CN100560238C - Two-step city life garbage burying treatment system and method thereof - Google Patents
Two-step city life garbage burying treatment system and method thereof Download PDFInfo
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- CN100560238C CN100560238C CNB2007100712928A CN200710071292A CN100560238C CN 100560238 C CN100560238 C CN 100560238C CN B2007100712928 A CNB2007100712928 A CN B2007100712928A CN 200710071292 A CN200710071292 A CN 200710071292A CN 100560238 C CN100560238 C CN 100560238C
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Abstract
The invention discloses a kind of two-step city life garbage burying treatment system and method thereof.It is divided into the quick degraded of rubbish and energy and two steps of stabilisation rubbish final disposal with the garbage loading embeading process, this system is mainly by rubbish degrade fast unit, gas collection and clean unit, final landfill unit, the degraded unit is made up of landfill operation unit, degraded and aerogenesis unit, waste stabilisation unit, grog excavation unit and idle unit to be filled out fast, each unit is among the dynamic circulation, and waste layer is comparatively loosened and is full of moisture.The present invention can significantly quicken the degraded and the stabilisation process of application of city life garbage, realize the energy of landfill gas, reduce atmosphere pollution, realize the original position reduction of pollutant in the percolate, can avoid underground water pollution, can save the effective landfill storage capacity and the earthing consumption of refuse landfill simultaneously, the rubbish behind the final landfill is comparatively stable, can avoid the inhomogeneities sedimentation, be convenient to the management of closing.
Description
Technical field
The present invention relates to a kind of two-step city life garbage burying treatment system and method thereof.
Background technology
Percolate and greenhouse gases are the two big pollutants that produce in the city life garbage burying disposal process.Under traditional sanitary landfills mode landfill waste degraded slowly, the heap body is stable to need tens even the centuries, therefore if deal with improperly, percolate and greenhouse gases are with long-term grave danger ecological environment security and health.For reducing the adverse effect of landfill yard to environment, the plan that gradually reduces content of organics in the rubbish was formulated in European Union, made the organic waste amount that enters landfill yard reduce 65% than nineteen ninety-five by 2016.
Over nearly 20 years, bioreactor garbage loading embeading technology is the research focus in this field, and its small scale arrives The field greatly to the laboratory.Studies have shown that in a large number bioreactor garbage loading embeading technology can be quickened junk-heap body stabilisation process, improve gas production, and quicken the sedimentation of heap body.The principal element that influences the bioreactor operational effect has leachate recirculation, rubbish character, acidity adjustment, forced ventilation and weather etc., and wherein moisture is key factor.People such as Dayanthi find to pile the body water-filling can promote hydrolysis and acidifying.The leachate recirculation of souring stage is then helped the improvement of leachate quality to the landfill body that is in the product methane phase.Yet, in actual applications, directly carry out the problem that leachate recirculation may cause that some move, as local ponding, obstruction, especially differential settlement.Studies have shown that the different townm refuses required best leachate recirculation process of degraded fast have nothing in common with each other, so the selection of leachate recirculation process is very difficult.Simultaneously, leachate recirculation can cause progressively compacting of waste layer, is unfavorable for the aerogenesis diffusion, cause landfill gas in the accumulation of waste layer regional area, so the landfill gas of waste layer often needs initiatively to bleed and can be collected.Simultaneously, the landfill gas accumulation area easily forms the short stream of percolate district, makes leachate recirculation efficient reduce greatly.In actual landfill yard, the landfill operation phase often continues the long period, has a large amount of stenches to enter atmosphere therebetween, even if the laggard promoting the circulation of qi body of landfill is collected, also is difficult to the problem of avoiding landfill gas to overflow from overburden layer.Studies show that landfill waste can be degraded fast under the water-filling condition, the rubbish lamination gets the too closely knit degraded that is unfavorable for rubbish.
In a word, there are problems in tradition garbage loading embeading mode and leachate recirculation: (1) organic matter degradation is slow, and the aerogenesis duration is very long, and gas production is little and to discharge wide collection difficulty big, therefore a large amount of landfill gas, stench directly enter environment, destroy atmosphere; Simultaneously, the methane energy runs off serious.(2) landfill waste can not get stablizing for a long time, and garbage degradation produces a large amount of percolates, easily penetrates impervious barrier and polluted underground water.(3) need to consume a large amount of earthing in the garbage loading embeading process, land resource is destroyed seriously, freight is high.(4) landfill body mechanical stability is poor: the rubbish heterogeneity easily causes landfill body differential settlement; For saving effective landfill storage capacity, landfill waste is often pressed too closely knitly, makes the interior gas of heap body be difficult to spread and accumulate, and further hinders the degradation process of the interior rubbish of heap body.
Summary of the invention
The purpose of this invention is to provide a kind of two-step city life garbage burying treatment system and method thereof.
It comprises a plurality of rubbish unit of degrading fast, gas is collected and clean unit, final landfill unit, the rubbish unit of degrading fast comprises the rubbish filling area, ceiling, the gas collection district, air guide port, charging aperture, liquid injection port, leakage fluid dram, discharging opening, blast orifice, ground, perimeter walls, garbage loading embeading district sidewall is provided with perimeter walls, bottom, garbage loading embeading district is provided with ground, the perimeter walls bottom in garbage loading embeading district is provided with a plurality of leakage fluid drams, a plurality of discharging openings, a plurality of blast orifices, top, garbage loading embeading district is provided with the gas collection district, top, gas collection district is provided with ceiling, and ceiling is provided with air guide port, a plurality of garbage inlets, liquid injection port.The described rubbish unit available capacity of degrading fast is 5000～8000m
3
The two-step city life garbage burying processing method is that the landfill process with application of city life garbage is divided into the quick degraded of rubbish and energy and two steps of stabilisation rubbish final disposal, the degraded unit comprises landfill operation unit, degraded and aerogenesis unit, waste stabilisation unit, grog excavation unit, idle unit to be filled out fast, the function of each unit is among the dynamic circulation, at first new refuse is loaded into the landfill district of this unit by the charging aperture of landfill operation unit, the rubbish loading density is 400～450kg/m
3Lasting filling time is 60～100 days, after the rubbish filling finishes, the percolate of waste stabilisation unit is introduced this unit by the liquid injection port of landfill operation unit, make the new refuse layer be full of moisture, then sealing is implemented in this landfill operation unit, collect with gas by the air guide port in gas collection district again and be connected with clean unit, observe the variation of this unit landfill gas generation simultaneously, when gas production is reduced to reduced levels from low to high again, stop to collect gas, finish rubbish degraded and energy fast, then a part of percolate in this unit is incorporated into the new refuse layer of another landfill operation unit, efflux after the residue leachate purification is handled, by air guide port air blast pressurization percolate is extruded from waste layer as far as possible then, drive residual gas in the waste layer by the bottom air blast again, make residual gas enter gas and collect and clean unit, at last stabilisation rubbish is dug out from discharging opening from air guide port, and transfer to final landfill unit, realize the final disposal of stabilisation rubbish.
Benefit of the present invention is: quicken the degraded and the stabilisation of house refuse, collect and utilize methane gas, avoided the atmosphere pollution and the energy to run off; Realized the in-situ treatment of percolate, avoided simultaneously oozing polluted underground water under the percolate; Volume reduces greatly after the waste stabilisation, and the garbage loading embeading amount of the final landfill storage capacity of the unit of making increases greatly, correspondingly also can save the earthing consumption; The degradability of stabilisation rubbish reduces greatly, thereby behind the final landfill, can avoid the inhomogeneities sedimentation, is convenient to the management of closing again.
Description of drawings
Fig. 1 is the two-step city life garbage burying treatment system schematic diagram;
Fig. 2 (a) is the rubbish of the present invention cellular construction front view of degrading fast;
Fig. 2 (b) is the rubbish of the present invention cellular construction vertical view of degrading fast;
Fig. 3 is the daily gas quantitative change process of the embodiment of the invention;
Fig. 4 is the aerogenesis change of component process of the embodiment of the invention;
Fig. 5 is the leachate quality change procedure of the embodiment of the invention;
Among the figure, garbage degradation process 1, aerogenesis is collected pipeline 2, percolate transfer conduit 3, rubbish filling area 4, ceiling 5, gas collection district 6, air guide port 7, charging aperture 8, liquid injection port 9, leakage fluid dram 10, discharging opening 11, blast orifice 12, ground 13, perimeter walls 14.
The specific embodiment
Two-step city life garbage burying treatment system comprises a plurality of rubbish unit of degrading fast, gas is collected and clean unit, final landfill unit, the rubbish unit of degrading fast comprises rubbish filling area 4, ceiling 5, gas collection district 6, air guide port 7, charging aperture 8, liquid injection port 9, leakage fluid dram 10, discharging opening 11, blast orifice 12, ground 13, perimeter walls 14, garbage loading embeading district 4 sidewalls are provided with perimeter walls 14,4 bottoms, garbage loading embeading district are provided with ground 13, perimeter walls 14 bottoms in garbage loading embeading district 4 are provided with a plurality of leakage fluid drams 10, a plurality of discharging openings 11, a plurality of blast orifices 12,4 tops, garbage loading embeading district are provided with gas collection district 6,6 tops, gas collection district are provided with ceiling 5, and ceiling 5 is provided with air guide port 7, a plurality of garbage inlets 8, liquid injection port 9.The described rubbish unit available capacity of degrading fast is 5000～8000m
3The final landfill unit of gas collection and clean unit and rubbish can be with reference to " domestic waste Sanitary Landfill Technology standard " (numbering CJJ 17-88).
The two-step city life garbage burying processing method is that the landfill process with application of city life garbage is divided into the quick degraded of rubbish and energy and two steps of stabilisation rubbish final disposal, the degraded unit comprises landfill operation unit, degraded and aerogenesis unit, waste stabilisation unit, grog excavation unit, idle unit to be filled out fast, the function of each unit is among the dynamic circulation, at first new refuse is loaded into the landfill district 4 of this unit by the charging aperture 8 of landfill operation unit, the rubbish loading density is 400～450kg/m
3Lasting filling time is 60～100 days, after the rubbish filling finishes, the percolate of waste stabilisation unit is introduced this unit by the liquid injection port 9 of landfill operation unit, make the new refuse layer be full of moisture, then sealing is implemented in this landfill operation unit, collect with gas by the air guide port 7 in gas collection district 6 again and be connected with clean unit, observe the variation of this unit landfill gas generation simultaneously, when gas production is reduced to reduced levels from low to high again, stop to collect gas, finish rubbish degraded and energy fast, then a part of percolate in this unit is incorporated into the new refuse layer of another landfill operation unit, efflux after the residue leachate purification is handled, by air guide port 7 air blast pressurization percolate is extruded from waste layer as far as possible then, drive residual gas in the waste layer by the bottom air blast again, make residual gas enter gas and collect and clean unit, at last stabilisation rubbish is dug out from discharging opening 11 from air guide port 7, and transfer to final landfill unit, realize the final disposal of stabilisation rubbish.
Degrade the fast design principle of unit of the present invention
The computing formula of the unit available capacity of degrading fast:
In the formula, v-unit available capacity (m
3), w-service area house refuse day generation (t/d), ρ-rubbish loading density (t/m
3), n-can serve as the quantity of landfill operation unit simultaneously, t-lasting service fate (d).
1) continues determining of service fate
Lasting service fate is meant and fills up a needed time of landfill operation unit, implements sealing to collect landfill gas thereupon.After the rubbish filling hydrolysed ferment effect can take place, and exhausted the oxygen in the waste layer and enter anaerobic state in some days.Then, waste layer can produce foul gas because of deep acidizing, simultaneously methanogen is produced inhibitory action.Generally speaking, begin to occur approximately needs 1～2 month of methane gas in landfill gas, methane content can rise gradually and enters stable product methane phase up to waste layer afterwards, and hot weather can quicken the carrying out of this process.The degraded unit keeps communicating with atmosphere fast in rubbish filling process, for avoiding atmosphere pollution as far as possible and rationally collecting methane, consider the construction investment problem simultaneously, continue the service fate and be advisable with 60～100 days, can suitably shorten summer, and spring, autumn, winter be proper extension then.
2) the rubbish loading density determines
Under traditional land-fill method, garbage truck density generally all is higher than 600kg/m
3Some landfill yard is saving landfill storage capacity, even garbage truck density is increased to 800～1000kg/m
3But discover that the waste layer compacted density is too high to be unfavorable for the gas diffusion, thereby causes gas to accumulate in waste layer.On the one hand, the gas that accumulates can be extruded the percolate in the waste layer, causes the waste layer lack of water and is unfavorable for garbage degradation; On the other hand, the gas that accumulates can be blocked methanogen cell parcel it and contact with organic, thereby suppresses methanogenesis.Therefore, for quickening the degraded of rubbish, should suitably reduce garbage truck density, make waste layer comparatively loose, to guarantee the smooth diffusion of landfill gas, for saving storage capacity, comparatively suitable garbage truck density is 400～450kg/m in quick degraded unit simultaneously
3
3) degrade fast the determining of element number
The total quantity of degraded unit depends on factors such as rubbish rapid stabilization cycle fast.Discover, enter the stable rubbish that produces methane phase behind the high speed aerogenesis that continues 5～6 months, can enter the stabilisation stage substantially.Infer that thus the repeated use cycle of the unit of degrading fast should be about 1 year.The total available capacity of unit of degrading like this, fast must satisfy the processing needs of the house refuse that specific cities and towns service area produces in 1 year.If served fate with 80 days as average continuing, so whole garbage degradation process can be divided into 4～5 stages.In practical operation, for specific cities and towns service area, the day generation of house refuse can be determined substantially, weighs definite quantity and the available capacity thereof that can serve as the landfill operation unit simultaneously again.Consider that from the sealing angle unit of degrading fast needs miniaturization, but can increase element number like this.Given this, degrade the unit available capacity fast with 5000～8000m
3Be advisable, can serve as the quantity of landfill operation unit simultaneously and then be advisable with 2～3.
According to above design principle, for the cities and towns that a daily output rubbish is 100 tons, needing to build available capacity is 5000～8000m
310～15 of quick degraded unit, each unit is furnished with gas gathering system, new refuse charging aperture, stabilisation discharging opening, leachate recirculation and floss hole etc.
The course of work of the present invention
At first, close and seal discharging opening 11, leakage fluid dram 10, the blast orifice 12 of quick degraded unit, application of city life garbage is put into degraded unit fast by charging aperture 8.In rubbish filling process, each charging aperture loadings is basic identical, and gives suitable pressure and make the heap body still be in rarefaction, is beneficial to gas diffusion and garbage degradation.After the rubbish filling finishes, close charging aperture 8, and connect air guide port 7 and utilize system with gas purification, then by liquid injection port 9 and percolate transfer system 3 in the future the percolate of self-stabilization garbage loading embeading unit inject the landfill operation unit, make percolate be full of whole waste layer, close liquid injection port 9 again.At last, make landfill unit be in complete sealing state, to guarantee carrying out smoothly of anaerobic gas generation and gas collection.The whole landfill operation time was advisable with 60～100 days, and can suitably shorten summer, and spring, autumn and winter be proper extension then
Utilize air guide and gas gathering system, the landfill gas that produces in the garbage degradation process is collected.The analytical gas composition utilizes the effective gas purifier, removes compositions such as stench, carbon dioxide, produces purer methane gas as the energy.Simultaneously, observation gas production variation tendency is judged organic degradation process in the unit of degrading fast.When gas production reduced day by day, large amount of organic had been converted into the comparatively stable humus of character.Simultaneously, analyze percolate composition such as volatile organic matter, near when very low when volatile organic content in the percolate, show that rubbish has been in stabilization of state.By leakage fluid dram 10, with a part of stabilisation percolate, be transferred to the landfill operation unit, degrading fast for rubbish on the one hand provides enough moisture, on the one hand new refuse is inoculated methanogen; Simultaneously, can dilute the new refuse percolate to alleviate the inhibitory action of acidization to methanogen.The residue percolate can utilize the external sewage disposal system of heap to carry out purified treatment, effluxes then.
Discharge the percolate that is trapped in the waste layer as far as possible, can as passing through air guide port 7, make waste layer malleation occur, percolate is extruded from leakage fluid dram 10 by external force to the waste layer forced ventilation.Then, to the waste layer forced ventilation, drive the gas that is trapped in the waste layer by blast orifice 12.Open charging aperture 8 and discharging opening 11, the rubbish that is in stable state is dug out, directly enter final landfill unit.After grog dug out, this unit temporarily was in idle state, and need close leakage fluid dram 10 this moment, discharging opening 11, and blast orifice 12 is so that load rubbish next time.
Embodiment
Present embodiment adopts the self-control bioreactor to strengthen the degradation process of application of city life garbage, has mainly investigated aerogenesis situation and leachate quality change procedure.
1) experiment material and method
Reactor is cylindrical, high 150cm, diameter 35cm.According to 2002～2004 years house refuse features in Hangzhou, artificial synthetic simulation rubbish.The rubbish loadings is 39kg (weight in wet base), and loading density is 324.5kg/m
3After the rubbish filling, disposable water filling in reactor makes waste layer be in the water-filling state.On September 25th, 2005, reactor formally started, and winter and spring control indoor temperature is not less than 18 ℃, and all the other times are not controlled room temperature.
2) experimental result
Result of the test is shown in Fig. 3-5.Fig. 3 shows, rubbish in 150 days initial stages of filling gas production rate lower, due to mainly suppressing by low temperature and acidity.After 150 days, along with temperature rising daily output tolerance increases gradually, about 110 days of high speed aerogenesis time remaining, maximum daily output tolerance is 19.6L/d.Fig. 4 shows, after 150 days in the aerogenesis methane content reach more than 55%, show that reactor enters the stable methane phase that produces.When experiment finished, methane accumulative total generation was 1789L.Fig. 5 shows that percolate COD maximum concentration is more than the 30000mg/L, and operation 350 back COD drop to 1500mg/L, and pH rises to more than 6.9.
3) brief summary
Under the water saturation situation, temperature is one of principal element that influences the garbage degradation process.Simulated test shows that the waste stabilisation time needs 1 year approximately, can produce a large amount of methane gas, and the percolate organic loading reduces greatly.Because the analogue reactor diameter is less, is subjected to the influence of outside air temperature very big, the adverse effect of special winter low temperature is more obvious.Under actual landfill situation, organic matter decomposes the heat that produces can be stored in waste layer, thereby keeps heap body higher temperature, and the influence that makes ambient temperature change the heap body diminishes, guarantee carrying out smoothly of garbage degradation process, so the waste stabilisation time should be about 1 year.
Claims (2)
1. two-step city life garbage burying treating apparatus, it is characterized in that comprising a plurality of rubbish unit of degrading fast, gas is collected and clean unit, final landfill unit, the rubbish unit of degrading fast comprises garbage loading embeading district (4), ceiling (5), gas collection district (6), air guide port (7), charging aperture (8), liquid injection port (9), leakage fluid dram (10), discharging opening (11), blast orifice (12), ground (13), perimeter walls (14), garbage loading embeading district (4) sidewall is provided with perimeter walls (14), bottom, garbage loading embeading district (4) is provided with ground (13), perimeter walls (14) bottom in garbage loading embeading district (4) is provided with a plurality of leakage fluid drams (10), a plurality of discharging openings (11), a plurality of blast orifices (12), top, garbage loading embeading district (4) is provided with gas collection district (6), top, gas collection district (6) is provided with ceiling (5), and ceiling (5) is provided with air guide port (7), a plurality of garbage inlets (8), liquid injection port (9).
2. a kind of two-step city life garbage burying treating apparatus according to claim 1 is characterized in that the described rubbish unit available capacity of degrading fast is 5000～8000m
3
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| CN100560238C true CN100560238C (en) | 2009-11-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890420A (en) * | 2010-06-25 | 2010-11-24 | 南京大学 | Landfill gas collecting method and system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285741A (en) * | 2011-04-15 | 2011-12-21 | 桂林理工大学 | Anaerobic leachate zero-emission recharging method capable of accelerating stabilization of fresh refuse |
| CN103065224B (en) * | 2012-12-31 | 2016-03-09 | 雷学军 | A kind of living beings landfill management method |
| CN110576020A (en) * | 2019-08-23 | 2019-12-17 | 广州环投环境服务有限公司 | Method for remedying soil pollution of refuse landfill |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4998486A (en) * | 1989-04-27 | 1991-03-12 | Westinghouse Electric Corp. | Process and apparatus for treatment of excavated landfill material in a plasma fired cupola |
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2007
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4998486A (en) * | 1989-04-27 | 1991-03-12 | Westinghouse Electric Corp. | Process and apparatus for treatment of excavated landfill material in a plasma fired cupola |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890420A (en) * | 2010-06-25 | 2010-11-24 | 南京大学 | Landfill gas collecting method and system thereof |
| CN101890420B (en) * | 2010-06-25 | 2014-01-08 | 南京大学 | Landfill gas collecting method and system thereof |
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