CN116332340A - Biochar scrap iron coupling filler and preparation method and application thereof - Google Patents
Biochar scrap iron coupling filler and preparation method and application thereof Download PDFInfo
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- CN116332340A CN116332340A CN202310117142.5A CN202310117142A CN116332340A CN 116332340 A CN116332340 A CN 116332340A CN 202310117142 A CN202310117142 A CN 202310117142A CN 116332340 A CN116332340 A CN 116332340A
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- biochar
- scrap iron
- iron coupling
- coupling filler
- ceramsite
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 68
- 239000000945 filler Substances 0.000 title claims abstract description 50
- 230000008878 coupling Effects 0.000 title claims abstract description 43
- 238000010168 coupling process Methods 0.000 title claims abstract description 43
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 26
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 24
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 230000020477 pH reduction Effects 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 13
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 12
- 229910017604 nitric acid Inorganic materials 0.000 claims description 12
- 241000353135 Psenopsis anomala Species 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 239000000126 substance Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- ANJIDHKQUCZNQY-UHFFFAOYSA-N 1-(1-benzofuran-2-yl)-n-methylpropan-2-amine Chemical compound C1=CC=C2OC(CC(C)NC)=CC2=C1 ANJIDHKQUCZNQY-UHFFFAOYSA-N 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 230000027756 respiratory electron transport chain Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000005575 MCPB Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 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
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
- -1 nitrate ions Chemical class 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
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
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- 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
-
- 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
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)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to the technical field of tail water nitrate purification, in particular to a biochar scrap iron coupling filler, and a preparation method and application thereof. The preparation method of the biochar scrap iron coupling filler comprises the following steps: mixing biochar with acid liquor, performing acidification treatment, and grinding to obtain modified biochar; mixing the ceramsite with the adhesive to obtain ceramsite covered with the adhesive for later use; mixing the modified biochar, the scrap iron and the ceramsite covered with the adhesive, and standing to obtain the biochar scrap iron coupling filler. The biochar scrap iron coupling filler has two ways of chemical denitrification and biological denitrification for removing nitrate, does not need additional organic matters, and has good nitrate removal effect and low operation cost.
Description
Technical Field
The invention relates to the technical field of tail water nitrate purification, in particular to a biochar scrap iron coupling filler, and a preparation method and application thereof.
Background
Enrichment of nitrate nitrogen in water is an increasing concern in the environmental field. The nitrogen pollution causes eutrophication of the water body, damages human health and damages the ecological system. System management of nitrate nitrogen in secondary effluent and municipal water streams remains a challenge. In addition, nitrate-contaminated wastewater and groundwater have a relatively low carbon-nitrogen ratio, resulting in an inadequate carbon source for denitrification reactions, and lack of mature and cost-effective treatment technologies.
The prior art uses thiosulfate, methanol, acetic acid and other exogenous organic sources to maintain high denitrification rate, but has secondary pollution of inorganic degradation products and organic residues. Then, autotrophic denitrification without additional carbon source is more feasible for practical water treatment process, and secondary pollution is minimal.
Iron is a rich element in nature and deeply influences the geochemical circulation of nitrogen. Due to the strong reducing potential of iron, a great deal of research has been applied to the removal of nitrate by chemical and biological routes. Iron is a widely used material, widely used for nitrate removal. However, the use of iron in nitrate degradation is limited by the rate of electron transfer, resulting in a lower rate of nitrate removal using iron.
Therefore, how to provide a method for high adsorption efficiency of nitrate nitrogen in water is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a biochar scrap iron coupling filler, and a preparation method and application thereof, so as to solve the defects in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of biochar scrap iron coupling filler, which comprises the following steps:
(1) Mixing biochar with acid liquor, performing acidification treatment, and grinding to obtain modified biochar;
(2) Mixing the ceramsite with the adhesive to obtain ceramsite covered with the adhesive for later use;
(3) Mixing the modified biochar, scrap iron and ceramic particles covered with the adhesive, and standing to obtain biochar scrap iron coupling filler;
the step (1) and the step (2) are not in sequence.
Preferably, the solid-to-liquid ratio of the biochar to the acid liquor is 1:2-4; the acid liquor is a mixed solution of hydrochloric acid and nitric acid, the concentration of the nitric acid in the acid liquor is 0.3-0.5 mol/L, and the concentration of the hydrochloric acid is 0.15-0.25 mol/L.
Preferably, the acidification treatment is carried out by mixing the biochar with acid liquor and then vibrating, and the acidification treatment time is 2-3 hours.
Preferably, the mass ratio of the modified biochar to the scrap iron is 1:1.8-2.2;
the mass ratio of the biochar to the ceramsite is 0.8-1.2:50;
the mass ratio of the adhesive to the ceramsite is 0.8-1.2:20.
Preferably, the particle size of the modified biochar is less than or equal to 18 meshes; the particle size of the ceramsite is 10-20 nm.
Preferably, the standing time of the step (3) is 22-26 hours.
The invention also provides the biochar scrap iron coupling filler prepared by the preparation method.
The invention also provides application of the biochar scrap iron coupling filler for removing nitrate.
Preferably, the biochar scrap iron coupling filler is used for the denitrification reaction column.
Preferably, the bottom of the denitrification reaction column is melon seed slices, and the upper part is biochar scrap iron coupling filler; the volume ratio of the melon seed slices to the biochar scrap iron coupling filler is 1:1.8-2.2.
Compared with the prior art, the invention has the following beneficial effects:
1. the biochar scrap iron coupling filler has two ways of chemical denitrification and biological denitrification for removing nitrate, does not need additional organic matters, and has good nitrate removal effect and low operation cost.
2. The biochar in the biochar scrap iron coupling filler can remove a part of nitrate in the water body in a physical adsorption mode.
3. The biochar scrap iron coupling filler has the advantages of simple manufacturing process, easily obtained raw materials and low overall cost.
Drawings
FIG. 1 shows the nitrate concentration of the inlet and outlet water of the denitrification reaction column prepared by the packing materials of example 2 and comparative examples 1 to 4, respectively;
FIG. 2 shows the nitrogen changes for each form of 2-MAPB prepared in example 2.
Detailed Description
The invention provides a preparation method of biochar scrap iron coupling filler, which comprises the following steps:
(1) Mixing biochar with acid liquor, performing acidification treatment, and grinding to obtain modified biochar;
(2) Mixing the ceramsite with the adhesive to obtain ceramsite covered with the adhesive for later use;
(3) Mixing the modified biochar, scrap iron and ceramic particles covered with the adhesive, and standing to obtain biochar scrap iron coupling filler;
the step (1) and the step (2) are not in sequence.
In the invention, the solid-to-liquid ratio of the biochar to the acid liquor is 1:2-4, preferably 1:2.5-3.5; the acid liquor is a mixed solution of hydrochloric acid and nitric acid, the concentration of the nitric acid in the acid liquor is 0.3-0.5 mol/L, preferably 0.35-0.45 mol/L, and the concentration of the hydrochloric acid is 0.15-0.25 mol/L, preferably 0.18-0.22 mol/L.
In the invention, the acidification treatment is to mix the biochar with the acid liquor and then shake the mixture, wherein the acidification treatment time is 2-3 hours, preferably 2.2-2.6 hours, and more preferably 2.3-2.5 hours.
In the invention, the mass ratio of the modified biochar to the scrap iron is 1:1.8-2.2, preferably 1:1.9-2.1;
the mass ratio of the biochar to the ceramsite is 0.8-1.2:50, preferably 0.9-1:50;
the mass ratio of the adhesive to the ceramsite is 0.8-1.2:20, preferably 0.9-1.1:20.
In the invention, the particle size of the modified biochar is less than or equal to 18 meshes, preferably less than or equal to 20 meshes; the particle size of the ceramsite is 10-20 nm, preferably 12-18 nm.
In the present invention, the time for the standing in the step (3) is 22 to 26 hours, preferably 25 to 25 hours.
The invention also provides the biochar scrap iron coupling filler prepared by the preparation method.
The invention also provides application of the biochar scrap iron coupling filler for removing nitrate.
In the invention, biochar scrap iron coupling filler is used for a denitrification reaction column.
In the invention, melon seed slices are arranged at the bottom of the denitrification reaction column, and biochar scrap iron is arranged at the upper part of the denitrification reaction column to be coupled with filler; the volume ratio of the melon seed slices to the biochar scrap iron coupling filler is 1:1.8-2.2, and is preferably 1:1.9 to 2.1.
In the invention, the melon seed slices can be replaced by other common water purification materials such as quartz sand, zeolite and the like.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
(1) Mixing biochar and acid liquor according to a solid-to-liquid ratio of 1:2, vibrating for 20 hours, filtering out the biochar by deionized water, washing until filtrate is colorless, taking out the biochar, grinding the biochar by a ball mill until the biochar passes through a 20-mesh sieve to obtain modified biochar, wherein the acid liquor is a mixed solution of hydrochloric acid and nitric acid, the concentration of nitric acid in the acid liquor is 0.3mol/L, and the concentration of hydrochloric acid is 0.15mol/L;
(2) Mixing the ceramsite with phenolic resin according to the mass ratio of 20:0.8, and uniformly coating an adhesive on the surface of the ceramsite to obtain the ceramsite covered with the adhesive for later use;
(3) Firstly mixing modified biochar and scrap iron, then pouring the mixture into a roller mixer together with ceramic particles covered with an adhesive, setting the rotating speed to be 80r/min and the running time to be 10min, and standing the prepared filler at a ventilation place for 24 hours after the completion of the operation to stabilize the filler, thereby obtaining the biochar and scrap iron coupling filler, wherein the mass ratio of the modified biochar to the scrap iron is 1:1.8 and the mass ratio of the biochar to the ceramic particles is 0.8:50.
Example 2
(1) Mixing biochar and acid liquor according to a solid-to-liquid ratio of 1:3, vibrating for 24 hours, filtering out the biochar by deionized water, washing until filtrate is colorless, taking out the biochar, grinding the biochar by a ball mill until the biochar passes through an 18-mesh sieve to obtain modified biochar, wherein the acid liquor is a mixed solution of hydrochloric acid and nitric acid, the concentration of nitric acid in the acid liquor is 0.4mol/L, and the concentration of hydrochloric acid is 0.2mol/L;
(2) Mixing ceramsite and phenolic resin according to a mass ratio of 20:1, and uniformly coating an adhesive on the surface of the ceramsite to obtain the ceramsite covered with the adhesive for later use;
(3) Firstly mixing modified biochar and scrap iron, then pouring the mixture into a roller mixer together with ceramic particles covered with an adhesive, setting the rotating speed to be 80r/min and the running time to be 10min, and standing the prepared filler at a ventilation place for 24 hours after the completion of the operation to stabilize the filler, thereby obtaining the biochar and scrap iron coupling filler, wherein the mass ratio of the modified biochar to the scrap iron is 1:2 and the mass ratio of the biochar to the ceramic particles is 1:50.
Example 3
(1) Mixing biochar and acid liquor according to a solid-to-liquid ratio of 1:4, vibrating for 28 hours, filtering out the biochar by deionized water, washing until filtrate is colorless, taking out the biochar, grinding the biochar by a ball mill until the biochar passes through an 18-mesh sieve, and obtaining modified biochar, wherein the acid liquor is a mixed solution of hydrochloric acid and nitric acid, the concentration of nitric acid in the acid liquor is 0.5mol/L, and the concentration of hydrochloric acid is 0.25mol/L;
(2) Mixing the ceramsite with phenolic resin according to the mass ratio of 20:1.2, and uniformly coating an adhesive on the surface of the ceramsite to obtain the ceramsite covered with the adhesive for later use;
(3) Firstly mixing modified biochar and scrap iron, then pouring the mixture into a roller mixer together with ceramic particles covered with an adhesive, setting the rotating speed to be 80r/min and the running time to be 10min, and standing the prepared filler at a ventilation place for 24 hours after the completion of the operation to stabilize the filler, thereby obtaining the biochar and scrap iron coupling filler, wherein the mass ratio of the modified biochar to the scrap iron is 1:2.2 and the mass ratio of the biochar to the ceramic particles is 1.2:50.
Comparative example 1
Comparative example 1 differs from example 2 in that no iron filings were added to the prepared filler.
Comparative example 2
Comparative example 2 is different from example 2 in that the mass ratio of the scrap iron to the modified biochar is 1:1.
Comparative example 3
Comparative example 3 differs from example 2 in that no modified biochar was added to the prepared filler.
Comparative example 4
Comparative example 4 differs from example 2 in that the biochar used was unmodified biochar.
Test case
A cylindrical PVC pipe with the height of 60cm and the diameter of 16cm is used as the main body of the denitrification reactor, one end of the main body is sealed by a PVC pipe cover combined with waterproof glue, and holes are punched at the height of 10cm and 40cm of the column body for water outlet and water inlet;
cleaning melon seed slices with deionized water, placing the melon seed slices at the bottom of a reaction column, and filling biochar scrap iron coupling filler on the melon seed slices, wherein the volume ratio of the melon seed slices to the biochar scrap iron coupling filler is 1:2.
The packing prepared in example 2 and comparative examples 1 to 4 was used in a denitrification reaction column, wherein example 2 was designated as 2-MAPB, comparative example 1 was designated as C-MAPB, comparative example 2 was designated as 1-MAPB, comparative example 3 was designated as M-MAPB, and comparative example 4 was designated as 2-MCPB.
Through a flow test (the configuration of the test water inflow is shown in table 1) for 137d, nitrogen in each form in the water body is measured, and the measuring methods are all measured according to the national standard method (total nitrogen HJ 636-2012 and nitrate nitrogen HJ/T346-2007). The test is carried out in three stagesThe water body configuration of each stage is shown in figure 1. As shown in FIG. 1, each denitrification reactor exhibits a certain denitrification potential throughout the three stages, and the 2-MAPB exhibits consistent and efficient denitrification capability under different operating conditions. During continuous operation 137d, 2-MAPB achieves maximum NO 3 - The removal rate of N is 97.6+/-1.25%, so that the basic removal of nitrate is realized.
C-MAPB has denitrification potential under high nitrate-intake conditions, probably due to the adsorption capacity of biochar on nitrate ions. As with the other three iron-containing reactors, the denitrification load of M-MAPB does not increase with increasing nitrate concentration, indicating that the denitrification potential of iron-only M-MAPB is inhibited in high nitrate environments. As shown in FIG. 2, by observing the morphological changes of nitrogen in 2-MAPB, a combined chemical and biological denitrification process exists in the denitrification reactor. Throughout the experimental period, the maximum nitrate removal of 2-MAPB was 99.26%. At the same time, a higher ammonia formation rate was observed at long HRT, which means that chemical denitrification reactions require a minimum HRT of more than 12 hours to interact adequately. By comparing the nitrate removal rates of 2-MAPB in the first and second stages, the denitrification performance of 2-MAPB was least affected.
In addition, the denitrification reaction column prepared from 2-MCPB can improve denitrification load compared with 2-MAPB. This is due to the fact that the acid modification increases the electron transfer capacity of the biochar, thereby accelerating the electron transfer from mZVI to nitrate, which is just the rate limiting factor of the chemical denitrification pathway. In addition, 2-MAPB exhibits a stronger nitrate removal capacity than 1-MAPB in stages 1 and 2, indicating that the 2:1 iron-carbon blend ratio has the best nitrate removal effect. C-MAPB, with or without iron filings, showed weak denitrification capacity in the second and third stages (48-137 days), indicating that mixed denitrification mainly occurs in the presence of iron. Overall, 2-MAPB exhibits the most excellent denitrification performance.
Table 1 test water inlet configuration
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The preparation method of the biochar scrap iron coupling filler is characterized by comprising the following steps of:
(1) Mixing biochar with acid liquor, performing acidification treatment, and grinding to obtain modified biochar;
(2) Mixing the ceramsite with the adhesive to obtain ceramsite covered with the adhesive for later use;
(3) Mixing the modified biochar, scrap iron and ceramic particles covered with the adhesive, and standing to obtain biochar scrap iron coupling filler;
the step (1) and the step (2) are not in sequence.
2. The method for preparing the biochar scrap iron coupling filler according to claim 1, wherein the solid-to-liquid ratio of the biochar to the acid liquor is 1:2-4; the acid liquor is a mixed solution of hydrochloric acid and nitric acid, the concentration of the nitric acid in the acid liquor is 0.3-0.5 mol/L, and the concentration of the hydrochloric acid is 0.15-0.25 mol/L.
3. The method for preparing the biochar scrap iron coupling filler according to claim 1 or 2, wherein the acidification treatment is carried out by mixing biochar with acid liquor and then vibrating, and the acidification treatment time is 2-3 h.
4. The preparation method of the biochar scrap iron coupling filler according to claim 1, which is characterized in that the mass ratio of the modified biochar to the scrap iron is 1:1.8-2.2;
the mass ratio of the biochar to the ceramsite is 0.8-1.2:50;
the mass ratio of the adhesive to the ceramsite is 0.8-1.2:20.
5. The method for preparing the biochar scrap iron coupling filler according to claim 1, wherein the particle size of the modified biochar is less than or equal to 18 meshes; the particle size of the ceramsite is 10-20 nm.
6. The method for preparing the biochar scrap iron coupling filler according to claim 1, wherein the standing time of the step (3) is 22-26 hours.
7. The biochar scrap iron coupling filler prepared by the preparation method of any one of claims 1 to 6.
8. Use of the biochar scrap iron coupling filler according to claim 7 for removing nitrate.
9. The use of the biochar scrap iron coupling packing according to claim 8, wherein the biochar scrap iron coupling packing is used for a denitrification reaction column.
10. The application of the biochar scrap iron coupling filler according to claim 9, wherein the bottom of the denitrification reaction column is melon seed pieces, and the upper part is the biochar scrap iron coupling filler; the volume ratio of the melon seed slices to the biochar scrap iron coupling filler is 1:1.8-2.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310117142.5A CN116332340A (en) | 2023-02-14 | 2023-02-14 | Biochar scrap iron coupling filler and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310117142.5A CN116332340A (en) | 2023-02-14 | 2023-02-14 | Biochar scrap iron coupling filler and preparation method and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116332340A true CN116332340A (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310117142.5A Pending CN116332340A (en) | 2023-02-14 | 2023-02-14 | Biochar scrap iron coupling filler and preparation method and application thereof |
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| Country | Link |
|---|---|
| CN (1) | CN116332340A (en) |
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2023
- 2023-02-14 CN CN202310117142.5A patent/CN116332340A/en active Pending
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