CN102367667B - Landfill method for accelerating percolate degradation in landfill site - Google Patents
Landfill method for accelerating percolate degradation in landfill site Download PDFInfo
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Abstract
The invention discloses a landfill method for accelerating percolate degradation in a landfill site. The method is characterized by comprising the following steps of: arranging percolate collecting pipes in a non-full flow form, introducing air into a percolate collecting layer and air conducting gabions from the percolate collecting pipes and diffusing the air to a peripheral rubbish body during collection of landfill percolate, and setting the part region in the rubbish body in the landfill site in an aerobic environment and the other regions in a facultatively anaerobic environment and an anaerobic environment to accelerate the degradation of organic matters; at the same time, increasing the height of the percolate collecting layer, forming an artificial aerobiont filter bed on the percolate collecting layer, and forcibly degrading the percolate; and collecting the percolate, spraying percolate backwards onto the surface in the landfilling process of the rubbish, and spraying the percolate backwards to a gas collecting layer on the lower part of a closing and covering system after the landfill site is closed. Due to the adoption of the method, the pollution load of the percolate can be lowered quickly, the percolate water quality is improved, the production amount and the treatment amount of the percolate are reduced, the production of odor and methane emission are reduced, and rapid stabilization of landfill is facilitated.
Description
Technical field
The present invention relates to consumer waste filling and embedding processing technology field, especially a kind of burying method that accelerates percolate degradation in landfill site.
Background technology
At present, the main processing mode that China's domestic waste adopts is sanitary landfills.2008 Nian， China domestic waste harmless treatment amounts are 10,216 ten thousand tons, and wherein sanitary landfills accounts for 83.8%.In following 10Nian Nei， China, will have 1000 middle-size and small-size Sanitary Landfills, newly-increased landfill scale is more than 8,000 ten thousand tons, and day landfill household garbage is over 500,000 tons.
Traditional sanitary landfills is in bottom, to build impervious barrier, the gravel that 30cm is thick (cobble) layer is set conventionally as leachate collection layer on it, lays at a certain distance vertical air guide gabion and collects landfill gas, and landfill reaches design height, closes on request.Traditional sanitary filling field garbage degradation is substantially in anaerobic environment, thereby there is following shortcoming: (1) leachate contamination concentration is high, process investment and operating cost high, intractability great ， townlet are difficult to bear great number investment and the operating cost that percolate is processed; (2) landfill yard produces the foul gas such as a large amount of ammonia nitrogens, hydrogen sulfide, affects the utilization in surrounding enviroment and a large amount of soils of periphery; (3) anaerobic degradation produces a large amount of methane, and the middle-size and small-size landfill yard for being worth without utilization of LFG, has increased greenhouse gas emissions; (4) the Landfill Stabilization Rate time long (over 40 years), the land reclamation cycle is long.
At present, the problem facing for solving above-mentioned Landfill, mainly contains two kinds of technology modes.
The one, the aerobic Landfill of standard that proposed 70 years last century by Japanese scholars.The principle of accurate aerobic landfill is that the slack flow by leachate collection pipe designs, under the effect of landfill yard internal-external temperature difference, make air natural enter landfill yard by leachate collection pipe end, thereby make rubbish interior section region in aerobic state, particularly at percolate gutter and header, there is aerobic region around, suppressed the generation of the gases such as biogas and hydrogen sulfide, the speed of garbage degradation is improved, both accelerated the stable of rubbish, reduce again the discharge of biogas, also reduced the pollution intensity of percolate simultaneously.
The 2nd, the bioreactor landfill technology that the seventies in last century, American scholar proposed.The basic thought of bioreactor landfill is to regard whole landfill yard as a bioreactor, by autotelic control device, and enhancement microbiological process, thus accelerate easily degraded and medium easy degraded organic component conversion and stable in rubbish.Different by the method for operation, bioreactor landfill can be divided into the types such as anaerobic type (restriction oxygen enters) and accurate aerobic type (natural ventilation system oxygen supply) and aerobic type (artificially ventilating).By the operation of bioreactor landfill, can reduce leachate contamination intensity, accelerate landfill yard and stablize, improve gas yield and gas production rate, reduce landfill waste disposal cost.For achieving the above object, bioreactor landfill can adopt the control device that comprises liquid (water, percolate) injection, the design of alternative covering layer, nutrition interpolation, the adjusting of pH value, temperature adjusting, oxygen supply and microbial inoculant etc.
But adopt above-mentioned technical finesse rubbish, because aerobic region is limited, percolate degradation rate is slow, and the waste stabilisation time is still longer.How further to improve the degradation effect of landfill percolate, reduce percolate concentration, accelerate landfill yard waste stabilisation, remain the direction that those skilled in the art make great efforts research.
Summary of the invention
Not enough for above-mentioned prior art, the technical problem to be solved in the present invention is: how a kind of burying method that accelerates percolate degradation in landfill site is provided, make it can reach further raising waste stabilisation speed, improve the object of percolate degradation effect and reduction percolate concentration.
In order to solve the problems of the technologies described above, in the present invention, adopted following technical scheme:
A kind of burying method that accelerates percolate degradation in landfill site, its feature is, in landfill yard, leachate collection pipe is adopted to non-flowing full setting, the mode that is 12.5～15m according to service radius is arranged air guide gabion, and while making to collect leachate, air can enter into filtrate collecting layer and air guide gabion and to the diffusion of periphery rubbish body from leachate collection pipe, makes in landfill yard in rubbish body subregion in aerobic environment, organic matter degradation, in oxygen, the anaerobic environment of holding concurrently, is accelerated in all the other regions; According to the method for designing in ordinary biofilter method sewage disposal technology, leachate collection layer height is set, makes leachate collection layer form artificial aerobe filter bed, percolate is carried out to degradation treatment by force simultaneously; Collect percolate, in garbage loading embeading process, percolate carries out surperficial recycling spraying simultaneously, and after Closure of landfill site, percolate recycling spraying is in the gas collection layer of Closure cover system bottom.
More particularly, in the technical program, first in landfill yard bottom, lay impervious barrier, impervious barrier is obliquely installed, impervious barrier lowest part arranges a regulating reservoir, on impervious barrier, table arranges described leachate collection layer, leachate collection layer adopts the gravel that particle diameter is 25～40mm to lay, leachate collection layer bottom is equipped with described leachate collection pipe, leachate collection manifold is always to regulating reservoir top, in landfill yard, adopt described air guide gabion to form a plurality of air guide vertical shafts that lower end communicates with filtrate collecting layer, above refuse landfill, adopt back again jet pipe road to form back spray system, going back to jet pipe road is summarized in regulating reservoir and is provided with water pump and provide hydraulic power for returning spray system, wherein, described leachate collection pipe arranges according to following non-flowing full principle: caliber 200～300mm, and design maximum degree of filling is 0.5, caliber 350～450mm, design maximum degree of filling is 0.6, caliber 500mm and more than, design maximum degree of filling is 0.7, described filtrate collecting layer height is determined according to following formula design:
H＝(Q
r.S
0)/(A.N
v) (1)
In formula (1), H---leachate collection layer height, unit is m; Q
r---going back to jet flow Liang， unit is m
3/ d; S
0---percolate COD concentration, unit is g/L, during design, rule of thumb value is 6～12g/L; A---landfill district area, unit is m
2; N
v---bacteria bed volume COD load, unit is kgCOD/ (m
3while d) designing, rule of thumb value is 0.1～0.15kgCOD/ (m
3d);
Described in formula (1), returning the available following formula of jet flow amount calculates:
Q
r＝N
s.A
e (2)
In formula (2), A
e---leachate recycle area, unit is m
2; N
s---landfill yard hydraulic load, unit is m
3/ (m
2d), rule of thumb value is 0.009～0.015m during design
3/ (m
2d).
In technique scheme, the passage that the passage that described air guide vertical shaft is derived as rubbish waste gas simultaneously and oxygen diffuse into rubbish body inside, described air guide gabion service radius is air guide vertical shaft service radius, refer to collect the effective range of rubbish waste gas, the factors such as its value size and air guide gabion diameter and internal clearance are how many are relevant, concrete method to set up belongs to prior art, and air guide gabion spacing is generally determined according to air guide gabion service radius.According to correlative study result, the oxygen consuming radius of oxygen when landfilled MSW 6 horizontal direction diffusion is about 7.3m, therefore air guide gabion is arranged by spacing 25～30m in the present invention, service radius is about 12.5～15m.Like this can be so that rubbish body be moderate in the ratio of aerobic environment and double oxygen, anaerobic environment, again in conjunction with recycling spraying technology, can farthest increase degradation effect so that percolate obtains the circulating biological treatment effect of the aerobic-oxygen-anaerobism of holding concurrently, reduce percolate concentration.
In technique scheme, the passage that can enter as air when can be used as filtrate collection conduit according to the leachate collection pipe of non-flowing full principle design, leachate collection manifold is always to place, regulating reservoir top, the mode discharge opeing that goes out stream with non-submersion is to regulating reservoir, therefore can communicate with atmosphere, outside air can, by blast and hot pressing function, enter leachate collection layer and air guide vertical shaft from leachate collection pipe.The concrete laying method of described leachate collection pipe belongs to prior art, is generally to adopt caliber to be not less than the HDPE pipe of 250mm gathering place and main road, and the HDPE that each bypass line adopts caliber to be not less than 200mm manages.During the design of leachate collection pipe, the parameter of described each pipeline design maximum degree of filling is empirical value, adopts this parameter can meet the ventilation oxygen supply demand of bacteria bed; Meanwhile, described non-flowing full method to set up also belongs to prior art, does not belong to the contribution of the present invention to prior art, therefore all not in this narration.Like this, by eddy diffusion and dispersion, the rubbish body to leachate collection layer and air guide vertical shaft periphery spreads airborne oxygen, make landfilled MSW subregion in aerobic environment, local in oxygen, the anaerobic environment of holding concurrently, thereby promote organic matter fast degradation, accelerate the stabilizing process of landfill yard, reduce methane, hydrogen sulfide gas generation, reduce foul smell and produce.
In technique scheme, described leachate collection layer adopts gravel to lay, particle diameter is 25～40mm, formula (1) and formula (2) that design leachate collection layer height adopts, be the formula of definite filtrate collecting layer height in the method for designing that in sewerage treatment, ordinary biofilter and underground sewage percolating are processed.In formula, the bacteria bed volume COD N that loads
vimmediately refer to leachate collection layer volume COD load, herein according to bacteria bed design experiences value.N
srepresent landfill yard hydraulic load, for fear of leachate recycle, cause landfill yard ponding, landfill yard hydraulic load should be less than the permeability of rubbish body.Data shows, the saturated hydraulic conductivity of compacting vertical garbage is 2 * 10
-5～10
-4cm/s, is equivalent to 17.3～86.4L/ (m
2d).In addition, increase percolate capacity of returns, be conducive to improve the evaporation capacity of percolate, while conventionally returning jet flow amount and be 1～3 times of evaporation capacity, can obtain good evaporation effect.China mostly average evaporation capacity in area is 3～5mm/d.Therefore consider permeability and the evaporation effect of rubbish body, landfill yard hydraulic load rule of thumb value is 0.009～0.015m
3/ (m
2d).During calculating, formula (2) substitution formula (1) can be obtained,
H＝(N
s.A
e.S
0)/(A.N
v) (3)
Leachate recycle area A in the technical program
eequal landfill district area A, therefore formula (3 can) is simplified to H=(N
s.S
0)/N
v; The value range of three parameters is brought into formula calculating known, leachate collection layer height span is 60～120cm again; In this altitude range, can meet the requirement of bacteria bed processing capacity, the air importing in conjunction with leachate collection pipe, can be so that leachate collection layer forms an artificial aerobe filter bed.In rubbish body bottom, form after artificial aerobe filter bed.Aerobe filter bed carries out intensive treatment to the percolate after rubbish body, has improved the treatment effect of percolate organic matter and ammonia nitrogen.Percolate quilt time containing nitrate is sprayed onto in rubbish body after treatment, is formed nitrogen, thereby reduce the accumulation of ammonia nitrogen in rubbish body is held concurrently oxygen and anaerobic environment by denitrification, has greatly improved leachate quality.
In addition, in described technical scheme, the concrete structure of described impervious barrier and time spray system, all belongs to ripe prior art, therefore need not describe in detail and introduce.In landfill process, carry out percolate surface and return spray, utilize the transpiration on landfill yard surface, reduce the generation of percolate, when the atmospheric evaporation amount of landfill yard is while being amount of precipitation more than 1.4 times, even can realize in landfill process outer row of percolate.After Closure of landfill site, for preventing that in the process of recharging, rainfall enters landfill yard, in covering layer bottom, adopt back of pipeline spray.
Tool of the present invention has the following advantages:
1. leachate collection layer height can be greater than traditional landfill percolate collecting layer height, improved ventilation condition, expanded the aerobic scope of landfilled MSW, promoted organic degraded, accelerated the stabilizing of rubbish, suppress the generation of hydrogen sulfide, ammonia and methane simultaneously, reduce foul smell generation, improved landfill yard surrounding enviroment.
2. the leachate collection layer of bottom 60～120cm, it is highly to obtain according to the method for designing in ordinary biofilter method sewage disposal technology, can make landfill yard bottom form bioreactor---the aerobe filter bed that is similar to bio filter or subsurface seepage flow treatment system, improved the treatment effect of percolate organic matter and ammonia nitrogen, reduced percolate COD and ammonia nitrogen concentration, alleviated follow-up percolate and processed load.
3. percolate recycling spraying is to rubbish body, constantly repeat to experience the circulating biological processing procedure of the aerobic-oxygen-anaerobism of holding concurrently, organic matter wherein obtains degraded to a certain extent, simultaneously owing to having created the condition of biological nitration/denitrification denitrogenation, part nitrogen is also removed, thereby the ammonia nitrogen accumulation of having avoided traditional refuse landfill to cause under anaerobic environment, has greatly improved leachate quality.
4. in landfill process, carry out percolate surface and return spray, utilize the transpiration on landfill yard surface, reduce generation and the treating capacity of percolate.For atmospheric evaporation amount, be the above areas of 1.4 times of amount of precipitation, can realize the outer row of percolate in landfill process, without special percolate treatment facility is set at landfill yard, solve that percolate is difficult, the difficult problem such as investment and operating cost height.Present technique is particularly suitable for that evaporation capacity is large, the relatively less Small Urban landfill disposal of amount of precipitation.
5. the present invention, by increasing leachate collection layer height, using leachate collection layer as percolate processing unit, saves outside percolate and processes occupation of land and expense; The stabilization of landfill waste, shortens the management cycle after Closure of landfill site, saves corresponding expense.Therefore the present invention has obvious economic benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation sketch in the soot of the present invention in garbage loading embeading process.
Fig. 2 is the structural representation sketch in the soot of the present invention after garbage loading embeading closes.
Fig. 3 is model test apparatus structural representation of the present invention.
Fig. 4 is that model test apparatus upper strata oxygen concentration changes diagram.
Fig. 5 is that model test apparatus middle level oxygen concentration changes diagram.
Tu6Wei model test apparatus lower floor oxygen concentration changes diagram.
Fig. 7 is model test apparatus percolate COD change in concentration diagram.
Fig. 8 is that model test apparatus percolate ammonia nitrogen concentration changes diagram.
The specific embodiment
Below in conjunction with accompanying drawing and concrete test examples and embodiment, the present invention is described in further detail.
Fig. 1 is the structural representation sketch in the soot of the present invention in garbage loading embeading process.As shown in Figure 1, in the present invention, in landfill yard bottom, lay impervious barrier 1, impervious barrier 1 is obliquely installed and at lowest part, one regulating reservoir 4 is set, on impervious barrier 1, re-laying particle diameter is 25～40mm gravel, becomes leachate collection layer 3, and leachate collection layer 3 height are according to formula (3) H=(N
s.A
e.S
0)/(A.N
v) determine; Leachate collection pipe 2 is laid in bottom at leachate collection layer 3.Leachate collection pipe 2 arranges by following non-flowing full principle: caliber 200～300mm, and design maximum degree of filling is 0.5; Caliber 350～450mm, design maximum degree of filling is 0.6; Caliber 500mm and more than, design maximum degree of filling is 0.7.Leachate collection pipe 2 gathers to regulating reservoir 4 tops, and the form that the percolate that makes to collect goes out stream with non-submersion enters regulating reservoir 4; In landfill yard, adopt air guide gabion 5 to form a plurality of air guide vertical shafts that lower end communicates with filtrate collecting layer 3, above refuse landfill, adopt back jet pipe road 7 to form back spray system, time jet pipe road 7 is summarized in regulating reservoir 4 and is provided with water pump 9 provides hydraulic power for returning spray system again.During work, under the powered effect that outside air forms at msw landfill internal-external temperature difference, from leachate collection pipe 2, enter in landfill yard, and rapidly to leachate collection layer 3 and 5 diffusions of air guide gabion, at the interior formation aerobic environment of leachate collection layer 3.Simultaneously by eddy diffusion and dispersion, the rubbish body to leachate collection layer 3 and air guide gabion 5 peripheries spreads oxygen, make landfilled MSW 6 subregions in aerobic, local in oxygen and the anaerobic environment of holding concurrently.According to correlative study result, the oxygen consuming radius of oxygen when landfilled MSW 6 horizontal direction diffusion is about 7.3m, and for guaranteeing that landfilled MSW major part is in aerobic/accurate aerobic environment, air guide gabion is by spacing 25～30m layout, and service radius is 12.5～15m.In garbage loading embeading process, percolate pass through back jet pipe road 7 constantly recycling spraying in landfilled MSW 6 surfaces.
Fig. 2 is the structural representation sketch in the soot of the present invention after garbage loading embeading closes, after Closure of landfill site, as shown in Figure 2, on the basis of Fig. 1, landfilled MSW 6 reaches design height, the top of landfilled MSW 6 has increased Closure cover system 8, and the spray system of returning of returning 7 formation of jet pipe road is positioned at Closure cover system 8 inside, and percolate is sprayed on for 7 times in Closure cover system 8 lower gas collecting layers by going back to jet pipe road.Like this, after garbage loading embeading closes, percolate still constantly recycling spraying to landfilled MSW 6 surfaces; Until by the detection of percolate being found to garbage degradation meet the requirement of environmental protection.
Test examples
Accurate aerobic landfill model equipment test, according to leachate collection layer height of the present invention, dwindles by geometrical model, simulates the actual working environment in soot of the present invention, verifies to a certain extent action effect of the present invention principle.
(1) experimental rig
Fig. 3 is model test apparatus structural representation of the present invention.Adopt Fig. 3 shown device simulation soot to test, as shown in the figure, the internal diameter of the experimental rig garbage loading embeading post 10 of employing is 600mm, highly is 1800mm, establishes altogether four groups, is designated as respectively T1, T2, T3 and T4.Every group of bottom of device all laid the porous leachate collection pipe 2 of a DN50, leachate collection pipe 2 tops and around to lay respectively with gravel be highly the leachate collection layer 3 of 60mm, 120mm, 180mm and 240mm.Garbage loading embeading post 10 central authorities arrange the air guide gabion 5 that diameter is 50mm.The rubbish 6 of landfill is highly 1000mm in landfill post, at rubbish 6, is filled to while being highly respectively 250mm (lower floor), 500mm (middle level) and 750mm (upper strata), and gas sampling point 11 is set respectively.Every layer is that 1/3 and 2/3 place is evenly arranged 8 sampled points at landfill column radius.When rubbish 6 landfill height reach 1000mm, lay at an upper portion thereof the rubble guide layer 12 that 50mm is thick.
(2) test material
Test rubbish is taken from Chongqing gathering station rubbish.Test waste component is: more than kitchen, and 50.58%; Vegetation, 2.37%; Stationery, 10.40%; Dry goods, 1.56%; Pericarp, 4.92%; Plastics, 5.22%; Brick and tile, 2.22%; Glass, 0.97%; Metal, 0.29%; Dirt and other, 19.03%.The compacted density of test filling rubbish is about 700kg/m
3.
(3) test method and analysis project
Rubbish loads after 2 weeks percolate is evenly returned and is sprayed onto rubble guide layer 12, returning spray frequency is 1 time weekly, returning discharge rate, press formula (1) definite by bacteria bed volumetric loading and percolate COD concentration, the volumetric loading of T1, T2, T3 and T4 control be respectively 0.3,0.15,0.1,0.075kgCOD/ (m
3d).Duration of test, to percolate COD, ammonia nitrogen and SO
4 2-oxygen concentration in concentration and rubbish body carries out the mensuration of 1 time weekly.Analysis test method, COD: potassium dichromate method, HACH-COD tester; Ammonia nitrogen: nessler reagent AAS; Sulfate: Barium Chromate Spectrophotometry; Oxygen concentration: GASBORD-MUT (4G) the type four component (O that Wuhan Sifang Photoelectric Science & Technology Co., Ltd. produces
2, CO
2, CH
4, H
2s) gas analyzer.
(4) result of the test
1, in rubbish body, oxygen concentration changes
Referring to accompanying drawing 4～6, accompanying drawing 4～6 is respectively that model test apparatus upper, middle and lower layer oxygen concentration changes diagram.Duration of test, in garbage loading embeading post, upper strata oxygen concentration is 8.44%～20.11%, middle level oxygen concentration is 2.32%～18.54%, and lower floor's oxygen concentration is 0.99%～15.54%, and all experimental rig oxygen concentrations all show as > middle level, upper strata > lower floor.Test started to the 20th week, and oxygen concentration is increases trend gradually, and T2, T3, T4 oxygen concentration be totally higher than T1 oxygen concentration, showed to increase leachate collection layer height and was conducive to oxygen and spreads in rubbish body.After 20 weeks, along with device starts, aerobic, hold concurrently oxygen and the active increase of anaerobe, oxygen concentration is downward trend gradually, oxygen concentration aggregate performance is T1 > T2 > T3 > T4, and this may be that biomass is many due to leachate collection floor height, aerobic amount is large, thereby has reduced to the oxygen amount spreading in rubbish body.Increase bacteria bed height and be conducive to improve percolate treatment effect.
In rubbish body, oxygen content is higher, and before 25 weeks, in rubbish body, methane content is very low, and maximum is no more than 2%, and most of sampled point can't detect methane; After 25 weeks, methane concentration maximum is no more than 24%.H
2s content is also very low, and before 16 weeks, maximum is no more than 3ppm, after 16 weeks, is no more than 0.4ppm.Result of the test can reduce the foul gas discharge values such as methane and hydrogen sulfide, improves surrounding environment.
Accompanying drawing 4 is that model test apparatus upper strata oxygen concentration changes diagram.X-axis is the time, and unit is week; Y-axis is the percentage composition of oxygen.
Accompanying drawing 5 is that model test apparatus middle level oxygen concentration changes diagram.X-axis is the time, and unit is week; Y-axis is the percentage composition of oxygen.
Accompanying drawing 6 is that model test apparatus lower floor oxygen concentration changes diagram.X-axis is the time, and unit is week; Y-axis is the percentage composition of oxygen.
2, percolate COD change in concentration
Referring to accompanying drawing 7, accompanying drawing 7 is model test apparatus percolate COD change in concentration diagrams.Initial percolate COD concentration is higher, is 60000～70000mg/L, and through returning spray 1 time weekly, COD concentration is obvious downward trend, but T1 decrease speed is totally slow compared with T2, T3 and T4.After 29 weeks, the percolate COD concentration of T1, T2, T3, T4 fall be down to respectively 2130,1705,1835,1750mg/L, COD clearance is respectively 96.86%, 97.19%, 97.30%, 97.34%, show to increase leachate collection layer height and be conducive to improve percolate treatment effect, accelerate the organic degraded of rubbish body and stable.
Accompanying drawing 7 is model test apparatus percolate COD change in concentration diagram.X-axis is the time, and unit is week; Y-axis is COD concentration, and unit is mg/L.
3, percolate ammonia nitrogen concentration changes
Accompanying drawing 8 is that model test apparatus percolate ammonia nitrogen concentration changes diagram.X-axis is the time, and unit is week; Y-axis is ammonia nitrogen concentration, and unit is mg/L.Referring to accompanying drawing 8, as shown in it, ammonia nitrogen concentration first rises, be up to 2100mg/L, then decline gradually, to 27 weeks, the ammonia nitrogen concentration of T1, T2, T3, T4 dropped to 127.3,108.4,98.9,111.1mg/L, there is not the situation that in anaerobism landfill yard, ammonia nitrogen raises gradually, be conducive to improve leachate quality.
Embodiment
In order further to verify effect of the present invention, applicant has done verification experimental verification in Sichuan refuse landfill field by using the inventive method.
Sichuan refuse landfill is total takes up an area 42 mu, design storage capacity 10.5 ten thousand steres, the design length of service 9 years, design average treatment amount 24.2 ton per days.Landfill yard weather belongs to continent, plateau monsoon climate, dry, and many average annual rainfalls are 786.4mm, average evaporation capacity 1536.4mm for many years, mean wind speed 1.2m/s.Adopt the accurate aerobic landfill process of leachate recycle of the present invention, run duration leachate recycle is to rubbish body surface, and returning spray hydraulic load is 4.8～6.4L/ (m
2d), be 80% of local water surface evaporation, through many commissioning tests half a year, realize the outer row of percolate zero, in junk-heap body, can't detect CH
4and H
2s, CO
2and O
2concentration be about respectively 15.4% and 16.1%, percolate COD concentration is less than 3000mg/L.
By theory analysis, model testing checking and embodiment, analyze, improve the aerobic landfill process of standard that leachate collection layer height is 600～1200mm, can form an effective aerobe filter bed in landfill yard bottom, pass through leachate recycle, the pollution load of fast reducing percolate, improves leachate quality, reduces generation and the treating capacity of percolate, reduce generation and the discharge of methane of foul smell, promote the rapid stabilization of landfill waste.
Claims (1)
1. one kind is accelerated waste landfill method, it is characterized in that, in landfill yard, leachate collection pipe is adopted to non-flowing full setting, the mode that is 12.5-15m according to spacing 25-30m, service radius is arranged air guide gabion, and while making to collect leachate, air can enter into filtrate collecting layer and air guide gabion and to the diffusion of periphery rubbish body from leachate collection pipe, makes in landfill yard in rubbish body subregion in aerobic environment, remainder, in oxygen, the anaerobic environment of holding concurrently, accelerates organic matter degradation, according to method for designing in ordinary biofilter method sewage disposal technology, leachate collection layer height is set, makes leachate collection layer form artificial aerobe filter bed, percolate is carried out to degradation treatment by force simultaneously, collect percolate, in garbage loading embeading process, percolate carries out surperficial recycling spraying simultaneously, and to reduce generation and the treating capacity of percolate, after Closure of landfill site, percolate recycling spraying is in the gas collection layer of Closure cover system bottom, in landfill yard bottom, lay impervious barrier simultaneously, impervious barrier is obliquely installed, impervious barrier lowest part arranges a regulating reservoir, on impervious barrier, table arranges described leachate collection layer, leachate collection layer adopts the gravel that particle diameter is 25-40mm to lay, leachate collection layer is equipped with described leachate collection pipe, leachate collection manifold is always to regulating reservoir top, in landfill yard, adopt described air guide gabion to form a plurality of air guide vertical shafts that lower end communicates with leachate collection layer, above refuse landfill, adopt back jet pipe road to form back spray system, going back to jet pipe road is summarized in regulating reservoir and is provided with water pump and provide hydraulic power for returning spray system, wherein, described leachate collection pipe arranges according to following non-flowing full principle: caliber 200-300mm, and design maximum degree of filling is 0.5, caliber 350-450mm, design maximum degree of filling is 0.6, caliber 500mm and more than, design maximum degree of filling is 0.7, described leachate collection layer height is determined according to following formula:
H=(Q
r.S
0)/(A.N
V) (1)
In formula (1), H---leachate collection layer height, unit is m; Q
r---going back to jet flow Liang， unit is m
3/ d; S
0---percolate COD concentration, unit is g/L, value 6-12g/L rule of thumb during design; A---landfill district area, unit is m
2; N
v---bacteria bed volume COD load, unit is kgCOD/ (m
3while .d) designing, rule of thumb value is 0.1-0.15kgCOD/ (m
3.d);
Described in formula (1), returning the available following formula of jet flow amount calculates:
Q
r=N
S.A
e (2)
In formula (2), A
e---leachate recycle area, unit is m
2; N
s---landfill yard hydraulic load, unit is m
3/ (m
2.d), rule of thumb value is 0.009-0.015m during design
3/ (m
2.d);
Described leachate collection layer height span is 60～120cm.
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| CN104475445A (en) * | 2014-12-10 | 2015-04-01 | 江苏盖亚环境工程有限公司 | Quasi-aerobic type contaminated soil restoration reaction system |
| CN105129990A (en) * | 2015-09-14 | 2015-12-09 | 中国环境科学研究院 | Method for pretreating landfill leachate by quasi aerobiotic landfilling body |
| CN105344702B (en) * | 2015-12-07 | 2018-01-05 | 谢立强 | A kind of residue circulates landfill yard |
| CN108160657A (en) * | 2017-12-26 | 2018-06-15 | 南京万德斯环保科技股份有限公司 | A kind of high-moisture percentage consumer waste landfill percolate original place dystopy processing unit |
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