CN106477648B - A kind of persulfate sustained release candle for in-situ remediation of underground water - Google Patents
A kind of persulfate sustained release candle for in-situ remediation of underground water Download PDFInfo
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- CN106477648B CN106477648B CN201611061740.1A CN201611061740A CN106477648B CN 106477648 B CN106477648 B CN 106477648B CN 201611061740 A CN201611061740 A CN 201611061740A CN 106477648 B CN106477648 B CN 106477648B
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- Prior art keywords
- sustained
- persulfate
- candle
- release
- underground water
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Classifications
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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
-
- 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
Abstract
The persulfate that the invention discloses a kind of for in-situ remediation of underground water is sustained candle, the persulfate be sustained candle be it is cylindric, be made of oxidant, the dispersing agent of 5%-35% and the coagulator of 30%-80% that mass percent is 15%-35%.The present invention is by adjusting proportion and specification between oxidant, dispersing agent and coagulator, it is possible to provide different sustained release rates, sustained release amount and the persulfate sustained release candle for being sustained the service life, to be suitable for the in-situ oxidation reparation of different type organic contamination place underground water.
Description
Technical field
The present invention relates to groundwater remediation technical field, specifically a kind of persulfate for in-situ remediation of underground water is slow
Release candle.
Background technique
In situ chemical oxidation is a kind of soil and groundwater fast repair technique more praised highly both at home and abroad in recent years, often
Chemical oxidizing agent has ozone, hydrogen peroxide, permanganate, Fenton reagent and persulfate.It is repaired in actual place engineering
In multiple application, oxidant is mainly directly injected into groundwater environment in the form of a solution, it is significant to repair initial performances, but due to molten
The oxidant of liquid form enters nondirectional rapid dispersion after groundwater environment, so that the Oxidizer distribution of underground restoring area is not
Foot causes reparation middle and later periods efficiency lower, and repairing effect is poor.For this purpose, developing the slow-release material of oxidant can effectively solve
The above problem.
Compared with other oxidants, persulfate is more stable under normal conditions, easy transport, soluble easily in water, Yi Chuanzhi, has extensively
The properties such as pH application range, the demand for development of in situ chemical oxidation can be well adapted for；The especially standard oxygen of persulfate
Change reduction potential is 2.01V, close to ozone, is greater than potassium permanganate and hydrogen peroxide, is a kind of broad-spectrum high efficacy oxidant.Cause
This, when persulfate is prepared into slow-release material as oxidant, can be improved with significantly more efficient in-situ oxidation degradation of contaminant
Groundwater remediation efficiency.
In situ chemical oxidation technology based on persulfate often repairs preprocessing means as a kind of contaminated site, is used for
Pollutant concentration is repaired relatively high contaminated site early period, to gradually reduce pollutant concentration, meets contaminated site
The technology needs of later period biology in situ reparation, Natural Attenuation reparation.In addition, as persulfate oxidation technology itself, persulfuric acid
There are effective concentration ratio between salt and pollutant, both general molar concentration rate is needed to reach 20-100:1, could effectively be dropped
Solve pollutant.Therefore, the adaptability of technology and Practical Project based on persulfate in-situ oxidation repair angle, it is desirable that persulfate
Slow-release material has relatively high and more wide in range sustained release rate, to adapt to the original position of different pollutant concentration underground water
Oxidation is repaired.
But in terms of the persulfuric acid saline oxidizing agent slow-release material performance of existing announcement, technical indicator is often lower to obtain
For the purpose of persulfate rate of release, lesser persulfate burst size and longer service life, such as: persulfate release
Rate is 0.1-0.6 mg/d/g, and persulfate burst size is 0.5-250mg/d, and service life is 1-10.Therefore, existing mistake
There is also many inadaptabilities using itself for sulfate slow-release material and persulfate oxidation engineering.In addition, too low mistake
Sulfate rate of release certainly will increase the size of permeable reactive barrier in situ and the engineering dosage of persulfate sustained release agent, in turn
Increase recovery technique construction investment.
Core component of the oxidant as underground water in situ chemical oxidation reparation needs in Practical Project reparation application
According to the service life of the pollution level of underground water, reparation target and sustained release agent, periodic replacement sustained release oxidant.Therefore, slow-release oxygen
The replaceability easy to disassemble of agent, recyclable recycling property, become in oxidant slow-release material engineer application it is in need of consideration its
His problem.
Summary of the invention
It is an object of the invention to solve the problems in above-mentioned background technique and deficiency, a kind of sustained release rate range is provided more
It is sustained candle for the higher persulfate of wide in range, sustained-release dosage, to be suitable for different type organic contamination place underground water
In-situ oxidation reparation.
To achieve the above object, a kind of persulfate for in-situ remediation of underground water provided by the invention is sustained candle,
To be cylindric, it is made of oxidant, the dispersing agent of 5%-35% and the coagulator of 30%-80% that mass percent is 15%-35%.
A kind of persulfate for in-situ remediation of underground water is sustained candle, and oxidant is peroxydisulfate, can
Be one of sodium peroxydisulfate, potassium peroxydisulfate, persulfuric acid calcium and ammonium persulfate or it is a variety of mixed according to arbitrary proportion after obtain
Mixture, preferably, the oxidant be purity >=99%, granularity be -140 mesh of 50 mesh sodium peroxydisulfate.
A kind of persulfate for in-situ remediation of underground water is sustained candle, and dispersing agent is that granularity is 20 mesh -100
Purpose flyash.
A kind of persulfate for in-situ remediation of underground water is sustained candle, and coagulator is fusing point at 50 DEG C -64
Fully refined paraffin wax within the scope of DEG C.
A kind of persulfate for in-situ remediation of underground water is sustained candle, and persulfate is sustained the shape of candle
It is 1.5 cm -4cm for diameter, length is the cylinder of 5-15cm.
A kind of persulfate for in-situ remediation of underground water is sustained candle, and persulfate rate of release is 0.3
mg/d/g -12mg/d/g。
A kind of persulfate for in-situ remediation of underground water is sustained candle, and persulfate burst size is 7mg/d
-2866mg/d。
A kind of persulfate for in-situ remediation of underground water is sustained candle, and persulfate is sustained the service life as 28d-
480d。
The method provided by the invention for preparing above-mentioned sodium peroxydisulfate sustained release candle, key step are as follows:
(1) by coagulator: fully refined paraffin wax, mass ratio 30%-80% 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 oxidant: sodium peroxydisulfate, mass ratio 15%-35%, dispersing agent: flyash, mass ratio 5%-35%, sequence add
Enter in the coagulator being completely melt；
(3) by above-mentioned persulfate slow-release material mixture in constant temperature electric magnetic blender, 150r/min revolving speed is stirred
10min is mixed, and 20min is stirred by ultrasonic in thermostatic ultrasonic cleaning machine；
(4) above-mentioned well-mixed persulfate slow-release material mixture is poured into rapidly diameter is 1 cm -4cm, long
Degree is in the cylindrical candle mold of 5-15cm；
(5) it after the cooling and shaping of persulfate slow-release material mixture, is removed from the molds, is placed on 18 DEG C of -25 DEG C of room temperatures
Ventilation, shady and cool 18-36h obtain persulfate sustained release candle sample after it is fully cooled.
After sodium peroxydisulfate sustained release candle provided by the invention reaches the sustained release service life in practical applications, raw material can recycle again
It recycles, specific steps are as follows: by the sustained release candle of failure as in 70 DEG C -75 DEG C of thermostatic container, up to candle is completely melt,
Then quiescent setting 30min, solution are coagulator, and lower layer's isolate is dispersing agent, again coagulator and dispersing agent after the recovery
It can be reused for preparing sodium peroxydisulfate sustained release candle.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention firstly provides use persulfate, flyash and paraffin to prepare persulfate sustained release candle jointly,
In: persulfate is as oxidant, and flyash is as dispersing agent, and paraffin is as coagulator.
(2) present invention can be matched and dispersing agent grain by adjusting between oxidizer dose, dispersing agent and coagulator
Degree, the sustained release channel sized of control sustained release candle, and then control the sustained release rate of sustained release candle, sustained release life span；The present invention
Different sustained release rates can be provided and be sustained the persulfate sustained release candle in service life, thus adapt to different pollution levels and range
Groundwater remediation engineering.
(3) shape and specification size that the present invention can be sustained candle by adjusting persulfate, are prepared into and are conducive to replacement
Oxidant modular assembly, and be used for different reparation scenes.
(4) present invention can be used cooperatively from different transition metal ions, oxidant activator, for in-situ oxidation reparation
The underground water polluted by petroleum hydrocarbon such as benzene homologues, polycyclic aromatic hydrocarbon, methyl tertiary butyl ether(MTBE) have preferable repairing effect and long-time stability.
(5) present invention is conveniently replaceable, and dispersing agent, coagulator can recycle, and be reused for after reaching service life
Prepare slow-release material.
(6) 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 oxidant, dispersing agent, the percent mass ratio of coagulator, specification, over cure is prepared with abovementioned steps
Sour sodium is sustained candle.Oxidant: sodium peroxydisulfate, 100 mesh, mass ratio 15%, 5.3g；Dispersing agent: flyash, -100 mesh of 50 mesh,
Mass ratio 5%, 2.3g；Coagulator: fully refined paraffin wax, 58 DEG C of fusing point, mass ratio 80%, 30.5g；Prepared sodium peroxydisulfate is slow
Release candle specification are as follows: diameter 2cm, length 10cm.The NEN7375 standard organized to set up using EU criteria is slow to sodium peroxydisulfate
It releases candle and carries out leaching test, and sampling and testing sodium peroxydisulfate concentration, analyze its release performance.The result shows that: over cure in 64 days
The average rate of release of sour sodium is 0.3 mg/d/g, and calculating mean release is 11.45mg/d, and the measuring and calculating sustained release service life is 467d.
Embodiment 2
According to following oxidant, dispersing agent, the percent mass ratio of coagulator, specification, over cure is prepared with abovementioned steps
Sour sodium is sustained candle.Oxidant: sodium peroxydisulfate, 100 mesh, mass ratio 15%, 3g；Dispersing agent: flyash, -100 mesh of 50 mesh, matter
Amount ratio 5%, 1.3g；Coagulator: fully refined paraffin wax, 58 DEG C of fusing point, mass ratio 80%, 17.2g；Prepared sodium peroxydisulfate sustained release
Candle specification are as follows: diameter 1.5cm, length 10cm.The NEN7375 standard organized to set up using EU criteria is slow to sodium peroxydisulfate
It releases candle and carries out leaching test, and sampling and testing sodium peroxydisulfate concentration, analyze its release performance.The result shows that: over cure in 64 days
The average rate of release of sour sodium is 0.34 mg/d/g, and calculating mean release is 7.3mg/d, and the measuring and calculating sustained release service life is 411d.
Embodiment 3
According to following oxidant, dispersing agent, the percent mass ratio of coagulator, specification, over cure is prepared with abovementioned steps
Sour sodium is sustained candle.Oxidant: sodium peroxydisulfate, 100 mesh, mass ratio 20%, 8.6g；Dispersing agent: flyash, -100 mesh of 50 mesh,
Mass ratio 10%, 4.3g；Coagulator: fully refined paraffin wax, 60 DEG C of fusing point, mass ratio 70%, 30.2g；Prepared sodium peroxydisulfate
It is sustained candle specification are as follows: diameter 2cm, length 10cm.The NEN7375 standard organized to set up using EU criteria is to sodium peroxydisulfate
It is sustained candle and carries out leaching test, and sampling and testing sodium peroxydisulfate concentration, analyze its release performance.The result shows that: mistake in 64 days
The average rate of release of sodium sulphate be 0.7 mg/d/g, calculatings mean release be 30.22mg/d, measuring and calculating be sustained the service life be
285d。
Embodiment 4
According to following oxidant, dispersing agent, the percent mass ratio of coagulator, specification, over cure is prepared with abovementioned steps
Sour sodium is sustained candle.Oxidant: sodium peroxydisulfate, 100 mesh, mass ratio 25%, 12g；Dispersing agent: flyash, -100 mesh of 50 mesh,
Mass ratio 15%, 7.2g；Coagulator: fully refined paraffin wax, 60 DEG C of fusing point, mass ratio 60%, 28.9g；Prepared sodium peroxydisulfate
It is sustained candle specification are as follows: diameter 2cm, length 10cm.The NEN7375 standard organized to set up using EU criteria is to sodium peroxydisulfate
It is sustained candle and carries out leaching test, and sampling and testing sodium peroxydisulfate concentration, analyze its release performance.The result shows that: mistake in 64 days
The average rate of release of sodium sulphate be 1.6 mg/d/g, calculatings mean release be 77.24mg/d, measuring and calculating be sustained the service life be
156d。
Embodiment 5
According to following oxidant, dispersing agent, the percent mass ratio of coagulator, specification, over cure is prepared with abovementioned steps
Sour sodium is sustained candle.Oxidant: sodium peroxydisulfate, 100 mesh, mass ratio 25%, 12g；Dispersing agent: flyash, -40 mesh of 20 mesh, matter
Amount ratio 15%, 7.2g；Coagulator: fully refined paraffin wax, 60 DEG C of fusing point, mass ratio 60%, 28.9g；Prepared sodium peroxydisulfate is slow
Release candle specification are as follows: diameter 2cm, length 10cm.The NEN7375 standard organized to set up using EU criteria is slow to sodium peroxydisulfate
It releases candle and carries out leaching test, and sampling and testing sodium peroxydisulfate concentration, analyze its release performance.The result shows that: over cure in 64 days
The average rate of release of sour sodium be 2.3 mg/d/g, calculatings mean release be 111.04mg/d, measuring and calculating be sustained the service life be
108d。
Embodiment 6
According to following oxidant, dispersing agent, the percent mass ratio of coagulator, specification, over cure is prepared with abovementioned steps
Sour sodium is sustained candle.Oxidant: sodium peroxydisulfate, 100 mesh, mass ratio 35%, 19.5g；Dispersing agent: flyash, 50 mesh -100
Mesh, mass ratio 20%, 11.1g；Coagulator: fully refined paraffin wax, 60 DEG C of fusing point, mass ratio 45%, 25.1g；Prepared over cure
Sour sodium is sustained candle specification are as follows: diameter 2cm, length 10cm.The NEN7375 standard organized to set up using EU criteria is to over cure
Sour sodium sustained release candle carries out leaching test, and sampling and testing sodium peroxydisulfate concentration, analyzes its release performance.The result shows that: 36 days
The average rate of release of interior sodium peroxydisulfate is 5.8 mg/d/g, and calculating mean release is 323.26mg/d, measuring and calculating sustained release service life
For 60d.
Embodiment 7
According to following oxidant, dispersing agent, the percent mass ratio of coagulator, specification, over cure is prepared with abovementioned steps
Sour sodium is sustained candle.Oxidant: sodium peroxydisulfate, 100 mesh, mass ratio 35%, 22.4g；Dispersing agent: flyash, -60 mesh of 32 mesh,
Mass ratio 35%, 22.4g；Coagulator: fully refined paraffin wax, 64 DEG C of fusing point, mass ratio 30%, 19.2g；Prepared sodium peroxydisulfate
It is sustained candle specification are as follows: diameter 2cm, length 10cm.The NEN7375 standard organized to set up using EU criteria is to sodium peroxydisulfate
It is sustained candle and carries out leaching test, and sampling and testing sodium peroxydisulfate concentration, analyze its release performance.The result shows that: mistake in 16 days
The average rate of release of sodium sulphate be 12.1 mg/d/g, calculatings mean release be 767.73mg/d, measuring and calculating be sustained the service life be
29d。
Embodiment 8
According to following oxidant, dispersing agent, the percent mass ratio of coagulator, specification, over cure is prepared with abovementioned steps
Sour sodium is sustained candle.Oxidant: sodium peroxydisulfate, 100 mesh, mass ratio 35%, 89.6g；Dispersing agent: flyash, -60 mesh of 32 mesh,
Mass ratio 35%, 89.6g；Coagulator: fully refined paraffin wax, 64 DEG C of fusing point, mass ratio 30%, 76.8g；Prepared sodium peroxydisulfate
It is sustained candle specification are as follows: diameter 4cm, length 10cm.The NEN7375 standard organized to set up using EU criteria is to sodium peroxydisulfate
It is sustained candle and carries out leaching test, and sampling and testing sodium peroxydisulfate concentration, analyze its release performance.The result shows that: mistake in 16 days
The average rate of release of sodium sulphate be 11.2 mg/d/g, calculatings mean release be 2866.19mg/d, measuring and calculating be sustained the service life be
31d。
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 (6)
1. a kind of persulfate for in-situ remediation of underground water is sustained candle, it is characterised in that by mass percent be 15%-
The coagulator of 35% oxidant, the dispersing agent of 15%-35% and 30%-60% forms；The oxidant is peroxydisulfate；Institute
The dispersing agent stated is the flyash that granularity is -100 mesh of 20 mesh；The coagulator is that fusing point is complete within the scope of 50 DEG C -64 DEG C
Fully refined paraffin wax；The peroxydisulfate is sodium peroxydisulfate.
2. a kind of persulfate for in-situ remediation of underground water according to claim 1 is sustained candle, which is characterized in that
The peroxydisulfate is purity >=99%, and granularity is the sodium peroxydisulfate of -140 mesh of 50 mesh.
3. a kind of persulfate for in-situ remediation of underground water according to claim 1 is sustained candle, which is characterized in that
It is 1.5 cm -4cm that the persulfate sustained release candle, which is diameter, and length is the cylinder of 5-15cm.
4. a kind of persulfate for in-situ remediation of underground water according to claim 1 is sustained candle, which is characterized in that
The peroxydisulfate rate of release is 0.3 mg/d/g -12mg/d/g.
5. a kind of persulfate for in-situ remediation of underground water according to claim 1 is sustained candle, which is characterized in that
The peroxydisulfate burst size is 7mg/d -2866mg/d.
6. a kind of persulfate for in-situ remediation of underground water according to claim 1 is sustained candle, which is characterized in that
The peroxydisulfate sustained release service life is 28d-480d.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611061740.1A CN106477648B (en) | 2016-11-28 | 2016-11-28 | A kind of persulfate sustained release candle for in-situ remediation of underground water |
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| CN201611061740.1A CN106477648B (en) | 2016-11-28 | 2016-11-28 | A kind of persulfate sustained release candle for in-situ remediation of underground water |
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| CN106477648B true CN106477648B (en) | 2019-11-12 |
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Families Citing this family (2)
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| CN112358012A (en) * | 2020-11-27 | 2021-02-12 | 北京伦至环境科技有限公司 | Preparation method of efficient slow-release filling material for underground water permeable reactive barrier |
| CN112646584A (en) * | 2020-12-31 | 2021-04-13 | 中节能大地（杭州）环境修复有限公司 | Slow-release oxidant for treating organic contaminated soil and preparation method thereof |
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Granted publication date: 20191112 Termination date: 20201128 |