CN109574113A - A kind of processing unit and method for landfill leachate - Google Patents
A kind of processing unit and method for landfill leachate Download PDFInfo
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- CN109574113A CN109574113A CN201811592284.2A CN201811592284A CN109574113A CN 109574113 A CN109574113 A CN 109574113A CN 201811592284 A CN201811592284 A CN 201811592284A CN 109574113 A CN109574113 A CN 109574113A
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- evaporator
- heat exchanger
- import
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- landfill leachate
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- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 37
- 238000012545 processing Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 230000008676 import Effects 0.000 claims abstract description 49
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 33
- 238000003672 processing method Methods 0.000 claims abstract description 10
- 238000001704 evaporation Methods 0.000 claims description 32
- 238000001816 cooling Methods 0.000 claims description 18
- 230000008020 evaporation Effects 0.000 claims description 14
- 239000003513 alkali Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 description 13
- 239000012141 concentrate Substances 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 6
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 6
- 235000011130 ammonium sulphate Nutrition 0.000 description 6
- 239000010802 sludge Substances 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000011026 diafiltration Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003694 hair properties Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010129 solution processing Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/042—Prevention of deposits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention proposes a kind of processing units for landfill leachate, including pretreatment system, first evaporator, second evaporator, First Heat Exchanger, second heat exchanger, neutralizing tank, condensate water pot, pretreatment system is exported and is connected with the first evaporator import, first evaporator steam (vapor) outlet is connected with First Heat Exchanger import, First Heat Exchanger outlet is connected with neutralizing tank import, neutralizing tank outlet is connected with the second evaporator import, second evaporator steam (vapor) outlet is connected with the second heat exchanger import, second heat exchanger exit is connected with condensate water pot, second heat exchanger is arranged near the first evaporator.Due to taking cryogenic vacuum to evaporate, so that the fouling tendency of evaporator reduces, without pretreatment and equipment corrosion tendency is reduced, and extends service life of equipment, and make full use of the cheap energy.And a kind of processing method for landfill leachate is proposed, this method process is simple, and practical, the principle for meeting environmental protection and energy saving and efficiently utilizing is conducive to promote the use of.
Description
Technical field
The invention belongs to solution processing equipments, and in particular to a kind of processing unit and method for landfill leachate.
Background technique
Landfill leachate is the waste water generated in garbage loading embeading or interim stacking process, and water quality has high COD, and (chemistry needs
Oxygen amount, Chemical Oxygen Demand), high salt, high ammonia nitrogen, high heavy metal the features such as, and can be with landfill yard rubbish
It fills the time limit that ingredient, seasonal climate, landfill yard use and changes, be a kind of more intractable high concentrated organic wastewater.Mesh
Preceding country has put into effect the related discharge standard to landfill leachate treatment, has also come out correlation engineering design guidelines, according to for many years
Engineering practice, mainly use two kinds of processing routes at present, one is using two-stage DTRO technique, and one is that biochemistry+film is raw
Object reactor (MBR+NF+RO) technique, in certain areas since percolate concentration is especially high, process above even can not all be handled
In the case where operation, also there is the method for directly taking evaporation and concentration or burning.
The first two technique all due to using membrane technology, has the film concentrate of substantially about 20-30% to need into one
Step processing, it is generally the case that most techniques for using recharge for refuse landfill.But it is percolated returning for concentrated liquor
If filling that operation is lack of standardization or rainy season etc. all may cause the concentrate of recharge and flow back into leachate equalization basin, so that diafiltration
The COD and salt concentration of liquid are increased, and so as to cause the raising of film device operating pressure, rate of recovery decline, cleaning frequently, or causes
Biochemical system is unable to run, into vicious circle.Therefore need to the further minimizing of existing diafiltration concentrated liquor or into
The concentration disposition of one step, so it carries out concentrate zero-emission and is placed with the urgent market demand.
Now for the minimizing disposition of percolation liquid membrane concentrate, multifunctional evaporating equipment, MVR technique is used to set in the market
Standby, submersible burning process equipment, but certain defect is all individually present, cause system actually can not continuous and steady operation,
And operating cost is high, and generates secondary pollution.For example, the MVR that the patents such as CN108314115A and CN202744415U are mentioned
Technique.MVR technique be by electric drive vapour compression machine be evaporation energy supply in the way of be evaporated, it is comparatively energy saving, still
Technically there is following Railway Project: 1) evaporating temperature is high, is easy to cause fouling of heat exchangers, it is therefore desirable to which pretreatment is except hard, change
It learns except hard cost is higher；2) percolate evaporating temperature height easily generates foam, this part foam is easily accessible vapour compression machine, leads
Compressor fault is caused, is shortened the working life；3) evaporating temperature is high, and ammonia and the fixed gas needs of generation are further processed, not so
There is secondary pollution；4) due to salt content height, evaporating temperature is high, therefore more demanding to equipment material.For submersible burning work
It is that burning forms the side of thermal energy evaporation directly in evaporator using imflammable gas (such as biogas or natural gas) for skill
Formula, advantage are that the concentration that is that direct heat transfer can evaporate is higher, but is limited by the influence of energy-provision way, can only have it is flammable
It is just implementable in the case where gas, and in the case where no biogas stable supplying, it can be high using the energy consumption of natural gas.Thus
As it can be seen that propose a kind of recycling heat energy and not needing use MVR technique for landfill leachate evaporating concentrating method and
Equipment one of is a problem to be solved.
Summary of the invention
For the easy fouling of heat exchanger existing for above-mentioned MVR technique, it is also easy to produce foam vapour compression machine easy to damage, generation is waved
Hair property ammonia and fixed gas needs are further processed, more demanding to equipment material；And submersible burning technique is limited by confession
The problems such as energy mode, energy consumption is higher, the invention proposes a kind of processing units for landfill leachate, including pretreatment system
System, the first evaporator, the second evaporator, First Heat Exchanger, the second heat exchanger, neutralizing tank, condensate water pot, pretreatment system include
Pretreatment system outlet；First evaporator is equipped with the first evaporator import, the first evaporator steam (vapor) outlet, the concentration of the first evaporator
Liquid outlet；Second evaporator is equipped with the second evaporator import, the second evaporator steam (vapor) outlet, the second evaporator concentrated solution outlet；
First Heat Exchanger is equipped with First Heat Exchanger import and First Heat Exchanger exports；Second heat exchanger is equipped with the second heat exchanger import and the
Two heat exchanger exits；Neutralizing tank is equipped with neutralizing tank import and neutralizing tank exports；Wherein pretreatment system outlet and the first evaporator
Import is connected, and the first evaporator steam (vapor) outlet is connected with First Heat Exchanger import, First Heat Exchanger outlet and neutralizing tank import phase
Even, neutralizing tank outlet is connected with the second evaporator import, and the second evaporator steam (vapor) outlet is connected with the second heat exchanger import, and second
Heat exchanger exit is connected with condensate water pot, and the second heat exchanger is arranged near the first evaporator.
Preferably, the vacuum degree of the first evaporator is 40-50mbar, and the vacuum degree of the second evaporator is 110-120mbar.
Different vacuum degrees, which is arranged, can make the reduction of the boiling point of the first evaporator and the solution in the second evaporator, energy saving, simultaneously
Potential corrosion harmfulness and scaling tendency are reduced, so that equipment is without carrying out except hard pretreatment and later maintenance.
Preferably, acid or alkali are added in neutralizing tank to adjust the pH value for obtaining product.To obtain useful product for example
Ammonium sulfate, and this product can further evaporate recycling or meet discharge standard direct emission.
It preferably, further include the first storage tank, the second storage tank, the first storage tank includes the first storage tank import, and second
Storage tank includes the second storage tank import, and the first evaporator concentrated solution outlet is connected with the first storage tank import, the second evaporator
Concentrated solution outlet is connected with the second storage tank import.Final concentrate can be concentrated or into one in first storage tank with circulating and evaporating
Step is rationally handled, and the product in the second storage tank can further evaporate recycling or meet discharge standard direct emission.
Preferably, further include heat source and third heat exchanger, third heat exchanger be arranged in the second evaporator and with heat source phase
Even, heat source includes hot water or heat pump.Heat source is burnt by category sludge gas or pure electrically driven (operated) heat pump, can also pass through low product
Position steam carrys out heat supply, makes full use of the cheap energy.
Preferably, the second heat exchanger and the first evaporator carry out heat exchange to provide heat needed for evaporation for the first evaporator
Amount.Therefore the first evaporator does not need to be additionally provided heat source, recycles the heat in the second heat exchanger, with energy saving, subtracts
Few equipment cost and energy cost.
Preferably, First Heat Exchanger and the second heat exchanger include tubular heat exchanger or plate heat exchanger, third heat exchanger packet
Include coil heat exchanger.Relatively simple for structure, compact, convenient for safeguarding, the coil heat exchanger of tubular heat exchanger or plate heat exchanger
It is energy-efficient, good effect of heat exchange.
It preferably, further include cooling tower, condensate water pot is equipped with condensate water pot import and condensate water pot exports, and condensate water pot goes out
Mouth is connected with cooling tower.Condensed water is supplied cooling tower by condensate water pot, and condensed water is further transmitted and changed with first by cooling tower
Hot device, which carries out heat exchange, condenses the steam in First Heat Exchanger.
Preferably, cooling tower is arranged near First Heat Exchanger.The condensed water and First Heat Exchanger of cooling tower carry out
Heat exchange condenses the steam in First Heat Exchanger, energy saving to achieve the effect that.
It preferably, further include first circulation pump, the first vacuum pump, the second vacuum pump, first circulation pump setting is changed second
Between hot device and the first evaporator, for the liquid in the first evaporator of interior circulation and enter the heat exchange of the second heat exchanger, first is true
Sky pump is arranged on neutralizing tank, and vacuum is formed in neutralizing tank and the first evaporator to make, and the second vacuum pump is arranged in condensed water
On tank, vacuum is formed in condensate water pot and the second evaporator to make.First vacuum pump and the second vacuum pump are produced by condensation
Object forms vacuum, does not extract the steam of evaporator directly, the moving component of equipment is less, reduces maintenance maintenance cost.
The present invention also proposes a kind of processing method for landfill leachate, includes the following steps:
S1: percolate is introduced, and there is the first evaporator of the first vacuum degree to be evaporated, and the steam of generation is introduced the
One heat exchanger is condensed to obtain the first condensed water；
S2: the pH value of the first condensed water is adjusted, and the first condensed water is introduced to second evaporator with the second vacuum degree
In, to be evaporated processing to the first condensed water；
S3: the steam generated in the second evaporator and the second heat exchanger is made to carry out heat exchange to obtain the second condensed water.
In a further embodiment, step S3 further includes collecting the second condensed water and the second condensed water and first being made to exchange heat
Device carries out heat exchange.Condense the steam in First Heat Exchanger energy saving to achieve the effect that.
In a further embodiment, step S3 further includes providing heat source for the second evaporator.Heat source includes hot water or heat
Pump can also can be made full use of by category sludge gas burning or pure electrically driven (operated) heat pump by low-grade steam come heat supply
The cheap energy.
In a further embodiment, the first vacuum degree and the second vacuum degree are respectively 40-50mbar and 110-
120mbar.Different vacuum degrees, which is arranged, can make the reduction of the boiling point of the first evaporator and the solution in the second evaporator, save energy
Source, while potential corrosion harmfulness and scaling tendency are reduced, so that equipment is without carrying out except hard pretreatment and later maintenance.
It in a further embodiment, further include that the second heat exchanger and the first evaporator carry out heat exchange, for the first evaporation
Tank provides evaporation institute's calorific requirement.Therefore the first evaporator does not need to be additionally provided heat source, recycles the heat in the second heat exchanger
Amount, with energy saving, reduction equipment cost and energy cost.
The invention discloses a kind of processing units for landfill leachate, use two-stage high vacuum decompression low temperature and steam
Hair, heat source can be burnt by category sludge gas or pure electrically driven (operated) heat pump, can also by low-grade steam come heat supply, with
The hot water for generating about 80-90 DEG C, makes full use of the cheap energy.And heat source input is directly first to evaporate in the second evaporator
Condensed product, since condensed product is less scaling, there is no need to worry maintenance issues.The steam evaporated in second evaporator passes through
Second heat exchanger of peripheral hardware heats the percolate in the first evaporator, the steam in the first evaporator pass through again First Heat Exchanger into
One step, which exchanges heat to obtain condensed product, enters neutralizing tank to recycle heat, reduces unnecessary heat source cost.First Heat Exchanger
Belong to tubular heat exchanger or plate heat exchanger with the second heat exchanger, it is convenient for safeguarding.PH is adjusted after the steam condensation that evaporation generates
It is worth and is concentrated, the useful products of high concentration can be obtained to be recycled, the steam condensate (SC) of evaporation can satisfy
Discharge standard direct emission.Evaporating temperature is low, therefore fouling tendency reduces, and without pretreatment, and equipment corrosion tendency reduces, can
To reduce equipment investment, extend service life of equipment using the material of lower grade.The main moving component of the present apparatus is
Water pump and vacuum pump, vacuum pump are to form vacuum by condensate water pot, do not extract the steam in evaporator, the movement of equipment directly
Component is less, reduces maintenance maintenance cost.
Detailed description of the invention
Including attached drawing to provide a further understanding of embodiments and attached drawing is incorporated into this specification and is constituted this
Part of specification.Drawing illustration embodiment and together with the description principle for explaining the present invention.It will readily recognize that
To many expected advantages of other embodiments and embodiment, because described in detail below by quoting, they become by preferably
Understand.The element of attached drawing is not necessarily mutually proportionally.Same appended drawing reference refers to corresponding like.
Fig. 1 is the equipment flowsheet of the processing unit for landfill leachate of the embodiment of the present invention；
Fig. 2 is the flow chart of the processing method for landfill leachate of the embodiment of the present invention.
Description of symbols: pretreatment system 1, the first evaporator 2, the second evaporator 3, First Heat Exchanger 4, second exchange heat
Device 5, neutralizing tank 6, condensate water pot 7, the first storage tank 8, the second storage tank 9, heat source 10, third heat exchanger 11, cooling tower 12,
One circulating pump 13, the first vacuum pump 14, the second vacuum pump 15, acid pump or alkali pump 16, second circulation pump 17, sour tank or alkali tank 18.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
Below in conjunction with attached drawing 1, the present invention will be described in detail, and the invention proposes a kind of for landfill leachate
Processing unit, including pretreatment system 1, the first evaporator 2, the second evaporator 3, First Heat Exchanger 4, the second heat exchanger 5, neutralization
Tank 6, condensate water pot 7.Pretreatment system 1 is exported including pretreatment system 1.First evaporator 2 is equipped with the first evaporator import, the
One evaporator steam (vapor) outlet, the first evaporator concentrated solution outlet.Second evaporator 3 is equipped with the second evaporator import, the second evaporation
Tank steam (vapor) outlet, the second evaporator concentrated solution outlet.First Heat Exchanger 4 is equipped with First Heat Exchanger import and First Heat Exchanger goes out
Mouthful.Second heat exchanger 5 is equipped with the second heat exchanger import and the second heat exchanger exit.Neutralizing tank 6 is equipped with neutralizing tank import and neutralization
Tank outlet.Wherein pretreatment system outlet is connected with the first evaporator import, the first evaporator steam (vapor) outlet and First Heat Exchanger
Import is connected, and First Heat Exchanger outlet is connected with neutralizing tank import, and neutralizing tank outlet is connected with the second evaporator import, and second steams
Hair tank steam (vapor) outlet is connected with the second heat exchanger import, and the second heat exchanger exit is connected with condensate water pot 7,
Second heat exchanger 5 is arranged near the first evaporator 2.
In a preferred embodiment, landfill leachate stoste or rubbish be can be in pretreatment system 1 and the first evaporator 2
Percolate is also possible to other solution containing a large amount of ammonia through RO/NF treated concentrate.When pretreatment system 1 and
When solution in one evaporator 2 is landfill leachate through RO/NF treated concentrate, the vacuum degree of the first evaporator 2 is 40-
50mbar, about 45-50 DEG C of evaporating temperature, the steam generated passes through the after 2 top foam removal de-bubble of the first evaporator output
The condensation of one heat exchanger 4 forms the condensed water containing ammonia nitrogen, and about 95% or more ammonia nitrogen can be all brought into steam.RO/NF concentration
Liquid will be concentrated to 30-40% or more solid content by circulating and evaporating, and periodically be carried out by the equipment bottom valve of the first evaporator 2
Discharge.It is ammonium sulfate solution in second evaporator 3, the vacuum degree of the second evaporator 3 is 110-120mbar, and evaporating temperature is about
60-65 DEG C, simultaneously outlet is stored circulating and evaporating to certain density sulfate liquor, and the steam for evaporating formation is introduced into second
Heat exchanger 5 exchanges heat with RO/NF concentrate.Different vacuum degrees is arranged in the first evaporator 2 and the second evaporator 3 can be with
Make the reduction of the boiling point of the first evaporator 2 and the solution in the second evaporator 3, it is energy saving, while reducing potential corrosion harmfulness
And scaling tendency, so that equipment is without carrying out except hard pretreatment and later maintenance.When pretreatment system 1 and the first evaporator 2
In solution when being other solution, the vacuum degree and evaporating temperature of the first evaporator 2 and the second evaporator 3 can choose other conjunctions
Suitable numerical value.
Acid or alkali are added in neutralizing tank 6 to adjust the pH value for obtaining product.In a preferred embodiment, the first evaporator
Landfill leachate stoste or landfill leachate in 2 obtain after condensing after RO/NF treated concentrate evaporation containing the cold of ammonia
Lime set adds suitable sulphur acid for adjusting pH value in neutralizing tank 6 to obtain ammonium sulfate, and ammonium sulfate is further second
Be concentrated by evaporation in evaporator 3 and recycled with the ammonium sulfate after be concentrated, the steam evaporated in the second evaporator 3 for without
The condensed water of ammonia, meeting discharge standard can be used with direct emission or further progress heat exchange cycle.
It further include the first storage tank 8, the second storage tank 9, heat source 10, third heat exchanger 11, cooling tower 12, first circulation pump
13, the first vacuum pump 14, the second vacuum pump 15, acid pump or alkali pump 16.First storage tank 8 include the first storage tank import, second
Storage tank 9 includes the second storage tank import, and the first evaporator concentrated solution outlet is connected with the first storage tank import, the second evaporator
Concentrated solution outlet is connected with the second storage tank import.Final concentrate can further circulating and evaporating in first storage tank 8
Concentration is rationally handled, and the product in the second storage tank 9 can further evaporate recycling or meet discharge standard
Direct emission.In a preferred embodiment, concentrate final in the first storage tank 8 is the RO/NF concentrate being concentrated again, second
Product in storage tank 9 is the ammonium sulfate after concentration.
Third heat exchanger 11 is arranged in the second evaporator 3 and is connected with heat source 10, and heat source 10 includes hot water or heat pump.?
In preferred embodiment, about 80-90 DEG C of the temperature of heat source 10, by category sludge gas burning or pure electrically driven (operated) heat pump,
It can be by low-grade steam come heat supply.Second heat exchanger 5 carries out heat exchange with the first evaporator 2 to mention for the first evaporator 2
For evaporating institute's calorific requirement.Therefore the first evaporator 2 does not need to be additionally provided heat source, recycles steam in the second heat exchanger 5
Heat is with energy saving, reduction equipment cost and energy cost.
Condensate water pot 7 is equipped with condensate water pot import and condensate water pot exports, and condensate water pot outlet is connected with cooling tower.Condensation
Condensed water is supplied cooling tower 12 by water pot 7, second circulation pump 17 is provided between cooling tower 12 and First Heat Exchanger 4, second follows
Condensed water within ring pump 17 is used inside circulating cooling tower 12, condensed water is further transmitted and is changed with First Heat Exchanger 4
Heat condenses the steam in First Heat Exchanger 4.Therefore cooling tower 12 is arranged near First Heat Exchanger 4.Preferred real
Apply in example, cooling tower 12 is arranged on the back side of First Heat Exchanger 4 so that the condensed water of cooling tower 12 and First Heat Exchanger 4 into
Row heat exchange condenses the steam in First Heat Exchanger 4, energy saving to achieve the effect that.
First circulation pump 13 is arranged between the second heat exchanger 5 and the first evaporator 2, is used for the first evaporator 2 of interior circulation
Interior liquid simultaneously enters the heat exchange of the second heat exchanger 5, so that the first evaporator 2 obtains evaporation institute's calorific requirement, the first vacuum pump 14 is set
It sets on neutralizing tank 6, forms vacuum in neutralizing tank 6 and the first evaporator 2 to make, the second vacuum pump 15 is arranged in condensate water pot
On 7, vacuum is formed in condensate water pot 7 and the second evaporator 3 to make.First vacuum pump 14 and the second vacuum pump 15 are by cold
Solidifying product forms vacuum, does not extract the steam of evaporator directly, the moving component of equipment is less, reduces maintenance maintenance cost.
Acid pump or alkali pump 16 are installed on 6 top of neutralizing tank, and configured with sour tank or alkali tank 18, to control the additional amount of acid or alkali.
In a preferred embodiment, First Heat Exchanger 4 and the second heat exchanger 5 include tubular heat exchanger or plate heat exchanger,
Tubular heat exchanger or plate heat exchanger it is relatively simple for structure, compact, convenient for safeguarding.Third heat exchanger 11 includes coil heat exchange
Device, coil heat exchanger is energy-efficient, good effect of heat exchange.
The invention also discloses a kind of processing methods for landfill leachate, as shown in Fig. 2, including the following steps:
S1: percolate is introduced, and there is the first evaporator 2 of the first vacuum degree to be evaporated, and the steam of generation is introduced the
One heat exchanger 4 is condensed to obtain the first condensed water；
S2: the pH value of the first condensed water is adjusted, and the first condensed water is introduced to second evaporator 3 with the second vacuum degree
In, to be evaporated processing to the first condensed water；
S3: the steam generated in the second evaporator 3 and the second heat exchanger 5 is made to carry out heat exchange to obtain the second condensed water.
In a preferred embodiment, step S3 further includes collecting the second condensed water and making the second condensed water and First Heat Exchanger
4 carry out heat exchange.Condense the steam in First Heat Exchanger 4 energy saving to achieve the effect that.
In a preferred embodiment, step S3 further includes providing heat source 10 for the second evaporator 3.Heat source 10 include hot water or
Heat pump, can be by category sludge gas burning or pure electrically driven (operated) heat pump, can also be by low-grade steam come heat supply, sufficiently benefit
With the cheap energy.
In a preferred embodiment, when the solution in the first evaporator 2 is landfill leachate through RO/NF treated concentration
When liquid, the first vacuum degree and the second vacuum degree are respectively 40-50mbar and 110-120mbar, respectively by 14 He of the first vacuum pump
Second vacuum pump 15 provides.Different vacuum degrees, which is arranged, can make the boiling point of the first evaporator 2 and the solution in the second evaporator 3
Reduce, it is energy saving, while reducing potential corrosion harmfulness and scaling tendency so that equipment without carrying out except hard pretreatment and
Later maintenance.When the solution in the first evaporator 2 is other solution, the vacuum degree of the first evaporator 2 and the second evaporator 3 and
Evaporating temperature can choose other suitable numerical value.
The invention discloses a kind of processing units for landfill leachate, use two-stage high vacuum decompression low temperature and steam
Hair, heat source 10 can be burnt by category sludge gas or pure electrically driven (operated) heat pump, can also by low-grade steam come heat supply,
To generate about 80-90 DEG C of hot water, the cheap energy is made full use of.And the input of heat source 10 is directly first to evaporate the second evaporator
Condensed product in 3, since condensed product is less scaling, there is no need to worry maintenance issues.The steaming evaporated in second evaporator 3
Vapour heats the percolate in the first evaporator 2 by the second heat exchanger 5 of peripheral hardware, and the steam in the first evaporator 2 passes through the again
Further heat exchange obtains condensed product and enters neutralizing tank 6 to recycle heat one heat exchanger 4, reduce unnecessary heat source at
This.First Heat Exchanger 4 and the second heat exchanger 5 belong to tubular heat exchanger or plate heat exchanger, convenient for safeguarding.Evaporating temperature is low, because
This fouling tendency reduces, and without pretreatment, and equipment corrosion tendency reduces, and extends service life of equipment.The present apparatus is main
Moving component is circulating pump and vacuum pump, does not extract the steam in evaporator directly, the moving component of equipment is less, reduces dimension
Repair maintenance cost.Also proposed a kind of processing method for landfill leachate simultaneously, this method process is simple, and it is practical,
The principle for meeting environmental protection and energy saving and efficiently utilizing is conducive to promote the use of.
Although the principle of the present invention is described in detail above in conjunction with the preferred embodiment of the present invention, this field skill
Art personnel are it should be understood that above-described embodiment is only the explanation to exemplary implementation of the invention, not to present invention packet
Restriction containing range.Details in embodiment is simultaneously not meant to limit the scope of the invention, without departing substantially from spirit of the invention and
In the case where range, any equivalent transformation based on technical solution of the present invention, simple replacement etc. obviously change, and all fall within
Within the scope of the present invention.
Claims (15)
1. a kind of processing unit for landfill leachate, including pretreatment system, the first evaporator, the second evaporator, first
Heat exchanger, the second heat exchanger, neutralizing tank, condensate water pot, which is characterized in that
The pretreatment system includes pretreatment system outlet；
First evaporator is equipped with the first evaporator import, the first evaporator steam (vapor) outlet, the first evaporator concentrated solution outlet；
Second evaporator is equipped with the second evaporator import, the second evaporator steam (vapor) outlet, the second evaporator concentrated solution outlet；
The First Heat Exchanger is equipped with First Heat Exchanger import and First Heat Exchanger exports；
Second heat exchanger is equipped with the second heat exchanger import and the second heat exchanger exit；
The neutralizing tank is equipped with neutralizing tank import and neutralizing tank exports；Wherein
The pretreatment system outlet is connected with the first evaporator import, and the first evaporator steam (vapor) outlet is changed with described first
Hot device import is connected, and the First Heat Exchanger outlet is connected with the neutralizing tank import, the neutralizing tank outlet and described second
Evaporator import is connected, and the second evaporator steam (vapor) outlet is connected with the second heat exchanger import, second heat exchanger
Outlet is connected with the condensate water pot, and second heat exchanger is arranged near first evaporator.
2. the processing unit according to claim 1 for landfill leachate, which is characterized in that first evaporator
Vacuum degree is 40-50mbar, and the vacuum degree of second evaporator is 110-120mbar.
3. the processing unit according to claim 1 for landfill leachate, which is characterized in that add in the neutralizing tank
Acid adding or alkali are to adjust the pH value for obtaining product.
4. the processing unit according to claim 1 for landfill leachate, which is characterized in that further include the first storage
Tank, the second storage tank, first storage tank include the first storage tank import, second storage tank include the second storage tank into
Mouthful, the first evaporator concentrated solution outlet is connected with the first storage tank import, the second evaporator concentrated solution outlet
It is connected with the second storage tank import.
5. the processing unit according to claim 1 for landfill leachate, which is characterized in that further include heat source and third
Heat exchanger, the third heat exchanger are arranged in second evaporator and are connected with the heat source, and the heat source includes hot water
Or heat pump.
6. the processing unit according to claim 1 for landfill leachate, which is characterized in that second heat exchanger with
First evaporator carries out heat exchange to provide evaporation institute's calorific requirement for first evaporator.
7. the processing unit according to claim 5 for landfill leachate, which is characterized in that the First Heat Exchanger and
Second heat exchanger includes tubular heat exchanger or plate heat exchanger, and the third heat exchanger includes coil heat exchanger.
8. the processing unit according to claim 1 for landfill leachate, which is characterized in that it further include cooling tower, institute
It states condensate water pot to export equipped with condensate water pot import and condensate water pot, the condensate water pot outlet is connected with cooling tower.
9. the processing unit according to claim 8 for landfill leachate, which is characterized in that the cooling tower is set
Near the First Heat Exchanger.
10. the processing unit according to claim 1 for landfill leachate, which is characterized in that further include first circulation
Pump, the first vacuum pump, the second vacuum pump, the setting of first circulation pump second heat exchanger and first evaporator it
Between, for the liquid in the first evaporator of interior circulation and enter the heat exchange of the second heat exchanger, first vacuum pump is arranged described
On neutralizing tank, vacuum is formed in the neutralizing tank and first evaporator to make, second vacuum pump is arranged described
On condensate water pot, vacuum is formed in the condensate water pot and second evaporator to make.
11. a kind of processing method for landfill leachate, which comprises the steps of:
S1: percolate is introduced, and there is the first evaporator of the first vacuum degree to be evaporated, and the steam of generation is introduced first and is changed
Hot device is condensed to obtain the first condensed water；
S2: the pH value of the first condensed water is adjusted, and first condensed water is introduced to second evaporator with the second vacuum degree
In, to be evaporated processing to first condensed water；
S3: the steam generated in the second evaporator and the second heat exchanger is made to carry out heat exchange to obtain the second condensed water.
12. the processing method according to claim 11 for landfill leachate, which is characterized in that step S3 further includes receiving
Collect second condensed water and second condensed water and the First Heat Exchanger is made to carry out heat exchange.
13. the processing method according to claim 11 for landfill leachate, which is characterized in that step S3 further include for
The second evaporator heating provides heat source.
14. the processing method according to claim 11 for landfill leachate, which is characterized in that first vacuum degree
It is respectively 40-50mbar and 110-120mbar with second vacuum degree.
15. the processing method according to claim 11 for landfill leachate, which is characterized in that further include described second
Heat exchanger and the first evaporator carry out heat exchange, provide evaporation institute's calorific requirement for first evaporator.
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| CN102838244A (en) * | 2012-08-16 | 2012-12-26 | 广州新普利节能环保科技有限公司 | Landfill leachate treatment process and device |
| KR101421386B1 (en) * | 2013-12-26 | 2014-07-18 | 현대건설주식회사 | Seawater Desalination System |
| CN104368166A (en) * | 2014-10-28 | 2015-02-25 | 南通京通石墨设备有限公司 | Two-effect titanium liquid concentration device and concentration process |
| CN105967255A (en) * | 2016-05-23 | 2016-09-28 | 江苏瑞升华能源科技有限公司 | Landfill leachate treatment system and technology |
| CN108751302A (en) * | 2018-07-20 | 2018-11-06 | 昆山元魁机电工程有限公司 | A kind of vacuum and low temperature evaporating separation device and sewage water treatment method |
| CN209618920U (en) * | 2018-12-25 | 2019-11-12 | 厦门嘉戎技术股份有限公司 | A kind of processing unit for landfill leachate |
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2018
- 2018-12-25 CN CN201811592284.2A patent/CN109574113B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102838244A (en) * | 2012-08-16 | 2012-12-26 | 广州新普利节能环保科技有限公司 | Landfill leachate treatment process and device |
| KR101421386B1 (en) * | 2013-12-26 | 2014-07-18 | 현대건설주식회사 | Seawater Desalination System |
| CN104368166A (en) * | 2014-10-28 | 2015-02-25 | 南通京通石墨设备有限公司 | Two-effect titanium liquid concentration device and concentration process |
| CN105967255A (en) * | 2016-05-23 | 2016-09-28 | 江苏瑞升华能源科技有限公司 | Landfill leachate treatment system and technology |
| CN108751302A (en) * | 2018-07-20 | 2018-11-06 | 昆山元魁机电工程有限公司 | A kind of vacuum and low temperature evaporating separation device and sewage water treatment method |
| CN209618920U (en) * | 2018-12-25 | 2019-11-12 | 厦门嘉戎技术股份有限公司 | A kind of processing unit for landfill leachate |
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