CN105964670A - Device and method for recycling ex-site chemical elution-remediating eluate for heavy metal contaminated soil - Google Patents
Device and method for recycling ex-site chemical elution-remediating eluate for heavy metal contaminated soil Download PDFInfo
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- CN105964670A CN105964670A CN201610522057.7A CN201610522057A CN105964670A CN 105964670 A CN105964670 A CN 105964670A CN 201610522057 A CN201610522057 A CN 201610522057A CN 105964670 A CN105964670 A CN 105964670A
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- Prior art keywords
- eluate
- washing
- reuse
- heavy
- retort
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a device and a method for recycling ex-site chemical elution-remediating eluate for heavy metal contaminated soil. The device comprises dry drum-type screening equipment (3), a grinder (4), wet drum-type screening equipment (5), a first-stage elution reaction tank (6), a second-stage elution reaction tank (8) and eluate recycling equipment, wherein the eluate recycling equipment comprises an eluate collecting tank (10), a regulating and neutralizing tank (11), electric flocculation equipment (12), an aeration-oxidation tank (13), a diatomite circulating clarification tank (14), a pH value regulating tank (15) and an eluting liquid recycling water pond (16) which sequentially communicate with one another. The method is used for recycling the ex-site chemical elution-remediating eluate by utilizing the device and is applicable to a place which is relatively high in contamination concentration and relatively large in risk; a direct and effective technical method can be selected for intensively treating contaminated soil, and the treatment is high in efficiency and complete. Besides, the eluate can be circularly recycled, energy is saved, and no secondary pollution is generated.
Description
Technical field
The invention belongs to soil remediation field, heavy metal pollution place, refer to a kind of heavy metal pollution further
The ex-situ chemical washing reparation of place soil and the device and method of eluate reuse.
Background technology
Chemical leaching reparation is a kind of important technology being applied to contaminated soil environment remediation, by promoting
Enter the chemical/biological chemical solvent that pollutant in soil environment dissolve or migrate, under gravity or pass through
Hydraulic head promotes leacheate to be injected in contaminated soil layer, the most again include the liquid of pollutant from
Soil layer extracts, carries out separating and the technology of sewage disposal.Leacheate be generally of drip washing, solubilising,
Emulsifying or the effect of change pollutant chemistry character.Up to the present, chemical leaching technology mainly around
Process organic pollution with surfactant, repair contaminated soil by chelating agen or acid treatment heavy metal
Earth.Compared with other processing methods, elution method is possible not only to remove substantial amounts of pollutant in soil, limits
The range of scatter of noxious pollutant, also has investment and consumes relatively fewer, and operator can not directly connect
Touch the advantages such as pollutant.
In the most former chemical leaching repair process, typically bias toward in-situ chemical drip washing reparation,
The most abroad.Though in-situ chemical drip washing repairing polluted soil has many good qualities, as long-lasting, easily grasp
The property made, high osmosis.From the point of view of contaminated soil character, in-situ chemical elution technique has the drawback that,
It is only applicable to concrete dynamic modulus, the soil of easily infiltration.It addition, in-situ immobilization need the character to underground with
And structure sheaf has and understands clearly, and to take to prevent what pollutant in repair process from spreading further to arrange
Execute；Generally, in-situ immobilization needs the longer operation time, and the time cycle is the biggest not
Definitiveness.
Summary of the invention
For the deficiencies in the prior art, the present invention provides contaminated site soil heterotopic recovery technique, and dystopy is repaiied
It is applicable to the contaminated site that pollution concentration is higher, risk is bigger again；The most effective technology can be selected
Method focuses on contaminated soil, and treatment effeciency is high and thorough.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is:
Heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reclamation set, including dry type drum-type
Screening plant, grinder, Wet type drum formula screening plant, one-level drip washing retort, two-step washing react
Tank and eluate equipment for reclaiming；Eluate collecting pit that described eluate equipment for reclaiming includes being sequentially communicated,
Regulation neutralization pond, electricity flocculation apparatus, aeration oxidation pool, kieselguhr Circulation clarifying pool, pH value readjustment pond,
Leacheate reuse pool；It is provided with fine earth earth storage barrel and thick soil bottom described dry type drum-type screening plant
Storage barrel；It is provided with wet fine earth earth storage barrel bottom described Wet type drum formula screening plant and wet thick soil stores
Bucket；The thick soil storage barrel of described dry type drum-type screening plant connects with described grinder top, described
Bottom grinder, the top with described Wet type drum formula screening plant connects；The screening of described dry type drum-type sets
The wet fine earth earth storage barrel of standby fine earth earth storage barrel and described Wet type drum formula screening plant is all with described one
The connection of level drip washing retort top, the wet thick soil storage barrel of described Wet type drum formula screening plant is with described
Grinder top connects；Described one-level drip washing retort connects with described two-step washing retort, and described
One-level drip washing retort all connects with described eluate collecting pit with the top of described two-step washing retort.
Preferred version, the top of described dry type drum-type screening plant connects conveying equipment.
Preferred version, described conveying equipment includes spiral belt conveyor.
Preferred version, is provided with grid inside described dry type drum-type screening plant, and described grid is by two sections of groups
Becoming, one section is the first thin grid, and screening out particle diameter is 15～50mm, is provided with fine earth earth below the first thin grid
Storage barrel；Another section is the first thick grid, and screening out particle diameter is 50～200mm, is provided with below the first thick grid
Thick soil storage barrel.
Preferred version, is provided with grinding movement in described grinder.
Preferred version, is provided with grid inside described Wet type drum formula screening plant, and described grid is by two sections of groups
Becoming, one section is the second thin grid, and screening out particle diameter is 15～50mm, is provided with wet fine earth below the second thin grid
Earth storage barrel, another section is the second thick grid, and screening out particle diameter is 50～200mm, sets below the second thick grid
There is wet thick soil storage barrel.
Preferred version, described one-level drip washing retort inner circumferential top is provided with spray filler pipe, and top is provided with
One-level drip washing retort eluate effluent trough, is provided with the first massing machine in tank.
Preferred version, described one-level drip washing retort top connects to be had and adds wetting system, described in add in wetting system
It is provided with the pipeline that adds water.
Preferred version, described two-step washing retort inner circumferential top is provided with spray chemical feed pipe, and top is provided with
Two-step washing retort eluate effluent trough, is provided with the second massing machine in tank.
Preferred version, described two-step washing retort top connects has medicine machine, in described medicine machine
It is provided with drug feeding pipeline.
Preferred version, connects bottom described two-step washing retort and has sludge treatment device, at described mud
Reason equipment includes mud concentration basin, mud screw pump and the filter press being sequentially connected with.
Preferred version, described mud concentration basin is steel, and steel plate thickness is 10-15mm, is processed into cone bucket
Type, cone bucket angle is 150 °.
Preferred version, is provided with the first air stirring pipe bottom described regulation neutralization pond, described regulation neutralizes
It is provided with lime cream by pond and adds tank.
Preferred version, described electricity flocculation apparatus is up provided with pole plate away from 450-500mm space from the bottom of pond,
Polar plate bracket is provided above with polylith pole plate.
Preferred version, is provided with the mixed aerator of rotation at the bottom of described aeration oxidation pool pond, inwall limit is provided with liquid level
Meter, is provided with lifting water pump by pond.
Preferred version, described kieselguhr Circulation clarifying pool be up disposed with from bottom water inlet pipe, nozzle,
Trunnion and the first reative cell, the first reative cell side is provided with the second reative cell, and the second reative cell top sets
Being equipped with inclined tube assembly, inclined tube assembly top is provided with annular collecting vat；Described kieselguhr Circulation clarifying pool pond
The end, is provided with discharge pipeline, and top, pond is provided with trunnion lifter.
Preferred version, described pH value readjustment is provided with the second air stirring pipe bottom pond, adding of the other setting in pond
Medicine device.
Preferred version, is provided with immersible pump at the bottom of described leacheate reuse pool pond, and pool wall top is provided with circulation
Reuse pipe, described circulating and recovering pipe connects with described one-level drip washing retort top.
Heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse method, comprises the following steps:
(1) heavy-metal contaminated soil is carried out dry sieving, through dry sieving, the fine earth of 15～50mm particle diameters
Earth carries out one-level drip washing, and the thick soil of 50～200mm particle diameters is ground；One-level drip washing is with clear water as drip washing
Agent, liquid-solid ratio 8-12:1, pH value 5～8, drip washing time 6-10h, the stirring response time is 2-3h；
(2) polished soil carries out wet sieving, through wet sieving, less than 15mm particle diameter
Fine earth earth carries out the drip washing of step (1) described one-level equally；The thick soil of 50～200mm particle diameters return again to into
Row grinds；
(3) mud after one-level is drenched carrying out two-step washing, two-step washing reaction is with malic acid for drenching
Lotion, adding concentration is 0.1-0.2mol/L, liquid-solid ratio 8-12:1, pH value 4～5, drip washing time 12-14h,
The stirring response time is 4-6h；
(4) collect the supernatant after one-level drip washing and two-step washing precipitation it is carried out at eluate reuse
Reason；Eluate first adjusts pH value between 7.5～8.5；After pH value adjusts, eluate enters electricity flocculation apparatus,
Make pH value be maintained between 8.5～10.0, occur electrolytic flocculation, electrofloatation and electrolysis oxidation-reduction anti-
Should；Electricity flocculation apparatus water outlet carries out aeration agitation and oxidation reaction；Aeration tank water outlet enters kieselguhr circulation
Clarifying treatment, the process water outlet of kieselguhr circular clarifying carries out pH value and pulls back between 6～9；
(5) through two-step washing precipitate after mud be compressed, filter after store up, qualified after recycling.
Preferred version, uses heavy-metal contaminated soil ex-situ chemical washing reparation and eluate reclamation set to enter
Row processes, and specifically includes following steps:
(1) heavy-metal contaminated soil is delivered to dry type drum-type screening plant, sieves through dry type,
The fine earth earth of 15～50mm particle diameters falls into fine earth earth storage barrel, is delivered to one-level drip washing retort and carries out drip washing,
The thick soil of 50～200mm particle diameters falls into thick soil storage barrel, is delivered to grinder and is ground；One-level is drenched
Washing and react with clear water as eluent, liquid-solid ratio 8-12:1, pH value 5～8, drip washing time 6-10h, stirring is anti-
It is 2-3h between Ying Shi；
(2) polished soil enters Wet type drum formula screening plant, Wet type drum formula screening plant
When soil is sieved, the sparge pipe being arranged on top spray water to carry out wet screening；Through wet sieving,
Fall in wet fine earth earth storage barrel less than the fine earth earth of 15mm particle diameter, be delivered to first class reaction pot and drench
Wash；The thick soil of 50～200mm particle diameters falls into wet thick soil storage barrel, returns grinder and is ground；
(3) mud after one-level drip washing retort is washed enters two-step washing retort and carries out medicine and wash,
Two-step washing reacts with malic acid as eluent, and adding concentration is 0.1-0.2mol/L, liquid-solid ratio 8-12:1,
PH value 4～5, drip washing time 12-14h, the stirring response time is 4-6h；
(4) target heavy metal supernatant after one-level drip washing retort and two-step washing retort precipitate
Eluate is drained into by one-level drip washing retort eluate effluent trough, two-step washing retort eluate effluent trough
Collecting pit carries out eluate Treatment for Reuse；
(5) eluate is adjusted neutralization pond, electricity flocculation apparatus, aeration oxidation pool, kieselguhr circular clarifying
Pond and pH readjustment pond enter leacheate reuse pool, by the immersible pump being arranged on bottom pond through pool wall after processing
The circulating and recovering pipe that top is arranged is back to one-level drip washing retort and carries out drip washing；
(6) mud after stirring reaction precipitation washed by two-step washing retort medicine is dense from bottom entrance mud
Being risen to filter press by mud screw rod pumping behind contracting pond squeeze, the mud after squeezing is stacked to storage
Keep between mud, process qualified earthen backfill to qualified earthen backfill field.
Further preferred scheme, the idiographic flow of described eluate Treatment for Reuse includes: eluate is through adjusting
Joint neutralization pond neutralizes reaction tank before entering and carries out pH value adjustment, makes pH value be maintained between 7.5～8.5；pH
After value adjusts, eluate enters electricity flocculation apparatus, makes pH value be maintained between 8.5～10.0, preferably to send out
Raw electrolytic flocculation, electrofloatation and electrolysis oxidation-reduction reaction；Electricity flocculation apparatus water outlet enters aeration oxygen
Change pond and carry out aeration agitation and oxidation reaction；Aeration tank water outlet enters kieselguhr Circulation clarifying pool, and is entering
Add tripolite solution on water pipe in the lump, spray into trunnion, nozzle flow velocity control through nozzle with higher flow velocity
System, 7～more than 9m/s, occurs negative pressuren zone around nozzle, makes about 3～5 times of former water yields of horn mouth adnexa
Body refuse water in company with former water suck trunnion, larynx velocity in pipes with 2～3m/s, reacted after flow to the first reative cell,
Current are during the first reative cell and the second reative cell, and the cross-section of river gradually expands, upper up-flow
Speed is gradually reduced, and contacting with each other with the tiny flocculation body in water for the active sludge of different-grain diameter, it is good to provide
Condition；The water flowed out from the second reative cell, a part is upwardly into inclined tube assembly, and body refuse sinks rapidly,
The remainder water that the body refuse sunk flows out with the second reative cell is back to again around nozzle, the most repeatedly
It is circulated；Kieselguhr Circulation clarifying pool water outlet enter pH value readjustment pond, make pH value pull back to 6～9 it
Between；PH value readjustment pond water outlet enters leacheate reuse tank, is back to one-level drip washing retort and carries out drip washing.
According to technique scheme, the invention has the beneficial effects as follows: ex-situ chemical washing reparation is applicable to dirt
The dye place that concentration is higher, risk is bigger；The most effective technical scheme can be selected to focus on dirt
Dye soil, treatment effeciency is high and thorough.It addition, to eluate circulating and recovering, save the energy, without secondary
Pollute.
Accompanying drawing explanation
Fig. 1 is that a kind of heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reclamation set；
Fig. 2 is the process chart that a kind of heavy-metal contaminated soil ex-situ chemical washing is repaired；
In the drawings:
1-contaminated soil feed bin
2-conveying equipment
3-dry type drum-type screening plant, the thin grid of 3-1-first, 3-2-fine earth earth storage barrel, 3-3-first is thick
Grid, 3-4-thick soil storage barrel
4-grinder, 4-1-grinds movement
5-Wet type drum formula screening plant, the thin grid of 5-1-second, 5-2-wet fine earth earth storage barrel, 5-3-second
Thick grid, the wet thick soil storage barrel of 5-4-
6-one-level drip washing retort, 6-1-sprays filler pipe, 6-2-one-level drip washing retort eluate effluent trough,
6-3-the first massing machine
7-adds wetting system
8-two-step washing retort, 8-1-sprays chemical feed pipe, 8-2-two-step washing retort eluate effluent trough,
8-3-the second massing machine
9-medicine machine
10-eluate collecting pit, 10-1-feed tube
11-regulates neutralization pond, 11-1-the first air stirring pipe, and 11-2-lime cream adds tank
12-electricity flocculation apparatus, 12-1-polar plate bracket, 12-2-pole plate, 12-3-external power source, 12-4-pH value
Regulation system
13-aeration oxidation pool, the mixed aerator of 13-1-rotation, 13-2-liquidometer, 13-3-elevator pump
14-kieselguhr Circulation clarifying pool, 14-1-water inlet pipe, 14-2-nozzle, 14-3-trunnion, 14-4-first is anti-
Answer room, 14-5-the second reative cell, 14-6-annular collecting vat, 14-7-inclined tube assembly, 14-8-discharge pipeline, 14-9-
Trunnion lifter
15-pH value readjustment pond, 15-1-the second air stirring pipe, 15-2-chemicals dosing plant
16-leacheate reuse pool, 16-1-immersible pump, 16-2-circulating and recovering pipe
17-mud concentration basin
18-mud screw pump
19-filter press
Keep between 20-storage mud
21-qualified earthen backfill field.
Detailed description of the invention
Embodiment 1
In order to be more fully understood that the present invention, below in conjunction with embodiment detailed description further to the present invention.
As it is shown in figure 1, the present invention one heavy metal species tail contaminated site soil heterotopic chemical leaching repair and
The device of eluate reuse, including dry type drum-type screening plant 3, grinder 4, the screening of Wet type drum formula
Equipment 5, one-level drip washing retort 6, two-step washing retort 8 and eluate equipment for reclaiming；Described wash
Go out eluate collecting pit 10 that liquid equipment for reclaiming includes being sequentially communicated, regulation neutralization pond 11, electricity flocculation apparatus
12, aeration oxidation pool 13, kieselguhr Circulation clarifying pool 14, pH value readjustment pond 15, leacheate recycle-water
Pond 16；It is provided with fine earth earth storage barrel 3-2 bottom described dry type drum-type screening plant 3 and thick soil stores
Bucket 3-4；Wet fine earth earth storage barrel 5-2 and wet thick soil it is provided with bottom described Wet type drum formula screening plant 5
Storage barrel 5-4；The thick soil storage barrel 3-4 of described dry type drum-type screening plant 3 and described grinder 4
Top connects, and bottom described grinder 4, the top with described Wet type drum formula screening plant 5 connects；Institute
State the fine earth earth storage barrel 3-2 of dry type drum-type screening plant 3 and described Wet type drum formula screening plant 5
Wet fine earth earth storage barrel 5-2 all connect with described one-level drip washing retort 6 top, described Wet type drum formula
The wet thick soil storage barrel 5-4 of screening plant 5 connects with described grinder 4 top；Described one-level drip washing is anti-
Tank 6 is answered to connect with described two-step washing retort 8, and described one-level drip washing retort 6 and described two grades
The top of drip washing retort 8 all connects with described eluate collecting pit 1.
In Fig. 1, soil feed bin 1 is steel, and steel plate thickness is 10mm, and feed bin has hopper, cylinder, gathers dust
Device, relief valve, level-sensing device, vibrator, manhole, cat ladder, railing, cooling system, weighing system etc.
Composition.
Described conveying equipment 2 is containing spiral belt conveyor.
The grid of described dry type drum-type screening plant 3 is formed by two sections, and one section is the first thin grid 3-1,
Screening out particle diameter is 15～50mm, is furnished with fine earth earth storage barrel 3-2 below；The other end is the second thick grid 3-3,
Screening out particle diameter is 50～200mm, is furnished with thick soil storage barrel 3-4 below.
Grinding movement 4-1 it is provided with in described grinder 4.
Described Wet type drum formula screening plant 5 grid is formed by two sections, and one section is the second thin grid 5-1, sieve
Except particle diameter is 15～50mm, bottom is furnished with wet fine earth earth storage barrel 5-2, and the other end is the second thick grid 5-3,
Screening out particle diameter is 50～200mm, and bottom is furnished with wet thick soil storage barrel 5-4.Wet type drum formula screening plant
When soil is sieved, by being arranged on the sparge pipe on equipment top to carry out wet screening.
Described one-level drip washing retort 6 is steel, and steel plate thickness is 10mm, is processed into cone bucket type, cone bucket
Angle is 135 °, uses three cloth four oil to carry out anticorrosion in tank.One-level drip washing retort 6 inner top circumference sets
Being equipped with spray filler pipe 6-1, spray filler pipe caliber is DN32mm, along pipe bottom centerline angle 45 °
Staggered, spacing is 100mm, has diameter 5mm hole；Outer, one-level drip washing retort top is provided with
One-level drip washing retort eluate effluent trough 6-2；Tank is provided with the first massing machine 6-3, blender
Rotating speed is 136r/min.
The described wetting system 7 that adds contains the pipeline that adds water, a diameter of DN32mm.One-level drip washing reaction with clear water is
Eluent, liquid-solid ratio 10:1, pH value 5～8, drip washing time 6h, the stirring response time is 2h, target weight
Metal As, Cr, Pb, Zn etc..With clear water as leacheate, the secondary that leacheate may bring can be avoided
Pollute.
Described two-step washing retort 8 is steel, and steel plate thickness is 10mm, is processed into cone bucket type, cone bucket
Angle is 135 °, uses three cloth four oil to carry out anticorrosion in tank.Two-step washing retort 8 inner top circumference sets
Being equipped with spray chemical feed pipe 8-1, spray chemical feed pipe caliber is DN32mm, along pipe bottom centerline angle 45 °
Staggered, spacing is 100mm, has diameter 5mm hole；Outer, two-step washing retort top is provided with two grades
Drip washing retort eluate effluent trough 8-2；Tank is provided with the second massing machine 8-3, blender rotating speed
For 100r/min.
Described medicine machine 9 is containing drug feeding pipeline, a diameter of DN32mm.Two-step washing reacts with malic acid
For eluent, adding concentration is 0.1mol/L, liquid-solid ratio 10:1, pH value 4～5, and drip washing time 12h stirs
Mixing the response time is 4h.Target heavy metal is Dd, Cr, Pb, Hg etc..
The import of described eluate collecting pit 10 is provided with feed tube 10-1.
Being provided with the first air stirring pipe 11-1 bottom described regulation neutralization pond 11, air stirring pipe is a diameter of
DN32mm, bore dia is 5mm, pitch-row 200mm, and eyelet is staggered straight at 45 ° downwards.
Chi Ding is provided with lime cream and adds tank 11-2.By be arranged on the lime cream of Chi Ding add tank add alkalescence stone
PH value is adjusted by ash breast, makes pH value be maintained between 7.5～8.5.
Described electricity flocculation apparatus 12 is up provided with polar plate bracket 12-1, pole away from 450mm space from the bottom of pond
Board mount is with [channel-section steel of 80 × 8mm makes, and polar plate bracket is provided above with pole plate 12-2, and pole plate specification is
Length × width x thickness=800 × 500 × 10mm, makes of iron plate, and pole plate and external power source 12-3 use one pole
Mode connects, i.e. odd number polar plate cathode wire is connected with the negative pole of external power source, even number pole plate anode
Wire is connected with external power source positive pole.Other pH value regulation system 12-4 arranged in pond, including soda acid tank and join
System processed, frequency conversion dosing pump and pH meter, pH value is fine-tuning between 8.5～10.0.
Being provided with the mixed aerator 13-1 of rotation at the bottom of described aeration oxidation pool 13 pond, inwall is provided with liquidometer 13-2,
Elevator pump 13-3 it is provided with by pond.
Described kieselguhr Circulation clarifying pool 14 be up disposed with from bottom water inlet pipe 14-1 (and water inlet
Add tripolite solution on pipe in the lump), nozzle 14-2, trunnion 14-3, the first reative cell 14-4 are other arranges
Having the second reative cell 14-5, the second reative cell top to be provided with inclined tube assembly 14-7, inclined tube assembly top sets
It is equipped with annular collecting vat 14-6, at the bottom of pond, is provided with discharge pipeline 14-8, the residue containing heavy metal discharged
Mud is carried out resource reclaim by the unit having qualification, and Chi Ding is provided with trunnion lifter 14-9.
Described pH value readjustment is provided with the second air stirring pipe 15-1, the second air stirring pipe bottom pond 15
A diameter of DN25mm, bore dia is 4mm, and pitch-row is 150mm, and eyelet is downwards straight at 45 °
Being staggered, the chemicals dosing plant 15-2 that Chi Ding is arranged adds dilution heat of sulfuric acid in pond, makes pH pull back to
Between 6～9.
It is provided with immersible pump 16-1 bottom described leacheate reuse pool 16, pool wall is provided with circulating and recovering
Pipe 16-2.
Described mud concentration basin 17 is steel, and steel plate thickness is 10mm, is processed into cone bucket type, cone bucket folder
Angle is 150 °, uses three cloth four oil anticorrosions in pond.
Described mud screw pump 18 and filter press 19 support the use, in order to process the soil after drip washing
Earth mud.
Between described storage mud, temporary 20 is a worker-house, with temporary soil after drip washing process is qualified.
Described qualified earthen backfill is for deliver to qualified earthen backfill field 21 with automobile.
The work process of the described present invention: will be containing heavy metals such as As, Cd, Pb, Zn, Hg with excavator
Contaminated soil loads contaminated soil feed bin 1, conveying equipment 2 be delivered to dry type drum-type screening plant 3,
Sieving through dry type, the fine earth earth of 15～50mm particle diameters falls into fine earth earth storage barrel 3-2, is delivered to one-level
Drip washing retort 6 carries out drip washing；The thick soil of 50～200mm particle diameters falls into thick soil storage barrel 3-4, defeated
Deliver to grinder 4 be ground；Polished soil enters Wet type drum formula screening plant 5, and wet type is rolled
When soil is sieved by cartridge type screening plant, the sparge pipe being arranged on top spray water to carry out wet screening.
Through wet sieving, fall in wet fine earth earth storage barrel 5-2 less than the fine earth earth of 15mm particle diameter, be delivered to
First class reaction pot carries out drip washing.One-level drip washing is reacted with clear water as eluent, liquid-solid ratio 10:1, pH value 5～8,
Drip washing time 6h, the stirring response time is 2h, and target heavy metal is As, Cd, Pb, Zn, Hg etc.；
The thick soil of 50～200mm particle diameters falls into wet thick soil storage barrel 5-4；Return grinder is ground.Warp
Cross the mud after the washing of one-level drip washing retort to enter two-step washing retort and carry out medicine and wash, during two-step washing
Between 12h, the stirring response time is 4h.Target heavy metal is that Cd, Pb, Zn, Hg etc. are through one-level drip washing
Supernatant after retort 6 and two-step washing retort 8 precipitation is by one-level drip washing retort eluate water outlet
Groove 6-2, two-step washing retort eluate effluent trough 8-2 drain into eluate collecting pit 10, are adjusted neutralization
Pond 11, electricity flocculation apparatus 12, aeration oxidation pool 13, kieselguhr Circulation clarifying pool 14 and pH value readjustment
Pond 15 enters leacheate reuse pool 16, by the immersible pump 16-1 being arranged on bottom pond through pool wall after processing
The circulating and recovering pipe 16-2 that top is arranged is back to leacheate circulation recycle system.React through two-step washing
Tank 8 medicine washes the mud after stirring reaction precipitation after bottom entrance mud concentration basin 17 by mud screw pump 18
Taking out and rise to filter press 19 and squeeze, the mud after squeezing stacks between storage mud temporary 20, processes
Qualified earthen backfill 21 is for being transported to outside automobile backfill address.
Embodiment 2
Certain contaminated site soil heterotopic chemical leaching repairs pilot scale demonstration project
(1) management goal
It is Cd, Pb, Zn, As and Hg that target contaminant is repaired in drip washing.Whole demonstration project drip washing treating capacity
About 1.2 ten thousand tons.It is as follows that the multiple metal Soil leaching of demonstration project repairs target:
1) after repairing, the content of heavy metal in soil reaches " tackling standard " (GB15618-1995)
Secondary standard, is backfilling into original position.
2) the old leacheate produced in repair process processes Posterior circle reuse.
3) sludge containing heavy metal produced in repair process is hazardous waste, entrusts the processed in units having qualification.
(2) technical process is repaired as shown in Figure 2
(3) main control parameters
1) one-level drip washing is reacted with clear water as leacheate, liquid-solid ratio 10:1, pH value 5～8, the drip washing time
6h, stirs response time 2h；
2) two-step washing reacts with malic acid as eluent, and adding concentration is 0.1mol/L, liquid-solid ratio 10:1,
PH value 4～5, drip washing time 12h, the stirring response time is 4h；
3) design parameter of eluate Treatment for Reuse: front neutralization reaction tank pH value is maintained between 7.5～8.5；Electricity
Flocculation apparatus pH value is maintained between 8.5～10.0；Nozzle flow speed control is 7～more than 9m/s；In trunnion
Flow velocity is with 2～3m/s；PH value readjustment pond is between 6～9.
Claims (21)
1. heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reclamation set, sieves including dry type drum-type
Subset (3), grinder (4), Wet type drum formula screening plant (5), one-level drip washing retort (6),
Two-step washing retort (8) and eluate equipment for reclaiming；Described eluate equipment for reclaiming includes connecting successively
Logical eluate collecting pit (10), regulation neutralization pond (11), electricity flocculation apparatus (12), aeration oxidation pool
(13), kieselguhr Circulation clarifying pool (14), pH value readjustment pond (15), leacheate reuse pool (16)；
Described dry type drum-type screening plant (3) bottom is provided with fine earth earth storage barrel (3-2) and thick soil storage barrel
(3-4)；Described Wet type drum formula screening plant (5) bottom is provided with wet fine earth earth storage barrel (5-2) and wet
Thick soil storage barrel (5-4)；The thick soil storage barrel (3-4) of described dry type drum-type screening plant (3)
Connecting with described grinder (4) top, described grinder (4) bottom is sieved with described Wet type drum formula
The top connection of equipment (5)；Fine earth earth storage barrel (3-2) of described dry type drum-type screening plant (3)
With wet fine earth earth storage barrel (5-2) of described Wet type drum formula screening plant (5) all with described one-level drip washing
Retort (6) top connects, the wet thick soil storage barrel (5-4) of described Wet type drum formula screening plant (5)
Connect with described grinder (4) top；Described one-level drip washing retort (6) is anti-with described two-step washing
Tank (8) is answered to connect, and described one-level drip washing retort (6) and described two-step washing retort (8)
Top all connects with described eluate collecting pit (1).
The most according to claim 1, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: the top of described dry type drum-type screening plant (3) connects conveying equipment (2).
The most according to claim 2, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: described conveying equipment (2) includes spiral belt conveyor.
The most according to claim 1, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: described dry type drum-type screening plant (3) is internal is provided with grid, and described grid is by two
Duan Zucheng, one section is the first thin grid (3-1), and screening out particle diameter is 15～50mm, the first thin grid (3-1)
Lower section is provided with fine earth earth storage barrel (3-2)；Another section is the first thick grid (3-3), and screening out particle diameter is
50～200mm, the first thick grid (3-3) lower section is provided with thick soil storage barrel (3-4).
The most according to claim 1, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: in described grinder (4), be provided with grinding movement (4-1).
The most according to claim 1, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: described Wet type drum formula screening plant (5) is internal is provided with grid, and described grid is by two
Duan Zucheng, one section is the second thin grid (5-1), and screening out particle diameter is 15～50mm, the second thin grid (5-1)
Lower section is provided with wet fine earth earth storage barrel (5-2), and another section is the second thick grid (5-3), and screening out particle diameter is
50～200mm, the second thick grid (5-3) lower section is provided with wet thick soil storage barrel (5-4).
The most according to claim 1, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: described one-level drip washing retort (6) inner circumferential top is provided with spray filler pipe (6-1),
Top is provided with one-level drip washing retort eluate effluent trough (6-2), is provided with the first massing machine in tank
(6-3)。
The most according to claim 7, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: described one-level drip washing retort (6) top connects to be had and add wetting system (7), described in add
Wetting system is provided with, in (7), the pipeline that adds water.
The most according to claim 1, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: described two-step washing retort (8) inner circumferential top is provided with spray chemical feed pipe (8-1),
Top is provided with two-step washing retort eluate effluent trough (8-2), is provided with the second massing machine in tank
(8-3)。
The most according to claim 9, heavy-metal contaminated soil ex-situ chemical washing is repaired and eluate reuse fills
Put, it is characterized in that: described two-step washing retort (8) top connect have medicine machine (9), described in add
Medicine equipment is provided with drug feeding pipeline in (9).
11. according to claim 1 heavy-metal contaminated soil ex-situ chemical washing repair and eluate reuse fill
Put, it is characterized in that: described two-step washing retort (8) bottom connects sludge treatment device, described dirt
Mud processing equipment includes mud concentration basin (17), mud screw pump (18) and the filter press being sequentially connected with
Machine (19).
12. repair and eluate reuse dress according to heavy-metal contaminated soil ex-situ chemical washing described in claim 11
Put, it is characterized in that: described mud concentration basin (17) is steel, and steel plate thickness is 10-15mm, processing
Becoming cone bucket type, cone bucket angle is 150 °.
13. according to claim 1 heavy-metal contaminated soil ex-situ chemical washing repair and eluate reuse fill
Put, it is characterized in that: described regulation neutralization pond (11) bottom is provided with the first air stirring pipe (11-1),
Described regulation neutralization pond (4) side is provided with lime cream and adds tank (11-2).
14. according to claim 1 heavy-metal contaminated soil ex-situ chemical washing repair and eluate reuse fill
Put, it is characterized in that: described electricity flocculation apparatus (12) is up provided with away from 450-500mm space from the bottom of pond
Pole plate (12-1), polar plate bracket is provided above with polylith pole plate (12-2).
15. according to claim 1 heavy-metal contaminated soil ex-situ chemical washing repair and eluate reuse fill
Put, it is characterized in that: at the bottom of described aeration oxidation pool (13) pond, be provided with the mixed aerator (13-1) of rotation, inwall
While be provided with liquidometer (13-2), by pond, it is provided with lifting water pump (13-3).
16. according to claim 1 heavy-metal contaminated soil ex-situ chemical washing repair and eluate reuse fill
Put, it is characterized in that: described kieselguhr Circulation clarifying pool (14) is up disposed with water inlet pipe from bottom
(14-1), nozzle (14-2), trunnion (14-3) and the first reative cell (14-4), the first reative cell (14-4)
Side is provided with the second reative cell (14-5), and the second reative cell top is provided with inclined tube assembly (14-7), tiltedly
Pipe assembly top is provided with annular collecting vat (14-6)；Set at the bottom of described kieselguhr Circulation clarifying pool (14) pond
Being equipped with discharge pipeline (14-8), top, pond is provided with trunnion lifter (14-9).
17. according to claim 1 heavy-metal contaminated soil ex-situ chemical washing repair and eluate reuse fill
Put, it is characterized in that: described pH value readjustment pond (15) bottom is provided with the second air stirring pipe (15-1),
The other chemicals dosing plant (15-2) arranged in pond.
18. according to claim 1 heavy metal pollution place soil chemical leaching liquid circulating and recovering process dress
Put, it is characterized in that: at the bottom of described leacheate reuse pool (16) pond, be provided with immersible pump (16-1), pool wall
Top is provided with circulating and recovering pipe (16-2), and described circulating and recovering pipe (16-2) is reacted with described one-level drip washing
Tank (6) top connects.
19. heavy-metal contaminated soil ex-situ chemical washings repair and eluate reuse methods, it is characterized in that, including with
Lower step:
(1) heavy-metal contaminated soil being carried out dry sieving, through dry sieving, the fine earth earth of 15～50mm particle diameters enters
Row one-level drip washing, the thick soil of 50～200mm particle diameters is ground；One-level drip washing with clear water as eluent,
Liquid-solid ratio 8-12:1, pH value 5～8, drip washing time 6-10h, the stirring response time is 2-3h；
(2) polished soil carries out wet sieving, through wet sieving, less than the fine earth of 15mm particle diameter
Earth carries out the drip washing of step (1) described one-level equally；The thick soil of 50～200mm particle diameters returns again to grind
Mill；
(3) mud after one-level is drenched being carried out two-step washing, two-step washing reacts with malic acid as eluent,
Adding concentration is 0.1-0.2mol/L, liquid-solid ratio 8-12:1, pH value 4～5, drip washing time 12-14h, stirring
Response time is 4-6h；
(4) collect the supernatant after one-level drip washing and two-step washing precipitation and it is carried out eluate Treatment for Reuse；Wash
Going out liquid first adjusts pH value between 7.5～8.5；After pH value adjusts, eluate enters electricity flocculation apparatus, makes pH
Value is maintained between 8.5～10.0, and electrolytic flocculation, electrofloatation and electrolysis oxidation-reduction reaction occur；
Electricity flocculation apparatus water outlet carries out aeration agitation and oxidation reaction；Aeration tank water outlet enters kieselguhr circular clarifying
Processing, the process water outlet of kieselguhr circular clarifying carries out pH value and pulls back between 6～9；
(5) through two-step washing precipitate after mud be compressed, filter after store up, qualified after recycling.
20. repair and eluate reuse side according to heavy-metal contaminated soil ex-situ chemical washing described in claim 19
Method, is characterized in that, uses the described device of one of claim 1-18, specifically includes following steps:
(1) heavy-metal contaminated soil is delivered to dry type drum-type screening plant, sieves through dry type, 15～50mm
The fine earth earth of particle diameter falls into fine earth earth storage barrel, is delivered to one-level drip washing retort and carries out drip washing,
The thick soil of 50～200mm particle diameters falls into thick soil storage barrel, is delivered to grinder and is ground；One-level is drenched
Washing and react with clear water as eluent, liquid-solid ratio 8-12:1, pH value 5～8, drip washing time 6-10h, stirring is anti-
It is 2-3h between Ying Shi；
(2) polished soil enters Wet type drum formula screening plant, and Wet type drum formula screening plant is to soil
When sieving, the sparge pipe being arranged on top spray water to carry out wet screening；Through wet sieving, less than 15mm
The fine earth earth of particle diameter falls in wet fine earth earth storage barrel, is delivered to first class reaction pot and carries out drip washing；
The thick soil of 50～200mm particle diameters falls into wet thick soil storage barrel, returns grinder and is ground；
(3) mud after one-level drip washing retort is washed enters two-step washing retort and carries out medicine and wash, two grades
Drip washing is reacted with malic acid as eluent, and adding concentration is 0.1-0.2mol/L, liquid-solid ratio 8-12:1, pH value
4～5, drip washing time 12-14h, the stirring response time is 4-6h；
(4) target heavy metal supernatant after one-level drip washing retort and two-step washing retort precipitate is by one
Level drip washing retort eluate effluent trough, two-step washing retort eluate effluent trough drain into eluate and collect
Pond carries out eluate Treatment for Reuse；
(5) eluate be adjusted neutralization pond, electricity flocculation apparatus, aeration oxidation pool, kieselguhr Circulation clarifying pool and
PH readjustment pond enters leacheate reuse pool, by the immersible pump being arranged on bottom pond through pool wall top after processing
The circulating and recovering pipe arranged is back to one-level drip washing retort and carries out drip washing；
(6) mud after stirring reaction precipitation washed by two-step washing retort medicine enters mud concentration basin from bottom
After risen to filter press by mud screw rod pumping and squeeze, the mud after squeezing is stacked between storage mud
Temporary, process qualified earthen backfill to qualified earthen backfill field.
21. repair and eluate reuse side according to heavy-metal contaminated soil ex-situ chemical washing described in claim 20
Method, is characterized in that, the idiographic flow of eluate Treatment for Reuse includes: eluate is adjusted neutralization pond and enters
Front neutralization reaction tank carries out pH value adjustment, makes pH value be maintained between 7.5～8.5；PH value is washed after adjusting
Go out liquid enter electricity flocculation apparatus, make pH value be maintained between 8.5～10.0, with preferably occur electrolytic flocculation,
Electrofloatation and electrolysis oxidation-reduction reaction；Electricity flocculation apparatus water outlet enters aeration oxidation pool and carries out aeration
Stirring and oxidation reaction；Aeration tank water outlet enters kieselguhr Circulation clarifying pool, and adds in the lump on water inlet pipe
Enter tripolite solution, spray into trunnion through nozzle with higher flow velocity, nozzle flow speed control 7～9m/s with
On, negative pressuren zone occurs around nozzle, makes the body refuse water of about 3～5 times of former water yields of horn mouth adnexa in company with former
Water suck trunnion, larynx velocity in pipes with 2～3m/s, reacted after flow to the first reative cell, current pass through
During first reative cell and the second reative cell, the cross-section of river gradually expands, and upflow velocity is gradually reduced,
Contact with each other with the tiny flocculation body in water for the active sludge of different-grain diameter and provide good condition；From
The water that two reative cells flow out, a part is upwardly into inclined tube assembly, and body refuse sinks rapidly, the body refuse of sinking
The remainder water flowed out with the second reative cell is back to again around nozzle, is the most repeatedly circulated；
Kieselguhr Circulation clarifying pool water outlet enters pH value readjustment pond, makes pH value pull back between 6～9；PH value returns
Adjust pond water outlet to enter leacheate reuse tank, be back to one-level drip washing retort and carry out drip washing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522057.7A CN105964670A (en) | 2016-07-05 | 2016-07-05 | Device and method for recycling ex-site chemical elution-remediating eluate for heavy metal contaminated soil |
| PCT/CN2017/089284 WO2018006708A1 (en) | 2016-07-05 | 2017-06-21 | Apparatus and method for ex-situ chemical elution remediation of heavy metal contaminated soil and recycle of eluate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522057.7A CN105964670A (en) | 2016-07-05 | 2016-07-05 | Device and method for recycling ex-site chemical elution-remediating eluate for heavy metal contaminated soil |
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| WO (1) | WO2018006708A1 (en) |
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