CN105478458A - Device and method for treating river sediment heavy metal pollution in situ - Google Patents
Device and method for treating river sediment heavy metal pollution in situ Download PDFInfo
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- CN105478458A CN105478458A CN201510976505.6A CN201510976505A CN105478458A CN 105478458 A CN105478458 A CN 105478458A CN 201510976505 A CN201510976505 A CN 201510976505A CN 105478458 A CN105478458 A CN 105478458A
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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
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention discloses a device and method for treating river sediment heavy metal pollution in situ. The device comprises a seal cover and a stirring system, wherein the seal cover comprises a cylinder and a cylinder top bottom plate; a heavy metal adsorption material layer is arranged on the inner wall of the cylinder; the stirring system comprises a driving motor, a drive rod and a circular top plate; and stirring pillars are arranged on the circular top plate. The device is used for treating river sediment heavy metal pollution, and has the characteristics that the speed is high, the adsorption efficiency for heavy metals is high, the floor space is small, and the totally enclosed type operation can be achieved; the river sediment treatment process is simple, the seal cover is directly inserted into the river sediment, the driving motor is started for stirring the river sediment, and a heavy metal activator is added, so that heavy metals are dissolved out and are adsorbed by a metal adsorption material; and according to the method, heavy metals in river sediment can be effectively removed and recycled, the original ecological system is not damaged, highly difficult technologies like closure are not required, and the secondary pollution is avoided.
Description
Technical field
The present invention relates to the device of a kind of in-situ treatment river bottom mud heavy metal pollution and remove river bottom mud heavy metal method fast, belonging to river course Heavy Metal Pollution technical field.
Background technology
River bottom mud refers to the superficial deposit material of water bottom, the mixture be made up of microorganism, humus, soil and silt etc., is deposited on water bottom is formed through long-time physical chemistry, biological agent and water body transmission.Bed mud can reflect the historical process that water body develops, and is the important component part of the natural water ecosystems such as river, lake, mouth of the river beach.
Heavy metal in bed mud comes from atmospheric falling dust, precipitation, soil erosion, rainwash, all kinds of sewage, solid refuse and agricultural chemicals etc., there is the features such as chronicity, cumulative bad, latency and irreversibility, by food chain thousands of hundred times ground enrichment, be finally detrimental to health.Especially the heavy metal pollution that brings of industrial development, because heavy metal can not be biodegradable, when environmental change, generation transforms and is discharged in water body and causes secondary pollution by the Heavy Metals be deposited in bed mud.Simultaneously heavy metal has bioaccumulation, and heavy metal can be retained by biological metabolism, accumulate and be moved the harm producing intoxicating teratogenesis in organism, not only endangers the benthon in river, healthy to people of serious threat simultaneously.
Current countries in the world to the control and plan of Heavy Metal Pollution in Sediments and Treatment process scheme different, especially in China, the factor impacts such as contaminated and Economy Contrast, still do not possess the condition of comprehensively carrying out Heavy Metal Pollution in Sediments control.Different according to the pollution level of polluted water body, in conjunction with the implementation condition of contaminated site,
The recovery technique of heavy metal polluted bed mud conventional at present is mainly divided into in-situ treatment technology and dystopy treatment technology.
In-situ treatment technology mainly comprises original position phytoremediation and fixation in situ technology, its situ phytoremediation is low, simple to operate with its cost, not easily produce the advantages such as secondary pollution and receive much concern, but still it is low to there is treatment effeciency, planting is subject to the defect such as local climate, the impact of river course flood situation.Fixation in situ technology adds curing agent in bed mud, heavy metal is fixed in bed mud, block heavy metal to the migration in water body, this technology affects larger by the solidification physicochemical property of medicament and the water conservancy hydrological characteristics of natural water, and there is no reliable medicament delivery device at present, realize all even larger without leak source covering difficulty.
Dystopy Treatment process needs bed mud to carry out dystopy dredging, but pollutant wherein easily again discharges by bed mud in Dredging Process, affects Upper water's quality; Sediment Dredging needs fairly large earth work to launch simultaneously, bed mud after excavation to need on ground landfill after dehydration stabilization processes, therefore plurality of devices and the techniques such as the stabilisation curing process of bed mud pre-processing device, dehydration equipment and the bed mud that outfit is relevant is needed, complicated operation, take up an area large, cost of investment is high, limits the application of dystopy Treatment process.
Domestic successful repairs contaminated sediments, sedimental example is also rare, imitate developed country spend like that substantial contribution for dredging and Treatment of Sludge also unrealistic to repair bed mud, and chemical redemption easily causes secondary pollution, be unfavorable for the sustainable development of environmental improvement.Bed mud is also easy is again discharged in water body by pollutant in bed mud for excavation, causes secondary pollution to water body and the corresponding ecosystem.Therefore, find neither disturbance bed mud original state, efficiently can remove pollutant in bed mud fast again, can also reduce fund input, cost-saving, based technique for in-situ remediation simple to operate becomes the developing direction of contaminated sediments, deposit in-situ immobilization simultaneously.
Be disclose " contaminated sediments treating apparatus " in the Chinese patent of CN203307188U at Authorization Notice No., this device adopts bed mud dystopy dredging process, flocculation sediment dewatering and bed mud heavy metal stabilization Treatment process is utilized to carry out dystopy improvement to bed mud, landfill stabilization after stabilization processes, the qualified discharge after treatment of the sewage after bottom-mud dewatering.But this device still belongs to bed mud showering technology, need to dredge bed mud, add the risk of secondary pollution water body; Bottom-mud dewatering, stabilisation and the link such as landfill, sewage disposal all need build corresponding structures and add medicament, add treatment cost.
Be disclose in the Chinese patent of CN204661518U " river heavy metal polluted bed mud dystopy governing system " at Authorization Notice No., this system is the integrated of a whole set of sludge handling equipment, comprise roller-type stone washing machine, collection mud sump, screw sand washer, the molten medicine device of leacheate, mud mixes modified pond, mud-settling pit, ring waste reaction tank 7, leacheate precipitation recovery pond, vibratory sieve, hydrocyclone, mud concentration basin, sludge conditioning pond, mechanical dewatering equipment, stable curing mixing plant, tail water chemical reaction pond, tail water chemical precipitation pond, the molten medicine device of flocculant and the molten medicine device of stabilizing agent.Principle remains bed mud coagulating sedimentation dehydration and mechanical dehydration after pretreatment, landfill after the stabilized process of bed mud after dehydration, the sewage produced in bottom-mud dewatering process processes in pond, until qualified discharge further in tail water chemical reaction pond, tail water chemical precipitation.First this cover bed mud governing system needs to excavate polluted bed mud, release is polluted in easy generation, affect Upper water's quality, and processing unit is too much contained by whole system, the up-front investments such as purchase, leased equipment are excessive, and need to take too much construction site, be unfavorable for promoting the use of of this cover bed mud abatement equipment.
Summary of the invention
For the defect that the equipment of existing process river bottom mud heavy metal pollution exists, the object of the invention is to be to provide that a kind of speed is fast when processing river bottom mud heavy metal pollution, heavy metal adsorption efficiency is high, and floor space is little, can the device of totally enclosed type operation.
For the shortcoming that the technology of existing process river bottom mud heavy metal pollution exists, another object of the present invention is to provide one can effectively remove and reclaim heavy metal in river bottom mud, and without the need to destroying original ecosystem, without the need to the highly difficult technique such as damming, do not cause the method for the process river bottom mud heavy metal pollution of secondary pollution.
In order to realize technical purpose of the present invention, the invention provides the device of a kind of in-situ treatment river bottom mud heavy metal pollution, this device comprises seal closure and stirring system; Described seal closure is the semi-enclosed structure be made up of cylinder and barrel top base plate, and the inwall of described cylinder is provided with heavy-metal adsorption material layer, and described base plate is provided with heavy metallic activation agent entrance; Described stirring system comprises driving motor, drive link and circular top plate, is connected between driving motor with circular top plate by drive link, and drive link and circular top plate junction are provided with gear transmission device; Described circular top plate is arranged on cylinder interior, and parallel with barrel top base plate, described circular top plate is provided with vertically downward at least two group teeter columns.
In preferred device, bottom of cylinder barrel is arranged to zigzag.Be convenient to seal closure insert in river bottom mud, and be conducive to seal closure and fix.
In preferred device, heavy-metal adsorption material layer is formed by buying at least one in nano-porous ceramic composite MA01, MF01 and MP01 of Ge Feng tech materials Co., Ltd.The heavy metals such as MA01 primary attachment cadmium, lead, mercury, copper, thallium, MF01 primary attachment arsenic and lead, the feature of MP01 has better suction-operated to cadmium, lead, mercury, copper, thallium etc. in acid condition.Different nanoporous composite ceramic materials is selected according to different heavy metal pollution river courses.The nano-porous ceramic composite that the present invention adopts has hole prosperity (aperture is controlled in 15 nanometers to 200 nanometers), and specific area is high (up to 900m
2/ g) feature, its adsorption rate is high, adsorption capacity is large, and has the physicochemical stability (acid and alkali-resistance, high temperature resistant, intensity is large) of pottery; The organic molecule that and high density grafting orderly at ceramic surface simultaneously has function machine group (different organic group has directed complexing and adsorption selection effect to dissimilar heavy metal ion) forms monolayer bonding, makes it have the ability of fabulous selective absorption target heavy metal ion.The selective height of preferred heavy-metal adsorption material heavy metal, adsorbance are large, and maximum heavy metal adsorption capacity can reach 400g/kg, and have good mechanical strength, safety non-toxic harmless, to environment non-secondary pollution, the renewable advantage such as to recycle.The nano-porous ceramic composite that the present invention adopts take nano-porous ceramic as carrier, the intensive monolayer of having modified containing active function groups of nano aperture inner surface; Its operation principle is the effect such as absorption, complexing, chelating utilizing the functional molecular heavy metal pollutant be attached in ceramic monolith nano aperture, and adsorbed and be trapped in heavy-metal adsorption material inside, heavy metal ion is fixed.
In preferred device, teeter column is provided with some screw blades.Screw blade is conducive to improving the mass-transfer efficiency in river bottom mud whipping process, improves mixed effect, is conducive to heavy metal release.
In preferred device, driving motor is arranged on seal closure outside.
In preferred device, gear transmission device is arranged on the middle position of circular top plate.
The device size of in-situ treatment river bottom mud of the present invention heavy metal pollution can be determined according to the amount of process bed mud, and general drum diameter is 0.1 ~ 2 meter, and corresponding primary sludge treating capacity is 0.1 ~ 8 cubic metre.
Present invention also offers a kind of method based on described device in-situ treatment river bottom mud heavy metal pollution, the method is vertically inserted in river bottom mud by the seal closure of described device, open driving motor, driving motor drives circular top plate to rotate by drive link, and the teeter column in circular top plate is uniformly mixed river bottom mud; Add heavy metallic activation agent from heavy metallic activation agent entrance simultaneously, promote leaching ability of heavy metal in bed mud, and adsorbed by the inwall heavy-metal adsorption material layer of seal closure cylinder.
In preferred method, heavy metallic activation agent is the citric acid solution of pH in 2.5 ~ 3.5 scopes; The consumption of the relative river bottom mud of described activator is 1 ~ 60L/ cubic meter; Be preferably 30 ~ 50L/ cubic meter.Debita spissitudo citric acid can promote the leaching ability of heavy metal in river bottom mud.
In preferred scheme, driving motor rotating speed controls at 60 ~ 100r/min.Suitable stir speed (S.S.) can be accelerated the abundant mixing of river bottom mud and be conducive to heavy metal ion and the heavy-metal adsorption material Contact-sorption of stripping.
In preferred scheme, mixing time is to process bed mud volume metering, and the mixing time of every cubic metre of bed mud is 1 ~ 30min relatively, is more preferably 15 ~ 25min.
In preferred scheme, after heavy metal adsorption is complete, when extracting seal closure from river bottom mud out, utilizes drive link circular top plate to be extruded downwards, smooth compaction treatment is carried out to the river bottom mud be uniformly mixed.Preferred advantageous, in being restored by the river bottom mud pattern after process, prevents river course downstream water secondary pollution.
In preferred scheme, the heavy-metal adsorption material layer having adsorbed heavy metal carries out wash-out by hydrochloric acid or EDTA solution and reclaims heavy metal.The process reclaiming heavy metal is to have adsorbed nano-porous ceramic composite hydrochloric acid or the EDTA eluant solution of heavy metal ion, obtains the solution containing heavy metal ion, and regeneration nano-porous ceramic composite is reused.Not only achieved the recovery of heavy metal by hydrochloric acid or EDTA solution, and nano-porous ceramic composite is regenerated, recycling, greatly reduces processing cost.The amount of the heavy metal that hydrochloric acid or EDTA solution concentration are adsorbed according to heavy metal absorbent suitably regulates.
Hinge structure, the Advantageous Effects that technical scheme of the present invention is brought:
1, the device of the in-situ treatment river bottom mud heavy metal pollution of the present invention's employing has good sealing, do not need to dam, the highly difficult construction such as cofferdam, in process river bottom mud heavy metal process, can not pollute downstream river, and process river sludge is in-situ treatment, can not destroy the original ecology in river course and large area takies place around river course.
2, device of the present invention is adopted fast, forever can to remove heavy metal in river bottom mud.
3, device of the present invention takes Modular assembled, and convenient operation, movement, maintenance, use cost is low.
4, process river bottom mud of the present invention heavy metal pollution method can continued operation, speed is fast, efficiency is high, equipment and operation do not need to take large area place, and cost of investment is low, are adapted to the river bottom mud heavy metal process of middle and small river.
5, technical scheme of the present invention not only can remove the heavy metal in river bottom mud, and can reclaim heavy metal, and resource is fully used; Nano-porous ceramic composite is renewable simultaneously, and recycling, greatly reduces processing cost.
Accompanying drawing explanation
[Fig. 1] is the device schematic diagram of in-situ treatment river bottom mud heavy metal pollution; 1 is seal closure, and 2 is cylindrical structure, and 3 is barrel top base plate, and 4 is heavy-metal adsorption material layer, and 5 is activator entrance, and 6 is driving motor, and 7 is drive link, and 8 is circular top plate, and 9 is gear transmission device, and 10 is teeter column, and 11 is screw blade;
The process chart that [Fig. 2] is the present patent application;
[Fig. 3] is nano-porous ceramic composite profile: 12 is nano-porous ceramic, and 13 is nano-pore, and 14 is the monolayer containing active function groups.
Detailed description of the invention
Following examples are intended to further illustrate content of the present invention, instead of the protection domain of restriction the claims in the present invention.
Fig. 1 is the device of in-situ treatment river bottom mud of the present invention heavy metal pollution; This device comprises seal closure 1 and stirring system; Described seal closure 1 is the semi-enclosed structure be made up of cylinder 2 and barrel top base plate 3, can directly insert in bed mud by the non-close end of cylinder 2 when processing river bottom mud, form closed system, and be arranged to zigzag bottom cylinder 2, for device fixing in river bottom mud; The inwall of described cylinder 2 is provided with heavy-metal adsorption material layer 4, and nano-porous ceramic composite is with nano-porous ceramic 12 for carrier, and nano-pore 13 inner surface is intensive has modified monolayer containing active function groups, is used for Adsorption of Heavy Metal Ions; Described base plate 3 is provided with heavy metallic activation agent entrance 5, in process bed mud process, is used for adding activator to cylinder 2 inside; Described stirring system comprises driving motor 6, drive link 7 and circular top plate 8, be connected by drive link 7 between driving motor 6 with circular top plate 8, be provided with gear transmission device 9 between drive link 7 and circular top plate 8, gear transmission device 9 is arranged on the middle position of circular top plate 8; It is inner that described circular top plate 8 is arranged on cylinder 2, and it is parallel with cylinder 2 top base plate 3, after driving motor 6 starts, circular top plate 8 is driven to rotate by drive link 7, and circular top plate 8 is provided with many group teeter columns 10, teeter column 10 pairs of bed muds stir, and teeter column 10 is at least provided with more than two, and teeter column 10 is provided with screw blade.
Be: vertically inserted in river bottom mud by the seal closure of described device open driving motor by the process of Fig. 1 device process river bottom mud, driving motor drives circular top plate to rotate by drive link, and the teeter column in circular top plate is uniformly mixed river bottom mud; Add heavy metallic activation agent from heavy metallic activation agent entrance simultaneously, promote leaching ability of heavy metal in bed mud, and adsorbed by the inwall heavy-metal adsorption material layer of seal closure cylinder; After heavy metal adsorption is complete, when extracting seal closure from river bottom mud out, utilizes drive link circular top plate to be extruded downwards, smooth compaction treatment is carried out to the river bottom mud be uniformly mixed.
Embodiment 1
In East Hunan bed mud in river, heavy metal cadmium content is 4.3mg/kg, Zn content is 652mg/kg, copper content is 210mg/kg, and select diameter to be the process cylinder unit of 0.5m, sorbing material is MA01, and disposable lignin-sludge amount is 0.78m
3, add the citric acid solution 40L that pH is 3.0, control driving motor 20min under the rotating speed of 80r/min.Multi-metal ion as MA01 absorption reaches capacity, can be after the EDTA eluant solution of 1.5wt% by MA01 concentration, reclaim heavy metal cadmium, zinc and copper, adsorption capacity after MA01 regeneration reaches 95% of original material, reusable, heavy metal ion amount as absorption does not reach capacity, and can continue to use;
To river bottom mud by after once managing, detect in bed mud in river heavy metal cadmium content is reduced to 0.5mg/kg, Zn content is reduced to 367mg/kg, copper content is reduced to 130mg/kg.Repeatedly process if repeated on this basis, in river bottom mud, the clearance of cadmium, zinc and copper can reach more than 95%.
Embodiment 2
Central Hunanprovince obtains that heavy metal cadmium content in bed mud is 8.6mg/kg, Zn content is 761mg/kg, copper content is 234mg/kg, and select diameter to be the process cylinder unit of 1m, sorbing material is MP01, and disposable lignin-sludge amount is 3.14m
3, add the citric acid solution 60L that pH is 3.0, control driving motor 30min under the rotating speed of 60r/min.If the multi-metal ion of MP01 absorption reaches capacity, can be after the hydrochloric acid wash-out of 10wt% by MP01 concentration, reclaim heavy metal cadmium, adsorption capacity after MP01 regeneration reaches 90% of original material, reusable, if the heavy metal ion amount of absorption does not reach capacity, can continue to use;
To river bottom mud by after single treatment, detect in bed mud in river heavy metal cadmium content is reduced to 1.4mg/kg, Zn content is reduced to 345mg/kg, copper content is reduced to 146mg/kg.Repeatedly process if repeated on this basis, in river bottom mud, the clearance of cadmium, zinc and copper can reach more than 95%.
Embodiment 3
In East Hunan bed mud in river, heavy metal cadmium content is 4.3mg/kg, lead content is 852mg/kg, Zn content is 662mg/kg, diameter is selected to be the process cylinder unit of 0.5m, sorbing material is MF01+MP01 (mass ratio 1:1), and disposable lignin-sludge amount is 0.78m
3, add the citric acid solution 20L that pH is 3.0, control driving motor 20min under the rotating speed of 80r/min.Heavy metal ion as MF01+ and MP01 absorption reaches capacity, can be after the EDTA eluant solution of 2.5wt% by MF01+ and MP01 concentration, reclaim heavy metal cadmium, lead and zinc, adsorption capacity after MF01+ and MP01 regeneration reaches 95% of original material, reusable, heavy metal ion as absorption does not reach capacity, and can continue to use;
To river bottom mud by after single treatment, detect in bed mud in river heavy metal cadmium content is reduced to 0.59mg/kg, lead content is reduced to 387mg/kg, Zn content is reduced to 284mg/kg.Repeatedly process if repeated on this basis, in river bottom mud, the clearance of cadmium, lead and zinc can reach more than 95%.
Embodiment 4
Various heavy metallic activation agent is to the experiment of heavy metal in soil Ion release Contrast on effect (to test containing heavy metal cadmium soil):
1, sampling spot: Hengdong County town, Hengyang City: soil Cd content 17mgkg
-1;
2, experiment reagent: heavy metallic activation agent: citric acid; Acetic acid; Tartaric acid; Ammonium acetate; Ammonium nitrate.
3, experimental procedure: 1), heavy metallic activation agent configuration: 0mmol/L, 1mmol/L, 5mmol/L, 10mmol/L, 15mmol/L, 20mmol/L five concentration gradients are set.2), take air-dry soil (crossing 80 mesh sieves) 20g and be placed in 250mL conical flask, according to soil: water=1:2.5, adds the agent of 50mL heavy metallic activation, then shake 30min on the oscillator, be filtered in plastic containers to be measured.
3), at various concentrations different heavy metallic activation agent on the impact of heavy metal-polluted soil Cd extraction efficiency:
Table 1 different heavy metallic activation agent variable concentrations is on the impact of heavy metal-polluted soil Cd extraction efficiency
| Ammonium nitrate | Citric acid | Acetic acid | Tartaric acid | Ammonium acetate | |
| ■0mmol/l | 2.31％ | 2.99％ | 2.01％ | 1.91％ | 1.81％ |
| ■1mmol/l | 7.90％ | 6.32％ | 12.86％ | 6.43％ | 5.44％ |
| ■5mmol/l | 18.87％ | 20.58％ | 23.36％ | 14.50％ | 8.93％ |
| ■10mmol/l | 40.61％ | 36.71％ | 32.12％ | 32.40％ | 12.04％ |
| ■15mmol/l | 43.86％ | 51.29％ | 36.35％ | 43.13％ | 16.24％ |
| ■20mmol/l | 45.63％ | 54.06％ | 45.76％ | 41.51％ | 21.96％ |
Citric acid, acetic acid, ammonium nitrate and tartaric acid have certain extraction effect to heavy metal-polluted soil Cd as known from Table 1, and ammonium acetate extraction effect is poor.Along with the raising of heavy metallic activation agent concentration, heavy metal-polluted soil Cd extraction yield is higher.When heavy metallic activation agent concentration is 5mmol/L, the extraction yield optimum of acetic acid is 23.36%; When heavy metallic activation agent concentration is 10mmol/L, the extraction yield optimum of ammonium nitrate is 40.61%; When heavy metallic activation agent concentration is 15mmol/L, the extraction yield of citric acid is 51.29%; When heavy metallic activation agent concentration is 20mmol/L, the extraction yield of citric acid is 54.06%.Under same concentrations, citric acid other heavy metallic activation agent relative has the effect better promoting heavy metal in soil stripping as can be seen from Table 1.
Embodiment 5
The regeneration tests of nano-porous ceramic composite:
MA01, MP01 and MF01 can regenerate with EDTA and HCl, and after wherein using EDTA regeneration, materials adsorption capacity can return to initial 95%, and after using regeneration of hydrochloric acid, materials adsorption capacity is initial 50%.Increase after vacuumizing, 70% of initial capacity can be returned to.Experiment flow and data as follows:
Experiment equipment and reagent:
Adopt MA01 nano-porous ceramic composite to be that example carries out test explanation, the 200ppm prepared is containing Cd waste water;
250mL triangular flask, 250mL beaker, 250mL graduated cylinder, 10mL pipette, dropper, vibration case, assay balance etc.;
1, experimental procedure:
1), with assay balance accurately take 30 parts of MA012.00g respectively in 30 cleaned 250mL triangular flasks, be numbered respectively 1. 2. 3.
2), with the 250mL graduated cylinder cleaned measure the 200ppm that 100mL prepared containing Cd waste water, in the triangular flask of 1, install 30 triangular flasks successively;
3), by the triangular flask of 2 put into vibration case to vibrate, rotating speed 130rpm, temperature is room temperature (about 21 DEG C), vibration 2h;
4) water sample of 3, is got in being composed of 1. 2. 3. ... test tube in 10mL, remaining heavy metal-containing waste water pours Sewage treatment bucket into, as far as possible to the greatest extent, sample censorship;
5), 10.0mL6mol/LHCl or 1.5%EDTA solution is got respectively to adding in the MA01 triangular flask after absorption with the pipette (separating when getting different liquids) of 10mL, and be placed in vibration case, 130rpm, room temperature (about 21 DEG C), vibration 1h;
6), by the regenerated liquid in the above-mentioned triangular flask of vibration wastewater collection place is poured into, as far as possible to the greatest extent;
7), with the material regenerated in clean water triangular flask, clean 5 times respectively, then clean 1 time with distilled water, vacuumize;
8), carry out adsorption test again, repeat 2 ~ 8;
Note: 1, above experiment completes in three batches; 2, in experimentation, Cd solution used is matching while using, and every batch of absorption Cd solution used is same, and measures the concentration of joined Cd solution during each measurement simultaneously;
Experiment knot results and analysis
Data are obtained as following table 2 by testing above:
Unit: mg/L
The absorption of table 2MA01 nano-porous ceramic composite heavy metal cadmium and desorption test data table
Note: A1 is solution C d concentration after absorption for the first time, and R1 is Cd concentration in the rear regenerated liquid of first time regeneration,
By that analogy.
Upper table data are performed an analysis, calculates adsorbance and desorption rate, obtain result as shown in table 3 below.
The absorption of table 3MA01 nano-porous ceramic material heavy metal cadmium and desorption test effect data
2. test result analysis
Adsorption effect, reaches as high as 79%, minimum 37%, average 57% for the first time;
In regeneration, EDTA effect better all can reach 95%;
HCl effect is general, and the adsorbance in regenerative process is about primary 50%.
Claims (10)
1. a device for in-situ treatment river bottom mud heavy metal pollution, is characterized in that: comprise seal closure and stirring system; Described seal closure is the semi-enclosed structure be made up of cylinder and barrel top base plate, and the inwall of described cylinder is provided with heavy-metal adsorption material layer, and described base plate is provided with heavy metallic activation agent entrance; Described stirring system comprises driving motor, drive link and circular top plate, is connected between driving motor with circular top plate by drive link, and drive link and circular top plate junction are provided with gear transmission device; Described circular top plate is arranged on cylinder interior, and parallel with barrel top base plate, described circular top plate is provided with vertically downward at least two group teeter columns.
2. the device of in-situ treatment river bottom mud according to claim 1 heavy metal pollution, is characterized in that: described bottom of cylinder barrel is arranged to zigzag.
3. the device of in-situ treatment river bottom mud according to claim 1 heavy metal pollution, is characterized in that: described heavy-metal adsorption material layer is made up of at least one in nano-porous ceramic composite MA01, MF01 and MP01.
4. the device of in-situ treatment river bottom mud according to claim 1 heavy metal pollution, is characterized in that: described teeter column is provided with some screw blades.
5. the device of in-situ treatment river bottom mud according to claim 1 heavy metal pollution, is characterized in that: described driving motor is arranged on seal closure outside.
6. based on the method for the device in-situ treatment river bottom mud heavy metal pollution described in any one of Claims 1 to 5, it is characterized in that: the seal closure of described device is vertically inserted in river bottom mud, open driving motor, driving motor drives circular top plate to rotate by drive link, and the teeter column in circular top plate is uniformly mixed river bottom mud; Add heavy metallic activation agent from heavy metallic activation agent entrance simultaneously, promote leaching ability of heavy metal in bed mud, and adsorbed by the inwall heavy-metal adsorption material layer of seal closure cylinder.
7. the method for device in-situ treatment river bottom mud according to claim 6 heavy metal pollution, is characterized in that: described heavy metallic activation agent is the citric acid solution of pH in 2.5 ~ 3.5 scopes; The consumption of the relative river bottom mud of described activator is 1 ~ 60L/ cubic meter.
8. the method for device in-situ treatment river bottom mud according to claim 6 heavy metal pollution, is characterized in that: described driving motor rotating speed controls at 60 ~ 100r/min; The time be uniformly mixed, the time that is uniformly mixed of every cubic metre of bed mud was 1 ~ 30min relatively to process bed mud volume metering.
9. the method for device in-situ treatment river bottom mud according to claim 1 heavy metal pollution, is characterized in that: the heavy-metal adsorption material layer having adsorbed heavy metal carries out wash-out by hydrochloric acid or EDTA solution and reclaims heavy metal.
10. the method for device in-situ treatment river bottom mud according to claim 6 heavy metal pollution, it is characterized in that: after heavy metal adsorption is complete, when extracting seal closure from river bottom mud out, utilize drive link circular top plate to be extruded downwards, smooth compaction treatment is carried out to the river bottom mud be uniformly mixed.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108480380A (en) * | 2018-03-26 | 2018-09-04 | 哈尔滨工业大学 | A kind of ultrasound depth elutes original position and the dystopy solonchak restorative procedure of coupled nanosecond rock composite modifying agent |
| CN112158938A (en) * | 2020-09-24 | 2021-01-01 | 湖南诚至环保科技有限公司 | River course heavy metal treatment system |
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| CN113358591A (en) * | 2021-07-09 | 2021-09-07 | 王春莲 | Edible fungus detection metal detection device for food quality safety detection |
| CN113358591B (en) * | 2021-07-09 | 2023-01-31 | 王春莲 | Edible fungus detection metal detection device for food quality safety detection |
| WO2023221518A1 (en) * | 2022-05-20 | 2023-11-23 | 长江水利委员会长江科学院 | Apparatus and method for accelerating release and recycling of endogenous phosphorus from eutrophic water body |
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