CN103880107B - A kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water - Google Patents
A kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water Download PDFInfo
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- CN103880107B CN103880107B CN201410088161.0A CN201410088161A CN103880107B CN 103880107 B CN103880107 B CN 103880107B CN 201410088161 A CN201410088161 A CN 201410088161A CN 103880107 B CN103880107 B CN 103880107B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 29
- 239000011651 chromium Substances 0.000 title claims abstract description 29
- 230000004888 barrier function Effects 0.000 title claims abstract description 23
- 238000006722 reduction reaction Methods 0.000 claims abstract description 79
- 238000010521 absorption reaction Methods 0.000 claims abstract description 63
- 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
- 230000009467 reduction Effects 0.000 claims abstract description 12
- 238000001179 sorption measurement Methods 0.000 claims abstract description 11
- 239000003673 groundwater Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 60
- 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
- 239000002250 absorbent Substances 0.000 claims description 19
- 230000002745 absorbent Effects 0.000 claims description 19
- 239000003469 silicate cement Substances 0.000 claims description 16
- 230000002262 irrigation Effects 0.000 claims description 12
- 238000003973 irrigation Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 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
- 238000002156 mixing 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
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 229910010413 TiO 2 Inorganic materials 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
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 239000010902 straw 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
- 150000002500 ions Chemical group 0.000 claims description 2
- 241000894007 species Species 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 7
- 230000002829 reductive effect Effects 0.000 abstract description 7
- 238000010790 dilution Methods 0.000 abstract description 3
- 239000012895 dilution Substances 0.000 abstract description 3
- 229920006395 saturated elastomer Polymers 0.000 abstract description 3
- 239000003463 adsorbent Substances 0.000 abstract description 2
- 239000000356 contaminant Substances 0.000 abstract description 2
- 239000005416 organic matter Substances 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 238000005342 ion exchange Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 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
- 230000002265 prevention 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
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000000524 functional group Chemical group 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
- 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
Abstract
A kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water, be made up of 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, top all need higher than underground water top water-level 0.4 ~ 0.5m, during use, contaminated water flow is first by reduction reaction wall, again by absorption reaction wall, when pollution of chromium groundwater flow through time, first through reduction reaction wall and zeroth order iron powder generation reduction reaction, sexavalent chrome can be made to be converted into trivalent chromium, organic matter in stalk can be used as electron donor, promote chromic reduction, absorption reaction wall then has huge surface area by biomass adsorbent, strong adsorption contaminant remaining, solve reductive agent to be flushed away, reduzate is washed away by dilution, reductive agent uses saturated and does not reach the problems such as chromic reduction, realize the economy of pollution of chromium in underground water, efficient removal.
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 kinds of maximum chemical substances of harm, is one of internationally recognized three kinds of carcinogenic metal objects, is also simultaneously one of U.S. EPA 129 kinds of priority pollutants of generally acknowledging.
Reparation by the underground water of pollution of chromium adopts extraction-surface chemistry facture usually, but have that cost is high, the cycle is 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 the existence of excessive reductive agent, the problems such as reductive agent is flushed away, reduzate is washed away by dilution, reductive agent use is saturated therefore in actual use procedure, can be there is.
Simultaneously, underwater prevention by pollution of chromium is also administered by methods such as absorption, chemical precipitation, ion-exchange, filtration, membrane techniquies, wherein, absorption method can adapt to water quantity and quality change preferably, simple to operate, cheap, and sorbent material is easy to regeneration, not easily cause secondary pollution, thus application prospect is extensive.
Vermiculite is extensively present in environment, generally there is larger specific surface area, within the scope of common pH, to the metal ion in water, there is good adsorptive power usually, by the chromium pollutant in the effect Adsorption water such as the ion-exchange of its surface functional group and complexing, engineer applied 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, realizing 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, be made up of 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 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 by 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 absorbent 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) by granularity be that the vermiculite weak acid and weak base solution of 0.35 ~ 1.45mm carries out under 75 ~ 95 DEG C of conditions that 2 ~ 4 secondary ions exchange, after washing, to be positioned in baking oven under 60 DEG C ~ 80 DEG C conditions dry 2.5 ~ 3.5 hours, pass into the roasting 2.5 ~ 3.5 hours under tube furnace 200 DEG C of conditions 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 continues to mix, obtain material 2;
3) gained material 2 is under agitation sprayed clear water and silicate cement, fully mix, obtain material 3;
4) gained material 3 Squeezinggranulator is made 1 ~ 2cm spherical particle, obtain material 4;
5) by material 4 Xu maintenance 24 hours, it is made to harden 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: be that biomass absorbent material and the silicate cement (label 325) of 10 ~ 50mm under agitation sprays clear water by granularity, biomass absorbent material and silicate weight percent are 20-35%:65-80%, abundant mixing, extruder grain makes 1 ~ 2cm spherical particle subsequently, maintenance 24 hours, makes it harden for subsequent use again.
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 higher than underground water top water-level 0.4 ~ 0.5m; The width of two walls gets 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 is for repairing the reaction times needed for pollutent, and namely pollutent is in the residence time of reaction wall, and unit is s, and the thickness of absorption reaction wall is close with reduction reaction wall thickness;
Meet the requirement of the width of above two permeable reactive wall, the degree of depth, thickness, make irony frame, and be arranged in irrigation canals and ditches;
3) reduction reaction wall and absorption reaction wall all need to adopt thickness to be the cubes stuffing box that 3 ~ 5mm high-density polyethylene material prepares that the length of side is 1m, are wherein respectively covered with perpendicular to two metopes before and after water (flow) direction the aperture 64 that radius is 1cm;
4) reduction reaction wall is filled to corresponding reduction and adsorption stuffing case respectively to absorption reaction wall sphere-packing particle separately, reduction and adsorption stuffing case is 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 provided by the invention system of repairing can be used for the underground water repairing pollution of chromium, and during use, contaminated water flow is first by reduction reaction wall, then by absorption reaction wall.When pollution of chromium groundwater flow through time, first through reduction reaction wall and zeroth order iron powder generation reduction reaction, sexavalent chrome can be made to be converted into trivalent chromium.Organic matter in stalk can be used as electron donor, promotes chromic reduction.Absorption reaction wall then has huge surface area, strong adsorption contaminant remaining by biomass adsorbent, solves that reductive agent is flushed away, reduzate is washed away by dilution, 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 formed by reduction reaction wall and absorption reaction wall, can be realized 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, be made up of 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 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 by 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 absorbent 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) be after the vermiculite weak acid and weak base solution of 1.05 ~ 1.35mm carries out 2 secondary ion exchanges, washing under 80 DEG C of conditions by granularity, to be positioned in baking oven under 80 DEG C of conditions dry 3.5 hours, pass into the roasting 2.5 hours under tube furnace 200 DEG C of conditions 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 continues to mix, obtain material 2;
3) gained material 2 is under agitation sprayed clear water and silicate cement, fully mix, obtain material 3;
4) gained material 3 Squeezinggranulator is made 1cm spherical particle, obtain material 4;
5) by material 4 Xu maintenance 24 hours, it is made to harden 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: be that biomass absorbent material and the silicate cement (label 325) of 40 ~ 50mm under agitation sprays clear water by granularity, biomass absorbent material and silicate weight percent are 30%:70%, abundant mixing, extruder grain makes 1cm spherical particle subsequently, maintenance 24 hours, makes it harden for subsequent use again.
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 higher than underground water top water-level 0.5m; The width of two walls gets 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 is for repairing the reaction times needed for pollutent, and namely pollutent is in the residence time of reaction wall, and unit is s, and the strong thickness requirement of absorption reaction is strict, with infiltration reduction reaction wall thickness close to.
Meet the requirement of the width of above two permeable reactive wall, the degree of depth, thickness, make irony frame, and be arranged in irrigation canals and ditches;
3) reduction reaction wall and absorption reaction wall all need to adopt thickness to be the cubes stuffing box that 5mm high-density polyethylene material prepares that the length of side is 1m, are wherein respectively covered with perpendicular to two metopes before and after water (flow) direction the aperture 64 that radius is 1cm;
4) reduction reaction wall is filled to corresponding reduction and adsorption stuffing case respectively to absorption reaction wall sphere-packing particle separately, reduction and adsorption stuffing case is 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 laid before and after the reaction of double-layer osmotic in the venue wall.Result shows: after whole system runs 220 days, and chromium pollutant mean concns, by original 143.5mg/L, reduces 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, be made up of 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 watertight layer 0.7m, 0.8m respectively, 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 by 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 absorbent 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) be after the vermiculite weak acid and weak base solution of 0.35 ~ 1.15mm carries out 3 secondary ion exchanges, washing under 95 DEG C of conditions by granularity, to be positioned in baking oven under 80 DEG C of conditions dry 3 hours, pass into the roasting 2.75 hours under tube furnace 200 DEG C of conditions 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 continues to mix, obtain material 2;
3) gained material 2 is under agitation sprayed clear water and silicate cement, fully mix, obtain material 3;
4) gained material 3 Squeezinggranulator is made 2cm spherical particle, obtain material 4;
5) by material 4 Xu maintenance 24 hours, it is made to harden 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: be that biomass absorbent material and the silicate cement (label 325) of 15 ~ 50mm under agitation sprays clear water by granularity, biomass absorbent material and silicate weight percent are 35%:65%, abundant mixing, extruder grain makes 2cm spherical particle subsequently, maintenance 24 hours, makes it harden for subsequent use again.
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 watertight layer 0.7m, 0.8m respectively, top is respectively higher than underground water top water-level 0.4m, 0.5m, the width of two walls gets 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 is for repairing the reaction times needed for pollutent, and namely pollutent is in the residence time of reaction wall, and unit is s, and the strong thickness requirement of absorption reaction is strict, with reduction reaction wall thickness close to.
Meet the requirement of the width of above two permeable reactive wall, the degree of depth, thickness, make irony frame, and be arranged in irrigation canals and ditches;
3) reduction reaction wall and absorption reaction wall all need to adopt thickness to be the cubes stuffing box that 4mm high-density polyethylene material prepares that the length of side is 1m, are wherein respectively covered with perpendicular to two metopes before and after water (flow) direction the aperture 64 that radius is 1cm;
4) reduction reaction wall is filled to corresponding reduction and adsorption stuffing case respectively to absorption reaction wall sphere-packing particle separately, reduction is put into corresponding reduction reaction wall and absorption reaction to adsorption stuffing case order; 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 laid before and after the reaction of double-layer osmotic in the venue wall.Result shows: after whole system runs 200 days, and chromium pollutant mean concns, by original 122.5mg/L, reduces to 27.5mg/L, and clearance is 77.6%.
Claims (5)
1. repair the double-deck permeable reactive barrier system of pollution of chromium underground water for one kind, it is characterized in that: be made up of 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 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 by 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;
The filled media of described absorption reaction wall is biomass absorbent 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.
2. 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) by granularity be that the vermiculite weak acid and weak base solution of 0.35 ~ 1.45mm carries out under 75 ~ 95 DEG C of conditions that 2 ~ 4 secondary ions exchange, after washing, to be positioned in baking oven under 60 DEG C ~ 80 DEG C conditions dry 2.5 ~ 3.5 hours, pass into the roasting 2.5 ~ 3.5 hours under tube furnace 200 DEG C of conditions 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 continues to mix, obtain material 2;
3) gained material 2 is under agitation sprayed clear water and silicate cement, fully mix, obtain material 3;
4) gained material 3 Squeezinggranulator is made 1 ~ 2cm spherical particle, obtain material 4;
5) by material 4 maintenance 24 hours, it is made to harden 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%.
3. 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: be that biomass absorbent material and the silicate cement of 10 ~ 50mm under agitation sprays clear water by granularity, species adsorbs material and silicate weight percent are 20-35%:65-80%, abundant mixing, extruder grain makes 1 ~ 2cm spherical particle subsequently, then maintenance 24 hours, makes it harden for subsequent use.
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: the width of described double-deck permeable reactive barrier is 1.3 ~ 1.5 times of pollutent plume width.
5. 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 higher than underground water top water-level 0.4 ~ 0.5m; The width of two walls gets 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 is for repairing the reaction times needed for pollutent, and namely pollutent is in the residence time of reaction wall, and unit is s, and the thickness of absorption reaction wall is close with reduction reaction wall thickness;
Meet the requirement of the width of above two permeable reactive wall, the degree of depth, thickness, make irony frame, and be arranged in irrigation canals and ditches;
3) reduction reaction wall and absorption reaction wall all need to adopt thickness to be the cubes stuffing box that 3 ~ 5mm high-density polyethylene material prepares that the length of side is 1m, are wherein respectively covered with perpendicular to two metopes before and after water (flow) direction the aperture 64 that radius is 1cm;
4) reduction reaction wall is filled to corresponding reduction and adsorption stuffing case respectively to absorption reaction wall sphere-packing particle separately, reduction and adsorption stuffing case is 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410088161.0A CN103880107B (en) | 2014-03-11 | 2014-03-11 | A kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410088161.0A CN103880107B (en) | 2014-03-11 | 2014-03-11 | A kind of double-deck permeable reactive barrier system of repairing pollution of chromium underground water |
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| CN104803486B (en) * | 2015-04-21 | 2017-01-18 | 上田环境修复股份有限公司 | Permeable reactive barrier material for groundwater chromium pollution remediation and preparation method thereof |
| CN105236785B (en) * | 2015-08-26 | 2017-06-06 | 北京至清时光环保工程技术有限公司 | Activity diafiltration wall filler |
| CN105414160B (en) * | 2015-12-18 | 2018-06-15 | 江苏维尔利环保科技股份有限公司 | The devices and methods therefor of the repairing hexavalent chromium polluted underground water of up flow type PRB technologies |
| CN105399245B (en) * | 2015-12-18 | 2018-12-11 | 江苏维尔利环保科技股份有限公司 | The prosthetic device and its restorative procedure of hexavalent chromium polluted underground water |
| CN105668680B (en) * | 2016-01-19 | 2018-05-04 | 中国科学院南京土壤研究所 | A kind of method using mercury pollution in magnetic iron ore and bauxite slag in-situ remediation of underground water |
| CN106115818A (en) * | 2016-08-31 | 2016-11-16 | 陈师楚 | A kind of spiral lamina pressure tank |
| CN109225133A (en) * | 2018-09-28 | 2019-01-18 | 中国地质大学（武汉） | FeCl3Modification biological charcoal and preparation method thereof, the method for repairing pollution of chromium underground water |
| CN111112312A (en) * | 2019-12-16 | 2020-05-08 | 安徽洁然环境科技有限公司 | Restoration application of PRB material based on high permeability cement base in long-acting control field |
| CN111924905B (en) * | 2020-08-07 | 2023-01-31 | 中国水电基础局有限公司 | Method for realizing precast concrete permeable reactive wall frame body and outer frame device thereof |
| CN112110571A (en) * | 2020-09-23 | 2020-12-22 | 北京高能时代环境技术股份有限公司 | Permeable reactive barrier and repairing method |
| CN114292061B (en) * | 2021-12-29 | 2022-08-05 | 北京建工环境修复股份有限公司 | Foaming slurry and permeable reaction wall using same as filler |
| CN114477355B (en) * | 2022-01-06 | 2023-12-29 | 中国电建集团华东勘测设计研究院有限公司 | Oxygenation and adsorption coupled permeation reaction wall capable of improving river bank pollution cleaning capacity and application |
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