CN113024060A - Sludge treatment system based on hydrodynamic cavitation - Google Patents
Sludge treatment system based on hydrodynamic cavitation Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 283
- 230000029087 digestion Effects 0.000 claims abstract description 84
- 238000004062 sedimentation Methods 0.000 claims description 91
- 239000010865 sewage Substances 0.000 claims description 40
- 238000005273 aeration Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000004659 sterilization and disinfection Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 230000009467 reduction Effects 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 238000004904 shortening Methods 0.000 abstract description 2
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- 238000000034 method Methods 0.000 description 11
- 208000034699 Vitreous floaters Diseases 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
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- 238000007667 floating Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910003480 inorganic solid Inorganic materials 0.000 description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
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- 241000894006 Bacteria Species 0.000 description 2
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- 244000005700 microbiome Species 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241000589651 Zoogloea Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 229910001385 heavy metal Inorganic materials 0.000 description 1
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- 230000000813 microbial effect Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge treatment system based on hydrodynamic cavitation. The technical scheme is as follows: the sludge treatment system based on hydrodynamic cavitation comprises a sludge pretreatment system, a sludge cavitation system, a sludge digestion system and a sludge post-treatment system; the sludge cavitation system is composed of a stator-rotor system, a motor drives a rotor rotating shaft to rotate, so that an impeller and blades are driven to rotate, and the holes in the blades enable sludge in a cavitation cavity to generate a cavitation effect under high-speed rotation, so that the purpose of sludge reduction is achieved. The invention achieves the purposes of shortening the digestion time, improving the sludge degradation efficiency and realizing the reduction, harmlessness and reclamation of the excess sludge by adding the sludge cavitation system.
Description
Technical Field
The invention relates to a sludge treatment system, in particular to a sludge treatment system based on hydrodynamic cavitation, and belongs to the technical field of municipal sewage and sludge treatment.
Background
In recent years, with the rapid development of domestic economic and scientific technology levels, water resources are becoming increasingly scarce as necessary resources for human daily life, the standard discharge treatment rate of sewage in China is improved continuously, but the harmless treatment rate of sludge generated by sewage is at a lower level. At present, more than 80% of sludge generated by sewage treatment plants in China is not properly treated, and the problems of random sludge stacking and pollution and re-pollution caused by the sludge are very serious, so that the sludge has attracted attention of the whole society. At present, sludge treatment facilities all over the country are not sound, and the treatment level of the established facilities is not uniform. In some areas, sludge is directly dewatered and dried and then composted or buried, pollutants, pathogens and heavy metals are not treated, so that the potential hazards of huge ecological pollution damage are caused, and accidents such as explosion and the like can occur in the process of transportation and landfill. Therefore, an effective method is needed to solve the problems of low sludge treatment efficiency, high cost, secondary pollution, etc.
Sewage treatment and sludge treatment are two systems which are important and closely related to solve the problem of urban water pollution.
The prior sludge treatment method in China mainly comprises sea filling, landfill, incineration and land utilization. The methods for treating sludge have advantages and disadvantages.
The sludge in cities is difficult to treat, the sludge of domestic urban sewage treatment plants is not available, the sludge available from the sewage treatment plants is almost a very delicate problem, no good solution exists, and the cities are trapped by the sludge.
As a new technology, the hydrodynamic cavitation technology has the characteristics of high efficiency, energy conservation, low cost, flexible management and the like, achieves the effects of breaking the wall of sludge cells in a biochemical pool and changing the zoogloea structure by utilizing the hydrodynamic cavitation effect, can realize the source reduction of sludge by combining the respiration of the original biochemical reaction system of a sewage plant, and has very wide application prospect in the field of sludge reduction.
Disclosure of Invention
The invention aims to provide a sludge treatment system based on hydrodynamic cavitation. The sludge cavitation system is added to achieve the purposes of shortening the digestion time, improving the sludge degradation efficiency and realizing the reduction, harmlessness and recycling of the excess sludge.
In order to achieve the purpose, the invention adopts the technical scheme that: a sludge treatment system based on hydrodynamic cavitation comprises a sludge pretreatment system, a sludge cavitation system, a sludge digestion system and a sludge post-treatment system; the sludge pretreatment system, the sludge cavitation system, the sludge digestion system and the sludge post-treatment system are sequentially connected; the sludge cavitation system comprises: comprises a stator device, a rotor device and a motor; the stator device comprises a stator shell, a cavitation cavity is arranged in the stator shell, and a feed inlet and a discharge outlet are formed in the stator shell; the rotor device comprises a rotating shaft and an impeller, the impeller and the rotating shaft are fixed and then are installed in a cavitation cavity of the stator device, the rotating shaft is fixed with the stator shell through a bearing seat, a plurality of blades are arranged on the impeller, and a plurality of through holes are formed in the blades; the motor drives the rotating shaft to rotate; the output shaft of the motor is connected with the rotating shaft through a coupling; and a sealing ring is arranged at the joint of the bearing seat and the stator shell.
Preferably, in the sludge treatment system based on hydrodynamic cavitation, the through hole is a venturi through hole.
Preferably, in the sludge treatment system based on hydrodynamic cavitation, the stator casing is provided with an air release valve.
Preferably, the sludge pretreatment system based on hydrodynamic cavitation is as follows: the primary sedimentation tank is connected with a sludge crusher after being sequentially connected with the coarse grating, the fine grating and the grit chamber.
Preferably, in the sludge treatment system based on hydrodynamic cavitation, the sludge post-treatment system is: the water outlet of the secondary sedimentation tank is connected with a sewage disinfection device; and a sedimentation outlet of the secondary sedimentation tank is connected with the sludge concentration tank.
Preferably, in the sludge treatment system based on hydrodynamic cavitation, the sludge digestion system is a co-constructed aeration nitrification system; the combined aeration nitrification system comprises a denitrification tank, a nitrification tank and an aeration device; the denitrification tank is communicated with the nitrification tank at the bottom, the aeration device is arranged at the bottom of the nitrification tank, and the inlet of the denitrification tank is communicated with the outlet of the nitrification tank to form internal circulation; the discharge port of the sludge cavitation system is connected with the denitrification tank, and the outlet of the nitrification tank is connected with the sludge post-treatment system.
Preferably, the sludge treatment system based on hydrodynamic cavitation is the sludge digestion system A2an/O anaerobic-aerobic digestion system; a is described2the/O anaerobic and aerobic digestion system comprises an anaerobic digestion tank, an anoxic digestion zone and an aerobic digestion zone; the discharge port of the sludge cavitation system is sequentially connected with the anaerobic digestion tank, the anoxic zone digestion zone and the aerobic zone digestion zone, and the outlet of the aerobic zone digestion zone is connected with the sludge post-treatment system.
Preferably, in the sludge treatment system based on hydrodynamic cavitation, the sludge digestion system is a biological rotating disc reaction system; the biological rotating disc reaction system comprises a pretreatment sedimentation tank and a biological rotating disc reactor, wherein an outlet of the sludge pretreatment system is connected with an inlet of the pretreatment sedimentation tank, a sedimentation outlet of the pretreatment sedimentation tank is connected with a feed inlet of the sludge cavitation system, and a discharge outlet of the sludge cavitation system is connected with an inlet of the pretreatment sedimentation tank to form circulation; the discharge outlet of the pretreatment sedimentation tank is connected with the inlet of the biological rotating disc reactor, and the outlet of the biological rotating disc reactor is connected with the secondary sedimentation tank of the sludge post-treatment system.
Preferably, in the sludge treatment system based on hydrodynamic cavitation, the precipitation outlet of the secondary sedimentation tank is connected with the feed inlet of the sludge cavitation system.
Preferably, in the sludge treatment system based on hydrodynamic cavitation, the sludge digestion system is a two-stage biological denitrification system; the two-stage biological nitrogen removal system comprises a digestion and nitridation tank, a sedimentation treatment tank and a denitrification reactor, wherein the outlet of the sludge pretreatment system is connected with the inlet of the digestion and nitridation tank, the outlet of the digestion and nitridation tank is connected with the inlet of the sedimentation treatment tank, the outlet of the sedimentation treatment tank is connected with the inlet of the denitrification reactor, the outlet of the denitrification reactor is connected with the secondary sedimentation tank of the sludge post-treatment system, the discharge port of the secondary sedimentation tank is connected with the feed inlet of the sludge cavitation system, and the discharge port of the sludge cavitation system is connected with the inlet of the digestion and nitridation tank.
The invention has the beneficial effects that:
1. the invention is provided with a sludge pretreatment system, sludge is subjected to pretreatment steps such as precipitation, grating, floccule crushing and the like, suspended matters are taken out, and the treated sludge enters a cavitation system through a pipeline for cavitation treatment, so that cavitation hole blockage caused by overlarge sludge floccule particles is prevented.
2. The sludge cavitation system is arranged, the blades are all provided with the Venturi through holes which are regularly distributed, and along with the rotation of the impeller, the sludge generates cavitation at the holes, the outer wall of the microorganism is crushed, the inner solution flows out, and the sludge treatment effect is enhanced.
3. The invention is provided with a digestion system, and takes out organic pollutants in the sludge by utilizing the metabolism of microorganisms. In the process, untreated new sludge needs to be properly added into cavitated sludge obtained after cavitation so as to ensure the optimal digestion efficiency, otherwise, the digestion speed of the sludge is influenced by too low content of activated sludge in a digestion system.
4. The invention is provided with a post-treatment system, and a finished product obtained after sludge digestion can be used as dry sludge for disposal and further processed as fertilizer.
Drawings
FIG. 1 is a schematic view of the sludge pretreatment system according to the present invention.
FIG. 2 is a schematic diagram of the sludge cavitation system of the present invention.
FIG. 3 is a front view of the impeller of the sludge cavitation system of the present invention.
FIG. 4 is a side view of the sludge cavitation system impeller of the present invention.
FIG. 5 is a schematic diagram of the structure of a Venturi through hole of the sludge cavitation system.
FIG. 6 is a schematic view of the sludge post-treatment system of the present invention.
FIG. 7 is a schematic structural diagram of a sludge treatment system based on hydrodynamic cavitation in example 1 of the present invention.
FIG. 8 is a schematic structural diagram of a sludge treatment system based on hydrodynamic cavitation in example 2 of the present invention.
FIG. 9 is a schematic structural diagram of a sludge treatment system based on hydrodynamic cavitation in example 3 of the present invention.
FIG. 10 is a schematic structural diagram of a sludge treatment system based on hydrodynamic cavitation in example 4 of the present invention.
Detailed Description
The present invention will be further described with reference to the following schematic drawings and examples for facilitating understanding of those skilled in the art, and the embodiments are not intended to limit the present invention.
Example 1
As shown in fig. 7, a sludge treatment system based on hydrodynamic cavitation includes a sludge pretreatment system 100, a sludge cavitation system 200, a sludge digestion system 300 and a sludge post-treatment system 400.
The sludge pretreatment system 100, the sludge cavitation system 200, the sludge digestion system 300 and the sludge post-treatment system 400 are connected in sequence.
As shown in fig. 1, the sludge pretreatment system 100 is: the primary sedimentation tank 101 is connected with a coarse grating 102, a fine grating 103 and a grit chamber 104 in sequence through pipelines, and then the tail end of the pipeline is connected with a sludge crusher 105. The sludge crusher 105 is connected to the feed inlet 205 of the sludge cavitation system 200 by piping and a pump 500. The working process and the function are as follows: the sewage is firstly treated by a primary sedimentation tank 101 to remove sinkable substances and floating substances in the sewage and remove sludge particles which may block or damage a hydrodynamic cavitation system, the sewage at the outlet end of the primary sedimentation tank 101 passes through a coarse grating and a fine grating and is used for intercepting coarse floaters and a large amount of small floaters in the sewage, a protection pump is not damaged, the outlet of the fine grating is connected with the inlet of a grit chamber, the grit chamber is mainly used for precipitating inorganic solids, the particle size of the sewage is removed by utilizing the natural sedimentation effect and is larger than 0.2mm, and the density is larger than 2.65t/m3The sand grains prevent the valve and the pipeline from being blocked, the outlet of the grit chamber is connected with the inlet of the sludge crusher, and sludge can be reduced after passing through the sludge crusher, so that the subsequent sludge cavitation treatment is facilitated.
As shown in fig. 2-5, the sludge cavitation system 200 is: comprises a stator device 201, a rotor device 202 and a motor 203; the stator arrangement 201 comprises a stator housing204, a cavitation cavity 212 is arranged in the stator shell 204, and a feed inlet 205 and a discharge outlet 206 are arranged on the stator shell 204; the rotor device 202 comprises a rotating shaft 207 and an impeller 208, the impeller 208 and the rotating shaft 207 are fixed and then installed in a cavitation cavity 212 of the stator device 201, the rotating shaft 207 is fixed with the stator shell 204 through a bearing seat 209, the impeller 208 is provided with a plurality of blades 210, and the blades 210 are provided with a plurality of through holes 211; the motor 203 drives the rotating shaft 207 to rotate; the output shaft of the motor 203 is connected with the rotating shaft 207 through a coupling 213; a sealing ring 214 is provided at the junction of the bearing seat 209 and the stator housing 204. The through hole 211 is a venturi through hole. The stator housing 204 is provided with a gas release valve 215. Preferably, the flow rate of the cavitation system is controlled to be 1500-2000 dm3The pressure is controlled to be 3-4 Bar. Preferably, the thickness of the blade 210 is 1-2 mm, the inner diameter of the Venturi through hole is 2-3 mm, the length of the throat part is 2-3 mm, and the emission angle alpha is 5-20 degrees.
As shown in fig. 6, the sludge post-treatment system 400 is: a water outlet of the secondary sedimentation tank 401 is connected with a sewage disinfection device 402; the sedimentation outlet of the secondary sedimentation tank 401 is connected with a sludge concentration tank 403.
In this embodiment, the sludge digestion system 300 is a combined aeration nitrification system. The combined aeration nitrification system comprises a denitrification tank 301, a nitrification tank 302 and an aeration device 303; the denitrification tank 301 is communicated with the nitrification tank 302 at the bottom, the aeration device 303 is arranged at the bottom of the nitrification tank 302, and the outlet of the nitrification tank 302 is communicated with the inlet of the denitrification tank 301 to form an internal small circulation; the discharge port 206 of the sludge cavitation system 200 is connected with the denitrification tank 301, and the outlet of the nitrification tank 302 is connected with the secondary sedimentation tank 401 of the sludge post-treatment system 400.
The combined aeration nitrification system has the following functions: nitrification, denitrification, and BOD removal are all included. The sludge cavitated by the sludge cavitation system 200 flows to the denitrification tank 301 and the nitrification tank 302 from the discharge hole. In the embodiment, the sludge cavitation system 200 and the combined aeration nitrification system are used for enabling the aerobic bacteria, the nitrifying bacteria and the denitrifying bacteria to be in the nitrification tank to form a mixed flora, so that the sludge cavitation nitrification system has great effects on changing the sludge sedimentation performance and controlling the sludge bulking.
In order to achieve better sludge treatment effect, the precipitation outlet of the secondary sedimentation tank 401 is connected with the feed inlet 205 of the sludge cavitation system 200 through a pipeline. Thus, the sludge cavitation system 200, the denitrification tank 301, the nitrification tank 302 and the secondary sedimentation tank 401 form an internal circulation, the pretreated sludge is circularly treated in the internal circulation system for a certain time, after being sufficiently digested and decomposed, and finally, after the secondary sedimentation tank 401 is layered, the water on the upper layer enters the sewage disinfection device 402 through the water outlet, and is disinfected and discharged, thereby meeting the discharge requirement. And the sediment at the lower layer enters a sludge concentration tank 403 through a sediment outlet for concentration, and the concentrated sludge is pressed into cakes or strips through a sludge homogenizer and a plate-and-frame filter press for sludge post-treatment.
Example 2
As shown in fig. 8, a sludge treatment system based on hydrodynamic cavitation includes a sludge pretreatment system 100, a sludge cavitation system 200, a sludge digestion system 300 and a sludge post-treatment system 400.
The sludge pretreatment system, the sludge cavitation system 200, the sludge digestion system 300 and the sludge post-treatment system 400 are connected in sequence.
As shown in fig. 1, the sludge pretreatment system 100 is: the primary sedimentation tank 101 is connected with a coarse grating 102, a fine grating 103 and a grit chamber 104 in sequence through pipelines, and then the tail end of the pipeline is connected with a sludge crusher 105. The sludge crusher 105 is connected to the feed inlet 205 of the sludge cavitation system 200 by piping and a pump 500. The working process and the function are as follows: the sewage is firstly treated by a primary sedimentation tank 101 to remove sinkable substances and floating substances in the sewage and remove sludge particles which may block or damage a hydrodynamic cavitation device, the sewage at the outlet end of the primary sedimentation tank 101 passes through a coarse grating and a fine grating and is used for intercepting coarse floaters and a large amount of small floaters in the sewage, a protection pump is not damaged, the outlet of the fine grating is connected with the inlet of a grit chamber, the grit chamber is mainly used for precipitating inorganic solids, the particle size of the sewage is removed by utilizing the natural sedimentation effect and is larger than 0.2mm, and the density is larger than 2.65t/m3The sand grains prevent the valve and the pipeline from being blocked, the outlet of the grit chamber is connected with the inlet of the sludge crusher, and the sludge can pass through the sludge crusher and then can be dischargedThe sludge floccule is reduced, and the subsequent sludge cavitation treatment is facilitated.
As shown in fig. 2-5, the sludge cavitation system 200 is: comprises a stator device 201, a rotor device 202 and a motor 203; the stator device 201 comprises a stator shell 204, a cavitation cavity 212 is arranged in the stator shell 204, and a feed inlet 205 and a discharge outlet 206 are arranged on the stator shell 204; the rotor device 202 comprises a rotating shaft 207 and an impeller 208, the impeller 208 and the rotating shaft 207 are fixed and then installed in a cavitation cavity 212 of the stator device 201, the rotating shaft 207 is fixed with the stator shell 204 through a bearing seat 209, the impeller 208 is provided with a plurality of blades 210, and the blades 210 are provided with a plurality of through holes 211; the motor 203 drives the rotating shaft 207 to rotate; the output shaft of the motor 203 is connected with the rotating shaft 207 through a coupling 213; a sealing ring 214 is provided at the junction of the bearing seat 209 and the stator housing 204. The through hole 211 is a venturi through hole. The stator housing 204 is provided with a gas release valve 215. Preferably, the flow rate of the cavitation system is controlled to be 1500-2000 dm3The pressure is controlled to be 3-4 Bar. Preferably, the thickness of the blade 210 is 1-2 mm, the inner diameter of the Venturi through hole is 2-3 mm, the length of the throat part is 2-3 mm, and the emission angle alpha is 5-20 degrees.
As shown in fig. 6, the sludge post-treatment system 400 is: a water outlet of the secondary sedimentation tank 401 is connected with a sewage disinfection device 402; the sedimentation outlet of the secondary sedimentation tank 401 is connected with a sludge concentration tank 403.
In this embodiment, the sludge digestion system 300 employs a2an/O anaerobic-aerobic digestion system; a is described2the/O anaerobic-aerobic digestion system comprises an anaerobic digester 304, an anoxic zone digestion zone 305 and an aerobic zone digestion zone 306; the discharge port 206 of the sludge cavitation system 200 is sequentially connected with an anaerobic digestion tank 304, an anoxic digestion zone 305 and an aerobic digestion zone 306, and the outlet of the aerobic digestion zone 306 is connected with a secondary sedimentation tank 401 of the sludge post-treatment system 400.
A2The function of the/O anaerobic and aerobic digestion system is as follows: the sludge cavitated by the sludge cavitation system 200 flows to the anaerobic digestion tank 304 for releasing phosphorus in the sludge, the outlet of the anaerobic digestion tank 304 is connected with the inlet of the anoxic digestion zone 305 for denitrification of the sludge, the anoxic digestion zone 305 and the aerobic digestion zone 306,removing BOD and organic nitrogen source pollutants in the sewage by utilizing the microbial digestion; the sludge is treated by the anoxic digestion zone 305 and the aerobic digestion zone 306, subjected to denitrification, dephosphorization and degradation of organic pollutants, and then enters the secondary sedimentation tank 401, so that the treatment efficiency of subsequent sludge digestion is improved.
In order to achieve better sludge treatment effect, the precipitation outlet of the secondary sedimentation tank 401 is connected with the feed inlet 205 of the sludge cavitation system 200 through a pipeline. Thus, the sludge cavitation system 200, the anaerobic digestion tank 304, the anoxic digestion zone 305, the aerobic digestion zone 306 and the secondary sedimentation tank 401 form an internal circulation, pretreated sludge is circularly treated in the internal circulation system for a certain time, after being sufficiently digested and decomposed, and finally, after the secondary sedimentation tank 401 is layered, water on the upper layer enters the sewage disinfection device 402 through a water outlet, is disinfected and then is discharged, so that the discharge requirement is met. And the sediment at the lower layer enters a sludge concentration tank 403 through a sediment outlet for concentration, and the concentrated sludge is pressed into cakes or strips through a sludge homogenizer and a plate-and-frame filter press for sludge post-treatment.
Example 3
As shown in fig. 9, a sludge treatment system based on hydrodynamic cavitation includes a sludge pretreatment system 100, a sludge cavitation system 200, a sludge digestion system 300 and a sludge post-treatment system 400.
The sludge pretreatment system, the sludge cavitation system 200, the sludge digestion system 300 and the sludge post-treatment system 400 are connected in sequence.
As shown in fig. 1, the sludge pretreatment system 100 is: the primary sedimentation tank 101 is connected with a coarse grating 102, a fine grating 103 and a grit chamber 104 in sequence through pipelines, and then the tail end of the pipeline is connected with a sludge crusher 105. The sludge crusher 105 is connected to the feed inlet 205 of the sludge cavitation system 200 by piping and a pump 500. The working process and the function are as follows: the sewage firstly goes through the primary sedimentation tank 101 to remove sinkable substances and floating substances in the sewage and remove sludge particles which may block or damage the hydrodynamic cavitation device, and the sewage at the outlet end of the primary sedimentation tank 101 passes through a coarse grating and a fine grating and is used for intercepting coarse floaters and a large amount of small floaters in the sewage and protecting the large floaters and the small floatersThe pump is protected from being damaged, the outlet of the fine grid is connected with the inlet of a grit chamber, the grit chamber mainly precipitates inorganic solids, and the natural sedimentation is utilized to remove the particles with the diameter larger than 0.2mm and the density larger than 2.65t/m in the sewage3The sand grains prevent the valve and the pipeline from being blocked, the outlet of the grit chamber is connected with the inlet of the sludge crusher, and sludge can be reduced after passing through the sludge crusher, so that the subsequent sludge cavitation treatment is facilitated.
As shown in fig. 2-5, the sludge cavitation system 200 is: comprises a stator device 201, a rotor device 202 and a motor 203; the stator device 201 comprises a stator shell 204, a cavitation cavity 212 is arranged in the stator shell 204, and a feed inlet 205 and a discharge outlet 206 are arranged on the stator shell 204; the rotor device 202 comprises a rotating shaft 207 and an impeller 208, the impeller 208 and the rotating shaft 207 are fixed and then installed in a cavitation cavity 212 of the stator device 201, the rotating shaft 207 is fixed with the stator shell 204 through a bearing seat 209, the impeller 208 is provided with a plurality of blades 210, and the blades 210 are provided with a plurality of through holes 211; the motor 203 drives the rotating shaft 207 to rotate; the output shaft of the motor 203 is connected with the rotating shaft 207 through a coupling 213; a sealing ring 214 is provided at the junction of the bearing seat 209 and the stator housing 204. The through hole 211 is a venturi through hole. The stator housing 204 is provided with a gas release valve 215. Preferably, the flow rate of the cavitation system is controlled to be 1500-2000 dm3The pressure is controlled to be 3-4 Bar. Preferably, the thickness of the blade 210 is 1-2 mm, the inner diameter of the Venturi through hole is 2-3 mm, the length of the throat part is 2-3 mm, and the emission angle alpha is 5-20 degrees.
As shown in fig. 6, the sludge post-treatment system 400 is: a water outlet of the secondary sedimentation tank 401 is connected with a sewage disinfection device 402; the sedimentation outlet of the secondary sedimentation tank 401 is connected with a sludge concentration tank 403.
In this embodiment, the sludge digestion system 300 is a biological rotating disc reaction system; the biological rotating disc reaction system comprises a pretreatment sedimentation tank 307 and a biological rotating disc reactor 308, wherein an outlet of the sludge pretreatment system 100 is connected with an inlet of the pretreatment sedimentation tank 307, a sedimentation outlet of the pretreatment sedimentation tank 307 and a sedimentation outlet of a secondary sedimentation tank 401 are respectively connected with a feeding port 205 of the sludge cavitation system 200, and a discharging port 206 of the sludge cavitation system 200 is connected with an inlet of the pretreatment sedimentation tank 307 to form a circulation; the discharge outlet of the pretreatment sedimentation tank 307 is connected with the inlet of the biological rotating disk reactor 308, and the outlet of the biological rotating disk reactor 308 is connected with the secondary sedimentation tank 401 of the sludge post-treatment system 400.
The biological rotating disc reaction system has the following functions: the sludge cavitated by the sludge cavitation system 200 enters the biological rotating disc reactor 308, organic pollutants in the sewage are adsorbed by using a biological film, and meanwhile, the organic matters are decomposed to form a continuous process of adsorption, oxidative decomposition and oxygen absorption, so that the sewage is continuously evolved. Purified water flowing out of the biological rotating disc enters a secondary sedimentation tank 401, after the secondary sedimentation tank 401 is layered, water on the upper layer enters a sewage disinfection device 402 through a water outlet, and is discharged after disinfection, so that the discharge requirement is met. And the sediment at the lower layer enters a sludge concentration tank 403 through a sediment outlet for concentration, and the concentrated sludge is pressed into cakes or strips through a sludge homogenizer and a plate-and-frame filter press for sludge post-treatment.
Example 4
As shown in fig. 10, a sludge treatment system based on hydrodynamic cavitation includes a sludge pretreatment system 100, a sludge cavitation system 200, a sludge digestion system 300 and a sludge post-treatment system 400.
The sludge pretreatment system, the sludge cavitation system 200, the sludge digestion system 300 and the sludge post-treatment system 400 are connected in sequence.
As shown in fig. 1, the sludge pretreatment system 100 is: the primary sedimentation tank 101 is connected with a coarse grating 102, a fine grating 103 and a grit chamber 104 in sequence through pipelines, and then the tail end of the pipeline is connected with a sludge crusher 105. The sludge crusher 105 is connected to the feed inlet 205 of the sludge cavitation system 200 by piping and a pump 500. The working process and the function are as follows: the sewage is firstly treated by a primary sedimentation tank 101 to remove sinkable substances and floating substances in the sewage and remove sludge particles which may block or damage a hydrodynamic cavitation device, the sewage at the outlet end of the primary sedimentation tank 101 passes through a coarse grating and a fine grating and is used for intercepting coarse floaters and a large amount of small floaters in the sewage, a protection pump is not damaged, the outlet of the fine grating is connected with the inlet of a grit chamber, the grit chamber is mainly used for precipitating inorganic solids and utilizes the self-sedimentation inorganic solidsThe particle size of the sewage removed by sedimentation is more than 0.2mm, and the density is more than 2.65t/m3The sand grains prevent the valve and the pipeline from being blocked, the outlet of the grit chamber is connected with the inlet of the sludge crusher, and sludge can be reduced after passing through the sludge crusher, so that the subsequent sludge cavitation treatment is facilitated.
As shown in fig. 2-5, the sludge cavitation system 200 is: comprises a stator device 201, a rotor device 202 and a motor 203; the stator device 201 comprises a stator shell 204, a cavitation cavity 212 is arranged in the stator shell 204, and a feed inlet 205 and a discharge outlet 206 are arranged on the stator shell 204; the rotor device 202 comprises a rotating shaft 207 and an impeller 208, the impeller 208 and the rotating shaft 207 are fixed and then installed in a cavitation cavity 212 of the stator device 201, the rotating shaft 207 is fixed with the stator shell 204 through a bearing seat 209, the impeller 208 is provided with a plurality of blades 210, and the blades 210 are provided with a plurality of through holes 211; the motor 203 drives the rotating shaft 207 to rotate; the output shaft of the motor 203 is connected with the rotating shaft 207 through a coupling 213; a sealing ring 214 is provided at the junction of the bearing seat 209 and the stator housing 204. The through hole 211 is a venturi through hole. The stator housing 204 is provided with a gas release valve 215. Preferably, the flow rate of the cavitation system is controlled to be 1500-2000 dm3The pressure is controlled to be 3-4 Bar. Preferably, the thickness of the blade 210 is 1-2 mm, the inner diameter of the Venturi through hole is 2-3 mm, the length of the throat part is 2-3 mm, and the emission angle alpha is 5-20 degrees.
As shown in fig. 6, the sludge post-treatment system 400 is: a water outlet of the secondary sedimentation tank 401 is connected with a sewage disinfection device 402; the sedimentation outlet of the secondary sedimentation tank 401 is connected with a sludge concentration tank 403.
In this embodiment, the sludge digestion system 300 is a two-stage biological denitrification system; the two-stage biological denitrification system comprises a digestion and nitridation tank 309, a sedimentation treatment tank 310 and a denitrification reactor 311, wherein an outlet of the sludge pretreatment system 100 is connected with an inlet of the digestion and nitridation tank 309, an outlet of the digestion and nitridation tank 309 is connected with an inlet of the sedimentation treatment tank 310, an outlet of the sedimentation treatment tank 310 is connected with an inlet of the denitrification reactor 311, an outlet of the denitrification reactor 311 is connected with a second-stage sedimentation tank 401 of the sludge post-treatment system 400, a discharge port of the second-stage sedimentation tank 401 is connected with a feed inlet 205 of the sludge cavitation system 200, and a discharge port 206 of the sludge cavitation system 200 is connected with an inlet of the digestion and nitridation tank 309. Preferably, a small sludge return is formed between the nitrification tank 309 and the sedimentation treatment tank 310. Preferably, a small sludge reflux is formed between the denitrification reactor 311 and the secondary sedimentation tank 401.
The two-stage biological denitrification system has the functions of: the sludge cavitated by the sludge cavitation system 200 enters the digestion nitridation tank 309 to remove BOD. In the denitrification reactor 311, under the condition of oxygen deficiency, the process adopts the cavitation sludge as a carbon source to be added into the denitrification reactor 311 for treatment. In the traditional secondary biological denitrification process, a carbon source needs to be added into a denitrification reaction tank, usually, methanol is added or raw wastewater is introduced as the carbon source.
Claims (10)
1. A sludge treatment system based on hydrodynamic cavitation, which is characterized in that the sludge treatment system based on hydrodynamic cavitation comprises a sludge pretreatment system (100), a sludge cavitation system (200), a sludge digestion system (300) and a sludge post-treatment system (400); the sludge pretreatment system (100), the sludge cavitation system (200), the sludge digestion system (300) and the sludge post-treatment system (400) are connected in sequence; the sludge cavitation system (200) is: comprises a stator device (201), a rotor device (202) and a motor (203); the stator device (201) comprises a stator shell (204), a cavitation cavity (212) is arranged in the stator shell (204), and a feed inlet (205) and a discharge outlet (206) are formed in the stator shell (204); the rotor device (202) comprises a rotating shaft (207) and an impeller (208), the impeller (208) and the rotating shaft (207) are fixed and then installed in a cavitation cavity (212) of the stator device (201), the rotating shaft (207) is fixed with the stator shell (204) through a bearing seat (209), a plurality of blades (210) are arranged on the impeller (208), and a plurality of through holes (211) are formed in the blades (210); the motor (203) drives the rotating shaft (207) to rotate; the output shaft of the motor (203) is connected with the rotating shaft (207) through a coupling (213); a sealing ring (214) is arranged at the joint of the bearing seat (209) and the stator shell (204).
2. The hydrodynamic cavitation-based sludge treatment system according to claim 1, wherein the through hole (211) is a venturi through hole.
3. The hydrodynamic cavitation-based sludge treatment system according to claim 1, wherein the stator housing (204) is provided with a gas release valve (215).
4. A hydrodynamic cavitation based sludge treatment system according to claim 1, 2 or 3, wherein the sludge pre-treatment system (100) is: the primary sedimentation tank (101) is connected with a sludge crusher (105) after being sequentially connected with the coarse grating (102), the fine grating (103) and the grit chamber (104).
5. The hydrodynamic cavitation-based sludge treatment system according to claim 4, wherein the sludge post-treatment system (400) is: the water outlet of the secondary sedimentation tank (401) is connected with a sewage disinfection device (402); the sedimentation outlet of the secondary sedimentation tank (401) is connected with a sludge concentration tank (403).
6. The hydrodynamic cavitation-based sludge treatment system according to claim 5, wherein the sludge digestion system (300) is a co-constructed aeration nitrification system; the combined aeration nitrification system comprises a denitrification tank (301), a nitrification tank (302) and an aeration device (303); the denitrification tank (301) is communicated with the nitrification tank (302) at the bottom, the aeration device (303) is arranged at the bottom of the nitrification tank (302), and the inlet of the denitrification tank (301) is communicated with the outlet of the nitrification tank (302) to form internal circulation; a discharge port (206) of the sludge cavitation system (200) is connected with the denitrification tank (301), and an outlet of the nitrification tank (302) is connected with the sludge post-treatment system (400).
7. The hydrodynamic cavitation-based sludge treatment system according to claim 5, wherein the sludge digestion system (300) is A2an/O anaerobic-aerobic digestion system; a is described2anaerobic/OThe aerobic digestion system comprises an anaerobic digestion tank (304), an anoxic digestion zone (305) and an aerobic digestion zone (306); a discharge port (206) of the sludge cavitation system (200) is sequentially connected with an anaerobic digestion tank (304), an anoxic zone digestion zone (305) and an aerobic zone digestion zone (306), and an outlet of the aerobic zone digestion zone (306) is connected with a sludge post-treatment system (400).
8. The hydrodynamic cavitation-based sludge treatment system according to claim 5, wherein the sludge digestion system (300) is a bio-disc reaction system; the biological rotating disc reaction system comprises a pretreatment sedimentation tank (307) and a biological rotating disc reactor (308), an outlet of the sludge pretreatment system (100) is connected with an inlet of the pretreatment sedimentation tank (307), a sedimentation outlet of the pretreatment sedimentation tank (307) is connected with a feeding hole (205) of the sludge cavitation system (200), and a discharging hole (206) of the sludge cavitation system (200) is connected with the inlet of the pretreatment sedimentation tank (307) to form circulation; the discharge outlet of the pretreatment sedimentation tank (307) is connected with the inlet of the biological rotating disc reactor (308), and the outlet of the biological rotating disc reactor (308) is connected with the secondary sedimentation tank (401) of the sludge post-treatment system (400).
9. The hydrodynamic cavitation-based sludge treatment system according to the claims 6, 7 and 8, wherein the precipitation outlet of the secondary sedimentation tank (401) is connected with the feed inlet (205) of the sludge cavitation system (200).
10. The hydrodynamic cavitation-based sludge treatment system of claim 5 wherein the sludge digestion system (300) is a two-stage biological denitrification system; the two-stage biological denitrification system comprises a digestion and nitridation tank (309), a sedimentation treatment tank (310) and a denitrification reactor (311), the outlet of the sludge pretreatment system (100) is connected with the inlet of the digestion and nitridation tank (309), the outlet of the digestion and nitridation tank (309) is connected with the inlet of the sedimentation treatment tank (310), the outlet of the sedimentation treatment tank (310) is connected with the inlet of the denitrification reactor (311), the outlet of the denitrification reactor (311) is connected with a secondary sedimentation tank (401) of the sludge post-treatment system (400), the discharge hole of the secondary sedimentation tank (401) is connected with a feed inlet (205) of the sludge cavitation system (200), and the discharge hole (206) of the sludge cavitation system (200) is connected with the inlet of the digestion and nitridation tank (309).
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