CN107876539A - The aerobic Ecosystem restoration system of refuse landfill and method - Google Patents
The aerobic Ecosystem restoration system of refuse landfill and method Download PDFInfo
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- CN107876539A CN107876539A CN201710966433.6A CN201710966433A CN107876539A CN 107876539 A CN107876539 A CN 107876539A CN 201710966433 A CN201710966433 A CN 201710966433A CN 107876539 A CN107876539 A CN 107876539A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
- B09B1/004—Covering of dumping sites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/20—Capture or disposal of greenhouse gases of methane
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The system that the present invention discloses a kind of aerobic restoration of the ecosystem of refuse landfill, including：Gas injection subsystem injects air, oxygen or its mixture into junk-heap body；Pumping subsystem, which extracts the landfill gas in junk-heap body and is sent into landfill gas combustion subsystem, to be burnt；Percolate drawing liquid subsystem of regulating and storing is collected and stores the percolate in junk-heap body；Percolate irrigates subsystem and extracts percolate and re-inject to junk-heap body；The operating condition of Monitor And Control Subsystem real-time monitoring system.The present invention is based on aerobe reaction Treatment process, air or oxygen and percolate etc. are needed to add to landfill yard by controlled manner according to refuses biodegradation in landfill yard, accelerate landfill waste biodegradation and steady rate, leachate recirculation takes full advantage of various microorganisms and moisture, accelerated degradation organic matter in garbage, processing cost is reduced, while utilize landfill yard torch burning technology, landfill gas is focused on, reduces greenhouse gas emission.
Description
Technical field
The invention belongs to landfill restoration technical field, and in particular to a kind of aerobic restoration of the ecosystem system of refuse landfill
System and method.
Background technology
China's Output of Domestic Waste is huge, and with the continuous quickening of Urbanization in China and living standards of the people not
Disconnected to improve, domestic waste yield sharply increases.Counted according to State Bureau of Environmental Protection, China's municipal refuse annual production in 2010 is
1.52 hundred million tons, 2.1 hundred million tons are up to the year two thousand twenty, and with annual 8%~10% speed increase.The continuous growth of rubbish is to city
City's construction etc. brings many problems, and house refuse seems insignificant, if but management and dealing with improperly, unquestionable meeting
Produce many negative effects, it has also become restrict the bottleneck of Chinese Urbanization development process.Landfill due to treating capacity is big, adaptability compared with
By force, investment is low, it is fast to produce effects, operation management is simple and meets the fundamental realities of the country of developing country of China, is current China's processing rubbish
The major way of rubbish.However, it can still produce substantial amounts of landfill gas in refuse landfill stabilization procedures very long after its closing
Body and percolate, by decades from now on or even above in a century constantly to neighbouring public health and environment structure prestige
The side of body.
Outmoded type refuse landfill typically without standardized administration, causes foul smell to overflow, mosquitos and flies growth, and easily trigger bacterium to pass
Broadcast, influence urban health and health；Lack seepage control measure, rainfall infiltration increase diafiltration output of fluid, percolate is to native around
Earth, surface water, groundwater environment pollute；Landfill gas methane containing high concentration (CH caused by rubbish under anaerobic environment4) gas,
It is important greenhouse gases, due to lacking gas guide and collection system, CH4Inorganization release not only aggravates greenhouse effects, also
There is the risk for triggering explosion accident；Garbage corrosion and percolate immersion cause stockyard bottom and Soil Surrounding to pollute, heavy metal and
Organic pollution is exceeded serious.Due to rubbish, degradation speed is very slow under field conditions (factors), garbage stacking yard to public health and
The adverse effect of environment is lasting and progressive, has had a strong impact on the regeneration of landfill yard and Area Land Resources.It is it can be seen that old
Legacy landfill yard ecological reestablishment has important realistic meaning to national economy and living environment.But due to rubbish constituent
Complicated, anisotropism compared with it is strong, regional difference is larger, cause to be difficult to find perfect technology, technique, equipment can quickly handle rubbish
All contaminants in rubbish landfill yard.
The key technology of the safe disposal of outmoded type refuse landfill is aerobic aeration technology, and the key of the technology is to pass through
Gas injection, which makes to be formed in junk-heap body, continues good " oxygen environment ", realizes that the fast degradation of house refuse stabilizes and innoxious.But
The aerobic ventilation research of China's refuse landfill and example are less, and system and technique imperfection, Aerobic Process for Treatment air relatively difficult to achieve exist
It is uniformly distributed in junk-heap body, rubbish processing to be harmless can't be fully achieved, and it is difficult that simple disposal is done after landfill gas extraction
To ensure not produce secondary pollution, ventilation levels are difficult to control in aerobic process, cause inefficient, cost increase.
The content of the invention
It is an object of the invention to propose a kind of aerobic Ecosystem restoration system of refuse landfill and method, improve in landfill yard
Organic matter degradation speed, accelerate landfill yard to reach stabilization of state, solve to ooze existing for outmoded type landfill yard in the prior art
The environmental hazards such as filtrate, foul smell, soil pollution.
Aerobic ecological reestablishment is to fill the built-in some blast pits in region and gas injection well by certain design, is aided in ooze
Pipe, flood pattern are observed and extracted out to filtrate, and air or oxygen is injected into junk-heap body, excludes the gases such as carbon dioxide, methane
Centralized burning is disposed, by air inlet and capacity control and humid control, organic matter in heap body is more than 30% in oxygen content,
Temperature control acts on fast degradation under the conditions of 30~60 DEG C, humidity 30%~45%, through aerobe, reaches in a short time with regard to energy
Stable purpose.The key of the technology is to make to be formed in junk-heap body by gas injection to continue good " oxygen environment ", realizes life rubbish
The fast degradation of rubbish stabilizes and innoxious.Concrete technical scheme is as follows：
A kind of aerobic Ecosystem restoration system of refuse landfill, including gas injection subsystem, pumping subsystem, percolate irrigate son
System, percolate drawing liquid are regulated and stored subsystem, landfill gas combustion subsystem and Monitor And Control Subsystem,
Gas injection subsystem, air, oxygen or its mixture are injected into junk-heap body, it is aerobic anti-in junk-heap body to ensure
That answers is normally carried out；
Subsystem is evacuated, extracts the landfill gas in junk-heap body, and be sent into landfill gas combustion subsystem and carry out at burning
Reason；
Percolate drawing liquid is regulated and stored subsystem, is collected and is stored the percolate in junk-heap body；
Percolate irrigates subsystem, extracts percolate drawing liquid and regulates and stores the percolate stored in subsystem, and notes again
Enter to junk-heap body；
Monitor And Control Subsystem, the operating condition of real-time monitoring system.
As a kind of preferred scheme, gas injection subsystem：Including gas injection blower fan, gas injecting pipe and multiple gas injection wells, each gas injection
Well vertical runs are connected in junk-heap body, and by gas injecting pipe with gas injection blower fan；
It is evacuated subsystem：Including pumping blower fan, pump-line and multiple extraction wells, each extraction well vertical runs are in rubbish heap
In vivo, and by pump-line with pumping blower fan it is connected, the refuse landfill gas of extraction is fed through landfill gas combustion through being evacuated blower fan
Burn subsystem；
Percolate drawing liquid is regulated and stored subsystem：Regulated and stored including blind pipe, percolate elevator pump, percolate conveyance conduit and percolate
Pond, blind pipe are laid in the bottom of junk-heap body, and percolate is delivered to percolate conveyance conduit after blind pipe is collected, and passes through diafiltration
Liquid elevator pump is delivered to percolate storage pond, and percolate storage pond also connects percolate by percolate conveyance conduit and irrigates subsystem
System；
Percolate irrigates subsystem：Including cloth water pump and irrigation conduit, irrigation conduit paving is arranged in junk-heap body surface, leads to
Cross cloth water pump and percolate be delivered to irrigation conduit after storage pond extraction, then by irrigation conduit by percolate to return from top to down
The mode of filling penetrates into junk-heap body；
Landfill gas combustion subsystem：Including burning pretreatment unit and burner, by the pretreatment unit that burns to taking out
The refuse landfill gas that gas subsystem extracts is filtered, moisture removal and desulfurization process, then by burner to pre- place
Refuse landfill gas after reason discharges after carrying out torch burning；
Monitor And Control Subsystem：Well is detected including gas, gas detects well vertical runs in junk-heap body, is configured with humiture
Sensor and gas sampling interface, and field detecting device is connected with, it is online for being carried out to the gas station in junk-heap body
Detect and record, by detecting the gas injection air quantity in data control gas injection subsystem.
As a kind of preferred scheme, gas injection well is laid with blast pit interval.
As a kind of preferred scheme, gas injection well is provided with multiple injecting holes being evenly arranged, and blast pit is provided with multiple equal
The steam vent of even arrangement, and ensure that the pumping hole horizontal on the injecting hole and blast pit on gas injection well is corresponding and arrange, it is more to be formed
Individual horizontal gas passage.
As a kind of preferred scheme, the irrigation conduit paving that percolate is irrigated in subsystem is to be evenly arranged in rubbish heap body surface
The perforated pipe in face.
Buffering area, concentration liquid zone are provided with as a kind of preferred scheme, in the storage pond that percolate drawing liquid is regulated and stored in subsystem
And clear liquid area, buffering area are used to adjust hydraulic load and organic loading, concentration liquid zone is provided with connection percolate and irrigates subsystem
Leachate recirculation delivery port, clear liquid area is provided with supernatant water delivery port.
As a kind of preferred scheme, in landfill gas combustion subsystem, burning pretreatment unit includes the filtering being sequentially connected
Device, blower fan, steam-water separator, dry-type desulfurizing tower and spark arrester；Burner is closed type torch.
As a kind of preferred scheme, Monitor And Control Subsystem also includes the gas sensor positioned at combustion subsystem front end, to entering
The gas for entering landfill gas combustion subsystem carries out on-line checking and recorded, and is taken out by the gas for detecting data control pumping subsystem
Take flow.
As a kind of preferred scheme, Monitor And Control Subsystem also includes the liquid monitoring equipment in percolate storage pond, right
Percolate situation that will be in recharge to junk-heap body carries out on-line checking, record, controls percolate to irrigate by detecting data
The recharge amount of subsystem.
Invention additionally discloses a kind of aerobic ecological restoring method of refuse landfill, using with above-mentioned any one feature
The aerobic Ecosystem restoration system of refuse landfill, air, oxygen or its mixture are injected into junk-heap body by gas injection subsystem,
To ensure being normally carried out for aerobic reaction in junk-heap body；By the landfill gas being evacuated in subsystem extraction junk-heap body, and
It is sent into landfill gas combustion subsystem and carries out burning processing；Collect and store in junk-heap body by percolate drawing liquid subsystem of regulating and storing
Percolate；Subsystem irrigated by percolate extract percolate drawing liquid and regulate and store the percolate that stores in subsystem,
And re-inject to junk-heap body；Pass through the operating condition of Monitor And Control Subsystem real-time monitoring system.
As a kind of preferred scheme, the detection data fed back by Monitor And Control Subsystem control one kind or more of following parameter
Kind, including gas injection air quantity in gas injection subsystem, the gas flow rate in pumping subsystem in pump-line, percolate irrigate subsystem
Diafiltration flow quantity in system in irrigation conduit.
As a kind of preferred scheme, the gas flow rate in pump-line is controlled in 5~10m/s.
As a kind of preferred scheme, diafiltration flow quantity is controlled in 10~20L/ (dm in irrigation conduit2)。
As a kind of preferred scheme, the theoretical oxygen demand amount of junk-heap body aerobic reaction is calculated, controls actual oxygen-supplying amount
It is 1.3~1.5 times of the theoretical oxygen demand amount calculated.
Beneficial effects of the present invention：
(1) present invention makes junk-heap body form one based on aerobe reaction Treatment process by gas injection, pumping
Circulation good " oxygen environment ", aerobic state is converted to by anaerobic state, accelerates organic matter decomposition；It is horizontal using note, exhaust tube
Laying stomata is communicated, forms the gas passage of multiple horizontal directions；Percolate is extracted in heap body bottom simultaneously, improves gas circulation
Efficiency, effectively facilitate new refuse stabilisation.
(2) aerobic reparation uses leachate recirculation, irrigates using surface laying irrigation conduit, not only design is simple, is not easy
Obstruction is easily repaired or safeguarded, and percolate irrigation coverage rate is big, and liquid can steam during being slowly penetrated from junk-heap body top layer
Shampoo point reduces the amount of percolate；Percolate from top to bottom penetrates junk-heap body, and each region utilizes organic matter in percolate, micro-
Biology and moisture, aerobic reaction environment suitable in junk-heap body can be met, realize and stabilize；Also using the " biology of heap body
Filter bed " is acted on, and the macromolecular substances in percolate are trapped in heap body by filtering and suction-operated, percolate is greatly reduced
Pollutant concentration, reduce treatment facility investment cost.
(3) percolate storage pond is designed with the structures such as buffering area, swash plate, can adjust percolate waterpower and organic loading, protects
The efficient and stably of recharge processing to be demonstrate,proved, while percolate is concentrated, bottom high concentration liquid recharge further purifies into heap body,
Percolate is handled by heap body circulation, organic matter in percolate of degrading.If ball float and flexible pipe extract clear liquid in aftertreatment systems,
So that percolate is thoroughly handled.
(4) outmoded landfill gas uncontrollable discharge pollution air, or even produce the danger of spontaneous combustion or blast, aerobic gas injection
And after leachate recirculation, organic matter, microorganism increase, methane production increase sharply, and even up to arrive original twice, the present invention
Rubbish landfill gas is extracted from junk-heap body by way of forcing to extract, and is sent into landfill gas combustion subsystem and incites somebody to action
The landfill gas of centralized collection can be reduced effectively using torch incineration disposal is carried out again after the pretreatment such as filtering, steam-water separation, desulfurization
Landfill gas irregularly secondary pollution caused by discharge, makes outmoded type landfill gas be in overall controllable state, also mitigates
Landfill yard bad-smell problem.
(5) aerobic reparation gas injection air quantity, leachate recirculation amount are adjusted by on-line monitoring in time, controls to adjust junk-heap body
Interior temperature, humidity, amount of oxygen, and record data, assess each stage stable degree；Aerobic process is fully controllable, accelerates to fill out
Garbage degradation speed is buried, shortens the landfill yard land development cycle.
(6) house refuse can be made using the system degraded finishes in or so 2 to 3 years, landfill yard is in a short time
Stabilisation can be reached, it is possible to reduce the maintenance supervision cycle of landfill yard and workload after closing, operating cost is reduced, while can
To reduce the risk of the hazardous gases such as methane blast, and be advantageous to the timely multiplexing in place after administering.The system can not only be used
The rapid stabilization of simple outmoded type refuse landfill after closing and regeneration, it can also be applied to common after closing
Garbage sanitary filling field, apply also for the Construction of Refuse Landfill Yard of sustainable use.
Brief description of the drawings
Fig. 1 is the structural representation of the outmoded aerobic Ecosystem restoration system of type household refuse landfill sites；
Fig. 2 is gas injection well and extraction well artwork；
Fig. 3 is the structural representation of percolate storage pond；
Accompanying drawing marks：1- junk-heap bodies；2- extraction wells；3- gas injection wells；4- pump-lines；5- is evacuated blower fan；6- gases pass
Sensor；7- particulate filters；8- roots blowers；9- steam-water separators；10- dry-type desulfurizing towers；11- roots blowers；12- back-fire reliefs
Device；13- burning torch；14- gas injection blower fans；15- gas injecting pipes；16- irrigation conduits；17- blind pipes；18- percolate storage ponds；
19- liquid monitoring equipment；20- percolate disposal plants；21- cloth water pumps；22- gases detect well；23- field detecting devices；24-
Monitoring system；25- Temperature Humidity Sensors；26- percolate elevator pumps；27- percolate conveyance conduits；28- buffering areas；29- is concentrated
Liquid zone；30- swash plates；31- clear liquid areas；32- leachate recirculation delivery ports；33- clear water delivery ports；34- ball floats and flexible pipe.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment is further described to the specific embodiment of the invention：
As shown in figure 1, a kind of outmoded aerobic Ecosystem restoration system of type household refuse landfill sites disclosed in embodiment, main bag
Include：Gas injection subsystem, pumping subsystem, percolate are irrigated subsystem, percolate drawing liquid and regulated and stored subsystem, landfill gas burning subsystem
System, Monitor And Control Subsystem.
Air, oxygen or its mixture are injected into junk-heap body 1 by gas injection subsystem, to ensure in junk-heap body 1
Aerobic reaction is normally carried out.In the design process of aerobic renovation technique, there is unit according to biodegradable in rubbish first
Point feature, content, the basic data such as factor of created gase calculate the theoretical oxygen demand amount of the aerobic modification technique of junk-heap body.But due to
The closure of outmoded type landfill yard is poor, large quantity of air leakage is had when air is injected into rubbish, it is therefore desirable to take into full account
To the ratio of the actual oxygen content and actual oxygen-supplying amount for participating in aerobic reaction, it is preferred that controllable big into oxygen content in heap body
In theoretical oxygen demand amount about 30%.By make rational planning for oxygen supply state modulator oxygen injection rate, as gas injection well density, power of fan,
Admission pressure etc..
The gas injection subsystem mainly includes gas injection blower fan 14, gas injecting pipe 15 and multiple gas injection wells 3, wherein, gas injection well 3 hangs down
Directly it is laid in junk-heap body 1, is connected provided with multiple aspirating holes, and by gas injecting pipe 15 with gas injection blower fan 14, by air, oxygen
Gas or its mixture are injected into junk-heap body 1 by the effect of gas injection blower fan 14, and can control gas injection by gas injection blower fan 14
Air quantity, gas injection blower fan 14 can use high pressure blower.By the gas injection wind of the data point reuse gas injection blower fan 14 of Monitor And Control Subsystem feedback
Amount.
Pumping subsystem is used for extracting landfill gas in junk-heap body, main gas including aerobic reaction generation and not
The injection gas of reaction, and centralized collection is sent into and burns subsystem disposal.Amount and aerobic reaction according to caused by rubbish landfill gas
Carry out process, may be selected force extraction mode.
The pumping subsystem mainly includes pumping blower fan 5, pump-line 4 and multiple extraction wells 2, the vertical runs of extraction well 2
In junk-heap body 1, it is connected provided with multiple aspirating holes, and by pump-line 4 with pumping blower fan 5, pumping blower fan 5 utilizes negative pressure
The landfill gas in junk-heap body is extracted to pump-line 4, and concentrates and is delivered to landfill gas combustion subsystem.By calculating and designing
The internal diameter and rice number of pump-line, the gas flow rate in pump-line 4 is preferably controlled in 5~10m/s.The material of pump-line 4
It is preferred that high density polyethylene pipe (HDPE), through primary Calculation, 10 hectares of landfill yard is about taken out using HDPE pipeline landfill gas
Feed channel 1800m.
With reference to shown in Fig. 2, gas injection well and extraction well in the system use alternate arrangement, to ensure gas in garbage loading embeading
Optimal migration and reaction effect in unit.Due to being commonly present fresh charge of plastic, tire, clothes fiber and braid in landfill yard
Deng easily causing obstruction, winding, be unfavorable for gas flowing, pumping efficiency is low.Therefore, can be by gas injection well as a kind of preferred scheme
The corresponding laying of pumping hole horizontal on injecting hole and extraction well 2 on 3, forms multiple upper and lower distribution horizontal gas passages, by force
Change the gas flowing in heap body.
Percolate irrigates subsystem and percolate is injected into rubbish, and the gas of injection can be air, oxygen or its mixing
Thing, to ensure the good condition of aerobic reaction.Percolate is irrigated subsystem and filled using leachate leaking mode in embodiment
Irrigate.
Percolate, which irrigates subsystem, mainly includes cloth water pump 21 and irrigation conduit 16, wherein, irrigation conduit 16 is uniformly laid
On the top layer of junk-heap body 1, percolate is delivered to cloth water pump 21 by cloth water pump 21 after the extraction of storage pond 18, then by cloth water pump 21
Each irrigation conduit 16 is branched to, percolate is then carried out by water distribution by irrigation conduit 16, oozed in a manner of spraying from top to down
Enter junk-heap body 1.16 preferred perforated pipe of irrigation conduit, is easy to percolate water distribution uniformity.
This irrigation method employed in embodiment is relative to deep well injection mode commonly used in the prior art, percolate
Sphere of action is wider, better, and percolate evenly can be distributed in junk-heap body, improves waste stabilisation efficiency；Diafiltration
Liquid from top to bottom penetrates junk-heap body, and each region utilizes organic matter, microorganism and the moisture in percolate, using moisture evaporation
Diafiltration liquid measure is reduced, while can also meet aerobic reaction environment suitable in junk-heap body, realizes and stabilizes；Relative to sprinkling irrigation etc.
Recycling mode, foul smell when reducing percolate sprinkling escape, and effect on environment is smaller.
In the process, the humiture situation in junk-heap body can be also real-time monitored by gas detection well 22, is passed through
Adjust cloth water pump 21 and control diafiltration flow quantity in irrigation conduit 16, control humidity in junk-heap body to be maintained at 30%~45%.This
Outside, because percolate irrigates subsystem by the way of percolate penetrates whole landfill yard, by the percolate in irrigation conduit 16
Flow is controlled in 10~20L/ (dm2), water rate control ensures percolate layering, and higher concentration percolate returns to heap body, heap body
The effect purification percolate of " bacteria bed ", constantly circulates dope and gradually reduces leachate contamination degree.
Percolate drawing liquid subsystem of regulating and storing mainly by blind pipe 17, percolate elevator pump 26, percolate conveyance conduit 27 and oozes
Filtrate storage pond 18 forms.Wherein, blind pipe 17 is laid in the bottom of junk-heap body 1, for drawing percolate, the one of blind pipe 17
End extend out to outside junk-heap body and accesses percolate storage pond 18 by percolate conveyance conduit 27, the rubbish collected through blind pipe 17
Rubbish percolate is pumped into percolate storage pond 18 by percolate elevator pump 26.
Poor garbage landfill yard does not configure leachate collection system generally, or simply simply in the low water of refuse landfill
Flat place has diafiltration liquid pool, and is collected by laying blind pipe concentration in bottom.With reference to shown in Fig. 3, it is provided with embodiment
Special percolate storage pond 18, percolate storage pond 18 is interior to be provided with buffering area 28, concentration liquid zone 29 and clear liquid area 31, passes through swash plate
30 separate.The upper strata of swash plate 30 is clear liquid area 31, and lower floor is concentration liquid zone 29, using percolate Action of Gravity Field itself, then
There is the lasting drawing liquid of leachate recirculation delivery port 32 plus concentration liquid zone 29, there is provided mobilization dynamic, percolate pass through the weight of swash plate 30
Power concentration separates.Percolate is collected from blind pipe 17 using percolate elevator pump 26, then from percolate storage pond 18
The buffering area 28 that bottom enters in percolate storage pond 18.Hydraulic load and organic loading are adjusted by buffering area 28, is recycled
Shallow pool theory by percolate gravity concentration, concentrates the liquid of liquid zone 29 from the leachate recirculation delivery port in bottom of pond portion using swash plate 30
32 continuous extractions, ball float and flexible pipe 34 are laid in clear liquid area 31 by top, according to water quality monitoring situation periodically from clear water delivery port 33
Discharge clear liquid and carry out subsequent treatment in diafiltration liquid processing device 20.
Often containing pernicious gases such as methane in landfill gas, in the prior art, to landfill gas caused by junk-heap body is led to
It is often directly outer to arrange and without any processing or only do simple adsorption treatment, and after aerobic ventilation or leachate recirculation, landfill gas
It will roll up in regular period, some place methane concentrations at initial stage are even double, easily set off an explosion, certainly if do not dealt carefully with
Combustion, contaminated site environment.If directly carrying out incineration disposal to landfill gas, the main component of these pernicious gases is methane and dioxy
Change carbon, also containing sour gas such as certain moisture and hydrogen sulfide, if directly burning air can not only be polluted, for a long time with
Toward also corrosion failure can be caused to pump-line and combustion apparatus, therefore, it is necessary to carry out it before landfill gas burning
Pretreatment.
In embodiment, landfill gas combustion subsystem mainly includes burning pretreatment unit and burner, wherein, burning is pre-
Processing unit includes particulate filter 7, roots blower 8, steam-water separator 9 and the dry-type desulfurizing tower 10 being sequentially connected, and uses respectively
Pump in landfill gas, particle filtering, dewatered clean, desulfurization process；Burner includes roots blower 11, spark arrester 12 and combustion
Make a fire torch 13.Wherein, spark arrester 12 is used to control torch safe combustion.Blower fan in combustion subsystem is roused using large-scale Roots
Blower fan is concentrated to gas gathering system and is evacuated, and ensures 20kPa negative pressure in gas well, can with the landfill gas ensured in junk-heap body
To smoothly enter extraction well 2.
Tail gas concentration in landfill yard is extracted by the pumping blower fan 5 in pumping subsystem and delivers to landfill gas combustion subsystem, is filled out
Bury gas combustion subsystem mainly realize gas is pumped, filtered, dewatered clean, desulfurization, burning etc., pass through and force to extract
Mode rubbish landfill gas is extracted from junk-heap body 1, and be sent into landfill gas combustion subsystem.Specifically, through extracting
The landfill gas gone out enters burning pretreatment unit by pump-line 4 and carries out the pre- places such as particle filtering, dewatered clean, desulfurization process
Reason, then by roots blower take out 11 and deliver to burner and carry out burning processing.Wherein, pumping blower fan 5 can use roots blower,
Centrifugal blower etc. can be used.
《Household refuse landfill sites landfill gas collects processing and utilizing works technical specification》(CJJ133-2009) provided in
" when landfill gas collecting amount is more than 100m3During/h, closed type torch should be set ", using closed type torch, landfill gas is sealing
Burning in enclosed torch is carried out in a temperature control storehouse, there is very big elimination to imitate the methane in landfill gas
Rate (can reach 99%).Torch has blowout protection, power outage security protection and tempering safety protection function, easy to operate, operation
Safety, in the case of unexpected power-off, the acceleration switching valve of torch automatically cuts off tail gas supply.Therefore in embodiment, burning torch
13 use closed type torch, and landfill gas after pretreatment is pumped to burning torch 13 through roots blower is burnt, so as to
Thoroughly remove rubbish landfill gas caused by heap body 1.By the processing of landfill gas combustion subsystem, pump-line and burning can be made
Equipment has longer service life, safeguards system normal work.
30~40mm cobble (CaO content is relatively low) is filled into particulate filter 7, when gas passes through particulate filter 7
When, because the gap between cobble is by the impurity retention in gas, and moisture can then be condensed on cobble surface, and pass through particle
The water collector of the lower section of filter 7 collects discharge.
Certain density hydrogen sulfide (H is usually contained in refuse landfill gas2S), its concentration is often in 1000~6000ppm
Between, the method for dry type desulfurizing can be used to be handled.Desulfurizing agent is filled in dry-type desulfurizing tower 10, and biogas and desulfurizing agent connect
The hydrogen sulfide in gas is removed after touch, and by blasting oxygen, desulfurization is carried out simultaneously with regenerative response, and desulfurizing agent actually serves
Catalytic action, desulfuration efficiency can reach more than 90%.
Because landfill gas humidity is higher, be readily generated under the conditions of having existing for sour gas the hydrogen of severe corrosive from
Son, therefore, also need to carry out moisture removal to landfill gas using steam-water separator 9.Cooler parallel connection can specifically be used to landfill
Gas carries out cooling treatment, and water is removed from saturated air.
Further, the system can also be by monitoring subsystem to each seed ginseng relevant with aerobic reparation in refuse landfill
Number is monitored and detected, according to monitoring and testing result, to adjust various control parameters in time, make aerobic reaction quick, steady
Surely carry out.
The Monitor And Control Subsystem includes gas detection well 22, liquid monitoring equipment 19 and gas sensor 6, wherein, gas inspection
Well logging 22 is used to monitor temperature, humidity, garbage loading embeading gas concentration and the major gaseous component (CO in refuse landfill2、CH4、O2、
N2、CO、H2S etc.) pressure etc.；Liquid monitoring equipment 19 be used to monitoring the composition of percolate, COD, BOD,
Ammonia nitrogen, pH value etc.；Gas sensor 6 is used for oxygen concentration, gas pressure, temperature, the humidity for detecting combustion system forward end gas
Deng to control landfill gas combustion system operating mode.
Specifically, gas detects the vertical runs of well 22 1 in junk-heap body, it is gentle that inside is configured with Temperature Humidity Sensor 25
Sampler body interface, gas sampling interface connection field detecting device 23 are therefore, measurable including gas by gas-monitoring well 22
Concentration, temperature, the parameter such as the numerical value such as humidity, feedback adjustment gas injection tolerance, diafiltration flow quantity, to control oxygen content in heap body big
In 30%, temperature is in 30~60 DEG C, aerobic condition of the humidity 30%~45%.Before gas sensor 6 is laid in combustion system
End, i.e., between pumping blower fan 5 and burning pretreatment unit, to concentrating into the pending burning processing of gas of pump-line
Gas institute's on-line checking and oxygen concentration, gas pressure, temperature, humidity condition that it includes are recorded, to control landfill gas to burn
System condition.Liquid monitoring equipment 19 stretches to the bottom of percolate storage pond 18, and measurable concentration liquid zone 29 and clear liquid area 31 go out
Water quality situation at the mouth of a river, can to will be in recharge to junk-heap body percolate situation detected and recorded in real time, with the palm
The water quality situation of recharge percolate is held, and controls recharge water.
In above-described embodiment, all blower fans, water pump, measuring instrument etc. are uniformly controlled by automatically controlled in monitoring system 24,
Specific control principle and method analysis uses prior art, is not belonging to the emphasis of the present invention, here is omitted.
As fully visible, the present invention is based on aerobe reaction Treatment process, by air or oxygen and percolate etc., root
Needed according to refuses biodegradation in landfill yard, added to landfill yard, aerobic reaction and greatly speeded up by a kind of controllable mode
Landfill waste is biodegradable and steady rate, leachate recirculation take full advantage of various microorganisms and moisture, accelerated degradation rubbish
Middle organic matter, leachate contamination intensity and processing cost can be also reduced, while utilize landfill yard torch burning technology, focused on
Landfill gas, reduce maximum greenhouse gases --- the discharge of methane of harm.
Further, the implementation case is tested in an outmoded type refuse landfill for taking up an area 9.4 ten thousand square metres, fills rubbish
Rubbish is more than 900,000 tons, about 10 meters of landfill depth.Place is explored, underground colority of water in the landfill yard, COD, BOD, total phosphorus,
Total nitrogen, ammonia nitrogen and excrement colibacillus group are exceeded serious, and stockyard periphery surface water COD, BOD, total nitrogen, ammonia nitrogen are in bad V classes, in soil
Heavy metal pollution is exceeded (to be higher than the higher limit of soil grade III Standard (GB15618-1995), and accordingly contains more than coating soil
Amount), region landfill gas is exceeded serious (methane gas multi-point is higher than 40%), and the outmoded landfill yard is entered using present system
Row is administered.
It is smooth to landfill yard surface progress using bull-dozer, uniformly lay gas injection well 100, extraction well in landfill yard
100, and be laid staggeredly.Managed from DN800mm PE, uniform pore openings on pipeline, down tube adjusts lower well depth according to landfill depth
It is shallow, keep each aspirating hole to there is injecting hole into horizontal circulation status, to improve gas permeability in junk-heap body, respectively from DN therewith
100th, 200,300 PE pipes collect conveying gas, lay pipeline to landfill gas CIU.Biogas monitoring is laid in the venue
Well, groundwater observation well, settlement observation point.Uniformly lay simple percolate water inlet pipe, water-supply-pipe, perforated pipe in landfill yard surface
And miscellaneous part, irrigated for percolate.Carry out enclosing and rainwater guide facility in whole place.
After landfill field device installs, control gas injection blower fan injects certain amount of air or oxygen, air exhauster into gas injection well
Extract landfill gas concentration and be delivered to landfill gas CIU.Gas flow rate in the pump-line of the landfill yard takes 5~10m/s,
Internal diameter choosing then 250mm, and choose HDPE pipes.Landfill gas is trapped through particulate filter, impurity, and moisture can be on filling cobble surface
Collected and discharged by water collector after condensation.Enter dry-type desulfurizing tower after filtering, use Fe2O3The sulphur in landfill gas is removed for desulfurizing agent
Change hydrogen, will bury gas moisture removal by subcooler, and be sent into biogas incineration torch.Torch is cylindrical tower structure, and regulation is negative
Lotus is than 100~2500m3/ h, tail gas is disposed suitable for landfill yard restoration of the ecosystem whole process.Torch has automatic ignition and flue gas temperature
The functions such as the control of degree, can under the bad weather conditions such as heavy rain steady operation.
Percolate is collected by blind pipe, through whole field bottom, is laid with the axis of field bottom being tap drain, on tap drain according to
Zhigou is set away from 30-50m, collection conduit is arranged to straight length and is transported to percolate storage pond.Percolate enters head piece and is placed in diafiltration
Liquid storage pond bottom, the other end bottom in pond set liquid pumping hole, control flow velocity in pond, percolate is through gravity concentration, by concentrate
Recharge is extracted, initial leachate COD exceedes 5000mg/L, and supernatant can be reduced to 2000mg/L after recharge 6 months, monitoring
Water quality situation, supernatant is discharged according to the design conditions of follow-up diafiltration liquid processing device.Supernatant discharge is taken out by ball float, flexible pipe
Take, diafiltration liquid processing device outer can not clear liquid when not running, until leachate tail water terminate to transport outward inorganic content it is higher
Remaining percolate.
Based on the aerobic repair system of landfill yard proposed by the invention, in practical application, being broadly divided into three phases：
Landfill yard aerobic reparation early stage, heap body are in oxygen supply deficiency, and are percolated the higher situation of liquid hold-up, work as on-line monitoring
Oxygen concentration be less than setting oxygen concentration low value 5%, when humidity is more than setting humidity high level 70%, then On-line Control gas injection blower fan is opened
Gas injection rate is opened or increases, drawing liquid amount is opened or increased to percolate drawing liquid pump, and small pump reduces output.
The aerobic reparation mid-term of landfill yard, in the pyroreaction stage, oxygen demand is also higher, appropriate stronger ventilation amount and ventilation
Frequency with ensure microorganism oxygen demand and control junk-heap body temperature.When rubbish heap body temperature is higher than preference temperature high level 70
DEG C, when oxygen content is less than arranges value 5%, then On-line Control gas injection blower fan is opened or increase gas injection rate, small pump increase output.
In the landfill yard aerobic reparation later stage, junk-heap body temperature is relatively low, microorganism oxygen demand relative reduction.To remain higher
Garbage degradation efficiency, the appropriate higher limit and lower limit for reducing oxygen concentration setting value, reduces gas injection frequency, prevents because gas injection rate is inclined
Height reduces temperature.With reference to the common control technique of multi-parameter air water, i.e., using water quality, the multiple parameters monitored in real time of gas station,
Gas pumping amount, Liquid return filling amount are adjusted, realizes the regulation and control of the conditions such as moisture content in junk-heap body, oxygen concentration and temperature, simultaneously
Moisture content, oxygen concentration and temperature Always Online" is completed to monitor and automatically save corresponding data and export all parameters, Jin Erfen
Analyse waste stabilisation state.
Carry out aerobic restoration of the ecosystem 10 months in the landfill yard, gas well operation and aerobic degradation situation are detected, by repairing
After multiple, the landfill yard basically reaches stable state.
As fully visible, the present invention optimizes improvement to aerobic ventilating system, by the circular treatment of percolate, adds
Prompt drop solution organic matter in garbage, while reduce percolate total amount, reduce its pollutant concentration；And utilize landfill yard torch burning skill
Art, focus on landfill gas；Landfill Stabilization Rate state is grasped by monitoring control technique on-line, adjusts aerobic work in time
Condition so that aerobic ventilation is stable, Effec-tive Function.Aerobic Ecosystem restoration system is used not only for simple outmoded type rubbish after closing
The rapid stabilization of landfill yard and regeneration, the common garbage sanitary filling field after closing can also be applied to, can also be applied
In the Construction of Refuse Landfill Yard of sustainable use.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of aerobic Ecosystem restoration system of refuse landfill, it is characterised in that including gas injection subsystem, pumping subsystem, ooze
Filtrate is irrigated subsystem, percolate drawing liquid and regulated and stored subsystem, landfill gas combustion subsystem and Monitor And Control Subsystem；
Gas injection subsystem, air, oxygen or its mixture are injected into junk-heap body；
Subsystem is evacuated, extracts the landfill gas in junk-heap body, and be sent into landfill gas combustion subsystem and carry out burning processing；
Percolate drawing liquid is regulated and stored subsystem, is collected and is stored the percolate in junk-heap body；
Percolate irrigates subsystem, extracts percolate drawing liquid and regulates and stores the percolate stored in subsystem, and re-inject to
In junk-heap body；
Monitor And Control Subsystem, the operating condition of real-time monitoring system.
2. the system as claimed in claim 1, it is characterised in that
Gas injection subsystem：Including gas injection blower fan, gas injecting pipe and multiple gas injection wells, each gas injection well vertical runs are in junk-heap body
It is interior, and be connected by gas injecting pipe with gas injection blower fan；
It is evacuated subsystem：Including pumping blower fan, pump-line and multiple extraction wells, each extraction well vertical runs are in junk-heap body
It is interior, and be connected by pump-line with pumping blower fan, the refuse landfill gas of extraction is fed through landfill gas burning through being evacuated blower fan
Subsystem；
Percolate drawing liquid is regulated and stored subsystem：Including blind pipe, percolate elevator pump, percolate conveyance conduit and percolate storage pond,
Blind pipe is laid in the bottom of junk-heap body, and percolate is delivered to percolate conveyance conduit after blind pipe is collected, and passes through percolate
Elevator pump is delivered to percolate storage pond, and percolate storage pond also connects percolate by percolate conveyance conduit and irrigates subsystem
System；
Percolate irrigates subsystem：Including cloth water pump and irrigation conduit, irrigation conduit paving is arranged in junk-heap body surface, passes through cloth
Percolate is delivered to irrigation conduit by water pump after storage pond extraction, then by irrigation conduit by percolate with recharge from top to down
Mode penetrates into junk-heap body；
Landfill gas combustion subsystem：Including burning pretreatment unit and burner, by the pretreatment unit that burns to pumping
The refuse landfill gas that system extracts is filtered, moisture removal and desulfurization process, then by burner to pretreatment after
Refuse landfill gas carry out torch burning after discharge；
Monitor And Control Subsystem：Well is detected including gas, gas detects well vertical runs in junk-heap body, is configured with temperature and humidity sensing
Device and gas sampling interface, and field detecting device is connected with, for carrying out on-line checking to the gas station in junk-heap body
And record.
3. system as claimed in claim 2, it is characterised in that：The gas injection well is laid with blast pit interval.
4. system as claimed in claim 2, it is characterised in that：The gas injection well is provided with multiple injecting holes being evenly arranged,
Blast pit is provided with multiple steam vents being evenly arranged, and ensures the pumping hole horizontal on the injecting hole and blast pit on gas injection well
Corresponding arrangement, to form multiple horizontal gas passages.
5. system as claimed in claim 2, it is characterised in that：The irrigation conduit paving that the percolate is irrigated in subsystem is equal
The even perforated pipe for being arranged in junk-heap body surface.
6. system as claimed in claim 2, it is characterised in that：Set in the storage pond that the percolate drawing liquid is regulated and stored in subsystem
There are buffering area, concentration liquid zone and clear liquid area, buffering area is used to adjust hydraulic load and organic loading, and concentration liquid zone is provided with connection
Percolate irrigates the leachate recirculation delivery port of subsystem, and clear liquid area is provided with supernatant water delivery port.
7. system as claimed in claim 2, it is characterised in that：In the landfill gas combustion subsystem, burn pretreatment unit
Including filter, blower fan, steam-water separator, dry-type desulfurizing tower and the spark arrester being sequentially connected；
Burner is closed type torch.
8. system as claimed in claim 2, it is characterised in that：The Monitor And Control Subsystem also includes being located at combustion subsystem front end
Gas sensor, the gas for entering landfill gas combustion subsystem on-line checking and record.
9. system as claimed in claim 2, it is characterised in that the Monitor And Control Subsystem also includes in percolate storage pond
Liquid monitoring equipment, to will be in recharge to junk-heap body percolate situation carry out on-line checking, record.
10. a kind of aerobic ecological restoring method of refuse landfill, it is characterised in that using such as claim 1 to 9 any one institute
The system stated, air, oxygen or its mixture are injected into junk-heap body by gas injection subsystem, it is good in junk-heap body to ensure
Oxygen reaction is normally carried out；By the landfill gas being evacuated in subsystem extraction junk-heap body, and it is sent into landfill gas burning subsystem
System carries out burning processing；Collect by percolate drawing liquid subsystem of regulating and storing and store the percolate in junk-heap body；Pass through
Percolate, which irrigates subsystem and extracts percolate drawing liquid, regulates and stores the percolate stored in subsystem, and re-injects to rubbish heap
In vivo；Pass through the operating condition of Monitor And Control Subsystem real-time monitoring system.
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