KR101768703B1 - ZERO-VALENT IRON COATING SAND MEDIA and GREEN INFRASTRUCTURE USING THE SAME - Google Patents
ZERO-VALENT IRON COATING SAND MEDIA and GREEN INFRASTRUCTURE USING THE SAME Download PDFInfo
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- KR101768703B1 KR101768703B1 KR1020160024704A KR20160024704A KR101768703B1 KR 101768703 B1 KR101768703 B1 KR 101768703B1 KR 1020160024704 A KR1020160024704 A KR 1020160024704A KR 20160024704 A KR20160024704 A KR 20160024704A KR 101768703 B1 KR101768703 B1 KR 101768703B1
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- South Korea
- Prior art keywords
- zero
- valent iron
- iron particles
- photocatalyst
- sand
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000004576 sand Substances 0.000 title claims abstract description 32
- 239000011248 coating agent Substances 0.000 title description 11
- 238000000576 coating method Methods 0.000 title description 11
- 239000002245 particle Substances 0.000 claims abstract description 43
- 229910052742 iron Inorganic materials 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 28
- 229920000642 polymer Polymers 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 27
- 239000012153 distilled water Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 19
- 239000003344 environmental pollutant Substances 0.000 claims description 16
- 231100000719 pollutant Toxicity 0.000 claims description 16
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical group O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 claims description 13
- 229940072056 alginate Drugs 0.000 claims description 13
- 235000010443 alginic acid Nutrition 0.000 claims description 13
- 229920000615 alginic acid Polymers 0.000 claims description 13
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000005913 Maltodextrin Substances 0.000 claims description 4
- 229920002774 Maltodextrin Polymers 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 4
- UORVGPXVDQYIDP-UHFFFAOYSA-N borane Chemical compound B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010277 boron hydride Inorganic materials 0.000 claims description 4
- 229940035034 maltodextrin Drugs 0.000 claims description 4
- 239000001814 pectin Substances 0.000 claims description 4
- 229920001277 pectin Polymers 0.000 claims description 4
- 235000010987 pectin Nutrition 0.000 claims description 4
- 239000002243 precursor Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000000661 sodium alginate Substances 0.000 claims description 4
- 235000010413 sodium alginate Nutrition 0.000 claims description 4
- 229940005550 sodium alginate Drugs 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 4
- 239000011343 solid material Substances 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 239000012279 sodium borohydride Substances 0.000 claims description 3
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims 2
- 239000011941 photocatalyst Substances 0.000 abstract description 91
- 239000002689 soil Substances 0.000 abstract description 16
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 13
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 9
- 238000011109 contamination Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 71
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 62
- 239000002105 nanoparticle Substances 0.000 description 50
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 48
- 229910021536 Zeolite Inorganic materials 0.000 description 47
- 239000010457 zeolite Substances 0.000 description 47
- 239000002344 surface layer Substances 0.000 description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 23
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 22
- 239000002131 composite material Substances 0.000 description 16
- 239000007864 aqueous solution Substances 0.000 description 12
- 230000001699 photocatalysis Effects 0.000 description 12
- 229910010413 TiO 2 Inorganic materials 0.000 description 10
- 239000002114 nanocomposite Substances 0.000 description 10
- 238000001764 infiltration Methods 0.000 description 9
- 230000008595 infiltration Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 229910001385 heavy metal Inorganic materials 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 229910052911 sodium silicate Inorganic materials 0.000 description 7
- 239000004115 Sodium Silicate Substances 0.000 description 6
- 238000001354 calcination Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000003673 groundwater Substances 0.000 description 6
- 239000005416 organic matter Substances 0.000 description 6
- 230000035515 penetration Effects 0.000 description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 239000012855 volatile organic compound Substances 0.000 description 5
- 239000000809 air pollutant Substances 0.000 description 4
- 231100001243 air pollutant Toxicity 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- -1 Fe (III) iron salt Chemical class 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 231100000647 material safety data sheet Toxicity 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002362 mulch Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 1
- 229910002915 BiVO4 Inorganic materials 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 229910005540 GaP Inorganic materials 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 229910010082 LiAlH Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 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 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 238000003915 air pollution Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- NTJHUEGHVSASEP-UHFFFAOYSA-N borane Chemical compound B.B NTJHUEGHVSASEP-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- UHYPYGJEEGLRJD-UHFFFAOYSA-N cadmium(2+);selenium(2-) Chemical compound [Se-2].[Cd+2] UHYPYGJEEGLRJD-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- 239000012280 lithium aluminium hydride Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007539 photo-oxidation reaction Methods 0.000 description 1
- 238000007540 photo-reduction reaction Methods 0.000 description 1
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- 230000029553 photosynthesis Effects 0.000 description 1
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- 229910052697 platinum Inorganic materials 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B01J35/004—
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
- E03F1/002—Methods, systems, or installations for draining-off sewage or storm water with disposal into the ground, e.g. via dry wells
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
- E03F5/101—Dedicated additional structures, interposed or parallel to the sewer system
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2221/00—Applications of separation devices
- B01D2221/12—Separation devices for treating rain or storm water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
-
- 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
- C02F2103/001—Runoff or storm water
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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
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Health & Medical Sciences (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Public Health (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
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Abstract
Description
The present invention relates to the media of urban green infrastructure such as rain gardens and filter strips, and more particularly to providing a structure comprising zero valence iron in the intermediate media of the green infrastructure .
The present invention provides a sand filter material layer coated with Young's modulus nano iron or a mixed media material layer in which zero-valent iron particles coated with a polymer are mixed with sand and the like, , And a technique for reducing and removing harmful organic substances such as TCE.
In recent years, the development of low impacts for the recovery of water circulation and reduction of urban environmental pollution through the reduction of non-point pollution and rainfall runoff in urban areas, or the application of urban green infrastructure technology has been increasing day by day.
Typical urban green infrastructure facilities, such as lane gardens, filter strips, grass swales, man-made wetlands, or rooftop greening facilities, remove rainwater runoff and associated pollutants from the impervious surface of urban areas by filtration and penetration, The focus is on recovering the water cycle health of the city. Therefore, in order to utilize the filtration mechanism, various types of artificial soil or filter media are generally used.
It is also known that the urban green infrastructure facility can also absorb pollutants from the soil layer or the media layer through vegetation, and also can purify urban air through photosynthesis of vegetation. However, these green infrastructures mainly focus on the restoration of the water circulation soundness to reduce the surface runoff and the groundwater content by penetrating the rainfall runoff into the soil layer smoothly. The removal of pollutants is a secondary function and the efficiency is also limited .
This development technology relates to the development of a photocatalyst-coated zeolite filter material applicable as a filter medium used in the above-mentioned green infrastructure facility. The present invention reduces the amount of air pollutants such as NOx and VOC by applying ultraviolet-sensitive photocatalyst (TiO2) or visible light-sensitive composite photocatalyst (WO3 / TiO2) on the surface of zeolite and applying it to the surface layer, (Organic matter, heavy metal) can be removed by adsorption, photo-oxidation or ion exchange.
Photocatalyst (photocatalyst) is a substance that promotes photochemical reaction. Typically, the action and effect of titanium oxide are helping to solve environmental problems. However, since the tin oxide is reacted in the ultraviolet region, there is a limit to apply to the natural green city infrastructure of the present invention. That is, the facility or apparatus type can utilize an ultraviolet artificial light source relatively well, but in a facility such as a natural rain garden, an ultraviolet ray region including about 4% of the sunlight should be utilized, It is necessary to secure a wide range. Therefore, the present invention is to provide a nanocomposite photocatalyst which is stable in the filter medium and has excellent catalytic activity even in visible light when a photocatalyst is applied to a natural urban green infrastructure (for example, a rain garden). The present invention provides a method for producing a nanocomposite photocatalyst having such properties. Thereby increasing the solar light source response efficiency.
In addition, the present invention relates to a filter medium structure used in the above-mentioned green infrastructure, wherein a zeolite layer coated with a photocatalyst is provided on the surface layer of the green infrastructure, a sand filter layer coated on the lower layer of the soil for vegetation, The lowest part is the structure of multi-media layer structure composed of gravel layer and its design method. Zero-gaseous nano-iron has generally been proposed for use in the form of permeable reaction walls for soil oil contamination and nitric acid removal.
The depth of the zeolite layer coated with the photocatalyst in the arrangement of the multi-media layer should take into consideration the penetration depth of sunlight (ultraviolet ray, etc.). The penetration depth of sunlight is limited, so that the depth is deepened, and the efficiency of the photocatalyst-coated zeolite layer is not improved. However, if the surface layer is shallow, it is difficult to maintain the zeolite layer coated with the photocatalyst. For this reason, when the surface layer, which should be uniformly installed, is lost due to natural environment such as wind or rainfall and its lower layer is exposed, the effect of the action of the non-point pollutant treatment and air pollutant treatment of the present invention is reduced. The present invention attempts to secure economical efficiency in consideration of the thickness of the surface layer.
As a prior art related to non-point pollution using zero valence iron, Korean Patent Registration No. 10-0451017 discloses a method for purifying river water, which is characterized in that the filtered water passing through the alluvial aquifer in the river bed and the river bed is collected But it has some in common with the present invention in that it uses activated carbon or zero iron. However, the present invention is different from the prior art in that it provides a sand filter material layer coated with Young's modulus nano iron or a mixed media material layer in which zero-valent iron particles coated with a polymer are mixed with sand.
[0001] The present invention relates to a water treatment apparatus and a water treatment method using zero valence iron, wherein zero valence iron capable of removing various pollutants including nitrate nitrogen is attached to a magnet and fixed in the water to be treated, There is some similarity with the present invention in that it proposes a water treatment apparatus and a water treatment method which are superior in water treatment efficiency and prevent loss. However, the present invention differs in the point that it is a technology applied to a natural-type green infrastructure such as a lane garden, and the configuration is also different.
A method for treating landfill and abandoned mine leachate using multifunctional permeable reaction walls is disclosed in US Pat. No. 5,325,128, which is a multi-layered structure comprising a reaction front wall consisting of mixture of zero valent steel and steel slag, and a rear end reaction wall comprising microbial treated waste tire The present invention relates to a technique for reducing pollutants by a method such as filtration, adsorption and chemical reaction, and the prior art relates to a technique for treating leachate by blocking leachate There is a difference in that it is a technique to be used.
The object of the present invention is to apply a photocatalyst to a surface of a facility by coating the surface of the zeolite with a photocatalyst so as to be able to effectively control contaminants in the atmosphere and water by applying it to an urban green infrastructure facility, do.
The present invention is characterized in that a zeolite layer coated with the above-described photocatalyst is provided instead of a mulch generally used for the surface of a rain garden, and a sand filter material layer containing zero-valent nano iron is installed below the soil layer of the rain garden (VOCs, Volatile Organic Compounds, Volatile Organic Compounds) such as nitrogen oxides (NOx) in the atmosphere by improving the efficiency of reducing organic matters and heavy metals in rainwater runoffs. The present invention is to provide a technology that can be applied to natural urban green infrastructures such as lane gardens and filter strips.
In order to increase the efficacy of the photocatalyst-coated zeolite layer applied to the surface layer of a natural-type urban green infrastructure such as the lane garden, the present invention can be applied not only in the ultraviolet region but also in a visible light region in a natural state, Thereby providing a photocatalyst that minimizes light scattering.
The present invention discloses a structure in which a filter material including a photocatalyst and a filter material layer including a zero-valent nano iron are combined, and the structure is easy to maintain.
According to an aspect of the present invention, there is provided a green infra that reduces non-point pollutants, wherein at least two of the at least two of the at least one of the at least two of the at least one of the at least two And a green infrastructure.
Among the two or more of the two or more filter media, the surface layer may include a photocatalyst capable of not only reducing non-point pollutants but also treating nitrogen oxides in the air.
The surface layer may be a zeolite layer coated with photocatalyst nanoparticles, and a soil layer capable of vegetation may be formed under the zeolite layer.
The media layer containing zero valence iron may be a sand filter media layer coated with zero-valent nano-iron or a mixed media material layer in which zero valent iron particles coated with a polymer are mixed with sand.
The sand layer coated with Young's Modulus Nano-Fe is prepared by mixing a proper amount of iron ion distilled water, which is a precursor of sand and zero valence iron, in an appropriate ratio, adding KBH4 or NaBH4 to the mixed solution prepared in the mixing step, , A step of drying the recovered solid material in a vacuum drying process, a drying storage step of storing the recovered solid material in an anaerobic condition, and a step of constructing a green infrastructure by installing the solid material .
The pH of the mixing step is 4, and the drying and drying step is performed by vacuum drying at 90 degrees Celsius for 2 to 3 hours.
The zero-valent iron particles are centrifuged after cleaning the zero-valent iron particles and washed with distilled water to remove the salt (NaCl or KCl) and the remaining boron hydride boron hydride, and encapsulating the zero valent iron particles with a porous polymer matrix on the surface thereof, followed by mixing the encapsulated zero valent iron particles with the sand.
Wherein the porous polymer matrix is alginate and sodium alginate is prepared and dissolved in distilled water to prepare an alginate solution; adding calcium chloride (CaCl 2) to a calcium chloride solution dissolved in distilled water to prepare maltodextrin, starch, Or pectin to increase the viscosity; pouring the nitrogen gas (N2) while keeping the calcium chloride solution and the zero-valent iron particles in the alginate solution to maintain the anaerobic condition at all times; And recovering the resulting encapsulated zero valent iron particles.
The green infrastructure may be a lane garden, a filter strip, or a flower bed.
In order to solve the above-described problems, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing a green infra- It provides a distinctive material layer.
The present invention also provides a green infrastructure including a wetland, a lane garden, and a penetration ditch, wherein the roof infrastructure has a photocatalytic surface layered filter media zone, a loop drain is formed outside the barrier plate surrounding the photocatalytic surface layer media zone, And a perforated pipe connected to the outside is buried under the surface layer so that the photocatalytic surface layer filter material is not lost.
According to the present invention, the urban green infrastructure facility, which is focused on the recovery of water circulation in the past, enables effective control of pollutants in the atmosphere and in the water.
When a nanocomposite photocatalyst in which guest nanoparticles effectively absorbing visible light according to the manufacturing method proposed by the present invention is uniformly dispersed in host nanoparticles having a relatively large band gap energy is applied to the zeolite layer, Since the catalyst activity is excellent and the stability is excellent, the efficacy of the natural-type urban green infrastructure of the present invention is excellent, in particular, the daily air pollutant reduction effect without raining.
The present invention has a combination of a filter material including a photocatalyst and a filtering material layer containing zero-valent nano iron, and has an effect of easy maintenance.
1 and 2 show the results of performing nitrogen oxide (NOx) removal experiments in air using the zeolite filter material coated with the photocatalyst nanoparticles of the present invention.
FIG. 3 is a graph showing the results of performing a nitrogen oxide (NOx) removal experiment after coating
4 is a conceptual view of a cross section of a lane garden as an embodiment to which the present invention is applied.
FIG. 5 is a view illustrating a parking lot flower bed as another embodiment of the present invention.
6 to 10 are views showing a composite green infrastructure to which the present invention is applied. 6 is a top view of a composite green infrastructure to which the present invention is applied.
FIGS. 7 and 8 show the first embodiment of the cross section AA 'of FIG. 6, and FIG. 8 is an enlarged view of a part of FIG.
Figs. 9 and 10 show a second embodiment of the AA 'cross section of Fig. 6, and Fig. 10 is an enlarged view of a portion of Fig.
Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not to be construed as limiting the invention to the precise form disclosed. It is provided to let you know.
[Photocatalyst-coated zeolite]
The present invention is characterized in that a zeolite layer coated with a photocatalyst instead of a mulch generally used on the surface of a green infrastructure such as a lane garden is provided and a sand filter media layer coated with zero- It is a technology that improves the efficiency of organic matter and heavy metal reduction in rainfall runoff and treats VOC materials such as nitrogen oxide (NOx) in the atmosphere. It is not only a rain garden, but also a filter strip and a tree box It is a technology applicable to urban green infrastructure.
As a first embodiment of the present invention, the process for producing the photocatalyst-coated zeolite of the present invention is as follows.
Calcination step: A zeolite filter medium is prepared and placed in a crucible and heated at 600 ° C. for 2 hours in a furnace to volatilize the organic substances present in the zeolite and cool at room temperature.
Mixing zeolite and photocatalyst nanoparticles: After the calcination step, distilled water and photocatalyst particles are placed in the crucible containing the zeolite and mixed thoroughly with a magnetic stir bar or the like.
It is preferable that 100 g of zeolite and 20 g of photocatalyst particles are mixed per 100 g of the distilled water to prepare a 20% coated zeolite.
Add 100 mL of photocatalyst particles (TiO2 or composite photocatalyst, WO3 / TiO2) to 100 mL of distilled water in a crucible containing the prepared zeolite, and mix thoroughly with a magnetic stir bar or the like. To prepare a zeolite coated with a photocatalyst weight ratio of 20%, 20 g of photocatalyst particles (
Drying the mixture: The crucible containing the mixed solution prepared in the mixing step of the zeolite and the photocatalyst nanoparticles is placed in a dry oven and dried at 105 ° C for 12 hours to remove moisture.
Sintering Sintering step: The moisture-removed sintered mixture is heated in a furnace at about 600 ° C. for about 2 hours, so that the photocatalyst nanoparticles are tightly adhered to each other due to particle-to-particle aggregation at the surface of the zeolite So that it is solidified. Experiments show that heating for more than 2 hours did not provide a better effect for sintering the mixture.
Sintering of the photocatalyst nanoparticles occurs at a temperature higher than 600 ° C. Thereby causing entanglement between particles on the surface of the zeolite to coat the photocatalyst nanoparticles on the zeolite.
[Nanocomposite photocatalyst]
As a more specific embodiment of the present invention, the photocatalyst may be a nanocomposite photocatalyst. The nanocomposite photocatalyst is formed by a method of preparing a nanocomposite photocatalyst of a host nanoparticle and a guest nanoparticle, comprising: modifying the surface of the host nanoparticle with a basic aqueous solution; Mixing an aqueous solution containing the surface-modified host nanoparticles with an aqueous solution containing the guest nanoparticle precursor to form a complex; And a step of drying and calcining the formed complex.
The host nanoparticles may be at least one selected from the group consisting of
The basic aqueous solution used to modify the surface of the host nanoparticles may be NaOH having a concentration of 1M to 2M. Use of a basic aqueous solution within the above concentration range can improve bonding with guest nanoparticles without impairing desired physical properties of the host nanoparticles. The basic aqueous solution changes the surface by etching the crystal surface of the host nanoparticles to form an opening through which the guest nanoparticles can be adhered. Through such surface etching, it is possible to induce a strong coordination bond between the host nanoparticles and the guest nanoparticles, thereby improving the electron transfer efficiency of the host nanoparticles and the guest nanoparticles. As the bonding force between the host nanoparticles and the guest nanoparticles increases, the performance of the photocatalyst can be improved by reducing the phenomenon that the host nanoparticles oxidize the guest nanoparticles.
The step of modifying the surface of the nanoparticles may include slow stirring using a magnetic stir bar, for example, stirring for 2 to 3 hours. Within the above range, a desired degree of surface etching can be obtained.
The host nanoparticles may be added in an amount of 1 to 50 parts by weight based on 100 parts by weight of the host nanoparticles. The step of forming the complex may include stirring the two aqueous solutions for 1 hour to 2 hours. The step of drying the formed complex may be performed at a temperature of 90 to 105 degrees Celsius and may be performed for 20 to 24 hours. The thus-dried complex can be crystallized through the calcination step. The calcination step may be performed at a temperature of 300 to 400 degrees Celsius and may be performed for 4 to 6 hours. When performed within the above range, the nanocomposite photocatalyst can be efficiently produced, and the size of the produced nanoparticles can be made smaller. If the drying and calcination steps are carried out in this temperature range, the time taken to dry and calcine can be shortened.
The photocatalytic activity of WO3-TiO2 photocatalyst particles and WO3-BiVO4 photocatalyst particles, which are specific examples of the present invention, are sensitive to visible light and have a sufficient photocatalytic activity to have a heavy metal removal effect. The nanocomposite photocatalyst prepared by the method provided by the present invention can be sensitized not only in the UV region but also in the visible light region, and also has excellent photocatalytic activity through uniform nano-sized particles.
As a result, the nanocomposite photocatalyst produced by the method of the present invention can be effectively applied to the removal of heavy metals or harmful organic substances contained in the atmosphere or water, It is possible to efficiently remove air pollutants and water pollutants.
Experiments were carried out to confirm the removal efficiency of nitrogen oxide in the zeolite media coated with photocatalyst nanoparticles. 1 and 2 show the results of performing nitrogen oxide (NOx) removal experiments in air using the zeolite filter material coated with the photocatalyst nanoparticles of the present invention. More specifically, FIG. 1 compares the NOx removal efficiency of TiO2 particles and TiO2-coated zeolite (TCZ), FIG. 2 shows the NOx removal efficiency of zeolite (CCZ) coated with WO3 / TiO2 composite photocatalyst particles and a composite photocatalyst Respectively.
As shown in FIGS. 1 and 2, the photocatalyst nanoparticle-coated zeolite according to the present invention exhibits higher nitrogen oxide (NOx) removal efficiency than when the photocatalyst (
[Pitcher block coated with photocatalyst nanoparticles]
The zeolite coated with the photocatalyst nanoparticles described above can achieve the desired object of the present invention, but the surface layer may be formed as a permeable block according to a green infrastructure (for example, a parking lot package that can be subjected to non-point pollution treatment) . In this case, the surface of the permeable block may be coated by the following method.
Preparation of aqueous solution of sodium silicate: Sodium silicate aqueous solution is prepared by mixing 100 g of sodium silicate in 100 ml of distilled water and heating to 80-90 캜. (The temperature conditions of the aqueous solution and the concentration of sodium silicate are based on the solubility of sodium silicate Na2SiO3 in the Material Safety Data Sheet (MSDS) provided by the manufacturer)
Preparation of Coating Solution: Prepare photocatalyst coating solution by mixing aqueous solution of photocatalyst particles (TiO2 or WO3 / TiO2 composite photocatalyst) and aqueous solution of sodium silicate.
Coating Step: Put the prepared mixed solution into the air spray gun and spray evenly on the surface of the permeable block. Compressors were used for spraying with air spray guns, and the pressure in this example was about 0.4 MPa. The pressure is an empirical value for smoothly injecting the particles in the mixed solution upon spraying with the spray.
Drying step: Put the coated pellet block into the oven and dry for about 12 hours at around 70 ° C. This results in a water-permeable block coated with the photocatalyst nanoparticles.
FIG. 3 is a graph showing the results of performing a nitrogen oxide (NOx) removal experiment after coating
[Structure of media layer containing zero valence iron]
According to the present invention, a zeolite layer coated with photocatalyst nanoparticles on the surface of a green infrastructure is installed as described above. 4 is a conceptual view of a cross section of a lane garden as an embodiment to which the present invention is applied.
It can be seen that the
One of the main techniques of the present invention is to apply photocatalyst nanoparticles, which have been widely used for building self-cleaning and air pollution reduction purposes, on a building exterior to a zeolite as a water treatment material and apply it to urban green infrastructures such as lane gardens, And air quality at the same time.
By the way, NOx in the atmosphere is converted into nitric acid by photocatalyst, and the converted nitric acid is dissolved in water and penetrates into the ground during rainfall, which can act as a new pollutant. If there is no further denitrification treatment, groundwater contamination is a concern. Nitric acid is a major groundwater pollutant. Therefore, in the present invention, a dense material layer containing zero valence iron is disposed under the zeolite layer coated with the photocatalyst to achieve denitrification.
The filtering layer containing zero valence iron according to the present invention is further characterized by reducing and removing harmful organic substances such as oil substances and TCE, which are frequently generated in urban areas.
The
Specifically, the
The sandy media layer coated with Young's modulus nano iron can be implemented by the following method.
Mixing step: Appropriate mixing of iron ion distilled water, which is a precursor of sand and zero valent iron, at an appropriate ratio. It is preferable that the above mixing is strongly mixed so that there is no entanglement or precipitation of iron salts. Ultrasoftization can be used or acidic (around pH 4) can be adjusted to prevent flocculation or sedimentation as needed.
Solid Recovery Step: Add KBH4 or NaBH4 to the prepared mixture, mix and recover the resulting black solid. Through this process, the ferrous iron is reduced to zero valence iron.
Dry storage step: The recovered solids are stored under anaerobic conditions after vacuum drying (90 degrees, 2-3 hours). Since ferrous iron can oxidize under aerobic conditions, it is desirable to maintain anaerobic conditions during storage.
Formation of the media layer: When the infra-structure of the green nano-iron coated sand is prepared, it is installed as a filter media to form a sand filter media coated with Young's modulus nano iron.
In addition to the above-mentioned method of coating the zero valence iron nanoparticles on the sand, a filter medium containing zero valence iron may be formed by mixing the zero valent iron particles coated on the surface of the polymer with the sand by the polymer produced by the following method.
(ZVI) particle generation step: After a proper amount of Fe (II) or Fe (III) iron salt (
2Fe2 + + BH4- + 3H2O - > 2Fe0 + H2BO3- + 4H + + 2H2
Separation of zero valent iron: The generated black Fe0 particles are centrifuged and washed with distilled water to remove salt (such as NaCl or KCl) and residual boron hydride. The precipitate is separated from the solution, dried in a vacuum oven and stored under anaerobic conditions
Zero-valent iron encapsulation: Encapsulation of zero valent iron particles on a porous polymer matrix (alginate, agar, ethyl cellulose, polyvinyl alcohol, silica gel, etc.) prevents zero oxidation, It is possible to increase the life expectancy of the apparatus.
Mixed media forming step: Encapsulated zero valent iron beads are mixed with sand to form a mixed media layer. When the mixed media is formed by applying the mixed media, the pollutants in the water passing through the mixed media are diffused through the pores of the porous polymer to zero valence iron (in the case of nitrate (NO 3 -) or TCE).
In the encapsulation process, alginate is applied to the porous polymer matrix as follows.
Step 1: Sodium alginate is prepared and dissolved in distilled water to prepare an alginate solution.
Step 2: Dissolve calcium chloride (CaCl2) in distilled water to prepare a calcium chloride solution. Add an appropriate amount of maltodextrin, starch, or pectin to the prepared solution to increase the viscosity.
Step 3: While the above-mentioned calcium chloride solution and zero valence iron are gradually introduced into the above-mentioned alginate solution, nitrogen gas (N2) is purged to maintain anaerobic conditions at all times.
Step 4: Recover the finally generated encapsulated zero valence iron.
[Action of the present invention]
The operation of the present invention will be described. The present invention basically reduces pollutants, and not only removes organic matter and heavy metals in rain water runoff, but also reduces nitrogen oxides in the atmosphere as in the conventional natural type nonpoint pollution abatement facility.
Organic matter (rainwater, COD, BOD) in rainfall runoff
- The organic matter contained in the runoff effluent is adsorbed on the photocatalyst coated zeolite filter located on the surface layer of the rain garden, and finally oxidized and decomposed through photoreaction.
- Organic matter that has not been removed by adsorption on the surface layer is adsorbed and decomposed on subsequent soil layer and sand filter media (biochemical and chemical decomposition).
Heavy metals in runoff runoff
- Heavy metals in the water are removed by adsorption and photoreduction in the surface zeolite layer, or are removed by the ion exchange mechanism of the zeolite.
- Subsequent removal by adsorption / vegetation absorption in the soil layer.
Atmospheric nitrogen oxides
- During non-precipitation, the gaseous nitrogen oxides in the atmosphere are oxidized by the photocatalyst coated on the zeolite and converted into NO3- (nitric acid). Converted nitric acid is expected to be a trace amount of biochemical denitrification in subsequent soil layers. The following shows the process in which NOx is converted into nitric acid by the photocatalyst.
- Nitric acid, which is good in mobility in the soil, reaches the filter media containing zero valence iron and is chemically denitrified. The denitrification equation of nitric acid by the zero valent nano iron is as follows.
In particular, NOx in the atmosphere is converted into nitric acid by photocatalyst, and the converted nitric acid is dissolved in water and penetrates into the groundwater during rainfall. If there is no further denitrification treatment, groundwater contamination is concerned (nitric acid is a major groundwater pollutant). Therefore, the present invention aims at denitrification by installing a sand filter material containing zero valence iron as a lower layer in the lower part, and additionally reducing and removing harmful organic substances such as oil and TCE, which are frequently generated in urban areas.
[Other Embodiments of the Present Invention]
The foregoing description of the present invention has been presented for illustrative purposes only for the lane garden. However, the technical idea of the present invention is not limited thereto.
For example, the present invention can be applied to a flower bed of a parking lot. FIG. 5 is a view illustrating a parking lot flower bed as another embodiment of the present invention.
Meanwhile, a complex green infrastructure to which the present invention is applied is presented. The reason for the so-called 'complex' is not only the rain gardens, but also the combination of wetlands and infiltration ditches as initial settlement sites. As described above, the technical idea of the present invention may be applied to the lane garden of the composite green infrastructure of the present invention. In the present embodiment and the following embodiments, the technical idea of the present invention is applied to the infiltration ditch. Of course, such an application does not limit the application of the technical idea of the present invention, but can be applied selectively.
6 to 10 are views showing a composite green infrastructure to which the present invention is applied. 6 is a top view of a composite green infrastructure to which the present invention is applied. Figs. 7 and 8 show the first embodiment of the cross section taken along line A-A 'of Fig. 6, and Fig. 8 is an enlarged view of a portion of Fig.
The composite
The space in which the complex green infrastructure can be installed varies. If there is a need to reduce non-point pollutants caused by impervious surfaces, a complex green infrastructure can be applied. Rainfall runoff from infiltrating roads, parking lots, or roofs enters the complex green infrastructure.
The rainfall runoff flows into the
The rainwater effluent flowing into the
The rainfall runoff via the lane garden (60) is finally introduced into the infiltration ditch (70). On the other hand, the inflow into the
On the other hand, a
For this, an embodiment of the present invention forms an
Considering the climatic characteristic in which rainfall is concentrated, rapid rainfall runoff can be limited only by the
Figs. 9 and 10 show a second embodiment of the cross section taken along line A-A 'of Fig. 6, and Fig. 10 is an enlarged view of a portion of Fig. The present embodiment is configured to treat only the rainfall falling from the top to the bottom of the photocatalyst surface layer at the time of the heavy rain as described above, and to rapidly discharge the rainwater inflow water flowing from the impervious layer at the side to the separate piping.
The
The height of the loop drain is formed to be lower than the partition wall between the lane garden and the infiltration ditch. Through which rainwater flowing out of the rain gard through the weir quickly flows through the loop drain and the pore pipe. As a result, the filter material layer including the photocatalyst formed in the infiltration trench can be stably maintained.
According to one aspect of the present invention, there is provided a photocatalytic surface layer filter medium comprising a photocatalytic surface layer comprising a photocatalytic filter layer as a surface layer, wherein a loop drain is formed outside the partition wall surrounding the photocatalytic surface layer filtering medium zone, And the photocatalyst surface layer filter material is not lost.
Although the present invention has been described with reference to specific embodiments as described above, the present invention is not limited thereto. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.
1: Lane Garden
2: Parking lottery
3: Compound Green Infrastructure
10: zeolite layer coated with photocatalyst nanoparticles
20: Filter layer containing zero valence iron
30: soil layer
31: Vegetation
40: Gravel drainage layer
50: Wetlands
51: Aquatic plants
52: Weir
60: Lane Garden
61: Vegetation
62: Loop drain
70: penetration ditch
71: Filter layer containing a photocatalyst
72: Inflow ball
73: Pipe
Claims (11)
The mixed media layer in which the zero valent iron particles coated with the polymer are mixed together with the sand,
After forming the zero valent iron particles, the zero valent iron particles are centrifuged and washed with distilled water to remove the salt (such as NaCl or KCl) and the remaining boron hydride, and the step of encapsulating the zero valent iron particles with a porous polymer matrix Wherein the porous polymer matrix is formed by mixing the encapsulated zero valent iron particles with sand, wherein the porous polymer matrix is alginate,
Preparing sodium alginate by dissolving it in distilled water to prepare an alginate solution, adding at least one of maltodextrin, starch, and pectin to a calcium chloride solution in which calcium chloride (CaCl2) is dissolved in distilled water Maintaining the anaerobic condition by purging the nitrogen gas (N2) while adding the calcium chloride solution and the zero-valent iron particles to the alginate solution, and recovering the resulting encapsulated zero valent iron particles And is characterized in that
Green infrastructure.
A mixing step of mixing iron and distilled water, which is a precursor of sand and zero valence iron,
A solid recovery step of adding KBH4 or NaBH4 to the mixed solution prepared in the mixing step to recover the black solid produced,
A drying storage step of storing the recovered solids in an anaerobic condition after vacuum drying; and
And constructing a green infrastructure by installing the solid material.
Green infrastructure.
Characterized in that the pH of the mixing step is 4 and the drying storage step is vacuum drying at 90 ° C for 2 to 3 hours
Green infrastructure.
Characterized in that the green infrastructure is a lane garden, filter strip or flower bed
Green infrastructure.
After forming the zero valent iron particles, the zero valent iron particles are centrifuged and washed with distilled water to remove the salt (such as NaCl or KCl) and the remaining boron hydride, and the step of encapsulating the zero valent iron particles with a porous polymer matrix Wherein the porous polymer matrix is formed by mixing the encapsulated zero valent iron particles with sand, wherein the porous polymer matrix is alginate,
Preparing sodium alginate by dissolving it in distilled water to prepare an alginate solution, adding at least one of maltodextrin, starch, and pectin to a calcium chloride solution in which calcium chloride (CaCl2) is dissolved in distilled water Maintaining the anaerobic condition by purging the nitrogen gas (N2) while adding the calcium chloride solution and the zero-valent iron particles to the alginate solution, and recovering the resulting encapsulated zero valent iron particles And is characterized in that
Mixed media layer.
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| US10919784B2 (en) | 2018-08-17 | 2021-02-16 | Badwater Alchemy Holdings LLC | Iron-based desalination |
| KR102234793B1 (en) * | 2019-10-03 | 2021-04-01 | 주식회사 부강산업 | Manhole having Pollutant and Calcium Chloride Removing Function by using Collecting Layer |
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