CN112916602A - Method for treating arsenic pollution by using waste calcium bloom - Google Patents
Method for treating arsenic pollution by using waste calcium bloom Download PDFInfo
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- CN112916602A CN112916602A CN202110076852.9A CN202110076852A CN112916602A CN 112916602 A CN112916602 A CN 112916602A CN 202110076852 A CN202110076852 A CN 202110076852A CN 112916602 A CN112916602 A CN 112916602A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
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- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Inorganic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for treating arsenic pollution by using waste calcium bloom, which comprises the following steps: s1, collecting the degraded waste calcium bloom of the calcium bloom body and picking out the branches, fallen leaves and weeds covered on the calcium bloom body; s2, crushing the waste calcium bloom collected in the step S1 into calcium bloom particles with the particle size of less than or equal to 2 mm; and S3, mixing the calcium bloom particles obtained in the S2 with the arsenic pollutants, and standing for 3-7 days at the temperature of 20-25 ℃. The method takes the waste calcium bloom as a raw material, and realizes the treatment of arsenic pollution through the action of micro-area environment by screening, crushing, adding in proper proportion, stirring and uniformly mixing with arsenic pollutants.
Description
Technical Field
The invention belongs to the technical field of heavy metal pollution remediation and treatment, and particularly relates to a method for treating arsenic pollution by using waste calcium bloom.
Background
The calcium bloom is also called as lima, is large-pore secondary calcium carbonate formed by deposition of karst spring, river and lake water on the ground surface, generally has a porous sponge structure and a thin-layer shell-shaped and block-shaped structure. The cause of the formation is due to the underground water or surface water in karst areasUnder suitable circumstances, and often under the influence of plant action, leads to oversaturation and precipitation of calcium carbonate. After the hot water in some areas is exposed to the ground surface in the form of hot springs, due to the change of environmental conditions such as pressure and temperature, the precipitates of certain chemical substances dissolved in the hot water often form the fountains near the spring openings, wherein the precipitates are CaCO3The formation of calcium bloom as a precipitate is most common.
For the calcium bloom, the chemical deposition of the calcium bloom source water forms landscapes such as a calcium bloom pool, a calcium bloom beach and the like, and the water body is filled in the landscapes, so that the calcium bloom color pool is formed. Once dehydrated, the water is blackened and then desertified, and the surface is covered by weeds, moss and trees and gradually disappears. The calcium bloom water flow flowing rapidly separates out crystals at the positions with circumfluence and circumfluence to form various landscapes such as a calcium bloom side rock dam, a beach flow, a waterfall and the like. The area covered by the water flow shrinks, and the calcium bloom body loses the nourishment of the water body and becomes black.
At present, research on the degenerated calcium bloom is concentrated on how to recover the degenerated calcium bloom, but a part of the degenerated calcium bloom is difficult to recover, the degenerated calcium bloom is gradually desertified or covered by vegetation to disappear under natural conditions, and related research on how to utilize the degenerated calcium bloom is few.
Disclosure of Invention
The invention aims to: aiming at the defect of low utilization of the waste degraded calcium bloom in the prior art, the method for treating arsenic pollution by using the waste calcium bloom is provided.
The technical scheme adopted by the invention is as follows:
a method for treating arsenic pollution by using waste calcium bloom comprises the following steps:
s1, collecting the degraded waste calcium bloom of the calcium bloom body and picking out the branches, fallen leaves and weeds covered on the calcium bloom body;
s2, crushing the waste calcium bloom collected in the step S1 into calcium bloom particles with the particle size of less than or equal to 2 mm;
and S3, mixing the calcium bloom particles obtained in the S2 with the arsenic pollutants, and standing for 3-7 days at the temperature of 20-25 ℃.
According to the invention, on one hand, the pollutant arsenic is retained by utilizing the natural porous characteristic of the calcium bloom, on the other hand, the surrounding arsenic can be adsorbed by the siphon effect due to the micro-area environment with high-concentration calcium ions in the calcium bloom particles, so that stable mineral calcium arsenate is formed, and the retention rate of the arsenic is further enhanced.
Further, the arsenic contaminant is arsenic-contaminated water or arsenic-contaminated soil.
Further, when the arsenic pollutant is arsenic polluted water, adding the calcium bloom particles into the arsenic polluted water according to the ratio of the calcium bloom particles to the arsenic polluted water of 8-20g:1L, stirring for 3-5h, and then standing.
Further, when the arsenic pollutant is arsenic polluted water, adding the calcium bloom particles into the arsenic polluted water according to the ratio of the calcium bloom particles to the arsenic polluted water of 10g to 1L, stirring for 4 hours, and then standing
Further, when the arsenic pollutant is arsenic-polluted soil, uniformly mixing the calcium bloom particles and the arsenic-polluted soil according to the mass ratio of the calcium bloom particles to the arsenic-polluted soil of 1-2: 10; the preferred mass ratio is 1: 10.
Further, after the calcium bloom particles and the arsenic-polluted soil are uniformly mixed, standing for 5-20h, then adding magnesium phosphate cement, uniformly mixing, and continuing to stand.
Further, the mass ratio of the arsenic-polluted soil to the magnesium phosphate cement is 10-15: 1-2; preferably 12: 1.5.
In the arsenic-polluted soil, compared with arsenic-polluted water, the contact between calcium bloom particles and arsenic is less, so that the siphon effect capacity exerted by the micro-area environment of the calcium bloom particles is limited, after arsenic is primarily cured, magnesium phosphate cement is added to further cure the arsenic-polluted soil, the arsenic in the polluted soil can be wrapped due to the compact net-shaped structure formed by hydration of the magnesium phosphate cement, the strength of the primarily cured body can be enhanced, the external environment erosion resistance of the arsenic-polluted soil is further improved, and the treated soil can be utilized.
Furthermore, the branches, fallen leaves and weeds picked out in the step S1 are crushed to be less than or equal to 1cm, and the crushed branches, fallen leaves and weeds are mixed into the soil after arsenic pollution treatment, so that the waste resources are reused, and a certain effect of soil fertility is achieved.
Furthermore, the volume ratio of the branches, fallen leaves and weeds to the soil is 1-2: 5-8; preferably 1.5: 6.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention utilizes the natural porous characteristic of the calcium bloom, and can retain arsenic; meanwhile, the siphon effect of the micro-area environment of the calcium bloom particles is utilized to adsorb arsenic, and high-concentration calcium ions in the arsenic-removing powder can promote the generation of mineral calcium arsenate and enhance the retention rate of the arsenic;
2. the treatment method disclosed by the invention can be used for removing most of arsenic in a relatively short time, the removal effect is good, the efficiency is high, and the arsenic content in the treated water body and soil leachate is extremely low;
2. the waste calcium bloom is used as a raw material, the raw material is easy to obtain, the characteristics of resource reutilization and waste material recycling are achieved, and the concept of energy conservation, emission reduction and green development is met;
3. the method is a novel way for treating arsenic pollution by wastes, which has no pollution, low cost and simple and easy operation, and has wide market application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the action of the calsium particles of the present invention;
FIG. 2 shows the removal rate of arsenic by the calsium particles.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The preferred embodiment of the invention provides a method for treating arsenic polluted water by using waste calcium bloom, which comprises the following specific steps:
s1, collecting the degraded waste calcium bloom of the calcium bloom body and picking out the branches, fallen leaves and weeds covered on the calcium bloom body;
s2, crushing the waste calcium bloom collected in the step S1 into calcium bloom particles with the particle size of less than or equal to 2 mm;
s3, according to the ratio of the calcified particles to the arsenic polluted water body of 10g: and 1L, mixing the calcium bloom particles obtained in the step S2 with the water body polluted by arsenic, stirring for 4 hours, and standing for 5 days at 25 ℃.
Example 2
The preferred embodiment of the invention provides a method for treating arsenic polluted water by using waste calcium bloom, which comprises the following specific steps:
s1, collecting the degraded waste calcium bloom of the calcium bloom body and picking out the branches, fallen leaves and weeds covered on the calcium bloom body;
s2, crushing the waste calcium bloom collected in the step S1 into calcium bloom particles with the particle size of less than or equal to 2 mm;
s3, according to the ratio of the calcified particles to the arsenic polluted water body of 15 g: and 1L, mixing the calcium bloom particles obtained in the step S2 with the water body polluted by arsenic, stirring for 5 hours, and standing for 6 days at 25 ℃.
Example 3
The preferred embodiment of the invention provides a method for treating arsenic-polluted soil by using waste calcium bloom, which comprises the following specific steps:
s1, collecting the degraded waste calcium bloom of the calcium bloom body and picking out the branches, fallen leaves and weeds covered on the calcium bloom body;
s2, crushing the waste calcium bloom collected in the step S1 into calcium bloom particles with the particle size of less than or equal to 2 mm;
s3, uniformly mixing the calcium bloom particles obtained in the step S2 and the arsenic-polluted soil according to the mass ratio of the calcified particles to the arsenic-polluted soil being 1:10, and standing for 6 days at 25 ℃.
Example 4
The preferred embodiment of the invention provides a method for treating arsenic-polluted soil by using waste calcium bloom, which comprises the following specific steps:
s1, collecting the degraded waste calcium bloom of the calcium bloom body and picking out the branches, fallen leaves and weeds covered on the calcium bloom body;
s2, crushing the waste calcium bloom collected in the step S1 into calcium bloom particles with the particle size of less than or equal to 2 mm;
s3, uniformly mixing the calcium bloom particles obtained in the step S2 with the arsenic-polluted soil according to the mass ratio of the calcified particles to the arsenic-polluted soil of 2:10, standing for 10 hours, adding magnesium phosphate cement, and continuously standing at 25 ℃ for 7 days to obtain the calcium-polluted soil; wherein the mass ratio of the arsenic-polluted soil to the magnesium phosphate cement is 12: 1.5.
Example 5
The preferred embodiment of the invention provides a method for treating arsenic-polluted soil by using waste calcium bloom, which comprises the following specific steps:
s1, collecting the degraded waste calcium bloom of the calcium bloom body and picking out the branches, fallen leaves and weeds covered on the calcium bloom body;
s2, crushing the waste calcium bloom collected in the step S1 into calcium bloom particles with the particle size of less than or equal to 2 mm;
s3, uniformly mixing the calcium bloom particles obtained in the step S2 with the arsenic-polluted soil according to the mass ratio of the calcified particles to the arsenic-polluted soil of 1.5:10, standing for 10 hours, adding magnesium phosphate cement, and continuously standing at 25 ℃ for 7 days to obtain the calcium bloom-polluted soil; wherein the mass ratio of the arsenic-polluted soil to the magnesium phosphate cement is 12: 1.5;
s4, crushing the branches, the fallen leaves and the weeds to be less than or equal to 1cm, and mixing the crushed branches, the fallen leaves and the weeds with the soil after arsenic pollution treatment, wherein the volume ratio of the branches, the fallen leaves and the weeds to the soil is 1.5: 6.
Comparative example
A method for treating arsenic-contaminated soil comprises the following steps:
s1: mixing the polluted soil and NaOH solution to form a semi-solid system, and adding hydrogen peroxide into low-valent arsenic in the soil under the semi-solid system for oxidation treatment; the mass ratio of the added amount of the hydrogen peroxide to the arsenic content in the soil is 1: 3; the adding amount of the NaOH solution and the liquid-solid ratio of the polluted soil are 1: 3;
s2: adding polymeric ferric sulfate into the oxidized polluted soil, mixing and stirring for reaction; the ratio of the iron content in the added polyferric sulfate powder to the arsenic content in the polluted soil is 1: 6.
Experimental example 1
5 parts of arsenic-contaminated water were taken and designated as water bodies 1 to 5, respectively, and treated according to the method of example 1, and 15 parts of arsenic-contaminated soil were taken and designated as soil 1 to 15, respectively, and treated according to the methods of example 3 (soil 1 to 5), example 4 (soil 1 to 10), and comparative example (soil 11 to 15), respectively.
Leaching toxicity tests (direct sampling of water) were performed with reference to HJ/T299-2007.
The results are shown in table 1 below;
TABLE 1 arsenic content
| Type of contamination | Initial concentration of arsenic | Proportion of addition | Final concentration of arsenic |
| Water body 1 | 40mg/L | 10g/L | 0.35mg/L |
| Water body 2 | 50mg/L | 10g/L | 0.44mg/L |
| Water body 3 | 80mg/L | 15g/L | 0.65mg/L |
| Body of water 4 | 100mg/L | 20g/L | 0.70mg/L |
| Water body 5 | 200mg/L | 20g/L | 0.1mg/L |
| Soil 1 | 10mg/g | 1g/10g | 0.45mg/g |
| Soil 2 | 25mg/g | 1g/10g | 0.62mg/g |
| Soil 3 | 50mg/g | 1g/10g | 0.81mg/g |
| Soil 4 | 75mg/g | 1.5g/10g | 0.89mg/g |
| Soil 5 | 100mg/g | 2g/10g | 0.98mg/g |
| Soil 6 | 10mg/g | 1g/10g | 0.32mg/g |
| Soil 7 | 25mg/g | 1g/10g | 0.39mg/g |
| Soil 8 | 50mg/g | 1g/10g | 0.47mg/g |
| Soil 9 | 75mg/g | 1.5g/10g | 0.52mg/g |
| Soil 10 | 100mg/g | 2g/10g | 0.55mg/g |
| Soil 11 | 10mg/g | - | 0.35mg/g |
| Soil 12 | 25mg/g | - | 0.37mg/g |
| Soil 13 | 50mg/g | - | 0.41mg/g |
| Soil 14 | 75mg/g | - | 0.45mg/g |
| Soil 15 | 100mg/g | - | 0.57mg/g |
As can be seen from the above table, the arsenic content in the water body and the soil leachate treated by the method is lower than 1mg/L, and the treatment result of the treatment method of the invention is equivalent to that of a chemical arsenic passivator, is lower than the specification of GB18598-2001, and meets the requirement.
Experimental example 2
Under the conditions that the initial concentration of arsenic in the arsenic-polluted soil is 40mg/L and the adding amount of calcified particles is 4g/L, respectively detecting the soil soaking solution after adding, 2 hours after adding, 4 hours after adding, 8 hours after adding and 24 hours after adding, and measuring the removal rate of the calcified particles to the arsenic, the result is shown in figure 2, and the graph shows that the removal rate of the arsenic in the soil is increased within 12 hours along with the increase of time, and is slowly increased to about 85% after 12 hours, which shows that the treatment method disclosed by the invention realizes the removal of most of the arsenic within a relatively fast time, and has good removal effect and high efficiency.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for treating arsenic pollution by using waste calcium bloom is characterized by comprising the following steps:
s1, collecting the degraded waste calcium bloom of the calcium bloom body and picking out the branches, fallen leaves and weeds covered on the calcium bloom body;
s2, crushing the waste calcium bloom collected in the step S1 into calcium bloom particles with the particle size of less than or equal to 2 mm;
and S3, mixing the calcium bloom particles obtained in the S2 with the arsenic pollutants, and standing for 3-7 days at the temperature of 20-25 ℃.
2. The method for treating arsenic pollution using waste calsiums as claimed in claim 1, wherein the arsenic pollutants are arsenic-polluted water bodies or arsenic-polluted soil.
3. The method for treating arsenic pollution by using waste calcium bloom as claimed in claim 2, wherein when the arsenic pollutant is an arsenic-polluted water body, the calcium bloom particles are added into the arsenic-polluted water body according to the ratio of the calcium bloom particles to the arsenic-polluted water body of 8-20g:1L, stirred for 3-5h and then kept stand.
4. The method for treating arsenic pollution by using waste caltrop as claimed in claim 2, wherein when the arsenic pollutant is arsenic-polluted soil, the caltrop particles and the arsenic-polluted soil are uniformly mixed according to the mass ratio of the caltrop particles to the arsenic-polluted soil being 1-2: 10.
5. The method for treating arsenic pollution by using waste caltrops as claimed in claim 4, wherein the caltrop particles are uniformly mixed with the arsenic-polluted soil, then are kept stand for 5-20h, then are added with magnesium phosphate cement, and are kept stand after being uniformly mixed.
6. The method for treating arsenic pollution by using waste calhua according to claim 5, wherein the mass ratio of the arsenic-polluted soil to the magnesium phosphate cement is 10-15: 1-2.
7. The method for treating arsenic contamination using waste algal tufa according to claim 4 or 5, wherein the branches, fallen leaves and weeds picked up in step S1 are crushed to 1cm or less and mixed into the soil after arsenic contamination treatment.
8. The method for treating arsenic pollution using waste caltrops as claimed in claim 7, wherein the volume ratio of the branches, fallen leaves and weeds to the soil is 1-2: 5-8.
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