CN211948583U - Prevent normal position separation coiled material of pollutant diffusion - Google Patents
Prevent normal position separation coiled material of pollutant diffusion Download PDFInfo
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Abstract
The utility model discloses a prevent normal position separation coiled material of pollutant diffusion, include: the first non-woven geotextile layer, the first iron-based biochar layer, the second non-woven geotextile layer, the second iron-based biochar layer and the third non-woven geotextile layer are arranged from bottom to top in sequence; the first non-woven geotextile layer, the second non-woven geotextile layer and the third non-woven geotextile layer are fixedly connected through the needle-punched fibers. The utility model discloses an normal position separation coiled material has easy operation construction, practices thrift characteristics such as construction cost, can effectual normal position restore the heavy metal pollutant in soil, bed mud and the groundwater, can adapt to abominable construction and applied environment, has good application prospect.
Description
Technical Field
The utility model relates to a pollute soil, bed mud and groundwater repair engineering technical field, concretely relates to prevent normal position separation coiled material of pollutant diffusion.
Background
With the rapid development of economic society, the production activities and social behaviors of human beings bring certain influence on the natural environment. The production behaviors in the fields of mineral exploitation, metal smelting, chemical production and the like threaten the environments such as surrounding soil, bottom mud, river water and the like, heavy metal pollution is one of the environments, and the main pollution sources of the heavy metal pollution are waste water, waste residues and the like discharged from mining areas, smelting plants, electroplating plants, tanneries and pigment plants. Heavy metals contained in these pollutants can enter underground water through surface runoff, rainwater leaching and the like, and further pollute underground water resources available to human beings.
The problem of heavy metal pollution in soil, river sediment and the groundwater is solved to normal position restoration or dystopy restoration technique commonly used at present, but dystopy restoration technique is with high costs, easily causes secondary pollution, has certain limitation. Therefore, the method and the repair material which are time-saving, efficient, cheap, good in treatment effect, environment-friendly and the like are urgently needed to be explored, and the problem of heavy metal pollution migration and diffusion is solved. On the one hand, domestic methods for treating pollution of polluted soil, river sediment and underground water are more, and the methods mainly comprise physical control, chemical remediation, electric remediation technologies and the like. On the other hand, in the fields of municipal administration, water conservancy, refuse landfill, mines and the like, the sodium bentonite waterproof blanket is widely applied due to excellent seepage-proofing performance, simple processing, convenient construction and the like, while the common bentonite waterproof blanket has single function, can only play a good role in preventing water and seepage, and has weak capacity of preventing heavy metal pollution.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists in the above-mentioned problem, the utility model provides a prevent normal position separation coiled material of pollutant diffusion for the migration diffusion of normal position restoration heavy metal contaminated soil, bed mud and groundwater.
The utility model provides a prevent normal position separation coiled material of pollutant diffusion, include:
the first non-woven geotextile layer, the first iron-based biochar layer, the second non-woven geotextile layer, the second iron-based biochar layer and the third non-woven geotextile layer are arranged from bottom to top in sequence;
the first non-woven geotextile layer, the second non-woven geotextile layer and the third non-woven geotextile layer are fixedly connected through the needle-punched fibers.
As a further improvement of the present invention, the present invention further comprises: a sodium hexametaphosphate modified bentonite layer and a fourth non-woven geotextile layer;
the sodium hexametaphosphate modified bentonite layer and the fourth non-woven geotextile layer are arranged between the first non-woven geotextile layer and the first iron-based biochar layer, and the sodium hexametaphosphate modified bentonite layer is arranged between the first non-woven geotextile layer and the fourth non-woven geotextile layer;
the first non-woven geotextile layer, the second non-woven geotextile layer, the third non-woven geotextile layer and the fourth non-woven geotextile layer are fixedly connected through the needle-punched fibers.
As a further improvement of the present invention, the present invention further comprises: a third iron-based biochar layer and a fourth non-woven geotextile layer;
the third iron-based biochar layer and the fourth non-woven geotextile layer are arranged between the first non-woven geotextile layer and the first iron-based biochar layer, and the third iron-based biochar layer is arranged between the first non-woven geotextile layer and the fourth non-woven geotextile layer;
the first non-woven geotextile layer, the second non-woven geotextile layer, the third non-woven geotextile layer and the fourth non-woven geotextile layer are fixedly connected through the needle-punched fibers.
As a further improvement of the utility model, the first non-woven geotechnical cloth layer and the third non-woven geotechnical cloth layer are 200-230 g/m2The polypropylene filament non-woven geotextile.
As a further improvement of the utility model, the second non-woven geotechnical cloth layer and the fourth non-woven geotechnical cloth layer are 100-150 g/m2The polypropylene filament non-woven geotextile.
As a further improvement of the utility model, the sodium hexametaphosphate modified bentonite layer is 4800g/m2The sodium hexametaphosphate modified bentonite is used as an impermeable layer;
the mixing amount of sodium hexametaphosphate in the sodium hexametaphosphate modified bentonite is 3-5% of the mass of the bentonite, the particle size of the sodium hexametaphosphate modified bentonite is less than or equal to 0.15mm, and the permeability coefficient is less than or equal to 5 multiplied by 10-9m/s。
As a further improvement of the utility model, the tensile strength of the barrier coiled material is more than 600N/100mm, the elongation is more than 15%, and the peeling strength is more than 40N/100 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
the in-situ barrier coiled material of the utility model respectively and tightly fixes the heavy metal pollution prevention material and the anti-seepage material between the four layers of non-woven geotextiles by means of chemical, physical or biological modification, thereby not only having good heavy metal pollution prevention effect, but also having good anti-seepage performance; the utility model discloses the most important characteristic can be according to pollutant kind and prevention of seepage demand, selects the corresponding heavy metal pollution material layer of preventing, for example, if the pollution source uses hexavalent chromium as leading, just can select the reductant material that adds zero valence iron powder to reduce hexavalent chromium into the lower trivalent chromium of toxicity to adsorb on the great biomass charcoal particle surface of specific surface area. The barrier coiled material can be horizontally laid or vertically laid according to the piling state of the polluted soil and the bottom mud, and the barrier coiled material can play a role in blocking the migration and diffusion of heavy metal pollutants;
the utility model discloses an normal position separation coiled material has easy operation construction, practices thrift characteristics such as construction cost, can effectual normal position restore the heavy metal pollutant in soil, bed mud and the groundwater, can adapt to abominable construction and applied environment, has good application prospect.
Drawings
Fig. 1 is a schematic structural view of an in-situ blocking coiled material according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an in-situ barrier roll according to another embodiment of the present invention;
fig. 3 is a schematic structural view of an in-situ barrier roll according to another embodiment of the present invention;
fig. 4 is a schematic view of a vertical laying structure of an in-situ blocking coiled material according to an embodiment of the present invention.
In the figure:
1. a first nonwoven geotextile layer; 2. a first iron-based biochar layer; 3. a second non-woven geotextile layer; 4. a second iron-based biochar layer; 5. a third non-woven geotextile layer; 6. needling the fibers; 7. sodium hexametaphosphate modifies the bentonite layer; 8. a fourth non-woven geotextile layer; 9. a third iron-based biochar layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the accompanying drawings:
based on the research that has the problem among the background art, through the excellent shortcoming of the various repair techniques of contrast and repair materials, the utility model discloses a suitable chemistry, physics or biological modification means, reform transform into the environmental mineral material that the particle diameter is little, specific surface area is big, the porosity is high and have the normal position separation coiled material of better ion exchange performance to provide convenient preparation method and the construction method of separation coiled material, be used for the normal position level or the vertical separation of heavy metal contaminated soil, bed mud and groundwater.
Specifically, the method comprises the following steps:
as shown in fig. 1, the utility model provides a prevent normal position separation coiled material of pollutant diffusion, include:
the first non-woven geotextile layer 1, the first iron-based biochar layer 2, the second non-woven geotextile layer 3, the second iron-based biochar layer 4 and the third non-woven geotextile layer 5 are arranged from bottom to top in sequence;
the first non-woven geotextile layer 1, the second non-woven geotextile layer 3 and the third non-woven geotextile layer 5 are fixedly connected through the needle-punched fibers 6, and the first iron-based biochar layer 2 and the second iron-based biochar layer 4 are fixed between the two non-woven geotextile layers, so that all the layers are connected and fixed together.
Wherein, the first iron-based biochar layer 2 and the second iron-based biochar layer 4 are used as heavy metal pollutant diffusion prevention layers.
As shown in fig. 2, the utility model provides a prevent normal position separation coiled material of pollutant diffusion, include:
a first non-woven geotextile layer 1, a sodium hexametaphosphate modified bentonite layer 7, a fourth non-woven geotextile layer 8, a first iron-based biochar layer 2, a second non-woven geotextile layer 3, a second iron-based biochar layer 4 and a third non-woven geotextile layer 5 are arranged from bottom to top in sequence;
the first non-woven geotextile layer 1, the second non-woven geotextile layer 3, the third non-woven geotextile layer 5 and the fourth non-woven geotextile layer 8 are fixedly connected through the needle-punched fibers 6, and the first iron-based biochar layer 2, the sodium hexametaphosphate modified bentonite layer 7 and the second iron-based biochar layer 4 are fixed between the two non-woven geotextile layers, so that all layers are connected and fixed together.
The first iron-based biochar layer 2 and the second iron-based biochar layer 4 are used as heavy metal pollutant diffusion prevention layers, and the sodium hexametaphosphate modified bentonite 7 is used as an anti-seepage layer.
As shown in fig. 3, the utility model provides a prevent normal position separation coiled material of pollutant diffusion, include:
a first non-woven geotextile layer 1, a third iron-based biochar layer 9, a fourth non-woven geotextile layer 8, a first iron-based biochar layer 2, a second non-woven geotextile layer 3, a second iron-based biochar layer 4 and a third non-woven geotextile layer 5 are arranged from bottom to top in sequence;
the first non-woven geotextile layer 1, the second non-woven geotextile layer 3, the third non-woven geotextile layer 5 and the fourth non-woven geotextile layer 8 are fixedly connected through the needle-punched fibers 6, and the first iron-based biochar layer 2, the third iron-based biochar layer 9 and the second iron-based biochar layer 4 are fixed between the two non-woven geotextile layers, so that all the layers are connected and fixed together.
Wherein, the first iron-based biochar layer 2, the second iron-based biochar layer 4 and the third iron-based biochar layer 9 are used as heavy metal pollutant diffusion prevention layers.
Further, in the three configurations of in situ barrier webs shown in fig. 1, 2, and 3 described above:
the first non-woven geotextile layer 1 and the third non-woven geotextile layer 5 are 200-230 g/m2The polypropylene filament non-woven geotextile, the second non-woven geotextile layer 3 and the fourth non-woven geotextile layer 8 are 100-150 g/m2The polypropylene filament non-woven geotextile.
The sodium hexametaphosphate modified bentonite layer 7 is prepared from 4800g/m2The sodium hexametaphosphate modified bentonite is prepared from 3-5% of sodium hexametaphosphate in the sodium hexametaphosphate modified bentonite, the particle size of the sodium hexametaphosphate modified bentonite is less than or equal to 0.15mm, and the permeability coefficient is less than or equal to 5 multiplied by 10-9m/s。
The preparation method of the iron-based biochar of the first iron-based biochar layer 2, the second iron-based biochar layer 4 and the third iron-based biochar layer 9 comprises the following steps:
one or more biomasses of roots, stems and leaves of woody plants are taken as raw materials, and one or more iron-containing compounds of zero-valent iron powder, ferrous sulfate or ferric sulfate are added, so that the mass percentage of carbon to iron is (20-50): 1; adding a sodium borohydride reducing agent solution which accounts for 1-10% of the total mass of the biomass raw material and the iron compound, and carbonizing at the high temperature of 300-800 ℃ to form the biomass material with the specific surface area of 80-150 g/m2The iron-based biochar.
The in-situ barrier coiled material with three structures shown in the figure 1, the figure 2 and the figure 3 of the utility model has the tensile strength of more than 600N/100mm, the elongation of more than 15 percent and the peeling strength of more than 40N/100 mm.
The utility model provides a preparation method of normal position separation coiled material that figure 1 shows, include:
laying a first iron-based biochar layer 2 on the first non-woven geotextile layer 1;
laying a second non-woven geotextile layer 3 on the first iron-based biochar layer 2;
laying a second iron-based biochar layer 4 on the second non-woven geotextile layer 3;
laying a third non-woven geotextile layer 5 on the second iron-based biochar layer 4;
the first, second and third nonwoven geotextile layers 1, 3 and 5 are fixed by the needle-punched fibers 6.
The utility model provides a preparation method of normal position separation coiled material that figure 2 shows, include:
laying a sodium hexametaphosphate modified bentonite layer 7 on the first non-woven geotextile layer 1;
laying a fourth non-woven geotextile layer 8 on the sodium hexametaphosphate modified bentonite layer 7;
laying a first iron-based biochar layer 2 on the fourth non-woven geotextile layer 8;
laying a second non-woven geotextile layer 3 on the first iron-based biochar layer 2;
laying a second iron-based biochar layer 4 on the second non-woven geotextile layer 3;
laying a third non-woven geotextile layer 5 on the second iron-based biochar layer 4;
the first non-woven geotextile layer 1, the second non-woven geotextile layer 3, the third non-woven geotextile layer 5, and the fourth non-woven geotextile layer 8 are fixed by the needle-punched fibers 6.
The utility model provides a preparation method of normal position separation coiled material that figure 3 shows, include:
laying a third iron-based biochar layer 9 on the first non-woven geotextile layer 1;
laying a fourth non-woven geotextile layer 8 on the third iron-based biochar layer 9;
laying a first iron-based biochar layer 2 on the fourth non-woven geotextile layer 8;
laying a second non-woven geotextile layer 3 on the first iron-based biochar layer 2;
laying a second iron-based biochar layer 4 on the second non-woven geotextile layer 3;
laying a third non-woven geotextile layer 5 on the second iron-based biochar layer 4;
the first non-woven geotextile layer 1, the second non-woven geotextile layer 3, the third non-woven geotextile layer 5, and the fourth non-woven geotextile layer 8 are fixed by the needle-punched fibers 6.
The utility model provides a construction method of normal position separation coiled material, include:
the in-situ blocking coiled material is vertically paved at the downstream of the groundwater flow of the polluted site to block and remove the migration of the heavy metal pollutants in the groundwater; the vertical laying mode is shown in figure 4;
the in-situ blocking coiled material is horizontally laid on the upper layer of the polluted soil or the polluted bottom mud, and the migration of pollutants in the soil or the heavy metal percolate of the bottom mud is blocked and removed; the horizontal lay is shown in figures 1, 2 or 3.
The construction method comprises the following steps: the method comprises the steps of measuring the actual dimension of a polluted area, laying and planning, tamping a base layer (horizontal laying) or excavating a groove (vertical laying), producing and processing the barrier coiled material, laying the barrier coiled material, processing the seam of the barrier coiled material, checking and accepting, covering and the like.
The method specifically comprises the following steps:
A. the base layer to be laid is inspected before horizontal laying construction, the base layer is flat and free of accumulated water in pits, stone tree roots and other sharp objects; before vertical laying construction, a groove is dug through grooving equipment, and the laid separation coiled material needs to be clean and free of damage.
B. When the barrier coiled material is vertically laid, the barrier coiled material is safely anchored, then the coiled material is put down along the slope, the stretched coiled material is kept in a tight state, and the position of the stretched coiled material is adjusted to reduce wrinkles on the surface of the material. The connection of the barrier coiled materials adopts a lap joint mode, and both ends of the barrier coiled materials are mechanically anchored. When the barrier coiled material is horizontally laid, the barrier coiled material is naturally loosened when unfolded, and is tightly attached to the supporting layer and cannot be folded or suspended.
C. The connection of the blocking coiled materials adopts a lap joint mode, the lap joint width is 250 +/-50 mm, lap joints are tightly attached and leveled, folding is strictly prohibited, a layer of bulk iron-based biochar particles are uniformly sprayed in a lap joint area, and the using amount of the iron-based biochar particles is not less than 1Kg/m or bentonite waterproof slurry is used for sealing the lap joints.
D. After the installation is finished, the barrier coiled material on the whole pavement surface needs to be checked and accepted to ensure that the paved barrier coiled material for preventing the diffusion of pollutants does not leak.
The utility model relates to a prevent normal position separation coiled material of pollutant diffusion through chemistry, physics or biological modification means, will prevent that heavy metal pollution material, barrier material from fixing respectively closely between four layers of non-woven geotechnological cloth, not only play good prevent heavy metal pollution effect, also have good prevention of seepage performance. The utility model discloses the most important characteristic can be according to pollutant kind and prevention of seepage demand, selects the corresponding heavy metal pollution material layer of preventing, for example, if the pollution source uses hexavalent chromium as leading, just can select the reductant material that adds zero valence iron powder to reduce hexavalent chromium into the lower trivalent chromium of toxicity to adsorb on the great biomass charcoal particle surface of specific surface area. And barrier coiled materials can be horizontally laid or vertically laid according to the stacking state of the polluted soil and the bottom mud, and the barrier coiled materials can play a role in blocking migration and diffusion of heavy metal pollutants. Adopt many times the acupuncture shaping with ordinary compound geotechnological blanket to compare, the utility model discloses separation coiled material acupuncture one-time shaping, preparation and construction method are simple and convenient, and mechanical parameter is excellent, and its tensile strength is greater than 600N 100mm, the elongation is greater than 15%, peel strength is greater than 40N 100 mm. The utility model has the characteristics of process flow is simple, and easy operation construction practices thrift construction cost etc, can effectual normal position restore the heavy metal pollutant in soil, bed mud and the groundwater, can adapt to abominable construction and applied environment, has good application prospect.
Example 1:
taking a river bottom mud remediation project polluted by certain heavy metal as an example, the river is really a sewage receiving river, 6 large-scale sulfuric acid plants and monoammonium phosphate chemical plant production enterprises exist in the upstream of the river, and because environmental protection facilities are not sound, a large amount of discharged industrial wastewater enters the river and is accumulated for a long time, the river bottom mud is seriously polluted by the heavy metal. The overproof rate of arsenic in the bottom mud is 91 percent, the highest content reaches 3800mg/kg and exceeds 126 times; the cadmium content in the bottom mud exceeds the standard by 66 percent, the maximum content reaches 56.2mg/kg, and exceeds the standard by 56 times; the exceeding rate of zinc in the bottom mud is 60 percent, the highest content reaches 2650mg/kg, and the exceeding rate is 5.3 times; the excessive copper rate in the bottom mud is 25 percent, and the maximum content reaches 2300mg/kg, which is 5.7 times of the excessive copper rate.
The specific implementation steps are as follows:
the in-situ barrier coiled material for preventing the diffusion of pollutants is horizontally laid in a barrier landfill area after dredging. Carrying out desilting on polluted bottom mud in the river channel through cofferdam closure, and carrying out gravity dehydration and sealing storage on the bottom mud subjected to desilting by transferring the bottom mud to a separation coiled material. The length 580m, the width 60m and the thickness 11.5cm of the blocking coiled material enable the dehydrated bottom mud percolate to react with the heavy metal pollutant diffusion prevention layer in the blocking coiled material and then be discharged.
The in-situ barrier coiled material for preventing pollutant diffusion and the construction method thereof provided by the embodiment comprise the following steps:
the in situ barrier web of this embodiment is selected from the in situ barrier web configuration shown in figure 3.
The method for manufacturing the in-situ barrier web of this embodiment selects the method for manufacturing the in-situ barrier web as shown in fig. 3.
Further, the first and third nonwoven geotextile layers 1 and 5 of this example are 200g/m2The polypropylene filament non-woven geotextile of (1), the second non-woven geotextile layer 3 and the fourth non-woven geotextile layer 8 are 130g/m2The polypropylene filament non-woven geotextile.
Further, the preparation method of the iron-based biochar used in the first iron-based biochar layer 2, the second iron-based biochar layer 4, and the third iron-based biochar layer 9 of this embodiment is: the iron-based biochar takes reed as a raw material, and is added into ferrous sulfate and ferric sulfate, so that the mass percentage of carbon to iron is 38: 1, adding 6 percent by mass of sodium borohydride reducing agent solution, and carbonizing at the high temperature of 700 ℃ to form the nano-composite material with the specific surface area of 90g/m2The iron-based biochar material.
Further, in the practice of this example, the barrier web had a tensile strength greater than 600N/100mm, an elongation greater than 15%, and a peel strength greater than 40N/100 mm.
The construction method of the in-situ barrier coiled material of the embodiment comprises the following steps:
A. the basic unit that will lay should be examined before the horizontal laying construction, and the basic unit should be leveled, no pothole ponding, no stone tree root and other sharp thing, and the separation coiled material is transported to the job site and is laid after the processing of mill is accomplished, and the separation coiled material must be clean and tidy undamaged.
B. When the side slope around the separation landfill area is paved, the separation coiled material is safely anchored, then the coiled material is put down along the slope, the tension state of the unfolded coiled material is kept, and the position of the unfolded coiled material is adjusted to reduce wrinkles on the surface of the material. The connection of the barrier coiled materials adopts a lap joint mode, and both ends of the barrier coiled materials are mechanically anchored. When the barrier coiled material is horizontally laid, the barrier coiled material is naturally loosened when unfolded, and is tightly attached to the supporting layer and cannot be folded or suspended.
C. The connection of the blocking coiled materials adopts a lap joint mode, the lap joint width is 250 +/-50 mm, lap joints are tightly attached and flat, folding is strictly prohibited, a layer of bulk iron-based biochar particles is uniformly sprayed in a lap joint area to seal the lap joints, and the using amount of the iron-based biochar particles is not less than 1 Kg/m.
D. After the installation is finished, the barrier coiled material on the whole pavement surface needs to be checked and accepted to ensure that the paved barrier coiled material for preventing the diffusion of pollutants does not leak.
E. After all the polluted bottom mud is buried, sealing and storing the surface layer by using the barrier coiled material, covering nutrient soil after sealing and storing, and greening the turf.
The result of regularly tracking and monitoring the bottom sludge percolate passing through the barrier coiled material shows pH and Chemical Oxygen Demand (COD)Cr) And the five-day biochemical oxygen demand, ammonia nitrogen, arsenic, cadmium, zinc and copper all meet the highest allowable discharge concentration of the integrated wastewater discharge standard (GB8978-1996) in the project, and the leachate which reaches the standard is discharged by a nano tube regularly.
Example 2:
taking a soil pollution remediation project of a certain abandoned mine site as an example, a large amount of heavy metal tailing slag is left in the abandoned mine to be stacked in the open air, water and soil are seriously lost, a large amount of tailings are washed by rainwater to block river channels, peripheral farmlands are polluted, the contents of nickel, vanadium, chromium and copper in the abandoned mine slag are respectively 81.8%, 27.3%, 18.2% and 9.1% of standard exceeding rate compared with a three-level standard value of soil environment quality standard (GB15618-1995), the maximum standard exceeding times are respectively 4.6, 5.4, 0.93 and 0.03, and the heavy metal polluted slag seriously affects local drinking water sources and agricultural production and threatens human health.
The specific implementation steps are as follows:
another in-situ blocking coiled material for preventing the diffusion of pollutants is vertically laid at the downstream of the waste slag, and a slag blocking dam is arranged for fixing a river bed, blocking the slag and supporting. The blocking coiled material is arranged at the position, perpendicular to the slag migration path, of the inner side of the slag blocking dam and perpendicular to underground water flow. The length 736m, the width 11.5cm and the height 5.5m of separation coiled material guarantee that whole slay pollutes the pinnate body and can both pass through, make a small amount of filtration liquid in the slay heap react with the diffusion layer of preventing heavy metal pollutant in the separation coiled material in the back through the outlet discharge.
The in-situ barrier coiled material for preventing pollutant diffusion and the construction method thereof provided by the embodiment comprise the following steps:
the in situ barrier web of this embodiment is selected from the in situ barrier web configuration shown in figure 2.
The method for manufacturing the in-situ barrier web of this embodiment selects the method for manufacturing the in-situ barrier web as shown in fig. 2.
Further, the first and third nonwoven geotextile layers 1 and 5 of this example are 230g/m2The polypropylene filament non-woven geotextile, the second non-woven geotextile layer 3 and the fourth non-woven geotextile layer 8 are 150g/m2The polypropylene filament non-woven geotextile.
Further, the preparation method of the iron-based biochar used in the first iron-based biochar layer 2 and the second iron-based biochar layer 4 of the embodiment is as follows: the iron-based biochar takes palm as a raw material, and zero-valent iron powder and ferrous sulfate are added to ensure that the mass percentage of carbon to iron is 40: 1, adding 70 percent by mass of sodium borohydride reducing agent solution, and carbonizing at the high temperature of 600 ℃ to form the nano-composite material with the specific surface area of 130g/m2The iron-based biochar material.
Further, the embodimentThe sodium hexametaphosphate modified bentonite layer 7 is prepared from 4800g/m2The sodium hexametaphosphate modified bentonite is prepared by mixing the sodium hexametaphosphate in the sodium hexametaphosphate modified bentonite in an amount of 4 percent of the mass of the bentonite, wherein the particle size of the sodium hexametaphosphate modified bentonite is less than or equal to 0.15mm, and the permeability coefficient is less than or equal to 5 multiplied by 10-9m/s。
Further, in the practice of this example, the barrier web had a tensile strength greater than 600N/100mm, an elongation greater than 15%, and a peel strength greater than 40N/100 mm.
The construction method of the in-situ barrier coiled material of the embodiment comprises the following steps:
A. the groove is dug through grooving equipment before the construction is laid perpendicularly, and the separation coiled material is transported to the job site and laid after the factory processing is finished, and the separation coiled material must be clean and tidy and have no damage.
B. When the barrier coiled material is vertically paved, the barrier coiled material is safely anchored on the slope surface of the masonry stone slag dam, then the coiled material is put down along the surface of the slag dam, the tightening state of the unfolded coiled material is kept, and the position of the unfolded coiled material is adjusted to reduce wrinkles on the surface of the material. The connection of the barrier coiled materials adopts a lap joint mode, and both ends of the barrier coiled materials are mechanically anchored.
C. The connection of the blocking coiled materials adopts a lap joint mode, the lap joint width is 250 +/-50 mm, lap joints are tightly attached and leveled, folding is strictly prohibited, a layer of bulk iron-based biochar particles are uniformly sprayed in a lap joint area, and the using amount of the iron-based biochar particles is not less than 1Kg/m or bentonite waterproof slurry is used for sealing the lap joints.
D. After the installation is finished, the barrier coiled material on the whole pavement surface needs to be checked and accepted to ensure that the paved barrier coiled material for preventing the diffusion of pollutants does not leak.
The pH value and the Chemical Oxygen Demand (COD) of the detected water sample are obtained by tracking and sampling the water outlet of the blocking coiled material slag dam in the later periodCr) And the five-day biochemical oxygen demand, ammonia nitrogen, nickel, vanadium, copper and chromium all meet the standards of 'surface water environment quality standards' (GB3838-2002) (class III) and meet the standards of 'underground water quality standards' (GB14848-93) (class III).
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An in situ barrier web for preventing diffusion of contaminants, comprising:
the first non-woven geotextile layer, the first iron-based biochar layer, the second non-woven geotextile layer, the second iron-based biochar layer and the third non-woven geotextile layer are arranged from bottom to top in sequence;
the first non-woven geotextile layer, the second non-woven geotextile layer and the third non-woven geotextile layer are fixedly connected through the needle-punched fibers.
2. The in situ barrier web of claim 1, further comprising: a sodium hexametaphosphate modified bentonite layer and a fourth non-woven geotextile layer;
the sodium hexametaphosphate modified bentonite layer and the fourth non-woven geotextile layer are arranged between the first non-woven geotextile layer and the first iron-based biochar layer, and the sodium hexametaphosphate modified bentonite layer is arranged between the first non-woven geotextile layer and the fourth non-woven geotextile layer;
the first non-woven geotextile layer, the second non-woven geotextile layer, the third non-woven geotextile layer and the fourth non-woven geotextile layer are fixedly connected through the needle-punched fibers.
3. The in situ barrier web of claim 1, further comprising: a third iron-based biochar layer and a fourth non-woven geotextile layer;
the third iron-based biochar layer and the fourth non-woven geotextile layer are arranged between the first non-woven geotextile layer and the first iron-based biochar layer, and the third iron-based biochar layer is arranged between the first non-woven geotextile layer and the fourth non-woven geotextile layer;
the first non-woven geotextile layer, the second non-woven geotextile layer, the third non-woven geotextile layer and the fourth non-woven geotextile layer are fixedly connected through the needle-punched fibers.
4. The in-situ barrier roll of any one of claims 1 to 3, wherein the first and third nonwoven geotextile layers are 200 to 230g/m2The polypropylene filament non-woven geotextile.
5. The in-situ barrier web as claimed in any one of claims 2 to 3, wherein the second and fourth non-woven geotextile layers are 100 to 150g/m2The polypropylene filament non-woven geotextile.
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| CN110607808A (en) * | 2019-10-16 | 2019-12-24 | 北京高能时代环境技术股份有限公司 | In-situ barrier coiled material for preventing pollutant from diffusing, preparation method and construction method |
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| CN110607808A (en) * | 2019-10-16 | 2019-12-24 | 北京高能时代环境技术股份有限公司 | In-situ barrier coiled material for preventing pollutant from diffusing, preparation method and construction method |
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