CN105414160A - Device and method for repairing hexavalent chromium-polluted groundwater by virtue of up-flow PRB technology - Google Patents
Device and method for repairing hexavalent chromium-polluted groundwater by virtue of up-flow PRB technology Download PDFInfo
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- CN105414160A CN105414160A CN201510961126.XA CN201510961126A CN105414160A CN 105414160 A CN105414160 A CN 105414160A CN 201510961126 A CN201510961126 A CN 201510961126A CN 105414160 A CN105414160 A CN 105414160A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a device for repairing hexavalent chromium-polluted groundwater by virtue of an up-flow PRB technology. A water pumping system comprises a water pumping well, a well tube and a submerged pump, wherein the well tube is arranged in the water pumping well, a sieve tube is arranged at the middle-lower part of the well tube, the submerged pump is arranged in the sieve tube, one end of a guide tube is connected and communicated with a water outlet of the submerged pump, and the other end of the guide tube stretches out of the well tube and is connected and communicated with a booster pump on the ground; and an outlet of the booster pump is connected with a water distribution main tube, a plurality of water distribution branch tubes are connected with the water distribution main tube, a filler box is provided with an adsorption filling layer and a reduction reaction filler layer from top down, the plurality of water distribution branch tubes are radially distributed on the lower part of the reduction reaction filler layer, a penetrable layer is arranged in an outer baffle, the filler box is arranged in the penetrable layer and surrounded by penetrable mediums in the penetrable layer, an upper cover plate is arranged at the top of the outer baffle, and an overflow channel is arranged between the top of the filler box and the upper cover plate. The device disclosed by the invention is capable of reducing construction difficulty and repair cost, facilitating replacement for a repair material, and increasing repair efficiency.
Description
Technical field
The present invention relates to the devices and methods therefor of the repairing hexavalent chromium polluted underground water of a kind of up flow type PRB technology, belong to groundwater remediation technical field.
Background technology
Along with the quickening day by day of socioeconomic fast development and process of industrialization, underground water pollution problem is day by day serious, hexavalent chromium polluted particularly noticeable due to its significant harmfulness wherein in underground water.Cr VI is studied confirmation " three cause " pollutant, and it is main with CrO4 in soil and groundwater
2 ~and HCrO
4 ~exist etc. form, solubility is strong, easily moves, is decided to be in environment and endangers one of maximum pollutant, must control effectively to it.
At present, mainly adopting two kinds of technology to repair for hexavalent chromium polluted underground water, is extracting treatment technology and original position PRB recovery technique respectively.
1), pump-and-treat system recovery technique (P & T) is the classical recovery technique of underground water dystopy process, and apply latter stage in last century comparatively extensive abroad, it is released by contaminated underground water, then processes on the ground.Owing to being transferred on ground by the process place of underground water, therefore optional technology is more, is applicable to the groundwater treatment of all types of pollution.But the shortcomings such as it is long that this technology has repair time, and rehabilitation cost is high, and treatment effeciency is low, thus in reparation field in recent years, this technology does not obtain large-scale propagation and employment.
2), original position PRB (PermeableReactiveBarrier) recovery technique.PRB recovery technique is the abbreviation of permeable reaction wall recovery technique, it is by installing permeable reaction material body of wall to tackle underground water pollution plumage in underground, the multiple reactions such as Pollution Plume and reaction wall medium generation physics, chemistry, absorption, thus reduce underground water target pollutant concentration.Traditional PRB technology is a kind of passive based technique for in-situ remediation, and its repairing effect and hydrogeologic condition have very large associating.When Polluted area soil layer infiltration coefficient to be repaired is less, traditional PRB repairing effect is relatively poor; Meanwhile, traditional PRB technology, when carrying out extensive area groundwater remediation, often needs dig on a wide area, and this not only causes difficulty of construction large, and rehabilitation cost increases, and is also unfavorable for the replacing of later stage PRB reaction material simultaneously.
Summary of the invention
The object of this invention is to provide one and can reduce difficulty of construction and rehabilitation cost, conveniently repair materials is changed, the devices and methods therefor of the repairing hexavalent chromium polluted underground water of up flow type PRB technology of the efficiency of repairing can be improved.
The present invention is the technical scheme achieved the above object: the device of the repairing hexavalent chromium polluted underground water of a kind of up flow type PRB technology, it is characterized in that: comprise pumping system, water distribution system and filling system, described pumping system comprises pumped well, well casing and immersible pump, well casing is provided with in pumped well, the middle and lower part of well casing has the screen casing in below the water level face for being placed on target stains water-bearing layer, immersible pump is arranged in screen casing, tube at one end be connected with the delivery port of immersible pump communicate, the other end stretches out well casing and is connected with ground booster pump and communicate, described water distribution system comprises booster pump, water distribution supervisor and multiple water distribution branch pipe, and supercharging delivery side of pump is responsible for water distribution and is connected, and multiple water distribution branch pipe is responsible for water distribution and is connected, and each water distribution branch pipe is provided with multiple apopore along tube wall, described filling system comprises outer baffle, upper cover plate, stuffing box and reduction reaction packing layer, absorption packed layer and permeable formation, described stuffing box is provided with absorption packed layer and reduction reaction packing layer from top to bottom, multiple water distribution branch pipe is laid in the bottom of reduction reaction packing layer radially, permeable formation is arranged in outer baffle, stuffing box to be arranged in permeable formation and to be surrounded by the permeating medium in permeable formation, absorption packed layer and reduction reaction packing layer and permeable formation separate by the base plate of stuffing box and the coaming plate of periphery, the top of outer baffle is provided with upper cover plate, the overflow runner flow through for repairing rear underground water is provided with between stuffing box top and upper cover plate, reduction reaction medium in reduction reaction packing layer is used for the hexavalent chromium pollutant in underground water to be reduced to trivalent chromium, adsorbing medium in described absorption packed layer is used for remaining hexavalent chromium pollutant in attached ground water, permeating medium in described permeable formation is for permeating the underground water after reparation.
Wherein: the reduction reaction medium of described reduction reaction packing layer is the iron powder of particle diameter at 1 ~ 5mm.
Adsorbing medium in described absorption packed layer is that the zeolite of particle diameter at 1mm ~ 8mm is or/and activated carbon.
By mass percentage, described permeable formation fills out interior permeating medium is that the particle diameter of 50 ~ 70% is at the gravel of 0.15mm ~ 0.55mm and the particle diameter of 30 ~ 50% gravel at 0.56mm ~ 1.0mm.
Described conduit top is provided with sample tap.
There is between described well casing and pumped well bentonite sealant, between screen casing and pumped well, be filled with the gravel of particle diameter at 0.5mm ~ 10mm.
The method that the present invention utilizes the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology to repair hexavalent chromium pollutant in underground water: pumping system and water distribution system are arranged along water (flow) direction or Pollution Plume radiation direction, and pumping system is arranged on the downstream of current, water distribution system is arranged on the upstream of current, filling system is arranged on the upper epidermis of the soil of current upstream, to be arranged in well casing and the immersible pump being positioned at below target stains water-bearing layer liquid level by the groundwater extraction that pollutes to ground, be transported in the booster pump of water distribution system by conduit, during the water distribution of the underground water of pollution through being transported to water distribution system is responsible for by booster pump, and by multiple water distribution branch pipe the underground water of pollution is evenly distributed in the reduction reaction packing layer in stuffing box, the underground water polluted presents up flow type motion mode in stuffing box, hexavalent chrome reduction in the underground water of upwards flowing pollution is reacted into the trivalent chromium of low toxicity by the reduction reaction medium in reduction reaction packing layer, upwards also stream enters in absorption packed layer again, adsorbing medium in absorption packed layer adsorbs remaining Cr VI in the underground water of flowing, underground water after repairing flows in permeable formation from the overflow runner between stuffing box top and upper cover plate, underground water under gravity, enter upstream region shallow-layer aqueous soil layer by the permeating medium in permeable formation and enter in underground water, when the underground water of pollution is transported to booster pump by conduit, sampled by the sample tap on aqueduct, the reparation situation of monitoring underground water, to arriving groundwater remediation to desired value.
Wherein: the center of described pumping system and the distance at water distribution system center are at 10 ~ 20m.
Prosthetic device of the present invention adopts pumping system, water distribution system and filling system, by pumping system and water distribution system, target stains ground water circulation is taken out note in filling system, because water distribution system have employed booster pump, the underground water up flow type water outlet realizing polluting is by the adsorbing medium in the reduction reaction medium in the reduction reaction packing layer in stuffing box and absorption packed layer, due to underground water flowing in up flow type in stuffing box of polluting, therefore while the underground water polluted is repaired, the effect of flushing can also be played, the blockage problem of reaction material can be solved dramatically, greatly improve the effect of reparation.Filling system of the present invention have employed outer baffle, upper cover plate, stuffing box and reduction reaction packing layer, absorption packed layer and permeable formation, permeable formation is provided with in outer baffle, can just be separated with the soil of upper epidermis by permeable formation by baffle plate, because absorption packed layer in it of the base plate of stuffing box and coaming plate and reduction reaction packing layer separate with outside permeable formation, make the underground water of pollution in stuffing box, present up flow type motion mode, carrying out in repair process to underground water, the dielectric material in reduction reaction packing layer, absorption packed layer and permeable formation can be prevented to run off.The underground water of the present invention's upwards flowing pollution is when the reduction reaction medium of reduction reaction packing layer, hexavalent chrome reduction in the underground water of pollution is reacted into the trivalent chromium of low toxicity, again upwards and flow to enter into absorption packed layer in, by the adsorbing medium adsorbing packed layer, remaining Cr VI in the underground water of flowing is adsorbed, guide underground water to flow to permeable formation by the overflow runner between stuffing box top and upper cover plate, and enter in upstream region shallow-layer aqueous soil layer at Action of Gravity Field.Filling system is arranged on the upper epidermis position of soil by the present invention, facilitate the installation of prosthetic device and the operation and management in later stage, constructability and management, workable, especially in the filling system being convenient to the later stage, material is changed and management, greatly reduces the cost of reparation and construction and the cost runed.Prosthetic device of the present invention utilizes the dual mechanism of the reduction reaction medium in former reaction packing layer and the adsorbing medium in absorption packed layer, that can remove in underground water to greatest extent is hexavalent chromium polluted, realize the efficient removal object of hexavalent chromium pollutant, and the underground water after repair process is from permeable formation seepage flow to upstream region shallow-layer aqueous soil layer through overflow runner and at Action of Gravity Field, in running, the circulation of pumping system and water distribution system is taken out water injection manifold and can be played cycling elution effect to soil, can promote that the pollutant in soil moves in underground water, thus improve reparation speed and the effect of underground water and soil, while reparation underground water, that has also repaired in soil is hexavalent chromium polluted, the effect of repairing can be ensured to greatest extent.Pumping system is arranged on the downstream of underground water by the present invention, by the extracting effect of extraction system, the migration velocity of underground water in soil can be accelerated, to improve the mobility of underground water in underground, improve the adaptability of PRB recovery technique for hyposmosis soil, also shorten the cycle required for whole repair process simultaneously.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
Fig. 1 is the structural representation of the repairing hexavalent chromium polluted underground water device of up flow type PRB technology of the present invention.
Fig. 2 is the water distribution sectional view of filling system of the present invention.
Wherein: 1-outer baffle, 2-upper cover plate, 3-permeable formation, 4-reduction reaction packing layer, 5-absorption packed layer, 6-booster pump, 7-water distribution is responsible for, 8-water distribution branch pipe, 9-stuffing box, 10-overburden layer, 11-sample tap, 12-shallow-layer aqueous soil layer, 13-conduit, 14-pumped well, 15-well casing, 16-sealant, 17-gravel, 18-screen casing, 19-immersible pump.
Detailed description of the invention
See shown in Fig. 1 ~ 2, the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology of the present invention, comprise pumping system, water distribution system and filling system, in use, pumping system and water distribution system can be arranged along water (flow) direction or Pollution Plume radiation direction, and pumping system is arranged on the downstream of current, water distribution system is arranged on the upstream of current, and filling system is arranged on the upper epidermis position of the upstream soil of current, facility is simple, be easy to construction and management, workable, the material being convenient to the later stage is changed and management, greatly reduces the cost of reparation.
As shown in Figure 1, pumping system of the present invention comprises pumped well 14, well casing 15 and immersible pump 19, well casing 15 is provided with in pumped well 14, the middle and lower part of well casing 15 has the screen casing 18 in below the water level face for being placed on target stains water-bearing layer, the caliber of well casing 15 is at 60mm ~ 200mm, and the caliber of screen casing 18 is identical with well casing 15 caliber, screen casing 15 hole is at 0.1mm ~ 1mm, 1m ~ 10m below the water level face that screen casing 18 part can be positioned at target stains water-bearing layer, immersible pump 19 is arranged in screen casing 18, immersible pump 19 can be positioned at below target stains aquifer water plane 1m ~ 5m, conduit 13 one end is connected with the delivery port of immersible pump 19 and communicates, the other end stretches out well casing 15 and is connected with ground booster pump 6 and communicates, the groundwater extraction of pollution is responsible for 7 to water distribution and is distributed in reduction reaction packing layer 4 through multiple water distribution branch pipe 8, conduit 13 top is provided with sample tap 11, therefore the underground water by the 11 pairs of extractings of this sample tap detects.As shown in Figure 1, the present invention has bentonite sealant 16 between well casing 15 and pumped well 14, the gravel 17 of particle diameter at 0.5mm ~ 10mm is filled with between screen casing 18 and pumped well 14, make the underground water in target stains water-bearing layer by entering in pumped well 14 by hole on screen casing 18 after gravel 17, then by immersible pump 19 and conduit 13 extracting to ground.
See Fig. 1, shown in 2, water distribution system of the present invention comprises booster pump 6, water distribution supervisor 7 and multiple water distribution branch pipe 8, outlet and the water distribution of booster pump 6 are responsible for 7 and are connected, the operating pressure of booster pump 6 can at 0.1 ~ 0.5MPa, multiple water distribution branch pipe 8 and water distribution are responsible for 7 and are connected, the caliber of water distribution supervisor 7 can at 30mm ~ 100mm, the caliber of water distribution branch pipe 8 can at 30mm ~ 100mm, and each water distribution branch pipe 8 is provided with multiple apopore along tube wall, this water distribution branch pipe 8 is provided with 3 ~ 10 apopores, and apopore aperture can at 0.1mm ~ 1mm, the underground water of pollution is distributed in filling system by water distribution system.As shown in Figure 2, water distribution branch pipe 8 of the present invention is responsible for 7 radially and is connected and is arranged in reduction reaction packing layer 4 with water distribution.
As shown in Figure 1, filling system of the present invention comprises outer baffle 1, upper cover plate 2, stuffing box 9 and reduction reaction packing layer 4, absorption packed layer 5 and permeable formation 3.Stuffing box 9 of the present invention is provided with absorption packed layer 5 and reduction reaction packing layer 4 from top to bottom, this stuffing box 9 is made up of ABS plastic, can be made up of base plate and coaming plate split, or make integrative-structure, stuffing box 9 and outer baffle 1 shape are not limit, reduction reaction medium and the adsorbing medium of being convenient to the later stage are changed and management, multiple water distribution branch pipes 8 are laid in the bottom of reduction reaction packing layer 4 radially, permeable formation 3 is arranged in outer baffle 1, outer baffle 1 of the present invention can adopt ABS plastic etc., outer baffle 1 is for to prevent permeating medium material to run off, stuffing box 9 to be arranged in permeable formation 3 and to be surrounded by the permeating medium in permeable formation 3, absorption packed layer 5 and reduction reaction packing layer 4 separate with permeable formation 3 by the base plate of stuffing box 9 and the coaming plate of periphery, the top of outer baffle 1 is provided with upper cover plate 2, upper cover plate 2 top is also provided with overburden layer 10, the overflow runner flow through for repairing rear underground water is provided with between stuffing box 9 top and upper cover plate 2, after making reparation, underground water can enter in permeable formation 3 from this overflow runner.Reduction reaction medium in reduction reaction packing layer 4 of the present invention is used for the hexavalent chromium pollutant in underground water to be reduced to trivalent chromium, the reduction reaction medium of reduction reaction packing layer 4 of the present invention is the iron powder of particle diameter at 1 ~ 5mm, iron powder of the present invention can adopt zeroth order iron powder, there is very strong reproducibility and with the Cr VI in water, reduction reaction can effectively can occur, underground water after reduction reaction, and reduce the toxicity of underground water.Adsorbing medium in absorption packed layer 5 is used for remaining hexavalent chromium pollutant in attached ground water, the present invention's adsorbing medium adsorbed in packed layer 5 is that the zeolite of particle diameter at 1mm ~ 8mm is or/and activated carbon, when zeolite mixes with activated carbon, both ratios are not limit by mass percentage, and both particle diameters are not limit, as 50%, particle diameter is at 1mm zeolite and 50%, particle diameter is at the activated carbon of 1mm, by remaining hexavalent chromium pollutant in adsorbing medium strong adsorption underground water, and improve chromic removal effect further, the present invention by reduction reaction and the dual mechanism of strong adsorption, that can remove in underground water to greatest extent is hexavalent chromium polluted, realize the efficient removal object of hexavalent chromium pollutant.As shown in Figure 1, permeating medium in permeable formation 3 of the present invention is for permeating the underground water after reparation, by mass percentage, permeating medium in permeable formation 3 is that the particle diameter of 50 ~ 70% is at the gravel of 0.15mm ~ 0.55mm and the particle diameter of 30 ~ 50% gravel at 0.56mm ~ 1.0mm, and the effect of rapid osmotic can be reached, is entered again in underground water in the shallow-layer aqueous soil layer 12 that underground water after process is entered bottom under gravity by permeable formation 3, while reparation underground water, hexavalent chromium polluted in soil is repaired, the effect of repairing can be ensured to greatest extent.
The method that the present invention repairs hexavalent chromium pollutant in underground water: pumping system and water distribution system are arranged along water (flow) direction or Pollution Plume radiation direction, and pumping system is arranged on the downstream of current, water distribution system is arranged on the upstream of current, both distances can be tested according to hydrogeological actual conditions and determine, the center of pumping system and the distance at water distribution system center are at 10 ~ 20m, be catheter center and water distribution is responsible for centre distance at 10 ~ 20m, filling system is arranged on the upper epidermis of the soil of current upstream, to be arranged in well casing 15 and the immersible pump 19 being positioned at below target stains water-bearing layer liquid level by the groundwater extraction that pollutes to ground, be transported in the booster pump 6 of water distribution system by conduit 13, by booster pump 6, the water distribution of the underground water of pollution through being transported to water distribution system is responsible in 7 again, and by multiple water distribution branch pipe 8 underground water of pollution is evenly distributed in the reduction reaction packing layer 4 in stuffing box 9, the underground water polluted presents up flow type motion mode in stuffing box 9, and through the reduction reaction medium of reduction reaction packing layer 4, the hexavalent chrome reduction in the underground water of upwards flowing pollution is reacted into the trivalent chromium of low toxicity, again upwards and flow to enter into absorption packed layer 5 in, adsorbing medium in absorption packed layer 5 adsorbs remaining Cr VI in the underground water of flowing, underground water after repairing flows in permeable formation 3 from the overflow runner between stuffing box 9 top and upper cover plate 2, because water outlet is that up flow type is by stuffing box 9, the blockage problem of PRB material can be solved dramatically, greatly improve the effect of reparation, underground water after reparation under gravity, enter upstream region shallow-layer aqueous soil layer 12 by the permeating medium in permeable formation 3 and enter in underground water, when the underground water of pollution is transported to booster pump 6 by conduit 13, sampled by the sample tap 11 on aqueduct, can timing or grab sample, the reparation situation of monitoring underground water, to arriving groundwater remediation to desired value, be that Cr VI average removal rate reaches more than 95% as repaired to desired value.
The present invention repairs hexavalent chromium pollutant in the underground water in certain hexavalent chromium polluted region, this groundwater level depth 4m, water-bearing layer thickness 10m, and aeration zone and water-bearing layer are mainly weak soil, and soil layer infiltration coefficient is 9 × 10
~ 7cm/s, this Polluted area quality of groundwater: pH is 6.95; In underground water, Cr VI mean concentration is 12.6mg/L, the top of screen casing 18 is positioned at below underground water liquid level 1m by the present invention, immersible pump is positioned at below underground water liquid level 6m, the gravel particle diameter of filling between screen casing 18 and pumped well 14 is at 10mm, the pump speed 400mL/min of immersible pump 19, other design parameter is shown in Table 1.
Table 1
The present invention monitors once to water quality in every 8 hours, and measure mode by GB-T7467-87 and measure, stable latter 80 days, monitored by sample tap 10 pairs of water quality, the concrete data of the underground water after reparation were shown in Table 2.
Table 2
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| Hexavalent chromium concentration (mg/L) | 0.5 | 0.51 | 0.38 | 0.37 | 0.25 | 0.5 |
| Cr VI average removal rate (%) | 96 | 96 | 97 | 97 | 98 | 96 |
As can be seen from Table 2, the underground water after reparation reaches to be repaired to desired value.Device of the present invention is in running, circulation due to pumping system and water distribution system is taken out water injection manifold and can be played cycling elution effect to soil, can promote that the pollutant in soil moves in underground water, thus improve reparation speed and the effect of underground water and soil.Meanwhile, also accelerate the migration velocity of underground water in soil, the cycle of whole reparation can be shortened.
Claims (8)
1. the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology, it is characterized in that: comprise pumping system, water distribution system and filling system, described pumping system comprises pumped well (14), well casing (15) and immersible pump (19), well casing (15) is provided with in pumped well (14), the middle and lower part of well casing (15) has the screen casing (18) in below the water level face for being placed on target stains water-bearing layer, immersible pump (19) is arranged in screen casing (18), conduit (13) one end is connected with the delivery port of immersible pump (19) and communicates, the other end stretches out well casing (15) and is connected with ground booster pump (6) and communicates, described water distribution system comprises booster pump (6), water distribution supervisor (7) and multiple water distribution branch pipe (8), the outlet of booster pump (6) is responsible for (7) and is connected with water distribution, multiple water distribution branch pipe (8) is responsible for (7) and is connected with water distribution, and each water distribution branch pipe (8) is provided with multiple apopore along tube wall, described filling system comprises outer baffle (1), upper cover plate (2), stuffing box (9) and reduction reaction packing layer (4), absorption packed layer (5) and permeable formation (3), described stuffing box (9) is provided with absorption packed layer (5) and reduction reaction packing layer (4) from top to bottom, multiple water distribution branch pipe (8) is laid in the bottom of reduction reaction packing layer (4) radially, permeable formation (3) is arranged in outer baffle (1), stuffing box (9) to be arranged in permeable formation (3) and to be surrounded by the permeating medium in permeable formation (3), the base plate of stuffing box (9) and the coaming plate of periphery will adsorb packed layer (5) and reduction reaction packing layer (4) separates with permeable formation (3), the top of outer baffle (1) is provided with upper cover plate (2), the overflow runner flow through for repairing rear underground water is provided with between stuffing box (9) top and upper cover plate (2), reduction reaction medium in reduction reaction packing layer (4) is used for the hexavalent chromium pollutant in underground water to be reduced to trivalent chromium, adsorbing medium in described absorption packed layer (5) is used for remaining hexavalent chromium pollutant in attached ground water, permeating medium in described permeable formation (3) is for permeating the underground water after reparation.
2. the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology according to claim 1, is characterized in that: the reduction reaction medium of described reduction reaction packing layer (4) is the iron powder of particle diameter at 1 ~ 5mm.
3. the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology according to claim 1, is characterized in that: the adsorbing medium in described absorption packed layer (5) is that the zeolite of particle diameter at 1mm ~ 8mm is or/and activated carbon.
4. the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology according to claim 1, it is characterized in that: by mass percentage, described permeable formation (3) fill out that interior permeating medium is 50 ~ 70%, particle diameter at the gravel and 30 ~ 50% of 0.15mm ~ 0.55mm, particle diameter at the gravel of 0.56mm ~ 1.0mm.
5. the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology according to claim 1, is characterized in that: described conduit (13) top is provided with sample tap (11).
6. the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology according to claim 1, it is characterized in that: there is between described well casing (15) and pumped well (14) bentonite sealant (16), between screen casing (18) and pumped well (14), be filled with the gravel of particle diameter at 0.5mm ~ 10mm.
7. utilize the method that the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology described in claim 1 is repaired hexavalent chromium pollutant in underground water: pumping system and water distribution system are arranged along water (flow) direction or Pollution Plume radiation direction, and pumping system is arranged on the downstream of current, water distribution system is arranged on the upstream of current, filling system is arranged on the upper epidermis of the soil of current upstream, to be arranged in well casing (15) and the immersible pump (19) being positioned at below target stains water-bearing layer liquid level by the groundwater extraction that pollutes to ground, be transported in the booster pump (6) of water distribution system by conduit (13), the water distribution of the underground water of pollution through being transported to water distribution system is responsible in (7) by booster pump (6), and by multiple water distribution branch pipe (8) underground water of pollution is evenly distributed in the reduction reaction packing layer (4) in stuffing box (9), the underground water polluted presents up flow type motion mode in stuffing box (9), and the hexavalent chrome reduction in the underground water of upwards flowing pollution is reacted into the trivalent chromium of low toxicity by reduction reaction medium in reduction reaction packing layer (4), upwards also stream enters in absorption packed layer (5) again, adsorbing medium in absorption packed layer (5) adsorbs remaining Cr VI in the underground water of flowing, underground water after repairing flows in permeable formation (3) from the overflow runner between stuffing box (9) top and upper cover plate (2), underground water under gravity, enter upstream region shallow-layer aqueous soil layer (12) by the permeating medium in permeable formation (3) and enter in underground water, when the underground water of pollution is transported to booster pump (6) by conduit (13), sampled by the sample tap (11) on aqueduct, the reparation situation of monitoring underground water, to arriving groundwater remediation to desired value.
8. the device of the repairing hexavalent chromium polluted underground water of up flow type PRB technology according to claim 7 is to the method for hexavalent chromium pollutant reparation in underground water, it is characterized in that: the center of described pumping system and the distance at water distribution system center are at 10 ~ 20m.
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