CN110593248A - Method for promoting rapid dehydration of dredged fluid mud based on straw fermentation - Google Patents
Method for promoting rapid dehydration of dredged fluid mud based on straw fermentation Download PDFInfo
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- CN110593248A CN110593248A CN201910850953.XA CN201910850953A CN110593248A CN 110593248 A CN110593248 A CN 110593248A CN 201910850953 A CN201910850953 A CN 201910850953A CN 110593248 A CN110593248 A CN 110593248A
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- dredged
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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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
- E02D3/103—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by installing wick drains or sand bags
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0053—Production methods using suction or vacuum techniques
Abstract
The invention relates to a method for promoting rapid dehydration of dredged fluid mud based on straw fermentation, wherein a vertical fermentation body and a vertical drainage body are arranged in the dredged fluid mud, and straws in the vertical fermentation body are stirred with zymophyte in advance and are filled into a soil engineering bag and then are pumped into the dredged fluid mud; the vertical drainage body is directly driven into the dredged fluid mud to be used as a drainage body during vacuum pumping; a large amount of heat and gas are generated in the fermentation process of the straws in the vertical fermentation body, the heat accelerates the vaporization of water in the dredged fluid mud in a vacuum state, and the gas expands the vertical fermentation body, so that the peripheral dredged fluid mud is extruded, positive pressure is formed in the dredged fluid mud, and the drainage is accelerated; the invention utilizes the characteristics of heat production and gas production of the straws in the fermentation process to realize various effective dehydration effects such as heat consolidation, heat evaporation, air pressure loading and the like on the dredged fluid-state mud.
Description
Technical Field
The invention relates to a method for promoting rapid dehydration of dredged fluid mud based on straw fermentation, and belongs to the technical fields of civil engineering, waste utilization, energy conservation, environmental protection and the like.
Background
The projects of river and lake dredging, port and channel construction and the like inevitably produce a large amount of dredged fluid mud, and the fluid mud produced in the dredging projects is transported to a mud piling field on the shore by adopting a pipeline to be piled. Because the intensity of the fluid mud is almost zero, a storage yard for storing the fluid mud can not enter people for a long time, and the waste of land resources is caused.
In order to improve the capability of storing dredged fluid mud in a pile mud yard, rapidly reduce the water content of the fluid mud and improve the strength of the fluid mud, and convert the pile mud yard into available land resources in a relatively short time, various methods for rapidly reducing the water content of the fluid mud in the pile yard are provided in the engineering industry, such as the most commonly used rapid dehydration technology-vacuum preloading technology of the fluid mud pile yard at present.
However, when the vacuum preloading technology is adopted for rapid dehydration treatment, the drainage body is often blocked, so some scholars improve the vacuum preloading technology, for example, the invention with the application number of 201510457681.9 discloses a method for treating a foundation by combining stirring flocculation dehydration and vacuum preloading, which comprises the following steps: A. gradually driving the self-propelled stirring device to a target area, enabling a stirring rod of the self-propelled stirring device to go deep into the sludge and continuously stir the sludge in the driving process of the self-propelled stirring device, injecting a flocculating agent into the sludge by the stirring rod in the stirring process, and then inserting a vertical drainage plate into the sludge into which the flocculating agent is injected; B. connecting the upper end of the vertical drainage plate with a drainage pipeline, connecting the drainage pipeline with the outside, covering sealing cloth on the top of soil in the vacuum preloading water reducing pool and the drainage pipeline, sealing the edges of the sealing cloth with the soil by adopting a sealing structure, and connecting a vacuum pump with the drainage pipeline and pumping water in the soil; C. after the vacuum preloading is finished, removing the vacuum sealing cloth on the surface, and dismantling the drainage pipeline and the vertical drainage pipe; although the method overcomes the problem that the vertical drainage plate is blocked by fine silt particles to a certain extent, the method also has the phenomenon that the drainage body is blocked by large silt to finally cause poor treatment in essence; other scholars propose a pressure vacuum technology, for example, the invention with the application number of 201810436403.9 discloses a sludge dewatering and conveying device and a dewatering method, the device comprises a sludge dewatering tank, a water-vapor separation tank, a vacuum pump and a sludge dewatering and air discharging mechanism; the sludge dewatering tank adsorbs the sludge into the sludge dewatering tank through negative pressure generated by the vacuum pump, the sludge dewatering and air discharging mechanism sprays air pressure on the sludge in the sludge dewatering tank to enable a sludge layer to extrude water molecules upwards, and a water layer on the top of the sludge and the water molecules are collected into the water-vapor separation tank through the sludge dewatering and air discharging mechanism; although the method achieves a certain effect, other channels are required to be arranged in the structure as sludge discharge channels, and a special loading device is required, so that the construction cost is further increased; in addition, fluid mud dredged from various water areas often has no nutrients required by plant growth, is hardened and airtight after being solidified by self weight, and particularly contains a large amount of salt in the dredged fluid mud of the ocean, so that the dredged fluid mud is not suitable for the growth of crops.
In order to respond to the national call for promoting the resource utilization of the straws, some scholars propose that the straws are adopted as water drainage bodies, and the water drainage bodies of the straws can play a nutrient role after being degraded, however, the straw degradation process is relatively long; in conclusion, how to quickly convert the fluid mud into a soil resource which has certain strength and good ecological performance is a key engineering problem to be solved in the current fluid mud treatment.
Disclosure of Invention
The invention provides a method for promoting rapid dehydration of dredged fluid mud based on straw fermentation, which utilizes the characteristics of heat production and gas production of straws in the fermentation process to realize various effective dehydration effects of thermal consolidation, thermal volatilization, positive pressure loading and the like on the dredged fluid mud.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for promoting rapid dehydration of dredged fluid mud based on straw fermentation comprises the following steps:
the first step is as follows: taking straws as materials, and manufacturing a plurality of vertical fermentation bodies, a plurality of vertical drainage bodies and a plurality of straw cushion layers;
the second step is that: inserting a plurality of manufactured vertical drainage bodies into the dredged fluid mud, and inserting one end of an air exhaust connecting pipe from the top of each vertical drainage body;
the third step: vertical fermentation bodies are inserted between the adjacent vertical drainage bodies, one end of the exhaust connecting pipe is inserted from the top of each vertical fermentation body, and a distance is reserved between the top of each vertical fermentation body and the surface of the dredged fluid mud;
the fourth step: laying a straw cushion layer and geotextile in sequence from bottom to top in the horizontal direction of the surface of the dredged fluid mud, burying an exhaust pipe and an exhaust pipe in the straw cushion layer, wherein the exhaust pipe is positioned below the exhaust pipe, the other end of each exhaust connecting pipe is communicated with the exhaust pipe, and the other end of each exhaust connecting pipe is communicated with the exhaust pipe;
the fifth step: laying a plastic sealing film on the surface of the geotextile;
and a sixth step: one end of the exhaust pipe is communicated with the gas collecting device through an exhaust valve, and one end of the exhaust pipe is communicated with the gas extracting device through an exhaust valve;
the seventh step: starting air extraction equipment, closing an exhaust valve, and vacuumizing the dredged fluid mud;
eighth step: and after continuously vacuumizing the dredged fluid mud for 2-3 months, basically eliminating the drainage in the dredged fluid mud, and finishing the whole dehydration process.
The ninth step: opening an exhaust valve, starting a gas collecting device, and collecting residual gas in the vertical fermentation body;
as a further preferred aspect of the present invention, the vertical fermentation body comprises the following steps: crushing the straws until the length of the straws is less than 5cm, stirring the crushed straws and a straw leavening agent, wherein the weight of the straw leavening agent is 0.3-0.7% of the weight of the crushed straws, and putting the stirred straws into a geotextile bag;
in a further preferred embodiment of the present invention, the crushed straw in the vertical fermentation body accounts for 75% of the total weight, the poultry manure accounts for 24% of the total weight, and the low-temperature fermentation agent accounts for 0.5% of the weight of the crushed straw;
as a further preferred aspect of the present invention, the density of the vertical fermentation medium is in the range of 50 to 200kg/m3The diameter range of the vertical fermentation body is 10cm-30cm, and the distance between the top end of the vertical fermentation body and the surface of the dredged fluid mud is 0.5 m;
as a further preferred aspect of the present invention, the vertical drainage body comprises the following manufacturing steps: binding a plurality of straws with the diameter of 1cm-3cm to form a strip-shaped structure, and placing the strip-shaped structure in a geotextile bag with the same diameter, wherein the diameter range of the strip-shaped structure is 5cm-20 cm;
as a further preferred aspect of the present invention, the density of the vertical drainage body is in the range of 50kg/m3-150kg/m3；
As a further preferred aspect of the present invention, a plurality of vertical drainage bodies are inserted into the dredging fluid mud in a plum blossom shape, or a plurality of vertical drainage bodies are inserted into the dredging fluid mud in a square matrix shape, and a distance between two adjacent vertical drainage bodies is in a range of 60cm to 180 cm;
as a further preferred mode of the present invention, the surface of the exhaust pipe is uniformly provided with a plurality of small holes, and the diameter of each small hole is 0.5 cm.
As a further preferable mode of the present invention, the straw mat layer is a straw mat woven by straw, and the thickness of the straw mat layer is 30 cm.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the water in the dredged fluid mud can be accelerated to be vaporized in a vacuum state according to the heat generated by the self fermentation of the fermentation body made of the straws;
2. according to a large amount of gas generated by self fermentation of the fermentation body made of the straws, the fermentation body is expanded, so that the peripheral dredged fluid mud is extruded to form positive pressure finally, and drainage is accelerated;
3. the invention utilizes the characteristics of heat production and gas production in the straw fermentation process to generate the rapid dehydration effect coupled by various modes such as thermal consolidation, thermal vaporization, expansion pressurization and the like on the dredged fluid-state mud in the vacuum negative pressure state.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic overall structure of a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a plurality of vertical drainage bodies of the preferred embodiment of the present invention inserted into the dredging fluid mud in a quincunx shape;
fig. 3 is a schematic view of a plurality of vertical drainage bodies according to the preferred embodiment of the present invention inserted into the dredging fluid mud in a square matrix.
In the figure: 1 is vertical fermentation body, 2 is vertical drainage body, 3 is the connecting pipe of bleeding, 4 are the exhaust connecting pipe, 5 are the exhaust tube, 6 are the blast pipe, 7 are the straw bed course, 8 are geotechnological cloth, 9 are the plastics seal membrane, 10 are discharge valve, 11 are the bleeder valve.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1 to 3, the characteristic structure of the present invention includes: 1 is vertical fermentation body, 2 is vertical drainage body, 3 is the connecting pipe of bleeding, 4 are the exhaust connecting pipe, 5 are the exhaust tube, 6 are the blast pipe, 7 are the straw bed course, 8 are geotechnological cloth, 9 are the plastics seal membrane, 10 are discharge valve, 11 are the bleeder valve.
The invention relates to a novel fluid mud rapid dehydration technology based on soil mechanics, vacuum preloading, positive pressure increasing, thermal vaporization and other effects, which comprises the following specific operation steps in a preferred embodiment:
a method for promoting rapid dehydration of dredged fluid mud based on straw fermentation comprises the following steps:
the first step is as follows: taking straws as materials, and manufacturing a plurality of vertical fermentation bodies, a plurality of vertical drainage bodies and a plurality of straw cushion layers;
wherein, the manufacturing process of the vertical fermentation body is as follows: crushing the straws until the length of all the straws is less than 5cm, mixing and stirring the crushed straws and a straw leavening agent, wherein the straw leavening agent preferably uses a mixture of a low-temperature leavening agent and poultry excrement, the crushed straws account for 75% of the total weight, the poultry excrement accounts for 24% of the total weight, and the low-temperature leavening agent accounts for 0.5% of the weight of the crushed straws; mixing straw, low temperature starter, poultry feces, etc., and compacting the mixture to 100kg/m by manual compacting method3Then the mixture is put into a geotextile bag, and the diameter of the vertical fermentation body is ensured to be 20 cm;
it is noted that the density of the vertical fermentation body is mainly determined according to the comprehensive factors such as fermentation time, sludge vacuum negative pressure treatment time and the like, so that the fermentation time can reach more than 1 month, the fermentation is too fast, the vacuum negative pressure treatment starts, the fermentation is finished, the fermentation is too slow, sufficient heat and gas cannot be generated, and the effect cannot be achieved; therefore, the fermentation rate is adjusted by controlling the straw density, the diameter of a fermentation body and the like so as to be prepared with vacuum negative pressure treatment; because the vacuum negative pressure treatment time is related to the water content, the soil property and the like of the sludge, the density, the diameter and the like of the fermentation body need to be formulated according to actual conditions; the manufacturing process of the vertical drainage body comprises the following steps: in the preferred embodiment of the application, the diameter of the strip-shaped structure is 13cm, and tests show that the larger the diameter of the strip-shaped structure (namely a drainage body), the better the effect of treating the dredged mud is, but the larger the diameter is, the more difficult the construction is, and because the traditional vacuum negative pressure is used for treating the sludge, a sand well with the diameter of about 7-10cm is adopted; the construction and drainage effects are comprehensively considered, the diameter of the vertical drainage body is between 5 and 20cm, and the diameter of the vertical drainage body is 13cm in the preferred embodiment of the application;
the strip-shaped structure formed by bundling a plurality of straws is a common straw rope in daily life, and is a straw product which is processed by a special straw rope machine by taking the straws as raw materials;
placing a plurality of strip-shaped structures into the geotextile bag to ensure that the density of the geotextile bag is 100kg/m3Left and right; the initial density of the drainage is very complicated, the larger the density of the drainage body is, the poorer the drainage performance is, but the more difficult the compression is under the vacuum action, so that the diameter of the drainage body is larger; the density of the drainage body is small, although the permeability coefficient is large, the drainage body can be compressed under the action of vacuum, so that the diameter of the drainage body is small in the treatment process, and the treatment effect is influenced; so the density, compression and other rules of the straw drainage body under the vacuum action are considered; because the dredged mud is treated by the vacuum negative pressure, the optimal vacuum negative pressure generally exists, so that the factors such as the size of the vacuum negative pressure, the compression of the drainage body and the like need to be comprehensively considered when the density and the diameter of the drainage body are selected.
It is to be noted that the top of each vertical drainage body is connected with one end of an air exhaust connecting pipe, the top of each vertical fermentation body is connected with one end of an air exhaust connecting pipe, and the air exhaust connecting pipe are hoses;
the second step is that: a plurality of vertical drainage bodies are driven into the dredged fluid mud, the driven shape can be plum blossom shape or square shape, and the distance between the adjacent vertical drainage bodies is set between 60cm and 180 cm;
the third step: vertical fermentation bodies are driven between the adjacent vertical drainage bodies, and the length of the whole vertical fermentation body is 0.5m shorter than the thickness of the dredged fluid mud, so that a space of 0.5m is reserved between the top of each vertical fermentation body and the surface of the dredged fluid mud;
the sludge at the top end of the fermentation body is mainly used for isolating the connection between the fermentation body and the vertical drainage body, and because the vertical drainage body needs to be vacuumized, if the vertical fermentation body is buried too shallowly, the vacuum degree in the vertical drainage body can be transmitted to the vertical fermentation body through the overlying sludge layer to influence the fermentation of the vertical fermentation body, but the vertical fermentation body is buried too deeply, so that the construction is relatively difficult; therefore, indoor tests show that when the sludge is covered by 50cm, the vertical fermentation body can be sealed;
the fourth step: laying a straw cushion layer and geotextile in sequence from bottom to top on the surface of the dredged fluid mud, embedding an exhaust pipe and an exhaust pipe in the straw cushion layer, wherein the exhaust pipe is positioned below the exhaust pipe, the other ends of all the exhaust connecting pipes are communicated with the exhaust pipe, and the other ends of all the exhaust connecting pipes are communicated with the exhaust pipe;
the straw cushion layer is woven by straw to form the straw mat, the thickness of the straw mat is about 30cm, the air exhaust pipe and the exhaust pipe are both made of PVC pipes with the diameter of 5cm-10cm, a plurality of small holes are uniformly formed in the air exhaust pipe, and the diameter of each small hole is 0.5 cm;
the straw mat is a flexible straw-stem woven mat, and is a common tool in the traditional market;
the fifth step: laying a layer of plastic sealing film on the surface of the geotextile;
and a sixth step: one end of the exhaust pipe is communicated with a gas collecting device positioned outside the plastic sealing film, and one end of the exhaust pipe is communicated with an air exhaust device;
the seventh step: opening an air extraction valve on the air extraction equipment, closing an exhaust valve, pumping water to the vertical drainage body, and vacuumizing to dredge fluid mud;
eighth step: continuously vacuumizing the dredged fluid mud for 2-3 months, and ending the whole dehydration process, wherein the drainage in the dredged fluid mud is basically zero;
the ninth step: and opening an exhaust valve, starting the gas collecting equipment, and collecting residual gas in the vertical fermentation body.
In the technology, a vertical fermentation body and a vertical drainage body are arranged in the dredged fluid mud, and straws in the vertical fermentation body are stirred with zymophyte in advance, filled into a soil engineering bag and then are pumped into the dredged fluid mud; the straws in the vertical fermentation body can be fermented to generate a large amount of heat and gas, the vaporization of water in the dredged fluid mud in a vacuum state can be accelerated by the large amount of heat, and the expansion of the vertical fermentation body can be realized by the large amount of gas, so that the extrusion effect on the peripheral dredged fluid mud is generated, and positive pressure is formed in the dredged fluid mud to accelerate water drainage;
the vertical drainage body is directly driven into the dredged fluid mud and is used as a drainage body during vacuum pumping;
through the above, as shown in fig. 1, a dewatering structure based on the dewatering method of the present application is formed, in the dredged fluid mud, a vertical fermentation body is inserted between every two adjacent vertical drainage bodies, a plurality of vertical drainage bodies are driven into the dredged fluid mud, the driven shape is shown in fig. 2, which can be plum blossom shape, fig. 3, which can also be square matrix shape, the distance between the adjacent vertical drainage bodies is set between 60cm-180cm, wherein 0.5m is arranged between the top of the vertical fermentation body and the surface of the dredged fluid mud, a straw cushion layer is laid on the surface of the dredged fluid mud, an exhaust pipe and an exhaust pipe are buried in the straw cushion layer, the exhaust pipe is positioned below the exhaust pipe,
wherein the top of each vertical fermentation body is provided with an exhaust connecting pipe, all the exhaust connecting pipes are communicated with an exhaust pipe, the top of each vertical drainage body is provided with an air exhaust connecting pipe, all the air exhaust connecting pipes are communicated with an air exhaust pipe,
and laying a layer of geotextile on the surface of the straw cushion layer, and laying a layer of plastic sealing film on the surface of the geotextile.
Based on the above, the invention has the innovation that the characteristics of heat production and gas production in the straw fermentation process are utilized to generate various rapid dehydration effects such as thermal consolidation, thermal volatilization, positive pressure extrusion and the like on the dredged fluid mud.
Experiments of the preferred embodiment of the application verify that after the dredged fluid mud is continuously vacuumized for 3 months, the drainage in the dredged fluid mud is basically zero, the ground on the top layer of the storage yard integrally descends by about 500mm, the bearing capacity of the foundation reaches 30Kpa after detection, and the purpose of rapid dehydration is achieved.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A method for promoting rapid dehydration of dredged fluid mud based on straw fermentation is characterized in that: the method comprises the following steps:
the first step is as follows: taking straws as materials, and manufacturing a plurality of vertical fermentation bodies, a plurality of vertical drainage bodies and a plurality of straw cushion layers;
the second step is that: inserting a plurality of manufactured vertical drainage bodies into the dredged fluid mud, and inserting one end of an air exhaust connecting pipe from the top of each vertical drainage body;
the third step: vertical fermentation bodies are inserted between the adjacent vertical drainage bodies, one end of the exhaust connecting pipe is inserted from the top of each vertical fermentation body, and a distance is reserved between the top of each vertical fermentation body and the surface of the dredged fluid mud;
the fourth step: laying a straw cushion layer and geotextile in sequence from bottom to top in the horizontal direction of the surface of the dredged fluid mud, burying an exhaust pipe and an exhaust pipe in the straw cushion layer, wherein the exhaust pipe is positioned below the exhaust pipe, the other end of each exhaust connecting pipe is communicated with the exhaust pipe, and the other end of each exhaust connecting pipe is communicated with the exhaust pipe;
the fifth step: laying a plastic sealing film on the surface of the geotextile;
and a sixth step: one end of the exhaust pipe is communicated with the gas collecting device through an exhaust valve, and one end of the exhaust pipe is communicated with the gas extracting device through an exhaust valve;
the seventh step: starting air extraction equipment, closing an exhaust valve, and vacuumizing the dredged fluid mud;
eighth step: continuously vacuumizing the dredged fluid mud for 2-3 months, and ending the whole dehydration process, wherein the drainage in the dredged fluid mud is basically zero;
the ninth step: and opening an exhaust valve, starting the gas collecting equipment, and collecting residual gas in the vertical fermentation body.
2. The method for promoting rapid dehydration of dredged fluid mud based on straw fermentation of claim 1, wherein:
the vertical fermentation body comprises the following manufacturing steps: crushing the straws until the length of the straws is less than 5cm, stirring the crushed straws and a straw leavening agent, wherein the weight of the straw leavening agent is 0.3-0.7% of the weight of the crushed straws, and filling the stirred straws into a geotextile bag.
3. The method for promoting rapid dehydration of dredged fluid mud based on straw fermentation of claim 2, wherein: the weight of the crushed straws in the vertical fermentation body is 75 percent of the total weight, the weight of the poultry manure is 24 percent of the total weight, and the weight of the low-temperature fermentation agent is 0.5 percent of the weight of the crushed straws.
4. The method for promoting rapid dehydration of dredged fluid mud based on straw fermentation of claim 2, wherein: the density of the vertical fermentation body ranges from 50kg/m to 200kg/m3The diameter range of the vertical fermentation body is 10cm-30cm, and the distance between the top end of the vertical fermentation body and the surface of the dredged fluid mud is 0.5 m.
5. The method for promoting rapid dehydration of dredged fluid mud based on straw fermentation of claim 1, wherein:
the vertical drainage body comprises the following manufacturing steps: a plurality of straws with the diameter of 1cm-3cm are selected and bundled to form a strip-shaped structure, and the strip-shaped structure is placed in a geotextile bag with the same diameter, wherein the diameter range of the strip-shaped structure is 5cm-20 cm.
6. The method for promoting rapid dehydration of dredged fluid mud based on straw fermentation of claim 5, wherein: the density of the vertical drainage body ranges from 50kg/m3-150kg/m3。
7. The method for promoting rapid dehydration of dredged fluid mud based on straw fermentation of claim 1, wherein: the vertical drainage bodies are inserted into the dredged fluid mud in a plum blossom shape or in a square matrix shape, and the distance between every two adjacent vertical drainage bodies ranges from 60cm to 180 cm.
8. The method for promoting rapid dehydration of dredged fluid mud based on straw fermentation of claim 1, wherein: the surface of the exhaust pipe is uniformly provided with a plurality of small holes, and the diameter of each small hole is 0.5 cm.
9. The method for promoting rapid dehydration of dredged fluid mud based on straw fermentation of claim 1, wherein: the straw cushion layer is a straw mat woven by straw, and the thickness of the straw cushion layer is 30 cm.
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| CN111995211A (en) * | 2020-08-13 | 2020-11-27 | 盐城工学院 | Fluidized mud heat-pressure coupling deep dehydration device and dehydration method based on straw bioenergy |
| CN112136725A (en) * | 2020-08-28 | 2020-12-29 | 盐城工学院 | Method for treating fluid mud by biological combined vacuum preloading |
| CN112279484A (en) * | 2020-10-19 | 2021-01-29 | 上海市城市建设设计研究总院（集团）有限公司 | Vacuum combined pressurizing sludge and slurry rapid dewatering device |
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| CN102815854A (en) * | 2012-08-28 | 2012-12-12 | 江苏江达生态科技有限公司 | Method for promoting rapid drying of dredged silt by microorganism |
| CN104372789A (en) * | 2014-11-26 | 2015-02-25 | 盐城工学院 | Drainage system used for drainage consolidation of high-water-content sludge and new dredger fill |
| CN106284277A (en) * | 2016-08-22 | 2017-01-04 | 南京新都地下工程研究院有限公司 | A kind of air sac pressing draining combined vacuum precompressed foundation reinforcement method |
| CN109914385A (en) * | 2019-03-22 | 2019-06-21 | 黄虎 | A kind of method of hydraulic structure treatment of soft foundation |
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| CN112136725A (en) * | 2020-08-28 | 2020-12-29 | 盐城工学院 | Method for treating fluid mud by biological combined vacuum preloading |
| CN112136725B (en) * | 2020-08-28 | 2022-07-05 | 盐城工学院 | Method for treating fluid mud by biological combined vacuum preloading |
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Application publication date: 20191220 |