CN110330179A - Couple the advanced treating method of landfill leachate of nanofiltration concentrate humic acid extraction and application - Google Patents
Couple the advanced treating method of landfill leachate of nanofiltration concentrate humic acid extraction and application Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C02F2209/03—Pressure
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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Abstract
The invention discloses a kind of New-type refuse vehicle percolate deep treatment methods for coupling nanofiltration concentrate humic acid extraction and application, it is mainly by increasing the complete set technologys such as two-stage ultra filtration unit and gypsum crystallization unit newly, and the nano-filtration unit taped the latent power using advanced treating in percolate MBR+NF technique, constitute the novel advanced treatment process of percolate.Wherein, two-stage ultra filtration unit mainly acts to efficiently separate humic acid and inorganic salts in nanofiltration concentrate, and the final concentrate of gained is made to meet the index request as the raw material containing humic acid water-soluble fertilizer；Gypsum crystallization unit can reduce the concentration of calcium and sulfate ion in two-stage ultrafiltration system feeding liquid；And its nano-filtration unit by the tail water circulating reflux of generation into percolation liquid treating system, realize standard water discharge.This method is advanced, practical, economical, stable, easy to operate, and land occupation is few, without secondary pollution, and can realize resource circulation utilization.
Description
Technical field
The invention belongs to technical field of landfill leachate treatment, and in particular to a kind of coupling nanofiltration concentrate humic acid extraction
The New-type refuse vehicle percolate deep treatment method utilized.
Background technique
Landfill leachate is because of water quality processing complicated and changeable and extremely difficult, technical research and engineering practice by decades, mesh
Before, MBR+NF+RO group technology has become the prevailing technology of percolate processing, and wherein NF+RO is its advanced treatment process.In master
Under the conditions of the biological denitrificaion of body biological treatment link is operated normally and well functioned, if only considering that processing water outlet reaches
Situation is marked, then percolate is discharged after MBR can reach through NF unit comprehensively again, without again through protecting mainly as standard water discharge
Barrier and reuse RO unit, the investment and operating cost of RO unit can be cancelled in this way, it is often more important that can eliminate mainly according to
The RO concentrate solved by high cost desalination technology (such as evaporation technology).But NF unit also inevitably generates and accounts for stoste
The nanofiltration concentrate of volume 10 ~ 20% still lacks the contamination control technology of high-efficiency and economic at present, and therefore, percolate can not be complete
Amount processing.This has become the difficult point of pain spot and the relevant technologies research and development of puzzlement percolate processing enterprise and authorities at different levels
And hot spot.
Currently, the method or technique that carry out harmless treatment and the utilization of resources individually for nanofiltration concentrate have,
Such as authorize patent of invention " extracting method of humic acid " (ZL201110272483.7), " landfill leachate advanced treatment process and
Special equipment " (ZL102951741A) and " SO containing high concentration4 2-Landfill leachate MBR+NF concentrate in humic acid separate back
Knock off skill " (ZL201410633759.3) and application patent of invention be " in high concentration divalent salt ion percolate MBR+NF dope
Humic acid extracting method " (application number 201410689333.X) and " corruption in low concentration divalent salt ion percolate MBR+NF dope
Phytic acid extracting method " (application number 201710843650.6) etc. is provided in these patents and handles MBR+ independently of percolate
Nanofiltration system in NF technique outside advanced treating nano-filtration unit correspondingly needs to increase nanofiltration system investment, land occupation and process etc..
And if directly using nano-filtration unit in percolate treating process, since design is usually constructed with surplus, and can be simply by increasing
Operating pressure improves processing water or ability, therefore can satisfy the place that nanofiltration concentrate humic acid extraction system generates tail water
Load is managed to need.It is this to make full use of mode that there is superior technique economy, as nano-filtration unit effluent quality is more preferable, runs more
Stable, investment and operating cost are more low.But the nanofiltration concentrate being directly coupled with percolate mainstream treatment process
Harmless treatment and resource utilization method, i.e. the percolate advanced treatment process of coupling nanofiltration concentrate humic acid extraction and application are still
No, it thus needs to can be only achieved as nanofiltration concentrate harmless treatment facility is in addition separately provided in above-mentioned some patents
Percolate handles overall up to standard and contamination control.Therefore, it can be coupled in percolate disposed of in its entirety technique while realize that nanofiltration is dense
The utilization of resources of contracting liquid and percolate overall treatment deep treatment method up to standard will have apparent superiority and be widely applied
Prospect.
Summary of the invention
The purpose of the present invention is to provide a kind of New-type refuse vehicle percolates for coupling nanofiltration concentrate humic acid extraction and application
Deep treatment method by increasing the complete set technologys such as two-stage ultra filtration unit and gypsum crystallization unit newly, and taps the latent power and utilizes percolate
The nano-filtration unit of advanced treating in MBR+NF technique constitutes the novel advanced treatment process of percolate.This method is advanced, practical, warp
Ji, stable, easy to operate, land occupation is few, without secondary pollution, and can realize resource circulation utilization.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of New-type refuse vehicle percolate deep treatment method coupling nanofiltration concentrate humic acid extraction and application, it is characterised in that:
Include the following steps:
1) percolate MBR water outlet is pumped into nano-filtration unit, operating pressure is 0.5 ~ 1.5MPa, and cycles of concentration is 8 ~ 20 times, institute
It is the high monovalent ion transmitance nanofiltration membrane of antipollution with nanofiltration membrane, molecular cut off is 150 ~ 300Da, obtains nanofiltration permeate liquid
And nanofiltration concentrate；The COD concentration of gained nanofiltration concentrate reaches 2500mg/L or more, and gained nanofiltration permeate liquid is every through detection
Index is able to satisfy discharge standard limit value, can direct emission；Generated nanofiltration concentrate is pumped into level-one ultrafiltration system,
Its operating pressure is 0.6 ~ 2.5MPa, and cycles of concentration is 4 ~ 12 times, and ultrafiltration membrane used is the high desalination rate ultrafiltration membrane of antipollution, section
Staying molecular weight is 500 ~ 2500Da；Level-one ultra-filter retentate and level-one ultrafiltration permeate are obtained after UF membrane；Level-one ultrafiltration retention
The COD concentration of liquid reaches 20000mg/L or more；
2) the level-one ultra-filter retentate that step 1) obtains is pumped into two-stage ultrafiltering system, 0.5 ~ 2.0MPa of operating pressure, concentration
Multiple is 3 ~ 10 times, and ultrafiltration membrane used is the high desalination rate ultrafiltration membrane of antipollution, and molecular cut off is 1000 ~ 5000Da；Film point
Two-stage ultrafiltering trapped fluid and two-stage ultrafiltering permeate are obtained from after；Humic acid concentration in two-stage ultrafiltering trapped fluid is reached into 30g/L
More than, it can be used as the raw material of the fertilizer containing humic acid water-soluble；
3) the two-stage ultrafiltering permeate that step 2 obtains is pumped into gypsum crystallization system, makes the calcium ion wherein contained and sulfate radical
Ion 4 ~ 6h of crystalline deposit under the conditions of 25 ~ 40 DEG C, pH 1.8 ~ 3, obtains supernatant and sediment after mud-water separation；It will be upper
Clear liquid is recycled back to inflow level-one ultrafiltration system after filtering and re-starts separation concentration；It will be remaining dirty after sediment and MBR processing
Mud is carried out dehydrating and disposes together；
4) the resulting level-one ultrafiltration permeate circulating reflux of step 1) is entered in percolate processing nano-filtration unit, with percolate MBR
Water outlet is handled together.
Remarkable advantage of the invention is:
(1) nano-filtration unit processing capacity is generally near whole nanofiltration concentrate waters in existing patent of invention, so investing and accounting for
Ground is larger.The method of the present invention is taped the latent power using nano-filtration unit in percolate MBR+NF processing system, is eliminated in the prior art solely
It is vertical to build investment, land occupation required for nanofiltration system and process and its operation workload again, investment can be greatly reduced, saved the area
With the saving amount of labour.
(2) nanofiltration concentrate change of water quality is very big, general COD and conductivity can fluctuate respectively in 800 ~ 9500mg/L and 8 ~
It between 27ms/cm, therefore is currently to provide corresponding processing and resource utilization method for different quality nanofiltration concentrate, such as specially
Sharp " humic acid extracting method in high concentration divalent salt ion percolate MBR+NF film trapped fluid " (application number
201410689333.X) (apply with patent " humic acid extracting method in low concentration divalent salt ion percolate MBR+NF dope "
Number 201710843650.6) etc..The method of the present invention is due to including that (two-stage ultra filtration unit can efficiently separate full-featured each system
Humic acid and inorganic salts in nanofiltration concentrate, and two-stage ultrafiltering trapped fluid is made to can be used as the raw material containing humic acid water-soluble fertilizer；Stone
Cream crystalline element reduces calcium and sulfate ion concentration in two-stage ultrafiltration system feeding liquid, keeps the membranous systems such as ultrafiltration steady for a long time
Fixed operation；The nanofiltration concentrate humic acid that the two units are constituted extracts the tail water that integrated system generates and is circulated back to percolate
Nano-filtration unit in MBR+NF processing system, to realize whole standard water discharges), therefore it is suitable for the corruption of various nanofiltration concentrate water quality
The overall treatment of phytic acid extraction and application and percolate is up to standard.
(3) there is following insufficient or unreasonable place: " the extraction side of humic acid in some related invention patents existing at present
Nanofiltration permeate liquid will flow back into percolate MBR+NF processing system or through advanced oxidation in method " (ZL 201110272483.7)
After discharge, it is unreasonable；" SO containing high concentration4 2-Landfill leachate MBR+NF concentrate in humic acid process for separating and recovering " (ZL
201410633759.3) in use BaCl2Remove SO4 2-Ion and to sediment B aSO4Eluted, there are complex procedures,
Costly and labor safety risk etc.；" landfill leachate advanced treatment process and special equipment " (ZL 201210289032.9)
The concentrate that middle NF system generates takes back percolate processing biochemical system, and will cause membranous system flux reduces and occupy its processing energy
Power；" humic acid extracting method in low concentration divalent salt ion percolate MBR+NF film trapped fluid " (application number
201710843650.6) then point out that level-one ultrafiltration permeate needs again rear qualified discharge after further treatment in, but without clear
Specific processing method or technology；" humic acid extracting method in high concentration divalent salt ion percolate MBR+NF film trapped fluid " (Shen
Please number 201410689333.X) in NF concentrate need to after Fenton is handled, supernatant again with percolate MBR+NF Process for Effluent
Qualified discharge after mixing, this there are operation and maintenance it is complicated, at high cost and sludge quantity is big the disadvantages of.Therefore, compared with these patents,
The method of the present invention is advanced, practical, economical, stable, easy to operate, and land occupation is few, without secondary pollution, and can realize resources circulation
It utilizes.Percolate processing can reach the processing of nanofiltration concentrate full dose and the utilization of resources using deep treatment method of the present invention, and real
Existing percolate overall treatment is up to standard and contamination control, this will promote MBR+NF group technology generally answering in percolate processing
With, and further establish its dominant position.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
With reference to the accompanying drawing 1, to the New-type refuse vehicle percolate of coupling nanofiltration concentrate humic acid extraction and application of the invention
Advanced treatment process further describes.
General thought of the invention is illustrated first.The nanofiltration concentrate generated at present for percolate MBR+NF technique
Harmless treatment and utilization of resources technique or method, be substantially all containing receiving outside independently of percolate processing MBR+NF technique
Filter system, to ensure that nanofiltration concentrate harmless treatment and utilization of resources technique tail water can be up to standard, and the nanofiltration system and infiltration
Nano-filtration unit is essentially identical in filtrate processing MBR+NF technique, it can be considered to save the nanofiltration system, directly using diafiltration
Nano-filtration unit realizes the purpose in liquor treating process, is formed the deep treatment method of percolate of the present invention.
Particular technique of the present invention improvement is shown: (1) it taps the latent power using nano-filtration unit in percolate processing MBR+NF technique, one
As design when the nano-filtration unit have certain surplus, be obtained with reception nanofiltration concentrate by properly increasing operating pressure
The tail water processing capacity (be usually no more than percolate treatment scale 20%) that processing and utilization of resources technique generate.It does so not
Investment needed for only saving newly-increased nanofiltration system, land occupation and operation element amount, and for the nano-filtration unit, feed water quality
Vary less, and if increase independent nanofiltration system newly, charging water quality is compared to obviously can be poor, therefore, directly uses the nanofiltration
Unit can obtain better effluent quality, can more ensure qualified discharge.(2) realize in nanofiltration concentrate have by two-stage ultrafiltration
Machine object (humic acid) and inorganic salts efficiently separate, and obtain the raw material containing humic acid water-soluble fertilizer for meeting relevant criterion requirement, and
The extraction humic acid technique tail water for forming water quality good (organic matter and inorganic salt content are lower) is circulated back to percolate processing
Nano-filtration unit in MBR+NF technique will not generate its influent quality and significantly affect.(3) in order to regulate and control extract humic acid process
In divalent ion concentration in the charging of each membranous system, to ensure that each membranous system can be run steadily in the long term, using gypsum crystallization system come
Calcium and sulfate ion concentration is effectively reduced, avoids the formation of high film two sides osmotic pressure, causes membrane flux too low and lose engineering
Calcium and sulfate ion concentration are in film surface precipitation gypsum crystal in use value or the charging of excessively high film, to cause to film
Irreversible membrane fouling and even damage film.
The novel deep treatment method of landfill leachate of coupling nanofiltration concentrate humic acid extraction and application of the present invention
Technical parameter:
1, level-one ultrafiltration system
0.6 ~ 2.5Mpa of operating pressure,
4 ~ 12 times of cycles of concentration,
500 ~ 2500Da of molecular cut off,
COD >20000mg/L；
2, two-stage ultrafiltering system
0.5 ~ 2.0MPa of operating pressure,
3 ~ 10 times of cycles of concentration,
1000 ~ 5000Da of molecular cut off,
Humic acid >=30g/L；
3, calcium and sulfate ion gypsum crystallization system
25 ~ 40 DEG C of reaction temperature,
PH 1.8 ~ 3 is reacted,
4 ~ 6h of reaction time；
4, nano-filtration unit in percolation liquid treating system
0.5 ~ 1.5Mpa of operating pressure,
8 ~ 20 times of cycles of concentration,
150 ~ 300Da of molecular cut off,
COD >2500mg/L。
Embodiment 1
Below with the landfill leachate of the coupling nanofiltration concentrate humic acid extraction and application to certain consumer waste infiltration liquid treatment plant
For advanced treating, the present invention is further illustrated.
Consumer waste infiltration liquid treatment plant process object is that refuse landfill mixes percolate with incineration plant, and percolate is total
Water is 2100 ton per days, and generating sanitary filling field and garbage incinerating power plant day percolate is respectively 1700 tons and 400 tons, two
Class percolate is mixed in a certain ratio after collecting respectively in balancing tank.The percolate body processing system is MBR+NF technique, out
Water stably reaches discharge standard.The nanofiltration concentrate that the percolate treatment plant generates directly can be lifted into level-one ultrafiltration system by pump
System, the molecular cut off of level-one ultrafiltration membrane are 500 ~ 2500Da, and operation pressure difference is 0.8 ~ 1.5Mpa, and cycles of concentration is 4 ~ 7 times, film
Separation rear stage ultra-filter retentate COD is 20000 ~ 30000mg/L, and conductivity is 15 ~ 25mS/cm, and humic acid concentration is about
13000 ~ 22000mg/L, color darkly bronzing；Level-one ultrafiltration permeate COD is 1000 ~ 1800mg/L, conductivity 12-
23mS/cm, color be it is faint yellow, flow back into the MBR discharge bay of percolation liquid treating system.Level-one ultra-filter retentate continues to be pumped into two
Grade ultrafiltration system, the molecular cut off of ultrafiltration membrane are 1000 ~ 5000Da, and operation pressure difference is 0.5 ~ 1.0Mpa, and cycles of concentration is 3 ~ 7
Times, two-stage ultrafiltering trapped fluid COD reaches 65000 ~ 80000mg/L after UF membrane, and conductivity is 18 ~ 28mS/cm, humic acid concentration
About 30000 ~ 45000mg/L, color are in black, show that humic acid content has met water containing humic acid in two-stage ultrafiltering trapped fluid
Molten fertilizer product can be used as the raw material containing humic acid water-soluble fertilizer to the index request of humic acid.Two-stage ultrafiltering permeate is transparent,
In yellowish-brown, gypsum crystallization system is flowed into, maintains 25 ~ 40 DEG C of temperature, the pH for adjusting reaction material liquid is 1.8 ~ 3, makes calcium and sulfuric acid
Radical ion reacts 4 ~ 6h；The supernatant that calcium and sulfate ion concentration substantially reduce after reaction passes back into level-one after further filtering
Ultrafiltration system separates concentration again；Sediment is discharged into sludge-tank, then mixes and take off together in the excess sludge of percolation liquid treating system
Water process disposition.Through level-one ultrafiltration system of the present invention level-one ultrafiltration permeate obtained after separation and percolate processing system
The nano-filtration unit for being pumped into percolation liquid treating system as feeding liquid after the MBR water outlet mixing of system is handled together.
Wherein, compared with traditional percolate handles MBR+NF technique, the operation ginseng of nano-filtration unit in processing method of the present invention
Number is changed, and is generally 5 ~ 6 times by the volume concentration multiple of nano-filtration unit in traditional handicraft and is increased to 9 ~ 15 times, operation pressure
Power is increased to 0.5 ~ 0.9MPa by 0.3 ~ 0.6MPa, and nanofiltration concentrate COD is also increased to 2500 by 1000 ~ 3000mg/L ~
6000mg/L, color are in brown color；But after nano-filtration unit is mixed by percolation liquid treating system MBR water outlet and level-one ultrafiltration permeate
Feeding liquid change of water quality it is little, if COD increases only about 10 ~ 30%, with guarantee nanofiltration water outlet (permeate) can be up to standard.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (5)
1. a kind of New-type refuse vehicle percolate deep treatment method for coupling nanofiltration concentrate humic acid extraction and application, feature exist
In: include the following steps:
1) percolate MBR water outlet is pumped into nano-filtration unit, obtains nanofiltration permeate liquid and nanofiltration concentrate；Gained nanofiltration permeate liquid reaches
Mark discharge；Generated nanofiltration concentrate is pumped into level-one ultrafiltration system, level-one ultra-filter retentate and level-one are obtained after UF membrane
Ultrafiltration permeate；
2) the level-one ultra-filter retentate that step 1) obtains is pumped into two-stage ultrafiltering system, two-stage ultrafiltering trapped fluid is obtained after UF membrane
With two-stage ultrafiltering permeate；Two-stage ultrafiltering trapped fluid is used as to the raw material of the fertilizer containing humic acid water-soluble；
3) the two-stage ultrafiltering permeate that step 2 obtains is pumped into gypsum crystallization system, is obtained after crystallized precipitating, mud-water separation
Supernatant and sediment；Supernatant is recycled back to inflow level-one ultrafiltration system and re-starts separation concentration；At sediment and MBR
The excess sludge that reason generates is carried out dehydrating and disposes together；
4) the resulting level-one ultrafiltration permeate circulating reflux of step 1) is entered in percolate processing nano-filtration unit, with percolate MBR
Water outlet is handled together.
2. the New-type refuse vehicle percolate advanced treating of coupling nanofiltration concentrate humic acid extraction and application according to claim 1
Method, it is characterised in that: the operating pressure of nano-filtration unit described in step 1) is 0.5 ~ 1.5MPa, and cycles of concentration is 8 ~ 20 times, institute
It is 150 ~ 300Da with the molecular cut off of nanofiltration membrane.
3. the New-type refuse vehicle percolate advanced treating of coupling nanofiltration concentrate humic acid extraction and application according to claim 1
Method, it is characterised in that: the operating pressure of level-one ultrafiltration system described in step 1) is 0.6 ~ 2.5MPa, and cycles of concentration is 4 ~ 12
Times, the molecular cut off of ultrafiltration membrane used is 500 ~ 2500Da.
4. the New-type refuse vehicle percolate advanced treating of coupling nanofiltration concentrate humic acid extraction and application according to claim 1
Method, it is characterised in that: 0.5 ~ 2.0MPa of operating pressure of two-stage ultrafiltering system described in step 2, cycles of concentration are 3 ~ 10 times,
The molecular cut off of ultrafiltration membrane used is 1000 ~ 5000Da.
5. the New-type refuse vehicle percolate advanced treating of coupling nanofiltration concentrate humic acid extraction and application according to claim 1
Method, it is characterised in that: the reaction temperature of crystalline deposit described in step 3) is 25 ~ 40 DEG C, and reaction material liquid pH is 1.8 ~ 3, reaction
Time is 4 ~ 6h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111072433A (en) * | 2020-01-22 | 2020-04-28 | 福州大学 | Method for purifying sodium chloride in humic acid liquid fertilizer |
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| CN1648075A (en) * | 2004-12-17 | 2005-08-03 | 清华大学 | Resource process for percolation liquid of city life garbage landfill |
| CN104418456A (en) * | 2013-09-08 | 2015-03-18 | 蒋华 | Method for recycling household refuse landfill leachate |
| CN109485189A (en) * | 2017-09-10 | 2019-03-19 | 福州其然环保科技有限公司 | Ca in high concentration chaff interferent waste water2+And SO42-Intermediate processing |
| CN109516844A (en) * | 2017-09-19 | 2019-03-26 | 福州其然环保科技有限公司 | Humic acid extracting method in low concentration divalent ion percolate MBR+NF dope |
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| CN111072433A (en) * | 2020-01-22 | 2020-04-28 | 福州大学 | Method for purifying sodium chloride in humic acid liquid fertilizer |
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