CN106430365B - A kind of Zero-valent Iron activator sustained release candle for in-situ remediation of underground water - Google Patents
A kind of Zero-valent Iron activator sustained release candle for in-situ remediation of underground water Download PDFInfo
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- CN106430365B CN106430365B CN201611062038.7A CN201611062038A CN106430365B CN 106430365 B CN106430365 B CN 106430365B CN 201611062038 A CN201611062038 A CN 201611062038A CN 106430365 B CN106430365 B CN 106430365B
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- iron
- activator
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- candle
- valent iron
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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
- C02F1/00—Treatment of water, waste water, or sewage
Abstract
The invention discloses a kind of Zero-valent Iron activator for in-situ remediation of underground water to be sustained candle, the Zero-valent Iron activator is sustained candle and is made of activator, the dispersing agent of 5%-15% and the coagulator of 15%-25% that mass percent is 65%-75%, in which: activator is made of zeroth order iron powder and high-iron fly ash.The present invention can be used for long term activation persulfate to groundwater environment slow release ferrous ion；And have the function of that magnetic iron ore promotes Zero-valent Iron activation persulfate, so as to be suitable for the organic contamination place underground water in-situ oxidation reparation of different persulfates activation demand.
Description
Technical field
The present invention relates to groundwater remediation technical field, specifically a kind of Zero-valent Iron for in-situ remediation of underground water is activated
Agent is sustained candle.
Background technique
Ferrous salt is cheap and easy to get and high effect nontoxic, becomes the transition metal for studying most commonly used activation persulfate at present
Ion, research shows that: at normal temperatures and pressures, Zero-valent Iron, ferrous iron, ferric iron and magnetic iron ore, bloodstone, ferrous sulfide and Huang
The iron-bearing minerals such as iron ore can be catalyzed the potentiometric titrations that persulfate generates strong oxidizing property, thus organic in water body of degrading
Pollutant, such as: chlorohydrocarbon, nitrobenzene, petroleum hydrocarbon etc..
But when using ferrous activation persulfate, ferrous iron reacts the speed mistake for generating potentiometric titrations with persulfate
Fastly, it is unfavorable for potentiometric titrations to react with organic pollutant: and can occur in system ferrous anti-with potentiometric titrations
It answers, the ferrous inhibitor for becoming potentiometric titrations excessive at this time is serious to hinder in-situ oxidation remediation efficiency.
Therefore there is scholar to propose to replace ferrous offer ferrous ion with Zero-valent Iron, to activate persulfate.Acid and close
Under conditions of neutrality, Zero-valent Iron, to control the content of solution ferrous ions, can be reduced secondary anti-with slow release ferrous ion
The generation answered improves persulfate utilization rate, proves that above-mentioned measure is feasible and effective by correlative study.In addition, zeroth order
The reducing agent of iron inherently reduction reaction, can independent deoxidization, degradation organic pollutant.
It is existing research it is in the majority using nano zero valence iron as activator, but for in-situ oxidation reparation underground water when, still have
Following problems:
1. nano zero valence iron is passivated quickly, drop to the reaction rate of system with unactivated system same order.
2. due to the magnetism of Van der Waals force and iron itself, along with the surface of the huge specific surface area of nano material itself
Can, make nano zero-valence iron particle be easy to reunite, to affect its transmission and reactivity in underground water.
Therefore, researcher activated using the materials such as Tween-20, active carbon, polyvinyl alcohol cladding nano zero valence iron
Sulfate, to solve the above problems.
Summary of the invention
It is an object of the invention to solve the problems in above-mentioned background technique and deficiency, one kind is provided for in-situ immobilization
The Zero-valent Iron activator sustained release candle being lauched.
To achieve the above object, a kind of Zero-valent Iron activator for in-situ remediation of underground water provided by the invention is sustained wax
Candle is activator, the dispersing agent of 5%-15% and the coagulator group of 15%-25% that be cylindric, being 65%-75% by mass percent
At,
A kind of Zero-valent Iron activator for in-situ remediation of underground water is sustained candle, wherein activator is by quality
Than zeroth order iron powder and the high-iron fly ash composition for 8-11:1.
The zeroth order iron powder is the zeroth order iron powder that granularity is -100 mesh of 60 mesh.
The high-iron fly ash is that iron content is 35%-50%, and granularity is the flyash of -150 mesh of 100 mesh.
A kind of Zero-valent Iron activator for in-situ remediation of underground water is sustained candle, wherein dispersing agent is granularity
For the flyash of -100 mesh of 20 mesh.
A kind of Zero-valent Iron activator for in-situ remediation of underground water is sustained candle, wherein coagulator is fusing point
Fully refined paraffin wax within the scope of 50 DEG C -64 DEG C.
A kind of Zero-valent Iron activator for in-situ remediation of underground water is sustained candle, wherein Zero-valent Iron activator
The shape for being sustained candle is cylinder, and diameter is 1.5 cm -4cm, and length is the cylinder of 5-15cm.
The method provided by the invention for preparing above-mentioned Zero-valent Iron activator sustained release candle, key step are as follows:
(1) by coagulator: fully refined paraffin wax, mass ratio 15%-25% are placed in 500 mL beakers, place the beaker 70 DEG C-
In 75 DEG C of thermostat water bath, heating is until coagulator is completely melt；
(2) by activator agent: the mass ratio of mass ratio 65%-75%, zeroth order iron powder and high-iron fly ash is 8-11:1；Dispersion
Agent: flyash, mass ratio 5%-15%；It is sequentially added in the coagulator being completely melt；
(3) by above-mentioned Zero-valent Iron activator slow-release material mixture in constant temperature electric magnetic blender, 150r/min turns
Speed stirring 30min, and 20min is stirred by ultrasonic in thermostatic ultrasonic cleaning machine；
(4) above-mentioned well-mixed Zero-valent Iron activator slow-release material mixture is poured into rapidly diameter is 1 cm-
4cm, length are in the cylindrical candle mold of 5-15cm；
(5) mixed to Zero-valent Iron activator slow-release material by cylindrical candle mold rapidly as 30min static in ice-water bath
After zoarium is cooled and shaped, it is removed from the molds and is sustained candle sample to get to Zero-valent Iron activator.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention firstly provides prepare Zero-valent Iron jointly using zeroth order iron powder, high-iron fly ash, flyash and paraffin to swash
Agent living is sustained candle, in which: zeroth order iron powder and high-iron fly ash are as activator, and flyash is as dispersing agent, and paraffin is as solidifying
Gu agent.
(2) present invention using zeroth order iron powder as main activator raw material, in the case that persulfate oxidation agent there are,
Long term activation persulfate can be used for groundwater environment slow release ferrous ion.Zeroth order iron powder can be in sustained release candle
Portion provides reducing condition, prevents ferric ion, and then avoids that ferric hydroxide precipitate is precipitated, and improves the permeable reaction in underground
Wall prevents blocking ability.High-iron fly ash contains a large amount of magnetic iron ores, and high-iron fly ash has single activation persulfuric acid ability,
When being used to prepare Zero-valent Iron activator sustained release candle, plays the role of promoting activation persulfate, promote activation persulfate ability.
(3) present invention can be by adjusting dispersing agent granularity, the sustained release channel sized of control sustained release candle, and then controls slow
The activator rate of release of candle is released, to adapt to activate different persulfate concentration needs, so that application range is more extensive.
(4) shape and specification size that the present invention can be sustained candle by adjusting Zero-valent Iron activator, are prepared into and are conducive to
The sustained release agent modular assembly of replacement, and it is used for different reparation scenes.
(5) present invention can be used cooperatively with persulfate sustained release agent, repair benzene homologues, polycyclic virtue for in-situ oxidation
The organic contaminations underground water such as hydrocarbon, chlorohydrocarbon and petroleum hydrocarbon has preferable repairing effect and long-time stability.
(6) present invention is conveniently replaceable, and dispersing agent, coagulator can recycle, and be reused for after reaching service life
Prepare slow-release material.
(7) present invention used in low in raw material price, in which: paraffin, flyash can reuse, production cost compared with
It is low, it is suitable for comprehensive promotion and application.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, and following embodiment is to of the invention
It explains.
Embodiment 1
According to following activator, dispersing agent, the percent mass ratio of coagulator, specification, zeroth order is prepared with abovementioned steps
Iron activator is sustained candle.Activator: zeroth order iron powder, high-iron fly ash mass ratio be 10:1, mass ratio 75%, 63.4g；
Dispersing agent: flyash, mass ratio 10%, -40 mesh of 20 mesh, 8.4g；Coagulator: fully refined paraffin wax, mass ratio 15%, fusing point 60
DEG C, 12.7g；Prepared Zero-valent Iron activator is sustained candle specification are as follows: diameter 2cm, length 5cm.
Embodiment 2
According to following activator, dispersing agent, the percent mass ratio of coagulator, specification, zeroth order is prepared with abovementioned steps
Iron activator is sustained candle.Activator: zeroth order iron powder, high-iron fly ash mass ratio be 10:1, mass ratio 70%, 112g；Point
Powder: flyash, mass ratio 10%, -60 mesh of 32 mesh, 16g；Coagulator: fully refined paraffin wax, mass ratio 20%, 60 DEG C of fusing point,
32g；Prepared Zero-valent Iron activator is sustained candle specification are as follows: diameter 2cm, length 10cm.
Embodiment 3
According to following activator, dispersing agent, the percent mass ratio of coagulator, specification, zeroth order is prepared with abovementioned steps
Iron activator is sustained candle.Activator: zeroth order iron powder, high-iron fly ash mass ratio be 11:1, mass ratio 65%, 27.9g；
Dispersing agent: flyash, mass ratio 10%, -60 mesh of 32 mesh, 4.3g；Coagulator: fully refined paraffin wax, mass ratio 25%, fusing point 60
DEG C, 10.7g；Prepared Zero-valent Iron activator is sustained candle specification are as follows: diameter 1.5cm, length 5cm.
Embodiment 4
According to following activator, dispersing agent, the percent mass ratio of coagulator, specification, zeroth order is prepared with abovementioned steps
Iron activator is sustained candle.Activator: zeroth order iron powder, high-iron fly ash mass ratio be 9:1, mass ratio 65%, 592g；Point
Powder: flyash, mass ratio 15%, -100 mesh of 50 mesh, 136g；Coagulator: fully refined paraffin wax, mass ratio 20%, fusing point 60
DEG C, 182g；Prepared Zero-valent Iron activator is sustained candle specification are as follows: diameter 4cm, length 15cm.
Embodiment 5
The NEN7375 standard organized to set up using EU criteria is sustained wax to Zero-valent Iron activator prepared by embodiment 1
Candle carries out leaching test, and leaching liquor is deoxygenation ultrapure water, and volume 500mL adds the persulfuric acid of 1g/L in experimental group leaching liquor
Salt, while control group is arranged in parallel, persulfate is not added in control group leaching liquor；It replaces and extracts according to standard leaching stage
Liquid, and the total iron concentration of sampling and testing.The result shows that: total iron concentration is 367mg/L, 4d leaching in experimental group 1d leachate
Total iron concentration is 548mg/L in liquid out, and total iron concentration is 692 mg/L in 16d leachate；And control group is in 16d
Total iron concentration is 0.6-3.5mg/L in leachate.
Embodiment 6
The NEN7375 standard organized to set up using EU criteria is sustained wax to Zero-valent Iron activator prepared by embodiment 1
Candle carries out leaching test, and leaching liquor is deoxygenation ultrapure water, and volume 500mL adds the persulfuric acid of 2g/L in experimental group leaching liquor
Salt, while control group is arranged in parallel, persulfate is not added in control group leaching liquor；It replaces and extracts according to standard leaching stage
Liquid, and the total iron concentration of sampling and testing.The result shows that: total iron concentration is 875mg/L, 4d leaching in experimental group 1d leachate
Total iron concentration is 1358mg/L in liquid out, and total iron concentration is 1543 mg/L in 16d leachate；And control group is in 16d
Total iron concentration is 0.7-4.3mg/L in interior leachate.
Embodiment 7
The NEN7375 standard organized to set up using EU criteria is sustained wax to Zero-valent Iron activator prepared by embodiment 3
Candle carries out leaching test, and leaching liquor is deoxygenation ultrapure water, and volume 500mL adds the persulfuric acid of 2g/L in experimental group leaching liquor
Salt, while control group is arranged in parallel, persulfate is not added in control group leaching liquor；It replaces and extracts according to standard leaching stage
Liquid, and the total iron concentration of sampling and testing.The result shows that: total iron concentration is 318mg/L, 4d leaching in experimental group 1d leachate
Total iron concentration is 761mg/L in liquid out, and total iron concentration is 964mg/L in 16d leachate；And control group is in 16d
Total iron concentration is 0.5-3.2mg/L in leachate.
Embodiment described above is only several in many embodiments of the present invention, but protection scope of the present invention is not
It is confined to this.Subject to the scope of protection of the claims, any those skilled in the art of the present technique's protection scope of the present invention exist
In the technical scope of present disclosure, any changes or substitutions that can be easily thought of, is all included within the scope of the present invention.
Claims (4)
1. a kind of Zero-valent Iron activator for in-situ remediation of underground water is sustained candle, it is characterised in that be by mass percent
The coagulator of the activator of 65%-75%, 10% dispersing agent and 15%-25% forms；The activator is 10-11 by mass ratio:
1 zeroth order iron powder and high-iron fly ash composition；The dispersing agent is the flyash that granularity is -100 mesh of 20 mesh；The solidification
Agent is fully refined paraffin wax of the fusing point within the scope of 50 DEG C -64 DEG C.
2. a kind of Zero-valent Iron activator for in-situ remediation of underground water according to claim 1 is sustained candle, feature
It is, the zeroth order iron powder is the zeroth order iron powder that granularity is -100 mesh of 60 mesh.
3. a kind of Zero-valent Iron activator for in-situ remediation of underground water according to claim 1 is sustained candle, feature
It is, the high-iron fly ash is that iron content is 35%-50%, and granularity is the flyash of -150 mesh of 100 mesh.
4. a kind of Zero-valent Iron activator for in-situ remediation of underground water according to claim 1 is sustained candle, feature
It is, it is 1.5 cm -4cm that the Zero-valent Iron activator sustained release candle, which is diameter, and length is the cylinder of 5-15cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611062038.7A CN106430365B (en) | 2016-11-28 | 2016-11-28 | A kind of Zero-valent Iron activator sustained release candle for in-situ remediation of underground water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611062038.7A CN106430365B (en) | 2016-11-28 | 2016-11-28 | A kind of Zero-valent Iron activator sustained release candle for in-situ remediation of underground water |
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| CN106430365A CN106430365A (en) | 2017-02-22 |
| CN106430365B true CN106430365B (en) | 2019-11-12 |
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| CN112374596B (en) * | 2020-09-14 | 2023-04-07 | 浙江工商大学 | Formable nanometer zero-valent iron slow-release agent, preparation method thereof and application thereof in-situ remediation of groundwater and soil heavy metal pollution |
| CN115746863A (en) * | 2022-10-28 | 2023-03-07 | 湖南大学 | Halloysite nanotube-based oxidant sustained-release capsule and preparation method and application thereof |
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