filler.
It should be understood that while the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein, and any combination of the various embodiments may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (5)
1. A novel filler for artificial wetland prepared from biochar loaded nano-iron modified composite material is characterized in that CuSO is added into the biochar in sequence 4 ·5H 2 O、FeSO 4 ·7H 2 Shaking and shaking the solution O evenly. Then excess potassium borohydride (KBH) 4 ) The solution and polyvinylpyrrolidone (PVP) were dropped into the mixture. In the process, the iron-copper bimetal is fixed on the surface of the biochar to obtain the novel artificial wetland filler of the biochar loaded with the nano iron material.
2. The biochar-loaded nano-iron-based modified composite material as claimed in claim 1, is characterized in that: the reed is washed, dried and crushed, and then is sieved by a 0.15mm sieve to be used as a raw material for manufacturing the biochar. The biochar is obtained by limited-oxygen pyrolysis for 1 hour at 500 ℃, 700 ℃ and 900 ℃ by utilizing a muffle furnace.
3. The biochar-loaded nano-iron-based modified composite material as claimed in claim 1, is characterized in that: the material shows high-efficiency electron transport capacity, has a large number of active adsorption sites, and can remove phosphorus through precipitation, adsorption and flocculation in addition to efficiently and selectively removing nitrate.
4. The novel filler for artificial wetlands according to claim 1, which is characterized in that: the adding proportion of the iron, the copper and the biochar is as follows by mass: 1: 0.5: 3, 1: 3, 1: 2: 3, 1: 0.5: 2, 1: 2, 1: 0.5: 4, 1: 4, 1: 2: 4.
5. The method for preparing the novel filler for artificial wetlands according to any one of claims 1 to 4, which is characterized in that: the preparation method comprises the following steps:
(1) Firstly, 1.16g of biochar is added with CuSO 4 ·5H 2 O solution (2.50 g. L) -1 ) After shaking for 1 hour, washing with deionized water for 3 times;
(2) Preferably, the preparation (1) is added to FeSO 4 ·7H 2 O solution (2.78 g. L) -1 ) Shaking for 1 hour. Then, the freshly prepared excess potassium borohydride solution and 100mg polyvinylpyrrolidone are dropped into the mixture, stirred for 30 minutes and then washed
(3) Preferably, the biological carbon-supported nano iron-based composite material is separated from water by a strong magnet and is stored by vacuum freeze drying.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116393112A (en) * | 2023-03-10 | 2023-07-07 | 山东科技大学 | Preparation method of iron-carbon particles and reinforced constructed wetland dephosphorization method based on iron-carbon particles |
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| CN110015742A (en) * | 2019-04-30 | 2019-07-16 | 生态环境部华南环境科学研究所 | A kind of water hyacinth charcoal load nano zero-valence iron composite material and preparation and application |
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| CN110015742A (en) * | 2019-04-30 | 2019-07-16 | 生态环境部华南环境科学研究所 | A kind of water hyacinth charcoal load nano zero-valence iron composite material and preparation and application |
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| Title |
|---|
| WEIHAO HOU ET AL: "Influence of modified biochar supported Fe–Cu/polyvinylpyrrolidone on nitrate removal and high selectivity towards nitrogen in constructed wetlands", ENVIRONMENTAL POLLUTION, pages 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116393112A (en) * | 2023-03-10 | 2023-07-07 | 山东科技大学 | Preparation method of iron-carbon particles and reinforced constructed wetland dephosphorization method based on iron-carbon particles |
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