CN113582481A - Method for resource utilization of lake and reservoir sediment - Google Patents
Method for resource utilization of lake and reservoir sediment Download PDFInfo
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- CN113582481A CN113582481A CN202110874586.4A CN202110874586A CN113582481A CN 113582481 A CN113582481 A CN 113582481A CN 202110874586 A CN202110874586 A CN 202110874586A CN 113582481 A CN113582481 A CN 113582481A
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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
- C02F11/004—Sludge detoxification
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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
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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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
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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Abstract
The application relates to the technical field of soil resource recycling, and particularly discloses a method for recycling lake and reservoir bottom mud. The method comprises the following steps: drying and dehydrating the lake and reservoir sediment, crushing and sieving the sediment, adding wood fiber and deionized water, continuously grinding and mixing the mixture, filtering and drying the mixture to obtain treated powder; adding the treated powder into an inert solvent, adding a heavy metal ion capture agent, stirring to uniformly disperse the treated powder in the inert solvent, standing and naturally settling to obtain a lower-layer solid matter; washing the solid with anhydrous ethanol, drying, sieving, mixing with active carbon, parching, and sieving to obtain improved powder; mixing the modified powder with deionized water to obtain modified mud; and adding wheat straws, rice washing water and beneficial bacteria into the improved mud, mixing, and performing anaerobic fermentation to obtain the planting soil. The method has the capability of improving the resource utilization of the lake and reservoir sediment.
Description
Technical Field
The application relates to the technical field of soil resource recycling, in particular to a method for recycling lake and reservoir sediment.
Background
In recent years, with the rapid development of industry, serious pollution occurs to water bodies such as riverways and lakes, pollutants enter the water bodies through ways such as atmospheric sedimentation, wastewater discharge, rainwater leaching and scouring, and a large amount of refractory pollutants are accumulated and gradually enriched in sediment of the water bodies.
The dredging is an effective measure for solving endogenous pollution of a water body and dredging a channel, but a large amount of bottom mud generated by dredging can generate huge damage to an ecological system if the bottom mud is not properly treated. The desilting bottom mud is generally used as solid waste to be stacked in a mud storage field, so that not only is a large amount of field occupied, but also secondary environmental pollution is easy to generate. Therefore, the resource utilization of the dredging sediment becomes a bottleneck for restricting dredging engineering and repairing black and odorous water.
Disclosure of Invention
In order to improve the capacity of resource utilization of the lake and reservoir sediment, the application provides a method for resource utilization of the lake and reservoir sediment.
The application provides a method for resource utilization of lake and reservoir sediment, which adopts the following technical scheme:
a method for resource utilization of lake and reservoir sediment comprises the following steps:
s1, drying and dehydrating the lake and reservoir sediment, and crushing the sediment through a 100-mesh screen to obtain sediment powder; adding wood fiber and deionized water into the bottom mud powder, placing the mixture in a nitrogen environment with the temperature of 150-160 ℃ and the atmospheric pressure of 3-3.5, continuously grinding and mixing the bottom mud powder and the wood fiber for 1-1.5h, filtering and drying to obtain treated powder;
s2, adding the treated powder into an inert solvent, adding a heavy metal ion capturing agent, stirring to uniformly disperse the treated powder in the inert solvent, placing the mixture in an environment at 80-90 ℃ for reaction for 1-1.2h, standing and naturally settling to obtain a lower solid substance; wherein the weight part ratio of the treatment powder to the heavy metal ion trapping agent is 1: (0.02-0.024);
s3, washing the solid with absolute ethyl alcohol, drying, sieving with a 100-mesh sieve, mixing with activated carbon powder of 50-70 meshes, stir-frying at 130-150 ℃ for 1-1.5h under 1 standard atmospheric pressure, and sieving with a 100-mesh sieve to obtain improved powder;
s4, mixing the improved powder with deionized water to obtain improved mud; adding wheat straw, rice washing water and beneficial bacteria into the improved mud, mixing, and fermenting at 35-40 deg.C in oxygen-free environment for 15-20 days to obtain planting soil; wherein the weight part ratio of the improved mud to the wheat straw is 1: (0.2-0.3), the volume ratio of the improved mud to the rice washing water is 1: (0.2-0.25).
By adopting the technical scheme, in S1, the lake sediment is dried, ground and sieved, large-particle substances in the lake sediment are removed, wood fibers and deionized water are added and ground in a high-temperature oxygen-free environment, the wood fibers are carbonized in a high-temperature environment to obtain biochar, and the biochar and the high-temperature environment cooperate to disinfect and sterilize the lake sediment; in S2, adding the processing powder into an inert solvent, wherein the processing powder does not react, and after adding a heavy metal ion capture agent, the processing powder and the heavy metal ion capture agent are uniformly dispersed in the inert solvent, so that the heavy metal ion capture agent can react with heavy metal ions to obtain a heavy metal ion complex precipitate, standing and settling, adding activated carbon powder into S3, frying in a high-temperature environment, wherein the porosity of the activated carbon powder can adsorb the complex precipitate obtained in S2, and further sieving the activated carbon powder to separate heavy metal ions; in S4, the improved powder and deionized water are mixed to obtain improved mud, wheat straws, rice washing water and beneficial bacteria are added into the improved mud, the improved mud is placed in an anaerobic environment for fermentation, the beneficial bacteria decompose the wheat straws and the rice washing water, so that the fertility of the improved mud is improved, the wheat straws have a high-fiber structure, the rice washing water contains starch, and the starch can bond the improved mud, so that the forming of planting soil is facilitated, and the grittiness of the planting soil is reduced.
Preferably, in S1, the wood fiber is pine wood chips.
Preferably, in S1, the mixing ratio of the bottom mud powder and the wood fiber is 1: (0.4-0.5).
Preferably, in S2, the heavy metal ion capture agent and the polyethylene glycol are added simultaneously, and the weight ratio of the processing powder, the heavy metal ion capture agent and the polyethylene glycol is 1: (0.02-0.024): (0.01-0.02).
By adopting the technical scheme, the polyethylene glycol can improve the surface activity of the treated powder, so that the contact between the heavy metal ion trapping agent and the treated powder is promoted, the reaction of the heavy metal ion trapping agent and the metal ions is promoted, and the capability of precipitating the metal ions is improved.
Preferably, the heavy metal ion trapping agent is a composition of TMT-15 and TMT-18D, and the weight fraction mixing ratio of the TMT-15 to the TMT-18D is 1: 1.
preferably, in S2, the inert solvent is methanol.
Preferably, in S4, the fermentation environment is an oxygen-free light-shielding environment.
Preferably, in S4, the beneficial bacteria is a combination of yeast and bacillus.
In summary, the present application has the following beneficial effects:
1. in will handling the powder earlier in this application and add the inert solvent, add the heavy metal ion trapping agent again, and then stir the dispersion back, handle powder homodisperse in the inert solvent, can fully contact with the heavy metal ion trapping agent, improved the throughput of heavy metal ion trapping agent to heavy metal ion.
2. In the application, the solid matter and the activated carbon powder are mixed and fried, the activity of the activated carbon is improved at high temperature, the activated carbon powder is fully contacted with the solid matter, the metal ions are precipitated and adsorbed on the activated carbon powder, and then the metal ions are removed after being screened and filtered.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
Examples
Example 1
The method for resource utilization of lake and reservoir sediment in embodiment 1 includes the following steps:
s1, drying and dehydrating the lake and reservoir sediment, and crushing the sediment through a 100-mesh screen to obtain sediment powder; adding pine sawdust and deionized water into the bottom mud powder, placing in a nitrogen environment with the temperature of 150 ℃ and the pressure of 3.5 atmospheres, continuously grinding and mixing the bottom mud powder and the wood fiber for 1.5h, filtering and drying to obtain treated powder; wherein the mixing ratio of the bottom mud powder to the pine wood chips in parts by weight is 1: 0.4;
s2, adding the treated powder into methanol, adding a heavy metal ion trapping agent, stirring to uniformly disperse the treated powder in the methanol, placing the mixture in an environment at 90 ℃ for reaction for 1.2h, standing and naturally settling to obtain a lower solid substance; wherein the weight part ratio of the processing powder to the heavy metal ion trapping agent is 1: 0.02, and the heavy metal ion trapping agent is 1: 1 a composition;
s3, washing the solid with absolute ethyl alcohol, drying, screening with a 100-mesh screen, mixing with activated carbon powder of 50-70 meshes, frying at 130 ℃ for 1.5h under 1 standard atmospheric pressure, and screening with a 100-mesh screen to obtain improved powder;
s4, mixing the improved powder with deionized water to obtain improved mud; adding wheat straw, rice washing water and beneficial bacteria into the improved mud, mixing, and fermenting in 35 deg.C oxygen-free light-shielding environment for 20d to obtain planting soil; wherein the weight part ratio of the improved mud to the wheat straw is 1: 0.2, the volume ratio of the improved mud to the rice washing water is 1: 0.2; the beneficial bacteria are composition of yeast and spore bacteria.
Example 2
The method for resource utilization of lake and reservoir sediment in embodiment 2 includes the following steps:
s1, drying and dehydrating the lake and reservoir sediment, and crushing the sediment through a 100-mesh screen to obtain sediment powder; adding pine sawdust and deionized water into the bottom mud powder, placing in a nitrogen environment with the temperature of 160 ℃ and the pressure of 3 atmospheres, continuously grinding and mixing the bottom mud powder and the wood fiber for 1h, filtering and drying to obtain treated powder; wherein the mixing ratio of the bottom mud powder to the pine wood chips in parts by weight is 1: 0.5;
s2, adding the treated powder into methanol, adding a heavy metal ion trapping agent, stirring to uniformly disperse the treated powder in the methanol, placing the mixture in an environment at 80 ℃ for reaction for 1 hour, standing and naturally settling to obtain a lower-layer solid matter; wherein the weight part ratio of the processing powder to the heavy metal ion trapping agent is 1: 0.024, and the heavy metal ion trapping agent is 1: 1 a composition;
s3, washing the solid with absolute ethyl alcohol, drying, sieving with a 100-mesh sieve, mixing with activated carbon powder of 50-70 meshes, frying at 150 ℃ for 1 hour under the environment of 1 standard atmospheric pressure, and sieving with a 100-mesh sieve to obtain improved powder;
s4, mixing the improved powder with deionized water to obtain improved mud; adding wheat straw, rice washing water and beneficial bacteria into the improved mud, mixing, and fermenting in an oxygen-free light-shielding environment at 40 deg.C for 15 days to obtain planting soil; wherein the weight part ratio of the improved mud to the wheat straw is 1: 0.3, the volume ratio of the improved mud to the rice washing water is 1: 0.25; the beneficial bacteria are composition of yeast and spore bacteria.
Example 3
The method for resource utilization of lake and reservoir sediment in embodiment 3 includes the following steps:
s1, drying and dehydrating the lake and reservoir sediment, and crushing the sediment through a 100-mesh screen to obtain sediment powder; adding pine sawdust and deionized water into the bottom mud powder, placing in a nitrogen environment with the temperature of 160 ℃ and the pressure of 3 atmospheres, continuously grinding and mixing the bottom mud powder and the wood fiber for 1h, filtering and drying to obtain treated powder; wherein the mixing ratio of the bottom mud powder to the pine wood chips in parts by weight is 1: 0.5;
s2, adding the treated powder into methanol, adding a heavy metal ion trapping agent and polyethylene glycol 6000, stirring to uniformly disperse the treated powder in the methanol, placing the mixture in an environment at 80 ℃ for reaction for 1 hour, standing and naturally settling to obtain a lower-layer solid matter; wherein the weight part ratio of the treatment powder to the heavy metal ion trapping agent to the polyethylene glycol 6000 is 1: 0.02: 0.01, and the heavy metal ion trapping agent is 1: 1 a composition;
s3, washing the solid with absolute ethyl alcohol, drying, sieving with a 100-mesh sieve, mixing with activated carbon powder of 50-70 meshes, frying at 150 ℃ for 1 hour under the environment of 1 standard atmospheric pressure, and sieving with a 100-mesh sieve to obtain improved powder;
s4, mixing the improved powder with deionized water to obtain improved mud; adding wheat straw, rice washing water and beneficial bacteria into the improved mud, mixing, and fermenting in an oxygen-free light-shielding environment at 40 deg.C for 15 days to obtain planting soil; wherein the weight part ratio of the improved mud to the wheat straw is 1: 0.3, the volume ratio of the improved mud to the rice washing water is 1: 0.25; the beneficial bacteria are composition of yeast and spore bacteria.
Example 4
The method for resource utilization of lake and reservoir sediment in embodiment 4 includes the following steps:
s1, drying and dehydrating the lake and reservoir sediment, and crushing the sediment through a 100-mesh screen to obtain sediment powder; adding pine sawdust and deionized water into the bottom mud powder, placing in a nitrogen environment with the temperature of 160 ℃ and the pressure of 3 atmospheres, continuously grinding and mixing the bottom mud powder and the wood fiber for 1h, filtering and drying to obtain treated powder; wherein the mixing ratio of the bottom mud powder to the pine wood chips in parts by weight is 1: 0.5;
s2, adding the treated powder into methanol, adding a heavy metal ion trapping agent and polyethylene glycol 6000, stirring to uniformly disperse the treated powder in the methanol, placing the mixture in an environment at 80 ℃ for reaction for 1 hour, standing and naturally settling to obtain a lower-layer solid matter; wherein the weight part ratio of the treatment powder to the heavy metal ion trapping agent to the polyethylene glycol 6000 is 1: 0.024: 0.02, and the heavy metal ion trapping agent is 1: 1 a composition;
s3, washing the solid with absolute ethyl alcohol, drying, sieving with a 100-mesh sieve, mixing with activated carbon powder of 50-70 meshes, frying at 150 ℃ for 1 hour under the environment of 1 standard atmospheric pressure, and sieving with a 100-mesh sieve to obtain improved powder;
s4, mixing the improved powder with deionized water to obtain improved mud; adding wheat straw, rice washing water and beneficial bacteria into the improved mud, mixing, and fermenting in an oxygen-free light-shielding environment at 40 deg.C for 15 days to obtain planting soil; wherein the weight part ratio of the improved mud to the wheat straw is 1: 0.3, the volume ratio of the improved mud to the rice washing water is 1: 0.25; the beneficial bacteria are composition of yeast and spore bacteria.
Comparative example
Comparative example 1
The difference between the comparative example 1 and the example 1 is that in the method for resource utilization of lake sediment in the comparative example 1, step S2 is that the treated powder and the heavy metal ion scavenger are mixed, then the mixture is placed in an environment with the temperature of 90 ℃ for reaction for 1.2h, and then the mixture is placed still for natural sedimentation to obtain lower solid matter; wherein the weight part ratio of the processing powder to the heavy metal ion trapping agent is 1: 0.02, and the heavy metal ion trapping agent is 1: 1, and (b) a composition.
Performance test
Detection method
The same fished lake and reservoir sediment is stirred and mixed, and then is evenly divided into five parts, the resource utilization methods in the examples 1-4 and the comparative example 1 are respectively carried out, the contents of four metal ions, namely Cu, Cr, Hg and As, in the mixed lake and reservoir sediment are detected by using a TPJS-B type soil heavy metal detector, and the detection results are shown in Table 1.
The contents of four metal ions, namely Cu, Cr, Hg and As, in the planting soils prepared in examples 1-4 and comparative example 1 were measured by using a soil heavy metal detector model TPJS-B, and the measurement results are shown in Table 1.
The planting soils prepared in examples 1-4 and comparative example 1 were pressed into 10 cubes of 1 dm for planting ryegrass, 500 full ryegrass seeds were selected and soaked in 30 ℃ warm water for 5 hours, 10 ryegrass seeds were evenly planted on each planting soil, the planting temperature was controlled at 15-25 ℃, the germination rate after 5 days and the growth height after 15 days were checked, and the test results are shown in table 2.
Table 1 heavy metal ion detection in examples 1 to 4 and comparative example 1
TABLE 2 results of planting ryegrass on planting soil prepared in examples 1 to 4 and comparative example 1
| Germination after 5 d/%) | Average growth height/cm after 15 days | |
| Example 1 | 98 | 6.43 |
| Example 2 | 97 | 6.48 |
| Example 3 | 99 | 6.44 |
| Example 4 | 98 | 6.47 |
| Comparative example 1 | 67 | 3.15 |
Referring to examples 1 to 4 and comparative example 1 in combination with Table 1, it can be seen that the method of the present application can reduce the content of heavy metal ions in the lake sediment.
Referring to examples 1 to 4 and comparative example 1 in combination with Table 2, it can be seen that the soil for plantation prepared by examples 1 to 4 has relatively low heavy metal content, which is beneficial to germination and growth of ryegrass.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A method for resource utilization of lake and reservoir sediment is characterized by comprising the following steps:
s1, drying and dehydrating the lake and reservoir sediment, and crushing the sediment through a 100-mesh screen to obtain sediment powder; adding wood fiber and deionized water into the bottom mud powder, placing the mixture in a nitrogen environment with the temperature of 150-160 ℃ and the atmospheric pressure of 3-3.5, continuously grinding and mixing the bottom mud powder and the wood fiber for 1-1.5h, filtering and drying to obtain treated powder;
s2, adding the treated powder into an inert solvent, adding a heavy metal ion capturing agent, stirring to uniformly disperse the treated powder in the inert solvent, placing the mixture in an environment at 80-90 ℃ for reaction for 1-1.2h, standing and naturally settling to obtain a lower solid substance; wherein the weight part ratio of the treatment powder to the heavy metal ion trapping agent is 1: (0.02-0.024);
s3, washing the solid with absolute ethyl alcohol, drying, sieving with a 100-mesh sieve, mixing with activated carbon powder of 50-70 meshes, stir-frying at 130-150 ℃ for 1-1.5h under 1 standard atmospheric pressure, and sieving with a 100-mesh sieve to obtain improved powder;
s4, mixing the improved powder with deionized water to obtain improved mud; adding wheat straw, rice washing water and beneficial bacteria into the improved mud, mixing, and fermenting at 35-40 deg.C in oxygen-free environment for 15-20 days to obtain planting soil; wherein the weight part ratio of the improved mud to the wheat straw is 1: (0.2-0.3), the volume ratio of the improved mud to the rice washing water is 1: (0.2-0.25).
2. The method for resource utilization of lake and reservoir sediment according to claim 1, which is characterized in that: in the S1, the wood fiber is pine wood chips.
3. The method for resource utilization of lake and reservoir sediment as claimed in claim 2, wherein: in the S1, the mixing ratio of the bottom mud powder to the wood fiber in percentage by weight is 1: (0.4-0.5).
4. The method for resource utilization of lake and reservoir sediment according to claim 1, which is characterized in that: and in the step S2, a heavy metal ion trapping agent and polyethylene glycol are added simultaneously, and the weight part ratio of the processing powder to the heavy metal ion trapping agent to the polyethylene glycol is 1: (0.02-0.024): (0.01-0.02).
5. The method for resource utilization of lake and reservoir sediment as claimed in claim 4, wherein: the heavy metal ion trapping agent is a composition of TMT-15 and TMT-18D, and the weight fraction mixing ratio of the TMT-15 to the TMT-18D is 1: 1.
6. the method for resource utilization of lake and reservoir sediment according to claim 1, which is characterized in that: in the S2, the inert solvent is methanol.
7. The method for resource utilization of lake and reservoir sediment according to claim 1, which is characterized in that: in the step S4, the fermentation environment is an oxygen-free light-shielding environment.
8. The method for resource utilization of lake and reservoir sediment according to claim 1, which is characterized in that: in the S4, the beneficial bacteria are a combination of yeast and spore bacteria.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109111065A (en) * | 2018-08-07 | 2019-01-01 | 上海久树环境科技有限公司 | A kind of riverbed ecology synthesis restorative procedure |
| CN109197524A (en) * | 2018-09-26 | 2019-01-15 | 葛洲坝中固科技股份有限公司 | A kind of gardens cultivated soil and the preparation method and application thereof of high alkalinity river and lake silt preparation |
| US20210032538A1 (en) * | 2019-08-01 | 2021-02-04 | Institute Of Geochemistry, Chinese Academy Of Sciences | Method for improving tobacco-planting soil by using biochar |
| CN113142014A (en) * | 2020-12-31 | 2021-07-23 | 中建三局绿色产业投资有限公司 | Alkaline river silt-based garden green planting soil and preparation method thereof |
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- 2021-07-30 CN CN202110874586.4A patent/CN113582481B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109111065A (en) * | 2018-08-07 | 2019-01-01 | 上海久树环境科技有限公司 | A kind of riverbed ecology synthesis restorative procedure |
| CN109197524A (en) * | 2018-09-26 | 2019-01-15 | 葛洲坝中固科技股份有限公司 | A kind of gardens cultivated soil and the preparation method and application thereof of high alkalinity river and lake silt preparation |
| US20210032538A1 (en) * | 2019-08-01 | 2021-02-04 | Institute Of Geochemistry, Chinese Academy Of Sciences | Method for improving tobacco-planting soil by using biochar |
| CN113142014A (en) * | 2020-12-31 | 2021-07-23 | 中建三局绿色产业投资有限公司 | Alkaline river silt-based garden green planting soil and preparation method thereof |
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