CN102616960A - Box-type baffling permeable reactive barrier technology - Google Patents
Box-type baffling permeable reactive barrier technology Download PDFInfo
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- CN102616960A CN102616960A CN2012101063070A CN201210106307A CN102616960A CN 102616960 A CN102616960 A CN 102616960A CN 2012101063070 A CN2012101063070 A CN 2012101063070A CN 201210106307 A CN201210106307 A CN 201210106307A CN 102616960 A CN102616960 A CN 102616960A
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Abstract
The invention relates to a box-type baffling permeable reactive barrier technology, which is characterized by comprising the following concrete steps of: pre-filling media into cuboid medium boxes; and dividing a permeable reactive barrier into 2-6 serially connected reaction chambers through the arrangement of the medium boxes, so that water flow passes through a PRB (Permeable Reactive Barriers) reactor in a up-and-down baffling flow state, and pollutants in water can be removed. The box-type baffling permeable reactive barrier technology has the advantages of convenience in filling, regenerating and replacing the reaction media, high mass transfer efficiency and the like; in-situ remediation can be carried out on ground water economically and high-efficiently; and since the media are filled in the medium boxes, the phenomenon of surface collapse cannot be caused even though the mechanical strength of the reaction media is reduced after long-time operation.
Description
Technical field
The present invention relates to a kind of box baffling permeable reactive grid technology, belong to underground water based technique for in-situ remediation field.
Background technology
Underground water is main drinking water source and industrial and agricultural production raw material as the important component part of water resources, and the development with society plays an important role to Chinese national economy.Along with society and expanding economy, the raising of living standards of the people, also increasingly high to the requirement of underground water resources; Yet, since human mishandling to solid, the liquid the like waste produced, life is produced, from different approach underground water is polluted; According to investigations; China's groundwater pollution problem is very serious, and except that natural underground water inferior, the plains region underground water of nearly 25 ﹪ in the whole nation has received pollution in various degree.Common pollutent comprises " three nitrogen ", heavy metal (mercury, cadmium, lead, chromium etc.) and some difficult organism that decomposes in the underground water; Drink contaminated underground water and can cause fearful harm human health; Contaminated underground water is used for industrial production can be accelerated equipment corrosion, influence quality product, even production can not be gone on.Therefore, strengthen defence and the improvement work of groundwater pollution, to ensureing safe drinking water, realize building a well-off society in an all-round way, harmony between man and nature and economic society be comprehensive, coordinates and Sustainable development, have important practical significance and far-reaching strategic importance.
Typical main dystopy recovery technique of underground water recovery technique and based technique for in-situ remediation.The dystopy recovery technique is owing to receive the restriction of underground water hydraulics, and its amount that clears the pollution off is limited, and cost is relatively very high.Based technique for in-situ remediation is to save the technology that extraction is repaired contaminated underground water in position under the interferential condition thinking; Permeable reactive barrier technology (Permeable reactive barriers; PRB) be a kind of underground water based technique for in-situ remediation that develops rapidly in recent years; The PRB technology can effectively be removed pollution substances such as heavy metal in the underground water, inorganic anion, organism, has bright development prospect.This technology reaches does not need the additionaling power device, ground processing facility need be set yet, and except that the needs long term monitoring, needs working cost hardly.The PRB technology exists at operational process to be confirmed as follows: multiple medium compound PRB usually need be adopted for multiple pollutent and the underground water deposited in (1), can give like this to add different media in the construction process and bring very burden; (2) can take place after PRB operation for some time that medium absorption is saturated, phenomenons such as inactivation or obstruction, at this moment need dig out regeneration/replacing being embedded in subterranean reaction medium, at randomly be deposited in subterranean reaction medium regeneration/replacing brought very big inconvenience; (3) certain reaction medium reduces its physical strength because self property changes after operation for some time, causes surface collapse; (4) existing PRB technology water (flow) direction is lateral flow, like the duration of contact of need increase pollutent and reaction medium, can only realize through the thickness of widening reaction medium, causes capital cost to increase.
Summary of the invention
The object of the present invention is to provide a kind of box baffling permeable reactive grid technology, be a kind of be convenient to operational management and can strengthen the antipollution thing technological with the box baffling PRB of reaction medium mass transfer effect; It is convenient that its reaction medium is loaded, regenerates, changed; Change the waterpower fluidised form, increase mass-transfer efficiency; The casing physical strength is high, and the reaction medium physical strength the ground collapse phenomenon can not take place after descending.
Technical scheme of the present invention is achieved in that a kind of box baffling permeable reactive grid technology, is made up of reaction medium and medium box; It is characterized in that concrete steps are following: medium is packed in the medium box of rectangular parallelepiped in advance; Through putting to medium box; The permeable reactive grid is divided into 2-6 placed in-line reaction chamber, and the baffling fluidised form reaches the removal water pollutant through the PRB reactor drum being up and down to make current; Putting as follows of medium box wherein: upstream face the first layer medium box erection sequence is medium box A, a 1-6 medium box B respectively from top to bottom; Medium box C; Medium box A, a 1-6 concrete quantity of medium box B are by the decision of local waterbearing stratum thickness, medium box C respectively from down to up for second layer medium box erection sequence, and after this odd-level erection sequence is identical with the first layer, and the even level erection sequence is identical with the second layer; The medium box number of plies is relevant with the contaminated degree of local underground water, is generally the 2-6 layer.
Described medium box is made up of steel plate that scribbles impregnating material and steel mesh, steel plate thickness 3-5mm, and steel mesh mesh size is relevant with filling media particle size size.
Described medium box length is between 1.0～2.0m, and is wide between 0.5m～1.0m, high between 0.5m～1.5m.
Described medium box is divided into three kinds, difference called after A, B, C medium box, and A medium box front is that upstream face is a steel net structure, the back side is steel plate structure; The B medium box is positive, the back side is steel plate structure; The C medium box is positive, and A, B, C medium box all are not provided with top cover for steel plate structure, the back side are steel net structure, and the left and right side is steel plate structure, going to the bottom is steel net structure.
5cm place, described medium box bottom is the ring-type steel plate footing of 10cm along four inwall welding of medium box height, and medium box bottom steel mesh is fixed on ring-type steel plate footing upper edge.
Positively effect of the present invention:
(1) reaction medium is loaded, regenerates, is changed conveniently.When PRB is installed, directly being filled into reaction medium in the medium box; Especially when handling the underground water of the common pollution of multiple pollutent; Need to load multiple medium; At this moment can different media be filled in the different medium boxes, avoid not that different media is prone to take place the miscellaneous phenomenon among the conventional P RB when loading.When medium needs regeneration/replacing, can directly medium box be hung out through lifting rig, it is more convenient to dig reaction medium from the ground than conventional P RB.
(2) change the waterpower fluidised form, increase mass-transfer efficiency.Underground water is up and down during through box baffling PRB that baffling flows, and what can increase water pollutant and medium contacts the raising mass-transfer efficiency.
(3) the casing physical strength is high, and the reaction medium physical strength the ground collapse phenomenon can not take place after descending.
Description of drawings
Fig. 1 is a kind of box baffling PRB treatment technology system schematic.
Fig. 2 is a medium box A front view.
Fig. 3 is a medium box A vertical view.
Fig. 4 is a medium box A rear view.
Fig. 5 is a medium box B front view.
Fig. 6 is a medium box B vertical view.
Fig. 7 is a medium box B rear view.
Fig. 8 is a medium box C front view.
Fig. 9 is a medium box C vertical view.
Figure 10 is a medium box C rear view.
Illustration: 1, medium box A front steel mesh; 2, medium box footing; 3, medium box right flank sheet; 4, medium box left wing sheet; 5, medium box A bottom surface steel mesh; 6, medium box A back side steel plate; 7, medium box B front steel plate; 8, medium box B back side steel plate; 9, medium box B bottom surface steel mesh; 10, medium box C front steel plate; 11, medium box C bottom surface steel mesh; 12, medium box C back side steel mesh.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further description: shown in Fig. 1-10;A kind of box baffling permeable reactive grid technology is made up of reaction medium and medium box; It is characterized in that concrete steps are following: medium is packed in the medium box of rectangular parallelepiped in advance; Through putting to medium box; The permeable reactive grid is divided into 2-6 placed in-line reaction chamber, and the baffling fluidised form reaches the removal water pollutant through the PRB reactor drum being up and down to make current; Putting as follows of medium box wherein: upstream face the first layer medium box erection sequence is medium box A, a 1-6 medium box B respectively from top to bottom; Medium box C; Medium box A, a 1-6 concrete quantity of medium box B are by the decision of local waterbearing stratum thickness, medium box C respectively from down to up for second layer medium box erection sequence, and after this odd-level erection sequence is identical with the first layer, and the even level erection sequence is identical with the second layer; The medium box number of plies is relevant with the contaminated degree of local underground water, is generally the 2-6 layer.
Described medium box is made up of steel plate that scribbles impregnating material and steel mesh, steel plate thickness 3-5mm, and steel mesh mesh size is relevant with filling media particle size size.
Described medium box length is between 1.0～2.0m, and is wide between 0.5m～1.0m, high between 0.5m～1.5m.
Described medium box is divided into three kinds, difference called after A, B, C medium box, and A medium box front is that upstream face is a steel net structure, the back side is steel plate structure; The B medium box is positive, the back side is steel plate structure; The C medium box is positive, and A, B, C medium box all are not provided with top cover for steel plate structure, the back side are steel net structure, and the left and right side is steel plate structure, going to the bottom is steel net structure.
5cm place, described medium box bottom is the ring-type steel plate footing of 10cm along four inwall welding of medium box height, and medium box bottom steel mesh is fixed on ring-type steel plate footing upper edge.
Neighbouring medium box in installation process, last layer medium box footing 2 needs to embed and following one deck medium box top, is used to prevent that current from exosmosing through levels medium box junction; Fin 3,4 about when left and right sides adjacent media case is installed) is used to prevent that current from crossing adjacent media case junction, the left and right sides and producing short flow phenomenon; Contaminated underground water gets into A in the medium box from box baffling PRB the first layer medium box A front steel mesh 1 when using; Get into medium box B through medium box A bottom steel mesh 5 afterwards; Flow into medium box C (when n medium box B was set, then current had first to flow to n medium box B successively, get into medium box C at last) by medium box B bottom steel mesh 9 again; Get into second layer medium box A through medium box C back side steel mesh 12 afterwards; Current get into medium box C through medium box B from the bottom to top successively subsequently, are got among the 3rd layer of medium box A by second layer medium box C back side steel mesh again, and the flow-shape odd-level is identical with the first layer after this; Even level is identical with the second layer, and last current flow out through N layer medium box C back side steel mesh.
Embodiment 1
Latent layer water waterbearing stratum, somewhere thickness is 7.2m, mainly is made up of sand and sandy gravel, and all < 0.25mm is homogeneous aquifer to particle diameter.Groundwater velocity is 0.5m/>d, and water quality is that pH is 7.2, Cr (IV) concentration is that 0.821mg/L, PCBs (polychlorobiphenyl) concentration are 1.843mg/L.
According to this area's ground waterbearing stratum thickness and quality of groundwater; Adopt three layers of box baffling PRB technology that it is handled; Box baffling PRB is of a size of long 20m, wide 1.5m, high 7.5m, and the medium box specification is: long 2m, wide 0.5m, high 1.5m, and first and third layer vertically is provided with 5 medium boxes; Be respectively A, B, B, B, C from top to bottom, 20 medium boxes of arranged transversely; The second layer vertically is provided with 5 medium boxes, is respectively C, B, B, B, A from top to bottom, 20 medium boxes of arranged transversely; The first layer All Media case is all loaded the activated carbon granule of 0.5-1mm; Second and third layer All Media case is all filled out the zero-valent iron particle that particle diameter is 0.5-1mm; After system is stable; Treatment effect to Cr (IV) and PCBs is good, and average removal rate is respectively 92% and 95%, and effluent quality reaches quality of groundwater III standard.
Claims (5)
1. a box baffling permeable reactive grid technology is made up of reaction medium and medium box; It is characterized in that concrete steps are following: medium is packed in the medium box of rectangular parallelepiped in advance; Through putting to medium box; The permeable reactive grid is divided into 2-6 placed in-line reaction chamber, and the baffling fluidised form reaches the removal water pollutant through the PRB reactor drum being up and down to make current; Putting as follows of medium box wherein: upstream face the first layer medium box erection sequence is medium box A, a 1-6 medium box B respectively from top to bottom; Medium box C; Medium box A, a 1-6 concrete quantity of medium box B are by the decision of local waterbearing stratum thickness, medium box C respectively from down to up for second layer medium box erection sequence, and after this odd-level erection sequence is identical with the first layer, and the even level erection sequence is identical with the second layer; The medium box number of plies is relevant with the contaminated degree of local underground water, is generally the 2-6 layer.
2. a kind of box baffling permeable reactive grid technology according to claim 1 is characterized in that described medium box is made up of steel plate that scribbles impregnating material and steel mesh, steel plate thickness 3-5mm, and steel mesh mesh size is relevant with filling media particle size size.
3. a kind of box baffling permeable reactive grid technology according to claim 1 is characterized in that described medium box length between 1.0～2.0m, and is wide between 0.5m～1.0m, high between 0.5m～1.5m.
4. a kind of box baffling permeable reactive grid technology according to claim 1 is characterized in that described medium box is divided into three kinds, difference called after A, B, C medium box, and A medium box front is that upstream face is a steel net structure, the back side is steel plate structure; The B medium box is positive, the back side is steel plate structure; The C medium box is positive, and A, B, C medium box all are not provided with top cover for steel plate structure, the back side are steel net structure, and the left and right side is steel plate structure, going to the bottom is steel net structure.
5. a kind of box baffling permeable reactive grid technology according to claim 1; It is characterized in that 5cm place, described medium box bottom is the ring-type steel plate footing of 10cm along four inwall welding of medium box height, medium box bottom steel mesh is fixed on ring-type steel plate footing upper edge.
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Cited By (6)
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| CN105130137A (en) * | 2015-10-15 | 2015-12-09 | 中国地质大学（武汉） | In-situ repairing system and method for composite polluted groundwater |
| CN105414160A (en) * | 2015-12-18 | 2016-03-23 | 江苏维尔利环保科技股份有限公司 | Device and method for repairing hexavalent chromium-polluted groundwater by virtue of up-flow PRB technology |
| CN109179528A (en) * | 2018-09-29 | 2019-01-11 | 爱土工程环境科技有限公司 | A kind of construction method of permeable reactive barrier |
| CN109912045A (en) * | 2019-03-22 | 2019-06-21 | 河海大学 | A kind of permeable reactive barrier |
| CN113387468A (en) * | 2021-05-31 | 2021-09-14 | 轻工业环境保护研究所 | Assembled reaction box and layered composite permeable reaction wall |
| CN114735850A (en) * | 2022-04-08 | 2022-07-12 | 浙江大学 | Folding multilayer permeable reaction wall for in-situ purification of underground water pollution plume of refuse landfill |
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| CN105414160A (en) * | 2015-12-18 | 2016-03-23 | 江苏维尔利环保科技股份有限公司 | Device and method for repairing hexavalent chromium-polluted groundwater by virtue of up-flow PRB technology |
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| CN109179528A (en) * | 2018-09-29 | 2019-01-11 | 爱土工程环境科技有限公司 | A kind of construction method of permeable reactive barrier |
| CN109912045A (en) * | 2019-03-22 | 2019-06-21 | 河海大学 | A kind of permeable reactive barrier |
| CN109912045B (en) * | 2019-03-22 | 2021-08-27 | 河海大学 | Permeable reactive barrier |
| CN113387468A (en) * | 2021-05-31 | 2021-09-14 | 轻工业环境保护研究所 | Assembled reaction box and layered composite permeable reaction wall |
| CN114735850A (en) * | 2022-04-08 | 2022-07-12 | 浙江大学 | Folding multilayer permeable reaction wall for in-situ purification of underground water pollution plume of refuse landfill |
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Application publication date: 20120801 |