CN109942134A - A kind of processing system and its processing method of landfill leachate - Google Patents
A kind of processing system and its processing method of landfill leachate Download PDFInfo
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- CN109942134A CN109942134A CN201910241903.1A CN201910241903A CN109942134A CN 109942134 A CN109942134 A CN 109942134A CN 201910241903 A CN201910241903 A CN 201910241903A CN 109942134 A CN109942134 A CN 109942134A
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Abstract
The invention discloses a kind of processing system of landfill leachate and its processing methods, comprising: sedimentation basin, filtering ponds, evaporator, the sedimentation basin are used for percolate chemical treatment in sedimentation basin to generate precipitating；The filtering ponds are connect with the sedimentation basin, for filtering the supernatant after percolate is chemically treated；The evaporator is connect with the filtering ponds, is handled for percolate evaporation and concentration after filtering.Percolate in sedimentation basin is chemically treated, carbonate hardness, corresponding basicity and the salt content in raw water can be reduced；Then percolate supernatant after chemical treatment is filtered by filtering ponds；Finally supernatant after filtering is handled by evaporator evaporation and concentration, it is ensured that the stabilization and qualified discharge of effluent quality, while the concentrate after concentrate goes recharge to fill, and reaches zero-emission processing.The present embodiment is small by water quality impact, treatment effeciency is high, economic performance is good, technology chain is short, is a kind of emerging, efficient, strong applicability highly concentrated salt-containing waste water treatment method.
Description
Technical field
The present invention relates to field of waste water treatment, the processing system and its processing method of especially a kind of landfill leachate.
Background technique
Landfill leachate is mostly high COD, high ammonia nitrogen, the brown stench waste water containing contents of many kinds of heavy metal ion, wherein each dirt
Have a finger in every pie mark much higher than Normal wastewater, and further comprise a variety of cause of diseases, microorganism, carcinogenic organic substance and heavy metal etc.,
If without processing direct emission high risks can be caused to natural environment and human society.Meanwhile landfill leachate due to
Have the characteristics that complicated organism kinds, ammonia nitrogen and tenor height, change of water quality are big, the difficulty of processing is comparable big.
The huge but further treating capacity of the average daily yield of the landfill leachate in China is less than half at present, so
And processing requirement can reach related water pollution concentration of emission limit value while having certain processing landfill leachate ability
The refuse landfill of standard is seldom.
In the prior art, the processing method of landfill leachate mainly includes embrane method, biochemical method two major classes, but these processing sides
The generally existing some problems of method: embrane method takes up a large area, maintenance rate is high, service life is short, and to the salinity of influent quality, again
Metal etc. has strict demand；Using conventional biologic treating technique, it is affected by variation water quality, especially " middle old-age group " is filled out
The landfill leachate treatment ability for burying field is low；Although COD and ammonia nitrogen may be implemented in general physico-chemical process and conventional high level oxidizing process
High removal rate, but it is too high using these methods processing percolate expense, it is not suitable for being widely applied in practice.
In order to improve status, application of city life garbage harmless treatment efficiency is improved, improves living environment, it would be highly desirable to seek one kind
Treatment effeciency is high, is applicable in that ability is wide, technology chain is short, economy, the low method for treating garbage percolation liquid of operating cost and implements this
The processing system of processing method becomes the urgent need in market.
Summary of the invention
The present invention is directed to solve one of the technical problems existing in the prior art at least to some extent.For this purpose, of the invention
First purpose be to propose a kind of processing system of landfill leachate, treatment effect of the processing system to landfill leachate
It is good, and be that overall structure is simple, emerging, energy saving, efficient, strong applicability highly concentrated brine waste processing new system.
Second object of the present invention is to propose a kind of processing method of landfill leachate, this method efficient stable, right
The treatment effect of landfill leachate is good, wide adaptability, simple to operation, technology chain is short.
In order to achieve the above object, first aspect present invention embodiment proposes a kind of processing system of landfill leachate, comprising:
Sedimentation basin is located at the supernatant on upper layer and positioned at the precipitating of lower layer to generate to percolate chemical treatment in sedimentation basin
Object；
Filtering ponds are connect with the sedimentation basin, for being filtered to the supernatant after chemical treatment；
Evaporator is connect with the filtering ponds, for being evaporated concentration to supernatant after filtering.
Preferably, the evaporator is vertical single process shell and tube evaporator, the vertical single process shell and tube evaporator
With diameter circulating line at a gulp.
Preferably, the chemical treatment is manually launches liquid alkaline and/or soda ash into the sedimentation basin, is used for and percolate
Reaction generates precipitating, flocculant and/or flocculation aid can be also manually launched into the sedimentation basin, for making percolate quickly sink
It forms sediment.
Preferably, the flocculant is PAC, and the flocculation aid is PAM.
Preferably, the sedimentation basin is flocculation sedimentation integral pool, and the chemical process time is 60min~120min.
Preferably, further include filter press, connect with the sedimentation basin, the sediment of the precipitating bottom of pond portion passes through the pressure
Filter processing forms solids and pressing filtering liquid.
Preferably, the filter press is van-type plate and frame filter press.
Preferably, further include conditioning tank, connect with the sedimentation basin, for being buffered naturally to percolate, to ensure to enter
The homogeneity of the percolate of the sedimentation basin.
In order to achieve the above object, second aspect of the present invention embodiment proposes a kind of processing method of landfill leachate, including
Following steps:
Percolate is chemically treated to generate and be located at the supernatant on upper layer and positioned at the sediment of lower layer；
Supernatant after chemical treatment is filtered；
Concentration, the processing of gained Concentrated liquid recharge, gained distilled water qualified discharge are evaporated to supernatant after filtering.
Preferably, the step in the chemical treatment includes: that liquid alkaline and/or soda ash are added in percolate to be used to and diafiltration
Liquid reaction generates precipitating, can add flocculant and/or flocculation aid into percolate also to accelerate reaction rate.
It preferably, is 60min~120min to the percolate chemically treated time.
Preferably, after being chemically treated to percolate, the sediment of generation is subjected to filters pressing processing, wherein produce after filters pressing
Raw solids landfill, the pressing filtering liquid return generated after filters pressing re-start chemical treatment.
Preferably, the evaporator is vertical single process shell and tube evaporator, the vertical single process shell and tube evaporator
With diameter circulating line at a gulp, the flow velocity of the heavy caliber circulating line is 1.5-3.0m/s.
Preferably, the evaporator is MCE forced-circulation evaporator.
Further preferably, the evaporator is vertical single process tubulation external-heat forced-circulation evaporator.
Preferably, the material of the vertical single process shell and tube evaporator is titanium.
Preferably, before being chemically treated to percolate, percolate is buffered naturally, for ensuring the diafiltration into rear end
The homogeneity of liquid.
One technical solution of above-mentioned technical proposal at least has the following advantages that or one of beneficial effect: implementation of the invention
Example combines physics and chemical treatment technology, buffers naturally first in conditioning tank to percolate, it can be ensured that into the infiltration of rear end
The homogeneity of filtrate；Secondly percolate in sedimentation basin is chemically treated, carbonate hardness, the corresponding basicity in raw water can be reduced
And salt content；Then it is filtered by filtering ponds to the supernatant that percolate chemical treatment generates in sedimentation basin；After finally filtering
Supernatant handled by evaporator evaporation and concentration, it is ensured that the stabilization and qualified discharge of effluent quality, while dense after concentrate
Contracting liquid goes recharge to fill, and reaches zero-emission processing.The present embodiment is small by water quality impact, treatment effeciency is high, economic performance is good, technique
Chain is short, system equipment long service life, is a kind of emerging, energy saving, efficient, strong applicability highly concentrated brine waste processing system.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the overall flow figure of the processing method of landfill leachate of the embodiment of the present invention.
Specific embodiment
This part will be described in specific embodiments of the present invention, and the preferred embodiments of the invention is shown in the accompanying drawings, attached
The effect of figure be with figure remark additionally book word segment description, enable a person to intuitively, visually understand of the invention
Each technical characteristic and overall technical architecture, but it should not be understood as limiting the scope of the invention.
In the description of the present invention, it is to be understood that, be related to orientation description, for example, above and below, front, rear, left and right etc.
The orientation or positional relationship of instruction be based on attached orientation or positional relationship shown in FIG. 1, be merely for convenience of the description present invention and
Simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construction
And operation, therefore be not considered as limiting the invention.
In the description of the present invention, several to be meant that one or more, it is multiple to be meant that two or more, be greater than,
Be less than, more than etc. be interpreted as not including this number, it is above, following, within etc. be interpreted as including this number.If there is being described to first,
Second is only intended to for the purpose of distinguishing technical characteristic, is not understood to indicate or imply relative importance or implicitly indicates institute
The quantity of the technical characteristic of instruction or the precedence relationship for implicitly indicating indicated technical characteristic.
In the present invention, unless otherwise restricted clearly, the words such as " setting ", " installation ", " connection " be shall be understood in a broad sense, example
Such as, it can be directly connected, it can also be indirectly connected through an intermediary；It may be a fixed connection, be also possible to detachably connect
It connects, can also be integrated molding；It can be mechanical connection；It can be the connection inside two elements or the phase interaction of two elements
With relationship.Skilled artisan can rationally determine above-mentioned word in the present invention with the particular content of combination technology scheme
In concrete meaning.
First aspect present invention embodiment proposes a kind of processing system of landfill leachate, comprising:
Sedimentation basin is located at the supernatant on upper layer and positioned at the precipitating of lower layer to generate to percolate chemical treatment in sedimentation basin
Object；
Filtering ponds are connect with the sedimentation basin, for being filtered to the supernatant after chemical treatment；
Evaporator is connect with the filtering ponds, for being evaporated concentration to supernatant after filtering.
Using the technical solution of the present embodiment, percolate in sedimentation basin is chemically treated first, the carbon in raw water can be reduced
Hydrochlorate hardness, corresponding basicity and salt content；Then it is filtered by filtering ponds to percolate chemical treatment generation in sedimentation basin
In supernatant, typically contain the suspended matter for having not enough time to precipitate in sedimentation basin in time in the supernatant, part coagulant, help it is solidifying
The bulky grains complex compound such as agent；Finally supernatant after filtering is handled by evaporator evaporation and concentration, it is ensured that effluent quality it is steady
Fixed and qualified discharge, while the concentrate after concentrate goes recharge to fill, and reaches zero-emission processing.The embodiment of the present invention is by water quality shadow
Sound is small, treatment effeciency is high, economic performance is good, technology chain is short, system equipment long service life, is a kind of emerging, energy saving, high
Effect, the highly concentrated brine waste processing system of strong applicability.
In certain embodiments, the evaporator is vertical single process shell and tube evaporator, the vertical single process tubulation
Formula evaporator has diameter circulating line at a gulp.The vertical single process shell and tube evaporator have heat transfer efficiency height, resistance to salting-out,
Resistive connection scar is readily cleaned, the features such as cocnentration factor is high, producing water ratio is high, overcomes a variety of heat exchangers in processing percolate stoste
Drawback substantially reduces traditional percolate biochemistry+advanced treating (membrane process) and faces high-frequency cleaning, is easy to lacking for blocking
Point.
In certain embodiments, the chemical treatment is that liquid alkaline and/or soda ash are manually launched into the sedimentation basin,
In, the liquid alkaline is sodium hydroxide, and the soda ash is sodium carbonate, generates sediment, the sediment for reacting with percolate
Generally CaCO3 and Mg (OH) 2；Flocculant and/or flocculation aid can be also manually launched into the sedimentation basin, for making percolate
Rapid precipitation, wherein the flocculant is preferably PAC, and the flocculation aid is preferably PAM.It certain flocculant and described helps
Solidifying agent can also be other chemical agent, and flocculant and flocculation aid in the market is very universal, and purchase is facilitated to use.
In certain embodiments, the sedimentation basin be flocculation sedimentation integral pool, the chemical process time be 60min~
120min.The flocculation sedimentation integral pool is that can carry out adding liquid alkaline and/or soda ash in pond to carry out at chemical precipitation
Reason, and the rate that flocculant and flocculation aid are used to accelerate to precipitate can be added and saved by being set as flocculation sedimentation integral pool
Space, and can accelerate reaction rate, shorten the reaction time, enhances treatment effeciency.
In certain embodiments, further include filter press, connect with the sedimentation basin, the sediment of the precipitating bottom of pond portion is logical
It crosses the filter press processing and forms solids and pressing filtering liquid.By adding the filter press, precipitating can be further handled
The sediment filters pressing of sedimentation basin bottom of pond is solids, transport is facilitated to fill by the sediment in pond, and the pressing filtering liquid being press-filtered out is again
It returns and is further chemically treated in sedimentation basin, then can make to be chemically treated incomplete percolate and handle again, enhance chemistry
The effect of processing.
In certain embodiments, further include conditioning tank, connect with the sedimentation basin, for being buffered naturally to percolate, with
Ensure the homogeneity into the percolate of the sedimentation basin.It should be noted that in the above embodiments, can add a tune
Section pond is connect with sedimentation basin, and conditioning tank preferably uses large capacity buffer pool, and buffer memory capacity is preferably not less than 10 days storage levels, passes through
Conditioning tank can sufficiently summarize each percolate dry point promotion and come to be percolate, ensure the uniform, steady of the percolate for entering rear end
It is fixed.
The present invention also provides a kind of specific workflows of the processing system of the landfill leachate originally implemented, first
The percolate extracted out from landfill yard hole to be provided is lifted by elevator pump into conditioning tank, in the conditioning tank, to infiltration
Filtrate carries out nature buffering, to ensure the homogeneity into the percolate of the sedimentation basin；Then the percolate in conditioning tank is again
It is promoted by elevator pump into flocculation sedimentation integral pool；By chemically treated method, it is heavy to generate to be handled percolate
It forms sediment；Then supernatant of the percolate in flocculation sedimentation integral pool after chemical treatment is by the high-precision filtration in filtering ponds
After device filtering, entered in evaporator by elevator pump, preferably single process shell and tube evaporator；Bottom precipitation in sedimentation basin
Object, the sediment mostly exist with sludge form, are then transported in van-type plate and frame filter press by sludge conveyer, filters pressing at
After fixture, fixture is transported outward and is filled, the pressing filtering liquid generated after filters pressing re-starts chemistry back to flocculation sedimentation integral pool
Processing；The supernatant filtered finally by filtering ponds is concentrated by evaporation in single process shell and tube evaporator, reaches requirement concentration
Concentrate afterwards is returned by discharging pump fills factory's progress recharge processing, and the distilled water qualified discharge that evaporative condenser comes out.
Second aspect of the present invention embodiment proposes a kind of processing method of landfill leachate, comprising the following steps:
Percolate is chemically treated to generate and be located at the supernatant on upper layer and positioned at the sediment of lower layer；
Supernatant after chemical treatment is filtered；
Concentration is evaporated to supernatant after filtering.
Using the technical solution of the present embodiment, the method for the processing landfill leachate that the present embodiment proposes combines physics
And chemical treatment technology, percolate is chemically treated first, carbonate hardness, corresponding basicity and the saliferous in raw water can be reduced
Amount；Then supernatant of the percolate into after being chemically treated excessively is filtered, typically contains in sedimentation basin and has not enough time in the supernatant
The suspended matter precipitated in time, the bulky grains complex compound such as part coagulant, flocculation aid；After finally filtering at supernatant evaporation and concentration
Reason, it is ensured that the stabilization and qualified discharge of effluent quality, while the concentrate after concentrate goes recharge to fill, and reaches zero-emission processing.
The method of the processing landfill leachate of the present embodiment is small by water quality impact, treatment effeciency is high, economic performance is good, technology chain is short,
It is a kind of emerging, energy saving, efficient, strong applicability highly concentrated salt-containing waste water treatment method.
In certain embodiments, as shown in Figure 1, added in the chemical treatment into percolate liquid alkaline and/or soda ash with
Generate precipitating for reacting with percolate, can also be added into percolate in the chemical treatment flocculant and/or flocculation aid with
Accelerate reaction rate.Wherein, the flocculant is preferably PAC, and the flocculation aid is preferably PAM, certain flocculant and institute
Stating flocculation aid can also be other chemical agent, and flocculant and flocculation aid in the market is very universal, and purchase is facilitated to use.It needs
Illustrate, in the chemical treatment of percolate in the present embodiment, liquid alkaline, soda ash are preferred chemical treatments, this implementation
The purpose of example is generation CaCO3 and 2 sediment of Mg (OH), reduces the hardness and basicity in water, all to pass through chemistry
Reaction generates the chemistry agent of CaCO3 and 2 sediment of Mg (OH), in the protection scope of the present embodiment.In combination with flocculation
Agent (PAC), flocculation aid (PAM) are added, and nascent state CaCO3 and Mg (OH) 2 sediment with huge surface area was precipitating
Suspended matter, colloid, bacterium and the virus etc. in raw water are largely adsorbed in journey, and raw water is made to be purified.
In certain embodiments, after being chemically treated to percolate, the sediment of generation is subjected to filters pressing processing, wherein
Solids landfill after filters pressing, the pressing filtering liquid return after filters pressing re-start chemical treatment.It, will by handling sediment filters pressing
The sediment filters pressing of sedimentation basin bottom of pond is solids, and transport is facilitated to fill, and the pressing filtering liquid being press-filtered out returns again to further chemistry
Processing, then can make to be chemically treated incomplete percolate and handle again, enhance the effect of processing.
In certain embodiments, as shown in Figure 1, gained concentrate returns after it will filter after the processing of percolate evaporation and concentration
Filling processing, gained distilled water qualified discharge.It should be noted that the distilled water that the evaporative condenser comes out meets " house refuse
Landfill yard contamination control standard " 2 standard of table in GB16889-2008, and underproof concentrate return again landfill factory into
Row recharge processing, can repeatedly be handled below standard percolate, until reach country can discharge standard, the present embodiment can reach zero
Discharge the purpose of landfill leachate.
In certain embodiments, the evaporator is vertical single process shell and tube evaporator, specific as MCE forced circulation is steamed
Send out device, the forced-circulation evaporator of more specific such as model MCE-200tpd, MCE forced-circulation evaporator pearl in middle mountain
There are production and sales in Environmental Protection Technology Co., Ltd.The vertical single process shell and tube evaporator has diameter circulating line at a gulp,
The flow velocity of the heavy caliber circulating line is 1.5-3.0m/s.In flow process, moment heat exchanging device tube wall plays percolate
Souring, have the characteristics that heat transfer efficiency height, resistance to salting-out, resistive connection scar, be readily cleaned, cocnentration factor is high, producing water ratio is high, overcome
Drawbacks of a variety of heat exchangers in processing percolate stoste, substantially reduce traditional percolate biochemistry+advanced treating (film work
Skill) face high-frequency cleaning, be easy to the shortcomings that blocking.
In certain embodiments, the material of the vertical single process shell and tube evaporator is titanium.By by evaporator
Material is set as titanium, and tool has good corrosion resistance, and surface is not likely to produce oxide layer, not pollution medium, environment-protecting and non-poisonous, and
Light weight, the service life is long, the heat exchange suitable for the solution such as hot water, oil, acid, alkali and steam, hot and cold water.
In certain embodiments, as shown in Figure 1, before being chemically treated to percolate, percolate is buffered naturally, is used for
Ensure the homogeneity into the percolate of rear end.It should be noted that in the above embodiments, being chemically treated to percolate
Before, percolate can be buffered first naturally, and then ensures the uniform, stable of the percolate for entering backend process, after convenient
Hold the progress of technique.
In the embodiment of the present invention, by the processing method of landfill leachate, not only can effectively decolouring and deodorizing, remove duplicate removal
Metal ion and ammonia nitrogen, while COD index can be significantly reduced, achieve the purpose that final process.In addition, implementing landfill leachate
The entire occupied area of the processing system of the landfill leachate of processing method is few, investment is lower, and thoroughly, instead to the processing of percolate
It answers rapid, without secondary pollution, can effectively overcome that the investment of current percolate treating process is high, maintenance cost is high, takes up a large area, locates
Manage the problems such as effect is undesirable.The embodiment of the present invention combines physics with chemical treatment method, can economically and efficiently remove
The various poisonous and harmful elements in landfill leachate are removed, discharge standard is met.
Preferable implementation of the invention is illustrated above, certainly, the present invention can also use and above-mentioned implementation
The different form of mode, those skilled in the art's made equivalent transformation on the premise of without prejudice to spirit of the invention
Or corresponding change, all it should belong in protection scope of the present invention.
Claims (10)
1. a kind of processing system of landfill leachate characterized by comprising
Sedimentation basin is located at the supernatant on upper layer and positioned at the sediment of lower layer to generate to percolate chemical treatment in sedimentation basin；
Filtering ponds are connect with the sedimentation basin, for being filtered to the supernatant after chemical treatment；
Evaporator is connect with the filtering ponds, for being evaporated concentration to supernatant after filtering.
2. a kind of processing system of landfill leachate according to claim 1, which is characterized in that the evaporator is vertical
Single process shell and tube evaporator, the vertical single process shell and tube evaporator have diameter circulating line at a gulp.
3. a kind of processing system of landfill leachate according to claim 1, which is characterized in that it further include filter press, with
The sediment of the sedimentation basin connection, the precipitating bottom of pond portion forms solids and pressing filtering liquid by the filter press processing.
4. a kind of processing system of landfill leachate according to claim 1 to 3, which is characterized in that further include adjusting
Pond is connect with the sedimentation basin, for buffering naturally to percolate, to ensure into the uniform of the percolate of the sedimentation basin
Property.
5. a kind of processing method of landfill leachate, which comprises the following steps:
Percolate is chemically treated to generate and be located at the supernatant on upper layer and positioned at the sediment of lower layer；
Supernatant after chemical treatment is filtered；
Concentration, the processing of gained Concentrated liquid recharge, gained distilled water qualified discharge are evaporated to supernatant after filtering.
6. a kind of processing method of landfill leachate according to claim 5, which is characterized in that the chemically treated step
Suddenly include: to add liquid alkaline and/or soda ash into percolate to be used to react generation precipitating with percolate, can also add into percolate
Add flocculant and/or flocculation aid to accelerate reaction rate.
7. a kind of processing method of landfill leachate according to claim 6, which is characterized in that be chemically treated to percolate
Time be 60min~120min.
8. a kind of processing method of landfill leachate according to claim 5, which is characterized in that percolate chemistry
After reason, the sediment of generation is subjected to filters pressing processing, wherein the solids landfill generated after filters pressing, the filters pressing generated after filters pressing
Liquid return re-starts chemical treatment.
9. a kind of processing method of landfill leachate according to claim 5, which is characterized in that the evaporator is vertical
Single process shell and tube evaporator, the vertical single process shell and tube evaporator have diameter circulating line at a gulp, the heavy caliber
The flow velocity of circulating line is 1.5-3.0m/s.
10. according to a kind of processing method of any landfill leachate of claim 5-9, which is characterized in that diafiltration
Before liquid chemical treatment, percolate is buffered naturally, for ensuring the homogeneity into the percolate of rear end.
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Cited By (1)
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