CN105923963A - In-situ activity coverage repairing method for persistent organic pollutants in deposited matters - Google Patents
In-situ activity coverage repairing method for persistent organic pollutants in deposited matters Download PDFInfo
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- CN105923963A CN105923963A CN201610425389.3A CN201610425389A CN105923963A CN 105923963 A CN105923963 A CN 105923963A CN 201610425389 A CN201610425389 A CN 201610425389A CN 105923963 A CN105923963 A CN 105923963A
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- magnetic
- deposit
- activated carbon
- covers
- original position
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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
- C02F11/02—Biological treatment
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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
Abstract
The invention discloses an in-situ activity coverage repairing method for persistent organic pollutants in deposited matters. In the method, magnetic particle activated carbon is used as a coverage material, not only can effectively fix the persistent organic pollutants (POPs) in the deposited matters, but also has features of in-situ conversion and POPs degradation. According to the coverage method, by control of magnetizing and demagnetizing of an underwater electric permanent magnet chuck, a thin-layer alternate coverage mode of the magnetic particle activated carbon is realized, and mounting and replacing of the coverage material are facilitated; by a movable enclosure frame, influence of flow velocity of water to coverage is reduced; and by a mode of combining an underwater electric permanent magnetic chuck and an underwater imaging instrument, orientation, positioning and uniform coverage of the polluted deposited matters are realized, and adverse effects of overlying water in an in-situ coverage process are reduced effectively.
Description
Technical field
The invention belongs to contaminated sediment remediation recovery technique field, being specifically related to a kind of employing can the activity of Magnetic Isolation cover
Cover material home position strengthening repairs the technology of persistence organic pollutant in deposit, is particularly well-suited to by persistence organic pollutant
The reparation of with serious pollution river, estuary of the lake and lake sediment.
Background technology
Persistence organic pollutant (POPs) because of its have be difficult to degraded, can long-distance transmissions, bioaccumulation, carcinogenic cause
The characteristic such as mutability and endocrine disruption, lake, river pollution problem that these compounds are caused have caused various countries' science
Boundary, the highest attention of government and street levels.Therefore effectively control and repair POPs in deposit to pollute, water body environment quality is improved
It is particularly important with urgent.At present to the control of POPs in water body deposit and reparation, mainly use dredging, in situ covering with
And the mode of controlled clear-cutting forestland technology.Though dredging instant effect, but marine sediments are easily caused to rise and to pollution deposit
The secondary pollution problems such as thing follow-up strange land disposal.Compared with dredging technology and controlled clear-cutting forestland technology, soverlay technique tool in situ
There are less ecological risk and good repairing effect.At present, the covering material of use mainly has natural material, such as sinking of cleaning
Long-pending thing, soil, sand, gravel etc., wherein sand is the most commonly used material.Natural zeolite and river sand can also be used (as specially
Profit document CN102531197B disclosed " bioactive multilayer covering remediation method for contaminated sediment "), ferrihydrite, calcite,
Geotextiles and local river sand (as disclosed in patent documentation CN103613257A " the activity covering side for deposit in-situ immobilization
Method ") and iron tailings granule and cement (as disclosed in patent documentation CN102775035B " rivers and lakes heavy metal polluted bed mud
In-situ covering method and device ") etc..Although these cover materials can effective fixed-contamination thing, but do not possess contaminant degradation
Ability, and the organic carbon content of material own is low, limited sorption capacity.And currently used more activity covers material, such as activity
, with efficient absorption and fixed-contamination thing, but the saturated rear effect of POPs absorption can be there is and substantially reduces, actual application there is also in charcoal
Separate difficult problem, and aquatic ecosystem is had a negative impact by the long-term existence of activated carbon.For can the magnetic of Magnetic Isolation
Property activated carbon use, be focused only on Adsorption Organic Pollutants in Wastewater at present, heavy metal and gold extract.Additionally,
The coverage mode of soverlay technique mainly has in situ: mobile barge top layer dispenses mode, water-jet Surface mulch mode and machine
Mode etc. is toppled on tool equipment top layer.Covering material is only directly inclined and is sprinkling upon the surface of contaminated sediment remediation by these coverage modes, is subject to
The impact of current is difficulty with being completely covered and orienting, position covering.And directly incline spread covering material be easily caused contaminated
Sediment resuspension, adversely affects water quality.
Summary of the invention
For prior art existing defects or deficiency, it is an object of the invention to provide persistency in a kind of deposit has
The original position activity of organic pollutants covers restorative procedure, and the method is capable of efficiently catching of persistence organic pollutant in deposit
Obtain, converted in-situ and degraded and the feature of Magnetic Isolation, and it is easily installed and replaced to cover material, it is achieved marine sediments
Orientation, location, uniform fold and interlaminate coverage mode.
The present invention uses activity in situ to cover material, uses contaminated sediment remediation and interlaminates coverage mode, by adopting
The orientation of marine sediments, location uniform fold is realized by electric permanent-magnet suction disc release under water and Underwater Imaging instrument combination mode
Repair, realize especially by techniques below scheme:
(1) select magnetic-particle activated carbon as the covering material of marine sediments.
Described granular active carbon is ature of coal column-shaped active carbon, particle diameter 1.5 mm.
Described magnetic-particle activated carbon is to be composited by ature of coal column-shaped active carbon and ferroferric oxide magnetic fluid: will
FeSO4•7H2O and FeCl3•6H2O presses (Fe2+: Fe3+) mol ratio is that the ratio of 1:2 is dissolved in deionized water, adds ature of coal column
Activated carbon, is allowed to be sufficiently mixed.Under the conditions of 70 DEG C, magnetic agitation is slowly added dropwise sodium hydroxide solution, makes the solution ph be
10-11, magnetic agitation 1-2 hour, then magnetic agitation are reacted 8 hours, remove supernatant, obtain black precipitate, use deionization
Water and dehydrated alcohol clean repeatedly.After ethanol volatilizees, under the conditions of 60 DEG C, it is dried black precipitate 24 hours, then uses magnetic force
Magnetic-particle activated carbon collected by rod, and the magnetic-particle activated carbon collected is dried 16 hours under the conditions of 80 DEG C.
(2) contaminated sediment remediation employing is interlaminated coverage mode.The cladding thickness of magnetic-particle activated carbon is for covering
In deposit top layer 2-5 mm.After first thin layer covers, treat that magnetic-particle activated carbon is obvious to POPs stress efficacy in deposit
During reduction, use Magnetic Isolation to take out magnetic-particle activated carbon from marine sediments, again cover new magnetic-particle activity
Charcoal.
(3) electric permanent-magnet suction disc release and Underwater Imaging instrument combination mode under water is used to realize determining of marine sediments
To, location all standing.
Described uses electric permanent-magnet suction disc release under water, uses magnetizing and demagnetizing controller to control, and is only filling demagnetized state conversion
Time be passed through instantaneous power, work process no longer electricity consumption, the middle work magnetic force that works after magnetizing is not by power failure shadows such as system cut-offs
Ringing, after demagnetization, table top remanent magnetism is clean, can realize quick Stress Release magnetic-particle activated carbon.
Described Underwater Imaging instrument is that high-definition intelligent rotates underwater camera, is arranged on above mobile framework, in order to right
Coverage condition detects.Described mobile framework is the enclosure baffle plate that can move up and down, and reduces water volume flow rate to covering
Impact.
Use the good effect of technique scheme: magnetic-particle activated carbon not only has preferably absorption and separates effect
Really, and magnetisable material exists and enhances the chemical oxidation of POPs, adds the biological effectiveness of POPs in deposit, is conducive to
Follow-up microbial degradation.Magnetic iron ore can substitute for the pili of ground bacillus and realizes the function that extracellular microbial exoelectron transmits at a distance,
Strengthen function further the ability of gene cell pigment c electron transmission.And, activated carbon can also be as electron acceptor or electricity
Electron transfer process, under anaerobic bioconversion POPs between the mediation microorganism of sub-shuttle body and magnetic iron ore.As can be seen here,
In marine sediments cover magnetic-particle activated carbon be equivalent in deposit, add one can be with the electronics of Magnetic Isolation
Receptor, thus it has been internally formed microbial metabolism new way at deposit.POPs stress efficacy in covering material is to deposit
During reduction, the covering material possessing Magnetic Isolation is easy to again cover and replace.Cover material to use electromagnetic releasing and become under water
As compound mode realizes the orientation of marine sediments, location all standing, reduce marine sediments settling flux and water quality is made
Become adverse influence.
Accompanying drawing explanation
Fig. 1. the magnetic-particle activated carbon of preparation.
Fig. 2. the content of polycyclic aromatic hydrocarbons in sediments (PAHs) is with the change of cover time.
Fig. 3. in the deposit of the present invention, the original position activity of persistence organic pollutant covers the structural representation of restorative procedure
Figure；Wherein: 1, under water with electric permanent-magnet suction disc, 2, magnetizing and demagnetizing controller, 3, magnetic-particle activated carbon, 4, framework, 5, Underwater Imaging
Instrument.
Detailed description of the invention
It is further described technical scheme below in conjunction with concrete drawings and Examples.
Embodiment 1
The preparation of magnetic-particle activated carbon: weigh 3.140 g FeSO respectively4•7H2O and 6.105 g FeCl3•6H2O is dissolved in
100 mL deionized waters, add 4.5 g ature of coal column-shaped active carbons, are allowed to be sufficiently mixed.Under the conditions of 70 DEG C, magnetic agitation is slow
Being added dropwise over 5 mol/L sodium hydroxide solutions, making solution ph is 10-11, magnetic agitation 1-2 hour, then magnetic agitation reaction 8
Hour, remove supernatant, obtain black precipitate, repeatedly clean with deionized water and dehydrated alcohol.After ethanol volatilizees, 60
It is dried black precipitate 24 hours under the conditions of DEG C, then uses magnetic bar to collect magnetic-particle activated carbon, the magnetic-particle collected
Activated carbon is dried 16 hours under the conditions of 80 DEG C.The magnetic-particle activated carbon of preparation is as shown in Figure 1.Measure granular active carbon and
Specific surface area and the average pore volume of magnetic-particle activated carbon are as shown in table 1.The specific surface area of granular active carbon and aperture are respectively
487.361 m2/g、2.619 nm；By comparison, the specific surface area of magnetic-particle activated carbon reduces, aperture increases relatively.Show
Most of micropore of activated carbon is occupied by magnetic component, and the filling of magnetic component increases aperture, is successfully prepared magnetic mesoporous
Granular active carbon, and preparation composite there is preferable magnetic property (such as Fig. 1).
Table 1. granular active carbon and the pore property of magnetic-particle activated carbon
Embodiment 2
Gather the S & W sample in the high region (such as East Taihu Lake flood port) of lake river mouth district POPs content.Research magnetic-particle
The interpolation of the activated carbon conversion usefulness to polycyclic aromatic hydrocarbons in sediments (PAHs).Use 150 mL glass cultivate roller bottles, each instead
Add 80 g wet deposition things and 50 mL overlying waters in answering bottle, set different disposal group: be not added with the heavy of magnetic-particle activated carbon
Long-pending thing is as a control group；Other process group adds 3.6% magnetic-particle activated carbon (based on deposit dry weight).Glass is cultivated rolling
In bottle is positioned over roller bottle incubator, (rolling speed about 3 rpm) cultivates.Using destructive sample mode, the sampling time is respectively 0
D, 25 d, 68 d, 95 d, 115 d.Measure the PAHs content (such as Fig. 2) of residual in deposit.Test through 95 d, deposit
The clearance of middle PAHs is up to more than 90%.During 115 d, magnetic-particle activated carbon presents reduction to PAHs stress efficacy in deposit
Phenomenon.Therefore, marine sediments use after covering about 3 months in position and interlaminate coverage mode, and Magnetic Isolation is original
Magnetic-particle activated carbon, covers new magnetic-particle activated carbon again.
Embodiment 3
Fig. 3 gives the original position activity of persistence organic pollutant in the deposit of the present invention and covers the structural representation of restorative procedure
Figure.Being in, with electric permanent-magnet suction disc 1, the state of magnetizing under water when covering in situ, magnetic-particle activated carbon 3 adsorbs firmly at electricity permanent magnetism
The bottom of sucker 1.In a covering point position, the mobile framework 4 of release downwards, covering point is carried out enclosing and can effectively reduce water body stream
The speed impact on covering, controls 2 according to the image frame implementing demagnetization of Underwater Imaging instrument 5 feedback, it is ensured that magnetic-particle is lived simultaneously
Property charcoal uniformly, smoothly covers the top layer in marine sediments.
Claims (10)
1. in a deposit, the original position activity of persistence organic pollutant covers restorative procedure, it is characterised in that: described method
Use activity in situ to cover material, contaminated sediment remediation is used and interlaminates coverage mode, by using electricity permanent magnetism under water to inhale
Dish release and Underwater Imaging instrument combination mode realize the orientation of marine sediments, location uniform fold reparation.
In a kind of deposit the most according to claim 1, the original position activity of persistence organic pollutant covers restorative procedure,
It is characterized in that: it is magnetic-particle activated carbon that described original position activity covers material.
In a kind of deposit the most according to claim 2, the original position activity of persistence organic pollutant covers restorative procedure,
It is characterized in that: after first thin layer covers, treat that magnetic-particle activated carbon is to persistence organic pollutant stress efficacy in deposit
When substantially reducing, use Magnetic Isolation to take out magnetic-particle activated carbon from marine sediments, again cover new magnetic-particle
Activated carbon.
In a kind of deposit the most according to claim 2, the original position activity of persistence organic pollutant covers restorative procedure,
It is characterized in that: described magnetic-particle activated carbon is to be composited by ature of coal column-shaped active carbon and ferroferric oxide magnetic fluid.
In a kind of deposit the most according to claim 4, the original position activity of persistence organic pollutant covers restorative procedure,
It is characterized in that: the described concrete complex method of magnetic-particle activated carbon is as follows: by FeSO4•7H2O and FeCl3•6H2O presses (Fe2 +: Fe3+) mol ratio is that the ratio of 1:2 is dissolved in deionized water, add ature of coal column-shaped active carbon, be allowed to be sufficiently mixed；At 70 DEG C
Under the conditions of magnetic agitation be slowly added dropwise sodium hydroxide solution, making solution ph is 10-11, magnetic agitation 1-2 hour, then magnetic
Power stirring reaction 8 hours, removes supernatant, obtains black precipitate, repeatedly clean with deionized water and dehydrated alcohol；Treat ethanol
After volatilization, under the conditions of 60 DEG C, it is dried black precipitate 24 hours, then uses magnetic bar to collect magnetic-particle activated carbon, collect
Magnetic-particle activated carbon dry 16 hours under the conditions of 80 DEG C.
In described a kind of deposit the most according to claim 4, the original position activity of persistence organic pollutant covers reparation side
Method, it is characterised in that: the particle diameter of described ature of coal column-shaped active carbon is 1.5 mm.
In described a kind of deposit the most according to claim 2, the original position activity of persistence organic pollutant covers reparation side
Method, it is characterised in that: the cladding thickness of magnetic-particle activated carbon is for being covered in deposit top layer 2-5 mm.
In described a kind of deposit the most according to claim 1, the original position activity of persistence organic pollutant covers reparation side
Method, it is characterised in that: described uses electric permanent-magnet suction disc release under water, uses magnetizing and demagnetizing controller to control, is only filling demagnetization shape
It is passed through instantaneous power, work process no longer electricity consumption during state conversion.
In a kind of deposit the most according to claim 1, the original position activity of persistence organic pollutant covers restorative procedure,
It is characterized in that: described Underwater Imaging instrument is that high-definition intelligent rotates underwater camera, is arranged on above mobile framework.
In a kind of deposit the most according to claim 9, the original position activity of persistence organic pollutant covers restorative procedure,
It is characterized in that: described mobile framework is the enclosure baffle plate moved up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610425389.3A CN105923963B (en) | 2016-06-16 | 2016-06-16 | The activity covering restorative procedure in situ of persistence organic pollutant in a kind of deposit |
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| CN201610425389.3A CN105923963B (en) | 2016-06-16 | 2016-06-16 | The activity covering restorative procedure in situ of persistence organic pollutant in a kind of deposit |
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| CN105923963B CN105923963B (en) | 2019-08-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113732003A (en) * | 2021-09-06 | 2021-12-03 | 杨文超 | Activated carbon cap disposal method for heavy metal polluted dredged materials |
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| CN105923963B (en) | 2019-08-30 |
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