CN111138065B - Sludge dewatering pretreatment device and pretreatment concentration method thereof - Google Patents
Sludge dewatering pretreatment device and pretreatment concentration method thereof Download PDFInfo
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- CN111138065B CN111138065B CN202010144420.2A CN202010144420A CN111138065B CN 111138065 B CN111138065 B CN 111138065B CN 202010144420 A CN202010144420 A CN 202010144420A CN 111138065 B CN111138065 B CN 111138065B
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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
- C02F11/126—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using drum filters
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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
- C02F2303/14—Maintenance of water treatment installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention discloses a sludge dewatering pretreatment device, which comprises a sludge conditioning device and a rotary drum concentrating and dewatering device, wherein the rotary drum concentrating and dewatering device comprises a shell, a screen drum is vertically and rotatably arranged in the shell, one end of the screen drum is open and obliquely downwards forms a sludge outlet end, a sludge inlet pipe is arranged in the middle of the screen drum and used for feeding sludge, the outlet end of the sludge inlet pipe is used for discharging sludge, the screen drum is connected with a power device and can be driven to rotate by the power device, and the bottom of an inner cavity of the shell is provided with a water outlet positioned at the lowest position; the mud outlet device is characterized in that the outlet end of the mud inlet pipe is also connected with a frustum-shaped mud outlet conical cylinder, the whole mud outlet conical cylinder is horizontally arranged, the small-diameter end is connected with the outlet end of the mud inlet pipe, and the large-diameter end face is arranged at the bottom of the inner end of the screen cylinder. Also discloses a sludge dewatering pretreatment concentration method based on the device. The invention has the advantages of better improving the sludge dewatering effect and reducing the water content of the sludge.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sludge dewatering pretreatment device and a pretreatment concentration method thereof.
Background
The sewage (waste water) discharged from a pollution source cannot meet the requirement of discharge standard or cannot meet the requirement of environmental capacity due to high total pollutant content or concentration, so that when the quality and the function of the water environment are reduced, the sewage (waste water) needs to be artificially and intensively treated, and the site is a sewage treatment plant which is also called a sewage treatment station. In the current society, urban domestic sewage needs to be conveyed to a sewage treatment plant in a centralized manner and then discharged or recycled after being treated by sewage. In the sewage treatment process, a large amount of sludge is generated by precipitation in the sewage treatment process of each procedure such as a primary sedimentation tank, a secondary sedimentation tank and the like, and the sewage needs to be cleaned regularly.
After the sludge in the sewage treatment plant is taken out, the moisture content of the sludge needs to be further reduced by a physical method for facilitating the transportation, accumulation, utilization or further treatment of the sludge. According to the discharge standard of pollutants for municipal wastewater treatment plants, the water content of the dewatered sludge needs to be less than 80 percent.
At present, the sludge dewatering is generally carried out by a mechanical dewatering machine at home. In actual operation, the sludge belt type dehydrator is widely applied to sludge treatment of a sewage treatment plant, the water content of sludge can stably reach below 80% under the condition of sludge discharge load within 10% of the dehydrator, but the sludge discharge amount is low, and the normal sludge discharge requirement of the sewage treatment plant cannot be met. The belt type sludge dehydrator works under the condition of normal sludge discharge load, the water content of the treated sludge basically cannot reach below 80 percent, the trend that the load is larger and the water content of the sludge is higher is shown, the belt type sludge dehydrator is not beneficial to effectively controlling the sludge discharge amount of a sewage treatment plant, and meanwhile, the belt type sludge dehydrator is not beneficial to sludge reduction and sludge deep treatment.
At present, a belt type dehydrator called a belt type filter press is adopted for mechanical dehydration, and the belt type dehydrator is a continuously-operated solid-liquid separation device. During dehydration, the sludge enters two filter cloths of a filter press to be compressed, and sequentially enters three stages of gravity dehydration, low-pressure dehydration and high-pressure dehydration to finally form a mud cake. Meanwhile, the sludge needs to be subjected to dehydration pretreatment before entering the filter cloth.
The dehydration pretreatment needs to add treatment additives such as flocculating agent and the like into the sludge, and then uniformly stir the sludge to modify and condition the sludge. Then the conditioned sludge is primarily dehydrated by adopting a rotating strand concentration dehydration device.
Present rotary drum concentration dewatering device, including the horizontal casing of fixing the setting, but the casing is inside to be provided with wholly along transverse arrangement's a sieve section of thick bamboo vertically to rotate, the uncovered setting of one end of a sieve section of thick bamboo and this end slant down dip form out the mud end, the play mud end middle part of a sieve section of thick bamboo is provided with the mud pipe that advances to the extension in a sieve section of thick bamboo, it is fixed and external for advancing mud to advance the mud pipe outer end for the casing, the exit end that advances the mud pipe extends and is used for out mud to sieve section of thick bamboo inner bottom, a sieve section of thick bamboo and power device link to each other and can lean on power device to drive rotatoryly, casing inner chamber bottom has a delivery port that is located the lowest. When the device is used, the flocculated and conditioned sludge enters the bottom of the inner end of the screen drum through the sludge inlet pipe, and the screen drum is driven to rotate by the power device, so that centrifugal gravity pre-dewatering of the sludge is realized. The sludge after the preliminary dehydration flows out from the feeding direction of the screen drum, namely the sludge outlet end, and then enters the pressing section of the filter press for dehydration. In addition, in order to maintain the centrifugal filtering and dewatering effect of the screen drum, the device is also provided with a back washing structure, the back washing structure comprises a row of nozzles which are axially arranged outside the screen drum, the water outlet direction of the nozzles is arranged opposite to the screen drum, and the filter screen of the rotating screen drum is reversely washed by the continuously supplied high-pressure water so as to maintain the filtering effect.
However, the conventional drum thickening and dewatering device has the following drawbacks when performing dewatering pretreatment of sludge. 1 mud is comparatively concentrated after getting into a sieve section of thick bamboo bottom through advancing the mud pipe, need pass through one section distance in a sieve section of thick bamboo, just can break up for being more dispersed state by a sieve section of thick bamboo, just can rely on the rotation of a sieve section of thick bamboo to carry out centrifugal dehydration better after the dispersion, so influenced dehydration efficiency and effect. 2 if the back washing water has small impact force, the screen drum cannot be well washed, and the washing effect is not good, so that the screen mesh is blocked by floccules in the sludge, so that the dehydration effect is reduced; and through the increase of backwash water impulsive force, then lead to backwash water backwash to enter into inside the sieve section of thick bamboo easily, in the last preliminary treatment mud after having added centrifugal dehydration again of backwash water like this, cause the concentrated effect of mud preliminary treatment not good, and then cause the mud of follow-up entering pressure filter because of the moisture content is high, the mud phenomenon appears running, influences follow-up squeezer mud moisture content and mud output simultaneously. Therefore, the pressure of the backwashing water is controlled to have the contradiction, the backwashing water is required to be accurately controlled not to be small enough to just open the mesh blockage, and meanwhile, the uncertainty of factors such as components in the sludge, the proportion of floccules and the like is large, so that the backwashing water is difficult to accurately calculate and control to confirm the size of the backwashing water so as to better ensure the dewatering effect.
Therefore, if the dewatering effect during sludge pretreatment is further improved, the reduction of the water content of the final sludge and the improvement of the sludge yield are ensured, and the problems to be considered and solved by the technical personnel in the field are solved.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: provided are a sludge dewatering pretreatment device and a pretreatment concentration method thereof, which can improve the sludge dewatering effect and reduce the sludge water content.
In order to solve the technical problems, the invention adopts the following technical scheme:
a sludge dewatering pretreatment device comprises a sludge conditioning device and a rotary drum concentrating and dewatering device, wherein the rotary drum concentrating and dewatering device comprises a shell which is horizontally and transversely fixedly arranged, a screen drum which is integrally and transversely arranged is vertically and rotatably arranged in the shell, one end of the screen drum is open and obliquely inclines downwards to form a sludge outlet end, a sludge inlet pipe which extends into the screen drum is arranged in the middle of the sludge outlet end of the screen drum, the outer end of the sludge inlet pipe is fixed relative to the shell and is externally connected with the sludge conditioning device for feeding sludge, the outlet end of the sludge inlet pipe extends towards the bottom of the inner end of the screen drum for discharging sludge, the screen drum is connected with a power device and can be driven to rotate by the power device, and the bottom of an inner cavity of the shell is provided with a water outlet which is positioned at the lowest position; the mud outlet device is characterized in that the outlet end of the mud inlet pipe is also connected with a frustum-shaped mud outlet conical cylinder, the whole mud outlet conical cylinder is horizontally arranged, the small-diameter end is connected with the outlet end of the mud inlet pipe, and the large-diameter end face is arranged at the bottom of the inner end of the screen cylinder.
Like this, advance in mud pipe goes out mud and falls into a sieve section of thick bamboo through the play mud awl section of thick bamboo of frustum shape again, mud can break up evenly better through a play mud awl section of thick bamboo, makes it fall into can be more high-efficiently dispersed after a sieve section of thick bamboo to realize centrifugal dehydration better, improve dehydration efficiency.
Furthermore, the sludge conditioning device comprises a conditioning and stirring container, wherein the conditioning and stirring device is arranged in the conditioning and stirring container, and the conditioning and stirring container is connected with a sludge storage container through a sludge feeding pipeline and is connected with a flocculant adding container through a flocculant feeding pipeline.
Therefore, the sludge and the flocculating agent can be better controlled to respectively enter the conditioning and stirring container according to the required amount to be uniformly stirred, and the conditioning, modification and prefabrication treatment of the sludge can be better controlled and realized. The sludge conditioning treatment in place can better ensure the subsequent dehydration effect.
Furthermore, a sludge pump gate is arranged on the sludge feeding pipeline, and a quantitative pump gate is arranged on the flocculant feeding pipe. In this way, a better control of the feed can be achieved.
Furthermore, stirring devices are arranged in the sludge storage container and the flocculating agent adding container. This avoids the formation of sediment in the vessel and also facilitates the preparation of the flocculant solution.
Furthermore, the screen drum comprises a frame body which is cylindrical as a whole and a filter material covered outside the frame body, and the filter material is made of a flexible woven material.
Therefore, the preparation and installation of the screen cylinder are convenient, the structure is simple, the cost is low, and the filtering and dewatering effect is excellent.
Furthermore, the filter material is a cloth-shaped material woven by polyurethane material or metal wires.
Thus, the mature existing product can be purchased for preparation, and the filtering effect is good.
Furthermore, the drum concentrating and dehydrating device also comprises a back washing structure, wherein the back washing structure comprises a row of nozzles which are axially arranged outside the screen drum, and the water outlet direction of the nozzles is arranged over against the screen drum.
Thus, the rotary screen drum filter screen can be backwashed by continuously supplied high-pressure water, so that floccules in sludge are prevented from blocking meshes of the screen drum, and the filtering effect is better maintained.
Further, the nozzle is arranged at the upper position of the screen drum.
Therefore, the screen drum is arranged at the lower position relative to the nozzle, and can better wash away the filtering meshes of the screen drum by means of the gravity of washing water, thereby improving the back washing effect.
Furthermore, the nozzle is arranged on a cleaning water pipe which is integrally arranged along the axial direction of the screen cylinder.
Thus, the structure is simple, and the nozzle is more convenient to install.
Further, a washing water pipe is fixed to the housing and has one end connected to the outside of the housing and connected to a washing water source through a pressurizing pump.
Therefore, the water pressure of the outlet water can be more conveniently controlled to achieve the sufficient back washing effect.
Further, the setting density of the nozzles is gradually increased along the mud outlet end direction of the screen drum.
This is because as the sludge is gradually dispersed in the screen drum, the filter mesh closer to the sludge outlet end of the screen drum is more easily blocked by sludge flocs, so that the backwash effect can be better improved by gradually increasing the nozzle arrangement density in the sludge outlet direction.
Furthermore, a back washing water receiving component is arranged in the inner cavity of the screen cylinder, the back washing water receiving component is integrally arranged in a long strip shape along the axial direction of the screen cylinder and is integrally positioned in the direction close to the nozzle, a water receiving groove is formed in the back washing water receiving component in the water outlet direction of the nozzle, one end of the back washing water receiving component is integrally arranged in a downward inclined mode to form a water outlet end, and the water outlet end is connected to the outside of the shell through a water outlet pipeline.
Like this, when relying on the nozzle to carry out the back flush, can heighten the water pressure for the back flush water passes the filter media and sprays and enter into and strain an inside of section of thick bamboo, and then makes the back flush can be thorough, all washes away the floccule of jam in the filter media mesh, and then greatly improves the centrifugal dehydration effect of straining a section of thick bamboo. Meanwhile, after the backwashing water penetrates into the filter cartridge, the backwashing water sprayed into the filter cartridge can be received by the water receiving tank and then is discharged out of the shell through the water outlet pipeline. Therefore, the washing effect of the back washing is ensured to improve the centrifugal dehydration effect of the screen drum, and the phenomenon that excessive water enters the screen drum to improve the water content of the treated sludge due to the fact that the back washing effect is improved is avoided. The water outlet pressure of the nozzle does not need to be accurately calculated and controlled, and only the water outlet pressure is ensured to enable the backwashing water to pass through the screen drum filter material in the treatment process. Therefore, the technical problem that the pressure of the backwash water in the industry is difficult to accurately adjust and control is solved by adopting a simple structure and low cost.
The device is characterized in that during backwashing, the pressure of backwashing water is controlled to be increased so that the backwashing water flushes filter meshes on the filter cylinder and is injected into the filter cylinder, and a backwashing water receiving component is arranged in the filter cylinder to receive the injected backwashing water and lead the backwashing water out of the shell. Therefore, the technical problem that the pressure of the backwashing water in the industry is difficult to accurately adjust and control is solved by adopting a simple means, and the dewatering effect of the sludge dewatering pretreatment is ensured.
Further, the nozzle is located at a position which is offset from the rotation direction of the screen drum by a certain angle in the middle of the top of the screen drum.
Be located directly over the sieve section of thick bamboo top for the nozzle like this, perhaps skew sieve section of thick bamboo rotates opposite direction and sets up, can avoid the backwash water to rush into the water receiving tank with too much mud together better.
Furthermore, the backwashing water receiving component shifts forwards for a certain distance along the rotating direction of the screen drum during working, so that the water receiving tank faces the water outlet direction of the nozzle obliquely.
So because the screen drum self rotation can lead to passing the backwash water of screen drum and produce the effect of certain whipping forward when the work of a screen drum, so this structural arrangement makes the water receiving tank catch the backwash water that gets into in the screen drum better.
Furthermore, the back washing water receiving component is fixedly supported on the mud inlet pipe through a support rod.
Therefore, the supporting installation of the backwashing water receiving component is realized by adopting a simple structure.
Furthermore, the opening direction of the water receiving tank of the back washing water receiving component is obliquely arranged, the upper half part is made of hard materials, and the lower half part is made of elastic sheets.
Therefore, after the lower half part of the water receiving tank is accumulated with sludge sediment, the lower half part can be bent by the gravity of the sludge sediment and the sludge sediment in the lower half part can slide out of the water receiving tank; thereby ensuring the long-term use of the back washing water receiving component and avoiding the difficulty in normal water receiving and diversion caused by sludge accumulation. Meanwhile, the upper half part is made of hard materials, so that the fixed supporting rod can be conveniently connected, and the hardness of the hard materials is enough to ensure that the supporting rod can be fixedly connected and can normally work without deformation.
Preferably, the water outlet end of the back washing water receiving component is positioned at the bottom of the screen cylinder, a water outlet pipeline connected with the water outlet end of the back washing water receiving component penetrates through the middle part of the bottom end of the screen cylinder and the middle part of the bottom end of the shell, the middle part of the bottom end of the screen cylinder is provided with an outward extending cylinder, a bearing is arranged between the extending cylinder and the water outlet pipeline, the extending cylinder and the shell are rotatably arranged, a fixed driving wheel is fixedly arranged at the outer end part of the extending cylinder, which exceeds the shell, and the fixed driving wheel is in transmission connection with a motor (the transmission connection can be in a gear connection or belt connection mode) and drives the screen cylinder to rotate.
Like this, under the driven prerequisite of not influencing a sieve section of thick bamboo, conveniently draw the outlet conduit out the casing, avoid a sieve section of thick bamboo to go out the mud end because will set up into mud pipeline and the space is not enough, the inconvenient defect that sets up outlet conduit. By adopting the structure, the mud inlet conical cylinder at the outlet end of the mud inlet pipe can be directly installed and fixed on the mud inlet pipeline.
As another preferred mode, the water outlet end of the back washing water receiving component is located at the mud outlet end of the screen drum and extends out of the shell, the back washing water receiving component is connected out through a vertically arranged water outlet pipeline, and the middle part of the outer side of the bottom end of the screen drum is provided with a rotating shaft and is connected with the motor.
Therefore, the water outlet pipeline of the back-washing water receiving component has a simple structure and is convenient for the connection of the screen cylinder and the motor. Adopt this kind of structure simultaneously, the awl section of thick bamboo of advancing of mud pipe exit end can be for a sieve section of thick bamboo fixed mounting for the during operation advances a mud awl section of thick bamboo and keeps rotatory for advancing the mud pipeline, and it is better to enter into the mud pipe and enter into a sieve section of thick bamboo after scattering into mud dispersion again, makes mud can disperse evenly better in a sieve section of thick bamboo sooner, improves its rotatory centrifugal dehydration effect.
Furthermore, the lower part of the mud outlet end of the screen drum is connected with a mud outlet shuttle groove. So that the mud can be discharged conveniently.
In conclusion, the invention has the advantages of better improving the sludge dewatering effect and reducing the water content of the sludge.
Drawings
Fig. 1 is a schematic structural view of a sludge dewatering pretreatment apparatus according to a first preferred embodiment of the present invention.
Fig. 2 is a view a-a of fig. 1.
Fig. 3 is a sectional view of the single backwash water receiving member of fig. 2.
Fig. 4 is a schematic structural view of a sludge dewatering pretreatment apparatus according to a second preferred embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
First preferred embodiment, see fig. 1-3:
a sludge dewatering pretreatment device comprises a sludge conditioning device and a rotary drum concentrating and dewatering device, wherein the rotary drum concentrating and dewatering device comprises a shell 1 which is horizontally and transversely fixedly arranged, a screen drum 2 which is integrally and transversely arranged is vertically and rotatably arranged in the shell 1, one end of the screen drum 2 is open and obliquely inclined downwards to form a sludge outlet end 3, a sludge inlet pipe 4 which extends into the screen drum is arranged in the middle of the sludge outlet end 3 of the screen drum 2, the outer end of the sludge inlet pipe 4 is fixed relative to the shell and is externally connected with the sludge conditioning device for feeding sludge, the outlet end of the sludge inlet pipe 4 extends towards the bottom of the inner end of the screen drum 2 and is used for discharging sludge, the screen drum 2 is connected with a power device and can be driven to rotate by the power device, and the bottom of an inner cavity of the shell 1 is provided with a water outlet 5 which is positioned at the lowest position; wherein, the exit end of advancing mud pipe 4 still links up and is provided with the play mud awl section of thick bamboo 6 of a frustum shape, goes out mud awl section of thick bamboo 6 and wholly is the level setting and minor diameter end and advances mud pipe 4 exit end and link up, and major diameter terminal surface sets up to the inner bottom of sieve section of thick bamboo 2.
Like this, advance in mud pipe goes out mud and falls into a sieve section of thick bamboo through the play mud awl section of thick bamboo of frustum shape again, mud can break up evenly better through a play mud awl section of thick bamboo, makes it fall into can be more high-efficiently dispersed after a sieve section of thick bamboo to realize centrifugal dehydration better, improve dehydration efficiency.
The sludge conditioning device comprises a conditioning and stirring container 7, the conditioning and stirring device is arranged in the conditioning and stirring container 7, the conditioning and stirring container 7 is connected with a sludge storage container 9 through a sludge feeding pipeline 8, and is connected with a flocculating agent adding container 11 through a flocculating agent feeding pipeline 10.
Therefore, the sludge and the flocculating agent can be better controlled to respectively enter the conditioning and stirring container according to the required amount to be uniformly stirred, and the conditioning, modification and prefabrication treatment of the sludge can be better controlled and realized. The sludge conditioning treatment in place can better ensure the subsequent dehydration effect.
Wherein, be provided with mud pump floodgate on the mud charge-in pipeline 8, be provided with quantitative pump floodgate on the flocculating agent inlet pipe 10. In this way, a better control of the feed can be achieved.
Wherein, stirring devices are arranged in the sludge storage container 9 and the flocculating agent adding container 11. This avoids the formation of sediment in the vessel and also facilitates the preparation of the flocculant solution.
The screen cylinder 2 includes a cylindrical frame body and a filter material (not shown) covered outside the frame body, and the filter material is made of a flexible woven material.
Therefore, the preparation and installation of the screen cylinder are convenient, the structure is simple, the cost is low, and the filtering and dewatering effect is excellent.
The filter material is a cloth-shaped material woven by polyurethane materials or metal wires.
Thus, the mature existing product can be purchased for preparation, and the filtering effect is good.
The drum concentrating and dehydrating device further comprises a back washing structure, the back washing structure comprises a row of nozzles 12 which are axially arranged outside the screen drum, and the water outlet direction of the nozzles 12 is arranged opposite to the screen drum.
Thus, the rotary screen drum filter screen can be backwashed by continuously supplied high-pressure water, so that floccules in sludge are prevented from blocking meshes of the screen drum, and the filtering effect is better maintained.
Wherein, the nozzle 12 is arranged at the upper position of the screen cylinder 1.
Therefore, the screen drum is arranged at the lower position relative to the nozzle, and can better wash away the filtering meshes of the screen drum by means of the gravity of washing water, thereby improving the back washing effect.
Wherein, the nozzle 12 is arranged on a cleaning water pipe 13 which is integrally arranged along the axial direction of the screen cylinder.
Thus, the structure is simple, and the nozzle is more convenient to install.
Wherein, the cleaning water pipe 13 is fixed to the housing and has one end connected to the outside of the housing and connected to a flushing water source through a pressurizing pump.
Therefore, the water pressure of the outlet water can be more conveniently controlled to achieve the sufficient back washing effect.
Wherein, the density of the nozzle 12 is gradually increased along the mud outlet end direction of the screen drum 2.
This is because as the sludge is gradually broken up in the screen drum, the filter mesh closer to the sludge outlet end of the screen drum is more easily clogged by sludge flocs, so that the backwash effect can be improved more effectively by gradually increasing the nozzle arrangement density in the sludge outlet direction.
Wherein, the inner cavity of the screen cylinder 2 is also provided with a back washing water receiving component 14, the back washing water receiving component 14 is integrally arranged along the axial direction of the screen cylinder and is integrally positioned in the direction close to the nozzle, a water receiving groove is formed on the back washing water receiving component 14 in the water outlet direction opposite to the nozzle, one end of the back washing water receiving component 14 is integrally arranged in a downward inclined way to form a water outlet end, and the water outlet end is connected to the outside of the shell through a water outlet pipeline.
Like this, when relying on the nozzle to carry out the back flush, can heighten the water pressure for the back flush water passes the filter media and sprays and enter into and strain an inside of section of thick bamboo, and then makes the back flush can be thorough, all washes away the floccule of jam in the filter media mesh, and then greatly improves the centrifugal dehydration effect of straining a section of thick bamboo. Meanwhile, after the backwashing water penetrates into the filter cartridge, the backwashing water sprayed into the filter cartridge can be received by the water receiving tank and then is discharged out of the shell through the water outlet pipeline. Therefore, the washing effect of the back washing is ensured to improve the centrifugal dehydration effect of the screen drum, and the phenomenon that excessive water enters the screen drum to improve the water content of the treated sludge due to the fact that the back washing effect is improved is avoided. The water outlet pressure of the nozzle does not need to be accurately calculated and controlled, and only the water outlet pressure is ensured to enable the backwashing water to pass through the screen drum filter material in the treatment process. Therefore, the technical problem that the pressure of the backwash water in the industry is difficult to accurately adjust and control is solved by adopting a simple means and low cost.
Wherein, the nozzle 12 is positioned at a position which is offset from the rotation direction of the screen drum at the center of the top of the screen drum 2 by a certain angle.
Be located directly over the sieve section of thick bamboo top for the nozzle like this, perhaps skew sieve section of thick bamboo rotates opposite direction and sets up, can avoid the backwash water to rush into the water receiving tank with too much mud together better.
Wherein, the back washing water receiving component 14 shifts forward along the rotation direction of the screen drum 2 for a certain distance, so that the water receiving tank faces the water outlet direction of the nozzle obliquely.
So because the screen drum self rotation can lead to passing the backwash water of screen drum and produce the effect of certain whipping forward when the work of a screen drum, so this structural arrangement makes the water receiving tank catch the backwash water that gets into in the screen drum better.
Wherein, the back washing water receiving component 14 is fixedly supported on the mud inlet pipe 4 through a support rod 15.
Therefore, the supporting installation of the backwashing water receiving component is realized by adopting a simple structure.
Wherein, the opening direction of the water receiving tank of the back washing water receiving component 14 is obliquely arranged, the upper half part adopts hard material, and the lower half part is made of elastic sheet material (see fig. 4).
Therefore, after the lower half part of the water receiving tank is accumulated with sludge sediment, the lower half part can be bent by the gravity of the sludge sediment and the sludge sediment in the lower half part can slide out of the water receiving tank; thereby ensuring the long-term use of the back washing water receiving component and avoiding the difficulty in normal water receiving and diversion caused by sludge accumulation. Meanwhile, the upper half part is made of hard materials, so that the fixed supporting rods can be conveniently connected, and the hardness of the hard materials can ensure that the supporting rods can be fixedly connected and the supporting rods can normally work without deformation.
In this embodiment, the water outlet end of the back-washing water receiving member 14 is located at the bottom of the screen cylinder 2, a water outlet pipeline 16 connected with the water outlet end of the back-washing water receiving member passes through the middle part of the bottom end of the screen cylinder and the middle part 1 of the bottom end of the casing, the middle part of the bottom end of the screen cylinder is provided with an outwardly extending cylinder, a bearing 17 is arranged between the extending cylinder and the water outlet pipeline, the extending cylinder and the casing are rotatably arranged, a fixed driving wheel 18 is fixedly arranged at the outer end part of the extending cylinder, which exceeds the casing, and the fixed driving wheel 18 is in transmission connection with a motor 19 (the transmission connection can be in a gear connection or belt connection mode) and drives the screen cylinder 2 to rotate. In specific implementation, the position of the bearing needs to be provided with a sealing structure, which is common knowledge and is not described in detail here.
Like this, under the driven prerequisite of not influencing a sieve section of thick bamboo, conveniently draw the outlet conduit out the casing, avoid a sieve section of thick bamboo to go out the mud end because will set up into mud pipeline and the space is not enough, the inconvenient defect that sets up outlet conduit. By adopting the structure, the mud inlet conical cylinder at the outlet end of the mud inlet pipe can be directly installed and fixed on the mud inlet pipeline.
Wherein, the lower part of the mud outlet end of the screen cylinder 2 is provided with a mud outlet shuttle groove 20 in a connecting way. So that the mud can be discharged conveniently.
Referring to fig. 4, another embodiment is different in that (the rest may be the same as the first embodiment) the water outlet end of the backwash water receiving member 14 is located at the mud outlet end of the screen drum 2 and extends outward out of the housing, and then is connected out through a vertically arranged water outlet pipe, and a rotating shaft is installed at the middle part of the outer side of the bottom end of the screen drum 2 and connected with the motor.
Therefore, the water outlet pipeline of the back-washing water receiving component has a simple structure and is convenient for the connection of the screen cylinder and the motor. Adopt this kind of structure simultaneously, the awl section of thick bamboo 6 of advancing of mud pipe exit end can be for a sieve section of thick bamboo 2 fixed mounting for the during operation advances a mud awl section of thick bamboo and keeps rotatory for advancing the mud pipeline, and it breaks up the back and then enters into a sieve section of thick bamboo to enter into mud pipe entering into mud dispersion better, makes mud can disperse evenly better in a sieve section of thick bamboo sooner, improves its rotatory centrifugal dehydration effect.
In conclusion, the invention has the advantages of better improving the sludge dewatering effect and reducing the water content of the sludge.
The device can be used for realizing a sludge dewatering pretreatment concentration method, namely, a flocculating agent is added into sludge for conditioning and modification, then a rotary filter cylinder is used for centrifugally dewatering the conditioned sludge, a nozzle is used for back washing the outer surface of the filter cylinder in the centrifugal dewatering treatment process, the back washing water pressure is controlled and increased so that the back washing water can wash out filter meshes on the filter cylinder and can be injected into the filter cylinder, and a back washing water receiving member is arranged in the filter cylinder to receive the injected back washing water and lead the back washing water out of a shell. Therefore, the technical problem that the pressure of the backwashing water in the industry is difficult to accurately adjust and control is solved by adopting a simple means, and the dewatering effect of the sludge dewatering pretreatment is ensured.
Claims (7)
1. A sludge dewatering pretreatment device comprises a sludge conditioning device and a rotary drum concentrating and dewatering device, wherein the rotary drum concentrating and dewatering device comprises a shell which is horizontally and transversely fixedly arranged, a screen drum which is integrally and transversely arranged is vertically and rotatably arranged in the shell, one end of the screen drum is open and obliquely inclines downwards to form a sludge outlet end, a sludge inlet pipe which extends into the screen drum is arranged in the middle of the sludge outlet end of the screen drum, the outer end of the sludge inlet pipe is fixed relative to the shell and is externally connected with the sludge conditioning device for feeding sludge, the outlet end of the sludge inlet pipe extends towards the bottom of the inner end of the screen drum for discharging sludge, the screen drum is connected with a power device and can be driven to rotate by the power device, and the bottom of an inner cavity of the shell is provided with a water outlet which is positioned at the lowest position; the sieve drum is characterized in that the outlet end of the sludge inlet pipe is also connected with a frustum-shaped sludge outlet conical drum, the whole sludge outlet conical drum is horizontally arranged, the small-diameter end is connected with the outlet end of the sludge inlet pipe, and the large-diameter end surface is arranged opposite to the bottom of the inner end of the sieve drum;
the rotary drum concentration and dehydration device also comprises a back washing structure, the back washing structure comprises a row of nozzles which are axially arranged outside the screen drum, and the water outlet direction of the nozzles is arranged opposite to the screen drum;
a backwashing water receiving component is also arranged in the inner cavity of the screen cylinder, the backwashing water receiving component is integrally in a strip shape arranged along the axial direction of the screen cylinder and is integrally arranged in the direction close to the nozzle, a water receiving tank is formed on the backwashing water receiving component in the water outlet direction of the nozzle, one end of the backwashing water receiving component is integrally arranged in a downward inclined manner to form a water outlet end, and the water outlet end is connected to the outside of the shell through a water outlet pipeline;
the water receiving tank opening direction slope of back flush water receiving component sets up and first half adopts hard material, and the lower half adopts and takes elastic sheet to make for the water receiving tank lower half is piling up the sludge deposit back, and the lower half can be bent and make its interior sludge deposit roll-off water receiving tank by sludge deposit gravity.
2. The sludge dewatering pretreatment device of claim 1, wherein the sludge conditioning device comprises a conditioning agitation vessel, the conditioning agitation vessel is provided with the conditioning agitation device, the conditioning agitation vessel is connected with a sludge storage vessel through a sludge feeding pipe, and is connected with a flocculant adding vessel through a flocculant feeding pipe;
a sludge pump gate is arranged on the sludge feeding pipeline, and a quantitative pump gate is arranged on the flocculant feeding pipe;
stirring devices are arranged in the sludge storage container and the flocculating agent adding container.
3. The sludge dewatering pretreatment device of claim 1, wherein the screen cylinder comprises a frame body in a cylindrical shape and a filter material covered outside the frame body, and the filter material is made of a flexible woven material.
4. The sludge dewatering pretreatment apparatus of claim 1, wherein the nozzles are disposed at an upper position of the screen drum.
5. The sludge dewatering pretreatment device of claim 4, wherein the spray nozzle is provided on a cleaning water pipe integrally provided along an axial direction of the screen drum;
the cleaning water pipe is fixed on the shell, and one end of the cleaning water pipe is connected to the outside of the shell and is connected with a flushing water source through a booster pump.
6. The sludge dewatering pretreatment device of claim 5, wherein the nozzle is arranged at a density that gradually increases in a direction of the sludge outlet end of the screen drum.
7. A sludge dewatering pretreatment concentration method comprises the steps of firstly adding a flocculating agent into sludge for conditioning and modification, then carrying out centrifugal dewatering on the conditioned sludge by adopting a rotary filter cylinder, and carrying out back washing on the outer surface of the filter cylinder by adopting a nozzle in the centrifugal dewatering treatment process, wherein during back washing, the pressure of back washing water is controlled to be increased so that the back washing water rushes open filter meshes on the filter cylinder and is injected into the filter cylinder, and a back washing water receiving member is arranged in the filter cylinder to receive the injected back washing water and lead the back washing water out of a shell; the method is realized by the sludge dewatering pretreatment device according to claim 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010144420.2A CN111138065B (en) | 2020-03-04 | 2020-03-04 | Sludge dewatering pretreatment device and pretreatment concentration method thereof |
| CN202210653058.0A CN114890648B (en) | 2020-03-04 | 2020-03-04 | Rotary drum concentration dewatering device and back flush structure thereof |
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| CN202010144420.2A CN111138065B (en) | 2020-03-04 | 2020-03-04 | Sludge dewatering pretreatment device and pretreatment concentration method thereof |
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| US4439320A (en) * | 1976-07-07 | 1984-03-27 | Arie Blok | Solids concentrator |
| CN201309879Y (en) * | 2008-08-25 | 2009-09-16 | 杭州升蓝环保设备科技有限公司 | Rotary drum concentration dewatering integral machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5191565B2 (en) * | 2011-02-25 | 2013-05-08 | 寿工業株式会社 | Centrifugal dehydration method and centrifugal dehydration apparatus |
| CN206081855U (en) * | 2016-08-31 | 2017-04-12 | 广州绿鼎环保设备有限公司 | Concentrated extruder of rotary drum |
| CN211712926U (en) * | 2020-03-04 | 2020-10-20 | 重庆市三峡水务有限责任公司 | Back flush structure and rotary drum thickener thereof |
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2020
- 2020-03-04 CN CN202010144420.2A patent/CN111138065B/en active Active
- 2020-03-04 CN CN202210653058.0A patent/CN114890648B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4439320A (en) * | 1976-07-07 | 1984-03-27 | Arie Blok | Solids concentrator |
| CN201309879Y (en) * | 2008-08-25 | 2009-09-16 | 杭州升蓝环保设备科技有限公司 | Rotary drum concentration dewatering integral machine |
| CN201728016U (en) * | 2009-08-28 | 2011-02-02 | 多元水环保技术产业(中国)有限公司 | Sludge drum concentration belt type press dewatering all-in-one machine |
| CN101767922A (en) * | 2010-01-21 | 2010-07-07 | 上海亚同环保实业股份有限公司 | Sludge dehydration treatment technology |
| CN107759050A (en) * | 2017-11-27 | 2018-03-06 | 青岛城投娄山河水务有限公司 | A kind of novel barrate thickener |
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| CN114890648B (en) | 2023-07-04 |
| CN114890648A (en) | 2022-08-12 |
| CN111138065A (en) | 2020-05-12 |
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