CN109354292A - A kind of minimizing treatment process of landfill leachate film-filter concentration liquid - Google Patents

A kind of minimizing treatment process of landfill leachate film-filter concentration liquid Download PDF

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Publication number
CN109354292A
CN109354292A CN201811533848.5A CN201811533848A CN109354292A CN 109354292 A CN109354292 A CN 109354292A CN 201811533848 A CN201811533848 A CN 201811533848A CN 109354292 A CN109354292 A CN 109354292A
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liquid
film
concentration
landfill leachate
minimizing
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田黎黎
周俊
蔡斌
高新
肖宇轩
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Hunan Military Environmental Protection Ltd By Share Ltd
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Hunan Military Environmental Protection Ltd By Share Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56Macromolecular compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06Contaminated groundwater or leachate
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/14Maintenance of water treatment installations
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/12Activated sludge processes
    • C02F3/1236Particular type of activated sludge installations
    • C02F3/1268Membrane bioreactor systems

Abstract

The invention discloses a kind of minimizing treatment process of landfill leachate film-filter concentration liquid, include the following steps: NF concentrate and RO concentrate carrying out allotment mixing, liquid after being deployed;Iron chloride and polyacrylamide is added after to allotment in liquid, is stirred, flocculation sedimentation, obtains supernatant and sludge;The pH of supernatant is adjusted to 6.1~6.6, two sections of CSM film minimizing processing is then carried out, obtains clear liquid and retention dope;Gained clear liquid is evaporated, obtains concentrated mother liquor and through condensing obtained condensed water;By gained sludge, retention dope and concentrated mother liquor recharge landfill yard or return to incinerator progress burning disposal.Treatment process cycles of concentration of the invention is high, effluent quality can reach that 2 standard of " GB 16889-2008 " table, operation cost be low, technique realizes that difficulty is low, pollution is low, can effectively realize the minimizing of landfill leachate film-filter concentration liquid.

Description

A kind of minimizing treatment process of landfill leachate film-filter concentration liquid
Technical field
The present invention relates at technical field of sewage more particularly to a kind of minimizing of landfill leachate film-filter concentration liquid Science and engineering skill.
Background technique
About 8000 tons of the daily yield of Changsha house refuse at present, wherein about 2000 tons be used for sanitary landfills, 6000 tons Burning disposal.Extruding of the new refuse by sanitary landfills or before burning, generates about 3200 tons of garbage filter liquid measure daily (moisture content about 40%), processing of the percolate Jing Guo " water inlet+water quality equilibrium+external MBR+UF+NF/RO system+qualified discharge " After process, generate 480~800 tons of film-filter concentration liquid daily (film-filter concentration liquid generates ratio and calculates by 15~25%).
Percolate uses the treatment process of " water inlet+water quality equilibrium+external MBR+UF+NF/RO system+qualified discharge ", Wherein ultrafiltration membrane (UF) is to be sieving through using pressure as motive force using the physics that ultrafiltration membrane different pore size separates liquid Journey is the membrane separation technique using pressure as motive force.It separates aperture and occupy between nanofiltration (NF) and micro-filtration (MF), generally exists 0.001~0.05 μm, molecular cut off range is 1000~100000 dalton, and operating pressure is generally 3~10bar.It Separating mechanism is mainly to lean on the sieving actoion of physics, be after applying certain pressure to feed liquid, polymer substance, colloidal substance because The primary absorption of film surface and micropore, be blocked in hole and retain and the mechanical grading of film surface effect etc. three kinds of modes surpassed Filter membrane prevents, and water and lower-molecular substance pass through film.When the system is stable, through the COD (COD) of ultrafiltration membrane clear liquid Content is 400~800mg/L, and conductivity (k) is 11~14ms/cm, and ammonia nitrogen concentration is 2~10mg/L.
Ultrafiltration clear liquid need to be separated by filtration further across NF/RO film, wherein nanofiltration (NF) isolation technics principle similar mechanical Screening, but nanofiltration membrane body is with charge, therefore its separating mechanism can only say that similar mechanical sieves, while also have dissolution to expand Including dissipating effect, therefore, nanofiltration membrane still has under very low-pressure compared with high desalination performance and retention low-molecular-weight organic matter.Nanofiltration Process is poor lower than 200 rejection to organics to monovalention and molecular weight, and to divalent or multivalent ion and molecular weight between Organic matter between 200~500 has higher removal efficiency.The separation aperture of nanofiltration membrane be 1~10nm, operating pressure be 5~ 25bar.Reverse osmosis (RO) its particle separation diameter is less than 1nm, and separating particles rank can reach ionic level.Its separating mechanism is choosing Selecting property absorption-capillary stream mechanism: due to the hydrophily of film surface, Preferential adsorption hydrone and repel molecules of salt, therefore in film Epidermis forms the pure water layer of two hydrones (1nm), applies pressure, and the molecule of pure water layer constantly passes through capillary and flows through reverse osmosis Permeable membrane.With should system stablize, the control of nanofiltration clear liquid yield is 85%, and counter-infiltration clear liquid yield is controlled at 75%, through nanofiltration COD (COD) content of film clear liquid be 60~100mg/L, conductivity (k) be 11~14ms/cm, ammonia nitrogen concentration be 2~ 10mg/L, through reverse osmosis membrane clear liquid COD (COD) content be 5~10mg/L, conductivity (k) be 400~ 700us/cm, ammonia nitrogen concentration are 0~2mg/L.
According to NF/RO separation principle it is found that UF clear liquid about generates 15% film-filter concentration liquid after NF UF membrane, pass through 25% film-filter concentration liquid is about generated after RO UF membrane, two parts film-filter concentration liquid feature: organic concentration is high, salinity is high, can The features such as biochemical is poor, and complicated component, processing difficulty is big, and each specific Testing index of ingredient see the table below:
Landfill leachate film-filter concentration liquid is the residual solution that landfill leachate retains after biodegrade through NF/RO film, due to The selective penetrated property of permeable membrane, water energy enough passes through film, and other compounds are then more or less even rejected by completely, Water inlet is divided into two parts after film in this way, be respectively that treated penetrating fluid and film-filter concentration liquid, wherein film-filter concentration liquid Have the characteristics that: the features such as organic concentration is high, coloration is high, biodegradable difference and salt content is relatively high, processing difficulty is big, And it is at high cost, main ingredient is humus material, is in brownish black, and contain a large amount of metal ion.Nanofiltration and reverse osmosis The film-filter concentration liquid that saturating technique generates, TDS concentration are 20000~35000mg/L, and conductivity is 25000~45000us/cm, COD concentration is 2500~4000 mg/L, and ammonia nitrogen concentration is 5~20mg/L.
The treatment process of existing film-filter concentration liquid is numerous, wherein representative and more engineer application treatment process has Recharge method, membrane concentration method, coagulating sedimentation-advanced oxidation processes, evaporation-seasoning, electrochemical oxidation process etc..Recharge method, which will cause, fills out Building up for an organic matter and salinity is buried, highly concentrated percolate with high salt returns to biochemical system, will cause the rising of membrane tube pressure, system It runs extremely unstable.Membrane concentration method has a Central Asia Nanofiltering membrane, and this method clear liquid yield only 55~60%, cycles of concentration is 1~1.2 Times, and clear liquid water outlet cannot reach 2 standard of " GB 16889-2008 " table, and that there are operating pressures is high, energy consumption is high, producing water ratio is low, The problems such as fouling membrane is serious.Film-filter concentration liquid is handled using conventional evaporation, evaporated residue is danger wastes, so that evaporation Service life of equipment is short, cost of disposal is high with mixed.Retrogradation shallow lake-advanced oxidation processes processing film-filter concentration liquid is adopted, humic acid is directed to Substance removal effect is good, but remaining organic nitrogen material in concentrate, can be oxidized into nitrate nitrogen, and water outlet total nitrogen difficulty reaches Mark.Film-filter concentration liquid is handled using electrochemical oxidation process, this method cannot remove the hardness ions in film-filter concentration liquid, permanent to transport Guild causes electrolytic pole board, pipeline and reaction fouling blocking.
The concentrate that 201721625490.X discloses a kind of landfill leachate integrates reducing device, but uses the device The effluent quality of processing concentrate is not able to satisfy national standard discharge standard;201410231477.0 disclosing a kind of ozone Oxidation Treatment The processing method of percolate nanofiltration concentrate, but the effluent quality that this method obtains is not able to satisfy national standard discharge standard, and transports Row is costly.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide that a kind of cycles of concentration is high, water outlet water Mass-energy reaches the rubbish percolation liquid membrane that 2 standard of " GB 16889-2008 " table, operation cost are low, technique realization difficulty is low, pollution is low Landfill leachate film-filter concentration liquid can not only be effectively treated using the technique, especially in the minimizing treatment process of filter concentration liquid Effective place is able to achieve to the NF concentrate and RO concentrate that generate during early period, medium-term and long-term landfill age landfill leachate treatment Reason, and can finally realize the minimizing of landfill leachate film-filter concentration liquid, realize that film-filter concentration liquid is dirty for percolate industry The zero-emission target for contaminating object provides direction.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of minimizing treatment process of landfill leachate film-filter concentration liquid, includes the following steps:
S1, NF concentrate and RO concentrate are subjected to allotment mixing, liquid after being deployed;
S2, iron chloride and polyacrylamide are added into liquid after the allotment, are stirred, flocculation sedimentation, obtain supernatant with Sludge;
S3, the pH of supernatant is adjusted to 6.1~6.6, then carries out two sections of CSM film minimizing processing, obtains clear liquid and retention Dope;
S4, the clear liquid for obtaining S3 are evaporated, and are obtained concentrated mother liquor and are condensed obtained condensed water, after water cooling to be condensed It can discharge;
S5, concentrated mother liquor recharge landfill yard obtained by dope and step S4 will be retained obtained by sludge obtained by step S2, step S3 or returned It returns incinerator and carries out burning disposal.
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that described clear in the step S3 The total amount of liquid is the 95~97% of supernatant quality;
The COD concentration of the clear liquid is 1000~2000 mg/L, and ammonia nitrogen concentration is 0~2mg/L.
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that in the step S3, described two In section CSM film minimizing processing, the operating pressure of one section of film process is less than 4.5MPa, carries out to the dope that one section of film process obtains The operating pressure of two-segment film processing, the two-segment film processing is less than 6MPa;
One section of film process and the membrane component of two-segment film processing are RE8040SN membrane component;
One section of clear liquid yield of one section of film process is 80~85%, two sections of clear liquid yield of two-segment film processing are 75~ 80%。
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that in the step S3, described section The amount for staying dope is the 3~5% of the supernatant quality;
The COD concentration of the retention dope is 4000~10000mg/L, and ammonia nitrogen concentration is 20~60mg/L.
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that in the step S1, the tune With in rear liquid, COD concentration is 2500~4000mg/L, and ammonia nitrogen concentration is 5~20mg/L.
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that described cold in the step S4 The amount of condensate is the 90~95% of the clear liquid quality;The COD concentration of the condensed water be 20~80mg/L, ammonia nitrogen concentration be 0~ 5mg/L。
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that described dense in the step S4 The amount of contracting mother liquor is the 5~10% of the clear liquid quality;The COD concentration of the concentrated mother liquor is 20000~50000 mg/L, TDS Concentration is 400000~600000mg/L.
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that in the step S4, will be clear It further include being uniformly mixed clear liquid with defoaming agent before liquid is evaporated, and the step of carrying out the pre-heat treatment.
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that in the step S2, by quality Percentages, the additional amount of the iron chloride are 0.15~0.35% of liquid total amount after deploying, the addition of the polyacrylamide Amount is 0.002~0.008% of liquid total amount after deploying.
The minimizing treatment process of above-mentioned landfill leachate film-filter concentration liquid, it is preferable that in the step S4, the steaming The temperature of hair is 105~110 DEG C.
Compared with the prior art, the advantages of the present invention are as follows:
1, the characteristics of present invention is according to NF percolate and RO percolate obtains being suitable for rubbish percolation liquid membrane by numerous studies The advanced treatment process of filter concentration liquid, the present invention is by mixing NF percolate and RO percolate, first to the membrane filtration being mixed to get Concentrate carries out flocculation sedimentation and removes a part of COD, and the supernatant that flocculation sedimentation is obtained carries out film minimizing processing, and retention is rotten Acid is grown, then condensation is evaporated to the film decrement clear liquid obtained through film decrement treatment, condensation obtains condensate liquid and reaches " GB 16889-2008 " 2 standard of table, can direct emission, most COD, TDS and metal ion stay in evaporation dope, will The humic acid material and evaporation dope time is sprayed onto incinerator or recharge is filled out that a small amount of wadding body of flocculation sedimentation generation, film decrement generate Bury field.The present invention organically combines kinds of processes, that is, passes through the works such as flocculation sedimentation all linked with one another, film minimizing and evaporative condenser Skill, the total clear liquid rate obtained after processing are 85% or more, and processing cost is low, a small amount of sludge, humic acid material and the steaming that will be obtained It sends out dope and carries out burning disposal, the clinker of generation realizes efficient process landfill leachate for the useless landfill of ash or recharge landfill yard The target of pollutant.
2, in entire technical process of the invention, due to organic cooperation of entire technique, each step design is rationally, not only dense Demagnification number can be up to 10~20 times, and treatment effeciency is high, and small to equipment damage, pollute extremely low, and operating cost is low, technology difficulty It is low.
Detailed description of the invention
Fig. 1 is the flow chart of the advanced treatment process of landfill leachate film-filter concentration liquid of the invention.
Specific embodiment
The present invention is described in further details below with reference to Figure of description and specific embodiment.
A kind of advanced treatment process of landfill leachate film-filter concentration liquid of the invention, process flow chart is as shown in Figure 1, packet Include following steps:
(1) waste water is deployed
NF concentrate and RO concentrate are delivered to pretreatment conditioning tank with elevator pump, the two is uniformly mixed, by deploying NF The proportion of concentrate and RO concentrate realizes the adjusting that water, water quality are carried out to film-filter concentration liquid, and the rubbish obtained after adjusting seeps The COD concentration of filtrate film-filter concentration liquid is 2500~4000mg/L, and ammonia nitrogen concentration is 5~20mg/L, if COD and ammonia nitrogen in water quality Excessive concentration is discharged it is difficult to ensure that up to standard, if COD and ammonia nitrogen concentration are too low in water quality, there are the wastes of process equipment.
(2) flocculation sedimentation
Landfill leachate film-filter concentration liquid after waste water is deployed is delivered in stirred tank, and tri-chlorination is added into stirred tank Iron and polyacrylamide, by blender in stirred tank ferric trichloride and polyacrylamide and film-filter concentration liquid it is sufficiently mixed It closes, carries out coagulating, the flocculation mixed liquor after reaction is added to sedimentation basin and is precipitated, the supernatant of sedimentation basin flows into clear In liquid collecting tank, the sludge in sedimentation basin is periodically discharged, and is transported to refuse landfill.Preferably, the additional amount of ferric trichloride is The 0.15~0.35% of landfill leachate film-filter concentration liquid gross mass, the additional amount of polyacrylamide are that landfill leachate membrane filtration is dense The 0.002~0.008% of contracting liquid gross mass.
Supernatant C OD concentration after flocculation sedimentation is 1500~2500mg/L, and ammonia nitrogen concentration is 5~20mg/L.Pass through wadding After retrogradation is formed sediment, not a half COD content can be removed, is conducive to carry out subsequent film minimizing processing.
This step is after flocculation sedimentation, and can degrade partial organic substances, reduces content of organics in waste water, removes simultaneously Fall the suspended material in waste water, keep the sewage matter into film more preferable, prevents subsequent pollution and blocking to film.
(3) pH is adjusted
Supernatant after precipitation is delivered to pH conditioning tank, film minimizing is delivered to after pH is adjusted to 6.1~6.6 by acid adding Device.
(4) film minimizing
This step is handled using the minimizing of CSM film, and film minimizing device includes water inlet storage tank, membrane component, intake pump, pressurization Pump, circulating pump and cleaning system.The membranous system of the device is run using two-part, using RE8040SN membrane component, one section and two It is serially connected between section, i.e. one section of mother liquor enters two-segment film element, and one section of clear liquid and two sections of clear liquids are combined into evaporative crystallization dress It sets, two sections of dopes return spray incinerator or return landfill yard.Specific steps include: by elevator pump that the supernatant of pH conditioning tank is defeated It send to CSM film minimizing device, controls flow of inlet water in 10~30m3/ h after being pressurized by booster pump, is recycled by first segment Pump is delivered to first segment membrane component, controls one section of clear liquid yield 80~85%, operating pressure is less than 4.5MPa;First segment dope It produces water and is delivered to second segment membrane component by second segment circulating pump, control two sections of clear liquid yield 75~80%, operating pressure is less than 6MPa;Wherein second segment dope is produced water and is collected using dedicated dope case, and first segment clear water and second segment clear water are combined into evaporation Unit;Meanwhile the device configures cleaning system, periodically cleans to membranous system, guarantees stable.Cleaning process and operation Water (flow) direction is consistent in flowchart process, the water inlet of cleaning process into be recycle-water, chemical cleaning frequency is according to fouling membrane situation Periodically carry out chemical cleaning.In this step, by mass percentage, total clear liquid yield total 95~97%, mother liquor adds up to accounting 3 ~5%, main component is humic acid material.
Humic acid material can be removed by lower-cost minimizing processing, obtained clear liquid COD concentration is 1000 ~2000mg/L, ammonia nitrogen concentration be 0~2mg/L, mother solution C OD concentration be 4000~10000mg/L, ammonia nitrogen concentration be 20~ 60mg/L, it is high that the clear liquid that minimizing is handled obtains liquid rate, and clear liquid is applicable in subsequent evaporation process.
After this step removes the organic matters such as humic acid, subsequent evaporation process can not only be made not easy to foaming, guarantee water outlet Stablize, and salinity is easier to be precipitated in subsequent evaporation process, vapor is easily discharged, and processing power consumption is lower, and cost is lower;And it evaporates Residuals salt content relative increase afterwards, thick substances are opposite to be reduced, and prevented from caking, cleaning is simple.
(5) it evaporates
Vaporising device includes inlet unit, cycling element, recovery unit, steam supplementary units and outlet concentrate unit.The steaming The step of hair includes: to be uniformly mixed minimizing clear liquid and defoaming agent, and the additional amount of defoaming agent is minimizing clear liquid quality 0.01~0.05%, mixed liquor is promoted to by time heat exchanger by elevator pump and carries out the pre-heat treatment, then by intake pump by recycling Pump enters main heat exchanger, is finally transported to evaporator and is evaporated, and evaporation process controls temperature between 105~110 DEG C, steams It sends out the steam generated to compress into mechanical vapor compressor, water vapour is heated up, boosted by vapour compression machine, and steam is sent to later The cleaning end of main heat exchanger, inside main heat exchanger, the steam of high temperature and high pressure by its latent heat and is shown by the plate of heat exchanger Heat passes to the concentrated water of circulation, the steam condensation Cheng Shui after heat exchange, and condensate liquid preheats water inlet in secondary heat exchanger, and makes to produce Condensed water out is cooling.
After the device evaporative crystallization, condensed water water outlet can reach 2 standard of " GB 16889-2008 " table, wherein leading Wanting index COD concentration is 20~80mg/L, and ammonia nitrogen concentration is 0~5mg/L, and by mass percentage, condensed water yield can reach To 90~95%, obtained evaporation and concentration mother solution C OD concentration is 20000~50000mg/L, TDS concentration is 400000~ 600000mg/L, between mother liquor accounting about 5~10% (10~20 times of cycles of concentration), mother liquor amount is few, can be directly used for incinerator It returns spray or carries out the solidification backfill of landfill yard.
The high advantage of cycles of concentration: 1, processing cost is low;2, minimizing degree is high, and residual contamination greatly reduces;3, equipment Obtain greatest benefit.4, it produces clear water and becomes more.
(6) it discharges
Evaporation condensed water is subjected to cooling processing, detects rear discharge up to standard.
In the present invention, total clear liquid yield is up to 85% or more, and processing cost is low, and final realization zero release of pollutant standard, The condensed water generated in treatment process reaches discharge standard, flocculation sedimentation generates a small amount of sludge, the humic acid moieties that extract, with And the amount of evaporation generation mother liquor is relatively fewer, can return and be sprayed onto incinerator, the clinker of generation is for the useless landfill of ash.
Embodiment 1
A kind of advanced treatment process of landfill leachate film-filter concentration liquid of the invention, process flow chart is as shown in Figure 1, include such as Lower step:
(1) landfill leachate generated to landfill refuse landfill in 10 years uses " water inlet+water quality equilibrium+external MBR+
The treatment process of UF+NF/RO system+qualified discharge " is handled, and generates nanofiltration in treatment process and reverse osmosis membrane filtration is dense Contracting liquid, yield 240t/d.The NF concentrate of generation and RO concentrate are delivered to pretreatment conditioning tank with elevator pump, then It mixed, deployed, obtaining COD value is 2553mg/L, liquid after the allotment that ammonia nitrogen concentration 8mg/L, TDS are 27500mg/L.
(2) ferric trichloride and polyacrylamide, the additional amount of iron chloride are allotments in liquid after the allotment obtained to step (1) The 0.18wt.% of liquid total amount afterwards, the additional amount of polyacrylamide are the 0.003wt.% of liquid total amount after allotment, are stirred by blender Uniformly, coagulating 2h, the wadding body generated after precipitating removal flocculation, obtained supernatant C OD value is 1972mg/L, ammonia nitrogen concentration For 7.5mg/L.
(3) by the concentrated hydrochloric acid tune pH to 6.4 of step (2) resulting supernatant 33wt%, into film minimizing device, control Making one section of clear liquid yield control is 82%, and two sections of clear liquid yield controls are 78%, extracts the dope accounting of shutting off of humic acid moieties 3.96%, the COD value of clear liquid accounting 96.04%, clear liquid is 1520mg/L, and ammonia nitrogen concentration 1.8mg/L, TDS concentration is 21800mg/L。
(4) clear liquid obtained by step (3) and defoaming agent are uniformly mixed, the additional amount of defoaming agent is gained clear liquid 0.04wt.%, then it is promoted to evaporator, control temperature is at 108 DEG C, and 93%, condensed water water outlet is main to be controlled the control of condensed water yield Index processed: COD value 68mg/L, ammonia nitrogen 2.1mg/L, pH=7.71, K=363us/cm.
Through detecting, the water outlet indices of final condensed water reach 2 standard of " GB 16889-2008 " table, entire technique mistake Total clear liquid yield in journey is 89.32%, in treatment process flocculation sedimentation generate a small amount of sludge, extract 3.96% humic acid portion The retention dope and evaporation divided generates the direct recharge landfill yard of 6.72% mother liquor.
Embodiment 2
A kind of advanced treatment process of landfill leachate film-filter concentration liquid of the invention, process flow chart is as shown in Figure 1, include such as Lower step:
(1) landfill leachate generated to landfill refuse landfill in 15 years uses " water inlet+water quality equilibrium+external MBR+
The treatment process of UF+NF/RO system+qualified discharge " is handled, and generates nanofiltration in treatment process and reverse osmosis membrane filtration is dense Contracting liquid, yield 640t/d.The NF concentrate of generation and RO concentrate are delivered to pretreatment conditioning tank with elevator pump, then Mixed, deployed, after to obtain COD value be 3250mg/L, liquid after the allotment that ammonia nitrogen 7mg/L, TDS are 32700mg/L.
(2) ferric trichloride is added in liquid after the allotment obtained to step (1) and polyacrylamide, the additional amount of iron chloride is The 0.26wt% of liquid total amount after allotment, the additional amount of polyacrylamide are the 0.004wt% of liquid total amount after allotment, are stirred by blender It mixes uniformly, coagulating 2h, the wadding body generated after precipitating removal flocculation, obtained supernatant C OD value is 2764mg/L, and ammonia nitrogen is dense Degree is 6.6mg/L.
(3) by the concentrated hydrochloric acid tune pH to 6.5 of supernatant 34wt% obtained by step (2), into film minimizing device, control One section of clear liquid yield control is 81%, and two sections of clear liquid yield controls are 77%, extracts the dope accounting of shutting off of humic acid moieties 4.37%, the COD value of clear liquid accounting 95.63%, clear liquid is 1938mg/L, and ammonia nitrogen concentration 1.6mg/L, TDS concentration is 27600mg/L。
(4) clear liquid obtained by step (3) and defoaming agent are uniformly mixed, the additional amount of defoaming agent is gained clear liquid 0.05wt.%, then it is promoted to evaporator, control temperature is at 109 DEG C, and 92%, condensed water water outlet is main to be controlled the control of condensed water yield Index processed: COD value 77mg/L, ammonia nitrogen concentration 2.8mg/L, pH=7.59, K=337us/cm.
Through detecting, the water outlet indices of final condensed water reach 2 standard of " GB 16889-2008 " table, entire technique mistake Total clear liquid yield in journey is 87.98%, and flocculation sedimentation generates a small amount of sludge, extracts 4.37% humic acid moieties in treatment process Retention dope and evaporation generate 7.65% mother liquor and directly return and be sprayed onto incinerator.
Although the present invention is disclosed as above with preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with ability The technical staff in domain, without deviating from the scope of the technical scheme of the present invention, all using the technology contents pair of the disclosure above Technical solution of the present invention makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all Without departing from the content of technical solution of the present invention, according to the present invention technical spirit any simple modification made to the above embodiment, Equivalent variations and modification, all shall fall within the protection scope of the technical scheme of the invention.

Claims (10)

1. a kind of minimizing treatment process of landfill leachate film-filter concentration liquid, which comprises the steps of:
S1, NF concentrate and RO concentrate are subjected to allotment mixing, liquid after being deployed;
S2, iron chloride and polyacrylamide are added into liquid after the allotment, are stirred, flocculation sedimentation, obtain supernatant with Sludge;
S3, the pH of supernatant is adjusted to 6.1~6.6, then carries out two sections of CSM film minimizing processing, obtains clear liquid and retention Dope;
S4, the obtained clear liquid of step S3 is evaporated, obtains concentrated mother liquor and through condensing obtained condensed water;
S5, concentrated mother liquor recharge landfill yard obtained by dope and step S4 will be retained obtained by sludge obtained by step S2, step S3 or returned It returns incinerator and carries out burning disposal.
2. the minimizing treatment process of landfill leachate film-filter concentration liquid as described in claim 1, which is characterized in that the step In rapid S3, the total amount of the clear liquid is the 95~97% of supernatant quality;
The COD concentration of the clear liquid is 1000~2000 mg/L, and ammonia nitrogen concentration is 0~2mg/L.
3. the minimizing treatment process of landfill leachate film-filter concentration liquid as described in claim 1, which is characterized in that the step In rapid S3, in two sections of CSM film minimizing processing, the operating pressure of one section of film process is less than 4.5MPa, to one section of film process Obtained dope carries out two-segment film processing, and the operating pressure of the two-segment film processing is less than 6MPa;
One section of film process and the membrane component of two-segment film processing are RE8040SN membrane component;
One section of clear liquid yield of one section of film process is 80~85%, two sections of clear liquid yield of two-segment film processing are 75~ 80%。
4. the minimizing treatment process of landfill leachate film-filter concentration liquid as described in claim 1, which is characterized in that the step In rapid S3, the amount of the retention dope is the 3~5% of the supernatant quality;
The COD concentration of the retention dope is 4000~10000mg/L, and ammonia nitrogen concentration is 20~60mg/L.
5. the minimizing treatment process of landfill leachate film-filter concentration liquid as described in claim 1, which is characterized in that the step In rapid S1, after the allotment in liquid, COD concentration is 2500~4000mg/L, and ammonia nitrogen concentration is 5~20mg/L.
6. the minimizing treatment process of landfill leachate film-filter concentration liquid as claimed in any one of claims 1 to 5, wherein, feature It is, in the step S4, the amount of the condensed water is the 90~95% of the clear liquid quality;The COD concentration of the condensed water is 20~80mg/L, ammonia nitrogen concentration are 0~5mg/L.
7. the minimizing treatment process of landfill leachate film-filter concentration liquid as claimed in any one of claims 1 to 5, wherein, feature It is, in the step S4, the amount of the concentrated mother liquor is the 5~10% of the clear liquid quality;The COD of the concentrated mother liquor is dense Degree is 20000~50000 mg/L, and TDS concentration is 400000~600000mg/L.
8. the minimizing treatment process of landfill leachate film-filter concentration liquid as claimed in any one of claims 1 to 5, wherein, feature It is, further includes being uniformly mixed clear liquid with defoaming agent, and preheated before being evaporated clear liquid in the step S4 The step of processing.
9. the minimizing treatment process of landfill leachate film-filter concentration liquid as claimed in any one of claims 1 to 5, wherein, feature Be, in the step S2, by mass percentage, the additional amount of the iron chloride be allotment after liquid total amount 0.15~ 0.35%, the additional amount of the polyacrylamide is 0.002~0.008% of liquid total amount after deploying.
10. the minimizing treatment process of landfill leachate film-filter concentration liquid as claimed in any one of claims 1 to 5, wherein, special Sign is, in the step S4, the temperature of the evaporation is 105~110 DEG C.
CN201811533848.5A 2018-12-14 2018-12-14 A kind of minimizing treatment process of landfill leachate film-filter concentration liquid Pending CN109354292A (en)

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