CN109761428A - Landfill leachate full dose treatment process - Google Patents
Landfill leachate full dose treatment process Download PDFInfo
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- CN109761428A CN109761428A CN201910166431.8A CN201910166431A CN109761428A CN 109761428 A CN109761428 A CN 109761428A CN 201910166431 A CN201910166431 A CN 201910166431A CN 109761428 A CN109761428 A CN 109761428A
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Abstract
The embodiment of the invention provides a kind of landfill leachate full dose treatment process, comprising the following steps: pretreatment；Film infiltration processing, pretreated landfill leachate carry out film infiltration processing, the first clear liquid of the concentrate retained and infiltration by reverse osmosis membrane under the first preset pressure；Softening is except hard processing, and into concentrate, addition removes hard agent, to reduce the hardness of concentrate；Double base catalytic wet oxidation processing, through carrying out open loop chain rupture to the organic matter in concentrate under the second preset pressure and the first preset temperature except the concentrate handled firmly；Evaporation process is evaporated processing to the concentrate handled through double base catalytic wet oxidation, obtains crystal salt and the second clear liquid；Subsequent processing.It is handled by double base catalytic wet oxidation, avoids organic matter and water in evaporation process and generate azeotropic effect, improve the treatment effeciency of kettle residual degree of drying and the concentrate to landfill leachate.
Description
Technical field
The present invention relates to environment-friendly engineering technical field more particularly to a kind of landfill leachate full dose treatment process.
Background technique
In garbage disposal, landfill time longer Landfill Leachate generally has that hardness is high, salt content is high, again
Tenor is high, organic pollutant concentration is high, ammonia nitrogen/total nitrogen content is high, the characteristics such as biodegradability difference, using single materialization or
Biochemical process is unable to reach the needs of discharge standard.
Therefore, the primary abatement mode of current landfill leachate is that the mode of " materialization+biochemistry+film filtering " is handled,
There are mainly two types of processing modes for the concentrate that film filtering generates for this kind of processing mode, wherein the first processing mode be by
The direct recharge of film concentrate is to landfill yard, and still, which will cause the enrichment of pollutant and salinity, so as to cause original biochemistry
The decline of system treatment effeciency, influences whole system processing capacity and treating capacity；Second of processing mode is to carry out film concentrate
Evaporation, but this kind of processing mode be due to containing the organic matters such as a large amount of humic acid, humus in film concentrate, in evaporation process
In, these organic matters can with water generate azeotropic effect, formed viscous gum, cause evaporator can not normal table operation, together
When the kettle that cannot dry it is residual, influence treatment effect.Also, the hardness in film concentrate is very high, will lead to evaporation equipment fouling
Seriously, cleaning systems are difficult, it is difficult to longtime running.
Therefore it provides one kind, in evaporation process, with water azeotropic will not occur for organic matter, dry kettle can be conveniently obtained
Garbage leachate treatment process that is residual, reducing evaporation equipment fouling becomes urgent problem to be solved.
Summary of the invention
The present invention provides a kind of landfill leachate full dose treatment process, has solved conventional garbage percolate treating process pair
When film concentrate is evaporated processing, organic matter and water generate azeotropic effect, form viscous gum, cause evaporator can not be just
Normal stable operation, while the kettle that cannot be dried is residual, influences treatment effect, also, the hardness in film concentrate is very high, will lead to
Evaporation equipment fouling is serious, and cleaning systems are difficult, it is difficult to the problem of longtime running.
To achieve the above object, the present invention provides a kind of landfill leachate full dose treatment process, the treatment process packet
Include following steps:
Pretreatment adjusts the physico-chemical property of landfill leachate and removes the suspended matter in the landfill leachate and bulky grain pollution
Object；
Film infiltration processing, pretreated landfill leachate are carried out at film infiltration under the first preset pressure by reverse osmosis membrane
Reason, the first clear liquid of the concentrate retained and infiltration；
Softening is handled except hard, and addition removes hard agent in Xiang Suoshu concentrate, to reduce the hardness of the concentrate；Wherein, except hard heavy
Starch is the first sludge；
The processing of double base catalytic wet oxidation is removed the concentrate handled firmly under the second preset pressure and the first preset temperature to institute
The organic matter stated in concentrate carries out open loop chain rupture；
Evaporation process is evaporated processing to the concentrate handled through double base catalytic wet oxidation, obtains crystal salt and second clearly
Liquid；
Subsequent processing carries out subsequent processing to first clear liquid and second clear liquid and obtains qualified discharge liquid.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
Pretreatment, adjusts the physico-chemical property of landfill leachate and removes the suspended matter in the landfill leachate and bulky grain pollutant,
Include:
The physico-chemical property of the landfill leachate is adjusted in conditioning tank；
Landfill leachate through adjusting physico-chemical property is subjected to sand filtration processing, obtains the second sludge and the first percolate；
First percolate is filtered through bag filter.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
Pretreatment, the film infiltration processing, pretreated landfill leachate carry out film by reverse osmosis membrane under the first preset pressure
Infiltration processing, the first clear liquid of the concentrate retained and infiltration, comprising:
The pretreated landfill leachate is carried out at film infiltration under the first preset pressure by least one level reverse osmosis membrane
Reason.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
Pretreatment, subsequent processing carry out subsequent processing to first clear liquid and second clear liquid and obtain qualified discharge liquid, comprising:
First clear liquid and second clear liquid are subjected to reverse osmosis treatment by coiled reverse osmosis membrane, obtain the row up to standard
Tapping and concentrating return-flow liquid.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
First clear liquid and second clear liquid are carried out reverse osmosis treatment by coiled reverse osmosis membrane described, later by pretreatment
Further include:
Advanced treating removes ammonia nitrogen and total nitrogen content using resin adsorption, obtains the qualified discharge liquid.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
First clear liquid and second clear liquid are carried out reverse osmosis treatment by coiled reverse osmosis membrane, obtain described reach by pretreatment
Relief liquor and concentrating return-flow liquid are marked, later further include:
The concentrating return-flow liquid is flowed back, and is handled through the film infiltration.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
Pretreatment, the treatment process further include:
Sludge dewatering carries out thickening to first sludge and second sludge；Obtain mud cake and filters pressing phegma；
To the mud cake landfill disposal.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
Pretreatment, sludge dewatering carry out thickening to first sludge and second sludge；Obtain mud cake and filters pressing reflux
Liquid, later further include:
The filters pressing phegma is flowed back, and is handled through the sand filtration.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
Pretreatment, the treatment process further include:
Salt treatment is crystallized, according to crystal salt described in hazardous chemical waste disposal.
As a kind of optional embodiment of the invention, described in landfill leachate full dose treatment process provided by the invention
Pretreatment, it is described except hard agent includes quick lime, sodium hydroxide, sodium carbonate, aluminium polychloride, at least one in polyacrylamide
Kind.
A kind of landfill leachate full dose treatment process provided in an embodiment of the present invention, the treatment process include following step
Rapid: pretreatment adjusts the physico-chemical property of landfill leachate and removes the suspended matter in landfill leachate and bulky grain pollutant；Film
Infiltration processing, pretreated landfill leachate carry out film infiltration processing by reverse osmosis membrane under the first preset pressure, obtain
The concentrate of retention and the first clear liquid of infiltration；Softening is except hard processing, and into concentrate, addition removes hard agent, to reduce concentrate
Hardness；Wherein, except hard sediment is the first sludge；Double base catalytic wet oxidation processing, through except the concentrate handled firmly is second
Open loop chain rupture is carried out to the organic matter in concentrate under preset pressure and the first preset temperature；Evaporation process, to through double base wet type
The concentrate of catalytic oxidation treatment is evaporated processing, obtains crystal salt and the second clear liquid；Subsequent processing, to the first clear liquid and
Two clear liquids carry out subsequent processing and obtain qualified discharge liquid.In this way, being avoided except hard processing to landfill leachate by softening
When concentrate is evaporated processing, the excessive high hardness of percolate, the case where leading to evaporation equipment fouling generation reduces system
Cleaning difficulty ensure that the longtime running of system；Also, it is handled by double base catalytic wet oxidation, by the dense of landfill leachate
The organic matters such as the humic acid, the humus that contain in contracting liquid carry out open loop chain rupture processing, and larger molecular organics are degraded to small molecule
Group avoids organic matter and water in evaporation process and generates azeotropic effect, forms viscous gum, cause evaporator normal
The case where stable operation, occurs, and improves the treatment effeciency of kettle residual degree of drying and the concentrate to landfill leachate.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without any creative labor, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the process flow chart for the landfill leachate full dose treatment process that the embodiment of the present invention one provides；
Fig. 2 is the process flow chart of landfill leachate full dose treatment process provided by Embodiment 2 of the present invention.
Through the above attached drawings, it has been shown that the specific embodiment of the present invention will be hereinafter described in more detail.These attached drawings
It is not intended to limit the scope of the inventive concept in any manner with verbal description, but is by referring to specific embodiments
Those skilled in the art illustrate the concept of the disclosure.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should broadly understood, for example, can make to be fixedly connected, be also possible to indirectly connected through an intermediary, can be with
It is the interaction relationship of the connection or two elements inside two elements.For the ordinary skill in the art,
The specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of the present invention, the meaning of " plurality " is two or more, accurately specifically advise unless otherwise
It is fixed.
In addition, term " includes " and " having " and their any deformation, it is intended that covering non-exclusive includes example
Such as, the process, method, system, product or equipment for containing a series of steps or units those of are not necessarily limited to be clearly listed
Step or unit, but may include being not clearly listed or intrinsic for these process, methods, product or equipment other
Step or unit.
Embodiment one
Fig. 1 is the process flow chart for the landfill leachate full dose treatment process that the embodiment of the present invention one provides.
Shown in referring to Fig.1, the embodiment of the present invention one provides a kind of landfill leachate full dose treatment process, the processing work
Skill the following steps are included:
Step 101, it pre-processes, adjusts the physico-chemical property of landfill leachate and remove the suspended matter in landfill leachate and bulky grain
Pollutant.
Specifically, the physico-chemical property of landfill leachate can be adjusted in preprocessing process, such as garbage filter
The pH value of liquid, temperature physico-chemical property；Specifically, can be removed in landfill leachate by way of filtering in present embodiment
Suspended matter and the impurity such as bulky grain pollutant, water quality requirement when guaranteeing that landfill leachate enters next step processing.
Step 102, film infiltration handle, pretreated landfill leachate under the first preset pressure by reverse osmosis membrane into
Row film infiltration processing, the first clear liquid of the concentrate retained and infiltration.
Specifically, film infiltration processing can be using extraordinary reverse osmosis membrane (SUPER RO) first in present embodiment
Film infiltration processing is carried out to landfill leachate under preset pressure, wherein the first preset pressure can be in 20bar ~ 180bar；?
After carrying out high power concentration to landfill leachate under the conditions of first preset pressure, most of pollutant in landfill leachate is separated
Out, 90% or more COD and salinity are trapped within concentrated water side in landfill leachate, to obtain the concentration for being trapped within concentrated water side
Liquid and by extraordinary reverse osmosis membrane infiltration treated the first clear liquid.
Step 103, softening is except hard processing, and into concentrate, addition removes hard agent, to reduce the hardness of concentrate；Wherein, it removes
Hard sediment is the first sludge.
Specifically, for reduce during being evaporated to concentrate because in concentrate excessive high hardness lead to equipment knot
Dirt influences treatment effect.In present embodiment, into concentrate, addition removes hard agent, to reduce the hardness of concentrate.
Specifically, in present embodiment, except hard agent includes quick lime, sodium hydroxide, sodium carbonate, aluminium polychloride, poly- third
At least one of acrylamide.Optionally, except hard agent also may include above-mentioned except a variety of mixed in hard agent in present embodiment
Close object.
In present embodiment, by being added into concentrate except hard agent, calcium, magnesium plasma in concentrate can with remove hard agent
In anion formed precipitating, to reduce the hardness of concentrate；Also, in present embodiment, by being added in concentrate
Except hard agent can reach the COD removal rate in concentrate except hard agent can play brokenly glue processing to the part colloid in concentrate
To 20% or more.
Optionally, in present embodiment, step 103, softening is also possible to permeate processing in step 102 film except hard processing
Preceding progress.Specific choice carries out sofening treatment to concentrate after film infiltration processing in present embodiment, can be effectively reduced
Acid-base modifier and dosage except hard agent.
Step 104, double base catalytic wet oxidation is handled, and it is pre- in the second preset pressure and first to be removed the concentrate handled firmly
If open loop chain rupture is carried out to the organic matter in concentrate at a temperature of.
In present embodiment, due to containing a large amount of organic matter, salinity, heavy metal etc. in concentrate, to mitigate complicated water
The adverse effect of confrontation vapo(u)rization system, before entering vapo(u)rization system, by double base catalytic wet oxidation processing system to concentration
Liquid carries out materializing strategy.Specifically, it is wet that double base catalytic wet oxidation processing system can be Bi-CWO double base in present embodiment
Formula catalytic oxidation treatment system；Bi-CWO system has effective catalyst, using nano-sized carbon as stablizing skeleton, while loading ruthenium system
The recyclable circulation catalysis compensation system of solid phase filling catalytic bed system and homogeneous ionic liquid that composite oxides are characterized, in high temperature
Under the conditions of certain pressure, open loop chain rupture can be carried out to organic substance most in concentrate, organic matter, which is realized, to be decomposed, most
Eventually with H2O、CO2, sulfate, the forms such as nitrate exist, to the removal of organic matter up to 70% or more.Optionally, this embodiment party
The first preset temperature can be 240 DEG C ~ 260 DEG C in formula, and the second preset pressure can be 5 ~ 7Mpa.
Step 105, evaporation process is evaporated processing to the concentrate handled through double base catalytic wet oxidation, is tied
Brilliant salt and the second clear liquid.
Specifically, can be steamed using MVR mechanical steam recompression in present embodiment when being evaporated to concentrate
Hair device is evaporated, and can also be evaporated using multi-effect evaporator (Multiple Effect Distillation, MED).
Certainly, concentrate can also be evaporated using other evaporators in present embodiment, this is not done in present embodiment and is had
Body limits.By evaporating and condensing, the salt in concentrate is subjected to crystallization removal, condensate liquid is the second clear liquid, realizes rubbish
The full quantification treatment of rubbish percolate.
Step 106, subsequent processing carries out subsequent processing to the first clear liquid and the second clear liquid and obtains qualified discharge liquid.
Specifically, subsequent processing, which can be, examines the mixed liquor of the first clear liquid and the second clear liquid in present embodiment
Survey, handled according to testing result, if testing result reaches water quality discharge standard, can direct emission, if in testing result
The pollutants such as ammonia nitrogen, total nitrogen content it is not up to standard, then ammonia nitrogen and total nitrogen in mixed liquor can be further removed, until reaching row
Put standard.
The landfill leachate full dose treatment process that the embodiment of the present invention one provides, comprising the following steps: pretreatment is adjusted
The physico-chemical property of landfill leachate simultaneously removes the suspended matter in landfill leachate and bulky grain pollutant；Film infiltration processing, through pre-
The landfill leachate of processing under the first preset pressure by reverse osmosis membrane carry out film infiltration processing, the concentrate retained and
First clear liquid of infiltration；Softening is except hard processing, and into concentrate, addition removes hard agent, to reduce the hardness of concentrate；Wherein, except hard
Sediment is the first sludge；Double base catalytic wet oxidation processing, through except the concentrate handled firmly is in the second preset pressure and first
Open loop chain rupture is carried out to the organic matter in concentrate under preset temperature；Evaporation process, to what is handled through double base catalytic wet oxidation
Concentrate is evaporated processing, obtains crystal salt and the second clear liquid；Subsequent processing carries out the first clear liquid and the second clear liquid subsequent
Processing obtains qualified discharge liquid.In this way, avoiding and being evaporated in the concentrate to landfill leachate except hard processing by softening
When processing, the excessive high hardness of percolate, the case where leading to evaporation equipment fouling generation reduces the cleaning difficulty of system, guarantees
The longtime running of system；Also, it is handled by double base catalytic wet oxidation, the corruption that will contain in the concentrate of landfill leachate
It grows the organic matters such as acid, humus and carries out open loop chain rupture processing, larger molecular organics are degraded to subset, avoid and evaporating
Organic matter and water generate azeotropic effect in the process, form viscous gum, cause evaporator can not normal table operation the case where
Occur, improves the treatment effeciency of kettle residual degree of drying and the concentrate to landfill leachate.
Embodiment two
Fig. 2 is the process flow chart of landfill leachate full dose treatment process provided by Embodiment 2 of the present invention.
Based on previous embodiment one, referring to shown in Fig. 2, the full quantification treatment of landfill leachate provided by Embodiment 2 of the present invention
Technique, wherein step 101, pretreatment, adjust the physico-chemical property of landfill leachate and remove the suspended matter in landfill leachate and
Bulky grain pollutant, comprising:
The physico-chemical property of landfill leachate is adjusted in conditioning tank.
Specifically, conditioning tank can be the collecting pit for collecting landfill leachate in present embodiment, by garbage filter
Liquid collection carries out that physico-chemical property is concentrated to adjust in conditioning tank.Specifically, in present embodiment, it can be by adding into conditioning tank
Add acid-base modifier etc. that the pH value of landfill leachate is adjusted, to guarantee to enter extraordinary reverse osmosis membrane in landfill leachate
The pH value requirement of water quality can be reached when middle.
Landfill leachate through adjusting physico-chemical property is subjected to sand filtration processing, obtains the second sludge and the first percolate.
Specifically, to avoid large granular impurity in landfill leachate and pollutant from making the water quality requirement in film process stage
At influence, in present embodiment, the landfill leachate after physico-chemical property is adjusted can first pass through sand filtration and be handled, specifically
, sand filtration processing can be the packed tower that landfill leachate is passed through to quartz sand, and quartz sand filler tower can filter out rubbish infiltration
Suspended matter, bulky grain pollutant in filtrate, and the part colloidal substance in landfill leachate can also be adsorbed, to guarantee
Into the water quality of the landfill leachate of film infiltration processing stage, the service life and film infiltration processing of extraordinary reverse osmosis membrane are improved
Treatment effeciency.By sand filtration, treated that filter residue is the second sludge, and filtrate is the first percolate.
First percolate is filtered through bag filter.
Optionally, referring to shown in Fig. 2, landfill leachate full dose treatment process provided in this embodiment, wherein step
102, film infiltration processing, pretreated landfill leachate is carried out at film infiltration under the first preset pressure by reverse osmosis membrane
Reason, the first clear liquid of the concentrate retained and infiltration, comprising:
Pretreated landfill leachate carries out film infiltration processing by least one level reverse osmosis membrane under the first preset pressure.
Specifically, the first preset pressure can be the operating pressure of reverse osmosis membrane in present embodiment, specifically, first
Preset pressure can be set in 20bar ~ 180bar, to carry out high power concentration to landfill leachate.
Specifically, the series of reverse osmosis membrane can be specifically chosen according to water quality, for example, working as rubbish in present embodiment
COD in rubbish percolate is greater than 8000mg/L, total dissolved solidss (Total dissolved solids, TDS), and TDS is 10000
When ~ 100000us/cm, two steps ro film can be selected to carry out film infiltration processing to landfill leachate, i.e. the first order is reverse osmosis
Production water after film process is handled using second level reverse osmosis membrane, so, it is possible to be effectively ensured film infiltration treated
Water index.Optionally, it is less than 5000mg/L in the COD of landfill leachate, TDS is lower than 10000us/cm, level-one can be selected anti-
Permeable membrane carries out film infiltration processing.
It specifically can be according to water quality indicator specifically, being illustrated in present embodiment with the comparison of two Experimental comparison's examples
Series in film infiltration processing is selected.
Comparative example 1
Referring to shown in table 1, table 1 is each workshop section's water quality feelings for selecting first-stage reverse osmosis film to carry out film infiltration processing to landfill leachate
Condition.
Table 1 selects first-stage reverse osmosis film to carry out each workshop section's water quality situation that film infiltration is handled to landfill leachate
As it can be seen from table 1 it is directed to influent quality and discharge standard, it is after carrying out film process using first-stage reverse osmosis film, i.e., reachable
To Chinese effluent standard.
Comparative example 2
Referring to shown in table 2, table 2 is each workshop section's water quality feelings for selecting two-pass reverse osmosis film to carry out film infiltration processing to landfill leachate
Condition.
Table 2 selects two-pass reverse osmosis film to carry out each workshop section's water quality situation that film infiltration is handled to landfill leachate
From table 2 it can be seen that after the producing water water quality after two-pass reverse osmosis film process is relative to first-stage reverse osmosis film process
Producing water water quality significantly improves, and therefore, for the difference of landfill leachate water quality indicator, can reasonably select using first-stage reverse osmosis
Film carries out film infiltration processing or selection two-pass reverse osmosis film carries out film infiltration processing.
Optionally, referring to shown in Fig. 2, in present embodiment, step 106, subsequent processing, to the first clear liquid and the second clear liquid
It carries out subsequent processing and obtains qualified discharge liquid, comprising:
First clear liquid and the second clear liquid are subjected to reverse osmosis treatment by coiled reverse osmosis membrane, qualified discharge liquid is obtained and is concentrated back
Flow liquid.
Specifically, if discharge standard is not achieved in the water quality of the first clear liquid and the second clear liquid, can be incited somebody to action in present embodiment
The mixed liquor of first clear liquid and the second clear liquid carries out reverse osmosis treatment again by coiled reverse osmosis membrane, by coiled reverse osmosis membrane
Processing can remove part ammonia nitrogen, total nitrogen and electrolyte in the first clear liquid and the second clear liquid, improve water quality indicator.Wherein, quilt
The concentrate of coiled reverse osmosis membrane retention is concentrating return-flow liquid.
Optionally, referring to shown in Fig. 2, in present embodiment, the first clear liquid and the second clear liquid is reverse osmosis by rolling
Film carries out reverse osmosis treatment, later further include:
Advanced treating removes ammonia nitrogen and total nitrogen content using resin adsorption, obtains qualified discharge liquid.
Referring to shown in table 2, after resin adsorption, ammonia nitrogen and total nitrogen content in draining are compared at through coiled reverse osmosis membrane
Water quality after reason significantly reduces, and ensure that the qualified discharge of ammonia nitrogen and total nitrogen content in draining.
Optionally, referring to shown in Fig. 2, the first clear liquid and the second clear liquid are subjected to reverse osmosis place by coiled reverse osmosis membrane
Reason, obtains qualified discharge liquid and concentrating return-flow liquid, later further include:
Concentrating return-flow liquid is flowed back, and is handled through film infiltration.
Specifically, in present embodiment, since the mixed liquor of the first clear liquid and the second clear liquid passes through coiled reverse osmosis membrane again
Secondary concentration is percolated, and pollutant load is higher in concentrate, and specifically concentrating return-flow liquid is back at film infiltration in present embodiment
The reason stage carries out film infiltration again and handles, and avoids the enrichment that Concentrated liquid recharge to landfill yard is polluted to object and salinity
It happens.
Optionally, referring to shown in Fig. 2, landfill leachate full dose treatment process provided in this embodiment, further includes following
Step:
Step 107, sludge dewatering carries out thickening to the first sludge and the second sludge；Obtain mud cake and filters pressing phegma.
Specifically, can be and adopt to the mixture progress thickening of the first sludge and the second sludge in present embodiment
It is dehydrated with the mode of filters pressing.It certainly, can also be using other modes to the first sludge and the second sludge in present embodiment
Mixture be dehydrated, for example, by using the mode of centrifugal dehydration.It is not specifically limited in this embodiment in present embodiment.
To mud cake landfill disposal.
In present embodiment, landfill disposal, present embodiment are carried out in a conventional manner to the landfill disposal of mud cake
In repeat no more.
Optionally, in present embodiment, step 107, it is de- to carry out concentration to the first sludge and the second sludge for sludge dewatering
Water；Mud cake and filters pressing phegma are obtained, later further include:
Filters pressing phegma is flowed back, and is handled through sand filtration.
Specifically, contain a large amount of pollutant in filters pressing phegma, it is secondary to avoid filters pressing phegma from causing landfill yard
It pollutes, in present embodiment, filters pressing phegma is back to sand filtration and is handled again, so can be avoided filters pressing phegma pair
The case where landfill yard pollutes.
Optionally, referring to shown in Fig. 2, landfill leachate full dose treatment process provided in this embodiment, further includes:
Salt treatment is crystallized, according to hazardous chemical waste disposal crystal salt.
Landfill leachate full dose treatment process provided in an embodiment of the present invention, comprising the following steps: pretreatment adjusts rubbish
The physico-chemical property of rubbish percolate simultaneously removes the suspended matter in landfill leachate and bulky grain pollutant；Film infiltration processing, is located in advance
The landfill leachate of reason carries out film infiltration processing, the concentrate and infiltration retained by reverse osmosis membrane under the first preset pressure
The first saturating clear liquid；Softening is except hard processing, and into concentrate, addition removes hard agent, to reduce the hardness of concentrate；Wherein, except hard heavy
Starch is the first sludge；It is pre- in the second preset pressure and first to be removed the concentrate handled firmly for the processing of double base catalytic wet oxidation
If open loop chain rupture is carried out to the organic matter in concentrate at a temperature of；Evaporation process, it is dense to being handled through double base catalytic wet oxidation
Contracting liquid is evaporated processing, obtains crystal salt and the second clear liquid；Subsequent processing carries out subsequent place to the first clear liquid and the second clear liquid
Reason obtains qualified discharge liquid.In this way, avoiding except hard processing by softening and being evaporated place in the concentrate to landfill leachate
When reason, the excessive high hardness of percolate, the case where leading to evaporation equipment fouling generation reduces the cleaning difficulty of system, ensure that
The longtime running of system；Also, it is handled by double base catalytic wet oxidation, the humic that will contain in the concentrate of landfill leachate
The organic matters such as acid, humus carry out open loop chain rupture processing, and larger molecular organics are degraded to subset, avoid and evaporating
Organic matter and water generate azeotropic effect in journey, form viscous gum, cause evaporator can not normal table operation the case where hair
It is raw, improve the treatment effeciency of kettle residual degree of drying and the concentrate to landfill leachate.
Landfill leachate full dose treatment process provided in an embodiment of the present invention achieves following process advantage:
1) film infiltration processing uses special membrane SUPER RO+ rolling RO, since SUPER RO has higher behaviour compared with rolling RO
Make pressure, operating pressure can be used for sewage treatment, to water inlet water in 20bar ~ 180bar, and since special structure designs
Matter is of less demanding, and the runner of SUPER RO is 2.5mm, and the runner of traditional coiled RO is 0.4mm ~ 1.5mm, the stream of SUPER RO
Road is wider, is not easy contaminated object blocking, and is concentrated that liquid measure is few, reduces the cost of investment in evaporation process stage.
2) it is handled using double base catalytic wet oxidation, open loop chain rupture can be carried out for organic substance, finally with H2O, CO2, sulphur
Hydrochlorate, the forms such as nitrate exist, effectively the organic matters such as degradation removal humic acid, humus, are being evaporated place to concentrate
When reason, it can be generated to avoid the azeotropic effect between organic matter and water, so that evaporation process is more thorough, directly obtain crystallization
Salt realizes the full quantification treatment of landfill leachate.
3) entire technique is based on materialization, no leachate recirculation, and there is no the enrichments of pollutant, avoids common process biochemical
The unstability and uncertainty that system is generated by water quality complexity.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of landfill leachate full dose treatment process, which is characterized in that the treatment process the following steps are included:
Pretreatment adjusts the physico-chemical property of landfill leachate and removes the suspended matter in the landfill leachate and bulky grain pollution
Object；
Film infiltration processing, pretreated landfill leachate are carried out at film infiltration under the first preset pressure by reverse osmosis membrane
Reason, the first clear liquid of the concentrate retained and infiltration；
Softening is handled except hard, and addition removes hard agent in Xiang Suoshu concentrate, to reduce the hardness of the concentrate；Wherein, except hard heavy
Starch is the first sludge；
The processing of double base catalytic wet oxidation is removed the concentrate handled firmly under the second preset pressure and the first preset temperature to institute
The organic matter stated in concentrate carries out open loop chain rupture；
Evaporation process is evaporated processing to the concentrate handled through double base catalytic wet oxidation, obtains crystal salt and second clearly
Liquid；
Subsequent processing carries out subsequent processing to first clear liquid and second clear liquid and obtains qualified discharge liquid.
2. landfill leachate full dose treatment process according to claim 1, which is characterized in that the pretreatment is adjusted
The physico-chemical property of landfill leachate simultaneously removes the suspended matter in the landfill leachate and bulky grain pollutant, comprising:
The physico-chemical property of the landfill leachate is adjusted in conditioning tank；
Landfill leachate through adjusting physico-chemical property is subjected to sand filtration processing, obtains the second sludge and the first percolate；
First percolate is filtered through bag filter.
3. landfill leachate full dose treatment process according to claim 1, which is characterized in that the film infiltration processing,
Pretreated landfill leachate carries out film infiltration processing, the concentration retained by reverse osmosis membrane under the first preset pressure
First clear liquid of liquid and infiltration, comprising:
The pretreated landfill leachate is carried out at film infiltration under the first preset pressure by least one level reverse osmosis membrane
Reason.
4. landfill leachate full dose treatment process according to claim 1, which is characterized in that subsequent processing, to described
First clear liquid and second clear liquid carry out subsequent processing and obtain qualified discharge liquid, comprising:
First clear liquid and second clear liquid are subjected to reverse osmosis treatment by coiled reverse osmosis membrane, obtain the row up to standard
Tapping and concentrating return-flow liquid.
5. landfill leachate full dose treatment process according to claim 4, which is characterized in that described by described first
Clear liquid and second clear liquid are by coiled reverse osmosis membrane progress reverse osmosis treatment, later further include:
Advanced treating removes ammonia nitrogen and total nitrogen content using resin adsorption, obtains the qualified discharge liquid.
6. landfill leachate full dose treatment process according to claim 4, which is characterized in that by first clear liquid and
Second clear liquid carries out reverse osmosis treatment by coiled reverse osmosis membrane, obtains the qualified discharge liquid and concentrating return-flow liquid, it
Afterwards further include:
The concentrating return-flow liquid is flowed back, and is handled through the film infiltration.
7. landfill leachate full dose treatment process according to claim 2, which is characterized in that the treatment process is also wrapped
It includes:
Sludge dewatering carries out thickening to first sludge and second sludge；Obtain mud cake and filters pressing phegma；
To the mud cake landfill disposal.
8. landfill leachate full dose treatment process according to claim 7, which is characterized in that sludge dewatering, to described
First sludge and second sludge carry out thickening；Mud cake and filters pressing phegma are obtained, later further include:
The filters pressing phegma is flowed back, and is handled through the sand filtration.
9. landfill leachate full dose treatment process according to claim 1, which is characterized in that the treatment process is also wrapped
It includes:
Salt treatment is crystallized, according to crystal salt described in hazardous chemical waste disposal.
10. landfill leachate full dose treatment process according to claim 1, which is characterized in that described except hard agent includes
At least one of quick lime, sodium hydroxide, sodium carbonate, aluminium polychloride, polyacrylamide.
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