CN107098496A - Preprocess method and its device that PU chemical leather DMF waste liquor rectifications are reclaimed - Google Patents

Preprocess method and its device that PU chemical leather DMF waste liquor rectifications are reclaimed Download PDF

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Publication number
CN107098496A
CN107098496A CN201710217979.1A CN201710217979A CN107098496A CN 107098496 A CN107098496 A CN 107098496A CN 201710217979 A CN201710217979 A CN 201710217979A CN 107098496 A CN107098496 A CN 107098496A
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dmf
dmf waste
waste liquids
sludge
flow
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林春绵
任元彬
王美华
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Jiang University Of Technology
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Jiang University Of Technology
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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
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/5263Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical 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
    • C02F1/52Treatment 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
    • C02F2001/007Processes including a sedimentation step
    • 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
    • C02F2103/22Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
    • C02F2103/24Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/10Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/16Regeneration of sorbents, filters

Abstract

The invention provides the preprocess method and its device that a kind of PU chemical leather DMF waste liquor rectifications are reclaimed, described preprocess method includes:Preliminary filtering-flocculation reaction-precipitation separation-depth separation;DMF waste liquids remove the suspension of particle diameter >=300 μm by coarse filter, then contact mixing with coagulant, flocculation aid and micro- sand successively, occur loading flocculation reaction, remove most wood powder, chopped fiber and oligomer in DMF waste liquids;Last hollow fiber ultrafiltration membrane depth particle separation diameter >=1 μm solid suspension and oligomer;DMF waste liquids turbidity, SS clearances are up to 99.6%, more than 97.5%, and remaining turbid and SS controls are in 1NTU and below 10mg/L;Enter distillation system through the pretreated DMF waste liquids of the inventive method, stopping production washes tower frequency and drops to 2 times/year by 1~2 time/month, while the generation of secondary pollution is greatly reduced, reduces energy consumption, realize energy-saving and emission-reduction.

Description

Preprocess method and its device that PU chemical leather DMF waste liquor rectifications are reclaimed
(1) technical field
The present invention relates to a kind of preprocess method and its special purpose device of DMF waste liquids, and in particular to a kind of PU synthetic leather row Preprocess method and its special purpose device that industry DMF waste liquor rectifications are reclaimed.
(2) background technology
In recent years, China's artificial synthetic leather industry development is rapid, and demand constantly expands.In PU synthetic leather production processes In, the non-woven fabrics for scribbling polyurethane resin successively enters in coagulating basin and rinsing bowl, and DMF is dissolved in water as resin solvent and produced therewith The DMF waste liquids of raw a large amount of 18%~20% concentration.Mainly DMF is recycled by three tower cascade connected distillation system at present. A certain amount of wood powder (resin inserts raw material), chopped fiber (coming from leather base cloth) and oligomer etc. are usually contained in DMF waste liquids outstanding Floading condition or solubilised state high-molecular compound.Therefore, it can produce that larger amount of kettle is residual to make rectifying tower in DMF rectification-recovery process Kettle fouling, causes heat transfer efficiency to reduce, it has to frequently wash tower.This loss that can not only cause DMF and the increase of energy consumption, can also The high concentration that producing need to largely be handled washes tower waste water.Tower reactor fouling also easily causes the decomposition that tower reactor hot-spot causes DMF, and by This produces dimethylamine (DMA) waste gas.Therefore optimization DMF rectification process is for promoting synthetic leather industry energy-saving emission reduction to have great Meaning.
The index of correlation of DMF waste liquids is:Turbidity 360~410mg/L of 180~260NTU, SS, Zeta potential -12.1~ 13.0mV, UV254(10 times of dilution) 1.379, waste liquid is in sepia or orange, water turbidity.
Industrial DMF waste liquids do not take pretreatment before entering rectifying recovery system at present, are related to DMF waste liquids and locate in advance Reason research has extraction and membrane separation process.
Abstraction technique:The suitable extractant of selection, is transferred to extractant phase from aqueous phase by DMF, is then separated back through rectifying DMF is received, the impurity such as wood powder stays in aqueous phase and enters Waste Water Treatment.Result of study shows, can be real with chloroform Pyatyi counter-current extraction Now good DMF recovering effects, but chloroform toxicity is stronger.
Membrane separation process:Hollow fiber ultrafiltration membrane can retain organic matter and suspension.It is preferable that result of study shows that ultrafiltration has Solid-liquid separation effect, the PP materials film of selection is under 0.2Mpa intake pressures, and turbidity can drop to 1NTU by 600NTU.But it is single The problems such as solely using ultrafiltration membrane technique, membrane module blocking pollution causes operating cost too high, and backwash operation is frequent, it is difficult in reality Popularization and application in the industry of border.
(3) content of the invention
Rectifying column operational efficiency present in DMF devil liquor recovery distillation processes for PU synthetic leather is low, high energy consumption, kettle are residual It is many, wash the problems such as tower is frequently easily decomposed with DMF.A kind of pre- place before being reclaimed the invention provides PU chemical leather DMF waste liquor rectifications Reason technology, using loading flocculation-hyperfiltration process, realizes the turbidity of DMF waste liquids, SS clearances up to 99.6%, more than 97.5%, It is expected to solve or significantly mitigate above mentioned problem.
The present invention is adopted the following technical scheme that:
It is a kind of for PU chemical leather DMF waste liquor rectifications reclaim preprocess method device, described device by DMF storage tanks, Coarse filter, flocculation reaction device, vertical-flow stillpot, medial launder, ultra-filtration membrane device, production pond, sludge-tank, filter press, medicine are washed Tank, filtrate recovery pond are constituted;
The flocculation reaction device is in series by mixing channel, filling groove, digester successively, and each groove is equipped with mixer; The DMF storage tanks, coarse filter, flocculation reaction device, vertical-flow stillpot, medial launder, ultra-filtration membrane device, production pond are gone here and there successively Connection;The sludge-tank is connected to vertical-flow stillpot;The filter press is connected to sludge-tank;The medicine cleaning of evaporator is connected to milipore filter Device;The filtrate recovery pond is connected with DMF storage tanks, ultra-filtration membrane device, filter press respectively.
The preprocess method that a kind of PU chemical leather DMF waste liquor rectifications are reclaimed, described preprocess method is:
(1) the DMF waste liquids for being produced PU synthetic leather wet production line using elevator pump are squeezed into coarse filter from DMF storage tanks and carried out Primary separation;
Described coarse filter is:The filter screen being made up of stainless steel material, the specification of the filter screen is 40~60 mesh;
(2) the DMF waste liquids gravity flow by step (1) primary separation enters in flocculation reaction device, flows automatically successively through overmulling Close groove, filling groove, digester and carry out loading flocculation reaction;
In described mixing channel (by automatic medicine adding apparatus) dosing coagulant aluminium polychloride (PAC), dosage with Al is calculated as 82.5~165mg/L DMF waste liquids, and it is 1~3min that 250~350r/min, which stirs the waste liquid residence time under speed,;
(by automatic medicine adding apparatus) while adding the flocculation aid of 0.5~2mg/L DMF waste liquids in described filling groove The quartz sand (mesh of particle diameter 120~250) of PAMC (CPAM) and 0.5~2g/L DMF waste liquids, 120~180r/ It is 3~5min that min, which stirs under speed the waste liquid residence time,;
DMF waste liquids gravity flow afterwards enters digester, and it is shape in 3~5min of stop, DMF waste liquids that 70~120r/min, which is stirred under speed, Into using quartz sand as wadding core, the larger floc particle of compactness;
(3) the DMF waste liquids gravity flow after step (2) loads flocculation reaction enters vertical-flow stillpot progress muddy water point From hydraulic detention time is 10~20min;
(4) supernatant in step (3) produced by mud-water separation enters medial launder by vertical-flow stillpot effluent weir overflow It is interior, then be evacuated to ultra-filtration membrane device from medial launder with elevator pump and carry out depth separation;
Described ultra-filtration membrane device is formed in parallel by hollow fiber film assembly, and it is 0.2m/s to set water inlet flow velocity, water of intaking Press as 0.2Mpa, DMF filtrates are squeezed into production pond after ultrafiltration, then are sent to distillation system;
The ultra-filtration membrane device is provided with pressure sensor, when hollow fiber film assembly because of blocking causes intake pressure to exceed During 0.4MPa, the inlet valve and elevator pump of ultra-filtration membrane device are successively closed, and after ultrafiltration in backwashing pump suction production pond DMF filtrates backwash to membrane module, and the pressure of the backwash is 0.05~0.2MPa, and backwashing time is 1~5min, Periodically acid in medicine cleaning of evaporator is separately added into successively with alkali using chemical cleaning pump with 7~14 days/time of frequency simultaneously backwashed Journey is to improve backwash effect (routine operation that the Process of Chemical Cleaning is known in the art), and counter-flushing liquid is flow automatically by filtrate hole Focused on to filtrate recovery pond;
The material of the hollow fiber film assembly is polypropylene screen (PP), membrane aperture 0.2um, membrane flux 40L/m2h;
(5) the bottom precipitation sludge in step (3) obtained by mud-water separation is discharged into sludge-tank by discharge pipeline using gravity, is led to Cross gravitational settling and be further concentrated to give the thickened sludge that moisture content is 97%~98%, the thickened sludge is transmitted by mortar pump Dehydration volume reduction treatment is carried out to plate and frame filter press;
The mud cake of moisture content 70%~75% after dehydration is through adding water 1:Mechanism filter-pressing again after 1 (mass ratio) dilution, to return The DMF remained in mud cake is received, mud cake, which is concentrated, after filter stacks, it is unified after desiccation to be dried to arrange outward transport disposal, sludge press filtration process The filtrate of generation is from flowing in filtrate recovery pond, and the boosted pump of the liquid collected in filtrate recovery pond is periodically squeezed into DMF storage tanks Again handled.
In the present invention, described DMF waste liquids come from PU synthetic leather wet production lines:Used in PU synthetic leather production processes Polyurethane PU resin is using DMF as solvent, and in wet production line, PU resins are applied in leather base cloth, then in coagulating basin and rinsing bowl In, DMF oozes out and soluble in water, and it is that heretofore described DMF gives up that the resulting waste water containing DMF, which is discharged into storage tank, Liquid.
The index of correlation of the DMF waste liquids is:Turbidity 360~410mg/L of 180~260NTU, SS, Zeta potential -12.1 ~-13.0mV, UV254(10 times of dilution) 1.379, DMF contents are 18%~20%, and waste liquid is in sepia or orange, and water quality is muddy It is turbid.
Advantage of the invention is that:
(1) flocculation sediment is as a ripe preconditioning technique, using universal in water treatment technology.Possess turbidity, Removal efficiency is high, and equipment requirement is low, simple to operate, the advantage such as investment and operating cost are cheap.
(2) sand loading flocculation technique compares traditional flocculation technique to possess the settling of floccus time short, settles good compression property, resistance to Impact load ability is strong, the features such as stable water outlet.The micro- sand for not making in sludge to reclaim simultaneously can be played in mechanism filter-pressing link to be helped Filter is acted on, and to reduce dry mud moisture content after filter, improves DMF recovery rate.
(3) loading flocculation --- ultrafiltration technology, at utmost removes turbidity, suspension and some oligomers in DMF waste liquids, To ensure the operational efficiency of distillation system.
The technical effects of the invention are that:
DMF waste liquids remove the suspension of particle diameter >=300 μm by coarse filter, then are contacted with coagulant, flocculation aid and micro- sand Mixing, occurs loading flocculation reaction, removes most wood powder, chopped fiber and oligomer in DMF waste liquids.Last doughnut surpasses Filter membrane depth particle separation diameter >=1 μm solid suspension and oligomer.DMF waste liquids turbidity, SS clearances up to 99.6%, 97.5% with On, remaining turbid and SS controls are in 1NTU and below 10mg/L.Enter distillation system through the pretreated DMF waste liquids of the inventive method, Stopping production washes tower frequency and drops to 2 times/year by 1~2 time/month, while the generation of secondary pollution is greatly reduced, reduces energy Consumption, realizes energy-saving and emission-reduction.
(4) illustrate
Fig. 1:The process chart for the pretreatment that PU chemical leather DMF waste liquor rectifications are reclaimed.
(5) embodiment
Below in conjunction with the accompanying drawings, that the technical scheme in implementing to the present invention is carried out is clear, be fully described by, but the protection of invention Scope is not limited to that.
Embodiment 1
A kind of method for the pretreatment that PU chemical leather DMF waste liquor rectifications are reclaimed:
Pre-treatment step includes:Preliminary filtering-flocculation reaction-precipitation separation-depth separation.
The DMF waste liquids of pretreatment mostly come from what is used in Zhejiang PU synthetic leather enterprise, PU synthetic leather production processes Polyurethane PU resin is using DMF as solvent, and in wet production line, PU resins are applied in leather base cloth, then in coagulating basin and rinsing bowl In, DMF oozes out and soluble in water.DMF waste liquid indexs of correlation are:Turbidity 260NTU, SS 410mg/L, Zeta potential -12.1mV, UV254(10 times of dilution) 1.379, DMF contents are 20%, and waste liquid is in sepia, water turbidity.
(1) preliminary filtering:DMF waste liquids squeeze into what 50 mesh stainless (steel) wires were constituted with the boosted pump of 20t/h flows by DMF storage tanks Coarse filter (the using and the reserved) carries out primary separation, removes the particulate matter of particle diameter >=300 μm, to improve subsequent load flocculation reaction effect Rate, reduces sludge yield, obtains coarse filtration DMF waste liquids;
(2) flocculation reaction:Flocculation reaction device is made up of mixing channel, filling groove, digester, and each groove is equipped with mixer, Described DMF waste liquids flow automatically successively carries out loading flocculation reaction by mixing channel, filling groove, digester, specific as follows:
DMF waste liquids gravity flow after primary filter enters the mixing channel for being parallel with PAC automatic medicine adding apparatus, 10% concentration Aluminium polychloride (PAC, Teng Long material for water treatment Co., Ltd, Al2O3Content 28%) coagulant dosage in terms of Al In 101.25mg/L input mixing channels, DMF waste liquids stop reaction 3min under 280r/min rotating speeds.Wood powder, short fibre in DMF waste liquids The suspended states such as peacekeeping oligomer or the de- steady cohesion of solubilised state high-molecular compound;Waste liquid subsequently into be parallel with PAM and micro- sand from In the filling groove of dynamic chemicals dosing plant, the PAMC of 0.2% concentration (CPAM, Teng Long material for water treatment Co., Ltd, Molecular weight 1,100 ten thousand) flocculation aid and 150~200 mesh particle diameters quartz sand respectively with dosage 1mg/L and 1g/L input filling groove In, DMF waste liquids residence time under mixer 150r/min rotating speeds is 5min.Flocculation aid polyacrylamide has good increasing Thick, overstriking effect, coordinates highdensity quartz sand is quick in DMF waste liquids to form the thick flco of consolidation;Flco mixed liquor is certainly Stream enters in digester, stops 3min in the case where mixer 100r/min stirs speed, suspension is roughened to be formed using quartz sand as core coacervation The larger floc particle of density, and coordinate net to catch fine suspension, larger molecular organicses and oligomeric in effect absorption DMF waste liquids Thing;
(3) precipitation separation:The boosted pump of mixed liquor that flocculates enters perpendicular stream stillpot, bucket body with 0.03m/s centers flow velocity Product can store sludge on the 2nd~3, and gravity concentration in sludge sump is discharged into through discharge pipeline using gravity.The surface loading of selection is no more than 1m3/m2H, turbidity and removal efficiency are up to 98.1% and 85% in perpendicular stream stillpot overflow DMF water outlets;
(4) depth is separated:DMF supernatants enter medial launder through downflow weir, and hollow fiber ultrafiltration membrane dress is evacuated to elevator pump Put, remove the colloidal sol shape solid suspension and some oligomers of particle diameter >=1 μm residual.Described ultra-filtration membrane device is by 480m2In Hollow fiber membrane module is formed in parallel, and its membrane flux is 40L/m2·h.Setting water feeding pressure is 0.2MPa, and device is passed provided with pressure Sensor, when hollow fiber film assembly causes intake pressure because of blocking more than 0.4MPa, stops lifting pump work and uses ultrafiltration DMF filtrates afterwards are backwashed, and the pressure of the backwash is 0.05~0.2MPa, and backwashing time is 1~2min, simultaneously Periodically hydrochloric acid in medicine cleaning of evaporator and sodium hydroxide solution are successively added using chemical cleaning pump with 10~12 days/time of frequency and recoiled Journey is washed to improve backwash effect, counter-flushing liquid flow to filtrate recovery pond certainly by filtrate hole and focused on, liquid after ultrafiltration Body is discharged into production pond, then is sent to distillation system;
(5) the bottom precipitation sludge in vertical-flow stillpot obtained by mud-water separation is discharged into sludge sump by discharge pipeline using gravity In, further concentrated by gravitational settling, moisture content is transmitted to plate compression for 97%~98% thickened sludge by mortar pump Machine carries out dehydration volume reduction treatment, and the sludge of moisture content 70%~75% after dehydration is through adding water 1:Machine again after 1 (mass ratio) dilution Tool press filtration, to reclaim the DMF remained in wet mud.Unified collect of mud cake is stacked after filter, unified after desiccation to be dried to arrange at outward transport Put.The filtrate that sludge press filtration process is produced is from flowing in filtrate recovery pond, and the boosted pump of the liquid collected in filtrate recovery pond is determined Phase squeezes into be handled again in DMF storage tanks.
For prevent each groove in influence that rainwater and dust storm are caused to water quality, above-mentioned flocculation reaction device, vertical-flow stillpot, Medial launder etc. is equipped with steel canopy.
Water outlet pH after being handled through ultra filtration hollow fiber membrane device is 5.5, turbidity and SS clearances up to 99.6% with More than 97.5%, remaining turbid control is in 1NTU and below 10mg/L.Enter rectifying system through the pretreated DMF waste liquids of the inventive method System, stopping production washes tower frequency and drops to 2 times/year by 1~2 time/month, and DMF recovery rate is improved to more than 99%, and is greatly reduced The generation of secondary pollution, reduces energy consumption, realizes energy-saving and emission-reduction.
Comparative example
Meanwhile, abstraction technique is also selected in experiment, reclaims the DMF in synthetic leather waste liquid.By ultra-violet analysis, extracted from chloroform Agent is taken, is R=2 in extraction solubility ratio, during 5 grades of series of extraction, extraction yield can reach 97.5%.Utilizing extraction tower multi-stage countercurrent After extraction, DMF residuals degree is 0.9%.But the boiling point of chloroform is relatively low, volatile in use, to the seal of container with The operating technology level requirement of workman is high, there is larger potential safety hazard.Therefore loading flocculation-hyperfiltration technique is more suitable for pretreatment DMF waste liquids.

Claims (4)

1. it is a kind of for PU chemical leather DMF waste liquor rectifications reclaim preprocess method device, it is characterised in that described device by DMF storage tanks, coarse filter, flocculation reaction device, vertical-flow stillpot, medial launder, ultra-filtration membrane device, production pond, sludge-tank, press filtration Machine, medicine cleaning of evaporator, filtrate recovery pond are constituted;
The flocculation reaction device is in series by mixing channel, filling groove, digester successively, and each groove is equipped with mixer;It is described DMF storage tanks, coarse filter, flocculation reaction device, vertical-flow stillpot, medial launder, ultra-filtration membrane device, production pond are sequentially connected in series;Institute State sludge-tank and be connected to vertical-flow stillpot;The filter press is connected to sludge-tank;The medicine cleaning of evaporator is connected to ultra-filtration membrane device; The filtrate recovery pond is connected with DMF storage tanks, ultra-filtration membrane device, filter press respectively.
2. the preprocess method that a kind of PU chemical leather DMF waste liquor rectifications are reclaimed, it is characterised in that described preprocess method is:
(1) the DMF waste liquids for being produced PU synthetic leather wet production line using elevator pump are squeezed into coarse filter from DMF storage tanks and carry out primary Separation;
(2) by step (1) primary separation DMF waste liquids gravity flow enter flocculation reaction device in, successively gravity flow by mixing channel, Fill groove, digester and carry out loading flocculation reaction;
The dosing coagulant aluminium polychloride in described mixing channel, dosage is calculated as 82.5~165mg/L DMF waste liquids with Al, It is 1~3min that 250~350r/min, which stirs under speed the waste liquid residence time,;
In described filling groove simultaneously add 0.5~2mg/L DMF waste liquids flocculation aid PAMC and 0.5~ The quartz sand of 2g/L DMF waste liquids, it is 3~5min that 120~180r/min, which stirs under speed the waste liquid residence time,;
DMF waste liquids gravity flow afterwards enters digester, 70~120r/min stir under speed formed in 3~5min of stop, DMF waste liquids with Quartz sand is wadding core, the larger floc particle of compactness;
(3) the DMF waste liquids gravity flow after step (2) loads flocculation reaction enters vertical-flow stillpot progress mud-water separation, water The power residence time is 10~20min;
(4) supernatant in step (3) produced by mud-water separation is entered in medial launder by vertical-flow stillpot effluent weir overflow, then Ultra-filtration membrane device is evacuated to medial launder with elevator pump and carries out depth separation;
Described ultra-filtration membrane device is formed in parallel by hollow fiber film assembly, and it is 0.2m/s to set water inlet flow velocity, and water feeding pressure is DMF filtrates are squeezed into production pond after 0.2MPa, ultrafiltration, then are sent to distillation system;
Ultra-filtration membrane device is provided with pressure sensor, when hollow fiber film assembly causes intake pressure because of blocking more than 0.4MPa When, the inlet valve and elevator pump of ultra-filtration membrane device are successively closed, and DMF filters after ultrafiltration in ultrafiltration water tank are aspirated by backwashing pump Liquid is backwashed to membrane module, and the pressure of the backwash is 0.05~0.2MPa, and backwashing time is 1~5min, simultaneously With 7~14 days/time of frequency periodically using chemical cleaning pump by medicine cleaning of evaporator acid with alkali be separately added into successively backwash process with Backwash effect is improved, counter-flushing liquid flow to filtrate recovery pond certainly by filtrate hole and focused on;
(5) the bottom precipitation sludge in step (3) obtained by mud-water separation is discharged into sludge-tank by discharge pipeline using gravity, passes through weight Power sedimentation is further concentrated to give the thickened sludge that moisture content is 97%~98%, and the thickened sludge is transmitted to plate by mortar pump Frame filter press carries out dehydration volume reduction treatment;
The sludge of moisture content 70%~75% after dehydration is through adding water 1:Mechanism filter-pressing again after 1 dilution, is remained with reclaiming in mud cake DMF, mud cake, which is concentrated, after filter stacks, unified after desiccation to be dried to arrange outward transport disposal, the filtrate that sludge press filtration process is produced from It flow in filtrate recovery pond, the boosted pump of the liquid collected in filtrate recovery pond is periodically squeezed into be handled again in DMF storage tanks.
3. the preprocess method that PU chemical leather DMF waste liquor rectifications as claimed in claim 2 are reclaimed, it is characterised in that step (1) In, described coarse filter is:The filter screen being made up of stainless steel material, the specification of the filter screen is 40~60 mesh.
4. the preprocess method that PU chemical leather DMF waste liquor rectifications as claimed in claim 2 are reclaimed, it is characterised in that step (4) In, the material of the hollow fiber film assembly is polypropylene screen, membrane aperture 0.2um, membrane flux 40L/m2h。
CN201710217979.1A 2017-04-05 2017-04-05 Preprocess method and its device that PU chemical leather DMF waste liquor rectifications are reclaimed Pending CN107098496A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110078285A (en) * 2019-05-08 2019-08-02 徐州工程学院 A kind of Urethane Elastic Fibre Industrial Wastewater efficient treatment process
CN110862132A (en) * 2019-11-27 2020-03-06 西安交通大学 Polyurethane-containing synthetic leather DMF wastewater solid-liquid separation process

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CN103623605A (en) * 2013-12-06 2014-03-12 浙江工业大学 Pretreatment method for rectifying and recovering dimethyl formamide (DMF) waste liquid of polyurethane (PU) synthetic leather
CN106277468A (en) * 2016-09-22 2017-01-04 武汉嘉讯源科技有限公司 A kind of method removing oils from high salinity DMF waste water

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Application publication date: 20170829