CN208787194U - The processing unit of landfill leachate leaching flying ash - Google Patents
The processing unit of landfill leachate leaching flying ash Download PDFInfo
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- CN208787194U CN208787194U CN201821492316.7U CN201821492316U CN208787194U CN 208787194 U CN208787194 U CN 208787194U CN 201821492316 U CN201821492316 U CN 201821492316U CN 208787194 U CN208787194 U CN 208787194U
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Abstract
The utility model relates to offal treatments and application technology as the second resource field, more particularly, to a kind of processing unit of landfill leachate leaching flying ash.The processing unit of the landfill leachate leaching flying ash, including percolate accommodating unit and leaching unit；The leaching unit includes flying dust packed column；It is connected at the top of the percolate accommodating unit and flying dust packed column.The utility model carries out leaching processing to flying dust with percolate, has pore structure abundant after fly ash granule accumulation, can effectively adsorb pollutant in retention concentrate；Percolate can dissolve out the harmful heavy metal in flying dust, reduce the Leaching of flying dust.
Description
Technical field
The utility model relates to offal treatments and application technology as the second resource field, more particularly, to a kind of landfill leachate
The processing unit of leaching flying ash.
Background technique
Film concentrate is that " biochemical treatment+UF membrane (nanofiltration/reverse osmosis) " group technology processing landfill leachate obtains
By-product compares landfill leachate, inorganic salts and persistent organic pollutants containing high concentration.Currently, film concentrate
Processing technique mainly has advanced oxidation, evaporation, membrane distillation etc., but in practical engineering applications, these technologies are difficult to stablize fortune more
Row.Nanofiltration membrane concentrate is in brownish black, and containing a large amount of humus materials, COD concentration is high, usually 1000-5000mg/L, this
Also contain Ca, Mg, Ba, SO outside4 2-Etc. the heavy metal ion such as divalent salt ion and Cd, Zn, Pb, Cr.Compared to reverse osmosis concentrated liquid,
The more difficult disposition of nanofiltration membrane concentrate.
The by-product that flying dust is generated as consumer waste incineration, because of the high poison of the heavy metal containing high leaching concentration and trace
Property persistent organism, be managed by China as hazardous waste, needed to enter after harmless treatment in principle dangerous useless
Object landfill yard, but since the storage capacity of hazardous waste landfill is limited and costly, " household refuse landfill sites contamination control mark
It is quasi- " (GB 16889-2008) allow it to enter household refuse landfill sites after solidification and stabilization to fill.But to " life rubbish
Rubbish landfill yard contamination control standard " (GB 16889-2008) implement to find when assessment, flying dust pre-processes not up to standard, non-subregion and fills out
It buries, easily cause the problems such as percolate guide system silting more, the risk that heavy metal leaches pollution environment once again is higher.
In view of this, special propose the utility model.
Utility model content
The purpose of this utility model is to provide a kind of processing unit of landfill leachate leaching flying ash, described devices
Structure is simple, obvious processing effect, realizes " treatment of wastes with processes of wastes against one another " comprehensive utilization of resources, and resource utilization rate is high.
In order to realize the above-mentioned purpose of the utility model, the following technical scheme is adopted:
The processing method of landfill leachate leaching flying ash, includes the following steps:
Leaching processing is carried out to flying ash using landfill leachate.
The processing method of landfill leachate leaching flying ash described in the utility model, drenches flying dust with percolate
Filter is handled, the derivative by-product that flying dust is disposed as domestic rubbish disposal, has pore structure abundant, energy after particle packing
Pollutant in enough effectively absorption retention concentrates, mainly including organic matter etc.；Meanwhile percolate can be by the nocuousness weight in flying dust
The Leaching of flying dust is effectively reduced in metal dissolving.Also, to leaching, treated after flying dust carries out heating harmless treatment,
Its Leaching of Heavy Metals concentration further decreases, and has reached " household refuse landfill sites contamination control standard " (GB16889-2008) phase
Limit value requirement is answered, the flying dust slag after harmless treatment can be used as construction material use.
Preferably, the percolate is percolation liquid membrane concentrate.It is furthermore preferred that the percolate is that percolate nanofiltration membrane is dense
Contracting liquid.
Compared to landfill leachate, film concentrate contains the inorganic salts and persistent organic pollutants of high concentration.Wherein, nanofiltration
Film concentrate is in brownish black, and containing a large amount of humus materials, COD concentration is high, compares reverse osmosis concentrated liquid, nanofiltration membrane concentrate
Processing disposition difficulty is bigger.The utility model passes through the processing method of landfill leachate leaching flying ash, nanofiltration membrane concentrate
Poisonous metal in flying dust can be dissolved out, reduces the Leaching of flying dust, also, flying dust can reduce the pollution such as organic in percolate
The concentration of object reduces COD.
Preferably, leaching processing is carried out to flying dust using percolate, until leachates coloration and conductivity are constant, reaches leaching
Filter terminal.
Specifically, water outlet can be started with filled column as timing point, successively leachates then are taken every 10-12h, measure coloration
And conductivity illustrates the nocuousness weight that percolate has been fully dissolved out in flying dust when leachates coloration and constant stable conductivity
The substances such as metal, processing terminate for leaching, reaches leaching terminal.
Preferably, the rate of the leaching processing is 40-80mL/h.
The rate of leaching processing has more important meaning to the effect that leaching is handled, by the rate for limiting leaching processing
Within the above range, it comes into full contact with percolate with fly ash granule to exchange, effectively the pollutant in absorption retention percolate, and fills
Divide and dissolves out the harmful heavy metal etc. in flying dust.As in different embodiments, the rate of the leaching processing can for 40mL/h,
45mL/h, 50mL/h, 55mL/h, 60mL/h, 65mL/h, 70mL/h, 75mL/h, 80mL/h etc..
Preferably, when the leaching is handled, the packed height of flying dust is 5-25cm.
Using above-mentioned flying dust packed height, fly ash granule is set sufficiently to retain the pollutant in percolate, while simultaneous
Gu Youxiao is dissolved out and is eluted the harmful heavy metal in flying dust etc..
As in different embodiments, the packed height of flying dust can for 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, 11cm,
12cm, 13cm, 14cm, 15cm, 16cm, 17cm, 18cm, 19cm, 20cm, 21cm, 22cm, 23cm, 24cm, 25cm etc.
Preferably, before leaching processing, pre- full water process is carried out to flying dust using percolate.It is furthermore preferred that the pre- full water
The full water liquid-solid ratio of processing is 0.6-1L/kg, preferably 0.7-0.9L/kg, more preferably 0.8L/kg.
Pre- full water process is carried out to flying dust using percolate, after infiltrating fly ash granule first by percolate, then carries out leaching
Processing improves wellability, and then improves elution efficiency.
Preferably, the method for the leaching processing includes: to make flying dust filled column containing flyash ingredient, using percolate pair
Flying dust filled column carries out leaching processing.It is furthermore preferred that the flying dust filled column includes quartz sand, flying dust, quartz sand from the bottom to top.
Nylon wire interval is preferably used between quartz sand and flying dust.
Preferably, the partial size of the quartz sand is 60-100 mesh, preferably 70-90 mesh, more preferably 80 mesh.More preferably
, the filling height of the quartz sand is 4-5cm.
Preferably, the aperture of the nylon wire is 0.08-0.12mm, preferably 0.09-0.11mm, more preferably 0.1mm.
It preferably, can be to through leaching, treated that flying dust heats.The temperature of the heat treatment is 300-
1200℃.It is furthermore preferred that the temperature of the heat treatment is 800-1200 DEG C.Such as without heat treatment, only by leaching
Reason, can make the elution efficiency 60=80% of villaumite in flying dust；The elution efficiency of Pb is 20-55%, and Leaching reduces
70-88%；To leaching, treated that flying dust heats, and can further decrease heavy metal volatility and Leaching.
After above-mentioned heat treatment, the organic matter through fly ash granule absorption retention decomposes removing under heat effect, also,
After heat treatment, the heavy metal in fly ash granule can be effectively removed, and as the temperature increases, raising heavy metal such as Pd,
The removal rate of Cd, Zn, Cu, Cr etc. further decrease the Leaching Heavy Metals of flying dust.
Preferably, the time of the heat treatment is 0.2-2h, preferably 0.5-1h.
Preferably, heated under air atmosphere.It is furthermore preferred that air mass flow is 1-3L/min, preferably 2L/
min。
Preferably, the tail gas that the heat treatment generates discharges after soda acid absorption processing.
The utility model additionally provides a kind of processing unit of landfill leachate leaching flying ash, including percolate accommodating
Unit and leaching unit；The leaching unit includes flying dust packed column；At the top of the percolate accommodating unit and flying dust packed column
Connection.
The processing unit of landfill leachate leaching flying ash described in the utility model, structure is simple, and percolate is held
It sets unit to be connected to flying dust packed column, leaching processing is carried out to flying dust using percolate as leaching liquid, reduces the leaching of flying dust
Toxicity, and the concentration of pollutant in percolate is reduced, obvious processing effect is easy to operate.
Preferably, it is connected between the percolate accommodating unit and flying dust packed column by conduit.On the conduit preferably
It is provided with flow control valve, to adjust the rate of leaching processing.
Preferably, the flying dust packed column includes cylinder and filler, and the filler is filled in cylinder, and the filler is under
Supreme includes quartz sand layer, flying dust layer, quartz sand layer.Nylon wire interval is preferably used between quartz sand layer and flying dust layer.It is more excellent
Choosing, it is provided with uniform liquid distributor above the filler, so that percolate, after uniform liquid distributor, uniformly leaching is on filler.
The cylinder of packed column can be selected according to actual needs, it is preferred to use Organic glass column avoids corroding.
Preferably, the cylinder bottom is provided with leachates buffer area, the leachates handled for buffering leaching.Institute
It states leachates buffer area bottom and is provided with water check valve, for opening or closing leaching treatment process.
Preferably, the percolate accommodating unit includes that percolate installs container, and top is provided with injection port, air inlet pipe
And exhaust outlet.The air inlet pipe extends to bottom in percolate accommodating unit.So that leaching process carry out under constant-pressure conditions.Such as
Markov bottle can be used in the percolate accommodating unit.
Compared with prior art, the utility model has the following beneficial effects:
(1) processing unit of landfill leachate leaching flying ash described in the utility model, with percolate to flying dust into
Row leaching is handled, the derivative by-product that flying dust is disposed as domestic rubbish disposal, has hole knot abundant after particle packing
Structure can effectively be adsorbed pollutant in retention concentrate, mainly including organic matter etc.；Meanwhile percolate can will be in flying dust
Harmful heavy metal dissolution, is effectively reduced the Leaching of flying dust；
(2) processing unit of landfill leachate leaching flying ash described in the utility model, structure is simple, by percolate
It installs container to be connected to flying dust packed column, leaching processing is carried out to flying dust using percolate as leaching liquid, reduces the leaching of flying dust
Toxicity out, and the concentration of pollutant in percolate is reduced, obvious processing effect is easy to operate.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural representation of the processing unit of landfill leachate leaching flying ash provided by the embodiment of the utility model
Figure.
Appended drawing reference:
1- percolate installs container；2- flying dust packed column；11- injection port；
12- air inlet pipe；13- exhaust outlet；14- flow control valve；
The uniform liquid distributor of 21-；The first quartz sand layer of 22-；The first nylon wire of 23-；
24- flying dust layer；The second nylon wire of 25-；The second quartz sand layer of 26-；
27- leachates buffer area；28- water check valve；29- receives container.
Specific embodiment
The technical solution of the utility model is clearly and completely retouched below in conjunction with the drawings and specific embodiments
It states, it will be appreciated by those skilled in the art that following, the embodiments are a part of the embodiments of the present invention, without
It is whole embodiments, is merely to illustrate the utility model, and is not construed as limitation the scope of the utility model.It is practical based on this
Embodiment in novel, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, is fallen within the protection scope of the utility model.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer
It is recommended that condition carry out.Reagents or instruments used without specified manufacturer is the routine that can be obtained by commercially available purchase
Product.
It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
Fig. 1 is the structural representation of the processing unit of landfill leachate leaching flying ash provided by the embodiment of the utility model
Figure.The processing unit of the landfill leachate leaching flying ash, including percolate accommodating unit and leaching unit.The leaching
Unit includes flying dust packed column 2, is connected at the top of the percolate accommodating unit and flying dust packed column 2.The leaching unit is used for
Leaching processing is carried out to flying dust using percolate.
The percolate accommodating unit includes that percolate installs container 1.The percolate install be provided at the top of container 1 into
Sample mouth 11, air inlet pipe 12 and exhaust outlet 13.The injection port 11 is used for the addition of percolate, and preferably band cock provides closed
Environment.The air inlet pipe 12 extends to percolate and installs bottom in container 1, so that leaching process carry out under constant-pressure conditions.Such as
The percolate, which installs container 1, can be used Markov bottle.
The leaching unit includes flying dust packed column 2；The percolate installs to be passed through at the top of container 1 and flying dust packed column 2
Conduit connection.Flow control valve 14 is provided on the conduit, to adjust the rate of leaching processing.
The flying dust packed column 2 includes cylinder and filler, and the filler is filled in cylinder, and the filler wraps from the bottom to top
Include the second quartz sand layer 26, the second nylon wire 25, flying dust layer 24, the first nylon wire 23, the first quartz sand layer 22, first stone
Uniform liquid distributor 21 is provided with above sand layer 22, so that percolate, after uniform liquid distributor 21, uniformly leaching is on filler.It fills out
The cylinder for filling column can be selected according to actual needs, it is preferred to use Organic glass column avoids corroding.
The flying dust layer 24 enables fly ash granule sufficiently to retain percolate through appropriate compacting, packed height 5-25cm
In pollutant, combine and effectively dissolve out and elute the harmful heavy metal in flying dust.The partial size of the quartz sand used is 60-
100 mesh, preferably 70-90 mesh, more preferably 80 mesh.The filling height of first quartz sand layer 22 and the second quartz sand layer 26
For 4-5cm.The aperture of the nylon wire is 0.08-0.12mm, preferably 0.09-0.11mm, more preferably 0.1mm.
The cylinder bottom is provided with leachates buffer area 27, the leachates handled for buffering leaching.The leaching
27 bottom of liquid buffer area is provided with water check valve 28 out, for opening or closing leaching treatment process.28 bottom of water check valve is set
It is equipped with and receives container 29, for receiving leachates.
The processing method of landfill leachate leaching flying ash described in the utility model, includes the following steps:
(1) according to quartz sand, nylon wire, flying dust, quartz sand, nylon wire, uniform cloth liquid are followed successively by cylinder from the bottom to top
The sequentially built flying dust filled column of device, filled column load after, using percolate nanofiltration membrane concentrate to flying dust filled column into
The pre- full water process of row；
(2) flow control valve that percolate installs container is closed, percolate is added in percolate nanofiltration membrane concentrate and is installed
In container, and it is spare to cover cock；
(3) percolate is installed and is connected at the top of container and flying dust filled column, and guarantee airtightness；It adjusts percolate and installs and hold
The speed that the flow control valve of device is handled to specified leaching opens the water check valve of flying dust filler column bottom, starts to carry out at leaching
Reason；
(4) water outlet is started as timing point with filled column, then takes a leachates every 10-12h, measure coloration and conductance
Rate reaches leaching terminal when the coloration of leachates and constant stable conductivity, leaching processing is completed.
The percolate nanofiltration membrane concentrate that various embodiments of the utility model uses is percolate from garbage filling field through " anaerobism is raw
Object+MBR+NF/RO " technical matters treatment process, the concentrate of NF unit retention, flying dust are that garbage burning factory grate furnace burns work
The ash content that the flue gas that skill generates is retained through bag filter
The design parameter of each step is as shown in table 1 below:
The condition of the different leaching processing of table 1
Note: wherein embodiment 2 and embodiment 5 are parallel laboratory test
Experimental example 1
Using China " the measurement rapid-digestion spectrophotometry of water chemical oxygen demand " (HJ/T 399-2007), " water
The measurement silver nitrate titration method of matter chloride " (GB 11896-89) and " measurement inductive coupling of solid waste metallic element etc. from
Daughter mass spectrography " the methods of (HJ 766-2015) in the untreated percolate nanofiltration membrane concentrate in the utility model
COD, chloride and heavy metal are measured, and the results are shown in Table 2.Using China's " solid waste Leaching leaching method level vibration
Swing method " (HJ 557-2009) method is measured the Leaching of flying dust untreated in the utility model, the results are shown in Table
3。
2 nanofiltration membrane concentrate chloride of table and Analysis of Heavy Metals
The Leaching (mg/L) of 3 flying dust of table
| Project | Measured value | Standard limited value |
| pH | 11.84 | — |
| Pb | 21.34 | 0.25 |
| Zn | 9.3 | 100 |
| Cu | 0.91 | 40 |
| Cd | 0.0013 | 0.15 |
| Cr | 2.84 | 4.5 |
Note: standard limited value is 1 limit value of table in GB 16889-2008
The influence of effect is eluted to villaumite in flying dust and heavy metal in order to probe into the rate of different leaching processing, film is concentrated
The influence of COD removal effect in liquid is 15cm to flying dust layer height is fixed in embodiment 1-3,40mL/h, 60mL/ is respectively set
H, the leaching rate of 80mL/h, leaching is before and after the processing respectively according to national environmental protection professional standard HJ/T 399-2007, GB
11896-89 and HJ 766-2015 method carries out the measurement of fluid sample COD, chloride and heavy metal, according to HJ 557-2010
Method carries out Leaching analysis, test result such as table 4 to solid sample.
The different leaching rates of table 4 elute measure of merit result to villaumite in concentrate COD removal, flying dust and heavy metal
In order to probe into influence to villaumite in flying dust and heavy metal elution effect of the packed heights of different flying dust layers, dense to film
The influence of COD removal effect in contracting liquid, to the leaching rate for fixing 60mL/h in embodiment 4,5 and 6, the height of flying dust layer is distinguished
For 15cm, 5cm, 25cm, leaching is before and after the processing respectively according to national environmental protection professional standard HJ/T 399-2007, GB
11896-89 and HJ 766-2015 method carries out the measurement of fluid sample COD, chloride and heavy metal, according to HJ 557-2010
Method carries out Leaching analysis, test result such as table 5 to solid sample.
The different flying dust layer heights of table 5 elute measure of merit result to villaumite in concentrate COD removal, flying dust and heavy metal
From upper table it is found that with flying dust layer packed height reduction, percolate nanofiltration membrane concentration in leaching treatment process
Liquid enhances the elution efficiency of pollutant in flying dust.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (10)
1. the processing unit of landfill leachate leaching flying ash, which is characterized in that including percolate accommodating unit and leaching list
Member；The leaching unit includes flying dust packed column；It is connected at the top of the percolate accommodating unit and flying dust packed column.
2. the processing unit of landfill leachate leaching flying ash according to claim 1, which is characterized in that the diafiltration
It is connected between liquid accommodating unit and flying dust packed column by conduit.
3. the processing unit of landfill leachate leaching flying ash according to claim 2, which is characterized in that the conduit
On be provided with flow control valve.
4. the processing unit of landfill leachate leaching flying ash according to claim 1, which is characterized in that the flying dust
Packed column includes cylinder and filler, and the filler is filled in cylinder, and the filler includes quartz sand layer, flying dust from the bottom to top
Layer, quartz sand layer.
5. the processing unit of landfill leachate leaching flying ash according to claim 4, which is characterized in that the filler
Top is provided with uniform liquid distributor.
6. the processing unit of landfill leachate leaching flying ash according to claim 4, which is characterized in that the quartz
The partial size of sand is 60-100 mesh.
7. the processing unit of landfill leachate leaching flying ash according to claim 4, which is characterized in that the quartz
The filling height of sand is 4-5cm.
8. the processing unit of landfill leachate leaching flying ash according to claim 1, which is characterized in that the diafiltration
Liquid accommodating unit includes that percolate installs container, and top is provided with injection port, air inlet pipe and exhaust outlet；The air inlet pipe extends
Bottom in container is installed to percolate.
9. the processing unit of landfill leachate leaching flying ash according to claim 8, which is characterized in that the diafiltration
It is Markov bottle that liquid, which installs container,.
10. the processing unit of landfill leachate leaching flying ash according to claim 4, which is characterized in that the column
Body bottom is provided with leachates buffer area；Leachates buffer area bottom is provided with water check valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109047295A (en) * | 2018-09-12 | 2018-12-21 | 中国环境科学研究院 | The processing method and processing device of landfill leachate leaching flying ash |
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| CN109047295A (en) * | 2018-09-12 | 2018-12-21 | 中国环境科学研究院 | The processing method and processing device of landfill leachate leaching flying ash |
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