CN108178492B - Municipal domestic sludge air flotation concentration treatment equipment and method - Google Patents
Municipal domestic sludge air flotation concentration treatment equipment and method Download PDFInfo
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- CN108178492B CN108178492B CN201810037247.9A CN201810037247A CN108178492B CN 108178492 B CN108178492 B CN 108178492B CN 201810037247 A CN201810037247 A CN 201810037247A CN 108178492 B CN108178492 B CN 108178492B
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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Abstract
The invention relates to a sludge treatment technology, in particular to municipal domestic sludge air flotation concentration treatment equipment and a municipal domestic sludge air flotation concentration treatment method, and belongs to the technical field of wastewater and waste gas treatment. An air flotation concentration treatment device for municipal domestic sludge comprises a sludge conditioning unit for quantitatively adding, mixing and reacting, and a cavitation air flotation concentration unit for dissolving air in sludge and completing separation; the cavitation air flotation concentration unit is internally provided with an air flotation head used for cavitation dissolved air, the air flotation head is connected with the hollow rotating shaft, the air flotation head comprises a central disc communicated with the rotating shaft and a plurality of dissolved air branch pipes arranged on the side part of the central disc, and the dissolved air branch pipes are provided with a plurality of micropores used for ventilation. The equipment has the advantages of large single-machine processing capacity, short concentration time, simple equipment, electricity conservation, adjustable reflux ratio and the like, and effectively solves the problems of large occupied area, sludge corrosion, phosphorus release reaction, numerous and complicated equipment and the like in the process of concentrating municipal domestic sludge.
Description
Technical Field
The invention relates to a sludge treatment technology, in particular to municipal domestic sludge air flotation concentration treatment equipment and a municipal domestic sludge air flotation concentration treatment method, and belongs to the technical field of wastewater and waste gas treatment.
Background
Along with the acceleration of the urbanization process in China, the domestic sewage treatment rate is gradually improved, sludge generated in the domestic sewage treatment process has the characteristics of high water content, large volume, high organic matter content, poor stability, malodor and the like, the quantity of the sludge is more and more, and meanwhile, due to the high cost of sludge treatment and the threat of toxic substances and pathogens in the sludge to the environment and human health, the environmental problems caused by the sludge treatment are increasingly prominent, and the sludge treatment and disposal attract high attention.
The treatment technology of the municipal domestic sludge mainly comprises sludge concentration dehydration, aerobic digestion, anaerobic digestion, drying, composting, incineration and the like. The sludge concentration and dehydration is the first step of sludge treatment and disposal, and has important significance for reducing the volume of the sludge for subsequent treatment, facilitating the sludge transportation and the normal operation of the subsequent treatment process. The sludge concentration technology mainly comprises gravity concentration, mechanical concentration and air flotation concentration, and the sludge concentration technology of municipal sewage treatment plants in China mainly adopts gravity concentration.
The traditional gravity concentration and mechanical concentration are still the mainstream sludge concentration process of the current domestic sewage treatment plant, the application proportion of the gravity concentration process in the domestic sewage treatment plant is more than 70%, but the two processes have many problems in the application process.
At present, the gravity concentration tank is still the main technology for sludge concentration of the municipal sewage treatment plant. Although the process technology, the structure and the operation management are simple, the occupied area is large, and the sanitary condition is poor. When aeration stirring is not carried out, anaerobic digestion of sludge possibly occurs in the tank, the sludge floats upwards, so that the concentration effect is influenced, and phosphorus absorbed by the sludge is released and enters the sewage again to cause the phosphorus in the effluent to exceed the standard. The underwater bearing installed in the center of the gravity concentration tank is prone to failure, the stirring grid is prone to corrosion, and frequent maintenance is needed. The sludge solid content after gravity concentration is low, particularly for the gravity concentration of the residual activated sludge, the sludge solid content after concentration is not more than 4 percent, the solid content is low, the volume of a subsequent treatment structure is increased, the investment and the operation cost are increased, and along with the development of a sewage treatment process and the improvement of a sewage treatment standard, particularly the improvement of the requirements on nitrogen and phosphorus removal, the application of the gravity concentration process in the aspect of the residual activated sludge concentration is limited.
The mechanical concentration comprises centrifugal concentration, belt type concentrator concentration, rotary drum concentration, screw pressure concentrator concentration and the like. The centrifugal concentration occupies small area, can not generate stink, can avoid secondary release of phosphorus for the phosphorus-rich sludge, improves the total phosphorus removal rate of a sludge treatment system, has low manufacturing cost, but has high running cost and mechanical maintenance cost and poor economy, is generally rarely used for sludge concentration, and can be considered for residual activated sludge which is difficult to concentrate. The belt type thickener is mainly used for a thickening section of sludge thickening and dewatering integrated equipment and mainly comprises a frame, a sludge feeding and batching device, dewatering filter cloth, an adjustable mud rake and a mud dam. The belt concentrator has the common faults of filter belt deviation, sludge overflow, arch camber and the like, and the operation and the environment of the belt concentrator are influenced. The rotary drum and the screw press thickener or similar devices are mainly used in the concentration section of the concentration and dehydration integrated equipment, the rotary drum and the screw press thickener are used for carrying out screw propulsion dehydration and extrusion dehydration on chemically coagulated sludge, and the rotary drum and the screw press thickener are simple, convenient and efficient mechanical equipment for reducing the water content of the sludge.
The domestic air flotation concentration technology is relatively less in application, and related process parameters and equipment are lack of systematic research. Abroad, Simona Cizinska in Sweden in 1983 develops a biological air flotation sludge concentration process, nitrate is added to utilize the denitrification capacity of sludge, and the sludge undergoes denitrification to generate gas so as to float up the sludge for concentration. The daily operation cost of the biological air flotation concentration process is lower than that of the pressure dissolved air flotation sludge concentration process, the energy consumption is low, the equipment is simple, the operation and the management are convenient, but the sludge retention time is longer than that of the pressure dissolved air flotation concentration process, and nitrate needs to be added.
The air flotation concentration is classified into dissolved air flotation, biological air flotation and cavitation air flotation. The dissolved air flotation is applied more, but has the problems of complex equipment, difficult operation and management and the like; the biological air flotation utilizes the denitrification of sludge, is simple to operate and low in energy consumption, has long retention time, and is easy to generate odor and generate phosphorus release reaction; the cavitation air flotation has the advantages of simple equipment, short retention time, no anaerobic reaction, no phosphorus release reaction and the like, has great advantages in concentration effect and investment cost, but has less application of domestic air flotation concentration technology, and lacks of system research on relevant process parameters and equipment.
Disclosure of Invention
The invention provides municipal domestic sludge air flotation concentration treatment equipment which has the advantages of short concentration time, simple equipment, electricity conservation, adjustable reflux ratio and the like, and effectively solves the problems of large occupied area, sludge corrosion, phosphorus release reaction, numerous and complicated equipment and the like in the municipal domestic sludge concentration treatment process.
The invention also provides a municipal domestic sludge concentration treatment method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an air flotation concentration treatment device for municipal domestic sludge comprises a sludge conditioning unit for quantitatively adding, mixing and reacting, and a cavitation air flotation concentration unit for dissolving air in sludge and completing separation; the cavitation air flotation concentration unit is internally provided with an air flotation head used for cavitation dissolved air, the air flotation head is connected with the hollow rotating shaft, the air flotation head comprises a central disc communicated with the rotating shaft and a plurality of dissolved air branch pipes arranged on the side part of the central disc, and the dissolved air branch pipes are provided with a plurality of micropores used for ventilation.
The residual sludge generated in the municipal domestic sewage treatment process enters the municipal domestic sludge air-flotation concentration treatment equipment after chemical conditioning, air-flotation separation is realized after cavitation air dissolution, the floated sludge is dehydrated, clear liquid is sent back to the sewage treatment system, the concentrated mixed liquid is subjected to cavitation air dissolution and air-flotation separation again after internal circulation, continuous sludge concentration is realized, and the sludge air-flotation concentration treatment equipment has the advantages of short concentration time, simple equipment, electricity conservation, adjustable reflux ratio and the like, effectively solves the problems of large occupied area, sludge decay, phosphorus release reaction, numerous and miscellaneous equipment and the like in the municipal domestic sludge concentration treatment process, and has wide technical advancement and beneficial effects.
The invention utilizes the cavitation air flotation principle, realizes better sludge concentration treatment effect under specific operation control parameters through chemical conditioning, has the advantages of small occupied area, short retention time, low construction cost, simple and convenient management and operation, low operation cost and the like, and has no risk of generating odor by anaerobic reaction and water quality disqualification caused by phosphorus release reaction.
An adjustable water outlet weir and a central reaction cylinder in the cavitation air flotation concentration unit are used for controlling the reflux ratio; the highest single machine processing capacity is more than or equal to 250t/h, and the requirements of sewage treatment plants of various scales can be met.
Preferably, the cavitation air flotation concentration unit comprises a cavitation air flotation concentration tank, the sludge conditioning unit is communicated with the bottom of the cavitation air flotation concentration tank through a central feeding pipe, a central reaction cylinder is arranged at the center in the cavitation air flotation concentration tank, the middle section of the central reaction cylinder is cylindrical, the upper end and the lower end of the central reaction cylinder are both horn mouths, the air flotation head is arranged at the axle center in the central reaction cylinder, an adjustable water outlet weir is arranged on the inner wall of the cavitation air flotation concentration tank, and a sludge tank is arranged between the outer edge of the top of the central reaction cylinder and the inner wall of the cavitation air flotation concentration tank.
Preferably, the sludge conditioning unit is a conditioning tank, and the cavitation air flotation concentration tank is provided with a double-cone bottom.
Preferably, the air flotation head is positioned at the bottom in the central reaction cylinder and at the inlet of the lower bell mouth of the central reaction cylinder.
Preferably, a mud guard higher than the liquid level is arranged on one side of the sludge tank close to the inner wall of the cavitation air flotation concentration tank, the mud guard enables the left side and the right side of the sludge tank to be higher and lower, so that the concentrated sludge can be collected, and clear liquid overflows from the mud guard and flows to the adjustable effluent weir.
Preferably, the top of the central disc is provided with an opening which is matched and connected with the rotating shaft, the inner part of the central disc is a cylinder with a cavity, and a plurality of side holes which are matched and connected with the dissolved air branch pipes are uniformly distributed on the outer wall of the central disc.
Preferably, the dissolved air branch pipes are radially and uniformly distributed around the central disc by taking the central disc as the center.
Preferably, the dissolved air branch pipe is a hollow linear pipe or a curved pipe. Because the linear type pipe has a regular structure and is convenient to process, the linear type pipe can be used as a better choice for the dissolved air branch pipe under the condition that the diameter of the air floatation head is smaller; the rotation speed of the air floating head is generally 1500r/min-3500r/min in the high-speed rotation process, the linear velocity of the far end of the air dissolving branch pipe is larger than that of other parts along with the increase of the diameter of the air floating head, and because the pressure difference resistance of liquid and the velocity form a quadratic relation, a large amount of power is consumed on overcoming the pressure difference resistance after the air dissolving requirement is met. At the moment, the curve type pipe is used as the dissolved air branch pipe, and after the linear speed required by dissolved air is met at a common rotating speed, the far-end part of the dissolved air branch pipe deviates from the rotating direction and is bent into a streamline shape, so that the velocity vector perpendicular to the dissolved air branch pipe is reduced, and the pressure difference resistance is greatly reduced. Although the velocity vector of the bent part along the dissolved air branch pipe is objectively increased in the process, the viscous resistance is in direct proportion to the first power of the velocity, and the differential pressure resistance is in direct proportion to the second power of the velocity, comprehensively, under the condition of the same air flotation head diameter, the dissolved air branch pipe of the curve type pipe can reduce the running resistance by more than 20%, and the resistance reduction effect is further optimized along with the increase of the diameter of the air flotation head, so that the corresponding power consumption is reduced, and the energy-saving effect is good.
Preferably, the number of the dissolved air branch pipes is more than 2.
Preferably, the micropores are arranged on one side of the dissolved air branch pipe, which is far away from the rotating direction. The advantage of design like this is, when the air supporting head is rotatory clockwise at a high speed, there is the separation trend at the rotation direction back dissolved air branch pipe and liquid, forms the low pressure environment, and here pressure is less than surrounding liquid and atmospheric pressure, and the air gets into liquid through rotation axis, central disc, dissolved air branch pipe and micropore to disperse into tiny bubble under the stirring effect of dissolved air branch pipe high speed rotation, so that wrap up in the mud and other solid particle come-up in the liquid of holding, realize the process of dissolved air, air supporting separation.
Preferably, the diameter of the micropores is 0.1mm-20 mm.
A municipal domestic sludge concentration treatment method comprises the following steps: municipal domestic sludge enters a sludge conditioning unit, PAM is added, stirred and conditioned, and then enters a cavitation air flotation concentration tank through a central feeding pipe under the action of gravity; the dosage of PAM is 1.5kg/tDS-2.5 kg/tDS; in the cavitation air flotation concentration tank, efficient and uniform air dissolution is realized through an air flotation head, bubbles are wrapped by sludge particles and quickly float in a central reaction cylinder under the drive of buoyancy and water flow, the bubbles are diffused towards the periphery in the horizontal direction after being decelerated through a diffusion section at the upper part of the central reaction cylinder, the sludge dissolved with the bubbles is separated from water, the sludge is collected and discharged through a sludge groove, separated clear liquid is collected and discharged through an adjustable water outlet weir, part of unseparated sludge enters the central reaction cylinder again along a circulation channel between the central reaction cylinder and the air flotation tank, and the unseparated sludge and newly entered sludge are dissolved with air again for air flotation concentration separation.
In the cavitation air flotation concentration tank, the air flotation time is less than or equal to 1min, the separation time is less than or equal to 8min, the reflux ratio is 10-150%, the power consumption per ton of sludge per hour in air flotation concentration is less than or equal to 50w, and the dissolved air amount is more than or equal to 10 mL/L.
The invention has the beneficial effects that: the municipal domestic sludge concentration treatment method provided by the invention is used for performing air flotation concentration after simple chemical conditioning. By utilizing the cavitation dissolved air principle and through the improved cavitation air flotation concentration unit, the single machine treatment capacity is more than 250t/h, the retention time is less than or equal to 9min, and the water content of the discharged mud is less than or equal to 96 percent. Compared with the existing gravity concentration technology, the method greatly reduces the retention time, avoids the odor released by anaerobic reaction and the overproof phosphorus in the effluent caused by phosphorus release reaction, and simultaneously reduces the occupied area; compared with the existing mechanical concentration and dissolved air floatation concentration, the method reduces the number of equipment and installed power, and has the advantage of higher energy conservation; compared with the existing rectangular cavitation air flotation thickener, the single machine has larger processing capacity, adjustable reflux ratio, cylindrical equipment as a whole, no dead angle and suitability for the requirements of large-scale sewage treatment plants.
Drawings
FIG. 1 is a schematic process diagram of the present invention;
FIG. 2 is a schematic view of the concentrator of the present invention;
FIG. 3 is a schematic structural view of embodiment 1 of the present invention;
FIG. 4 is a side view of embodiment 1 of the present invention;
fig. 5 is a schematic structural view of embodiment 2 of the present invention.
In the figure: the device comprises a conditioning tank 1, a central feeding pipe 2, a cavitation air flotation concentration tank 3, a central reaction cylinder 4, an adjustable water outlet weir 5, an air flotation head 6, a rotating shaft 7, a side hole 61, micropores 62, a dissolved air branch pipe 63, a central disc 64 and an opening 65.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples in conjunction with the accompanying drawings. It is to be understood that the practice of the invention is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.
Example 1:
an air flotation concentration treatment device for municipal domestic sludge is shown in figure 2 and comprises a sludge conditioning unit for quantitatively adding medicine, mixing and reacting and a cavitation air flotation concentration unit for dissolving air in sludge and completing separation. The sludge conditioning unit is a conditioning tank 1 in the embodiment, the conditioning tank 1 is communicated with the bottom of a cavitation air flotation concentration tank 3 through a central feeding pipe 2, the cavitation air flotation concentration tank 3 is provided with a double-cone bottom, a central reaction cylinder 4 is arranged at the center in the cavitation air flotation concentration tank 3, the middle section of the central reaction cylinder 4 is cylindrical, the upper end and the lower end of the central reaction cylinder 4 are bell mouths, an air flotation head 6 connected with a rotating shaft 7 is arranged at the inner axis of the central reaction cylinder 4, and the air flotation head is positioned at the inner bottom of the central reaction cylinder 4 and is positioned at the lower end bell mouth inlet of the central reaction cylinder 4. The inner wall of the cavitation air flotation concentration tank 3 is provided with an adjustable water outlet weir 5, a sludge groove is arranged between the outer edge of the top of the central reaction cylinder 4 and the inner wall of the cavitation air flotation concentration tank 3, one side of the sludge groove close to the inner wall of the cavitation air flotation concentration tank 3 is provided with a mud guard higher than the liquid level, the mud guard enables the left side and the right side of the sludge groove to be higher and lower, the sludge concentration can be collected conveniently, and clear liquid overflows from the mud guard and flows to the adjustable water outlet weir 5.
As shown in fig. 3 and 4, the air floating head for dissolving air in the cavitation has a top end connected to the hollow rotary shaft 7, and includes six hollow dissolved air branch pipes 63 each having a plurality of micro holes 62 formed on its surface, and a hollow center disk 64 for connecting the rotary shaft and the dissolved air branch pipes. The gas dissolving branch pipe is a linear pipe with a hollow structure, the micropores are arranged on one side of the gas dissolving branch pipe, which deviates from the rotating direction, and the diameter of each micropore is 2 mm. The top of the central disk is provided with an opening 65 which can be matched and connected with the rotating shaft, the inner part of the central disk is a cylinder with a cavity, and six side holes 61 which can be matched and connected with the dissolved gas branch pipe are uniformly distributed on the outer wall of the central disk.
One end of each dissolved air branch pipe is connected with the central disc, the six dissolved air branch pipes are uniformly distributed around the central disc in a radial shape by taking the central disc as a center, each micropore is communicated with the interior of each dissolved air branch pipe, and the dissolved air branch pipes, the central disc and the interior of the hollow rotating shaft are communicated.
When the air floatation head is used, the air floatation head rotates clockwise at a high speed, the dissolved air branch pipe and liquid have a separation tendency in the back surface of the rotation direction to form a low-pressure environment, the pressure at the position is lower than the surrounding liquid and atmospheric pressure, air enters the liquid through the rotation shaft, the central disc, the dissolved air branch pipe and the micropores, and is dispersed into fine bubbles under the stirring action of the high-speed rotation of the dissolved air branch pipe, so that sludge and other solid particles in the wrapped liquid float upwards, and the processes of dissolved air and air floatation separation are realized.
The process schematic diagram of the embodiment is shown in fig. 1, after being conditioned by PAM (polyacrylamide), the municipal domestic sludge enters a cavitation air flotation concentration unit, and air flotation separation is realized through cavitation dissolved air. The water content of the concentrated sludge is less than or equal to 96 percent under different sludge feeding concentrations by adjusting the sludge reflux ratio by utilizing the synergistic action of the effluent weir plate and the central reaction cylinder.
Municipal domestic sludge enters a conditioning tank, PAM is added, stirred and conditioned, and then enters a cavitation air flotation concentration tank 3 through a central feeding pipe under the action of gravity. Efficient even dissolved air is realized through an air flotation head which is specially designed, bubbles wrap sludge particles and quickly float upwards in a central reaction cylinder under the drive of buoyancy and water flow, the sludge particles are diffused to the periphery in the horizontal direction after being decelerated through a diffusion section on the upper part of the central reaction cylinder, the sludge dissolved with the bubbles is separated from water, the sludge is collected and discharged through a sludge groove, separated clear liquid is collected and discharged through an adjustable water outlet weir, partial unseparated sludge enters the reaction cylinder from the central reaction cylinder, and the sludge and newly entering sludge are dissolved with air again to perform air flotation concentration separation.
Specifically, the feeding speed of the central feeding pipe is not more than 1 m/s; the peripheral linear velocity of the air floating head is about 20m/s-40m/s, the air is not easy to be dissolved by too low air, and the too high power consumption is larger; the ascending flow velocity in the central reaction cylinder is about 10mm/s-20 mm/s; through the up-and-down adjustment of the central reaction cylinder and the water outlet weir plate, the reflux ratio can be adjusted between 10 percent and 150 percent, and the requirement of the water content of the concentrated sludge is met.
In the embodiment, when the PAM conditioning dosage is 1.8kg/tDS and the reflux ratio is about 50% for municipal domestic sewage excess sludge with the water content of 99.6%, the water content of the concentrated sludge is 95.5% -95.8%, the consumed power per ton of sludge per hour is about 35W, and the treatment effect is good.
Compared with the existing gravity concentration technology, the method greatly reduces the retention time, avoids the odor released by anaerobic reaction and the overproof phosphorus in the effluent caused by phosphorus release reaction, and simultaneously reduces the occupied area by more than 50 percent; compared with the existing mechanical concentration and dissolved air floatation concentration, the method reduces the number of equipment and installed power, consumes less than or equal to 50w of power per ton of sludge per hour in floatation concentration, and has great energy-saving advantage; compared with the existing cavitation air flotation concentration, the single machine has larger treatment capacity, adjustable reflux ratio and no dead angle due to circular arrangement, and is suitable for the requirements of large-scale sewage treatment plants.
Example 2:
an air flotation concentration treatment device for municipal domestic sludge is the same as that in example 1, except that the air flotation head for cavitation air dissolution is shown in fig. 5, the top end of the air flotation head is connected with a hollow rotating shaft 7, and the air flotation head comprises six hollow air dissolution branch pipes 63 provided with a plurality of micropores 62 on the surface, and a hollow central disc 64 for connecting the rotating shaft and the air dissolution branch pipes. The gas dissolving branch pipe is a curve type pipe with a hollow structure, the micropores are arranged on one side of the gas dissolving branch pipe, which deviates from the rotating direction, and the diameter of each micropore is 5 mm. The top of the central disk is provided with an opening 65 which can be matched and connected with the rotating shaft, the inner part of the central disk is a cylinder with a cavity, and six side holes 61 which can be matched and connected with the dissolved gas branch pipe are uniformly distributed on the outer wall of the central disk.
One end of each dissolved air branch pipe is connected with the central disc, the six dissolved air branch pipes are uniformly distributed around the central disc in a radial shape by taking the central disc as a center, each micropore is communicated with the interior of each dissolved air branch pipe, and the dissolved air branch pipes, the central disc and the interior of the hollow rotating shaft are communicated.
When the air floating head rotates clockwise at a high speed, the rotating speed is generally 1500r/min-3500r/min, the linear velocity of the far end of the dissolved air branch pipe is larger than that of other parts along with the increase of the diameter of the air floating head, and because the pressure difference resistance of liquid and the velocity form a quadratic relation, a large amount of power is consumed on overcoming the pressure difference resistance after the requirement of dissolved air is met. Through the optimal design, the dissolved air branch pipe is a curve type pipe, and under the common rotating speed, after the linear speed required by dissolved air is met, the far-end part of the dissolved air branch pipe deviates from the rotating direction and is bent into a streamline shape, so that the velocity vector perpendicular to the dissolved air branch pipe is reduced, and the pressure difference resistance is greatly reduced. Although the velocity vector of the bent part along the dissolved air branch pipe is objectively increased in the process, the viscous resistance is in direct proportion to the first power of the velocity, and the differential pressure resistance is in direct proportion to the second power of the velocity, in summary, under the condition of the same diameter of the air flotation head, the embodiment 2 can reduce the resistance by more than 20% as optimization, and the resistance reduction effect is further optimized along with the increase of the diameter of the air flotation head, so that the corresponding power consumption is reduced, and the energy-saving effect is good.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The utility model provides a municipal administration domestic sludge air supporting enrichment treatment facility which characterized in that: the equipment comprises a sludge conditioning unit for quantitatively adding, mixing and reacting, and a cavitation air flotation concentration unit for dissolving air in sludge and completing separation; an air floating head used for dissolving air in the cavitation is arranged in the cavitation air floating concentration unit and connected with a hollow rotating shaft, the air floating head comprises a central disc communicated with the rotating shaft and a plurality of air dissolving branch pipes arranged on the side part of the central disc, the air dissolving branch pipes are provided with a plurality of micropores used for ventilating, the top of the central disc is provided with an opening matched and connected with the rotating shaft, the inner part of the central disc is a cylinder with a cavity, and a plurality of side holes matched and connected with the air dissolving branch pipes are uniformly distributed on the outer wall of the central disc;
the cavitation air flotation concentration unit comprises a cavitation air flotation concentration tank, the sludge conditioning unit is communicated with the bottom of the cavitation air flotation concentration tank through a central feeding pipe, a central reaction cylinder is arranged at the center in the cavitation air flotation concentration tank, the middle section of the central reaction cylinder is cylindrical, the upper end and the lower end of the central reaction cylinder are respectively provided with a horn mouth, the air flotation head is arranged at the inner axis of the central reaction cylinder, an adjustable water outlet weir is arranged on the inner wall of the cavitation air flotation concentration tank, and a sludge tank is arranged between the outer edge of the top of the central reaction cylinder and the inner wall of the cavitation air flotation concentration tank;
the air flotation head is positioned at the bottom in the central reaction cylinder and at the inlet of the bell mouth at the lower end of the central reaction cylinder; all the dissolved air branch pipes are radially and uniformly distributed around the central disc by taking the central disc as the center; the gas dissolving branch pipe is a hollow linear pipe or a hollow curve pipe, and the micropores are arranged on one side of the gas dissolving branch pipe, which is far away from the rotating direction;
the diameter of the micropores is 0.1mm-20 mm.
2. The municipal domestic sludge air flotation concentration treatment equipment according to claim 1, characterized in that: the sludge conditioning unit is a conditioning tank, and the cavitation air flotation concentration tank is provided with a biconical bottom.
3. The municipal domestic sludge air flotation concentration treatment equipment according to claim 1, characterized in that: one side of the sludge tank close to the inner wall of the cavitation air flotation concentration tank is provided with a mud guard which is higher than the liquid level, the mud guard enables the left side and the right side of the sludge tank to be higher and lower, the sludge tank is beneficial to collecting concentrated sludge, and clear liquid overflows from the mud guard and flows to the adjustable water outlet weir.
4. The municipal domestic sludge air flotation concentration treatment method adopting the municipal domestic sludge air flotation concentration treatment equipment of claim 1 is characterized by comprising the following steps:
municipal domestic sludge enters a sludge conditioning unit, PAM is added, stirred and conditioned, and then enters a cavitation air flotation concentration tank through a central feeding pipe under the action of gravity; the dosage of PAM is 1.5kg/tDS-2.5 kg/tDS;
in a cavitation air flotation concentration tank, efficient and uniform air dissolution is realized through an air flotation head, bubble-wrapped sludge particles quickly float upwards in a central reaction cylinder under the drive of buoyancy and water flow, the sludge and the water are dispersed towards the periphery in the horizontal direction after being decelerated through a diffusion section at the upper part of the central reaction cylinder, the sludge with dissolved bubbles is separated from the water, the sludge is collected and discharged through a sludge tank, separated clear liquid is collected and discharged through an adjustable water outlet weir, part of unseparated sludge enters the central reaction cylinder along a circulation channel between the central reaction cylinder and the air flotation concentration tank, and the sludge and newly-entered sludge are dissolved with air again for air flotation concentration separation; in the cavitation air flotation concentration tank, the air flotation time is less than or equal to 1min, the separation time is less than or equal to 8min, the reflux ratio is 10-150%, the power consumption per ton of sludge per hour in air flotation concentration is less than or equal to 50w, and the dissolved air amount is more than or equal to 10 mL/L.
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| CN108946989B (en) * | 2018-07-23 | 2021-04-16 | 萍乡市华星环保工程技术有限公司 | Pretreatment device beneficial to coking wastewater treatment |
| CN111204953A (en) * | 2019-04-01 | 2020-05-29 | 麦王环境技术股份有限公司 | Cavitation air flotation equipment for sludge concentration and treatment process |
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| CN112390507A (en) * | 2020-11-13 | 2021-02-23 | 大庆科恩特环保科技发展有限公司 | Deoiling, desanding and dewatering device and method for light oil sludge of oil field |
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