CN112429925A - Digestion and solidification treatment method for organic pollutant-heavy metal polluted bottom mud - Google Patents
Digestion and solidification treatment method for organic pollutant-heavy metal polluted bottom mud Download PDFInfo
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- CN112429925A CN112429925A CN202011262201.0A CN202011262201A CN112429925A CN 112429925 A CN112429925 A CN 112429925A CN 202011262201 A CN202011262201 A CN 202011262201A CN 112429925 A CN112429925 A CN 112429925A
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- bottom mud
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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
- C02F11/008—Sludge treatment by fixation or solidification
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic 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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- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a digestion and solidification treatment method for organic pollutant-heavy metal polluted bottom mud. The traditional sediment solidification and application have higher requirements on the strength of the solidified sediment and have high treatment cost. The invention provides a digestion and solidification treatment method of river and lake sediment, which comprises the steps of placing the sediment which is not dehydrated in a to-be-solidified area into a drum-type stirring device, adding 8-12% of quicklime, and digesting organic pollutants and microorganisms in the sediment; adding 8-12% of yellow sand, 12-18% of cement and 5-8% of calcium peroxide into the digested bottom mud, fully stirring, backfilling to the bottom of a river or lake, and moistening and maintaining for 10-15 days; and then planting the pollution-resistant submerged plants, and restoring water storage of rivers and lakes. The method can be used for carrying out in-situ treatment on the river and lake polluted bottom sediment, saves the treatment cost, can prevent the floating sediment from being generated on one hand, can provide a stable growing place for submerged plants on the other hand, and can reduce the secondary pollution and the limitation of resource utilization in the treatment process.
Description
Technical Field
The invention relates to polluted river and lake bottom mud repairing treatment; in particular to a digestion and solidification treatment method of organic pollutant-heavy metal polluted bottom mud.
Background
With the development of modern industry and frequent human activities, a large amount of pollutants are discharged into river channels, causing water body pollution. The bottom mud is used as an important component of water bodies of rivers and lakes and is a main accumulation place for pollutants entering rivers and lakes. Contaminants are stored in the bottom sludge by precipitation or particulate adsorption. When the water body environment changes, the stored organic and heavy metal pollutants can be released into the overlying water body again through the actions of physics, chemistry, biology and the like, and become secondary pollution sources influencing the water quality of the water body. Therefore, how to control and eliminate the pollutants in the bottom mud is an important aspect for improving the water quality of the water body in the rivers and the lakes.
At present, river and lake bottom mud is mainly removed from pollution to water quality of rivers and lakes by a dredging method. However, disposal of the dredged river and lake sediment is a difficult problem. The problems of large occupied area, high transportation cost and secondary pollution exist in the remote stacking. In addition, the pollution degree of the agricultural soil to the bottom mud and the requirement on the plant type are high in the resource utilization of the bottom mud, and the complex pollutants in the bottom mud can pollute the soil and underground water in the utilization process, so that the resource utilization limitation is large.
The bed mud curing is the most common method in bed mud treatment, and cement and lime are the curing agents commonly used therein. However, the cured strength is often insufficient for secondary use as a building material or the like. The curing strength is improved by increasing the addition amount of cement, and a large amount of hydration heat is generated to cause the generation of shrinkage cracks, so that the use is not facilitated. In addition, too high organic content in the substrate sludge may also affect its solidification effect.
Disclosure of Invention
The invention aims to solve the problems, provides a method for digesting and curing the bottom sludge polluted by organic pollutants and heavy metals, and provides a method for digesting and curing the bottom sludge of rivers and lakes, which can be used for digesting and removing the organic pollutants in the bottom sludge of rivers and lakes, curing the heavy metals and backfilling the processed bottom sludge in situ.
In order to achieve the purpose, the invention provides the following technical scheme:
a digestion and solidification treatment method for organic pollutant-heavy metal polluted bottom mud comprises the following steps:
digging out bottom mud in a to-be-solidified area, and conveying the bottom mud into a drum type stirring device of a storage yard;
taking the weight of river and lake bottom mud as a reference, adding 8-10% of quicklime into the bottom mud, and digesting organic matters and microorganisms in the bottom mud by utilizing high heat generated by the reaction of the quicklime and water in the bottom mud;
adding 8-12% of yellow sand, 12-18% of cement and 5-8% of calcium peroxide into the digested bottom mud, and fully stirring to obtain a curing precursor;
backfilling the cured precursor along the bottom surface of the river or lake, maintaining in the open air, periodically spraying water on the bottom mud mixture, maintaining for 10-15 days to obtain cured bottom mud with certain strength, wherein the treated bottom mud cannot be slimed when meeting water;
planting one or more pollution-resistant submerged plants in the solidified bottom mud, and storing water in rivers and lakes again.
Further, the content of calcium oxide in the quicklime is more than or equal to 90 percent; the cement is ordinary portland cement.
Further, the stain-resistant submerged plant is one or more of tape grass, malayan euglena, watermifoil and golden carp algae.
According to the invention, the heat generated by the reaction of the quicklime and the water in the bottom mud can be used for digesting and killing the organic pollutants and microorganisms in the bottom mud, and the alkalinity of the system after the reaction is increased, so that the heavy metal precipitation and solidification are facilitated. The calcium peroxide generates hydroxyl free radicals when meeting water to perform the oxidation removal effect on organic pollutants in the bottom mud.
The solidified bottom mud obtained by the treatment of the invention has moderate strength, the infinite compressive strength reaches 2.0Mpa, and the solidified bottom mud can not be argillized when meeting water, thereby avoiding the generation of floating mud after the river and lake store water again, simultaneously being capable of supporting the attachment growth of pollution-resistant submerged plants, being beneficial to the restoration of the ecological system of the river and lake and being beneficial to the long-term maintenance of water quality.
In summary, the advantages of the invention include the following:
(1) reacting quicklime with water in the bottom sludge to generate heat to digest organic matters and microorganisms in the bottom sludge;
(2) calcium peroxide generates hydroxyl radical when meeting water to oxidize organic pollutants in the bottom mud;
(3) the curing period is short, the treated bottom mud has certain strength and can not be slimed when meeting water, and floating mud is avoided;
(4) the sediment with certain strength is beneficial to the attachment growth of the pollution-resistant submerged plants and the acceleration of the ecological restoration of rivers and lakes.
(5) The river and lake in-situ backfill treatment is adopted, so that the cost of ex-situ transportation of bottom mud and secondary pollution are avoided, and the treatment cost is low;
Detailed Description
The following examples are given to illustrate specific embodiments of the present invention, but the present invention is not limited thereto.
The reagents used in the examples were obtained from commercial sources without specific indication.
Example 1:
curing sludge from lake bottom of Boai lake No. 1 in south sea area of Foshan City. The area of No. 1 lake of the Boai lake is about 20000m2The average water depth is 0.9 meter, the depth of floating mud is 0.15 meter, and the total water volume of No. 1 lake is 18000m3The floating mud amount is 3000m3(ii) a The water content of the float sludge is calculated according to 97 percent, and the specific gravity is about 1.007.
And pumping out the water of the lake No. 1, and building a simple storage yard in the water. Digging out the bottom mud of the area to be solidified by using a digging machine, and conveying the bottom mud into a drum type stirring device of a storage yard;
adding quicklime into a stirring device according to the proportion of 90% of the bottom mud and 8% of the quicklime, and continuously stirring for digestion reaction for 1.5 hours;
adding yellow sand, cement and calcium peroxide according to the proportion of 70 percent of digested bottom mud, 10 percent of yellow sand, 15 percent of cement and 5 percent of calcium peroxide, and continuously stirring for 30 minutes;
backfilling the uniformly stirred and mixed bottom mud mixture to the bottom of the lake, and maintaining for 15 days;
planting pollution-resistant submerged plants of tape grass and golden fish algae on the solidified bottom mud, and storing water in the lake again.
According to the solidified bottom mud obtained in the steps, the unlimited compressive strength obtained by adopting a press for detection is 2.0Mpa, the secondary suspension phenomenon of the bottom mud does not occur after the lake is re-stored, and the submerged plant is found to grow well by tracking observation for a period of time.
The digestion and solidification bottom mud obtained by the embodiment of the invention has proper strength and can be subjected to in-situ backfill treatment.
Example 2:
and (3) curing the sludge at the bottom of No. 2 lake in the Boai lake in the south sea area of the Foshan city. The lake area of Boai lake No. 2 is about 50000m2The average water depth is 0.9 meter, the depth of floating mud is 0.15 meter, and the total water volume of No. 2 lake is 45000m3The floating mud amount is 7500m3(ii) a The water content of the float sludge is calculated according to 97 percent, and the specific gravity is about 1.007.
And pumping water of lake No. 2, and building a simple storage yard in the lake. Digging out the bottom mud of the area to be solidified by using a digging machine, and conveying the bottom mud into a drum type stirring device of a storage yard;
adding quicklime into a stirring device according to the proportion of 90% of the bottom mud to 10% of the quicklime, and continuously stirring for digestion reaction for 2 hours;
adding yellow sand, cement and calcium peroxide according to the proportion of 65% of digested bottom mud, 12% of yellow sand, 18% of cement and 5% of calcium peroxide, and continuously stirring for 30 minutes;
backfilling the uniformly stirred and mixed bottom mud mixture to the bottom of the lake, and maintaining for 15 days;
planting soil-resistant submerged plants, namely potamogeton malabaricum and watermifoil, on the solidified bottom mud, and storing water in the lake again.
According to the solidified bottom mud obtained in the steps, the unlimited compressive strength obtained by adopting a press for detection is 2.2Mpa, the secondary suspension phenomenon of the bottom mud does not occur after the lake is re-stored, and the submerged plant is found to grow well by tracking observation for a period of time.
The solidified bottom mud with certain strength, which is obtained by the invention, lays a good foundation for the subsequent restoration of the river and lake ecological system and the long-term maintenance of water quality, and has sustainability.
The above embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above embodiment, and appropriate changes may be made without departing from the spirit of the present patent. It is understood that all other embodiments based on the present invention are within the scope of the present invention.
Claims (4)
1. The digestion and solidification treatment method for the organic pollutant-heavy metal polluted bottom mud is characterized by comprising the following steps:
(1) digging out the bottom mud to be polluted, and sending the bottom mud to a drum type stirring device of a yard; adding 8-10% of quicklime into the bottom sludge by taking the weight of the river and lake bottom sludge as a reference, and continuously stirring for reacting for 2 hours to obtain digested bottom sludge;
(2) taking the weight of the bottom mud obtained by the reaction in the step (1) as a reference, adding 8-12% of yellow sand, 12-18% of cement and 5-8% of calcium peroxide, and uniformly stirring to form a curing precursor;
(3) backfilling the solidified precursor along the bottom surface of the river or lake, maintaining in the open air, periodically spraying water on the bottom mud mixture, and maintaining for 10-15 days to obtain solidified bottom mud with certain strength;
(4) planting one or more pollution-resistant submerged plants in the solidified bottom mud, and storing water in rivers and lakes again.
2. The method for digesting and curing the organic pollutant-heavy metal polluted bottom mud according to claim 1, wherein the calcium oxide content of the quicklime in the step (1) is not less than 90%.
3. The method for digesting and curing the organic pollutant-heavy metal polluted bottom mud according to claim 1 or claim 2, is characterized in that the adopted cement is ordinary portland cement.
4. The method for digesting and solidifying organic pollutant-heavy metal polluted bottom mud according to claim 1, 2 or 3, characterized in that the selected pollution-resistant submerged plants are one or more of eel grass, malayan-eye herb, watermifoil and goldfish algae.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262201.0A CN112429925A (en) | 2020-11-12 | 2020-11-12 | Digestion and solidification treatment method for organic pollutant-heavy metal polluted bottom mud |
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| CN202011262201.0A CN112429925A (en) | 2020-11-12 | 2020-11-12 | Digestion and solidification treatment method for organic pollutant-heavy metal polluted bottom mud |
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| CN112429925A true CN112429925A (en) | 2021-03-02 |
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| CN202011262201.0A Pending CN112429925A (en) | 2020-11-12 | 2020-11-12 | Digestion and solidification treatment method for organic pollutant-heavy metal polluted bottom mud |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998051636A1 (en) * | 1997-05-15 | 1998-11-19 | Ecdc East, Lc | Method for treatment of dredged materials to form a structural fill |
| CN105110584A (en) * | 2015-08-03 | 2015-12-02 | 中国科学院水生生物研究所 | Cover material for black and odorous bottom mud slow flow shallow water riverway and repairing method |
| CN110981128A (en) * | 2019-11-29 | 2020-04-10 | 浙江省疏浚工程有限公司 | Method for building wetland through sludge backfill |
-
2020
- 2020-11-12 CN CN202011262201.0A patent/CN112429925A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998051636A1 (en) * | 1997-05-15 | 1998-11-19 | Ecdc East, Lc | Method for treatment of dredged materials to form a structural fill |
| CN105110584A (en) * | 2015-08-03 | 2015-12-02 | 中国科学院水生生物研究所 | Cover material for black and odorous bottom mud slow flow shallow water riverway and repairing method |
| CN110981128A (en) * | 2019-11-29 | 2020-04-10 | 浙江省疏浚工程有限公司 | Method for building wetland through sludge backfill |
Non-Patent Citations (2)
| Title |
|---|
| 何连生等: "《重金属污染调查与治理技术》", 31 December 2013, 中国环境出版社 * |
| 段云霞等: "《城市黑臭水体治理实用技术及案例分析 》", 31 March 2018, 天津大学出版社 * |
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Application publication date: 20210302 |