CN108275853A - A kind of heavy metal pollution high speed dewatering of slurries system and its method for heavy metal pollution high speed dewatering of slurries - Google Patents
A kind of heavy metal pollution high speed dewatering of slurries system and its method for heavy metal pollution high speed dewatering of slurries Download PDFInfo
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- CN108275853A CN108275853A CN201810041085.6A CN201810041085A CN108275853A CN 108275853 A CN108275853 A CN 108275853A CN 201810041085 A CN201810041085 A CN 201810041085A CN 108275853 A CN108275853 A CN 108275853A
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- sludge
- heavy metal
- dewatering
- high speed
- slurries
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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
- C02F11/00—Treatment of sludge; Devices therefor
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention discloses a kind of heavy metal pollution high speed dewatering of slurries system and its for the method for heavy metal pollution high speed dewatering of slurries, dewatering system includes sludge scratch pool, ultrasonic response device, flocculation reaction device and sludge dehydration device；The method for using it for heavy metal pollution slurry dewatering is：It after heavy metal sewage sludge carries out pH adjustings in sludge scratch pool, delivers into ultrasonic response device after being ultrasonically treated, enters back into flocculation reaction device and carry out flocculation reaction, finally enter in the geotextile tube bag of dehydration device and carry out mud-water separation；Entire dewatering system is short to heavy metal sewage sludge process cycle, and flocculant usage is few, can realize that the stabilization processes of heavy metal, dewatered sludge can directly carry out final disposal or recycling while sludge dewatering.
Description
Technical field
The present invention relates to the stabilisation of heavy metal sewage sludge, minimizing processing methods, more particularly to ultrasonic pretreatment, flocculation
Processing combine geotextile tube bag dehydration be combined realize heavy metal sewage sludge rapid stabilization, minimizing method, belong to a huge sum of money
Belong to technical field of sludge treatment.
Background technology
In recent years, as the quickening of process of industrialization, especially China's industry manufacture and mineral products are mined and refined the raising of ability, by
This plurality of heavy metal waste water generated and waste residue etc. are unprocessed to be directly discharged in environment so that heavy metal pollution problem day
Benefit is prominent.Combine publication with Ministry of Land and Resources according to Environmental Protection Department in 2014《National Investigation of Soil Pollution bulletin》It has been shown that,
National soil environment situation totally allows of no optimist, and some areas soil pollution is heavier, and arable soil environmental quality causes anxiety, industry and mining
Discarded ground soil environment outstanding problem.Heavy metal pollution of soil has constituted seriously ecological environment, food security and health
It threatens.
Currently, heavy-metal contaminated soil restorative procedure mainly has engineering technology (heavy metal pollution of soil, soil replacement method and deep plowing method),
(phytoremediation and microorganism are repaiied for physical-chemical process (electric driving method, electrothermal way and elution method), solidification and stabilization method and biological restoration
It is multiple), wherein Soil leaching recovery technique is simple for process, and repairing effect is stable, thorough, and the period is short, expense relative moderate, and right
The remediation efficiency of high density pollution soil is high, is increasingly paid attention to by researcher, at home and abroad has many ripe answer
Use case.But a large amount of elution mud is often will produce in Soil leaching repair process, these elution mud contain heavy metal, right
Environment is harmful, and can efficiently, economically dispose elution mud be a great problem that Soil leaching recovery technique promotes and applies.
It is to use flocculant combination geotextile tube bag to dirt that elution mud conditioning is carried out in the prior art than more conventional method
Mud is carried out dehydrating, and this method treating capacity is big, easy to operate, of low cost, but its long processing period, and flocculant usage
Greatly, processing cost is higher.In order to which the method flocculant usage for solving traditional is big, the problem of period length, currently, having been reported that using wadding
The method that solidifying agent combination ultrasonication carries out sludge dewatering, as Chinese patent (102120682 A of Publication No. CN) discloses one
Ultrasonic wave auxiliary sludge dewatering system is planted, includes using step：Sludge is through slush pump or river lake and reservoir bed mud through environmental dredging
Ship is transported to the mixer being connected in sealing pipeline, and flocculant is added by sludge of the metering pump into mixer, wadding is added
Sludge after solidifying agent is sent into geotextile tube bag dewatering and coagulating after supersound process.This method is added in sludge pipeline transportational process
It is ultrasonically treated unit, promotes flocculating effect, reduces flocculant usage, shortens the geotextile tube bag dewatering and coagulating time, this novel ultrasonic
Auxiliary sludge dewatering system can operate continuously, and treating capacity is big, efficient, can reach good economic benefit.It is mainly sharp
Promote flocculant dispersion with ultrasonic wave, have a facilitation to coagulation, while utilizing the flocculent structure of ultrasonic destruction sludge and molten
Micelle structure has disintegrated the extracellular polymeric cell on mud granule surface, so that the combination water in sludge is become Free water and releases
Come, so as to improve dehydration efficiency.But there is also following substantial limitations in actual process for this method：1) it is used
High intensity, it is prolonged be ultrasonically treated, sludge floc particle and zoogloea structure can be destroyed completely, so that the sludge grain size is decreased to
More than ten micron orders, mud granule specific surface area increase, and are improved to the adsorption capacity of water, are unfavorable for intergranular compression, drop instead
The low dewatering of sludge, and processing cost is high.2) heavy metal in sludge cannot effectively be handled, it is dewatered
Sludge and filtrate also need to further dispose.3) pH value of sludge, temperature etc. have a certain impact to ultrasonic wave disintegration effect.4)
Using processing sequence ultrasonic after first flocculating, adsorbance of the flocculant to mud granule can be reduced, reduces dehydrating effect, and to
Flocculated sludge is ultrasonically treated, and flocculation structure can be destroyed, and influences sludge dewatering property, deteriorates supernatant water quality.5) geotechnological
In pipe bag dehydration, only relies on gravity and pumping pressure realizes that mud-water separation, spin cycle are long.
Invention content
In view of the drawbacks of the prior art, first purpose of the invention is to be that provide one kind stablizes for heavy metal sewage sludge
The dewatering system of processing and high-efficiency dehydration volume reduction, the dewatering system not only ensure not generating the secondary dirt of heavy metal in dehydration
Dye, and equipment one-time investment is few, simple for process, and low energy consumption for processing procedure, and dewatered sludge heavy-metal leaches content energy
Enough meet the requirement that sludge is subsequently disposed.
Another object of the present invention be to provide it is a kind of fast for heavy metal pollution mud based on the dewatering system
The method of speed dehydration, this method do not generate heavy metal secondary pollution, and equipment investment in the process of guarantee heavy metal high-efficiency dehydration
Few, processing cost is low, is conducive to promote and apply.
In order to achieve the above technical purposes, the present invention provides a kind of heavy metal pollution high speed dewatering of slurries systems, by dirt
Mud scratch pool, ultrasonic response device, flocculation reaction device and sludge dehydration device are sequentially connected composition；The ultrasonic response
Device includes supersonic generator and reactive tank；The flocculation reaction device includes flocculation tank, in the flocculation tank
Flocculation tank is separated into inorganic flocculating agent reaction zone and organic flocculant reaction zone, the training wall bottom by portion equipped with training wall
Portion is equipped with opening, and inorganic flocculating agent reaction zone is made to be connected to organic flocculant reaction zone bottom；The inorganic flocculating agent reaction zone
Equipped with inorganic flocculating agent throwing device and agitating device；The organic flocculant reaction zone be equipped with organic flocculant throwing device and
Agitating device；The sludge dehydration device includes waterproof substrate, outer frame body and geotextile tube bag；The outer frame body is fixed at
In waterproof substrate, the geotextile tube bag is fixed inside outer frame body.
Preferred scheme, the sludge scratch pool are being internally provided with agitating device and are being provided at an outer portion with basic agent addition
Device.The sludge scratch pool is round reaction tank, and top is equipped with mud inlet and basic agent adding set, is internally provided with stirring
Device, lower part are equipped with mud mouth.It is more uniform that the sludge scratch pool can be such that medicament and sludge mixes, and effect is good, efficient and not
Stay dead angle.
Preferred scheme, the supersonic generator include signal generator, energy converter and the combination of ultrasonic probe external member；
In the ultrasonic probe intercalation reaction slot；One end top of the reactive tank is equipped with mud inlet, and other end lower part is equipped with mud extraction
Mouthful.Ultrasonic response device acoustic energy utilization rate is big, and quite high ultrasonic power density is can get in sludge；Power continuously may be used
It adjusts, can find and determine best ultrasound wave irradiation condition within the scope of larger power density.
The pool wall top of preferred scheme, the inorganic flocculating agent reaction zone is equipped with enters mud pipe；The organic flocculant is anti-
The pool wall top in area is answered to be equipped with sludge out pipe.Flocculation reaction device is separated into two reaction zones by a training wall, sludge first with it is inorganic
Flocculant reacts, and forms flco, then reacts to form bulky grain with organic flocculant, accelerates mud granule sedimentation, improves sludge
Dewatering.
Preferred scheme, the waterproof substrate are equipped with a rectangular recess, and the quadrangle outer edge of rectangular recess is equipped with
Hole, is step double-layer structure inside rectangular recess, the lower layer of step double-layer structure be equipped with composite earthwork drainage network and
Equipped with drainpipe；The outer frame body is by four support columns, several straight-flanked rings and four block lengths are rectangular that drain bar is helped to constitute；Described four pieces
Rectangle helps drain bar to be spliced into hollow rectangular parallelepiped structure, is consolidated by several upper and lower parallel straight-flanked rings outside hollow rectangular parallelepiped structure
Fixed, the quadrangle of each straight-flanked ring is respectively fixedly disposed on four support columns；It is recessed that four support columns of the outer frame body are inserted into rectangle
Fixation of the outer frame body in waterproof substrate is realized in the outer peripheral hole in slot quadrangle；The rectangular row of helping of four block lengths of the outer frame body
Water board bottom portion is fixed at the upper layer of step double-layer structure.The composite earthwork drainage network being laid in sludge dehydration device,
Drainage is strong, can bear higher compression load during entire use, laying depth can according to applicable cases into
Row is adjusted, it can be ensured that hydraulic conductivity steady in a long-term, alternative traditional gravel drainage blanket is easy for construction, at low cost.Outer frame body
Rectangle help drain bar that there is vertical ripple, moisture that can be quickly by the exudation of geotextile tube bag side wall is discharged to pipe bag, adds
Consolidation of the fast sludge in pipe bag shortens spin cycle.
Preferred scheme, the outer frame body top are equipped with the mechanical clamp for fixing geotextile tube bag.
More preferably scheme helps the medial surface of drain bar to be equipped with vertical ripple.
The present invention also provides a kind of methods that dewatering system is used for heavy metal pollution high speed dewatering of slurries comprising
Following steps：
1) heavy metal sewage sludge in sludge scratch pool adjusts pH to 7~10；
2) heavy metal sewage sludge in sludge scratch pool is pumped into ultrasonic response device, carries out ultrasonication；It is described super
The frequency of sound wave is 25~30kHz, and acoustic density is 0.05~0.15W/mL, and ultrasonic treatment time is not more than 10s；
3) heavy metal sewage sludge in ultrasonic response device is pumped into flocculation reaction device, carries out inorganic flocculation treatment successively
With organic-flocculation processing；
4) heavy metal sewage sludge in flocculation reaction device, which is pumped into dehydration device, carries out mud-water separation.
Preferred scheme, the inorganic flocculating agent that the inorganic flocculation treatment uses are sub- for bodied ferric sulfate, iron chloride, sulfuric acid
At least one of iron；The organic flocculant that the organic-flocculation processing uses is poly- for cationic-type polyacrylamide or anionic
Acrylamide；Wherein, the addition of inorganic flocculating agent is the 2%~10% of sludge quality；The addition of organic flocculant is dirt
The 2 ‰ of shale amount~5 ‰, sludge quality are measured with butt sludge.Preferred flocculant is with sludge flocculation conditioning functions and again
Metal-stabilized function.
Preferred scheme, the heavy metal sewage sludge include at least one of cadmium, mercury, arsenic, copper, lead, chromium, zinc, nickel heavy metal
Ion.
The solid masses concentration of preferred scheme, heavy metal sewage sludge is no more than 100.0g/L.
Preferred scheme, residence time of the heavy metal sewage sludge in flocculation reaction device are 5~10min.
Preferred scheme, sludge scratch pool add pH conditioners, such as lime by basic agent adding set.
Preferred scheme, the organic flocculant reaction zone and inorganic flocculating agent reaction zone of the flocculation reaction device are interior respectively
Equipped with one or more groups of agitating devices.
Preferred scheme, waterproof substrate are concrete structure.
Preferred scheme between support column and straight-flanked ring, straight-flanked ring and helps between drain bar, and helps drain bar and the row of helping
Connection type between water plate is welding.
Geotextile tube bag during the installation process, geotextile tube bag is sling, makes it by outer frame body in technical scheme of the present invention
Portion is fallen in a manner of hanging down naturally, is positioned over that soil engineering drainage is online, and the mechanical clamp of outer frame body upper part of the supporting column is used in combination to fix
Geotextile tube bag.
Preferred scheme, it is the woven of raw material or the rectangular knot manually worked out that geotextile tube bag, which is by polypropylene or polyester,
Structure body.
Technical scheme of the present invention is directed to heavy metal pollution mud, first the pH value of addition basic agent conditioning of mud to alkali
Property, it is then conveyed into ultrasonic response device by slush pump, flocculation reaction device is entered after sonicated, to
Sludge adds a certain proportion of inorganic and organic flocculant, and the sludge after flocculation reaction is finally pumped into dehydration device
Geotextile tube bag, geotextile tube bag be filled with after 7~15 days, moisture percentage in sewage sludge be less than 65%.
Sludge dehydration device can be single or multiple used in parallel in technical scheme of the present invention.
Compared with the prior art, the advantageous effects that technical scheme of the present invention is brought：
1. the present patent application technical solution, key is first to heavy metal sewage sludge progress short time ultrasonication, then into
Row flocculation sediment, the method being then sonicated of first flocculating in relatively existing technology have following clear superiority：1) flocculation
Mainly granular absorption is assembled and is easy to detach simultaneously rapid subsidence with water as bulky grain.If the first dirt to having flocculated
The bulky grain being gathered into can be broken up using ultrasonication and become loose by mud, deteriorate the dewatering of sludge instead, unfavorable
In raising dehydrating effect.Flocculation simultaneously is difficult at its heavy metal dissolution of the sludge after bulky grain, it is difficult to realize in heavy metal sewage sludge
The dissolution of heavy metal and stabilization processes.And in technical solution of the present invention under alkaline condition, first heavy metal sewage sludge is carried out short
Time is ultrasonically treated, and sludge bulky grain is broken, and the moisture of absorption is transformed into free state, while heavy metal ion is dissociated to water
In, it is complexed by alkali, flocculant is added on this basis, dewatering performance of sludge can be improved in various degree, sludge settling is fast, and mud cake contains
Water rate is low, and heavy metal is stabilized.If 2) first pass through flocculation treatment, then it is ultrasonically treated, due in flocculation process
The supernatant suspended matter and colloidal substance of sludge are less, after some strength ul-trasonic irradiation, the colloidal sol that will adsorb
Plasma diffusing W,Mo comes out, and causes the moisture turbidity that geotextile tube bag is deviate from big.And the sludge of technical solution of the present invention first pass through it is appropriate
After ultrasonication, a certain size is broken by the high shear power that ultrasonic cavitation generates so that Interstitial Water therein and portion
Divide and be released in conjunction with water, then via flocculation, the colloid being released or extracellular polymeric absorption can be wrapped up,
To which the moisture turbidity of geotextile tube bag abjection is low.3) according to selective flocculation theory, there are adsorption energy to mud granule for flocculant
Force difference is different, and a considerable amount of mud granules can be caused to be ostracised except flocculation process.Technical solution of the present invention first passes through ultrasound
Processing changes original existing forms of mud granule, enhances its physico-chemical property consistency, will increase flocculant to mud granule
Total amount is adsorbed, flocculation separation effect is improved, reduces the dosage of flocculant.
2. the present invention heavy metal pollution high speed dewatering of slurries system mainly by sludge scratch pool, ultrasonic response device,
Flocculation reaction device and four part of sludge dehydration device are constituted, and realize be adjusted to alkalinity to the pH of heavy metal sewage sludge successively, then surpass
Sonication destroys sludge flco, zoogloea and cell body, reduces the combined water of sludge, promotes Metal ion release, using
Inorganic-organic flocculation sediment greatly improves the flocculation of metal ion and sludge, reduces flocculant usage amount, is filtered
The flocculate of better performances, is conducive to subsequent geotextile tube bag dehydration, which not only may be implemented heavy metal sewage sludge
High-efficiency dehydration, and can effectively realize the stabilization processes of heavy metal, prevent the secondary pollution of heavy metal, and process cycle
It is short, mud handling capacity is big, dehydration efficiency is high, at low cost, can not only handle the elution mud of heavy-metal contaminated soil, can be with
Treated sewage plant excess sludge can also handle the river,lake and reservior bed mud of heavy metal pollution.
3. the technical scheme is that enhancing ultrasonic wave pre-processes sludge, adds to the opsonic action of sludge
Add lime to adjust pH to alkalinity, on the one hand builds alkaline environment, be conducive to the formation of hydroxyl radical free radical, enhance cavitation；It is another
Aspect improves sludge temperature, promotes the dissolution of flco disintegration and organic matter, is conducive to ultrasonic disintegration；In addition, heavy metal ion and hydrogen
Oxygen root knot, which is closed, generates precipitation, and heavy metal is made to be converted to stable state.
4. technical scheme of the present invention during flocculation reaction, first uses bodied ferric sulfate, iron chloride, ferrous sulfate etc.
Inorganic flocculating agent carries out flocculation treatment, then using organic-flocculations such as cationic-type polyacrylamide or cationic-type polyacrylamides
Agent carries out flocculation treatment.Colloidal solid in sludge takes off surely under the action of inorganic flocculating agent, forms floccule firm in structure,
Polar group that these floccules are attracted to again on organic flocculant strand and form big flco, accelerate mud granule
Sedimentation, enhances sludge dewatering effect, and reduce dosing.
5. technical scheme of the present invention in sludge dehydration process by medial surface it is ripply help drain bar improve row
Water effect can effectively improve the longitudinal drainage ability of dehydration device, can rapidly collect the moisture that geotextile tube bag side wall is discharged
It is discharged to bottom, reduces excess hydrostatic pressure inside geotextile tube bag, keep mud rapidly solidified, shorten spin cycle.
Description of the drawings
【Fig. 1】For a kind of sludge containing heavy metal rapid dewatering system schematic diagram；
【Fig. 2】For the sectional view of sludge dehydration device；
【Fig. 3】For the stereogram of sludge dehydration device；
Wherein, 1- sludge scratch pool；2- basic agent adding sets；3- signal generators；4- energy converters；5- ultrasonic waves are visited
Head；6- reactive tanks；7- mud inlets；8- mud mouths；9- inorganic flocculating agent adding sets；10- inorganic flocculating agent reaction zones；11- is stirred
Mix device；12- organic flocculant adding sets；13- organic flocculant reaction zones；14- training walls；15- sludge dehydration devices；
The waterproof matrixes of 150-；151- support columns；152- straight-flanked rings；153- rectangles help drain bar；154- composite drainage networks；155- soil
Work pipe bag；156- mechanical clamps；157- drainpipes；16- sludge pumps.
Specific implementation mode
Following embodiment is intended to further illustrate the content of present invention, rather than limits the protection model of the claims in the present invention
It encloses.
The present invention is a kind of rapid dewatering system of sludge containing heavy metal such as Fig. 1, heavy metal pollution high speed dewatering of slurries system
System, main body are sequentially connected and are constituted by sludge scratch pool, ultrasonic response device, flocculation reaction device and sludge dehydration device, respectively
Conveyance conduit and stock pump are equipped between component part.Sludge scratch pool is round reaction tank, and top is equipped with mud inlet and alkali
Property medicament adding device, is internally provided with agitating device, agitating device can be arranged it is multigroup, it is true according to sludge scratch pool size
Fixed, its underpart is equipped with mud mouth, and mud mouth is connect by conveyance conduit with the mud inlet of ultrasonic response device.The ultrasonic wave
Reaction unit includes supersonic generator and reactive tank；The supersonic generator includes signal generator, energy converter and ultrasound
External member of wave popping one's head in combines；In the ultrasonic probe intercalation reaction slot, one end top of the reactive tank is equipped with mud inlet, another
Lower part is held to be equipped with mud mouth, the mud mouth of reactive tank is connected by the enters mud pipe of conveyance conduit and flocculation reaction device.Flocculation is anti-
It includes flocculation tank to answer device, and flocculation tank is separated into inorganic flocculating agent equipped with training wall in the middle part of the flocculation tank
Reaction zone and organic flocculant reaction zone, the training wall bottom are equipped with opening, make inorganic flocculating agent reaction zone and organic-flocculation
Agent reaction zone bottom is connected to；The inorganic flocculating agent reaction zone is equipped with inorganic flocculating agent throwing device, agitating device, agitating device
Can be multigroup, the pool wall top of inorganic flocculating agent reaction zone is equipped with enters mud pipe；The organic flocculant reaction zone is equipped with organic
Flocculating agent feeding device and agitating device, agitating device can be multigroup, and the pool wall top of organic flocculant reaction zone is equipped with out
Mud pipe, sludge out pipe are connect by conveyance conduit with sludge dehydration device.Sludge dehydration device main body includes waterproof substrate, outline border
Body and geotextile tube bag.The waterproof substrate is the concrete structure of rectangle, which is provided with a rectangular recess, the four of rectangular recess
Angle outer edge is all provided with hole, is step double-layer structure inside rectangular recess, and the lower layer of step double-layer structure is equipped with again
It closes earthwork water drain net and is equipped with drainpipe.The outer frame body is by four support columns, several straight-flanked rings and four block lengths are rectangular helps draining
Plate is fixedly connected with composition by welding manner；Four block length is rectangular to help drain bar to be spliced into hollow rectangular parallelepiped structure, hollow length
It is fixed by several upper and lower parallel straight-flanked rings outside cube structure, the quadrangle of each straight-flanked ring is respectively fixedly disposed at four support columns
On；The medial surface for helping drain bar is equipped with vertical ripple, to improve transverse drainage rate.Four support columns of the outer frame body
It is inserted into the outer peripheral hole in rectangular recess quadrangle and realizes fixation of the outer frame body in waterproof substrate.Four pieces of the outer frame body
Rectangle helps drain bar bottom to be fixed at the upper layer of step double-layer structure.It is equipped at the top of the outer frame body for fixed soil
The mechanical clamp of work pipe bag, geotextile tube bag sack are fixed at the top of outer frame body, and geotextile tube bag bag body pendant is inside outer frame body.Soil
It is the woven of raw material or the square structure body manually worked out that work pipe bag, which is by polypropylene or polyester,.
The operating procedure of the system includes：
1. the heavy metal sewage sludge first in sludge scratch pool 1 to moisture content more than 90% carries out pH adjustings, make its pH value
Between 7~9.Then the heavy metal sewage sludge after conditioning is transported in ultrasonic response device with sludge pump.
2. mud enters from the mud inlet 7 of the reactive tank 6 of ultrasonic response device, through frequency range in 25~30kHz, sound
The ul-trasonic irradiation that energy density is about 0.05~0.15W/mL is less than 10s, is flowed out from mud mouth 8, into flocculation reaction device.
3. flocculation reaction device front is inorganic flocculating agent reaction zone 10, by inorganic flocculating agent adding set 9 to sludge
Middle addition inorganic flocculating agent simultaneously carries out mechanical agitation (100~150r/min), and additive amount is about the 2~10% of sludge quality, is made
Sludge forms flco, and sludge enters organic flocculant reaction zone 13 by 14 bottom of training wall later, is added by organic flocculant
Feeder apparatus 12 adds organic flocculant into sludge and carries out mechanical agitation (100~150r/min), and additive amount is about sludge matter
2~the 5 ‰ of amount.Residence time of the sludge in flocculant reaction unit is 5~10min, by the sludge pumping after flocculation reaction
Into sludge dehydration device.
4. after geotextile tube bag 155 is fixed with fixture 156, sludge is injected from 155 top of geotextile tube bag, until being full of
Entire pipe bag.With the increase of injection mud amount, the pressure inside pipe bag gradually increases.Moisture content in sludge is in gravity and surrounding
It is oozed out from geotextile tube bag under helping the pressure of drain bar 153 to act on, then by helping longitudinal ripple and the bottom of drain bar 153
Composite drainage network 154 collects, then through arranging and being handled outside drainpipe 157.Moisture content after sludge consolidates 7 days in dehydration device
60% or less can be reduced to.
5. after moisture percentage in sewage sludge reaches requirement, fixture 156 is unclamped, geotextile tube bag is sealed.It will be propped up with mechanical implement
Frame and drain bar is helped to pull up, disengages it from basal layer and geotextile tube bag.Then geotextile tube bag is moved from basal layer with mechanical implement
The step of removing, then holder be installed into basal layer, reloading geotextile tube bag, repeat sludge dewatering.
Embodiment 1
Heavy-metal contaminated soil is left in chemical plant using the mud generated after elution method processing, moisture content in Hengyang City
98%, the heavy metal for eluting to get off from soil, predominantly cadmium (Cd), lead (Pb), zinc (Zn), arsenic (As) are enriched in mud.
Lime is added in sludge scratch pool and adjusts pH to 9, mud is then sent into ultrasonic response device, supersonic generator does not open
Dynamic (not applying ultrasonication), is then pumped into flocculation reaction device, flocculation basin add respectively 10% bodied ferric sulfate with
The cationic-type polyacrylamide of 5 ‰ (mass ratio, mud dry weights), is pumped into after stirring evenly in sludge dehydration device, geotextile tube
Bag stops filling after being filled with, and after the moisture outflow in sludge, is continued to fill up after the slot milling of geotextile tube bag top, repetition is filled out
4~6 times are filled to being fully filled with.Mud dewatering and coagulating 10 days in geotextile tube bag, moisture content average out to 62%.
Embodiment 2
Implementation opens supersonic generator, through frequency range in 28kHz, acoustic density 0.1W/ with embodiment 1
The ul-trasonic irradiation 6s of mL.Change the sun of bodied ferric sulfate and 2 ‰ (mass ratio, mud dry weights) that flocculant additive amount is 5%
Polyacrylamide.Sludge is dehydrated 10 days in geotextile tube bag, moisture content average out to 48%.
Embodiment 3
Implementation changes ultrasonic wave and flocculated sequence, sludge is introduced into flocculation after pH is reconciled to 9 with embodiment 2
Reaction unit adds the cationic-type polyacrylamide of 5% bodied ferric sulfate and 2 ‰ (mass ratio, mud dry weights), then passes through
For frequency range in 28kHz, acoustic density is the ul-trasonic irradiation 6s of 0.1W/mL.Sludge is dehydrated 10 days in geotextile tube bag, aqueous
Rate average out to 55%.
Embodiment 4
For implementation with embodiment 2, the change ul-trasonic irradiation time is 12s.The polyaluminum sulfate that flocculant additive amount is 5%
The cationic-type polyacrylamide of iron and 2 ‰ (mass ratio, mud dry weights).Sludge is dehydrated 10 days in geotextile tube bag, moisture content
Average out to 50%.
The sludge quantity of above each embodiment processing is 100m3/h.The testing result of processing is as shown in the table.It is tied from detection
Fruit can be seen that sludge after ultrasound improves, and not only dewatering is improved, and is enhanced to heavy metal in mud
The filtrate water quality of stabilization processes effect, abjection reaches《Integrated wastewater discharges》(GB8978-1996) primary standard.
1 each embodiment dewatered sludge of table detects table
| Serial number | Moisture content (%) | Cadmium (mg/L) | Lead (mg/L) | Zinc (mg/L) | Arsenic (As) |
| Elute mud | 98 | 6.233 | 5.461 | 23.343 | 0.794 |
| Embodiment 1 | 62 | 8.8×10-3 | 0.833 | 1.422 | 0.016 |
| Embodiment 2 | 48 | 2.0×10-4 | 0.322 | 0.315 | 3.4×10-3 |
| Embodiment 3 | 55 | 1.7×10-3 | 0.451 | 0.913 | 6.5×10-3 |
| Embodiment 4 | 50 | 8.7×10-4 | 0.386 | 0.527 | 4.2×10-3 |
The water quality detection table of 2 each embodiment dehydration filtrate of table
Claims (10)
1. a kind of heavy metal pollution high speed dewatering of slurries system, it is characterised in that：By sludge scratch pool, ultrasonic response device,
Flocculation reaction device and sludge dehydration device are sequentially connected composition；
The ultrasonic response device includes supersonic generator and reactive tank；
The flocculation reaction device includes flocculation tank, and training wall is equipped in the middle part of the flocculation tank by flocculation tank point
It is divided into inorganic flocculating agent reaction zone and organic flocculant reaction zone, the training wall bottom is equipped with opening, keeps inorganic flocculating agent anti-
Area is answered to be connected to organic flocculant reaction zone bottom；The inorganic flocculating agent reaction zone is equipped with inorganic flocculating agent throwing device and stirs
Mix device；The organic flocculant reaction zone is equipped with organic flocculant throwing device and agitating device；
The sludge dehydration device includes waterproof substrate, outer frame body and geotextile tube bag；The outer frame body is fixed at impermeable
On water base bottom, the geotextile tube bag is fixed inside outer frame body.
2. a kind of heavy metal pollution high speed dewatering of slurries system according to claim 1, it is characterised in that：The sludge is temporary
Pond is deposited to be internally provided with agitating device and be provided at an outer portion with basic agent adding set.
3. a kind of heavy metal pollution high speed dewatering of slurries system according to claim 1, it is characterised in that：
The supersonic generator includes signal generator, energy converter and the combination of ultrasonic probe external member；The ultrasonic probe
In intercalation reaction slot；One end top of the reactive tank is equipped with mud inlet, and other end lower part is equipped with mud mouth.
4. a kind of heavy metal pollution high speed dewatering of slurries system according to claim 1, it is characterised in that：
The pool wall top of the inorganic flocculating agent reaction zone is equipped with enters mud pipe；The pool wall top of the organic flocculant reaction zone is set
There is sludge out pipe.
5. a kind of heavy metal pollution high speed dewatering of slurries system according to claim 1, it is characterised in that：It is described waterproof
Substrate is equipped with a rectangular recess, and the quadrangle outer edge of rectangular recess is all provided with hole, is that step is double-deck inside rectangular recess
The lower layer of structure, step double-layer structure is equipped with composite earthwork drainage network and is equipped with drainpipe；
The outer frame body is by four support columns, several straight-flanked rings and four block lengths are rectangular that drain bar is helped to constitute；Four block length is rectangular
It helps drain bar to be spliced into hollow rectangular parallelepiped structure, is fixed by several upper and lower parallel straight-flanked rings outside hollow rectangular parallelepiped structure, respectively
The quadrangle of straight-flanked ring is respectively fixedly disposed on four support columns；
Four support columns of the outer frame body, which are inserted into the outer peripheral hole in rectangular recess quadrangle, realizes outer frame body impermeable water base
Fixation on bottom；The rectangular upper layer for helping drain bar bottom to be fixed at step double-layer structure of four block lengths of the outer frame body；
The mechanical clamp for fixing geotextile tube bag is equipped at the top of the outer frame body.
6. a kind of heavy metal pollution high speed dewatering of slurries system according to claim 5, it is characterised in that：Help drain bar
Medial surface is equipped with vertical ripple.
7. the method that any one of claim 1~6 dewatering system is used for heavy metal pollution high speed dewatering of slurries, feature exist
In：Include the following steps：
1) heavy metal sewage sludge in sludge scratch pool adjusts pH to 7~10；
2) heavy metal sewage sludge in sludge scratch pool is pumped into ultrasonic response device, carries out ultrasonication；
The frequency of the ultrasonic wave is 25~30kHz, and acoustic density is 0.05~0.15W/mL, and ultrasonic treatment time is not more than
10s；
3) heavy metal sewage sludge in ultrasonic response device is pumped into flocculation reaction device, carries out inorganic flocculation treatment successively and has
Machine flocculation treatment；
4) heavy metal sewage sludge in flocculation reaction device, which is pumped into dehydration device, carries out mud-water separation.
8. the method that dewatering system is used for heavy metal pollution high speed dewatering of slurries according to claim 7, it is characterised in that：Institute
The inorganic flocculating agent that inorganic flocculation treatment uses is stated as at least one of bodied ferric sulfate, iron chloride, ferrous sulfate；It is described organic
The organic flocculant that flocculation treatment uses is cationic-type polyacrylamide or anion-polyacrylamide；Wherein, inorganic wadding
The addition of solidifying agent is the 2%~10% of sludge quality；The addition of organic flocculant is 2 ‰~the 5 ‰ of sludge quality, sludge
Quality is measured with butt sludge.
9. the method that dewatering system is used for heavy metal pollution high speed dewatering of slurries according to claim 7, it is characterised in that：Institute
It includes at least one of cadmium, mercury, arsenic, copper, lead, chromium, zinc, nickel heavy metal ion to state heavy metal sewage sludge.
10. the method that dewatering system is used for heavy metal pollution high speed dewatering of slurries according to claim 7, it is characterised in that：
The solid masses concentration of heavy metal sewage sludge is no more than 100.0g/L.
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| CN114231761A (en) * | 2022-03-01 | 2022-03-25 | 生态环境部华南环境科学研究所 | Electroplating sludge chromium element extraction device and method with ultrasonic generator |
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Application publication date: 20180713 |