CN104259173B - A kind of H of accurate aerobic landfill2The endogenous cutting method of S and device - Google Patents
A kind of H of accurate aerobic landfill2The endogenous cutting method of S and device Download PDFInfo
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- CN104259173B CN104259173B CN201410354102.3A CN201410354102A CN104259173B CN 104259173 B CN104259173 B CN 104259173B CN 201410354102 A CN201410354102 A CN 201410354102A CN 104259173 B CN104259173 B CN 104259173B
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Abstract
The invention discloses a kind of H of accurate aerobic landfill2The endogenous cutting method of S and device, device comprises: reactor shell; Fine sand cover layer, waste layer, gravel layer and diafiltration liquid layer in housing; Regulating reservoir; Recharge pump; The vertical gas discharge guiding pipe that is positioned at reactor shell center, runs through fine sand cover layer and waste layer; Several vertical inverted wells that arrange around vertical gas discharge guiding pipe, the delivery port of each vertical inverted well extends to the differing heights place in waste layer, and the top entrance of all vertical inverted wells is connected with regulating reservoir by recharging pump; The level being arranged in waste layer is recharged net, is connected with regulating reservoir by recharging pump. The present invention is according to subregions different in accurate aerobic landfill, carrying out percolate specific aim recharges, make full use of " iron resource " of the inner rich content of landfill yard, realize the biological oxidation circulation of iron by physics, chemistry and the bioprocess of landfill yard inside, thereby realize H2The endogenous reduction of S.
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 H2Endogenous cutting method and the device of S stench.
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 main trash processing way both domestic and external. According to statistics, in China's urban garbage disposal, landfill disposal amount arrives more than 60% at present, the national conditions of China and the characteristic of domestic waste have also determined that, within the quite a long time from now on, landfill is still the major way of present stage China's urban garbage disposal. Along with city size constantly expands and the fast increasing of generation, some refuse landfills of China are surrounded by residential block just gradually, and the stench of refuse landfill disturbs residents becomes one of environmental hazard that public's complaint is the widest.
H2S is typical odorant, colourless and have excitant and asphyxiant rotten egg smell, is slightly soluble in water, and its odor threshold is extremely low, is 0.5ppb. Be exposed to H2In S environment, can cause all kinds of eyes, respiratory tract and neurogenic disease, even shock death is very large to workman and periphery resident's healthy harm. So, the effectively H of disposal of refuse landfill yard2S 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 H2S odor pollution control technology mainly contains Physical, chemical method and bioanalysis, taking end treatment as main, comprises charcoal absorption, water washing, photochemical catalytic oxidation, ozone oxidation, biofiltration and activated sludge process etc. Wherein, the advantage such as that physical method has is simple to operate, instant effect, but only suitable treatment low concentration, odorant among a small circle of this method, 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 has screening and the domestication difficult problem of high-effective microorganism.
Iron is the variable valency metal that biosphere the most often utilizes, extremely abundant at landfill yard intensive amount, and landfill yard is described as " third place in the world great Tie Ku ". Iron can be realized the conversion between divalence, trivalent under chemistry and biological effect, and ferrous iron can be directly and H2S reaction directly generates ferrous sulfide precipitation, and ferric iron also can be by H2S is oxidized to elemental sulfur, reduction form ferrous iron again can with H2S effect generates precipitation. In addition, in landfill yard, also there is a large amount of dissimilatory iron reduction bacterium, under these microbial actions, the alienation iron process of microorganism can be coupled organic oxidative degradation, both can compete electron donor 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 H2S odor prevention is technical has obtained certain achievement, but these methods mainly concentrate in end control, lack effective source control device. In landfill waste, be rich in the nutriment of multiple-microorganism population growth and procreation, 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, in strengthening landfill yard, the biological chemistry action of iron, realizes source and subdues H2The generation of S stench and discharge tool are of great significance.
Summary of the invention
The invention provides a kind of H of accurate aerobic landfill2The 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 accurate aerobic landfill2The endogenous cutting device of S, comprising: reactor shell; Be positioned at successively fine sand cover layer, waste layer, gravel layer and the diafiltration liquid layer of reactor shell from top to bottom; The regulating reservoir being 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;
Several vertical inverted wells that arrange around vertical gas discharge guiding pipe, the delivery port of each vertical inverted well extends downward the differing heights place in waste layer, and the top entrance of all vertical inverted wells is connected with regulating reservoir by recharging pump;
The level being arranged in waste layer is recharged net, and this level is recharged Netcom and crossed and recharge pump and be connected with regulating reservoir.
As preferably, described several vertical inverted wells are evenly distributed around vertical gas discharge guiding pipe.
Further preferably, described several vertical inverted wells 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, between two groups of vertical inverted wells, be interspersed, 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 two concentric rings taking vertical gas discharge guiding pipe as the center of circle, and the second all vertical inverted wells are distributed on interior ring, and the first all vertical inverted wells are distributed on outer shroud.
As preferably, described level is recharged net and is positioned at the 9/10-14/15 At The Height of waste layer. The present invention recharges net by level and is placed in waste layer, can better prevent that the waste gas in percolate from leaking.
Aerobic zone, aerobic area and three kinds of anaerobic zones difference in functionality block centered by vertical gas discharge guiding pipe, have been formed successively outward in junk-heap body inside, by recharge system of the present invention by leachate recirculation to 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 again oxidized to ferric iron by oxidizing substance in percolate, continues to be reduced to ferrous iron under the effect of dissimilatory iron reduction microorganism, realizes the redox cycle of the inner iron of landfill yard, finally reduces H2S discharges.
As preferably, vertical inverted well is made up of outer tube and inner tube, and outer tube is fixed on reactor shell bottom, and inner tube is slidably installed within the outer tube and bottom sealing, all sets out the mouth of a river on the tube wall of outer tube and inner tube, described inner tube with recharge pump and be connected.
Inner tube within the outer tube can be up and down, regulates the height that recharges of percolate, and the bottom of inner tube arranges sealing ring and seals, and can prevent directly lower leakage of percolate.
Inner and outer tubes all set out the mouth of a river, inner tube slidably, regulates due to rubbish sedimentation landfill height decline the inside anaerobism causing, the change in aerobic region, therefore, in inner and outer tubes, all set out the mouth of a river, while preventing inner tube down sliding, cause percolate cannot recharge to specified altitude assignment.
Further preferably, between inner tube and outer tube, adopt sealing draw-in groove to be connected.
As preferably, the inner and outer pipe of described vertical inverted well is equipped with prolongation interface, can extend or reduce vertical inverted well height according to actual landfill 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 carefully level is recharged pipe and is connected to and slightly recharges on pipe. Spacing between adjacent transverse pipe and between adjacent longitudinal pipe is adjusted according to the region of service.
The present invention also provides one to utilize described H2The endogenous cutting device of S carries out H2The method of the endogenous reduction of S, comprises the steps:
(1) broken sorting complete rubbish is inserted in reactor shell, first all percolates are recharged to net by level and recharge to waste layer, enter the transition adjusting stage;
(2) after transition adjustment completes, a part of percolate is recharged to net by level and recharge to waste layer, another part percolate recharges to waste layer by vertical inverted well, enters fermentation stage;
(3) after fermentation ends, all percolates are recharged to the differing heights place to waste layer by vertical inverted well, enter the stage of ripeness.
In reactor shell, centered by vertical gas discharge guiding pipe, form successively outward aerobic zone, aerobic area and anaerobic zone.
The object of leachate recirculation described in the present invention is: the iron in percolate is brought in landfill yard again; Anaerobism and aerobic area ferrous iron are again oxidized to ferric iron by oxidizing substance in percolate, continues to be reduced to ferrous iron under the effect of dissimilatory iron reduction microorganism, realizes the redox cycle of the inner iron of landfill yard, finally reduces H2S discharges.
The strategy that recharges of the present invention adopts following three phases:
Adjust transition stage: this stage percolate oozes out in landfill compacting process from the spontaneous moisture carrying of rubbish, and the oxygen generation aerobic biodegradation that easily degradation material is carried secretly with rubbish rapidly reacts generation, 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 to net by level and 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, formed successively outward aerobic zone in junk-heap body inside, the three kinds of difference in functionality blocks in aerobic area and anaerobic zone, now rubbish decomposes rapidly, produce a large amount of percolates, pH is neutral meta-alkalescence, landfill structure is from stablizing to unstable transformation, posterior settlement is comparatively obvious, therefore every day a part of percolate being recharged to 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 in anaerobic zone, again distribute, promote iron in the valence state of landfill yard inside and the Natural Circulation of form.
The stage of ripeness: through the fermentation in early stage, easily 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, recharge all percolates to the differing heights place in waste layer by vertical inverted well every day, and the iron of anaerobic zone is utilized.
The differential responses processing stage of based on 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 the percolate of waste layer 2/5-3/5 At The Height and by another organize vertical inverted well recharge to the volume ratio of 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 the percolate of waste layer 2/5-3/5 At The Height and by another organize vertical inverted well recharge to the volume ratio of 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 the percolate of waste layer 2/5-3/5 At The Height and by another organize vertical inverted well recharge to the volume ratio of 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 H2The 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 is adjusted according to handling object, for house refuse, is generally 50～100 days.
In the present invention, the initial stage of fermentation stage and later stage refer to respectively first half section time and time second half section of whole fermentation stage, can suitably adjust within the specific limits, the general initial stage refers to front 1/3～1/2 time period of fermentation stage, and the later stage refers to rear 1/2～2/3 time period in after fermentation stage.
Iron in landfill heap body can be directly and H2S 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 generating enters hold concurrently oxygen and aerobic zone, is oxidized by oxygen as ferric iron. Sub-fraction " iron resource " can, along with percolate enters leachate collection system, reenter landfill yard by recharging. By recharging, the remaining a part of ferrous iron in anaerobic zone can with percolate in oxidizing substance generation chemical reaction, again change ferric iron into, enter in the redox cycle of iron. By iron to H2The electronics competition of chemical oxidation, physical sedimentation and dissimilatory iron reduction microorganism and the sulfate reducing bacteria of S, is reducing H2When the source of S generates, obviously subdue the H of landfill yard2S discharges (as shown in Figure 4).
Reactive chemistry formula of the present invention is as follows:
a、H2The generation of S
Sulfurous organic compound decomposes (as cysteine):
HO2C-CH(NH2)-SH+H2O→3CH3-CO-CO2H+H2S+NH3(1)
Sulfate reduction (major way):
SO4 2-+2(CH2O)+2H+→H2S+2CO2+2H2O(2)
B, dissimilatory iron reduction
4Fe3++CH2O+H2O→4Fe2++4H++CO2(3)
C, chemical reaction
2Fe3++S2-→2Fe2++S(4)
Fe2++S2-→FeS(5)
As the preferred technical scheme of one, in the time that the amount of processing is larger, with described H2The endogenous cutting device of S is an independently running unit, adopts several unit parallel runnings, and selects pipeline spacing and caliber according to actual processing unit.
In the time adopting the parallel running of several unit, ensure adjacent vertical gas discharge guiding pipe spacing and vertically caliber treatment effect when for 5-20:1 of gas discharge guiding pipe is better; Adjacent vertical gas discharge guiding pipe maximum spacing is 30-50m, and maximum caliber is 50-100cm.
Apparatus structure of the present invention is simple, the H of method of the present invention to refuse landfill2The endogenous reduction successful of S, in the time that method of the present invention is processed in conjunction with device of the present invention, to H2The endogenous reduction effect of S further improves.
The present invention is according to subregions different in accurate aerobic landfill, carrying out percolate specific aim recharges, make full use of " iron resource " of the inner rich content of landfill yard, realize the biological oxidation circulation of iron by physics, chemistry and the bioprocess of landfill yard inside, thereby realize H2The endogenous reduction of S.
Brief description of the drawings
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 is recharged 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 independent process unit of the present invention (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 that recharges pump 6 is connected in regulating reservoir 7.
Above structure division all can adopt the conventional treatment equipment in this area, focuses on improving the structure of leachate recirculation system in present embodiment, and leachate recirculation system comprises that vertical inverted well and level recharge 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 places are fixed in lower end, extend outside fine sand cover layer 15 upper end, vertically 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 evenly arranges 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, the 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 be two concentric rings taking vertical gas discharge guiding pipe 13 as the center of circle, the second all vertical inverted wells 3 are distributed on interior ring, and the first all vertical inverted wells 2 are distributed on outer shroud.
Each vertical inverted well is made up of outer tube and inner tube, outer tube is fixed on the bottom in reactor shell, and inner tube is slidably installed within the outer tube and bottom sealing, adopts sealing draw-in groove to be connected between inner tube and outer tube, on the tube wall of outer tube and inner tube, all set out the mouth of a river, inner tube is connected and is recharged pump by pipeline.
Inner tube within the outer tube can be up and down, regulates the height that recharges of percolate, and the bottom of inner tube arranges sealing ring and seals, and can prevent from leaking under percolate, and outer tube and inner tube 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 staggered some transverse pipe and the some longitudinal pipes being communicated with, and level is recharged net 14 and recharged pump 6 by recharging pipe 4 connections.
On recharging pipe 4 and being connected the pipeline that recharges pump and vertical inverted well, 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 to net 14, the first vertical inverted well 2 and the second vertical inverted well 3 through level recharge to waste layer.
Recharge method is as follows:
Adjust transition stage (being generally 7-15 days), pump into level by all percolates and recharge pipe network and recharge every day;
Fermentation stage (general 150-250 days), pump into level by a part of percolate and recharge pipe network 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 is recharged 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 is recharged 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 moving 50-100 days), pump into second vertical inverted well 3 and first vertical inverted well 2 by all percolates every day, and the ratio of recharging is 1-4:1.
Adopt said apparatus to carry out H2Application examples and the effect of the endogenous reduction of S are as follows:
Gather house refuse from living area, Hangzhou garbage transfer station, after sample collection, be transported to immediately laboratory, the mode that adopts hand breaking by the Domestic garbage crushing gathering to 10mm × 30mm left and right, in shattering process, reject the inert substances such as fragment of brick, cinder and stone, after refuse breaking mixes, pack into immediately in the device of above-mentioned embodiment.
Three simulation landfill yard reactors (R1, R2 and R3) are moved, wherein R1 adopts the conventional percolate landfill-backflow device of this area, R2 and R3 adopt the device of the present embodiment, and adopt 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 waste layer that the fine sand cover layer of 10cm, 140cm are thick and the gravel layer of 10cm, and gravel layer below is the diafiltration liquid layer of 30cm, being provided with angle is three ventilating openings of 120 degree. It is the vertical gas discharge guiding pipe of 5cm that diameter is also set in the vertical center of circle of reactor, is used to form different from oxygen region. In landfill heap body, be cross and be respectively arranged with four the first vertical inverted wells and four the second vertical inverted wells, and a set of latticed level is recharged pipe.
Broken sorting complete rubbish is inserted in simulation reaction apparatus successively, and each reactor is inserted rubbish 192kg, and making landfill density is 700kg/m3. After garbage loading embeading, wherein ventilating opening and the reactor head in a set of reactor (R1) diafiltration liquid layer seals, and all the other two all blow-by of cover reactor (R2, R3), are placed under room temperature and move.
After percolate produces, R1 adopts the top surface mode of recharging every day percolate to be recharged, and all percolates are recharged to net by level to R2 and vertical inverted well recharges, but does not recharge the stage and recharge the adjustment of ratio.
R3 adopts the strategy that recharges of the present invention:
Adjust transition stage (7 days), pump into level by all percolates and recharge pipe network and recharge every day; Fermentation stage (185 days), pump into level by a part of percolate and recharge pipe network every day, another part percolate pumped into the first vertical inverted well and the second vertical inverted well simultaneously. At the fermentation initial stage, the level of pumping into is recharged 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 is recharged 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), pump into second vertical inverted well 3 and first vertical inverted well 2 by all percolates every day, and the ratio of recharging is 2:1.
The composition of initial waste is that kitchen Yus 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 when initial in three reactor rubbish only has 0.15mg/kg, and after 128 days, R1, R2 and R3 reactor sulfide concentration are 331mg/kg266mg/kg and 115mg/kg, are 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 head2S release conditions is as shown in table 1:
Table 1
As can be known from the above results, the H of three reactors2S concentration R1 maximum, R3 minimum. Adopt device of the present invention can reduce within the specific limits H2S burst size, can realize landfill yard H2The endogenous of S stench subdued; Adopt the combination of apparatus of the present invention and recharge method, can further make full use of landfill yard inner abundant " iron resource ", further reduce H2S burst size.
Embodiment 2
For large-scale landfill, can adopt some unit parallel running as shown in Figure 1, can adopt reaction unit is as shown in Figure 1 carried out to parallel connection use, also can in a large landfill yard, be divided into several unit, 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, the 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, the second vertical inverted well 3 is positioned at inner ring, the second vertical inverted well 2 is positioned at outer ring, level is recharged net 14 and is laid in waste layer, percolate in the diafiltration liquid layer 10 of waste layer below is entered in regulating reservoir 7 by percolate guide air inlet pipe 8.
In the time adopting the parallel running of several unit, ensure adjacent vertical gas discharge guiding pipe spacing and vertically the caliber of gas discharge guiding pipe than being 5-20:1; Adjacent vertical 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 to waste layer:
Adjust transition stage (15 days), pump into level by all percolates and recharge pipe network and recharge every day;
Fermentation stage (235 days), pump into level by a part of percolate and recharge pipe network every day, another part percolate pumped into the first vertical inverted well and the second vertical inverted well simultaneously. At the fermentation initial stage, the level of pumping into is recharged 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 is recharged 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), pump into second vertical inverted well 3 and first vertical inverted well 2 by all percolates every day, and the ratio of recharging is 2:1.
The composition of landfill waste is that kitchen Yus 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 move, result is as shown in table 2:
Table 2
As shown in Table 2, landfill top layer H2The concentration of S is up to 1.23ppm, only has 0.14ppm when minimum, well below according to the block (the highest 35.15ppm, minimum 3.12ppm) of traditional approach operation, cuts down respond well.
Claims (9)
1. the H of an accurate aerobic landfill2The method of the endogenous reduction of S, is characterized in that, comprise asLower step:
(1) broken sorting complete rubbish is inserted in reactor shell, first that all percolates are logicalThe level of mistake is recharged net and is recharged to waste layer, enters the transition adjusting stage;
(2) after transition adjustment completes, a part of percolate is recharged to net by level and recharge to rubbishIn layer, another part percolate recharges to waste layer by vertical inverted well, enters fermentation stage;
(3), after fermentation ends, all percolates are recharged to waste layer by vertical inverted wellDiffering heights place, enters the stage of ripeness;
The device of realizing described method comprises: reactor shell; Be positioned at successively reactor enclosure from top to bottomFine sand cover layer, waste layer, gravel layer and diafiltration liquid layer in body; The tune being connected with diafiltration liquid layerJoint pond; 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 thinHusky cover layer and waste layer;
Several vertical inverted wells that arrange around vertical gas discharge guiding pipe, the delivery port of each vertical inverted wellExtend downward the differing heights place in waste layer, the top entrance of all vertical inverted wells is by rechargingPump is connected with regulating reservoir;
The level being arranged in waste layer is recharged net, and this level is recharged Netcom and crossed and recharge pump and regulating reservoir phaseBe communicated with.
2. method according to claim 1, is characterized in that,
At the initial stage of described fermentation stage, recharge percolate that net recharges, vertical by a group by levelInverted well recharges to the percolate of waste layer 2/5-3/5 At The Height and organizes vertical inverted well by another and returnFill with to the volume ratio of the percolate at waste layer 1/5-1/4 place be 2-6:1-2:1;
In the later stage of described fermentation stage, recharge percolate that net recharges, vertical by a group by levelInverted well recharges to the percolate of waste layer 2/5-3/5 At The Height and organizes vertical inverted well by another and returnFill with to the volume ratio of the percolate at waste layer 1/5-1/4 place be 1-2:2-5:1.
3. method according to claim 1, is characterized in that, the described stage of ripeness, by oneOrganizing vertical inverted well recharges to the percolate of waste layer 2/5-3/5 At The Height with by vertical time of another groupFill with well recharge to the volume ratio of the percolate at waste layer 1/5-1/4 place be 1-4:1.
4. method according to claim 1, is characterized in that, with H2The endogenous cutting device of S isA running unit independently, adopts several unit parallel runnings.
5. state method according to claim 4, it is characterized in that, adjacent vertical gas discharge guiding pipe spacingCompare for 5-20:1 with the caliber of vertical gas discharge guiding pipe.
6. method according to claim 1, is characterized in that described several vertical inverted wellsBe evenly distributed around vertical gas discharge guiding pipe.
7. method according to claim 1, is characterized in that described several vertical inverted wellsBe divided into two groups, the delivery port of a group extends downward the 2/5-3/5 At The Height of waste layer, another groupDelivery port extends downward the 1/5-1/4 At The Height of waste layer.
8. method according to claim 1, is characterized in that, described level is recharged net and is positioned at rubbishThe 9/10-14/15 At The Height of rubbish layer.
9. method according to claim 1, is characterized in that, described vertical inverted well is by outer tubeForm with inner tube, outer tube is fixed on reactor shell bottom, and inner tube is slidably installed within the outer tube and bottomSealing, all sets out the mouth of a river on the tube wall of outer tube and inner tube, described inner tube with recharge pump and be connected.
Priority Applications (1)
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| CN111705849B (en) * | 2019-08-09 | 2021-12-03 | 乐清市辰卓电气有限公司 | Tracking monitoring well of landfill seepage-proofing system |
| CN110665931A (en) * | 2019-10-29 | 2020-01-10 | 中冶南方都市环保工程技术股份有限公司 | In-situ remediation system and method for aerobic-anaerobic circulation of refuse landfill |
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