CN107226597B - Special reagent for sludge treatment and use method thereof - Google Patents
Special reagent for sludge treatment and use method thereof Download PDFInfo
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- CN107226597B CN107226597B CN201710640962.7A CN201710640962A CN107226597B CN 107226597 B CN107226597 B CN 107226597B CN 201710640962 A CN201710640962 A CN 201710640962A CN 107226597 B CN107226597 B CN 107226597B
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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
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Abstract
The invention discloses a special reagent for sludge treatment, which comprises, by mass, 120-300 parts of cement, 250-500 parts of quicklime, 0.5-3.0 parts of aluminum powder, 3-6 parts of a water reducing agent, 5-10 parts of an accelerator and 0.02-0.1 part of a foam stabilizer. The invention also provides a use method of the special reagent for sludge treatment. The method has the characteristics that the sludge dehydration rate can be improved, the residual moisture of the sludge after dehydration is less, and the dehydrated sludge has better engineering property.
Description
Technical Field
The invention relates to the technical field of sludge treatment; in particular to a special reagent for sludge treatment and a use method thereof.
Background
The rapid economic development of China brings the high tide of engineering construction of water conservancy and port and channel, and a large amount of waste sludge is inevitably generated in the dredging and widening processes of various river channels and in port new construction and extension engineering. According to incomplete statistics, the sludge discarded in China each year reaches hundreds of millions of cubic meters: wherein, coastal areas such as east sea and north sea generate considerable amount of sludge, and the amount of the sludge generated by the dredging engineering amount of the inland riverway is also considerable in order to ensure that the riverway can maintain normal flood discharge capability and ensure the smoothness of the inland waterway. At present, most of inland dredging sludge is abandoned in land dumping areas or low-lying areas, some occupy original fish ponds or ploughed fields, the land is precious at present, and land acquisition cost is high, for example, the expenditure of land acquisition in the first period of northeast China Water China is about 60 percent of the total project cost.
The existing sludge treatment method mainly aims at dewatering, and the sludge treatment method commonly used in engineering is to squeeze out moisture in sludge by using external force. Chinese patent CN101219297A discloses a U-shaped low-vacuum dredging sludge rapid drainage method, which is characterized in that a plurality of rows of U-shaped sand bags are erected on a cofferdam foundation, wherein two ends of each U-shaped sand bag are respectively connected with a horizontal longitudinal drainage pipeline and a horizontal longitudinal air duct through a first horizontal transverse drainage pipe or a second horizontal transverse drainage pipe, the horizontal longitudinal drainage pipeline is connected with a vacuumizing device, and the horizontal longitudinal air duct is connected with an air ventilating device to form a U-shaped space drainage system; during the sludge hydraulic filling process and during the period after the hydraulic filling, the ventilation valve is adjusted to enable the drainage system to pump water under low vacuum, so that the smoothness of a drainage channel is ensured, the mud-water separation is promoted, and the concentration of sludge is greatly improved. The method adopts a vacuum extractor to generate negative pressure, and can promote the separation of mud and water. However, the method and the equipment adopted in the method can not deeply dehydrate the sludge, the treated sludge has high water content and poor engineering property, and compared with the sludge after deep dehydration, the sludge still occupies larger stacking area, has large engineering hidden danger, long cycle of repeated development and utilization and the like.
Therefore, how to provide a special sludge treatment reagent and a use method thereof, which can improve the sludge dewatering rate, reduce the residual moisture after sludge dewatering, and enable the dewatered sludge to have better engineering, is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a special reagent for sludge treatment and a using method thereof, which can improve the sludge dewatering rate, reduce the residual water content after sludge dewatering and ensure that the dewatered sludge has better engineering.
In order to solve the technical problems, the invention adopts the following technical scheme:
the special reagent for sludge treatment is characterized by comprising, by mass, 120-300 parts of cement, 250-500 parts of quick lime, 0.5-3.0 parts of aluminum powder, 3-6 parts of a water reducing agent, 5-10 parts of an accelerating agent and 0.02-0.1 part of a foam stabilizer.
In the technical scheme, the cement in the special reagent can reduce the hydrophilicity of the sludge, increase the hardness and brittleness of the sludge and improve the strength of the sludge; quicklime can reduce the hydrophilicity of the sludge, increase the hardness and brittleness of the sludge, improve the strength of the sludge, sterilize and reduce the pollution of the sludge; the aluminum powder can foam the sludge and generate a large amount of bubbles when the sludge is hardened to form a large amount of communicated pores to form rope end channels and increase the permeability of the sludge; the water reducing agent can increase the surface activity of the water in the sludge, so that the reagent is easier to mix with the sludge; the accelerator can accelerate the cement hardening speed, quickly solidify sludge and effectively shorten the sludge dewatering time. The added special reagent can enable a large number of pores to be generated in the sludge, and the sludge is quickly hardened, so that the brittleness and the hardness are increased, meanwhile, the hydrophilicity is weakened, and the hydrophobicity is enhanced.
The optimal mass ratio of the special reagent is 260 parts of cement, 420 parts of quicklime, 1.8 parts of aluminum powder, 5.6 parts of water reducing agent, 7.8 parts of accelerating agent and 0.08 part of foam stabilizer.
Thus, the special reagent with the optimal proportion can enable the components to exert the maximum effect, and the mutual influence among the components is smaller.
The invention also discloses a using method of the special reagent for sludge treatment, which is characterized in that sludge to be treated is obtained, the special reagent in the claim 1 or 2 is added into the sludge and is uniformly stirred, the reaction is completed, water is forcibly squeezed out of the sludge by adopting a dynamic compaction means, and the drained water is pumped away.
In the technical scheme, the sludge is modified by adding the special reagent, so that the hardness and brittleness of the sludge can be improved, and the sludge is foamed, so that a large number of pores are generated in the sludge, the sludge is quickly hardened, the hardness and brittleness are increased, the hydrophilicity is weakened, and the hydrophobicity is enhanced. The modified sludge is subjected to dynamic compaction to realize water squeezing and drainage, bubbles inside the sludge are broken during dynamic compaction to form a large number of transverse cracks and form a drainage channel in the horizontal direction, and meanwhile, great excess pore water pressure is formed inside the sludge, so that water inside the sludge flows to the inner side wall of the sludge treatment equipment. Thereby achieving the effects of rapid dehydration and deep dehydration.
As optimization, a, firstly, obtaining equipment which comprises a water permeable layer assembly, wherein the water permeable layer assembly surrounds a sludge placing space with an upward opening, a water accumulation space is arranged on the outer side of the circumference of the water permeable layer assembly, and the bottom surface of the water accumulation space is flush with the lowest part of the bottom surface of the sludge placing space; the water accumulation space is in conduction connection with an input port of a water pump in the suction device through a water inlet pipe, the dynamic compaction device is arranged outside the sludge placing space and comprises a dynamic compaction hammer arranged above the sludge placing space, and the dynamic compaction hammer can move downwards along the depth direction of the sludge placing space to perform dynamic compaction operation; b, sludge to be treated is placed in a sludge placing space of the equipment, the special reagent is added, and then the sludge and the special reagent are uniformly stirred; c, after the sludge and the special reagent are fully reacted, performing dynamic compaction operation on the sludge by using a dynamic compaction device, and extruding water into a water accumulation space on the periphery of the sludge treatment equipment and pumping out the water accumulation space; and d, transferring the sludge after the dehydration treatment from the sludge treatment equipment to the outside of the equipment, and then performing the next operation.
Therefore, the sludge treatment equipment is combined with the dynamic compaction device and the special reagent, and the effects of quickly discharging the moisture in the sludge and deeply dewatering the sludge can be achieved. The silt is firstly placed into the silt treatment equipment, at the moment, water inside the silt firstly passes through the coarse sand layer from top to bottom and then reaches the bottom surface of the foundation pit with the slope after passing through the gravel layer, and then the water enters the ponding space after sequentially passing through the geotextile layer, the drainage plate and the porous mortar layer from inside to the periphery and is discharged. And then deeply dehydrating the sludge, wherein the added special reagent can enable a large number of pores to be generated in the sludge, and the pores are quickly hardened, so that the brittleness and the hardness are increased, meanwhile, the hydrophilicity is weakened, and the hydrophobicity is enhanced. The silt is smashed when the physical and chemical properties of the silt are changed and the dynamic compaction operation can be facilitated, the bubble breakage inside the silt can form a large number of transverse cracks and form a drainage channel in the horizontal direction during the dynamic compaction, and meanwhile, the great excess pore water pressure is formed inside the silt, so that the moisture inside the silt flows to the inner side wall of the silt treatment equipment. Thereby achieving the effects of rapid dehydration and deep dehydration.
In the step a, the equipment further comprises a barrel-shaped foundation pit with an upward opening, the water permeable layer assembly comprises geotextile which is of a cylindrical structure and is vertically arranged in the foundation pit, and a porous mortar layer with water permeability is sleeved on the outer side of the geotextile; and a sludge placing space is enclosed between the bottom surface of the foundation pit and the inner side wall of the geotextile, and the water accumulation space is arranged at the outer side of the porous mortar layer.
Therefore, the whole permeable layer assembly is placed in the foundation pit, the original shape characteristics can be kept, and the original shape can be kept even under the action of external force. Geotechnological cloth has the characteristics that the reinforce is high, corrosion-resistant, the water permeability is strong, and the medial surface that adopts geotechnological cloth also can make the silt that geotechnological cloth and foundation ditch bottom surface enclose place the space and can have non-deformable with the contact of silt, can be corrosion-resistant for a long time in the earth and the aquatic of the pH valve of difference, can make whole equipment have longer life, can keep the advantage of good water permeability. The porous mortar layer is arranged on the outer side of the geotextile, so that the sludge placing space is not deformed, and the shape of the dynamic compaction hammer of the dynamic compaction device can be better matched.
As optimization, a gravel layer is arranged at the bottom of the sludge placing space, and a sand stone layer is further arranged above the gravel layer.
Therefore, sewage which is separated from the sludge flowing through the bottom of the foundation pit can flow into the accumulated water space through the filtration of the coarse sand layer and the gravel layer, and the quality of the discharged water can be improved. Secondly, when the dynamic compaction hammer of the dynamic compaction device carries out dynamic compaction on the sludge in the sludge placing space, the gravel layer and the gravel layer arranged on the bottom surface of the foundation pit can play a role in damping, and the foundation pit can be protected.
Preferably, the center of the bottom surface of the foundation pit is arched upwards, so that the whole bottom surface forms an inclined plane gradually rising from the periphery of the bottom surface to the center of the bottom surface.
Therefore, the sewage separated from the sludge is uniformly distributed to the periphery of the bottom surface of the foundation pit, and the sewage is convenient to discharge.
And as optimization, a drainage plate is arranged between the geotextile and the porous mortar layer.
Like this, still be provided with the drain bar between geotechnological cloth and porous mortar layer and can prevent that the earth particle from passing through to it is smooth and easy to avoid drainage channel to block messenger's pore drainage. But also can effectively derive the sewage that permeates through the geotechnical cloth layer in the silt fast.
Preferably, the opening position of the foundation pit is flush with the ground.
Like this, set up the foundation ditch in the below ground for the foundation ditch can bear bigger radial pressure and indeformable, can be favorable to keeping the shape in silt place space unchangeable under the dynamic compaction operating mode.
As optimization, an iron grid is arranged at an opening at the upper end of the water accumulation space. Like this, be favorable to the operation personnel to walk, inside the effectual debris that prevent fell into the ponding space.
And optimally, the foundation pit is formed by casting concrete.
Therefore, the construction and the manufacture are convenient, and the strength and the rigidity are high.
Drawings
Fig. 1 is a schematic structural view of a sludge treatment apparatus according to an embodiment of the present invention.
Fig. 2 is a top view of fig. 1 (the dynamic compaction device and the sedimentation basin are omitted in the figure).
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In the specific implementation: as shown in the figures 1 and 2, the special reagent for sludge treatment is characterized by comprising, by mass, 120-300 parts of cement, 250-500 parts of quick lime, 0.5-3.0 parts of aluminum powder, 3-6 parts of a water reducing agent, 5-10 parts of an accelerating agent and 0.02-0.1 part of a foam stabilizer.
In the technical scheme, the cement in the special reagent can reduce the hydrophilicity of the sludge, increase the hardness and brittleness of the sludge and improve the strength of the sludge; quicklime can reduce the hydrophilicity of the sludge, increase the hardness and brittleness of the sludge, improve the strength of the sludge, sterilize and reduce the pollution of the sludge; the aluminum powder can foam the sludge and generate a large amount of bubbles when the sludge is hardened to form a large amount of communicated pores to form rope end channels and increase the permeability of the sludge; the water reducing agent can increase the surface activity of the water in the sludge, so that the reagent is easier to mix with the sludge; the accelerator can accelerate the cement hardening speed, quickly solidify sludge and effectively shorten the sludge dewatering time. The added special reagent can enable a large number of pores to be generated in the sludge, and the sludge is quickly hardened, so that the brittleness and the hardness are increased, meanwhile, the hydrophilicity is weakened, and the hydrophobicity is enhanced.
In the specific embodiment, the optimal mass ratio of the special reagent is 260 parts of cement, 420 parts of quicklime, 1.8 parts of aluminum powder, 5.6 parts of water reducing agent, 7.8 parts of accelerating agent and 0.08 part of foam stabilizer.
Thus, the special reagent with the optimal proportion can enable the components to exert the maximum effect, and the mutual influence among the components is smaller.
The invention also discloses a using method of the special reagent for sludge treatment, which is characterized in that sludge to be treated is obtained, the special reagent in the claim 1 or 2 is added into the sludge and is uniformly stirred, the reaction is completed, water is forcibly squeezed out of the sludge by adopting a dynamic compaction means, and the drained water is pumped away.
In the technical scheme, the sludge is modified by adding the special reagent, so that the hardness and brittleness of the sludge can be improved, and the sludge is foamed, so that a large number of pores are generated in the sludge, the sludge is quickly hardened, the hardness and brittleness are increased, the hydrophilicity is weakened, and the hydrophobicity is enhanced. The modified sludge is subjected to dynamic compaction to realize water squeezing and drainage, bubbles inside the sludge are broken during dynamic compaction to form a large number of transverse cracks and form a drainage channel in the horizontal direction, and meanwhile, great excess pore water pressure is formed inside the sludge, so that water inside the sludge flows to the inner side wall of the sludge treatment equipment. Thereby achieving the effects of rapid dehydration and deep dehydration.
In the specific embodiment, a, firstly, obtaining equipment which comprises a water permeable layer assembly 1, wherein the water permeable layer assembly 1 encloses a sludge placing space with an upward opening, a water accumulation space is arranged on the outer side of the circumferential direction of the water permeable layer assembly 1, and the bottom surface of the water accumulation space is flush with the lowest part of the bottom surface of the sludge placing space; the ponding space is in conduction connection with an input port of a water pump 21 in the suction device 2 through a water inlet pipe 22, the dynamic compaction device 3 is arranged outside the sludge placing space, the dynamic compaction device 3 comprises a dynamic compaction hammer 31 arranged above the sludge placing space, and the dynamic compaction hammer 31 can move downwards along the depth direction of the sludge placing space to perform dynamic compaction operation; b, sludge to be treated is placed in a sludge placing space of the equipment, the special reagent is added, and then the sludge and the special reagent are uniformly stirred; c, after the sludge and the special reagent are fully reacted, performing dynamic compaction operation on the sludge by using a dynamic compaction device, and extruding water into a water accumulation space on the periphery of the sludge treatment equipment and pumping out the water accumulation space; and d, transferring the sludge after the dehydration treatment from the sludge treatment equipment to the outside of the equipment, and then performing the next operation.
Therefore, the sludge treatment equipment is combined with the dynamic compaction device and the special reagent, and the effects of quickly discharging the moisture in the sludge and deeply dewatering the sludge can be achieved. The silt is firstly placed into the silt treatment equipment, at the moment, water inside the silt firstly passes through the coarse sand layer from top to bottom and then reaches the bottom surface of the foundation pit with the slope after passing through the gravel layer, and then the water enters the ponding space after sequentially passing through the geotextile layer, the drainage plate and the porous mortar layer from inside to the periphery and is discharged. And then deeply dehydrating the sludge, wherein the added special reagent can enable a large number of pores to be generated in the sludge, and the pores are quickly hardened, so that the brittleness and the hardness are increased, meanwhile, the hydrophilicity is weakened, and the hydrophobicity is enhanced. The silt is smashed when the physical and chemical properties of the silt are changed and the dynamic compaction operation can be facilitated, the bubble breakage inside the silt can form a large number of transverse cracks and form a drainage channel in the horizontal direction during the dynamic compaction, and meanwhile, the great excess pore water pressure is formed inside the silt, so that the moisture inside the silt flows to the inner side wall of the silt treatment equipment. Thereby achieving the effects of rapid dehydration and deep dehydration.
In the specific embodiment, in the step a, the equipment further comprises a barrel-shaped foundation pit 4 with an upward opening, the water permeable layer assembly 1 comprises a geotextile 11 which is in a cylindrical structure and is vertically arranged in the foundation pit 4, and a porous mortar layer 12 with water permeability is sleeved on the outer side of the geotextile 11; a sludge placing space is enclosed between the bottom surface of the foundation pit 4 and the inner side wall of the geotextile 11, and the water accumulation space is arranged outside the porous mortar layer 12.
Therefore, the whole permeable layer assembly is placed in the foundation pit, the original shape characteristics can be kept, and the original shape can be kept even under the action of external force. Geotechnological cloth has the characteristics that the reinforce is high, corrosion-resistant, the water permeability is strong, and the medial surface that adopts geotechnological cloth also can make the silt that geotechnological cloth and foundation ditch bottom surface enclose place the space and can have non-deformable with the contact of silt, can be corrosion-resistant for a long time in the earth and the aquatic of the pH valve of difference, can make whole equipment have longer life, can keep the advantage of good water permeability. The porous mortar layer is arranged on the outer side of the geotextile, so that the sludge placing space is not deformed, and the shape of the dynamic compaction hammer of the dynamic compaction device can be better matched.
In this embodiment, a gravel layer 5 is provided at the bottom of the sludge placing space, and a gravel layer 6 is further provided above the gravel layer 5.
Therefore, sewage which is separated from the sludge flowing through the bottom of the foundation pit can flow into the accumulated water space through the filtration of the coarse sand layer and the gravel layer, and the quality of the discharged water can be improved. Secondly, when the dynamic compaction hammer of the dynamic compaction device carries out dynamic compaction on the sludge in the sludge placing space, the gravel layer and the gravel layer arranged on the bottom surface of the foundation pit can play a role in damping, and the foundation pit can be protected.
In this embodiment, the center of the bottom surface of the foundation pit 4 is arched upward so that the entire bottom surface forms an inclined surface gradually rising from the periphery of the bottom surface to the center of the bottom surface.
Therefore, the sewage separated from the sludge is uniformly distributed to the periphery of the bottom surface of the foundation pit, and the sewage is convenient to discharge.
Wherein, the slope of the inclined plane that the bottom surface of foundation ditch 4 formed is between two percent to four percent.
Therefore, the coarse sand layer and the gravel layer which are positioned above the bottom surface of the foundation pit are not easy to move around the bottom surface under the action of the dynamic compaction pressure while the sewage in the sludge flows around the bottom surface.
In this embodiment, a drainage plate 13 is further disposed between the geotextile 11 and the porous mortar layer 12.
Like this, still be provided with the drain bar between geotechnological cloth and porous mortar layer and can prevent that the earth particle from passing through to it is smooth and easy to avoid drainage channel to block messenger's pore drainage. But also can effectively derive the sewage that permeates through the geotechnical cloth layer in the silt fast.
In this embodiment, the opening of the foundation pit 4 is flush with the ground.
Like this, set up the foundation ditch in the below ground for the foundation ditch can bear bigger radial pressure and indeformable, can be favorable to keeping the shape in silt place space unchangeable under the dynamic compaction operating mode.
In this specific embodiment, be provided with iron grid 7 at the upper end opening part in ponding space. Like this, be favorable to the operation personnel to walk, inside the effectual debris that prevent fell into the ponding space. Certainly when concrete implementation, can be connected with the connecting plate between the upper end opening part of foundation ditch and the upper end opening part that is tubular structure's geotechnological cloth, place pending silt back in the space is placed to silt, can make the ponding space form a closed cavity, can carry out the evacuation to the ponding space under suction device's effect, can not form the negative pressure in the ponding space after the evacuation, the atmospheric pressure of effect on silt can make silt dehydration rate accelerate this moment, belong to the scope that this device can implement equally.
In this embodiment, the foundation pit 4 is formed by casting concrete.
Therefore, the construction and the manufacture are convenient, and the strength and the rigidity are high.
In this specific embodiment, suction device 2 still include with the inlet tube 22 that the entrance point of water pump 21 links to each other, the other end of inlet tube 22 stretches into the bottom in ponding space, and the exit end of water pump 21 is connected with outlet pipe 23, the other end of outlet pipe 23 and the sedimentation tank 8 intercommunication that is located water pump 21 one side. Like this, the water pump can be taken the inside sewage in ponding space out to the sedimentation tank for the hydrologic cycle behind the silt dehydration is unblocked, can be favorable to the silt dehydration.
Claims (7)
1. The special reagent for sludge treatment is characterized by comprising 260 parts of cement, 420 parts of quicklime, 1.8 parts of aluminum powder, 5.6 parts of a water reducing agent, 7.8 parts of an accelerating agent and 0.08 part of a foam stabilizer.
2. The using method of the special reagent for sludge treatment is characterized in that a, firstly, equipment is obtained, the equipment comprises a water permeable layer assembly (1), the water permeable layer assembly (1) is surrounded to form a sludge placing space with an upward opening, a water accumulation space is arranged on the outer side of the circumferential direction of the water permeable layer assembly (1), and the bottom surface of the water accumulation space is flush with the lowest position of the bottom surface of the sludge placing space; the water accumulation space is in conduction connection with an input port of a water pump (21) in the suction device (2) through a water inlet pipe (22), the dynamic compaction device (3) is arranged on the outer side of the sludge placing space, the dynamic compaction device (3) comprises a dynamic compaction hammer (31) arranged above the sludge placing space, and the dynamic compaction hammer (31) can move downwards along the depth direction of the sludge placing space to perform dynamic compaction operation; the equipment further comprises a barrel-shaped foundation pit (4) with an upward opening, the water permeable layer assembly (1) comprises a geotextile (11) which is of a cylindrical structure and is vertically arranged in the foundation pit (4), and a porous mortar layer (12) with water permeability is sleeved on the outer side of the geotextile (11); a sludge placing space is enclosed between the bottom surface of the foundation pit (4) and the inner side wall of the geotextile (11), and the water accumulation space is arranged at the outer side of the porous mortar layer (12); b, putting the sludge to be treated into a sludge placing space of the equipment, adding the special reagent as described in claim 1, and uniformly stirring the sludge and the special reagent; c, after the sludge and the special reagent are fully reacted, performing dynamic compaction operation on the sludge by using a dynamic compaction device, and extruding water into a water accumulation space on the periphery of the sludge treatment equipment and pumping out the water accumulation space; and d, transferring the sludge after the dehydration treatment from the sludge treatment equipment to the outside of the equipment, and then performing the next operation.
3. The method for using the special reagent for sludge treatment as claimed in claim 2, wherein a gravel layer (5) is arranged at the bottom of the sludge placing space, and a sand stone layer (6) is arranged above the gravel layer (5).
4. The method for using the special reagent for sludge treatment as claimed in claim 2, wherein the center of the bottom surface of the foundation pit (4) is arched upwards so that the whole bottom surface forms an inclined surface gradually rising from the periphery of the bottom surface to the center of the bottom surface.
5. The method for using the special reagent for sludge treatment as claimed in claim 2, wherein the opening position of the foundation pit (4) is flush with the ground.
6. The use method of the special reagent for sludge treatment as claimed in claim 2, characterized in that an iron grid (7) is arranged at the opening of the upper end of the water accumulation space.
7. The use method of the special sludge treatment agent as claimed in claim 2, wherein the foundation pit (4) is formed by concrete casting.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102733349A (en) * | 2011-04-15 | 2012-10-17 | 浙江科技学院 | Method for de-silting lake and constructing lake center island |
| CN103058491A (en) * | 2013-01-10 | 2013-04-24 | 温州大学 | Composite filter-pressing centrifugal dehydrant |
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2017
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102733349A (en) * | 2011-04-15 | 2012-10-17 | 浙江科技学院 | Method for de-silting lake and constructing lake center island |
| CN103058491A (en) * | 2013-01-10 | 2013-04-24 | 温州大学 | Composite filter-pressing centrifugal dehydrant |
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