CN212612660U - Hazardous waste landfill system - Google Patents
Hazardous waste landfill system Download PDFInfo
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- CN212612660U CN212612660U CN202021868667.0U CN202021868667U CN212612660U CN 212612660 U CN212612660 U CN 212612660U CN 202021868667 U CN202021868667 U CN 202021868667U CN 212612660 U CN212612660 U CN 212612660U
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Abstract
The utility model provides a hazardous waste landfill system, which comprises a landfill unit, an anti-seepage unit and a discharge platform, wherein the landfill unit comprises a plurality of landfill areas, the anti-seepage unit is arranged on the landfill areas, and the anti-seepage unit comprises an anti-seepage layer and an anti-seepage protective layer; a plurality of landfill district is arranged along relief eminence toward relief low in proper order, and the edge of the highest landfill district of relief is equipped with satisfies initial landfill operation the platform of unloading to begin to hoist dangerous waste ton bag from the highest landfill district of relief and put, make dangerous waste ton bag form interim road and unload the platform and be connected. The utility model discloses set up the prevention of seepage protective layer and avoid the barrier layer to be destroyed, the landfill method is through carrying out solidification treatment to dangerous waste and landfill again, reduces filtration liquid production, and initial landfill adopts the crane to hang on the platform of unloading to put and is equipped with the interim road of leaving of dangerous waste ton bag formation and satisfies subsequent transportation and landfill operation, cancels the road of leaving the country in order to avoid the barrier layer to be destroyed and increase the landfill storage capacity simultaneously.
Description
Technical Field
The utility model relates to a wastes material landfill technical field especially relates to a hazardous waste landfill system.
Background
In recent years, along with the rapid development of economy in China, a large amount of waste is generated and needs to be treated, particularly, the treatment work of hazardous waste is gradually paid attention by the industry, and the landfill technology is the most common hazardous waste treatment method at present and is one of more ideal treatment methods for the final treatment of the hazardous waste due to the characteristics of large treatment capacity, strong applicability and the like.
At present, in the existing hazardous waste landfill technology, a landfill unit is generally not partitioned or is few in partitions, and is not covered in time in the landfill process, so that sewage disposal and diversion cannot be realized, and rainwater is easy to directly enter hazardous waste to form percolate; the seepage-proofing units are basically arranged according to standard specifications, and because the protective layer is not sufficiently or inadequately arranged, the geomembrane layer is easy to damage in actual construction or/and landfill use, so that percolate in a landfill area leaks into soil to pollute the surrounding environment; in order to meet the requirement of the field bottom landfill operation of the landfill area, a permanent off-site road is usually considered to be arranged in the landfill area, so that the storage capacity is occupied, and the risk of damaging the anti-seepage unit is increased. In addition, the existing dangerous waste is directly loaded to a landfill area for landfill without being treated, and besides secondary pollution is caused by easy loss in the transportation process, the dangerous waste contains higher water content, numerous active harmful heavy metals and salts, so that the infiltration liquid amount is large and a percolate collection system is blocked, the safety of the landfill area is threatened due to poor stability of a dangerous waste pile body, and meanwhile, the harmful heavy metals are enriched in the percolate, so that the subsequent treatment difficulty and high cost are caused, and the environmental pollution risk of heavy metal migration is increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hazardous waste landfill system solves secondary pollution and the landfill in-process waste heap body safety, the leachate drainage of hazardous waste transportation in current landfill system and the landfill method and leads the problem that easily becomes silted up stifled, prevention of seepage unit destruction.
The utility model provides a hazardous waste landfill system, including landfill unit, prevention of seepage unit and platform of unloading, the landfill unit includes a plurality of landfill district, the prevention of seepage unit sets up on the landfill district, the prevention of seepage unit includes barrier layer and the prevention of seepage protective layer that stacks gradually from inside to outside;
a plurality of the landfill district is arranged along relief eminence toward relief low place in proper order, and the relief is the highest the edge of landfill district is equipped with satisfies initial landfill operation the platform of unloading is highest with dangerous waste ton bag follow the relief the landfill district begins to hang and puts, so that dangerous waste ton bag forms temporary road with the platform of unloading is connected, dangerous waste ton bag is formed by dangerous waste solidification bagging-off.
According to the utility model provides a hazardous waste landfill system has following beneficial effect: the impermeable protective layer arranged on the landfill area can effectively protect the impermeable layer from being damaged and guide and discharge the percolate to flow into the percolate guide and discharge system arranged at the bottom of the landfill area, thereby preventing the soil around the landfill unit from being polluted by the percolate. And a dangerous waste ton bag filled with the dangerous waste solidified body is hoisted on the unloading platform by adopting a crane to form a temporary off-site road so as to meet the subsequent transportation and landfill operation of the dangerous waste solidified body, the off-site road is cancelled, the landfill capacity is increased, and meanwhile, the impermeable layer is further prevented from being damaged.
In addition, according to the utility model provides a hazardous waste landfill system can also have following additional technical characterstic:
furthermore, the landfill region is surrounded by a landfill region field bottom and a landfill region side slope extending upwards from the landfill region field bottom;
the anti-seepage protective layer comprises a first anti-seepage protective layer and a second anti-seepage protective layer, wherein the first anti-seepage protective layer is arranged on the side slope of the landfill area and comprises a first geotextile layer and a bagged sand layer which are stacked from inside to outside;
the second anti-seepage protective layer is arranged on the bottom of the landfill area and comprises a second geotechnical cloth layer, a geotechnical composite drainage mesh layer and a geotechnical mat cushion layer which are stacked from bottom to top;
the first geotextile layer and the second geotextile layer are integrally connected.
Further, the hazardous waste landfill system also comprises an anchoring platform, wherein the discharging platform is arranged on the anchoring platform, and the impermeable layer and the edge end of the first geotextile layer are fixed on the anchoring platform.
Further, the hazardous waste landfill system further comprises a temporary covering unit, and the edge end of the temporary covering unit is fixed on the anchoring platform by adopting a weight pressing mode or an expansion screw so as to temporarily cover the landfill area.
Further, the temporary covering unit is a high-density polyethylene geomembrane, and the thickness of the temporary covering unit is 0.75-1.0 mm.
The utility model also provides a hazardous waste landfill method, use in above-mentioned hazardous waste landfill system, hazardous waste landfill method includes following step:
the hazardous waste landfill method comprises the following steps:
dividing a landfill unit into a plurality of landfill areas, paving an impermeable layer on each landfill area side slope and the field bottom, and paving an impermeable protective layer on the impermeable layer to form an impermeable unit;
a plurality of the landfill district is arranged toward the low department of relief along relief eminence in proper order, and the relief is the highest the edge of landfill district is equipped with the platform of unloading that satisfies initial landfill operation, forms hazardous waste solidification bagging-off hazardous waste ton bag adopt the crane will on the platform of unloading hazardous waste ton bag is hung and is put to lieing in the relief the highest form interim road connection platform of unloading of leaving the court in the landfill district, in order to satisfy the follow-up transportation and the landfill operation of hazardous waste ton bag.
Further, the hazardous waste landfill method specifically comprises the following steps:
dividing a landfill unit into a plurality of landfill areas, wherein the landfill areas are sequentially arranged from high to low according to terrain, the edge of the landfill area with the highest terrain is provided with a discharge platform meeting initial landfill operation, and impermeable layers are paved on the side slopes and the bottom of each landfill area;
sequentially laying a first geotechnical cloth layer and a bagged sand layer on an impermeable layer of the side slope of the landfill area to form a first impermeable protective layer, sequentially laying a second geotechnical cloth layer, a geotechnical composite drainage net layer and a geotechnical mat cushion layer on the impermeable layer at the bottom of the landfill area to form a second impermeable protective layer, and integrally connecting the first geotechnical cloth layer and the second geotechnical cloth layer;
fixing the edge ends of the impermeable layer and the first geotextile layer on an anchoring platform;
after each landfill area is built, covering a temporary covering unit on the upper opening, and fixing the edge end of the temporary covering unit on the anchoring platform in a weight pressing mode or an expansion screw;
uncovering the temporary covering unit, and hoisting the hazardous waste ton bags to the landfill area with the highest terrain by adopting a crane on the unloading platform to form a temporary unloading platform connected with roads to meet the subsequent transportation and landfill operation of the hazardous waste ton bags, wherein the landfill sequence is that landfill is carried out sequentially from high to low according to the terrain of the landfill area;
and after the landfill is finished, covering by adopting the temporary covering unit.
According to the utility model provides a hazardous waste landfill method has following beneficial effect: firstly, stabilizing and solidifying the hazardous waste into a hazardous waste solidified body and bagging the hazardous waste solidified body, so that the hazardous waste materials are organized and transported, and a reinforcement and stabilization effect can be exerted on a hazardous material pile body, secondary pollution in the transportation process can be avoided, the percolate generation amount in the landfill process is reduced, and the clogging time of a percolate collecting system is delayed; the discharging platform is arranged at the edge of the landfill area with the highest terrain, and the dangerous waste ton bag filled with the dangerous waste solidified body is hoisted on the discharging platform by a crane in initial landfill to form a temporary off-site road so as to meet the subsequent transportation and landfill operation of the dangerous waste solidified body, so that the landfill capacity can be increased, and the impermeable layer can be prevented from being damaged.
Further, the preparation method of the dangerous ton bag comprises the following steps: adding a fixing agent, a stabilizing agent and water into the hazardous waste, stirring to form a hazardous waste solidified body, and bagging the hazardous waste solidified body to form a hazardous waste ton bag.
Further, the fixing agent is cement, lime or fly ash, and the stabilizing agent is sodium thiosulfate or a metal chelating agent.
Further, the hazardous waste landfill method specifically comprises the following steps:
dividing a landfill unit into a plurality of landfill areas, wherein the landfill areas are sequentially arranged from high to low according to terrain, the edge of the landfill area with the highest terrain is provided with a discharge platform meeting initial landfill operation, and impermeable layers are paved on the side slopes and the bottom of each landfill area;
sequentially laying a first geotechnical cloth layer and a bagged sand layer on an impermeable layer of the side slope of the landfill area to form a first impermeable protective layer, sequentially laying a second geotechnical cloth layer, a geotechnical composite drainage net layer and a geotechnical mat cushion layer on the impermeable layer at the bottom of the landfill area to form a second impermeable protective layer, and integrally connecting the first geotechnical cloth layer and the second geotechnical cloth layer;
fixing the edge ends of the impermeable layer and the first geotextile layer on an anchoring platform;
after each landfill area is built, covering a temporary covering unit on the upper opening, and fixing the edge end of the temporary covering unit on the anchoring platform in a weight pressing mode or an expansion screw;
uncovering the temporary covering unit, and hoisting the hazardous waste ton bags to the landfill area with the highest terrain by adopting a crane on the unloading platform to form a temporary unloading platform connected with roads to meet the subsequent transportation and landfill operation of the hazardous waste ton bags, wherein the landfill sequence is that landfill is carried out sequentially from high to low according to the terrain of the landfill area;
and after the landfill is finished, covering by adopting the temporary covering unit.
According to the utility model provides a hazardous waste landfill method has following beneficial effect: firstly, stabilizing and solidifying the hazardous waste into a hazardous waste solidified body and bagging the hazardous waste solidified body, so that the hazardous waste materials are organized and transported, and a reinforcement and stabilization effect can be exerted on a hazardous material pile body, secondary pollution in the transportation process can be avoided, the percolate generation amount in the landfill process is reduced, and the clogging time of a percolate collecting system is delayed; the discharging platform is arranged at the edge of the landfill area with the highest terrain, and the dangerous waste ton bag filled with the dangerous waste solidified body is hoisted on the discharging platform by a crane in initial landfill to form a temporary off-site road so as to meet the subsequent transportation and landfill operation of the dangerous waste solidified body, so that the landfill capacity can be increased, and the impermeable layer can be prevented from being damaged.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
figure 1 is a top plan view of a hazardous waste landfill system of a first embodiment of the invention;
fig. 2 is a longitudinal sectional view of a hazardous waste landfill system of a first embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a landfill area of a hazardous waste landfill system according to a first embodiment of the present invention;
fig. 4 is a schematic structural view of a landfill slope of the hazardous waste landfill system of the first embodiment of the present invention;
fig. 5 is a schematic structural view of a landfill site bottom of the hazardous waste landfill system according to the first embodiment of the present invention;
fig. 6 is an operational view of a hazardous waste landfill system according to a first embodiment of the present invention;
reference numerals: 10. a landfill region; 11. burying the field bottom of the region; 12. burying a side slope in a landfill area; 13. a bottom landfill region; 14. a middle landfill region; 20. an anti-seepage unit; 21. an impermeable layer; 22. a first impermeable protective layer; 221. a first geotextile layer; 222. bagging a sand layer; 23. a second impermeable protective layer; 231. a second geotextile layer; 232. a geotechnical composite drainage net layer; 233. a mat layer of the civil engineering mat; 30. an anchoring platform; 40. a temporary covering unit; 50. a discharge platform; 60. a crane; 70. and (5) dividing a dam.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1 to 6, a first embodiment of the present invention provides a hazardous waste landfill system, which includes a landfill unit, an anti-seepage unit 20 and a discharge platform 50.
The landfill unit comprises a plurality of landfill areas 10, the anti-seepage unit 20 is arranged on the landfill areas 10, and the anti-seepage unit 20 comprises an anti-seepage layer 21 and an anti-seepage protection layer which are sequentially stacked from inside to outside. The impermeable protective layer arranged on the landfill area 10 can effectively protect the impermeable layer 21 from being damaged and guide and discharge the percolate to the percolate guide and discharge system arranged at the bottom 11 of the landfill area, thereby preventing the soil around the landfill unit from being polluted by the percolate.
A plurality of landfill district 10 arranges in proper order toward the low department of relief along the relief eminence, and the relief is the highest landfill district 10's edge is equipped with and satisfies initial landfill operation platform 50 of unloading is with dangerous waste ton bag from the relief is the highest landfill district 10 begins to hang and puts, so that dangerous waste ton bag forms temporary road with platform 50 of unloading is connected, dangerous waste ton bag is formed by dangerous waste solidification bagging-off.
The hazardous waste ton bags are hoisted from the end of the landfill 10 using the crane 60 so as to form a temporary path for the hazardous waste ton bags to be connected to the discharge platform 50. The dangerous waste ton bags are utilized for initial landfill to form a temporary road, the increase of landfill storage capacity of the road on the ground can be eliminated, and the impermeable layer 21 can be prevented from being damaged.
In the present embodiment, the landfill region 10 has an upper opening and is defined by a landfill bottom 11 and a landfill slope 12 extending upward from the landfill bottom 11, and the anchoring platform 30 is disposed at the edge of the upper opening of the landfill region 10;
the barrier layer comprises a first barrier layer 22 and a second barrier layer 23; the first impermeable protective layer 22 is arranged on the landfill slope 12 and comprises a first geotextile layer 221 and a bagged sand layer 222 which are stacked from inside to outside. The first geotextile layer 221 and the bagged sand layer 222 arranged on the side slope 12 of the landfill area can effectively protect the impermeable layer 21 from being damaged and guide and discharge the percolate into a percolate guide and discharge system arranged at the bottom 11 of the landfill area, so that the soil around the landfill unit is prevented from being polluted by the percolate.
The second impermeable protective layer 23 is arranged on the landfill site bottom 11 and comprises a second geotextile layer 231, a geotextile composite drainage mesh layer 232 and a geotextile mat layer 233 which are stacked from bottom to top. The second geotextile layer 231, the geotechnical composite drainage mesh layer 232 and the geotechnical mat layer 233 are arranged on the bottom of the landfill area 10 to protect the impermeable layer 21 from being damaged, so that leachate is prevented from permeating into soil from the bottom of the landfill area 10.
The first geotextile layer 221 and the second geotextile layer 231 are integrally connected, and the edge end of the first geotextile layer 221 is fixed on the anchoring platform 30 so as to prevent the first geotextile layer 221 from slipping.
In this embodiment, the hazardous waste landfill system further includes an anchoring platform 30, the discharging platform 50 is disposed on the anchoring platform 30, and the impermeable layer 21 and the edge end of the first geotextile layer 221 are fixed on the anchoring platform 30. The anchoring platform 30 is arranged to prevent the anti-seepage unit 20 from sliding, so that the anti-seepage effect is ensured.
In this embodiment, the barrier layer 21 comprises two high density polyethylene geomembranes arranged in a stacked arrangement. The high-density polyethylene geomembrane has the advantages of strong tensile force and strength, ultraviolet resistance, ageing resistance and corrosion resistance, and the high-density polyethylene geomembrane is adopted as the anti-seepage layer 21, so that the anti-seepage effect is good and the high-density polyethylene geomembrane is durable.
In this embodiment, the landfill site has 5 landfill regions 10, which are a first landfill region, a second landfill region, a third landfill region, a fourth landfill region and a fifth landfill region arranged in a straight line, and a partition dam 70 is disposed between adjacent landfill regions 10 for separation. One landfill area is arranged in the highest region of the landform of the landfill unit, and other landfill areas 10 are sequentially arranged from high to low according to the using sequence and the landform.
In this embodiment, the edge of the landfill area 10 with the highest terrain is provided with a discharging platform 50 which meets the initial landfill operation, and the discharging platform 50 is arranged on the anchoring platform 30.
In this embodiment, the hazardous waste landfill system further includes a temporary covering unit 40, and the edge end of the temporary covering unit 40 is fixed on the anchoring platform 30 by using a bagged soil or sand weight method or an expansion screw to temporarily cover the upper opening. In order to prevent rainwater from directly entering the dangerous waste pile, the temporary covering of the temporary covering unit 40 for the filled dangerous waste is covered with an upper opening, and the temporary covering unit is uncovered during filling operation and covered immediately after filling every day, so that the production amount of percolate is reduced from the source. The temporary covering unit 40 is prevented from slipping by fixing the edge end of the temporary covering unit 40 in the anchoring platform 30 at the edge of the landfill area 10 by means of a weight-reducing method or expansion bolts.
After the temporary covering unit 40 is constructed, the bottom of the side slope 12 of the landfill area is pressed by waste tires. Since the rainwater on the covering film can not be drained out of the landfill area 10 by gravity flow, a water collecting pit is intentionally formed at the lowest part of the terrain during the landfill operation, so that the rainwater is naturally collected to the water collecting pit and then is pumped out of the landfill area 10 by a portable water pump.
In this embodiment, the temporary covering unit 40 is a high density polyethylene geomembrane, and the thickness of the temporary covering unit 40 is 0.75-1.0 mm. The high-density polyethylene geomembrane has the advantages of strong tensile force and strength, ultraviolet resistance, ageing resistance and corrosion resistance, and is more durable as the temporary covering unit 40, so that rainwater is prevented from entering the landfill area 10.
In this embodiment, the hazardous waste ton bag is formed by bagging after curing the hazardous waste, and the specific forming steps are as follows: according to the property of the hazardous waste, firstly, stabilizing and curing are carried out in a stabilizing and curing workshop, and after 5-10 days of curing, the compressive strength can reach 5kg/cm after 5 days of curing2The compressive strength of the product can reach 10kg/cm after 10 days of curing2. And after the detection is qualified, bagging the stabilized and solidified hazardous waste to form a hazardous waste ton bag, and then transporting the hazardous waste ton bag filled with the stabilized and solidified hazardous waste to the landfill area 10 by using a dump truck or a forklift. The hazardous waste is subjected to stabilization and solidification treatment and is transported by bagged bags of tons, so that the secondary pollution in the transportation process is avoided and the percolate production in the landfill process is reduced.
The dangerous waste ton bag is buried from a highest-terrain landfill area, a certain amount of the stabilized and solidified dangerous waste ton bags need to be accumulated, 2 hanging straps or hanging ropes are arranged on the ton bags, and a hanging hook of the crane 60 is hung at the central part of the hanging straps or the hanging ropes during hanging without obliquely hanging, single-side hanging or obliquely pulling the ton bags. And (3) initially burying on a discharging platform 50, hoisting and placing the ton bags filled with the stabilized and solidified hazardous wastes one by one from the bottom of a landfill area by using a crane 60 until a temporary off-site road connecting discharging platform 50 which can be driven by a landfill machine is formed. After the landfill machine enters the field, the dangerous waste is transported to the bottom 11 of the landfill area to be spread and compacted, the landfill machine can be driven to operate after the thickness of the dangerous waste is filled to be more than 1m, and the post-operation of transportation and landfill is carried out by adopting the landfill machine to spread and roll the bags in layers after the bags containing the stabilized and solidified dangerous waste are directly transported to each landfill area 10 through a temporary off-site road formed by initial landfill. The dangerous waste ton bags are utilized for initial landfill to form a temporary road, the increase of landfill storage capacity of the road on the ground can be eliminated, and the impermeable layer 21 can be prevented from being damaged.
In the present embodiment, each landfill 10 is internally divided into a bottom landfill 13 and a middle landfill 14, the bottom landfill 13 is defined by the landfill side slope 12 and the landfill bottom 11, the middle landfill 14 is located on the bottom landfill 13, the bottom landfill 13 is used for landfill of slag, and the middle landfill 14 is used for landfill of fly ash, hazardous waste containing heavy metals and other hazardous waste. In the process of landfill operation, the bottom landfill area 13 is formed by the landfill slag in the landfill area 10 within 1m away from the field bottom and the side slope of the landfill area 10 to protect the anti-seepage unit 20 from being damaged, and the fly ash, the hazardous waste containing heavy metal and other hazardous waste are filled into the middle landfill area 14 to delay the silting time of the percolate guiding and discharging system, and also to reduce the concentration of heavy metal ions and salt in the percolate and reduce the treatment cost.
A second embodiment of the present invention provides a hazardous waste landfill method, which is applied to the hazardous waste landfill system described above;
the hazardous waste landfill method comprises the following steps:
dividing a landfill unit into a plurality of landfill areas 10, paving an impermeable layer 21 on each landfill area side slope 12 and a field bottom, and paving an impermeable protective layer on the impermeable layer 21 to form an impermeable unit 20;
a plurality of landfill district 10 arranges in proper order toward the low department of relief along the relief eminence, and the relief is the highest landfill district 10's edge is equipped with the platform 50 of unloading that satisfies initial landfill operation, forms hazardous waste ton bag with hazardous waste solidification bagging-off adoption crane 60 will on the platform 50 of unloading dangerous waste ton bag is hung and is put to being located the tip form interim road connection platform 50 of unloading of leaving the court in the landfill district 10, in order to satisfy the follow-up transportation and the landfill operation of hazardous waste ton bag.
Specifically, the preparation method of the dangerous ton bag comprises the following steps: adding a fixing agent, a stabilizing agent and water into the hazardous waste, stirring to form a hazardous waste solidified body, and bagging the hazardous waste solidified body to form a hazardous waste ton bag. The fixing agent is cement, lime or fly ash, and the stabilizing agent is sodium thiosulfate or a metal chelating agent.
A third embodiment of the present invention provides a hazardous waste landfill method, which is applied to the hazardous waste landfill system, and specifically includes the following steps:
dividing a landfill unit into a plurality of landfill areas 10, wherein the landfill areas 10 are sequentially arranged from high to low according to terrain, the edge of the landfill area 10 with the highest terrain is provided with a discharging platform 50 meeting initial landfill operation, and impermeable layers 21 are paved on the side slopes 12 and the bottom of each landfill area;
sequentially laying a first geotextile layer 221 and a bagged sand layer 222 on the impermeable layer 21 of the landfill slope 12 to form a first impermeable protective layer 22, sequentially laying a second geotextile layer 231, a geotechnical composite drainage mesh layer 232 and a geotechnical mat cushion layer 233 on the impermeable layer 21 of the landfill bottom 11 to form a second impermeable protective layer 23, and integrally connecting the first geotextile layer 221 and the second geotextile layer 231;
fixing the edge ends of the impermeable layer 21 and the first geotextile layer 221 on an anchoring platform 30;
after each landfill area 10 is built, covering a temporary covering unit 40 on the upper opening, and fixing the edge end of the temporary covering unit 40 on the anchoring platform 30 by adopting a weight pressing mode or an expansion screw;
adding a fixing agent, a stabilizing agent and water into the hazardous waste, wherein the fixing agent is cement, lime or fly ash, the stabilizing agent is sodium thiosulfate or a metal chelating agent, the weight ratio of the hazardous waste to the fixing agent to the stabilizing agent to the water is 3-5: 1: 0.02-0.04: 0.5-0.7, stirring to obtain a solid mixture to form a hazardous waste solidified body, and bagging the hazardous waste solidified body to form a hazardous waste ton bag;
uncovering the temporary covering unit 40, and hoisting the hazardous waste ton bags to the landfill area 10 with the highest terrain by adopting a crane 60 on the unloading platform 50 to form a temporary off-site road connection unloading platform 50 so as to meet the subsequent transportation and landfill operation of the hazardous waste ton bags, wherein the landfill sequence is that landfill is carried out from high to low according to the terrain of the landfill area 10;
and after the landfill is finished, covering by using the temporary covering unit 40.
A fourth embodiment of the present invention provides a hazardous waste landfill method, which is applied to the hazardous waste landfill system, and specifically includes the following steps:
1) arranging a landfill:
according to the using time and the site topography of the landfill, the landfill is divided into a plurality of landfill areas 10, the landfill area 10 for firstly burying dangerous waste is set as a landfill area, the landfill area is arranged in the area with the highest landfill topography, other landfill areas 10 are sequentially arranged from high to low according to the using sequence and the topography, percolate can seep from the dangerous waste stack body as soon as possible and is collected to the lowest position, the decontamination and shunting are facilitated, and the stability of the dangerous waste stack body is improved. Each landfill area 10 is provided with an anti-seepage unit 20 and an anchoring platform 30 capable of laying the anti-seepage unit 20, the width of the anchoring platform 30 is generally set to be 4-6 m to meet mechanical operation as much as possible, an anchoring ditch is arranged at a distance of not less than 0.8m from the outer side of the anchoring platform 30, plain concrete is used for backfilling the anti-seepage unit 20 to prevent the anti-seepage unit from sliding off, and the anti-seepage unit 20 comprises an anti-seepage layer 21 provided with two layers of High Density Polyethylene (HDPE) geomembranes with the thickness of 2.0mm, a first anti-seepage protective layer 22 and a second anti-seepage protective layer 23. After the anti-seepage unit 20 is constructed, the integrity of the High Density Polyethylene (HDPE) geomembrane is detected to determine and repair the damage or weld problems caused during the construction process. The first landfill area is provided with a discharge platform 50 which can meet the initial landfill operation.
Specifically, the impermeable protective layer comprises a second geotextile layer 231 laid at the bottom of the field, a geotechnical composite drainage mesh layer 232, a geotechnical mat layer 233, a first geotextile layer 221 laid on the side slope and a bagged sand layer 222.
Specifically, the unloading platform 50 is arranged on the anchoring platform 30 arranged in a landfill area, is close to the initial landfill and is positioned at the position of the landfill area 10 with the height of the terrain, the width is 6 m-15 m, and the length is 10 m-20 m, so that the operation requirement of the crane 60 can be met.
2) Temporary coverage facility setting:
after the landfill area 10 is built, a temporary covering unit 40 is arranged above the seepage-proofing unit 20, which can be implemented synchronously with the seepage-proofing unit 20, and each block is overlapped at the position of the anchoring platform 30. In order to prevent wind from blowing away in the future, the side slope and the field bottom are weighted by waste tires after the temporary covering unit 40 is constructed, and the anchoring platform 30 is fixed by bagged soil or sand or expansion screws. The temporary covering unit 40 at the bottom of the field is directly covered by waste tires, the waste tires with weights on the side slopes are bound in series by anti-aging materials, the diameter requirement is not less than 10mm, the arrangement distance of the waste tires with weights is 1-4 m, and the temporary covering unit can be properly increased or decreased on the field according to whether the temporary covering unit is a typhoon area or not. The materials for binding the waste tires on the slope need to be checked regularly, and if the materials are aged, the materials need to be replaced in time.
Specifically, the temporary covering unit 40 is a High Density Polyethylene (HDPE) smooth geomembrane with the thickness of 0.75mm or 1.0mm, the temporary covering unit 40 is divided into a plurality of blocks, each block is welded into a whole by a double-track hot melt welding machine, the High Density Polyethylene (HDPE) geomembranes in different rolls are welded into a whole, the blocks are overlapped by a high-direction low-water gap when being laid, and the overlapping width is 1-2 m. The integrity of the temporary covering unit 40 should be checked by visual inspection often manually during the landfill process, and should be replaced in time if damaged.
3) Transportation of hazardous wastes:
according to the property of the dangerous waste, firstly carrying out stabilization and solidification in a stabilization and solidification workshop for 5-10 daysThe compressive strength of the product can reach 5kg/cm after 5 days of curing2The compressive strength of the product can reach 10kg/cm after 10 days of curing2. And after the detection is qualified, packaging the stabilized and solidified hazardous waste by using a ton bag, and then transporting the stabilized and solidified hazardous waste ton bag to a landfill site by using a dump truck or a forklift.
Specifically, the stabilizing solidification adopts curing agents such as cement, lime (fly ash) and the like, stabilizing agents such as sodium thiosulfate, metal chelating agents and the like and water to be stirred and maintained with the hazardous waste according to the property components of the hazardous waste according to the proportion, and then the loose hazardous waste with high water content is solidified into a stable, anti-crushing and hash solidified body. The single type of hazardous waste material should adopt single mixing stirring, and different periods stir different hazardous wastes, and the hazardous waste material of different types is unsuitable to mix the stirring simultaneously. And curing the cured body in a stabilization curing workshop or a landfill according to the incoming hazardous waste condition, if the incoming hazardous waste, the curing agent and the stabilizing agent are processed stably according to the proportion, directly filling the cured body into a ton bag and transporting the ton bag to a landfill operation area for landfill, detecting the incoming material or the curing agent and the stabilizing agent again when the incoming material or the curing agent and the stabilizing agent are changed, and transporting the cured body into the landfill operation area for landfill treatment after the detection is qualified.
Specifically, the ton bag is woven by geotextile, the geotextile specifically comprises polyester fiber materials such as polypropylene and polyethylene, the weight of the filled stabilized and cured dangerous waste is 0.5 ton-1.5 ton, and the volume is 500L-1200L.
4) And (3) hazardous waste landfill:
according to the arrangement of a landfill site, the dangerous waste is filled from a landfill area, a certain amount of stabilized and solidified dangerous waste needs to be accumulated, and bags are filled by adopting ton bags, the tonnage of the crane 60 can be 25 tons, 50 tons or 100 tons according to the horizontal distance and the height between the bottom of the landfill area and the unloading platform 50, and one ton bag is hung each time. And initially burying on a discharging platform 50, hoisting and placing the ton bags filled with the stabilized and solidified hazardous wastes one by one from the bottom of a landfill area by using a crane 60 until a temporary road which can be driven by a landfill machine is formed and connected with the discharging platform 50. After the landfill machine enters a field, the dangerous waste is transported to the bottom of the landfill field to be paved and leveled, the landfill machine can be driven to operate after the thickness of the dangerous waste is filled to be more than 1m, and the post-landfill operation adopts the landfill machine to carry out layered paving and rolling operation after the stabilized and solidified dangerous waste ton bags are directly transported to each landfill area 10 through a temporary road formed by the initial landfill. In the landfill operation process, only the incineration furnace slag is filled in the range of 1m of the thickness of the bottom and the side slope of the field, other dangerous wastes such as fly ash, sludge containing heavy metal and the like are filled in the middle area, the salt-containing wastes are separately treated, and necessary water-proof and water-proof treatment is required.
5) Covering hazardous waste:
in order to prevent rainwater from directly entering the dangerous waste pile body, the temporary covering unit 40 is adopted to comprehensively and temporarily cover the buried dangerous waste in time, the dangerous waste is uncovered during the landfill operation, the dangerous waste is covered immediately after the daily landfill is finished, and the generation amount of percolate is reduced from the source. When the pit filling operation is performed, since the rainwater on the temporary covering unit 40 cannot be drained out of the landfill site by self-flow, a water collecting pit is intentionally formed at the lowest position during the filling operation, so that the rainwater is naturally collected to the water collecting pit and then is drained out of the landfill site by a portable water pump.
To sum up, the utility model provides a hazardous waste landfill method, beneficial effect lies in: firstly, stabilizing and solidifying the hazardous waste into a hazardous waste solidified body and bagging the hazardous waste solidified body, wherein the compressive strength of the hazardous waste solidified body reaches 5-10 kg/cm2The method has the advantages that hazardous waste materials are organized and transported, a reinforcement stabilizing effect can be realized on the hazardous material pile, the secondary pollution in the transportation process can be avoided, the percolate generation amount in the landfill process is reduced, and the silting time of a percolate collecting system is delayed.
The dangerous waste ton bag filled with the dangerous waste solidified bodies is hoisted on the unloading platform 50 by the crane 60 to form a temporary off-site road for initial landfill, so that the requirement of subsequent transportation and landfill operation of the dangerous waste solidified bodies can be met, the permanent off-site road can be cancelled to increase the landfill capacity, and meanwhile, the partition landfill is sequentially carried out from high to low according to the terrain of the landfill area 10 and the temporary coverage is timely carried out, so that the problem of sewage disposal and diversion in the dangerous waste landfill process is solved, the percolate generation amount is reduced from the source, and the landfill treatment cost and the environmental pollution risk are reduced.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (5)
1. The hazardous waste landfill system is characterized by comprising a landfill unit, an anti-seepage unit and a discharge platform, wherein the landfill unit comprises a plurality of landfill areas, the anti-seepage unit is arranged on the landfill areas, and the anti-seepage unit comprises an anti-seepage layer and an anti-seepage protective layer which are sequentially stacked from inside to outside;
a plurality of the landfill district is arranged along relief eminence toward relief low place in proper order, and the relief is the highest the edge of landfill district is equipped with satisfies initial landfill operation the platform of unloading is highest with dangerous waste ton bag follow the relief the landfill district begins to hang and puts, so that dangerous waste ton bag forms temporary road with the platform of unloading is connected, dangerous waste ton bag is formed by dangerous waste solidification bagging-off.
2. The hazardous waste landfill system of claim 1, wherein the landfill is surrounded by a landfill floor and a landfill slope extending upwardly from the landfill floor;
the anti-seepage protective layer comprises a first anti-seepage protective layer and a second anti-seepage protective layer, wherein the first anti-seepage protective layer is arranged on the side slope of the landfill area and comprises a first geotextile layer and a bagged sand layer which are stacked from inside to outside;
the second anti-seepage protective layer is arranged on the bottom of the landfill area and comprises a second geotechnical cloth layer, a geotechnical composite drainage mesh layer and a geotechnical mat cushion layer which are stacked from bottom to top;
the first geotextile layer and the second geotextile layer are integrally connected.
3. The hazardous waste landfill system of claim 2, further comprising an anchoring platform, wherein the discharge platform is disposed on the anchoring platform, and wherein the impermeable layer and the edge end of the first geotextile layer are secured to the anchoring platform.
4. The hazardous waste landfill system of claim 3, further comprising a temporary covering unit, an edge end of which is fixed to the anchoring platform using a weight down manner or an expansion screw to temporarily cover the landfill area.
5. The hazardous waste landfill system of claim 4, wherein the temporary covering unit is a high density polyethylene geomembrane, and the thickness of the temporary covering unit is 0.75-1.0 mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108705A (en) * | 2020-08-31 | 2022-03-01 | 中国瑞林工程技术股份有限公司 | Hazardous waste landfill system and method |
| CN115213189A (en) * | 2021-10-22 | 2022-10-21 | 湖南中冶长天节能环保技术有限公司 | Dangerous waste filling system for rigid landfill and control method |
| CN115213188A (en) * | 2021-10-22 | 2022-10-21 | 湖南中冶长天节能环保技术有限公司 | Hazardous waste landfill method and system for rigid landfill |
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2020
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108705A (en) * | 2020-08-31 | 2022-03-01 | 中国瑞林工程技术股份有限公司 | Hazardous waste landfill system and method |
| CN115213189A (en) * | 2021-10-22 | 2022-10-21 | 湖南中冶长天节能环保技术有限公司 | Dangerous waste filling system for rigid landfill and control method |
| CN115213188A (en) * | 2021-10-22 | 2022-10-21 | 湖南中冶长天节能环保技术有限公司 | Hazardous waste landfill method and system for rigid landfill |
| CN115213188B (en) * | 2021-10-22 | 2023-10-27 | 湖南中冶长天节能环保技术有限公司 | Method and system for dangerous waste landfill of rigid landfill |
| CN115213189B (en) * | 2021-10-22 | 2024-02-20 | 湖南中冶长天节能环保技术有限公司 | Dangerous waste filling system of rigid landfill and control method |
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