CN102367667A - 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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- CN102367667A CN102367667A CN2011101305840A CN201110130584A CN102367667A CN 102367667 A CN102367667 A CN 102367667A CN 2011101305840 A CN2011101305840 A CN 2011101305840A CN 201110130584 A CN201110130584 A CN 201110130584A CN 102367667 A CN102367667 A CN 102367667A
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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 the consumer waste filling and embedding processing technology field, especially a kind of burying method that quickens the percolate from garbage filling field degraded.
Background technology
At present, the main processing mode of China's domestic waste employing is sanitary landfills.2008, China's domestic waste harmless treatment amount was 10,216 ten thousand tons, and wherein sanitary landfills accounts for 83.8%.In 10 years of future, will there be 1000 middle-size and small-size household garbage sanitary filling fields in China, and newly-increased landfill scale is more than 8,000 ten thousand tons, and day landfill household garbage is above 500,000 tons.
Traditional sanitary landfills is to build impervious barrier in the bottom, the thick gravel of 30cm (cobble) layer is set usually as the leachate collection layer on it, lays vertical air guide gabion by a determining deviation and collects landfill gas, and landfill reaches design height, closes on request.Traditional sanitary filling field garbage degradation is in anaerobic environment basically, thereby has following shortcoming: (1) percolate pollution concentration is high, and it is high to handle investment and operating cost, and intractability is big, and townlet are difficult to bear great number investment and the operating cost that percolate is handled; (2) landfill yard produces foul gas such as a large amount of ammonia nitrogens, hydrogen sulfide, influences 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 no landfill gas value has increased greenhouse gas emissions; (4) landfill yard stabilizing take long (above 40 years), the land reclamation cycle is long.
At present, for solving the problem that above-mentioned landfill technology is faced, mainly contain two kinds of technology modes.
The one, the aerobic landfill technology of standard that proposed by Japanese scholar 70 years last century.The principle of accurate aerobic landfill is the slack flow design through the leachate collection pipe; Under the effect of landfill yard internal-external temperature difference, make air naturally through the terminal landfill yard that gets into of leachate collection pipe; Thereby make rubbish interior section zone be in aerobic state, particularly around percolate gutter and header, have aerobic zone, suppressed the generation of gases such as biogas and hydrogen sulfide; The speed of garbage degradation is improved; Both quicken the stable of rubbish, reduced the discharging of biogas again, 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, through autotelic control device, and the enhancement microbiological process, thus quicken to be prone in the rubbish degraded and medium easy degraded organic component conversion and stable.Different by the method for operation, bioreactor landfill can be divided into anaerobic type (restriction oxygen gets into) and accurate aerobic type (natural ventilation system oxygen supply) and aerobic type types such as (the artificial ventilations).Through the operation of bioreactor landfill, can reduce the percolate pollution intensity, quicken landfill yard and stablize, improve gas yield and gas production rate, reduce the landfill waste disposal cost.For realizing above-mentioned purpose, 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, adjustment, oxygen supply and microbial inoculant etc.
But adopt above-mentioned technical finesse rubbish, because aerobic zone is limited, the 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, quicken the landfill yard waste stabilisation, remain the direction that those skilled in the art make great efforts to study.
Summary of the invention
Not enough to above-mentioned prior art; The technical problem that the present invention will solve is: how a kind of burying method that quickens the percolate from garbage filling field degraded is provided; Make it can reach further raising waste stabilisation speed, improve percolate degradation effect and the purpose that reduces percolate concentration.
In order to solve the problems of the technologies described above, adopted following technical scheme among the present invention:
A kind of burying method that quickens the percolate from garbage filling field degraded, its characteristics are, in landfill yard; The leachate collection pipe is adopted non-flowing full setting; According to service radius is that the mode of 12.5～15m is arranged the air guide gabion, makes that air can enter into the filtrating collecting layer with the air guide gabion and to peripheral rubbish body diffusion from the leachate collection pipe when collecting rubbish filtrating, makes that the subregion is in aerobic environment in the interior rubbish body of landfill yard; All the other zones are in double oxygen, anaerobic environment, quicken organic matter degradation; Simultaneously the leachate collection layer height is set, makes the leachate collection layer form artificial aerobe filter bed, percolate is carried out degradation treatment by force according to the method for designing in the ordinary biofilter method sewage disposal technology; Collect percolate simultaneously, in the garbage loading embeading process, percolate carries out the surface and loops back spray, and after landfill yard closed, percolate looped back the gas collecting layer that is sprayed on closing covering system bottom.
More particularly, in the present technique scheme, lay impervious barrier in the landfill yard bottom earlier; Impervious barrier is obliquely installed, and the impervious barrier lowest part is provided with a regulating reservoir, and table is provided with said leachate collection layer on the impervious barrier; It is the gravel laying of 25～40mm that the leachate collection layer adopts particle diameter; Leachate collection layer bottom is equipped with said leachate collection pipe, and the leachate collection manifold adopts said air guide gabion to form a plurality of air guide vertical shafts that the lower end communicates with the filtrating collecting layer always to the regulating reservoir top in the landfill yard; Above refuse landfill, adopt back the jet pipe road to form go back to the spray system again, time jet pipe road is summarized in the regulating reservoir and is provided with water pump and is back that the spray system provides hydraulic power; Wherein, said leachate collection pipe is provided with according to following non-flowing full principle: caliber 200～300mm, design maximum degree of filling are 0.5; Caliber 350～450mm, design maximum degree of filling are 0.6; More than caliber 500mm reached, the design maximum degree of filling was 0.7; Said filtrating collecting layer height is confirmed according to following formulae design:
H＝(Q
r.S
0)/(A.N
v) (1)
In the formula (1), H---leachate collection layer height, unit are m; Q
r---return the jet flow amount, unit is m
3/ d; S
0---percolate COD concentration, unit is g/L, during design rule of thumb value be 6～12g/L; A---landfill district area, unit are m
2N
v---bacteria bed volume COD load, unit is kgCOD/ (m
3D) when design rule of thumb value be 0.1～0.15kgCOD/ (m
3D);
Return the available computes of jet flow amount described in the formula (1):
Q
r＝N
s.A
e (2)
In the formula (2), A
e---leachate recycle area, unit are m
2N
s---landfill yard hydraulic load, unit are m
3/ (m
2D), during design rule of thumb value be 0.009～0.015m
3/ (m
2D).
In the technique scheme; Said air guide vertical shaft diffuses into the inner passage of rubbish body as passage and the oxygen that rubbish waste gas is derived simultaneously; Said air guide gabion service radius is an air guide vertical shaft service radius, the effective range that refers to collect rubbish waste gas, and how much its value size and air guide gabion diameter and internal clearance factor such as relevant; Concrete method to set up belongs to prior art, and air guide gabion spacing is generally confirmed according to air guide gabion service radius.According to the correlative study result, the oxygen consumption radius of oxygen when landfill waste body 6 horizontal directions spread is about 7.3m, so the air guide gabion arranges that by spacing 25～30m service radius is about 12.5～15m among the present invention.Like this can so that the rubbish body to be in the ratio of aerobic environment and double oxygen, anaerobic environment moderate; Combining to loop back spray technique again; 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 the technique scheme; The passage that can get into as air when can be used as the filtrating conduit according to the leachate collection pipe of non-flowing full principle design; The leachate collection manifold is always to regulating reservoir top place, and the mode discharge opeing of effluenting with non-submersion is to regulating reservoir, thus can with atmosphere; Outside air can pass through blast and hot pressing function, gets into leachate collection layer and air guide vertical shaft from the leachate collection pipe.The concrete laying method of said leachate collection pipe belongs to prior art, generally is to adopt caliber to be not less than the HDPE pipe of 250mm with the main road gathering the place, 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 said each pipeline design maximum degree of filling is an empirical value, adopts this parameter can satisfy the ventilation oxygen supply demand of bacteria bed; Simultaneously, said 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, so all not in this narration.Like this; Airborne oxygen spreads to the rubbish body of leachate collection layer and air guide vertical shaft periphery through power diffusion and dispersion; Make landfill waste body portion zone be in aerobic environment, the part is in double oxygen, anaerobic environment, thereby promotes organic matter to degrade, quicken the stabilizing process of landfill yard fast; Reduce methane, hydrogen sulfide gas generation, reduce foul smell and produce.
In the technique scheme; Said leachate collection layer adopts gravel to lay; Particle diameter is 25～40mm; Formula (1) and formula (2) that design leachate collection layer height adopts are the formula of definite collecting layer height of filtrating in the method for designing that ordinary biofilter and underground sewage percolating are handled in the sewerage treatment.In the formula, the bacteria bed volume COD N that loads
vImmediately refer to leachate collection layer volume COD load, here according to bacteria bed design experiences value.N
sExpression landfill yard hydraulic load causes landfill yard ponding for fear of leachate recycle, and the landfill yard hydraulic load should be less than the permeability of rubbish body.Data shows that the vertical saturated hydraulic conductivity of compacting rubbish is 2 * 10
-5～10
-4Cm/s is equivalent to 17.3～86.4L/ (m
2D).In addition, increase the percolate capacity of returns, help improving the evaporation capacity of percolate, when returning the jet flow amount usually and be 1～3 times of evaporation capacity, can obtain evaporation effect preferably.China's average evaporation capacity in area mostly is 3～5mm/d.So take all factors into consideration the 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 got,
H＝(N
s.A
e.S
0)/(A.N
v) (3)
Leachate recycle area A in the present technique scheme
eEqual landfill district area A, so formula (3 can) is simplified to H=(N
s.S
0)/N
vBring the value range of three parameters into formula calculating again and can know that leachate collection layer height span is 60～120cm; Can satisfy the requirement of bacteria bed processing capacity in this altitude range, in conjunction with the air that the leachate collection pipe imports, can be so that the leachate collection layer forms an artificial aerobe filter bed.After artificial aerobe filter bed is formed on rubbish body bottom.The aerobe filter bed has improved percolate organic matter and treatment of ammonia nitrogen effect to carrying out intensive treatment through the percolate behind the rubbish body.The percolate that contains nitrate is after treatment returned to be sprayed onto in the rubbish body, in the rubbish body is held concurrently oxygen and anaerobic environment, is formed nitrogen by denitrification, thereby reduces the accumulation of ammonia nitrogen, has greatly improved leachate quality.
In addition, in the said technical scheme, said impervious barrier and the concrete structure that goes back to the spray system all belong to ripe prior art, so need not be described in detail and introduce.In the 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 be amount of precipitation more than 1.4 times the time, even can realize that percolate does not efflux in the landfill process.After landfill yard closes,, adopt pipeline to return spray in the covering layer bottom for preventing that rainfall gets into landfill yard in the process of recharging.
The present invention has following advantage:
1. the leachate collection layer height can be greater than traditional landfill percolate collecting layer height; Improve ventilation condition, enlarged the aerobic scope of landfill waste body, promoted organic degraded; Quickened the stabilizing of rubbish; Suppress the generation of hydrogen sulfide, ammonia and methane simultaneously, reduce the foul smell generation, improved the landfill yard surrounding enviroment.
2. the leachate collection layer of bottom 60～120cm; It highly is to obtain according to the method for designing in the ordinary biofilter method sewage disposal technology; Can make the landfill yard bottom form bioreactor---the aerobe filter bed that is similar to bio filter or subsurface seepage flow treatment system; Improved percolate organic matter and treatment of ammonia nitrogen effect, reduced percolate COD and ammonia nitrogen concentration, alleviated follow-up percolate and handled load.
3. percolate loops back and is sprayed onto in the 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 degree, owing to created the condition of biological nitration/denitrification denitrogenation, part nitrogen also is able to remove simultaneously; Thereby the ammonia nitrogen accumulation of having avoided traditional refuse landfill under anaerobic environment, to cause has greatly improved leachate quality.
4. carry out the percolate surface in the landfill process and return spray, utilize the transpiration on landfill yard surface, reduce the generation and the treating capacity of percolate.For the atmospheric evaporation amount is the area of amount of precipitation more than 1.4 times, can realize that percolate does not efflux in the landfill process, need not at landfill yard special percolate treatment facility to be set, and solves that percolate is hard to manage, difficult problems such as investment and operating cost height.Present technique is particularly suitable for the middle refuse of small town landfill that evaporation capacity is big, amount of precipitation is less relatively and disposes.
5. the present invention as the percolate processing unit, saves the leachate collection layer outside percolate and handles occupation of land and expense through increasing the leachate collection layer height; The acceleration stabilizing of landfill waste shortens the management cycle after landfill yard closes, and saves corresponding cost.Therefore the present invention has tangible economic benefit.
Description of drawings
Fig. 1 is the structural representation sketch in the soot of the present invention in the 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 a model test apparatus structural representation of the present invention.
Fig. 4 is that model test apparatus upper strata oxygen concentration changes diagrammatic sketch.
Fig. 5 is that model test apparatus middle level oxygen concentration changes diagrammatic sketch.
Fig. 6 is that model test apparatus lower floor oxygen concentration changes diagrammatic sketch.
Fig. 7 is a model test apparatus percolate COD change in concentration diagrammatic sketch.
Fig. 8 is that model test apparatus percolate ammonia nitrogen concentration changes diagrammatic sketch.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and concrete test examples and embodiment.
Fig. 1 is the structural representation sketch in the soot of the present invention in the garbage loading embeading process.As shown in Figure 1, among the present invention, lay impervious barrier 1 in the landfill yard bottom; Impervious barrier 1 is obliquely installed and at lowest part one regulating reservoir 4 is set; Re-laying particle diameter on the impervious barrier 1 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) confirm; Leachate collection pipe 2 is laid in bottom at leachate collection layer 3.The setting of non-flowing full principle below leachate collection pipe 2 is pressed: caliber 200～300mm, design maximum degree of filling are 0.5; Caliber 350～450mm, design maximum degree of filling are 0.6; More than caliber 500mm reached, the design maximum degree of filling was 0.7.Leachate collection pipe 2 gathers to regulating reservoir 4 tops, and the form that the feasible percolate of collecting effluents with non-submersion enters regulating reservoir 4; The a plurality of air guide vertical shafts that adopt air guide gabion 5 formation lower ends to communicate in the landfill yard with filtrating collecting layer 3; Above refuse landfill, adopt back jet pipe road 7 to form go back to the spray system again, time jet pipe road 7 is summarized in the regulating reservoir 4 and is provided with water pump 9 and is back that the spray system provides hydraulic power.During work, outside air enters in the landfill yard from leachate collection pipe 2 under the powered effect that the msw landfill internal-external temperature difference forms, and rapidly to leachate collection layer 3 and 5 diffusions of air guide gabion, in leachate collection layer 3, forms aerobic environment.Simultaneously oxygen, makes landfill waste body 6 subregions be in aerobic, part and is in double oxygen and anaerobic environment to the rubbish bodies diffusion of leachate collection layer 3 with air guide gabion 5 peripheries through power diffusion and dispersion.According to the correlative study result, the oxygen consumption radius of oxygen when landfill waste body 6 horizontal directions spread is about 7.3m, is the aerobic/accurate aerobic environment of guaranteeing that landfill waste body major part is in, and the air guide gabion arranges that by spacing 25～30m service radius is 12.5～15m.In the garbage loading embeading process, percolate constantly loops back through time jet pipe road 7 and is sprayed on landfill waste body 6 surfaces.
Fig. 2 is the structural representation sketch in the soot of the present invention after garbage loading embeading closes; After landfill yard closes, as shown in Figure 2, on the basis of Fig. 1; Landfill waste body 6 reaches design height; The top of landfill waste body 6 has increased closing covering system 8, and the spray system of returning of returning 7 formation of jet pipe road is positioned at closing covering system 8 inside, and percolate is sprayed on for 7 times in the closing covering system 8 lower gas collecting layers through going back to the jet pipe road.Like this, after garbage loading embeading closed, percolate still constantly looped back and is sprayed onto landfill waste body 6 surfaces; Up to having reached environmental requirement through detection discovery garbage degradation to percolate.
Test examples
Accurate aerobic landfill yard model equipment test according to leachate collection layer height of the present invention, is dwindled by geometrical model, simulates the actual working environment in soot of the present invention, on principle, verifies action effect of the present invention to a certain extent.
(1) experimental rig
Fig. 3 is a model test apparatus structural representation of the present invention.Adopt device shown in Figure 3 to simulate the soot and make an experiment, as shown in the figure, the internal diameter of the experimental rig garbage loading embeading post 10 of employing is 600mm, highly is to establish four groups altogether by 1800mm, is designated as T1, T2, T3 and T4 respectively.The porous leachate collection pipe 2 of a DN50 is all laid in every group of device bottom, and laying respectively with gravel around leachate collection pipe 2 tops reach highly is the leachate collection layer 3 of 60mm, 120mm, 180mm and 240mm.Garbage loading embeading post 10 central authorities are provided with the air guide gabion 5 that diameter is 50mm.The rubbish 6 of landfill highly is 1000mm in the landfill post, is filled to when highly being respectively 250mm (lower floor), 500mm (middle level) and 750mm (upper strata) at rubbish 6, and gas sampling point 11 is set respectively.Every layer is that 1/3 and 2/3 place evenly arranges 8 sampled points at the landfill column radius.When rubbish 6 landfill height reach 1000mm, lay the thick rubble water conservancy diversion layer 12 of 50mm at an upper portion thereof.
(2) test material
Test rubbish is taken from Chongqing gathering station rubbish.The test waste component is: the kitchen is surplus, 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 compacting unit weight of test filling rubbish is about 700kg/m
3
(3) test method and analysis project
Rubbish is sprayed onto rubble water conservancy diversion layer 12 with even the returning of percolate after loading for 2 weeks; Returning the spray frequency is 1 time weekly; Return discharge rate by formula (1) definite by bacteria bed volumetric loading and percolate COD concentration, the volumetric loading of T1, T2, T3 and T4 is controlled to be 0.3,0.15,0.1 respectively, 0.075kgCOD/ (m
3D).Duration of test is to percolate COD, ammonia nitrogen and SO
4 2-Oxygen concentration in concentration and the rubbish body carries out 1 time mensuration weekly.Analysis test method, COD: potassium dichromate method, HACH-COD tester; Ammonia nitrogen: nessler reagent AAS; Sulfate: barium chromate AAS; 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, oxygen concentration changes in the rubbish body
Referring to accompanying drawing 4～6, accompanying drawing 4～6 is respectively that model test apparatus upper, middle and lower layer oxygen concentration changes diagrammatic sketch.The upper strata oxygen concentration is 8.44%～20.11% in the duration of test, garbage loading embeading post, and the 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 upper strata＞middle level＞lower floor.Test started to the 20th week, and oxygen concentration is increases trend gradually, and T2, T3, T4 oxygen concentration totally be higher than the T1 oxygen concentration, showed that increasing the leachate collection layer height helps oxygen and in the rubbish body, spread.After 20 weeks, along with device starts, aerobic, hold concurrently oxygen and the active increase of anaerobe; Oxygen concentration is downward trend gradually; The oxygen concentration aggregate performance is T1＞T2＞T3＞T4, and this possibly be that biomass is many owing to the leachate collection floor height; Aerobic amount is big, thereby has reduced the oxygen amount that in the rubbish body, spreads.Increase the bacteria bed height and help improving the percolate treatment effect.
Oxygen content is higher in the rubbish body, and before 25 weeks, methane content is very low in the rubbish body, and maximum is no more than 2%, and most of sampled point detects less than methane; After 25 weeks, the methane concentration maximum is no more than 24%.H
2S content is also very low, and maximum is no more than 3ppm before 16 weeks, is no more than 0.4ppm after 16 weeks.Result of the test can reduce 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 diagrammatic sketch.The X axle is the time, and unit is week; The Y axle is the percentage composition of oxygen.
Accompanying drawing 5 is that model test apparatus middle level oxygen concentration changes diagrammatic sketch.The X axle is the time, and unit is week; The Y axle is the percentage composition of oxygen.
Accompanying drawing 6 is that model test apparatus lower floor oxygen concentration changes diagrammatic sketch.The X axle is the time, and unit is week; The Y axle 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 diagrammatic sketch.Initial percolate COD concentration is higher, is 60000～70000mg/L, and through returning spray 1 time weekly, COD concentration is obvious downward trend, but the T1 decrease speed is totally slow than T2, T3 and T4.After 29 weeks; The percolate COD concentration of T1, T2, T3, T4 fall reduce to 2130,1705,1835 respectively, 1750mg/L; The COD clearance is respectively 96.86%, 97.19%, 97.30%, 97.34%; Show that increasing the leachate collection layer height helps improving the percolate treatment effect, quickens the organic degraded of rubbish body and stable.
Accompanying drawing 7 is a model test apparatus percolate COD change in concentration diagrammatic sketch.The X axle is the time, and unit is week; The Y axle is a COD concentration, and unit is mg/L.
3, the percolate ammonia nitrogen concentration changes
Accompanying drawing 8 is that model test apparatus percolate ammonia nitrogen concentration changes diagrammatic sketch.The X axle is the time, and unit is week; The Y axle is an ammonia nitrogen concentration, and unit is mg/L.Referring to accompanying drawing 8, shown in it, ammonia nitrogen concentration rises earlier; Be up to 2100mg/L; Descend gradually then, to 27 weeks, the ammonia nitrogen concentration of T1, T2, T3, T4 drops to 127.3,108.4,98.9,111.1mg/L; The situation that ammonia nitrogen raises gradually in the anaerobism landfill yard do not occur, help improving leachate quality.
Embodiment
For further checking effect of the present invention, the applicant in Sichuan refuse landfill field by using the inventive method done verification experimental verification.
The Sichuan refuse landfill is total takes up an area of 42 mu, design storage capacity 10.5 ten thousand steres, the design services time limit 9 years, design average treatment amount 24.2 ton per days.The landfill yard weather belongs to continent, plateau monsoon climate, and is dry, and average for many years rainfall is 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, the run duration leachate recycle is to the rubbish surface, and returning water spray power load is 4.8～6.4L/ (m
2D), be 80% of local water surface evaporation,, realize that percolate zero effluxes, and detects less than CH in the junk-heap body through many commissioning tests half a year
4And H
2S, CO
2And O
2Concentration be about 15.4% and 16.1% respectively, percolate COD concentration is less than 3000mg/L.
Through theory analysis, model testing checking and embodiment analysis, improving the leachate collection layer height is the aerobic landfill process of standard of 600～1200mm, can form an effective aerobe filter bed in the landfill yard bottom; Pass through leachate recycle; Reduce the pollution load of percolate fast, improve leachate quality, reduce the generation and the treating capacity of percolate; Reduce the generation and the discharge of methane of foul smell, promote the rapid stabilization of landfill waste.
Claims (2)
1. a burying method that quickens the percolate from garbage filling field degraded is characterized in that, in landfill yard; The leachate collection pipe is adopted non-flowing full setting; According to service radius is that the mode of 12.5～15m is arranged the air guide gabion, makes that air can enter into the filtrating collecting layer with the air guide gabion and to peripheral rubbish body diffusion from the leachate collection pipe when collecting rubbish filtrating, makes that the subregion is in aerobic environment in the interior rubbish body of landfill yard; All the other zones are in double oxygen, anaerobic environment, quicken organic matter degradation; Simultaneously the leachate collection layer height is set, makes the leachate collection layer form artificial aerobe filter bed, percolate is carried out degradation treatment by force according to the method for designing in the ordinary biofilter method sewage disposal technology; Collect percolate simultaneously, in the garbage loading embeading process, percolate carries out the surface and loops back spray, and after landfill yard closed, percolate looped back the gas collecting layer that is sprayed on closing covering system bottom.
2. the burying method of acceleration percolate from garbage filling field degraded as claimed in claim 1; It is characterized in that lay impervious barrier in the landfill yard bottom, impervious barrier is obliquely installed; The impervious barrier lowest part is provided with a regulating reservoir; Table is provided with said leachate collection layer on the impervious barrier, and it is the gravel laying of 25～40mm that the leachate collection layer adopts particle diameter, and leachate collection layer bottom is equipped with said leachate collection pipe; The leachate collection manifold is always to the regulating reservoir top; Adopt a plurality of air guide vertical shafts that said air guide gabion forms the lower end and the collecting layer of filtrating communicates in the landfill yard, above refuse landfill, adopt back the jet pipe road to form go back to the spray system, time jet pipe road is summarized in the regulating reservoir and is provided with water pump and is back that the spray system provides hydraulic power; Wherein, said leachate collection pipe is provided with according to following non-flowing full principle: caliber 200～300mm, design maximum degree of filling are 0.5; Caliber 350～450mm, design maximum degree of filling are 0.6; More than caliber 500mm reached, the design maximum degree of filling was 0.7; Said filtrating collecting layer height is confirmed according to following formulae design:
H＝(Q
r.S
0)/(A.N
v) (1)
In the formula (1), H---leachate collection layer height, unit are m; Q
r---return the jet flow amount, unit is m
3/ d; S
0---percolate COD concentration, unit is g/L, during design rule of thumb value be 6～12g/L; A---landfill district area, unit are m
2N
v---bacteria bed volume COD load, unit is kgCOD/ (m
3D) when design rule of thumb value be 0.1～0.15kgCOD/ (m
3D);
Return the available computes of jet flow amount described in the formula (1):
Q
r＝N
s.A
e (2)
In the formula (2), A
e---leachate recycle area, unit are m
2N
s---landfill yard hydraulic load, unit are m
3/ (m
2D), during design rule of thumb value be 0.009～0.015m
3/ (m
2D).
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| 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 |
| CN105344702A (en) * | 2015-12-07 | 2016-02-24 | 谢立强 | Recycling landfill for residues |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084368A (en) * | 2013-03-01 | 2013-05-08 | 雷学军 | Flat-ground type biomass landfill |
| 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 |
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| 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 |
| CN114372363A (en) * | 2022-01-05 | 2022-04-19 | 重庆大学 | Landfill aerobic stabilization restoration time-consuming prediction method based on piecewise nonlinear function |
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