CN104259173A - H2S endogenesis cutting-down method and device of quasi aerobic landfill - Google Patents
H2S endogenesis cutting-down method and device of quasi aerobic landfill Download PDFInfo
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- CN104259173A CN104259173A CN201410354102.3A CN201410354102A CN104259173A CN 104259173 A CN104259173 A CN 104259173A CN 201410354102 A CN201410354102 A CN 201410354102A CN 104259173 A CN104259173 A CN 104259173A
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Abstract
The invention discloses an H2S endogenesis cutting-down method and device of a quasi aerobic landfill. The device comprises a reactor shell, an adjusting tank, a recharge pump, a vertical gas guide and exhaust pipe, a plurality of vertical type recharge wells and a horizontal recharge net. A fine sand cover layer, a garbage layer, a gravel layer and a percolate layer are arranged in the shell; the vertical gas guide and exhaust pipe is arranged at the central position of the reactor shell and penetrates through the fine sand cover layer and the garbage layer; the vertical type recharge wells are arranged around the vertical gas guide and exhaust pipe, water outlets of the vertical type recharge wells extend to the positions with different heights in the garbage layer, and top inlets of the vertical type recharge wells are communicated with the adjusting tank through the recharge pump; the horizontal recharge net is arranged in the garbage layer and is communicated with the adjusting tank through the recharge pump. According to different separated areas in the quasi aerobic landfill, target recharge of percolates is carried out, rich iron resources in the landfill are fully utilized, the biological oxidoreduction cycling of iron can be achieved through the physical, chemical and biological process inside the landfill, and therefore the endogenesis cutting-down aim of the H2S can be achieved.
Description
Technical field
The present invention relates to the process field of solid waste, specifically refer to that a kind of biological chemistry action based on iron in landfill yard is to H
2the endogenous cutting method of S stench and device.
Background technology
The processing method of domestic waste is a lot, and landfill disposal technology, because construction investment is few, operating cost is low, technical requirement is not high and can reclaim the advantages such as landfill gas (biogas), is current major garbage processing mode both domestic and external.According to statistics, in current China urban garbage disposal, landfill disposal amount arrives more than 60%, the national conditions of China and the characteristic of domestic waste also determined within the quite a long time from now on, and landfill is still the major way of present stage China's urban garbage disposal.Along with city size constantly expands the fast increasing with generation, some refuse landfills of China are surrounded by residential block just gradually, and the stench of refuse landfill disturbs residents becomes one of the widest environmental hazard of public's complaint.
H
2s is typical odorant, colourless and have excitant and asphyxiant rotten egg smell, and be slightly soluble in water, its odor threshold is extremely low, is 0.5ppb.Be exposed to H
2all kinds of eye, respiratory tract and neurogenic disease can be caused, even shock death in S environment, very large to the healthy harm of workman and nearby residents.So, the H of effective disposal of refuse landfill yard
2s odor pollution, reduces its broken ring to periphery ecological environment, and the protection people's is healthy, has become the important content of the refuse landfill comprehensive regulation.
At present, refuse landfill H
2s odor pollution control technology mainly contains Physical, chemical method and bioanalysis, based on end treatment, comprises charcoal absorption, water washing, photochemical catalytic oxidation, ozone oxidation, biofiltration and activated sludge process etc.Wherein, physical method has the advantages such as simple to operate, instant effect, but this method only suitable treatment low concentration, odorant among a small circle, and cost high, there is secondary pollution.Chemical method has the features such as efficiency is high, applied widely, but the method exists the defects such as deodorizing facility investment is high, operating cost is expensive, the duration is short.Biological odor removal method has the features such as technique is simple, with low cost, but there is screening and the domestication difficult problem of high-effective microorganism.
Iron is the variable valency metal that biosphere the most often utilizes, and extremely abundant at landfill yard intensive amount, landfill yard is described as " third place in the world great Tie Ku ".Iron can realize the conversion between divalence, trivalent under chemistry and biological effect, and ferrous iron can directly and H
2s reaction directly generates ferrous sulfide precipitation, and ferric iron also can by H
2s is oxidized to elemental sulfur, reduction formed ferrous iron again can with H
2s effect generates precipitation.In addition, a large amount of dissimilatory iron reduction bacterium is also there is in landfill yard, under these microbial actions, the alienation iron process of microorganism can be coupled organic oxidative degradation, both electron donor can be competed with sulfate reducing bacteria, suppress the generation of hydrogen sulfide, the iron compound of formation can also change the existence of hydrogen sulfide, reduces the release of hydrogen sulfide.
On the whole, through research and probe in recent years, at landfill yard H
2s odor prevention has technically achieved certain achievement, but these methods mainly concentrate on end-of-pipe control, lacks effective Sources controlling means.The nutriment of multiple-microorganism population growth and procreation is rich in landfill waste, there is abundant iron resource, anaerobism, aerobic environmental functional and microorganism species architectural characteristic, how to make full use of the so huge bioreactor of landfill yard, the biological chemistry action of iron in strengthening landfill yard, realizes source abatement H
2generation and the discharge tool of S stench are of great significance.
Summary of the invention
The invention provides a kind of H of quasi-aerobic landfill field
2the endogenous cutting method of S and device, the original position that can realize city life garbage landfill hydrogen sulfide reduces discharging, and reduces odor pollution.
A kind of H of quasi-aerobic landfill field
2the endogenous cutting device of S, comprising: reactor shell; Be positioned at the fine sand cover layer of reactor shell, waste layer, gravel layer and diafiltration liquid layer from top to bottom successively; The regulating reservoir be connected with diafiltration liquid layer; Recharge pump;
Also comprise:
Be positioned at the vertical gas discharge guiding pipe of reactor shell center, this vertical gas discharge guiding pipe runs through fine sand cover layer and waste layer;
Around several vertical inverted wells that vertical gas discharge guiding pipe is arranged, the delivery port of each vertical inverted well extends downward the differing heights place in waste layer, and the top entry of all vertical inverted wells is connected with regulating reservoir by recharging pump;
The level be arranged in waste layer recharges net, and this level is recharged Netcom and crossed and recharge pump and be connected with regulating reservoir.
As preferably, several vertical inverted wells described are evenly distributed around vertical gas discharge guiding pipe.
Further preferably, several vertical inverted wells described are divided into two groups, and the delivery port of a group extends downward the 2/5-3/5 At The Height of waste layer, and the delivery port of another group extends downward the 1/5-1/4 At The Height of waste layer.
As a kind of preferred distribution mode of all vertical inverted wells, be interspersed between two groups of vertical inverted wells, uniformly by leachate recirculation to the differing heights place in waste layer.
As the another kind of preferred distribution mode of all vertical inverted wells, all vertical inverted wells are with vertical gas discharge guiding pipe for the center of circle is two concentric rings, and all second vertical inverted well is distributed in inner ring, and all first vertical inverted well is distributed on outer shroud.
As preferably, described level recharges the 9/10-14/15 At The Height that net is positioned at waste layer.Level is recharged net and is placed in waste layer by the present invention, can better prevent the waste gas in percolate from leaking.
Centered by vertical gas discharge guiding pipe, aerobic zone, aerobic area and three kinds, anaerobic zone difference in functionality block is defined outward successively in junk-heap body inside, by recharge system of the present invention by leachate recirculation in the difference in functionality district in waste layer, percolate is distributed in whole landfill heap body, the iron in percolate is brought in landfill yard again; Anaerobism and aerobic area ferrous iron are oxidized to ferric iron by oxidizing substance in percolate again, continue to be reduced to ferrous iron under the effect of dissimilatory iron reduction microorganism, realize the redox cycle of the inner iron of landfill yard, finally reduce H
2s discharges.
As preferably, vertical inverted well is made up of outer tube and interior pipe, and outer tube is fixed on bottom reactor shell, and interior pipe is slidably installed within the outer tube and bottom end closure, and the tube wall of outer tube and interior pipe all sets out the mouth of a river, described interior pipe with recharge pump and be connected.
Interior pipe within the outer tube can be up and down, and what regulate percolate recharges height, and the bottom of interior pipe arranges sealing ring and closes, and can prevent percolate directly lower leakage.
Inner and outer tubes all set out the mouth of a river, interior pipe slidably, regulates the change in the inside anaerobism caused, aerobic region because rubbish sedimentation landfill height declines, therefore, inner and outer tubes all set out the mouth of a river, prevents from during interior pipe slide downward, causing percolate cannot recharge to specified altitude assignment.
Further preferably, interior pipe seals draw-in groove and is connected with adopting between outer tube.
As preferably, the inner and outer pipe of described vertical inverted well is equipped with prolongation interface, according to actual landfill extended height or can reduce vertical inverted well height.
As preferably, described level recharges net by the different transverse pipe of some thicknesses and some longitudinal pipes are staggered is communicated with, and thick level is recharged pipe and recharged pump and be connected, and thin level is recharged pipe and is connected to and slightly recharges on pipe.Spacing between adjacent transverse pipe and between adjacent longitudinal pipe adjusts according to the region of service.
The present invention also provides one to utilize described H
2the endogenous cutting device of S carries out H
2the method of the endogenous reduction of S, comprises the steps:
(1) broken for sorting complete rubbish is inserted in reactor shell, first all percolates are recharged net by level and recharge in waste layer, enter the transition adjusting stage;
(2), after transition has adjusted, a part of percolate is recharged net by level and recharges in waste layer, another part percolate is recharged in waste layer by vertical inverted well, enters fermentation stage;
(3), after fermentation ends, all percolates are recharged differing heights place to waste layer by vertical inverted well, enters the stage of ripeness.
Centered by vertical gas discharge guiding pipe, aerobic zone, aerobic area and anaerobic zone is formed successively outward in reactor shell.
The object of leachate recirculation described in the present invention is: again brought in landfill yard by the iron in percolate; Anaerobism and aerobic area ferrous iron are oxidized to ferric iron by oxidizing substance in percolate again, continue to be reduced to ferrous iron under the effect of dissimilatory iron reduction microorganism, realize the redox cycle of the inner iron of landfill yard, finally reduce H
2s discharges.
The strategy that recharges of the present invention adopts following three phases:
Adjustment transition stage: this stage percolate oozes out in landfill compacting process from the spontaneous moisture carried of rubbish, and easily degradation material rapidly and the oxygen generation aerobic biodegradation of rubbish entrained with react and produce, percolate output first increases sharply and tends towards stability afterwards, pH is changed to neutral meta-alkalescence gradually by initial faintly acid, landfill structure is more stable, therefore every day all percolates are recharged net by level to send in waste layer, junk-heap body inside is formed gradually different from oxygen partitioned environment.
Fermentation stage: through the adjustment at initial stage, centered by vertical gas discharge guiding pipe, aerobic zone is defined successively outward in junk-heap body inside, aerobic area and three kinds, anaerobic zone difference in functionality block, now rubbish decomposes rapidly, produce a large amount of percolates, pH is neutral meta-alkalescence, landfill structure changes from stablizing to instability, posterior settlement is comparatively obvious, therefore every day a part of percolate being recharged net by level sends in waste layer, another part percolate is recharged to the differing heights place in waste layer by vertical inverted well simultaneously, make percolate at whole landfill heap body, particularly again distribute in anaerobic zone, promote the valence state of iron in landfill yard inside and the Natural Circulation of form.
The stage of ripeness: through the fermentation in early stage, easy degradation material completes degraded substantially, percolate output reduces, pH is neutral meta-alkalescence, landfill heap body generation sedimentation, landfill structure is comparatively loose, therefore needs to adjust vertical inverted well height, all percolates are recharged to the differing heights place in waste layer by vertical inverted well by every day, and the iron of anaerobic zone is utilized.
Based on the differential responses processing stage of each, as preferably, the initial stage of described fermentation stage, by level recharge percolate that net recharges, by one group of vertical inverted well recharge to waste layer 2/5-3/5 At The Height percolate and to organize by another volume ratio that vertical inverted well recharges to the percolate at waste layer 1/5-1/4 place be 2-6:1-2:1; Further preferably, this ratio is 3:2:1;
The later stage of described fermentation stage, by level recharge percolate that net recharges, by one group of vertical inverted well recharge to waste layer 2/5-3/5 At The Height percolate and to organize by another volume ratio that vertical inverted well recharges to the percolate at waste layer 1/5-1/4 place be 1-2:2-5:1; Further preferably, this ratio is 1:2:1.
Further preferably, the described stage of ripeness, by a kind of vertical inverted well recharge to waste layer 2/5-3/5 At The Height percolate and to organize by another volume ratio that vertical inverted well recharges to the percolate at waste layer 1/5-1/4 place be 1-4:1; Further preferably, this ratio can be 2:1.
Under this preferred version, to H
2the Inner source of S is cut down effect and is further enhanced.
The described transition adjusting stage generally continues 7-15 days, and described fermentation stage generally continues 150-250 days, and the described stage of ripeness adjusts according to handling object, for house refuse, is generally 50 ~ 100 days.
In the present invention, initial stage of fermentation stage and later stage refer to first half section time and the latter half of whole fermentation stage respectively, can suitably adjust within the specific limits, the general initial stage refers to that front 1/3 ~ 1/2 time period of fermentation stage, later stage refer to rear 1/2 ~ 2/3 time period in after fermentation stage.
Iron in landfill heap body can directly and H
2s effect, is fixed in landfill heap body.In anaerobic zone, the ferric iron in landfill heap body can be reduced to ferrous iron under the effect of dissimilatory iron reduction microorganism, and the ferrous iron part generated enters double oxygen and aerobic zone, is oxidized by oxygen as ferric iron.Sub-fraction " iron resource " can enter leachate collection system along with percolate, reenters landfill yard by recharging.By recharging, the remaining a part of ferrous iron in anaerobic zone with the oxidizing substance generation chemical reaction in percolate, can change ferric iron into, enters in the redox cycle of iron again.By iron to H
2the electronics of the chemical oxidation of S, physical sedimentation and dissimilatory iron reduction microorganism and sulfate reducing bacteria is competed, at minimizing H
2while the source generation of S, the obviously H of abatement landfill yard
2s discharges (as shown in Figure 4).
Reactive chemistry formula of the present invention is as follows:
A, H
2the generation of S
Sulfurous organic compound decomposes (as cysteine):
HO
2C-CH(NH
2)-SH+H
2O→3CH
3-CO-CO
2H+H
2S+NH
3 (1)
Sulfate reduction (major way):
SO
4 2-+2(CH
2O)+2H
+→H
2S+2CO
2+2H
2O (2)
B, dissimilatory iron reduction
4Fe
3++CH
2O+H
2O→4Fe
2++4H
++CO
2 (3)
C, chemical reaction
2Fe
3++S
2-→2Fe
2++S (4)
Fe
2++S
2-→FeS (5)
As the preferred technical scheme of one, when the amount processed is larger, with described H
2the endogenous cutting device of S is an independently running unit, adopts several unit parallel runnings, and selects pipeline spacing and caliber according to the processing unit of reality.
When adopting several unit parallel runnings, ensure that the caliber of adjacent upright gas discharge guiding pipe spacing and vertical gas discharge guiding pipe is better than treatment effect when being 5-20:1; Adjacent upright gas discharge guiding pipe maximum spacing is 30-50m, and maximum caliber is 50-100cm.
Apparatus structure of the present invention is simple, and method of the present invention is to the H of refuse landfill
2the endogenous reduction successful of S, when methods combining of the present invention device of the present invention processes, to H
2the endogenous reduction effect of S improves further.
The present invention is according to subregions different in quasi-aerobic landfill field, carry out percolate specific aim to recharge, make full use of " iron resource " of the inner rich content of landfill yard, the biological oxidation being realized iron by the physics of landfill yard inside, chemistry and bioprocess is circulated, thus realizes H
2the endogenous reduction of S.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention.
Elevation when Fig. 2 is several apparatus of the present invention parallel runnings.
Plane when Fig. 3 is several apparatus of the present invention parallel runnings.
Fig. 4 is that mechanism figure is cut down in the Inner source of the inventive method.
Shown in figure, Reference numeral is as follows:
| 1-reactor shell | The vertical inverted well of 2-first | The vertical inverted well of 3-second |
| 4-recharges pipe | 5-flow control valve | 6-recharges pump |
| 7-regulating reservoir | 8-percolate guide air inlet pipe | 9-ventilating opening |
| 10-diafiltration liquid layer | 11-gravel layer | 12-waste layer |
| The vertical gas discharge guiding pipe of 13- | 14-level recharges net | 15-fine sand cover layer |
| 16-aerobic zone | 17-aerobic area | 18-anaerobic zone |
Detailed description of the invention
Embodiment 1
As shown in Figure 1, for the structural representation of the present invention's separate processing units (simulation landfill yard reactor), comprise reactor shell 1, reactor shell 1 is opened type, gravel layer 11, waste layer 12 and fine sand cover layer 15 from the bottom to top successively landfill in reactor shell 1, the below of gravel layer 11 is diafiltration liquid layer 10, the housing of diafiltration liquid layer 10 is provided with ventilating opening 9, ventilating opening is traditionally arranged to be 3 ~ 4, regulating reservoir 7 is set near reactor shell 1, diafiltration liquid layer 10 is connected to regulating reservoir 7 by percolate guide air inlet pipe 8, an entrance recharging pump 6 is connected in regulating reservoir 7.
Above structure division all can adopt the conventional processing device in this area, and focus on the structure improving leachate recirculation system in present embodiment, leachate recirculation system comprises vertical inverted well and level recharges net 14.
Center in reactor shell 1 arranges a vertical gas discharge guiding pipe 13, this vertical gas discharge guiding pipe runs through fine sand cover layer 15 and waste layer 12, gravel layer 11 place is fixed in lower end, upper end is extended outside fine sand cover layer 15, vertical gas discharge guiding pipe 4 is hollow cylindrical speed row dragon, its tube wall is fine and close engraved structure, and air is easy to enter landfill waste from tube wall.
Vertical inverted well is set to several, vertical inverted well is evenly arranged around vertical gas discharge guiding pipe 13, several vertical inverted wells are divided into two groups: i.e. the first vertical inverted well 2 and the second vertical inverted well 3, first vertical inverted well 2 and the second vertical inverted well 3 interlaced arrangement, the delivery port of the first vertical inverted well 2 extends downward the 1/5-1/4 At The Height of waste layer, and the delivery port of the second vertical inverted well 3 extends downward the 2/5-3/5 At The Height of waste layer.
All vertical inverted wells also can with vertical gas discharge guiding pipe 13 for the center of circle be two concentric rings, and all second vertical inverted well 3 is distributed in inner ring, and all first vertical inverted well 2 is distributed on outer shroud.
Each vertical inverted well is made up of outer tube and interior pipe, outer tube is fixed on the bottom in reactor shell, and interior pipe is slidably installed within the outer tube and bottom end closure, and interior pipe seals draw-in groove and is connected with adopting between outer tube, the tube wall of outer tube and interior pipe all sets out the mouth of a river, and interior pipe recharges pump by pipeline connection.
Interior pipe within the outer tube can be up and down, and what regulate percolate recharges height, and the bottom of interior pipe arranges sealing ring and closes, and leaks under can preventing percolate, and outer tube and interior pipe are equipped with extending connector.
Level is recharged net 14 and is arranged in waste layer 12, is positioned at the 9/10-14/15 At The Height of waste layer, and level is recharged net 14 and comprised some transverse pipe of staggered connection and some longitudinal pipes, and level is recharged net 14 and recharged pump 6 by recharging pipe 4 connection.
Recharge pipe 4 be connected recharge pump and vertical inverted well pipeline on be equipped with flow control valve 5.
The method of operation of this reaction unit is as follows:
Leachate collection in garbage loading embeading process is in diafiltration liquid layer 10, entered in regulating reservoir 7 by percolate guide air inlet pipe 8, recharge pump 6 and the percolate in regulating reservoir 7 is recharged the vertical inverted well 2 of net 14, first through level and the second vertical inverted well 3 recharges in waste layer.
Recharge method is as follows:
Adjustment transition stage (being generally 7-15 days), the level that pumped into by all percolates every day is recharged pipe network and is recharged;
Fermentation stage (general 150-250 days), a part of percolate is pumped into level and recharges pipe network by every day, another part percolate is pumped into the first vertical inverted well and the second vertical inverted well simultaneously, the fermentation initial stage, the level of pumping into recharges pipe network, and the ratio of recharging of the second vertical inverted well 3 and the first vertical inverted well 2 is 2-6:1-2:1; In the fermentation later stage, the level of pumping into recharges pipe network, and the ratio of recharging of the second vertical inverted well 3 and the first vertical inverted well 2 is 1-2:2-5:1;
In the stage of ripeness (at least running 50-100 days), every day all percolates are pumped into the second vertical inverted well 3 and the first vertical inverted well 2, the ratio of recharging is 1-4:1.
Said apparatus is adopted to carry out H
2application examples and the effect of the endogenous reduction of S are as follows:
House refuse is gathered from living area, Hangzhou garbage transfer station, laboratory is transported to immediately after sample collection, adopt the mode of hand breaking by the Domestic garbage crushing of collection to about 10mm × 30mm, reject the inert substances such as fragment of brick, cinder and stone in shattering process, load immediately in the device of above-mentioned embodiment after refuse breaking mixing.
Three simulations landfill yard reactor (R1, R2 and R3) are run, wherein R1 adopts the conventional percolate landfill-backflow device of this area, R2 and R3 adopts the device of the present embodiment, and adopting same size and material (polypropylene), reactor shell is the cylinder of internal diameter 50cm, high 200cm.Each simulation landfill yard reactor is from top to bottom followed successively by: the gravel layer of the waste layer that the fine sand cover layer of 10cm, 140cm are thick and 10cm, is the diafiltration liquid layer of 30cm below gravel layer, is provided with three ventilating openings that angle is 120 degree.The vertical gas discharge guiding pipe that diameter is 5cm is also set in the vertical center of circle of reactor, for the formation of difference containing oxygen region.In landfill heap body, be respectively arranged with four first vertical inverted wells and four second vertical inverted wells in cross, and a set of latticed level recharges pipe.
Insert in simulation reaction apparatus successively by broken for sorting complete rubbish, each reactor inserts rubbish 192kg, makes landfill density be 700kg/m
3.After garbage loading embeading, the ventilating opening wherein in a set of reactor (R1) diafiltration liquid layer and reactor head seal, and all the other two cover reactor (R2, R3) all blow-by, run under being placed in room temperature.
After percolate produces, R1 adopts the top surface mode of recharging to recharge percolate every day, and all percolates are recharged net by level to R2 and vertical inverted well recharges, but does not carry out the stage of recharging and recharge the adjustment of ratio.
R3 employing is of the present invention recharges strategy:
Adjustment transition stage (7 days), the level that pumped into by all percolates every day is recharged pipe network and is recharged; Fermentation stage (185 days), a part of percolate is pumped into level and recharges pipe network by every day, another part percolate is pumped into the first vertical inverted well and the second vertical inverted well simultaneously.At the fermentation initial stage, the level of pumping into recharges pipe network, and the ratio of recharging of the second vertical inverted well 3 and the first vertical inverted well 2 is 3:2:1; In the fermentation later stage, the level of pumping into recharges pipe network, and the ratio of recharging of the second vertical inverted well 3 and the first vertical inverted well 2 is 1:2:1;
In the stage of ripeness (70 days), every day all percolates are pumped into the second vertical inverted well 3 and the first vertical inverted well 2, the ratio of recharging is 2:1.
The composition of initial waste is that kitchen mores than 66.91%, stationery 9.18%, rubber and plastic class 3.18%, fibrous woven class 0.50%, type of wood and bamboo 1.61%, grey great soil group 1.75%, category of glass 0.38%, metal species 0.22%, mixture 16.49% (weight in wet base).
Sulfide concentration time initial in three reactor rubbish only has 0.15mg/kg, and after 128 days, R1, R2 and R3 reactor sulfide concentration is 331mg/kg266mg/kg and 115mg/kg, is also that R3 medium sulphide content concentration is minimum after 262 days; In the percolate of R1 and R2, the fluctuation of ferrous and total iron is little, and in R3 the content of iron and fluctuation of concentration larger.The H of simulation landfill yard reactor head
2s release conditions is as shown in table 1:
Table 1
As can be known from the above results, the H of three reactors
2s concentration R1 is maximum, and R3 is minimum.Adopt device of the present invention can reduce H within the specific limits
2s burst size, can realize landfill yard H
2the endogenous abatement of S stench; Adopt the combination of apparatus of the present invention and recharge method, can make full use of further " iron resource " that landfill yard inside is abundant, reduce H further
2s burst size.
Embodiment 2
For large-scale landfill, some unit parallel runnings as shown in Figure 1 can be adopted, can adopt and reaction unit is as shown in Figure 1 carried out parallel connection use, also several unit can be divided in a large landfill yard, arranging of recharge system in each unit adopts recharge system as shown in Figure 1, recharge system Parallel Control in all unit is the second parallel running mode as shown in Figures 2 and 3.
The center of each unit arranges vertical gas discharge guiding pipe 13, centered by vertical gas discharge guiding pipe 13, outwards successively the waste layer in this unit is divided into aerobic zone 16, aerobic area 17 and anaerobic zone 18, first vertical inverted well 2 and the second vertical inverted well 3 are uniformly distributed in waste layer around vertical gas discharge guiding pipe 13, all vertical inverted wells are distributed on two diagonal of this cell cross-section, second vertical inverted well 3 is positioned at inner ring, second vertical inverted well 2 is positioned at outer ring, level is recharged net 14 and is laid in waste layer, percolate in diafiltration liquid layer 10 below waste layer is entered in regulating reservoir 7 by percolate guide air inlet pipe 8.
When adopting several unit parallel runnings, ensure the caliber of adjacent upright gas discharge guiding pipe spacing and vertical gas discharge guiding pipe than being 5-20:1; Adjacent upright gas discharge guiding pipe maximum spacing is 30-50m, and maximum caliber is 50-100cm.
Recharge pump according to recharge as follows strategy by leachate recirculation in waste layer:
Adjustment transition stage (15 days), the level that pumped into by all percolates every day is recharged pipe network and is recharged;
Fermentation stage (235 days), a part of percolate is pumped into level and recharges pipe network by every day, another part percolate is pumped into the first vertical inverted well and the second vertical inverted well simultaneously.At the fermentation initial stage, the level of pumping into recharges pipe network, and the ratio of recharging of the second vertical inverted well 3 and the first vertical inverted well 2 is 3:2:1; In the fermentation later stage, the level of pumping into recharges pipe network, and the ratio of recharging of the second vertical inverted well 3 and the first vertical inverted well 2 is 1:2:1;
In the stage of ripeness (85 days), every day all percolates are pumped into the second vertical inverted well 3 and the first vertical inverted well 2, the ratio of recharging is 2:1.
The composition of landfill waste is that kitchen mores than 62.12%, stationery 7.42%, rubber and plastic class 4.16%, fibrous woven class 2.11%, type of wood and bamboo 2.34%, grey great soil group 3.84%, category of glass 1.97%, metal species 1.74%, mixture 14.30% (weight in wet base).
Adopt which to run, result is as shown in table 2:
Table 2
As shown in Table 2, landfill top layer H
2the concentration of S is up to 1.23ppm, only has 0.14ppm time minimum, well below the block conventionally run (the highest 35.15ppm, minimum 3.12ppm), cuts down respond well.
Claims (10)
1. the H of a quasi-aerobic landfill field
2the endogenous cutting device of S, comprising: reactor shell; Be positioned at the fine sand cover layer of reactor shell, waste layer, gravel layer and diafiltration liquid layer from top to bottom successively; The regulating reservoir be connected with diafiltration liquid layer; Recharge pump;
It is characterized in that, also comprise:
Be positioned at the vertical gas discharge guiding pipe of reactor shell center, this vertical gas discharge guiding pipe runs through fine sand cover layer and waste layer;
Around several vertical inverted wells that vertical gas discharge guiding pipe is arranged, the delivery port of each vertical inverted well extends downward the differing heights place in waste layer, and the top entry of all vertical inverted wells is connected with regulating reservoir by recharging pump;
The level be arranged in waste layer recharges net, and this level is recharged Netcom and crossed and recharge pump and be connected with regulating reservoir.
2. the H of quasi-aerobic landfill field according to claim 1
2the endogenous cutting device of S, is characterized in that, several vertical inverted wells described are evenly distributed around vertical gas discharge guiding pipe.
3. the H of quasi-aerobic landfill field according to claim 1
2the endogenous cutting device of S, is characterized in that, several vertical inverted wells described are divided into two groups, and the delivery port of a group extends downward the 2/5-3/5 At The Height of waste layer, and the delivery port of another group extends downward the 1/5-1/4 At The Height of waste layer.
4. the H of quasi-aerobic landfill field according to claim 1
2the endogenous cutting device of S, is characterized in that, described level recharges the 9/10-14/15 At The Height that net is positioned at waste layer.
5. the H of quasi-aerobic landfill field according to claim 1
2the endogenous cutting device of S, is characterized in that, described vertical inverted well is made up of outer tube and interior pipe, outer tube is fixed on bottom reactor shell, interior pipe is slidably installed within the outer tube and bottom end closure, and the tube wall of outer tube and interior pipe all sets out the mouth of a river, described interior pipe with recharge pump and be connected.
6. one kind utilizes H described in claim 1
2the endogenous cutting device of S carries out H
2the method of the endogenous reduction of S, is characterized in that, comprise the steps:
(1) broken for sorting complete rubbish is inserted in reactor shell, first all percolates are recharged net by level and recharge in waste layer, enter the transition adjusting stage;
(2), after transition has adjusted, a part of percolate is recharged net by level and recharges in waste layer, another part percolate is recharged in waste layer by vertical inverted well, enters fermentation stage;
(3), after fermentation ends, all percolates are recharged differing heights place to waste layer by vertical inverted well, enters the stage of ripeness.
7. method according to claim 6, is characterized in that,
The initial stage of described fermentation stage, by level recharge percolate that net recharges, by one group of vertical inverted well recharge to waste layer 2/5-3/5 At The Height percolate and to organize by another volume ratio that vertical inverted well recharges to the percolate at waste layer 1/5-1/4 place be 2-6:1-2:1;
The later stage of described fermentation stage, by level recharge percolate that net recharges, by one group of vertical inverted well recharge to waste layer 2/5-3/5 At The Height percolate and to organize by another volume ratio that vertical inverted well recharges to the percolate at waste layer 1/5-1/4 place be 1-2:2-5:1.
8. method according to claim 6, it is characterized in that, the described stage of ripeness, by a kind of vertical inverted well recharge to waste layer 2/5-3/5 At The Height percolate and to organize by another volume ratio that vertical inverted well recharges to the percolate at waste layer 1/5-1/4 place be 1-4:1.
9. method according to claim 6, is characterized in that, with described H
2the endogenous cutting device of S is an independently running unit, adopts several unit parallel runnings.
10. state method according to claim 9, it is characterized in that, the caliber of adjacent upright gas discharge guiding pipe spacing and vertical gas discharge guiding pipe is than being 5-20:1.
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