CN113816572A - Method for quickly dehydrating and curing foundation pit sludge - Google Patents
Method for quickly dehydrating and curing foundation pit sludge Download PDFInfo
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- CN113816572A CN113816572A CN202111103045.8A CN202111103045A CN113816572A CN 113816572 A CN113816572 A CN 113816572A CN 202111103045 A CN202111103045 A CN 202111103045A CN 113816572 A CN113816572 A CN 113816572A
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- sludge
- foundation pit
- quicklime
- mud
- solidifying
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the field of environmental geotechnical engineering, in particular to a method for quickly dehydrating and curing foundation pit sludge, which comprises the following steps: s1, the sludge in the foundation pit is pumped into a sludge treatment mud-water separator through a first mud pump which is connected with a punching hole and placed at the bottom of the sludge, so that the sludge is uniformly stirred and mud-water is separated; s2, screening the sludge after stirring and separating water along multiple layers of filter screens with different apertures under the action of gravity to obtain silt soil without large-particle impurities; s3, pumping the screened sludge into a drying pipe through a second slurry pump, and mixing the sludge and the quicklime through two nozzles for spraying quicklime powder arranged on the pipe and the wave-shaped design at the bottom of the device to perform chemical reaction so as to achieve the drying effect; and S4, performing filter pressing on the mixed sludge through a plate-and-frame filter press so as to filter press the sludge into a sludge cake. The invention can quickly obtain silt soil without large particle impurities and with high solidification degree, so as to achieve the purpose of treating the silt of the foundation pit and achieving the environmental protection.
Description
Technical Field
The invention relates to the field of environmental geotechnical engineering, in particular to a method for quickly dehydrating and curing foundation pit sludge.
Background
The sludge is cohesive soil which is deposited in still water or slow flowing water environment, is formed by biochemical action, has natural water content larger than a liquid limit and has natural pore ratio larger than or equal to 1.5. The sludge is engineering garbage soil with high water content, the water content of the engineering garbage soil is 1.2-2.0 times of the liquid limit water content, the engineering garbage soil is in a flowing state, the mechanical strength is low, the compressibility is strong, the engineering garbage soil almost has no strength, and the engineering garbage soil cannot be directly used for engineering. Meanwhile, the earthquake resistance is very poor, and the building foundation is easy to sink under the action of strong earthquake.
The land and land of China are vast, the number of rivers and lakes is countless, the amount of sludge is incomparable, along with the development of national economy and the development of urban construction, the development of coastal mudflats and the development of port construction are in deep water, a lot of projects have to be built on underwater soft soil foundations, and in order to ensure the safety and normal use of buildings, the underwater natural foundations need to be reinforced.
At present, the domestic resource utilization of the sludge mainly comprises methods such as mechanical treatment, hydraulic filling and land reclamation, physical dehydration, heat treatment, curing agent treatment and the like. Some of the treatment technologies pollute the surrounding environment, some have higher reinforcement cost, some have longer reinforcement time limit, some have unobvious reinforcement effect, some have limitation on construction window period, and some have more sludge amount for outward transportation.
The mechanical treatment can obtain a large amount of solidified soil, but the construction cost is high. Although the hydraulic reclamation land can be treated in a large scale, a large amount of foundation treatment cost is required to be invested after hydraulic reclamation, and the treatment period is long.
Therefore, a highly efficient, economical and environmentally friendly foundation treatment technology for sludge is needed to solve the above problems. Once successfully implemented, the method not only can promote the development of foundation pit silt foundation treatment technology, but also can well help coastal reclamation engineering and artificial island foundation treatment.
Based on the above reasons, the invention provides a method for quickly dehydrating and curing foundation pit silt, which is used for quickly obtaining silt soil with high curing degree and no large-particle impurities, by virtue of the characteristics of water absorption, water absorption and heat release of quicklime.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for quickly dehydrating and solidifying foundation pit sludge, which combines the action of a novel machine to quickly obtain silt soil which is free of large granular impurities and high in solidification degree on the basis of adding quicklime so as to achieve the aim of treating the foundation pit sludge and achieving the environment-friendly purpose.
In order to realize the purpose of the invention, the invention adopts the technical scheme that:
the invention discloses a method for quickly dehydrating and curing foundation pit sludge, which comprises the following steps:
s1, the sludge in the foundation pit is pumped into a sludge treatment mud-water separator through a first mud pump which is connected with a punching hole and placed at the bottom of the sludge, so that the sludge is uniformly stirred and mud-water is separated;
s2, screening the sludge after stirring and separating water along multiple layers of filter screens with different apertures under the action of gravity to obtain silt soil without large-particle impurities;
s3, pumping the screened sludge into a drying pipe through a second slurry pump, and mixing the sludge and the quicklime through two nozzles for spraying quicklime powder arranged on the pipe and the wave-shaped design at the bottom of the device to perform chemical reaction so as to achieve the drying effect;
and S4, performing filter pressing on the mixed sludge through a plate-and-frame filter press so as to filter press the sludge into a sludge cake.
In step S2, the apertures of the multiple layers of filter screens are gradually decreased from top to bottom.
In step S2, the distance between the upper filter screen and the feed inlet, the distance between the filter screens with different apertures, and the distance between the lower filter screen and the feed inlet are not less than 40cm, and the distance between the filter screens and the feed inlet should be greater than the distance between the upper filter screen and the middle filter screen.
In step S3, the quicklime and the sludge are combined by spraying quicklime powder through the nozzle and designing the wave shape of the bottom of the device.
In the step S3, after the sludge and the quicklime are uniformly mixed, the sludge is allowed to stand for not less than 45 minutes.
In the step S4, the filter pressing time of the plate-and-frame filter press is not less than 60 min.
The invention has the beneficial effects that:
1) the sewage entering the stirrer at different times is fully mixed, the water quality is uniform, and sludge precipitation is not easy to generate;
2) sludge is stirred by a sludge-water separator for sludge treatment, so that sludge and water are separated;
3) screening the sludge after stirring and separating water along a plurality of layers of filter screens with different apertures under the action of gravity to obtain sludge soil without large-particle impurities;
4) the design of the spray nozzle and the wave pattern at the bottom of the device can ensure that the silt soil is fully contacted with the quicklime, thereby achieving the optimal utilization rate of the quicklime and avoiding the investment of a large amount of manpower, material resources or large-scale instruments in the stirring process;
5) carrying out water absorption and heat release processes by using a chemical reaction of quicklime and water, thereby quickly obtaining dry silt soil;
6) carrying out filter pressing on the sludge through a plate-and-frame filter press, so that the water content of the sludge is further reduced;
7) the method for rapidly dehydrating and curing the foundation pit sludge provided by the embodiment of the invention can achieve the purpose of treating the foundation pit sludge to achieve environmental protection.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further illustrated below:
referring to fig. 1 of the drawings, a drawing,
the embodiment of the invention provides a method for quickly dehydrating and curing foundation pit sludge, which comprises the following steps:
s1, the sludge in the foundation pit is pumped into a sludge treatment mud-water separator through a first mud pump which is connected with a punching hole and placed at the bottom of the sludge, so that the sludge is uniformly stirred and mud-water is separated;
s2, screening the sludge after stirring and separating water along multiple layers of filter screens with different apertures under the action of gravity to obtain silt soil without large-particle impurities;
s3, pumping the screened sludge into a drying pipe through a second slurry pump, and mixing the sludge and the quicklime through two nozzles for spraying quicklime powder arranged on the pipe and the wave-shaped design of the bottom of the device to perform chemical reaction so as to achieve the drying effect;
and S4, performing filter pressing on the mixed sludge through a plate-and-frame filter press so as to filter press the sludge into a sludge cake.
Based on the arrangement, the embodiment of the invention for quickly dehydrating and curing the foundation pit sludge has the following advantages: by the step S1, sewage entering the stirrer at different times is fully mixed, the water quality is uniform, and sludge precipitation is not easy to generate;
the sludge treatment mud-water separator is used for stirring the sludge through the step S1, so that mud-water is separated;
through the setting step S2, the silt after stirring and separating water is screened along the multilayer filter screens with different apertures through the action of gravity, and silt soil without large-particle impurities is obtained;
by the step S3, the powdery quicklime sprayed by the nozzle and the wave-shaped design at the bottom of the device can be fully contacted with the silt soil, so that the optimal utilization rate of the quicklime is achieved, and the large amount of manpower, material resources or large-scale equipment is prevented from being input in the stirring process;
through the setting step S3, water absorption and heat release processes are carried out by utilizing the chemical reaction of quicklime and water, so that dry silt soil is quickly obtained;
through the step S4, the sludge is subjected to filter pressing through a plate-and-frame filter press, so that the water content of the sludge is further reduced;
therefore, the method for quickly dehydrating and curing the foundation pit sludge provided by the embodiment of the invention can achieve the purpose of treating the foundation pit sludge to achieve environmental protection.
In some embodiments, optionally, as shown in fig. 1, in step S1, the stirring rate of the stirrer of the mud-water separator for sludge treatment ensures that the sludge entering the inside thereof is uniformly stirred; furthermore, the stirring time of the stirrer ensures the stirring effect of the sludge. Meanwhile, the sludge-water separator for sludge treatment is used for ensuring sludge-water separation.
In some embodiments, optionally, as shown in fig. 1, in step S2, the mesh aperture of each portion of the screen is optional.
In some embodiments, optionally, as shown in fig. 1, the drying tube device may be adapted to combine the sludge and the quicklime to chemically react so that the sludge becomes a pasty slurry in step S3. The design of the spray nozzle and the raised grains at the bottom of the device can ensure that the quicklime can be fully contacted with the sludge.
In some embodiments, optionally, as shown in fig. 1, in step S3, after the sludge is uniformly stirred, the sludge is left to stand for not less than 45 min.
In some embodiments, optionally, as shown in fig. 1, in step S4, the filter pressing time of the plate-and-frame filter press is not less than 60min, so as to ensure the filter pressing effect of the plate-and-frame filter press, and further reduce the water content of the mud cake.
In summary, the method for quickly dehydrating and curing the foundation pit sludge provided by the embodiment of the invention has the following advantages:
by the step S1, sewage entering the stirrer at different times is fully mixed, the water quality is uniform, and sludge precipitation is not easy to generate;
the sludge treatment mud-water separator is used for stirring the sludge through the step S1, so that mud-water is separated;
through the step S2, the silt after the water is stirred and separated is screened along the multilayer filter screens with different apertures under the action of gravity, and silt soil without large-particle impurities is obtained
By the step S3, the silt soil can be fully contacted with the quicklime through the nozzle and the wave design at the bottom of the device, the optimal utilization rate of the quicklime is achieved, and the large amount of manpower, material resources or large-scale equipment is prevented from being input in the stirring process;
through the setting step S3, water absorption and heat release processes are carried out by utilizing the chemical reaction of quicklime and water, so that dry silt soil is quickly obtained;
through the step S4, the sludge is subjected to filter pressing through a plate-and-frame filter press, so that the water content of the sludge is further reduced;
therefore, the method for quickly dehydrating and curing the foundation pit sludge provided by the embodiment of the invention can achieve the purpose of treating the foundation pit sludge to achieve environmental protection.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention and the contents of the drawings or directly or indirectly applied to the related technical fields are included in the scope of the present invention.
Claims (6)
1. A method for quickly dehydrating and solidifying foundation pit sludge is characterized by comprising the following steps:
s1, the sludge in the foundation pit is pumped into a sludge treatment mud-water separator through a first mud pump which is connected with a punching hole and placed at the bottom of the sludge, so that the sludge is uniformly stirred and mud-water is separated;
s2, screening the sludge after stirring and separating water along multiple layers of filter screens with different apertures under the action of gravity to obtain silt soil without large-particle impurities;
s3, pumping the screened sludge into a drying pipe through a second slurry pump, and mixing the sludge and the quicklime through two nozzles for spraying quicklime powder arranged on the pipe and the wave-shaped design at the bottom of the device to perform chemical reaction so as to achieve the drying effect;
and S4, performing filter pressing on the mixed sludge through a plate-and-frame filter press so as to filter press the sludge into a sludge cake.
2. The method for rapidly dewatering and solidifying foundation ditch sludge according to claim 1, wherein in the step S2, the pore size of the multi-layer filter screen is gradually reduced from top to bottom.
3. The method for rapidly dewatering and solidifying foundation ditch sludge according to claim 1, wherein in the step S2, the distance between the upper screen and the feeding hole, the distance between the screens with different apertures, and the distance between the lower screen and the discharging hole are not less than 40cm, and the distance between the screen and the feeding hole is greater than the distance between the upper screen and the middle screen.
4. The method for rapidly dehydrating and solidifying foundation pit sludge according to claim 1, wherein in the step S3, quicklime is combined with the sludge by spraying quicklime powder through a nozzle and designing the bottom of the device to be wavy.
5. The method for rapidly dehydrating and solidifying the foundation pit sludge as claimed in claim 1, wherein in the step S3, after the sludge is uniformly mixed with the quicklime, the sludge is allowed to stand for no less than 45 minutes.
6. The method for rapidly dehydrating and solidifying the foundation pit sludge according to claim 1, wherein in the step S4, the filter pressing time of the plate and frame filter press is not less than 60 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111103045.8A CN113816572B (en) | 2021-09-18 | 2021-09-18 | Method for quickly dehydrating and curing foundation pit sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111103045.8A CN113816572B (en) | 2021-09-18 | 2021-09-18 | Method for quickly dehydrating and curing foundation pit sludge |
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| Publication Number | Publication Date |
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| CN113816572A true CN113816572A (en) | 2021-12-21 |
| CN113816572B CN113816572B (en) | 2023-04-07 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9925858D0 (en) * | 1998-10-30 | 1999-12-29 | Doyle Lawrence T | A process and apparatus for treating waste material |
| JP2001170691A (en) * | 1999-12-17 | 2001-06-26 | Hitachi Constr Mach Co Ltd | Mud solidifying treatment device |
| CN102311215A (en) * | 2011-07-30 | 2012-01-11 | 华电电力科学研究院 | Urban life sludge locally self-circulation comprehensive utilization device and method |
| CN102674657A (en) * | 2012-06-11 | 2012-09-19 | 安徽国祯环保节能科技股份有限公司 | Sludge dewatering method for urban sewage plant |
| CN203513457U (en) * | 2013-10-30 | 2014-04-02 | 杭州楚天科技有限公司 | Sludge drying treatment device |
| CN105859068A (en) * | 2016-06-20 | 2016-08-17 | 广州市水电建设工程有限公司 | Sludge treatment process |
| CN108164032A (en) * | 2017-12-29 | 2018-06-15 | 长沙风正未来环保科技有限公司 | A kind of final precipitation process equipment in the Heihe road with hardness determination |
| CN112661386A (en) * | 2020-12-31 | 2021-04-16 | 广东大禹水利建设有限公司 | Reservoir sludge dewatering and curing method |
-
2021
- 2021-09-18 CN CN202111103045.8A patent/CN113816572B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9925858D0 (en) * | 1998-10-30 | 1999-12-29 | Doyle Lawrence T | A process and apparatus for treating waste material |
| JP2001170691A (en) * | 1999-12-17 | 2001-06-26 | Hitachi Constr Mach Co Ltd | Mud solidifying treatment device |
| CN102311215A (en) * | 2011-07-30 | 2012-01-11 | 华电电力科学研究院 | Urban life sludge locally self-circulation comprehensive utilization device and method |
| CN102674657A (en) * | 2012-06-11 | 2012-09-19 | 安徽国祯环保节能科技股份有限公司 | Sludge dewatering method for urban sewage plant |
| CN203513457U (en) * | 2013-10-30 | 2014-04-02 | 杭州楚天科技有限公司 | Sludge drying treatment device |
| CN105859068A (en) * | 2016-06-20 | 2016-08-17 | 广州市水电建设工程有限公司 | Sludge treatment process |
| CN108164032A (en) * | 2017-12-29 | 2018-06-15 | 长沙风正未来环保科技有限公司 | A kind of final precipitation process equipment in the Heihe road with hardness determination |
| CN112661386A (en) * | 2020-12-31 | 2021-04-16 | 广东大禹水利建设有限公司 | Reservoir sludge dewatering and curing method |
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