CN103880107A - Double-layer permeable reactive barrier system for repairing chromium-polluted underground water - Google Patents
Double-layer permeable reactive barrier system for repairing chromium-polluted underground water Download PDFInfo
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- CN103880107A CN103880107A CN201410088161.0A CN201410088161A CN103880107A CN 103880107 A CN103880107 A CN 103880107A CN 201410088161 A CN201410088161 A CN 201410088161A CN 103880107 A CN103880107 A CN 103880107A
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- reduction reaction
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 230000004888 barrier function Effects 0.000 title claims abstract description 40
- 238000006722 reduction reaction Methods 0.000 claims abstract description 82
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 28
- 239000011651 chromium Substances 0.000 claims abstract description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000002028 Biomass Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000001179 sorption measurement Methods 0.000 claims abstract description 15
- 230000009467 reduction Effects 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 5
- 239000010902 straw Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 61
- 238000010521 absorption reaction Methods 0.000 claims description 57
- 229910052902 vermiculite Inorganic materials 0.000 claims description 29
- 235000019354 vermiculite Nutrition 0.000 claims description 29
- 239000010455 vermiculite Substances 0.000 claims description 29
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 16
- 239000003469 silicate cement Substances 0.000 claims description 16
- 239000002250 absorbent Substances 0.000 claims description 15
- 230000002745 absorbent Effects 0.000 claims description 15
- 230000002262 irrigation Effects 0.000 claims description 12
- 238000003973 irrigation Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 208000034189 Sclerosis Diseases 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 8
- 238000013019 agitation Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 239000012798 spherical particle Substances 0.000 claims description 8
- 239000003673 groundwater Substances 0.000 claims description 6
- 238000005342 ion exchange Methods 0.000 claims description 6
- 230000008439 repair process Effects 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 229920001903 high density polyethylene Polymers 0.000 claims description 4
- 239000004700 high-density polyethylene Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 2
- 241001330002 Bambuseae Species 0.000 claims description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 2
- 239000011425 bamboo Substances 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 abstract description 3
- 239000003463 adsorbent Substances 0.000 abstract description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 abstract 3
- 239000003638 chemical reducing agent Substances 0.000 abstract 2
- 230000002829 reductive effect Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a double-layer permeable reactive barrier system for repairing chromium-polluted underground water. The double-layer permeable reactive barrier system comprises a reduction reaction barrier and an adsorption reaction barrier behind the reduction reaction barrier, wherein the space between the reduction reaction barrier and the adsorption reaction barrier is 2.5-5m, the bottom ends of the reduction reaction barrier and the adsorption reaction barrier stretch into an impervious bed by at least 0.60-0.8m, and the tops of the reduction reaction barrier and the adsorption reaction barrier are 0.4-0.5m higher than the maximum water level of the underground water. When the double-layer permeable reactive barrier system is used, the polluted stream sequentially flows through the reduction reaction barrier and the reduction reaction barrier; when flowing through the system, the chromium-polluted underground water firstly flows through the reduction reaction barrier to generate a reduction reaction with zero-valent iron powder to convert hexavalent chromium into trivalent chromium, and organic matters in straw can be taken as electron donors to accelerate the reduction of the hexavalent chromium; a biomass adsorbent has a huge surface area, the residual pollutants can be strongly adsorbed by the adsorption reaction barrier, so that the problems that a reductant is washed away, reduction products are diluted and washed away, the reduction of the hexavalent chromium cannot be realized when the utilization of the reductant is saturated, and the like are solved, and the chromium pollution in the underground water is economically and efficiently removed.
Description
Technical field
The invention belongs to groundwater environment prevention and cure of pollution field, be specifically related to a kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water.
Background technology
The toxicity of chromium is mainly from sexavalent chrome, and it is listed in is to one of eight of harm maximum kinds of chemical substances, is one of internationally recognized three kinds of carcinogenic metal objects, is also one of 129 kinds of generally acknowledged priority pollutants of U.S. EPA simultaneously.
Be subject to the reparation of the underground water of pollution of chromium conventionally to adopt extraction-surface chemistry facture, but exist, cost is high, the cycle long, energy consumption greatly, easily causes the shortcomings such as ground secondary pollution.In recent years, Zero-valent Iron PRB technology is low with its energy consumption, do not cause the advantages such as secondary pollution to rise rapidly, in this process, require to have the existence of excessive reductive agent, therefore in actual use procedure, can there is the problems such as reductive agent is flushed away, reduzate is diluted and washes away, reductive agent use is saturated.
Simultaneously, also can administer by methods such as absorption, chemical precipitation, ion-exchange, filtration, membrane techniquies by the underground water improvement of pollution of chromium, wherein, absorption method can adapt to preferably water quantity and quality and change, simple to operate, cheap, and sorbent material is easy to regeneration, be difficult for causing secondary pollution, thereby application prospect is extensive.
Vermiculite is extensively present in environment, generally there is larger specific surface area, within the scope of common pH, metal ion in water is had to good adsorptive power conventionally, by the chromium pollutant in the effect such as ion-exchange and the complexing Adsorption water of its surface functional group, engineering application is also more extensive.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of this invention is to provide a kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water, realize the economy of pollution of chromium in underground water, efficiently remove.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water, formed by reduction reaction wall and absorption reaction wall, reduction reaction wall is front, absorption reaction wall is rear, spacing between reduction reaction wall and absorption reaction wall is 2.5-5m, the bottom of reduction reaction wall and absorption reaction wall is all deep into watertight layer at least 0.60～0.8m, and top all need be higher than underground water top water-level 0.4～0.5m.
The reaction wall packing material size 1～2cm of described reduction reaction wall, filled media is for having zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate, and four weight percents are 2-5%:15-20%:8-12%:63-75%; The pH value of the mixture of zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate is 8.05 ± 0.25; PERFORMANCE OF MODIFIED VERMICULITE composition weight percent is: SiO
237～42%, Al
2o
39～14%, Fe
2o
35～9%, MgO11～23%, TiO
22～6%, K
2o3～6%, CaO5～33%; PERFORMANCE OF MODIFIED VERMICULITE particle size range is 0.35～1.45mm; Stalk particle particle size range is 0.1～85mm; Silicate is silicate cement (label 325).
The filled media of described absorption reaction wall is biomass sorbing material and silicate, and the two weight percent is 20-35%:65-80%; Biomass absorbent material is shell, bamboo or stalk, and biomass absorbent material granule particle size range is 10～50mm, and silicate is silicate cement (label 325).
Described reduction reaction wall filler preparation method, comprises the following steps:
1) vermiculite that is 0.35～1.45mm by granularity carries out under 75～95 ℃ of conditions with weak acid and weak base solution after 2～4 secondary ion exchanges, washing, be positioned in baking oven and be dried 2.5～3.5 hours under 60 ℃～80 ℃ conditions, pass into the roasting 2.5～3.5 hours under 200 ℃ of conditions of tube furnace of protection gas nitrogen, wherein the blending ratio of vermiculite and weak acid and weak base is volume ratio 1:10-20; Obtain material 1;
2) in material 1, add zeroth order iron powder, straw powder to continue to mix, obtain material 2;
3) gained material 2 is under agitation sprayed to clear water and silicate cement, fully mix, obtain material 3;
4) gained material 3 use Squeezinggranulators are made to 1～2cm spherical particle, obtain material 4;
5) by material 4 Xu's maintenance 24 hours, make its sclerosis for subsequent use;
Zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate, four weight percents are 2-5%:15-20%:8-12%:63-75%.
The preparation method of described absorption reaction wall filler, comprise the following steps: the biomass absorbent material that is 10～50mm by granularity and silicate cement (label 325) under agitation spray clear water, biomass absorbent material and silicate weight percent are 20-35%:65-80%, fully mix, extruder grain is made 1～2cm spherical particle subsequently, maintenance 24 hours again, makes its sclerosis for subsequent use.
The width of described double-deck permeable reactive barrier is 1.3～1.5 times of pollutent plume width.
The dummy system, method of described double-deck permeable reactive barrier comprises the following steps:
1) dig out two irrigation canals and ditches in predetermined position, between two irrigation canals and ditches, leave spacing;
2) bottom of reduction reaction wall and absorption reaction wall is all deep into watertight layer at least 0.60～0.8m, and top all need be higher than underground water top water-level 0.4～0.5m; The width of two walls is got 1.3～1.5 times of pollutent plume width, and wherein the thickness D of reduction reaction wall can be calculated by formula D=vt, and wherein v is average groundwater velocity, and unit is cm/s, adopts Peak Flow Rate value in design; T repairs the required reaction times of pollutent, and pollutent is in the residence time of reaction wall, and unit is s, and the thickness of absorption reaction wall and reduction reaction wall thickness approach;
The requirement of the width of two permeable reactive walls, the degree of depth, thickness more than meeting, makes irony frame, and is arranged in irrigation canals and ditches;
3) all to need to adopt thickness be that 3～5mm high-density polyethylene material is prepared the cubes stuffing box that the length of side is 1m for reduction reaction wall and absorption reaction wall, is wherein respectively covered with perpendicular to two metopes before and after water (flow) direction 64 of the apertures that radius is 1cm;
4) reduction reaction wall and absorption reaction wall sphere-packing particle are separately filled to respectively to corresponding reduction and adsorption stuffing case, reduction and adsorption stuffing case are sequentially put into corresponding reduction reaction wall and absorption reaction within the walls; Reduction reaction wall is front, and absorption reaction wall is rear; Spacing between reduction reaction wall and absorption reaction wall is 2.5-5m.
Double-deck permeable reactive barrier reparation system provided by the invention can be used for repairing the underground water of pollution of chromium, and when use, first contaminated water flow passes through reduction reaction wall, then by absorption reaction wall.When the groundwater flow of pollution of chromium through time, first through reduction reaction wall and zeroth order iron powder generation reduction reaction, can make sexavalent chrome be converted into trivalent chromium.Organic matter in stalk can be used as electron donor, promotes chromic reduction.Absorption reaction wall has huge surface area, strong adsorption residual contamination thing by biomass adsorbent, has solved that reductive agent is flushed away, reduzate is diluted and washes away, reductive agent uses saturated and do not reach the problems such as chromic reduction.
Advantage of the present invention: the double-deck permeable reactive barrier system forming by reduction reaction wall and absorption reaction wall, can realize the economy of pollution of chromium in underground water, efficiently remove.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
A kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water, formed by reduction reaction wall and absorption reaction wall, reduction reaction wall is front, absorption reaction wall is rear, spacing between reduction reaction wall and absorption reaction wall is 3m, the bottom of reduction reaction wall and absorption reaction wall is all deep into watertight layer 0.6m, and top all need be higher than underground water top water-level 0.4m.
The reaction wall packing material size 1cm of described reduction reaction wall, filled media is for having zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate, and four weight percents are 5%:15%:10%:70%; The pH value of the mixture of zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate is 8.15; PERFORMANCE OF MODIFIED VERMICULITE composition weight percent is: SiO
238%, Al
2o
311%, Fe
2o
39%, MgO22%, TiO
26%, K
2o6%, CaO8%, PERFORMANCE OF MODIFIED VERMICULITE particle size range is 0.55～1.45mm; Stalk particle particle diameter is 13～33mm; Silicate is silicate cement (label 325).
The filled media of described absorption reaction wall is biomass sorbing material and silicate, and the two weight percent is 30%:70%; Biomass absorbent material is shell, and biomass absorbent material granule particle diameter is 40～50mm, and silicate is silicate cement (label 325).
Described reduction reaction wall filler preparation method, comprises the following steps:
1) vermiculite that is 1.05～1.35mm by granularity carries out under 80 ℃ of conditions with weak acid and weak base solution after 2 secondary ion exchanges, washing, be positioned in baking oven and be dried 3.5 hours under 80 ℃ of conditions, pass into the roasting 2.5 hours under 200 ℃ of conditions of tube furnace of protection gas nitrogen, wherein the blending ratio of vermiculite and weak acid and weak base is volume ratio 1:11; Obtain material 1;
2) in material 1, add zeroth order iron powder, straw powder to continue to mix, obtain material 2;
3) gained material 2 is under agitation sprayed to clear water and silicate cement, fully mix, obtain material 3;
4) gained material 3 use Squeezinggranulators are made to 1cm spherical particle, obtain material 4;
5) by material 4 Xu's maintenance 24 hours, make its sclerosis for subsequent use;
Zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate, four weight percents are 5%:15%:10%:70%.
The preparation method of described absorption reaction wall filler, comprise the following steps: the biomass absorbent material that is 40～50mm by granularity and silicate cement (label 325) under agitation spray clear water, biomass absorbent material and silicate weight percent are 30%:70%, fully mix, extruder grain is made 1cm spherical particle subsequently, maintenance 24 hours again, makes its sclerosis for subsequent use.
The width of described double-deck permeable reactive barrier is 1.3 times of pollutent plume width.
The dummy system, method of described double-deck permeable reactive barrier comprises the following steps:
1) dig out two irrigation canals and ditches in predetermined position, between two irrigation canals and ditches, leave spacing;
2) bottom of reduction reaction wall and absorption reaction wall is all deep into watertight layer 0.7m, and top all need be higher than underground water top water-level 0.5m; The width of two walls is got 1.3 times of pollutent plume width, and wherein the thickness D of reduction reaction wall can be calculated by formula D=vt, and wherein v is average groundwater velocity, and unit is cm/s, adopts Peak Flow Rate value in design; T repairs the required reaction times of pollutent, and pollutent is in the residence time of reaction wall, and unit is s, and the strong thickness requirement of absorption reaction is not strict, approaches with infiltration reduction reaction wall thickness.
The requirement of the width of two permeable reactive walls, the degree of depth, thickness more than meeting, makes irony frame, and is arranged in irrigation canals and ditches;
3) all to need to adopt thickness be that 5mm high-density polyethylene material is prepared the cubes stuffing box that the length of side is 1m for reduction reaction wall and absorption reaction wall, is wherein respectively covered with perpendicular to two metopes before and after water (flow) direction 64 of the apertures that radius is 1cm;
4) reduction reaction wall and absorption reaction wall sphere-packing particle are separately filled to respectively to corresponding reduction and adsorption stuffing case, reduction and adsorption stuffing case are sequentially put into corresponding reduction reaction wall and absorption reaction within the walls; Reduction reaction wall is front, and absorption reaction wall is rear; Spacing between reduction reaction wall and absorption reaction wall is 3m.
The beneficial effect of this embodiment: by chromium pollutant concentration in the monitor well monitoring underground water that lay double-layer osmotic reaction wall front and back in the venue.Result shows: whole system operation is after 220 days, and chromium pollutant mean concns, by original 143.5mg/L, is reduced to 15.3mg/L, and clearance is 89.4%.
Embodiment 2
A kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water, formed by reduction reaction wall and absorption reaction wall, reduction reaction wall is front, absorption reaction wall is rear, spacing between reduction reaction wall and absorption reaction wall is 4m, the bottom of reduction reaction wall and absorption reaction wall is deep into respectively watertight layer 0.7m, 0.8m, and top is respectively higher than underground water top water-level 0.4m, 0.5m.
The reaction wall packing material size 2cm of described reduction reaction wall, filled media is for having zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate, and four weight percents are 3%:20%:12%:65%; The pH value of the mixture of zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate is 8.05; PERFORMANCE OF MODIFIED VERMICULITE composition weight percent is: SiO
242%, Al
2o
314%, Fe
2o
39%, MgO11%, TiO
22%, K
2o3%, CaO19%, PERFORMANCE OF MODIFIED VERMICULITE particle size range is 0.75～0.95mm; Stalk particle particle diameter is 0.1～66mm; Silicate is silicate cement (label 325).
The filled media of described absorption reaction wall is biomass sorbing material and silicate, and the two weight percent is 35%:65%; Biomass absorbent material is stalk, and biomass absorbent material granule particle diameter is 15～50mm, and silicate is silicate cement (label 325).
Described reduction reaction wall filler preparation method, comprises the following steps:
1) vermiculite that is 0.35～1.15mm by granularity carries out under 95 ℃ of conditions with weak acid and weak base solution after 3 secondary ion exchanges, washing, be positioned in baking oven and be dried 3 hours under 80 ℃ of conditions, pass into the roasting 2.75 hours under 200 ℃ of conditions of tube furnace of protection gas nitrogen, wherein the blending ratio of vermiculite and weak acid and weak base is volume ratio 1:20; Obtain material 1;
2) in material 1, add zeroth order iron powder, straw powder to continue to mix, obtain material 2;
3) gained material 2 is under agitation sprayed to clear water and silicate cement, fully mix, obtain material 3;
4) gained material 3 use Squeezinggranulators are made to 2cm spherical particle, obtain material 4;
5) by material 4 Xu's maintenance 24 hours, make its sclerosis for subsequent use;
Zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate, four weight percents are 3%:20%:12%:65%.
The preparation method of described absorption reaction wall filler, comprise the following steps: the biomass absorbent material that is 15～50mm by granularity and silicate cement (label 325) under agitation spray clear water, biomass absorbent material and silicate weight percent are 35%:65%, fully mix, extruder grain is made 2cm spherical particle subsequently, maintenance 24 hours again, makes its sclerosis for subsequent use.
The width of described double-deck permeable reactive barrier is 1.5 times of pollutent plume width.
The dummy system, method of described double-deck permeable reactive barrier comprises the following steps:
1) dig out two irrigation canals and ditches in predetermined position, between two irrigation canals and ditches, leave spacing;
2) bottom of reduction reaction wall and absorption reaction wall is deep into respectively watertight layer 0.7m, 0.8m, top is respectively higher than underground water top water-level 0.4m, 0.5m, the width of two walls is got 1.5 times of pollutent plume width, wherein the thickness D of reduction reaction wall can be calculated by formula D=vt, wherein v is average groundwater velocity, unit is cm/s, adopts Peak Flow Rate value in design; T repairs the required reaction times of pollutent, and pollutent is in the residence time of reaction wall, and unit is s, and the strong thickness requirement of absorption reaction is not strict, approaches with reduction reaction wall thickness.
The requirement of the width of two permeable reactive walls, the degree of depth, thickness more than meeting, makes irony frame, and is arranged in irrigation canals and ditches;
3) all to need to adopt thickness be that 4mm high-density polyethylene material is prepared the cubes stuffing box that the length of side is 1m for reduction reaction wall and absorption reaction wall, is wherein respectively covered with perpendicular to two metopes before and after water (flow) direction 64 of the apertures that radius is 1cm;
4) reduction reaction wall and absorption reaction wall sphere-packing particle are separately filled to respectively to corresponding reduction and adsorption stuffing case, reduction and adsorption stuffing case order are put into corresponding reduction reaction wall and absorption reaction; Reduction reaction wall is front, and absorption reaction wall is rear; Spacing between reduction reaction wall and absorption reaction wall is 5m.
The beneficial effect of this embodiment:
By chromium pollutant concentration in the monitor well monitoring underground water that lay double-layer osmotic reaction wall front and back in the venue.Result shows: whole system operation is after 200 days, and chromium pollutant mean concns, by original 122.5mg/L, is reduced to 27.5mg/L, and clearance is 77.6%.
Claims (7)
1. repair the double-deck permeable reactive barrier system of pollution of chromium underground water for one kind, it is characterized in that: formed by reduction reaction wall and absorption reaction wall, reduction reaction wall is front, absorption reaction wall is rear, spacing between reduction reaction wall and absorption reaction wall is 2.5-5m, the bottom of reduction reaction wall and absorption reaction wall is all deep into watertight layer at least 0.60～0.8m, and top all need be higher than underground water top water-level 0.4～0.5m.
2. a kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water according to claim 1, it is characterized in that: the reaction wall packing material size 1～2cm of described reduction reaction wall, filled media is for having zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate, and four weight percents are 2-5%:15-20%:8-12%:63-75%; The pH value of the mixture of zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate is 8.05 ± 0.25; PERFORMANCE OF MODIFIED VERMICULITE composition weight percent is SiO
237～42%, Al
2o
39～14%, Fe
2o
35～9%, MgO11～23%, TiO
22～6%, K
2o3～6%, CaO5～33%; PERFORMANCE OF MODIFIED VERMICULITE particle size range is 0.35～1.45mm; Stalk particle particle size range is 0.1～85mm; Silicate is silicate cement (label 325).
3. a kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water according to claim 1, is characterized in that: the filled media of described absorption reaction wall is biomass sorbing material and silicate, and the two weight percent is 20-35%:65-80%; Biomass absorbent material is shell, bamboo or stalk, and biomass absorbent material granule particle size range is 10～50mm, and silicate is silicate cement (label 325).
4. a kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water according to claim 1, is characterized in that: described reduction reaction wall filler preparation method, comprises the following steps:
1) vermiculite that is 0.35～1.45mm by granularity carries out under 75～95 ℃ of conditions with weak acid and weak base solution after 2～4 secondary ion exchanges, washing, be positioned in baking oven and be dried 2.5～3.5 hours under 60 ℃～80 ℃ conditions, pass into the roasting 2.5～3.5 hours under 200 ℃ of conditions of tube furnace of protection gas nitrogen, wherein the blending ratio of vermiculite and weak acid and weak base is volume ratio 1:10-20; Obtain material 1;
2) in material 1, add zeroth order iron powder, straw powder to continue to mix, obtain material 2;
3) gained material 2 is under agitation sprayed to clear water and silicate cement, fully mix, obtain material 3;
4) gained material 3 use Squeezinggranulators are made to 1～2cm spherical particle, obtain material 4;
5) by material 4 Xu's maintenance 24 hours, make its sclerosis for subsequent use;
Zeroth order iron powder, stalk, PERFORMANCE OF MODIFIED VERMICULITE and silicate, four weight percents are 2-5%:15-20%:8-12%:63-75%.
5. a kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water according to claim 1, it is characterized in that: the preparation method of described absorption reaction wall filler, comprise the following steps: the biomass absorbent material that is 10～50mm by granularity and silicate cement (label 325) under agitation spray clear water, material sorbing material and silicate weight percent are 20-35%:65-80%, fully mix, extruder grain is made 1～2cm spherical particle subsequently, maintenance 24 hours again, makes its sclerosis for subsequent use.
6. a kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water according to claim 1, is characterized in that: the width of described double-deck permeable reactive barrier is 1.3～1.5 times of pollutent plume width.
7. a kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water according to claim 1, is characterized in that:
The dummy system, method of described double-deck permeable reactive barrier comprises the following steps:
1) dig out two irrigation canals and ditches in predetermined position, between two irrigation canals and ditches, leave spacing;
2) bottom of reduction reaction wall and absorption reaction wall is all deep into watertight layer at least 0.60～0.8m, and top all need be higher than underground water top water-level 0.4～0.5m; The width of two walls is got 1.3～1.5 times of pollutent plume width, and wherein the thickness D of reduction reaction wall can be calculated by formula D=vt, and wherein v is average groundwater velocity, and unit is cm/s, adopts Peak Flow Rate value in design; T repairs the required reaction times of pollutent, and pollutent is in the residence time of reaction wall, and unit is s, and the thickness of absorption reaction wall and reduction reaction wall thickness approach;
The requirement of the width of two permeable reactive walls, the degree of depth, thickness more than meeting, makes irony frame, and is arranged in irrigation canals and ditches;
3) all to need to adopt thickness be that 3～5mm high-density polyethylene material is prepared the cubes stuffing box that the length of side is 1m for reduction reaction wall and absorption reaction wall, is wherein respectively covered with perpendicular to two metopes before and after water (flow) direction 64 of the apertures that radius is 1cm;
4) reduction reaction wall and absorption reaction wall sphere-packing particle are separately filled to respectively to corresponding reduction and adsorption stuffing case, reduction and adsorption stuffing case are sequentially put into corresponding reduction reaction wall and absorption reaction within the walls; Reduction reaction wall is front, and absorption reaction wall is rear; Spacing between reduction reaction wall and absorption reaction wall is 2.5-5m.
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