A sludge treatment device with deep dewatering function and a drying and carbonization method
By integrating sludge treatment methods, combining biological and chemical treatments, deep dewatering, drying, and carbonization of sludge have been achieved, solving the problem of sludge treatment throughout the entire process, reducing costs and carbon emissions, and improving the resource utilization efficiency of sludge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 上海中耀环保实业有限公司
- Filing Date
- 2023-11-09
- Publication Date
- 2026-07-17
Smart Images
Figure CN117285228B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of sludge treatment, disposal and resource utilization technology, specifically to a sludge treatment device with deep dewatering function and a drying and carbonization method. Background Technology
[0002] With the continuous increase in urbanization rate and the expansion of urban sewage treatment plant scale, the output of sludge in my country has also gradually increased. At the same time, the sludge in sewage treatment plants generally has a water content of about 80%, which is relatively high. If subsequent drying and carbonization are carried out, the treatment cost will be high. Therefore, an economical and efficient sludge treatment and disposal process is urgently needed.
[0003] High-pressure belt dewatering technology refers to a mechanical belt dewatering technology that reduces the moisture content of sludge from about 80% to 55%-70%. This technology operates continuously, with the sludge continuously acting inside for 3 to 5 minutes, resulting in high dewatering efficiency.
[0004] Sludge carbonization technology refers to the process of forming carbonization products at high temperatures of 250-700℃ in a low-oxygen or anaerobic environment. Because of the high reaction temperature and long reaction time, the sludge moisture content can be reduced to below 5%, and bacteria and viruses in the sludge can be killed, thus achieving the purpose of sludge reduction, stabilization and harmlessness.
[0005] Chinese patent (CN103951146B) discloses a method for combined sludge reduction and drying, which combines deep sludge dewatering with drying technology to dewater and dry sludge with a moisture content of 75%–85% to below 30%. However, this patent does not involve sludge carbonization processes and cannot meet the requirements for harmless treatment and disposal of sludge.
[0006] Chinese patent (CN105523699A) discloses a sludge drying and carbonization device and process. The sludge is successively fed into a drying furnace and a carbonization furnace for drying and carbonization, so as to achieve the requirements of sludge reduction, harmlessness and stabilization. This patent mainly focuses on the process and device of sludge drying and carbonization itself, and does not describe the entire process of sludge dewatering, drying, carbonization and subsequent resource utilization.
[0007] The complete process of sludge dewatering, drying, carbonization, and downstream resource recovery is currently lacking in technological processes. Therefore, this paper provides a sludge treatment device with deep dewatering function and a drying and carbonization method. Summary of the Invention
[0008] The purpose of this invention is to provide a sludge treatment device and a drying and carbonization method with a deep dewatering function to solve the problems mentioned in the background art.
[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution:
[0010] A sludge drying and carbonization method with advanced dewatering capabilities includes the following steps:
[0011] S1. Wastewater treatment;
[0012] S2, sludge dewatering;
[0013] S3, sludge drying;
[0014] S4, sludge carbonization;
[0015] S5. Crushing and sieving.
[0016] Step S1 includes the following specific steps:
[0017] S101. Wastewater is treated using biological methods, biofilm methods, or anaerobic biological methods to allow sludge to settle at the bottom of the wastewater, thereby reducing the sludge content in the wastewater. The sludge at the bottom of the wastewater is then centrally treated.
[0018] Step S3 includes the following specific steps:
[0019] S301. The sludge after step S2 is dried by directly or indirectly exchanging heat with high-temperature, low-humidity air. The sludge is dried and burned through a sludge drying device. High-temperature, low-humidity air is generated by combustion and directly or indirectly exchanges heat with the sludge after being treated by the high-pressure belt dewatering module in the drying furnace. After drying, the temperature of the sludge increases and the moisture content decreases.
[0020] Step S4 includes the following specific steps:
[0021] S401. High-temperature, low-oxygen, or oxygen-free gas is used to directly or indirectly transfer heat with the sludge dried in step S301 in a carbonization furnace to achieve sludge carbonization. The sludge carbonization device includes a sludge carbonization burner, a carbonization furnace, and a tail gas treatment device. The burner heats the dried sludge at high temperatures. The carbonization furnace reduces the oxygen content of the sludge combustion environment to create a low-oxygen carbonization environment. The tail gas treatment device treats the harmful gases generated during sludge carbonization.
[0022] Step S5 includes the following specific steps:
[0023] S501. The carbonized solid products of sludge are crushed and sieved according to different mesh sizes. The carbonized sludge is fully crushed, and then the carbon powder is sieved into different mesh sizes and recycled according to the mesh size of the carbon powder.
[0024] Step S2 includes the following specific steps:
[0025] S201. Dewater the sludge settled from the sewage by adding flocculant to the sludge to reduce the sludge moisture content from about 99% to about 80%. The flocculant is polyacrylamide (PAM). This process performs preliminary dewatering of the water in the sludge, reducing the workload and pressure of subsequent processing.
[0026] S202. Add conditioning agent and skeleton agent to the sludge treated in step S201, mix the sludge with conditioning agent and skeleton agent evenly, and mix the sludge with conditioning agent and skeleton agent evenly through the sludge conditioning module to achieve cell wall breaking of sludge extracellular polymer (EPS), release intracellular water, and improve the incompressibility of sludge.
[0027] S203. The sludge treated in step S202 is dewatered, and carbon powder is added to reduce the sludge moisture content from about 80% to 55% to 60%.
[0028] Step S2 includes the following specific steps:
[0029] S201. Dewater the sludge settled from the sewage by adding flocculant to the sludge to reduce the sludge moisture content from about 99% to about 80%. The flocculant is polyacrylamide (PAM) to perform preliminary dewatering of the water in the sludge.
[0030] S202. Add a conditioning agent to the sludge treated in step S201 and mix the sludge and conditioning agent evenly.
[0031] S203. The sludge treated in step S202 is dewatered without adding carbon powder, reducing the sludge moisture content from about 80% to 65% to 70%.
[0032] A sludge treatment device with deep dewatering function includes a wastewater treatment device, a primary sludge dewatering device, a sludge drying device, and a sludge carbonization device.
[0033] The sludge treatment device includes a sludge deep dewatering device and a crushing and screening device.
[0034] The sludge deep dewatering device includes a sludge conditioning module and a high-pressure belt conveyor dewatering module. The sludge conditioning module is connected to the outlet of the primary sludge dewatering device on one side and to the inlet of the high-pressure belt conveyor dewatering module on the other side. The outlet of the high-pressure belt conveyor dewatering module is connected to the sludge drying device.
[0035] A wastewater treatment device is installed on one side of the primary sludge dewatering device, and a deep sludge dewatering device is installed on the other side of the primary sludge dewatering device. The deep sludge dewatering device is located on one side of the sludge drying device. A sludge carbonization device is installed on the side of the sludge drying device away from the deep sludge dewatering device. The crushing and screening device is located on one side of the sludge carbonization device. A conveyor belt is installed between the crushing and screening device and the sludge carbonization device. The sludge carbonization device sends the carbonized sludge into the crushing and screening device via the conveyor belt.
[0036] The sludge conditioning module includes a U-shaped cylinder with a feeding port at the top and a chemical dosing port on one side. The inner wall of the U-shaped cylinder is equipped with a stirring shaft, which includes a right stirring shaft and a left stirring shaft. One end of the right stirring shaft is equipped with a right stirring blade, and one end of the left stirring shaft is equipped with a left stirring blade.
[0037] The high-pressure belt conveyor dewatering module includes a feed inlet, a three-axis feeding device at the bottom of the feed inlet, a lower filter cloth tensioning device at the bottom of the three-axis feeding device, a lower filter cloth correction device on one side of the lower filter cloth tensioning device, an upper filter cloth tensioning device at the top of the lower filter cloth correction device, an upper filter cloth correction device on one side of the upper filter cloth tensioning device, an upper filter cloth cleaning device on the side of the upper filter cloth correction device away from the upper filter cloth tensioning device, a lower filter cloth cleaning device on the side of the lower filter cloth correction device away from the lower filter cloth tensioning device, a filter press roller device at the bottom of the upper filter cloth cleaning device, a filter cloth driving device at the top of the upper filter cloth cleaning device, and upper and lower filter cloths wound around the outer wall of the filter press roller device.
[0038] The sludge enters the U-shaped cylinder, and the stirring shaft is driven to rotate by the drive device to uniformly mix the sludge with the conditioning agent and the skeleton agent. At the same time, the mixed mixture is transported to the sludge outlet. The stirring shaft is located inside the U-shaped cylinder and is connected to the drive device through a coupling.
[0039] The high-pressure belt dewatering module can achieve uniform distribution of sludge in the width direction of the filter cloth, forming a sandwich structure of filter cloth-sludge-filter cloth; on the other hand, it can achieve two-dimensional pressure filtration of the sludge sandwiched in the middle of the filter cloth in both the forward and tangential directions by rotating the rollers and applying the tension of the filter cloth, so that the sludge moisture content is reduced from about 80% to 55% to 70%.
[0040] The sludge uniform distribution device is located below the sludge inlet and adopts a three-axis design to evenly distribute the sludge on the effective width of the lower filter cloth. The upper and lower filter cloth correction device is located between the upper and lower filter cloth cleaning device and the upper and lower filter cloth tensioning device. It realizes automatic detection and automatic correction of the filter cloth through photoelectric signals and the extension and retraction movement of the cylinder.
[0041] The filter cloth tensioning device is located before the sludge inlet to ensure that the sludge maintains tension after entering the upper and lower filter cloths and forming a "sandwich" structure. The upper and lower filter cloth pressing roller device is staggered vertically or horizontally. The "sandwich" formed by the upper and lower filter cloths and sludge passes through the filter cloth pressing roller device, forming an S-shaped arrangement. This causes the sludge to be subjected to positive pressure and tangential shear force converted from the filter cloth tension, thereby completing the sludge dewatering and weight reduction. The upper and lower filter cloth driving device is located between the upper and lower filter cloth cleaning device and the upper and lower filter cloth pressing roller device. It drives the upper and lower drive rollers through a reduction motor, which drives the upper and lower filter cloths to move. The upper and lower filter cloth cleaning device is located between the upper and lower filter cloth driving device and the upper and lower filter cloth correction device. It washes the upper and lower filter cloths in real time through a fan-shaped water outlet nozzle arrangement to ensure the cleanliness of the filter cloths, thereby ensuring the sludge dewatering and weight reduction effect.
[0042] The triaxial feeding device consists of a feeding cloth, a roller shaft, and a motor. The outer wall of the roller shaft is in contact with the feeding cloth, and the output shaft of the motor is connected to the central rotating rod of the roller shaft. Starting the motor drives the roller shaft to rotate, which is used to convey sludge.
[0043] The upper filter cloth tensioning device and the lower filter cloth tensioning device are composed of filter cloth, roller and hydraulic cylinder. The outer wall of the roller is in contact with the filter cloth, and the two ends of the roller are connected to the output end of the hydraulic cylinder. The tension between the filter cloth and the outer wall of the roller is adjusted by telescopic hydraulic cylinder.
[0044] The upper filter cloth correction device and the lower filter cloth correction device are composed of filter cloth, sensor, hydraulic cylinder and roller. The filter cloth is wrapped around the outer wall of the roller. The hydraulic cylinder is set at both ends of the roller. The sensor is set at both ends of the roller. The position of the filter cloth rotating on the roller is detected by the sensor. After the filter cloth shifts to one end of the roller, the telescopic hydraulic cylinder drives the roller to deflect and adjust the position of the filter cloth on the roller.
[0045] The upper filter cloth cleaning device and the lower filter cloth cleaning device consist of a water pump, a nozzle and a water tank. The water tank stores water, the top of the water tank is connected to the water pump, one end of the water pump is connected to the nozzle, and the water pump sprays the water in the water tank out of the nozzle to rinse the filter cloth.
[0046] The filter press roller device consists of rollers and filter cloths. Multiple rollers are arranged in an alternating pattern. The filter cloths are wrapped around the outer wall of the rollers in an alternating pattern. Two filter cloths are wrapped around the same side of the same roller, so that the two filter cloths form an angle between them. Sludge is placed between the two filter cloths and the sludge between the two filter cloths is filtered by rotating the rollers.
[0047] The filter cloth drive device consists of a motor and a roller. The output shaft of the motor is connected to the central shaft of the roller. By starting the motor, the roller is driven to rotate, providing power to the filter press roller device.
[0048] The crushing and screening device includes a crushing mechanism and a screening mechanism. The bottom of the crushing mechanism is connected to the screening mechanism. The crushing mechanism includes a tank body, the bottom of which is connected to the screening mechanism. A feed hopper is provided at the top of the tank body. A motor is provided on one side of the tank body, and a power rotating rod is provided on the output shaft of the motor. The power rotating rod is connected to the inner wall of the tank body, and a crushing disc is provided at one end of the rotating rod. A movable disc is provided on one side of the crushing disc. The motor drives the power rotating rod to rotate, causing the power rotating rod to drive the crushing disc to rotate along the inner wall of the tank body. The crushing disc is in contact with the inner wall of the tank body. At the same time, the crushing disc is inclined about the power rotating rod. While rotating, the crushing disc can lift the carbon powder deposited at the bottom of the tank body, ensuring that the carbonized sludge is fully crushed and processed.
[0049] A positioning mechanism is provided on the side of the movable turntable away from the crushing turntable. A filter screen is provided at the bottom of the tank, and the inner side of the filter screen is connected to the crushing turntable. By rotating the crushing turntable in conjunction with the movable turntable on one side, the carbon powder between the movable turntables is processed. The movable turntable is also inclined relative to the inner wall of the tank. The movable turntable is stationary relative to the tank by the positioning mechanism, allowing the crushing turntable to move in a ring along one side of the movable turntable, which facilitates multi-stage uniform extrusion and crushing of the carbon powder.
[0050] The pulverizing disc includes a connecting sleeve, the inner wall of which is connected to a power rotating rod. The outer wall of the connecting sleeve is fitted with a power rotating disc, one side of which has a through hole, and the outer wall of which has a fixing protrusion. The through hole on one side of the power rotating disc facilitates the flow of carbonized sludge from the tank to both sides of the disc, ensuring uniform processing of the carbonized sludge by the pulverizing and screening device.
[0051] The positioning mechanism includes a positioning sleeve, the inner wall of which is connected to a power rotating rod. The outer wall of the positioning sleeve has a sliding groove, and a telescopic sleeve is provided on the outer wall of the positioning sleeve. The inner wall of the telescopic sleeve is provided with a spring. Several sliding grooves are provided, with adjacent sliding grooves connected at the same end. The inner wall of the positioning sleeve is engaged with the sliding groove by a locking block. When the crushing disc rotates, due to its tilted design, one side of the crushing disc pushes the movable disc to slide along the sliding groove, simultaneously compressing the spring. Simultaneously, the rotation of the crushing disc generates rotational friction on the movable disc. The movable disc rotates at a small angle through the slot connected at the same end of the sliding groove, pushing the carbon powder onto the filter screen and reducing carbon powder residue in the gap on one side of the movable disc.
[0052] The movable turntable includes a limiting sleeve, the inner wall of which is engaged with a positioning sleeve via a sliding groove. A pressing turntable is provided on the outer wall of the limiting sleeve, and pressing protrusions are provided on the outer wall of the pressing turntable. The pressing protrusions are arranged parallel to the fixed protrusions. When the crushing turntable rotates, the pressing protrusions and the fixed protrusions are pressed together. Both the pressing and fixed protrusions have rounded corners. After the pressing and pressing, vibrations are generated on the surfaces of the movable and crushing turntables, reducing the adhesion of carbon powder and improving the self-cleaning capability of the crushing and screening device.
[0053] The screening mechanism includes a housing connected to a tank. A discharge hopper is located at the bottom of the housing, a distribution port is located on one side of the housing, and a vibrating screen module is located on the other side of the housing. A sieve screen is installed on the inner wall of the housing. Carbon powder passing through the filter screen falls onto the sieve screen, which is arc-shaped and inclined relative to the horizontal plane. The vibrating screen module vibrates the sieve screen to separate the carbon powder. Two sieve screens are provided, distributed vertically along the inner wall of the housing, with their inclination angles staggered. The carbon powder is collected through the distribution port and then recycled according to different mesh sizes.
[0054] Compared with the prior art, the beneficial effects achieved by the present invention are:
[0055] 1. By setting up sewage treatment equipment, sludge primary dewatering equipment, sludge deep dewatering equipment, sludge drying equipment, sludge carbonization equipment, and crushing and screening equipment, the sludge moisture content is reduced, the calorific value of the sludge is increased, the scale of downstream drying and carbonization is reduced, investment and operating costs are reduced, and the carbon emission level during construction and operation is reduced. The carbonization products can be effectively reused as a carbon source in the sewage treatment process, as a skeleton agent in the high-pressure belt dewatering process, and as fuel required for the drying and carbonization process, realizing the internal recycling of carbon powder and reducing carbon emissions.
[0056] 2. By setting up a deep sludge dewatering device, the discharge of water from the sludge is accelerated, and the sludge drainage efficiency is improved. By uniformly mixing the sludge with the conditioning agent and the skeleton agent, the extracellular polymer of the sludge is broken, the intracellular water is released, the incompressibility of the sludge is improved, and the device is convenient for subsequent carbonization treatment of the sludge.
[0057] 3. The crushing and screening device improves the crushing efficiency of carbonized sludge and saves the operator's time. The rotation of the crushing disc generates rotational friction on the movable disc. The movable disc rotates at a small angle through the slot connected to the same end of the chute, pushing the carbon powder at the bottom of the tank onto the filter screen. At the same time, it reduces the residue of carbon powder in the gap on one side of the movable disc. After the extrusion protrusion and the fixed protrusion are squeezed, the surfaces of the movable disc and the crushing disc vibrate, reducing the adhesion of carbon powder and improving the self-cleaning ability of the device. Attached Figure Description
[0058] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:
[0059] Figure 1 This is a schematic diagram of the sludge drying and carbonization method of the present invention;
[0060] Figure 2 This is a schematic diagram of the overall structure of the present invention;
[0061] Figure 3 This is a schematic diagram of the sludge conditioning module structure of the present invention;
[0062] Figure 4 This is a schematic diagram of the high-voltage belt conveyor dehydration module of the present invention;
[0063] Figure 5 This is a schematic diagram of the stirring shaft structure of the present invention;
[0064] Figure 6 This is a schematic diagram of the crushing and screening device of the present invention;
[0065] Figure 7 This is a front view schematic diagram of the crushing and screening device of the present invention;
[0066] Figure 8 This is a front cross-sectional view of the crushing and screening device of the present invention;
[0067] Figure 9 This is a side view cross-sectional structural diagram of the crushing and screening device of the present invention;
[0068] Figure 10 This is a schematic diagram of the connection structure between the movable turntable and the power rotating rod of the crushing and screening device of the present invention;
[0069] Figure 11 This is a schematic diagram of the cross-sectional structure of the movable turntable of the crushing and screening device of the present invention;
[0070] Figure 12 This is a schematic diagram of the power rotor structure of the crushing and screening device of the present invention;
[0071] Figure 13 This is the invention Figure 11 Enlarged view of point A in the middle.
[0072] In the picture:
[0073] 1. Wastewater treatment equipment;
[0074] 2. Sludge primary dewatering device;
[0075] 3. Sludge deep dewatering device; 301. Sludge conditioning module; 3011. Feed inlet; 3012. Chemical dosing port; 3013. Agitator shaft; 30131. Right agitator shaft; 30132. Left agitator shaft; 30133. Right agitator blade; 30134. Left agitator blade; 3014. U-shaped cylinder; 3015. Discharge port; 302. High-pressure belt conveyor dewatering module; 3021. Feed inlet; 3022. Triaxial cloth feeding device; 30231. Upper filter cloth tensioning device; 30232. Lower filter cloth tensioning device; 30241. Upper filter cloth correction device; 30242. Lower filter cloth correction device; 30251. Upper filter cloth cleaning device; 30252. Lower filter cloth cleaning device; 3026. Filter press roller device; 3027. Filter cloth driving device; 30281. Upper filter cloth; 30282. Lower filter cloth;
[0076] 4. Sludge drying device;
[0077] 5. Sludge carbonization device;
[0078] 6. Crushing and screening device; 601. Crushing mechanism; 60101. Tank body; 60102. Feed hopper; 60103. Motor; 60104. Power rotor; 60105. Crushing turntable; 601051. Connecting sleeve; 601052. Power turntable; 601053. Through hole; 601054. Fixing protrusion; 60106. Positioning mechanism; 601061. Positioning sleeve; 60106 2. Slide groove; 601063. Telescopic sleeve; 601064. Spring; 60107. Movable turntable; 601071. Limiting sleeve; 601072. Extrusion turntable; 601073. Extrusion protrusion; 60108. Filter screen; 602. Screening mechanism; 60201. Box body; 60202. Discharge hopper; 60203. Distributor port; 60204. Vibrating screen module; 60205. Distributor screen. Detailed Implementation
[0079] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0080] Please see Figures 1-13 The present invention provides the following technical solution:
[0081] A sludge drying and carbonization method with advanced dewatering capabilities includes the following steps:
[0082] S1. Wastewater treatment;
[0083] S2, sludge dewatering;
[0084] S3, sludge drying;
[0085] S4, sludge carbonization;
[0086] S5. Crushing and sieving.
[0087] Step S1 includes the following specific steps:
[0088] S101. Wastewater is treated using biological methods, biofilm methods, or anaerobic biological methods to allow sludge to settle at the bottom of the wastewater, thereby reducing the sludge content in the wastewater. The sludge at the bottom of the wastewater is then centrally treated.
[0089] Step S3 includes the following specific steps:
[0090] S301. The sludge after step S2 is dried by directly or indirectly exchanging heat with high-temperature and low-humidity air. The sludge is dried and burned through a sludge drying device. High-temperature and low-humidity air is generated by combustion and directly or indirectly exchanging heat with the sludge after being treated by the high-pressure belt dewatering module in the drying furnace. After drying, the temperature of the sludge increases and the moisture content decreases.
[0091] Step S4 includes the following specific steps:
[0092] S401. High-temperature low-oxygen or oxygen-free gas is used to directly or indirectly transfer heat with the sludge dried in step S301 in a carbonization furnace to achieve sludge carbonization. The sludge carbonization device includes a sludge carbonization burner, a carbonization furnace, and a tail gas treatment device. The burner heats the dried sludge at high temperatures. The carbonization furnace reduces the oxygen content of the sludge combustion environment to create a low-oxygen carbonization environment. The tail gas treatment device treats the harmful gases generated during sludge carbonization.
[0093] Step S5 includes the following specific steps:
[0094] S501. The carbonized solid products of sludge are crushed and sieved according to different mesh sizes. The carbonized sludge is fully crushed, and then the carbon powder is sieved into different mesh sizes and recycled according to the mesh size of the carbon powder.
[0095] Example 1,
[0096] Step S2 includes the following specific steps:
[0097] S201. Dewater the sludge settled from the sewage by adding flocculant to the sludge to reduce the sludge moisture content from about 99% to about 80%. The flocculant is polyacrylamide (PAM) to perform preliminary dewatering of the water in the sludge.
[0098] S202. Add a conditioning agent to the sludge treated in step S201 and mix the sludge and conditioning agent evenly.
[0099] S203. The sludge treated in step S202 is dewatered without adding carbon powder, reducing the sludge moisture content from about 80% to 65% to 70%.
[0100] Example 2,
[0101] Step S2 includes the following specific steps:
[0102] S201. Dewater the sludge settled from the sewage by adding flocculant to the sludge to reduce the sludge moisture content from about 99% to about 80%. The flocculant is polyacrylamide (PAM). This process performs preliminary dewatering of the water in the sludge, reducing the workload and pressure of subsequent processing.
[0103] S202. Add conditioning agent and skeleton agent to the sludge treated in step S201, mix the sludge with conditioning agent and skeleton agent evenly, and mix the sludge with conditioning agent and skeleton agent evenly through the sludge conditioning module to achieve cell wall breaking of sludge extracellular polymer (EPS), release intracellular water, and improve the incompressibility of sludge.
[0104] S203. The sludge treated in step S202 is dewatered, and carbon powder is added to reduce the sludge moisture content from about 80% to 55% to 60%.
[0105] A sludge treatment device with deep dewatering function includes a wastewater treatment device 1, a primary sludge dewatering device 2, a sludge treatment device 3, a sludge drying device 4, a sludge carbonization device 5, and a crushing and screening device 6.
[0106] The sludge deep dewatering device 3 includes a sludge conditioning module 301 and a high-pressure belt dewatering module 302. The sludge conditioning module 301 is connected to the dewatering device 2 on one side and to the high-pressure belt dewatering module 302 on the other side. The bottom of the high-pressure belt dewatering module 302 is connected to the sludge drying device 4.
[0107] A wastewater treatment device 1 is installed on one side of the sludge primary dewatering device 2, and a sludge deep dewatering device 3 is installed on the other side of the sludge primary dewatering device 2. The sludge deep dewatering device 3 is located on one side of the sludge drying device 4. A sludge carbonization device 5 is installed on the side of the sludge drying device 4 away from the sludge deep dewatering device 3. A crushing and screening device 6 is located on one side of the sludge carbonization device 5. A conveyor belt is installed between the crushing and screening device 6 and the sludge carbonization device 5. The sludge carbonization device 5 sends the carbonized sludge into the crushing and screening device 6 via the conveyor belt.
[0108] The sludge conditioning module 301 includes a U-shaped cylinder 3014. A feeding port 3011 is provided at the top of the U-shaped cylinder 3014, and a chemical dosing port 3012 is provided on one side of the feeding port 3011. A stirring shaft 3013 is provided on the inner wall of the U-shaped cylinder 3014. The stirring shaft 3013 includes a right stirring shaft 30131 and a left stirring shaft 30132. A right stirring blade 30133 is provided at one end of the right stirring shaft 30131, and a left stirring blade 30134 is provided at one end of the left stirring shaft 30132.
[0109] The high-pressure belt conveyor dewatering module 302 includes a feed inlet 3021. A three-axis feeding device 3022 is located at the bottom of the feed inlet 3021. A lower filter cloth tensioning device 30232 is located at the bottom of the three-axis feeding device 3022. A lower filter cloth correction device 30242 is located on one side of the lower filter cloth tensioning device 30232. An upper filter cloth tensioning device 30231 is located at the top of the lower filter cloth correction device 30242. An upper filter cloth correction device 30241 is located on one side of the upper filter cloth tensioning device 30231. An upper filter cloth cleaning device 30251 is provided on the side away from the upper filter cloth tensioning device 30231. A lower filter cloth cleaning device 30252 is provided on the side away from the lower filter cloth tensioning device 30232. A filter press roller device 3026 is provided at the bottom of the upper filter cloth cleaning device 30251. A filter cloth driving device 3027 is provided at the top of the upper filter cloth cleaning device 30251. An upper filter cloth 30281 and a lower filter cloth 30282 are wound around the outer wall of the filter press roller device 3026.
[0110] The sludge enters the U-shaped cylinder 3014, and the stirring shaft 3013 is driven to rotate by the drive device to uniformly mix the sludge with the conditioning agent and the skeleton agent. At the same time, the mixed mixture is transported to the sludge outlet. The stirring shaft 3013 is located inside the U-shaped cylinder 3014 and is connected to the drive device through a coupling to improve the sludge drainage efficiency.
[0111] The high-pressure belt dewatering module 302 can achieve uniform distribution of sludge in the width direction of the filter cloth, forming a sandwich structure of filter cloth-sludge-filter cloth; on the other hand, it can achieve two-dimensional pressure filtration of the sludge sandwiched in the middle of the filter cloth in both the forward and tangential directions by rotating the rollers and applying the tension of the filter cloth, so that the moisture content of the sludge is reduced from about 80% to 55% to 60%.
[0112] The sludge uniform distribution device is located below the sludge inlet and adopts a three-axis design to evenly distribute the sludge on the effective width of the lower filter cloth 30282. The upper and lower filter cloth correction device is located between the upper and lower filter cloth cleaning device and the upper and lower filter cloth tensioning device. It realizes automatic detection and automatic correction of the filter cloth through photoelectric signals and the extension and retraction movement of the cylinder.
[0113] The filter cloth tensioning device is located before the sludge inlet to ensure that the sludge maintains tension after entering the upper and lower filter cloths and forming a "sandwich" structure. The upper and lower filter cloth pressing roller device is arranged in an S-shape by staggering the upper and lower or left and right sides. The "sandwich" formed by the upper and lower filter cloths and sludge passes through the filter cloth pressing roller device, and the sludge is subjected to positive pressure and tangential shear force converted from the filter cloth tension, thereby completing the sludge dewatering and weight reduction. The upper and lower filter cloth driving device is located between the upper and lower filter cloth cleaning device and the upper and lower filter cloth pressing roller device. It drives the upper and lower drive rollers through a geared motor, which drives the upper and lower filter cloths to move. The upper and lower filter cloth cleaning device is located between the upper and lower filter cloth driving device and the upper and lower filter cloth correction device. It washes the upper and lower filter cloths in real time through a fan-shaped water outlet nozzle arrangement to ensure the cleanliness of the filter cloths, thereby ensuring the sludge dewatering and weight reduction effect.
[0114] The three-axis feeding device 3022 consists of a feeding cloth, a roller shaft, and a motor. The outer wall of the roller shaft is in contact with the feeding cloth, and the output shaft of the motor is connected to the central rotating rod of the roller shaft. When the motor is started, it drives the roller shaft to rotate, which is used to convey sludge.
[0115] The upper filter cloth tensioning device 30231 and the lower filter cloth tensioning device 30232 are composed of filter cloth, roller and hydraulic cylinder. The outer wall of the roller is in contact with the filter cloth, and the two ends of the roller are connected to the output end of the hydraulic cylinder. The tension between the filter cloth and the outer wall of the roller is adjusted by telescopic hydraulic cylinder.
[0116] The upper filter cloth correction device 30241 and the lower filter cloth correction device 30242 are composed of filter cloth, sensor, hydraulic cylinder and roller. The filter cloth is wound around the outer wall of the roller. The hydraulic cylinder is set at both ends of the roller. The sensor is set at both ends of the roller. The position of the filter cloth rotating on the roller is detected by the sensor. After the filter cloth shifts to one end of the roller, the telescopic hydraulic cylinder drives the roller to deflect and adjust the position of the filter cloth on the roller.
[0117] The upper filter cloth cleaning device 30251 and the lower filter cloth cleaning device 30252 are composed of a water pump, a nozzle and a water tank. The water tank stores water. The top of the water tank is connected to the water pump. One end of the water pump is connected to the nozzle. The water pump sprays the water in the water tank out of the nozzle to rinse the filter cloth.
[0118] The filter press roller device 3026 consists of rollers and filter cloths. Multiple rollers are arranged in an alternating manner, and the filter cloths are wrapped around the outer wall of the rollers in an alternating manner. Two filter cloths are wrapped around the same side of the same roller, so that the two filter cloths form an angle between them. Sludge is placed between the two filter cloths and the sludge between the two filter cloths is pressed and filtered by rotating the rollers.
[0119] The filter cloth drive device 3027 consists of a motor and a roller. The output shaft of the motor is connected to the central shaft of the roller. By starting the motor, the roller is driven to rotate, providing power to the filter press roller device 2026.
[0120] The crushing and screening device 6 includes a crushing mechanism 601 and a screening mechanism 602. The bottom of the crushing mechanism 601 is connected to the screening mechanism 602. The crushing mechanism 601 includes a tank 60101. The bottom of the tank 60101 is connected to the screening mechanism 602. A feed hopper 60102 is provided on the top of the tank 60101. A motor 60103 is provided on one side of the tank 60101. A power rotating rod 60104 is provided on the output shaft of the motor 60103. The power rotating rod 60104 is connected to the inner wall of the tank 60101. A crushing turntable 60105 is provided at one end of the rotating rod 60104. A movable turntable 60107 is provided on one side of the crushing turntable 60105. The motor 60103 drives the power rod 60104 to rotate, which in turn drives the crushing disc 60105 to rotate along the inner wall of the tank 60101. The crushing disc 60105 is in contact with the inner wall of the tank 60101. At the same time, the crushing disc 60105 is tilted about the power rod 60104. While rotating, the crushing disc 60105 can lift up the carbon powder deposited at the bottom of the tank 60101, ensuring that the carbonized sludge is fully crushed and processed.
[0121] A positioning mechanism 60106 is provided on the side of the movable turntable 60107 away from the crushing turntable 60105. A filter screen 60108 is provided at the bottom of the tank 60101, and the inner side of the filter screen 60108 is connected to the crushing turntable 60105. By rotating the crushing turntable 60105 in conjunction with the movable turntable 60107 on one side, the carbon powder between the movable turntables 60107 is processed. The movable turntable 60107 is also inclined relative to the inner wall of the tank 60101. The movable turntable 60107 is stationary relative to the tank 60101 through the positioning mechanism 60106, so that the crushing turntable 60105 moves in a ring along one side of the movable turntable 60107, which facilitates multi-level uniform crushing of the carbon powder.
[0122] The pulverizing disc 60105 includes a connecting sleeve 601051, the inner wall of which is connected to the power rotating rod 60104. A power disc 601052 is mounted on the outer wall of the connecting sleeve 601051. A through hole 601053 is provided on one side of the power disc 601052, and a fixing protrusion 601054 is provided on the outer wall of the power disc 601053. The through hole 601053 on one side of the power disc 601052 facilitates the flow of carbonized sludge from the tank 60101 to both sides of the power disc 601052, thus facilitating the uniform processing of the carbonized sludge by the pulverizing and screening device.
[0123] The positioning mechanism 60106 includes a positioning sleeve 601061, the inner wall of which is connected to the power rotating rod 60104, the outer wall of which is provided with a sliding groove 601062, a telescopic sleeve 601063 on the outer wall of which is provided, and a spring 601064 on the inner wall of which is provided. Several chutes 601062 are provided, and the same end of adjacent chutes 601062 is connected. The inner wall of the positioning sleeve 601061 is engaged with the chutes 601062 by a locking block. When the crushing turntable 60105 rotates, due to the tilting of the crushing turntable 60105, one side of the crushing turntable 60105 pushes the movable turntable 60107 to slide along the chutes 601062, while compressing the spring 601064. At the same time, the rotation of the crushing turntable 60105 generates rotational friction on the movable turntable 60107. The movable turntable 60107 rotates at a small angle through the slot connected to the same end of the chutes 601062, pushing the carbon powder onto the filter screen 60108, while reducing the residue of carbon powder in the gap on one side of the movable turntable 60107.
[0124] The movable turntable 60107 includes a limiting sleeve 601071. The inner wall of the limiting sleeve 601071 is engaged with the positioning sleeve 601061 through a sliding groove 601062. The outer wall of the limiting sleeve 601071 is provided with a pressing turntable 601072, and the outer wall of the pressing turntable 601072 is provided with a pressing protrusion 601073. The extrusion protrusion 601073 and the fixed protrusion 601054 are arranged in parallel. When the crushing turntable 60105 rotates, the extrusion protrusion 601073 and the fixed protrusion 601054 are squeezed together. At the same time, both the extrusion protrusion 601073 and the fixed protrusion 601054 are rounded. After the extrusion protrusion 601073 and the fixed protrusion 601054 squeeze together, they vibrate the surfaces of the movable turntable 60107 and the crushing turntable 60105, reducing the adhesion of carbon powder and improving the self-cleaning ability of the crushing and screening device.
[0125] The screening mechanism 602 includes a housing 60201, which is connected to a tank 60101. A discharge hopper 60202 is provided at the bottom of the housing 60201, a distribution port 60203 is provided on one side of the housing 60201, a vibrating screen module 60204 is provided on the other side of the housing 60201, and a screening screen 60205 is provided on the inner wall of the housing 60201. The carbon powder passing through the filter screen 60108 falls onto the sieve screen 60205. The sieve screen 60205 is arc-shaped and inclined about the horizontal plane. The sieve screen 60205 is vibrated by the vibrating screen module 6024 to screen the carbon powder on the sieve screen 60205. There are two sieve screens 60205, which are distributed vertically about the inner wall of the box 60201. The inclination angles of the two sieve screens 60205 are staggered. The carbon powder is collected through the feed port 60201 and then recycled according to the carbon powder of different mesh sizes.
[0126] Working principle of the invention:
[0127] First, the sewage is injected into the sewage treatment device 1 and treated using biological, biofilm or anaerobic biological methods to make sludge settle out of the sewage. Then the sludge is introduced into the sludge primary dewatering device 2 for preliminary dewatering. The sludge settled out of the sewage is dewatered and flocculants are added to the sludge to reduce the sludge moisture content from about 99% to about 80%.
[0128] The initially dewatered sludge is then introduced into the sludge deep dewatering device 3. The sludge conditioning module 301 in the deep dewatering device 3 uniformly mixes the sludge with conditioning agents and skeleton agents, achieving cell wall disruption of the extracellular polymeric substances (EPS) and releasing intracellular water. The sludge, uniformly mixed with the conditioning agents and skeleton agents, is then poured into the high-pressure belt dewatering module 302. This achieves uniform distribution of the sludge along the width of the filter cloth, forming a filter cloth-sludge-filter cloth sandwich structure. Furthermore, the rotation of the rollers and the application of filter cloth tension further enhance the dewatering effect. Two-dimensional pressure filtration of the sludge sandwiched between filter cloths in both forward and tangential directions reduces the sludge moisture content from about 80% to 55%–60% (65%–70% without the addition of carbon powder). The sludge is then transferred to the drying device 4 via a transfer device, where high-temperature, low-humidity air is used to directly or indirectly exchange heat with the sludge to dry it. The dried sludge is then transferred to the sludge carbonization device 5 via a transfer device, where the sludge is dried using high-temperature, low-oxygen or oxygen-free gas and then undergoes direct or indirect heat transfer in the carbonization furnace to achieve sludge carbonization.
[0129] Finally, the carbonized sludge is poured into the crushing and screening device 6. The motor 60103 drives the power rotor 60104 to rotate, causing the power rotor 60104 to drive the crushing disc 60105 to rotate along the inner wall of the tank 60101. The crushing disc 60105 is in contact with the inner wall of the tank 60101, and is tilted relative to the power rotor 60104. During rotation, the crushing disc 60105 can lift up the carbon powder deposited at the bottom of the tank 60101, ensuring the carbonized sludge is properly treated. The charcoal powder is fully crushed by rotating the crushing turntable 60105 in conjunction with the movable turntable 60107 on one side. The movable turntable 60107 is also inclined relative to the inner wall of the tank 60101. The movable turntable 60107 is stationary relative to the tank 60101 by the positioning mechanism 60106, so that the crushing turntable 60105 moves in a ring along one side of the movable turntable 60107, which facilitates the multi-level uniform crushing of the charcoal powder.
[0130] The through-hole 601053 on one side of the power turntable 601052 facilitates the flow of carbonized sludge from the tank 60101 to both sides of the power turntable 601052, enabling the crushing and screening device to uniformly process the carbonized sludge. Several chutes 601062 are provided, with adjacent chutes 601062 connected at the same end. The inner wall of the positioning sleeve 601061 is engaged with the chutes 601062 via a locking block. When the crushing turntable 60105 rotates, due to its inclined arrangement, one side of the crushing turntable 60105 pushes the movable turntable 60107 to slide along the chutes 601062, simultaneously compressing the spring 601064. Simultaneously, the rotation of the crushing turntable 60105 generates rotational friction on the movable turntable 60107. The movable turntable 60107 rotates at a small angle through the slot connected to the same end of the sliding groove 601062, pushing the carbon powder onto the filter screen 60108. At the same time, it reduces the residue of carbon powder in the gap on one side of the movable turntable 60107. The extrusion protrusion 601073 and the fixed protrusion 601054 are arranged in parallel. When the crushing turntable 60105 rotates, the extrusion protrusion 601073 and the fixed protrusion 601054 are extruded. At the same time, both the extrusion protrusion 601073 and the fixed protrusion 601054 are rounded. After the extrusion protrusion 601073 and the fixed protrusion 601054 are extruded, the surfaces of the movable turntable 60107 and the crushing turntable 60105 are vibrated, reducing the adhesion of carbon powder and improving the self-cleaning ability of the crushing and screening device.
[0131] The carbon powder passing through the filter screen 60108 falls onto the sieve screen 60205. The sieve screen 60205 is arc-shaped and inclined about the horizontal plane. The sieve screen 60205 is vibrated by the vibrating screen module 6024 to screen the carbon powder on the sieve screen 60205. There are two sieve screens 60205, which are distributed vertically about the inner wall of the box 60201. The inclination angles of the two sieve screens 60205 are staggered. The carbon powder is collected through the feed port 60201 and then recycled according to the carbon powder of different mesh sizes.
[0132] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0133] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A sludge treatment device with advanced dewatering function, comprising a wastewater treatment device (1), a primary sludge dewatering device (2), a sludge drying device (4), and a sludge carbonization device (5), characterized in that: The sludge treatment device includes a sludge deep dewatering device (3) and a crushing and screening device (6). The sludge deep dewatering device (3) includes a sludge conditioning module (301) and a high-pressure belt dewatering module (302). The sludge conditioning module (301) is connected to the outlet of the sludge primary dewatering device (2) on one side and to the outlet of the high-pressure belt dewatering module (302) on the other side. The outlet of the high-pressure belt dewatering module (302) is connected to the sludge drying device (4). A sewage treatment device (1) is provided on one side of the sludge primary dewatering device (2), and a sludge deep dewatering device (3) is provided on the other side of the sludge primary dewatering device (2). The sludge deep dewatering device (3) is located on one side of the sludge drying device (4). A sludge carbonization device (5) is provided on the side of the sludge drying device (4) away from the sludge deep dewatering device (3). The crushing and screening device (6) is located on one side of the sludge carbonization device (5). A conveyor belt is installed between the crushing and screening device (6) and the sludge carbonization device (5). The sludge carbonization device (5) sends the carbonized sludge into the crushing and screening device (6) by the conveyor belt. The crushing and screening device (6) includes a crushing mechanism (601) and a screening mechanism (602). The crushing mechanism (601) includes a tank (60101). A motor (60103) is provided on one side of the tank (60101). A power rotating rod (60104) is provided on the output shaft of the motor (60103). A crushing turntable (60105) is provided at one end of the rotating rod (60104). A movable turntable (60107) is provided on one side of the crushing turntable (60105). A positioning mechanism (60106) is provided on the side of the movable turntable (60107) away from the crushing turntable (60105). A filter screen (60108) is provided at the bottom of the tank (60101), and the inner side of the filter screen (60108) is connected to the crushing turntable (60105).
2. The sludge treatment device with deep dewatering function according to claim 1, characterized in that: The sludge conditioning module (301) includes a U-shaped cylinder (3014), with a feeding port (3011) at the top of the U-shaped cylinder (3014) and a chemical dosing port (3012) on one side of the feeding port (3011). The inner wall of the U-shaped cylinder (3014) is provided with a stirring shaft (3013), which includes a right stirring shaft (30131) and a left stirring shaft (30132). One end of the right stirring shaft (30131) is provided with a right stirring blade (30133), and one end of the left stirring shaft (30132) is provided with a left stirring blade (30134). The high-pressure belt conveyor dewatering module (302) includes a feed inlet (3021). A three-axis fabric distribution device (3022) is located at the bottom of the feed inlet (3021). A lower filter cloth tensioning device (30232) is located at the bottom of the three-axis fabric distribution device (3022). A lower filter cloth correction device (30242) is located on one side of the lower filter cloth tensioning device (30232). An upper filter cloth tensioning device (30231) is located at the top of the lower filter cloth correction device (30242). An upper filter cloth correction device (30241) is located on one side of the upper filter cloth tensioning device (30231). An upper filter cloth cleaning device (30251) is provided on the side away from the upper filter cloth tensioning device (30231) of the device (30241). A lower filter cloth cleaning device (30252) is provided on the side away from the lower filter cloth tensioning device (30232) of the device (30242). A filter press roller device (3026) is provided at the bottom of the upper filter cloth cleaning device (30251). A filter cloth driving device (3027) is provided at the top of the upper filter cloth cleaning device (30251). An upper filter cloth (30281) and a lower filter cloth (30282) are wound around the outer wall of the filter press roller device (3026).
3. The sludge treatment device with deep dewatering function according to claim 1, characterized in that: The bottom of the crushing mechanism (601) is connected to the screening mechanism (602), the bottom of the tank (60101) is connected to the screening mechanism (602), the top of the tank (60101) is provided with a feed hopper (60102), the power rotating rod (60104) is connected to the inner wall of the tank (60101), and the crushing turntable (60105) is inclined about the power rotating rod (60104).
4. A sludge treatment device with advanced dewatering function according to claim 3, characterized in that: The crushing turntable (60105) includes a connecting sleeve (601051), the inner wall of which is connected to the power rotating rod (60104). A power turntable (601052) is provided on the outer wall of the connecting sleeve (601051). A through hole (601053) is provided on one side of the power turntable (601052). A fixing protrusion (601054) is provided on the outer wall of the power turntable (601053). The positioning mechanism (60106) includes a positioning sleeve (601061), the inner wall of which is connected to the power rotating rod (60104). A sliding groove (601054) is provided on the outer wall of the positioning sleeve (601061). 62), the outer wall of the positioning sleeve (601061) is provided with a telescopic sleeve (601063), the inner wall of the telescopic sleeve (601063) is provided with a spring (601064), the movable turntable (60107) includes a limiting sleeve (601071), the inner wall of the limiting sleeve (601071) is engaged with the positioning sleeve (601061) through a sliding groove (601062), the outer wall of the limiting sleeve (601071) is provided with a pressing turntable (601072), the outer wall of the pressing turntable (601072) is provided with a pressing protrusion (601073), the pressing protrusion (601073) and the fixed protrusion (601054) are arranged in parallel and both are rounded.
5. A sludge treatment device with deep dewatering function according to claim 1, characterized in that: The screening mechanism (602) includes a box (60201) connected to a tank (60101). A discharge hopper (60202) is provided at the bottom of the box (60201). A distribution port (60203) is provided on one side of the box (60201). A vibrating screen module (60204) is provided on the other side of the box (60201). A screen (60205) is provided on the inner wall of the box (60201). The screen (60205) is arc-shaped and inclined about the horizontal plane. Two screens (60205) are distributed vertically about the inner wall of the box (60201) and their inclination angles are staggered.
6. A sludge treatment device with advanced dewatering function according to claim 1, characterized in that: It also includes a sludge drying and carbonization method with advanced dewatering capabilities, which comprises the following steps: S1. Wastewater treatment; S2, sludge dewatering; S3, sludge drying; S4, sludge carbonization; S5. Crushing and sieving.
7. A sludge treatment device with advanced dewatering function according to claim 6, characterized in that: Step S1 includes the following specific steps: S101. Wastewater is treated using biological methods, biofilm methods, or anaerobic biological methods to remove sludge from the bottom of the wastewater. Step S3 includes the following specific steps: S301. The sludge after step S2 is dried by directly or indirectly exchanging heat between high-temperature, low-humidity air and sludge. Step S4 includes the following specific steps: S401. The sludge dried in step S301 is directly or indirectly heated in a carbonization furnace by using high-temperature low-oxygen or oxygen-free gas to achieve sludge carbonization. Step S5 includes the following specific steps: S501. The carbonized solid products of sludge are crushed and sieved according to different mesh sizes.
8. A sludge treatment device with deep dewatering function according to claim 7, characterized in that: Step S2 includes the following specific steps: S201. Dewater the sludge settled from the sewage by adding flocculant to the sludge to reduce the sludge moisture content from about 99% to about 80%. S202. Add conditioner and skeletonizer to the sludge treated in step S201, and mix the sludge with conditioner and skeletonizer evenly. S203. The sludge after step S202 is dewatered, and carbon powder is added to reduce the sludge moisture content from about 80% to 55%~60%.
9. A sludge treatment device with deep dewatering function according to claim 7, characterized in that: Step S2 includes the following specific steps: S201. Dewater the sludge settled from the sewage by adding flocculant to the sludge to reduce the sludge moisture content from about 99% to about 80%. S202. Add a conditioning agent to the sludge treated in step S201 and mix the sludge and conditioning agent evenly. S203. Dewater the sludge after step S202 without adding carbon powder, reducing the sludge moisture content from about 80% to 65%~70%.