CN113233621A - Surface aeration method and equipment based on silk thread shearing sewage - Google Patents
Surface aeration method and equipment based on silk thread shearing sewage Download PDFInfo
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- CN113233621A CN113233621A CN202110562615.3A CN202110562615A CN113233621A CN 113233621 A CN113233621 A CN 113233621A CN 202110562615 A CN202110562615 A CN 202110562615A CN 113233621 A CN113233621 A CN 113233621A
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- 238000005273 aeration Methods 0.000 title claims abstract description 135
- 239000010865 sewage Substances 0.000 title claims abstract description 67
- 238000010008 shearing Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 96
- 239000002184 metal Substances 0.000 claims abstract description 37
- 239000000835 fiber Substances 0.000 claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 229910000639 Spring steel Inorganic materials 0.000 claims description 30
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 6
- 238000005276 aerator Methods 0.000 description 11
- 239000007788 liquid Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000003756 stirring Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241001415846 Procellariidae Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003911 water pollution 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
- C02F7/00—Aeration of stretches of water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention relates to a surface aeration method and equipment based on silk thread shearing sewage, which comprises the steps of adopting a large number of thin silk threads to cut the sewage at a high speed within a certain depth range on the sewage surface, realizing sufficient air-water mixing, dissolving oxygen in the air into the water to achieve the effect of high-efficiency aeration, and simultaneously assisting certain flow guide measures to ensure that certain water flow exchange is carried out between an aeration area and a non-aeration area, thereby achieving the purposes of low energy consumption and high power efficiency. The invention adopts the metal wire or fiber wire high-speed shearing sewage as the aeration method, can overcome the defects of the existing aeration equipment, and achieves the technical aim of obviously improving the surface aeration power efficiency, the aeration method has high power efficiency, simpler equipment and no worry of blockage, and the actual power efficiency can generally reach 3.0-3.5 kgO2More than kW.h, which is obviously superior to the prior traditional surface aeration equipment.
Description
Technical Field
The invention belongs to the field of water pollution treatment technology and equipment, and particularly relates to a surface aeration method and equipment based on silk thread shearing sewage.
Background
The aerobic biological treatment process of sewage needs to provide aeration for the sewage so as to meet the requirement of microorganism growth. Aeration is usually a part of sewage plant with the largest energy consumption, and the improvement of aeration efficiency and energy consumption saving have very important significance for sewage plants. The traditional aeration method mainly adopts air blower aeration, mechanical surface aeration or jet aeration.
The blower provides air to the water through the blower, and the air is further dispersed into bubbles with certain sizes into the water through the diffusion device. In general, since the gas-liquid contact area has a large influence on the oxygen mass transfer, the smaller the bubble diameter of the blower aeration, the higher the power efficiency of the aeration. However, when the air bubbles are particularly small, on one hand, the air entering the blower needs to be dedusted, and the operation cost is increased; on the other hand, the running resistance is greatly increased, the energy consumption is also increased, and the maintenance workload is also increased.
The common equipment for mechanical surface aeration is an aeration rotary brush or a rotary disk, and the sewage is violently stirred at the water surface by using a machine, so that an air-water mixture is formed, and the aeration effect is achieved. The equipment is located the surface of water, and it is convenient to overhaul, and does not have the jam problem. However, the defects are that the rotating brush or the rotating disc adopts a very limited area (the area is too large to drive the water flow, so the energy consumption is too large), the shearing contact area is limited, the water flow speed is high in the stirring process, the power energy of the water flow is almost lost, the power efficiency cannot be increased, the efficiency is reduced, and the power efficiency is difficult to further improve.
The jet aeration utilizes high-speed water flow to drive air to run in a pipeline, and because the Reynolds number is extremely high, the air and the water are fully mixed, and the diameter of the aerated bubbles is very small. However, the jet aeration requires a large flow rate, consumes a large amount of energy, causes severe equipment abrasion, and is relatively rarely applied as an aeration method.
The theoretical power efficiency of various aeration devices is specified, and HJ/T263-2006 specifies that the jet flow aeration is equal to or more than 2.0kgO2kW.h; JB T10670-2014 specifies that the inverted umbrella type surface aerator should>2.0kgO2kW.h, the parameters provided by the plant enterprise, can generally be reached in the optimum case>2.1kgO2kW.h; GBT35183-2017 stipulates that the surface aeration of the pump impeller should be more than or equal to 1.9kgO2kW.h; the microporous aerator in the HJ/T252-2006 specification is not less than 4.0-5.0 kgO according to different materials2/kW·h。
Obviously, the efficiency of the medium-micropore aerator in the aeration method of the blower is high, the theoretical power efficiency is almost more than 2 times that of other methods, but the method needs the medium-micropore diffuser, the medium-micropore diffuser is easily blocked under water, the efficiency is inevitably reduced after the operation for a period of time, and the actual power efficiency can only be maintained at 2.0-2.5 kgO generally2about/kW.h, and the processThe workload of maintenance is large, and the cost of equipment and pipeline engineering is also high. Although the surface aeration is free from blockage, the equipment is positioned on the water surface, the equipment is simple and convenient to overhaul, and the power efficiency is not reduced along with the operation of the equipment, the power efficiency is difficult to further improve as known from the above, and the prior art cannot overcome the defect, so that the technical aim of remarkably improving the power efficiency of the surface aeration is achieved.
Disclosure of Invention
The invention aims to provide an aeration method by adopting high-speed shearing sewage of metal wires (or fiber wires) aiming at the technical defects of the existing surface aeration equipment, which can overcome the defects of the existing aeration equipment and achieve the technical aim of obviously improving the power efficiency of surface aeration. Reasonable equipment structure and arrangement mode are adopted, the optimal operation parameters are achieved, and the actual power efficiency can reach 2.5-3.0 kgO2More than kW.h, at least 20 to 33 percent higher than that of the existing surface aeration method, and the effect is very obvious. The method belongs to surface aeration, does not cause the phenomenon of power efficiency reduction along with the prolonging of the operation time of equipment, has no worry of blockage, has simple equipment structure and low manufacturing cost, and is obviously superior to the power efficiency of the existing various aeration methods and equipment.
The invention realizes the purpose through the following technical scheme:
a surface aeration method based on silk thread shearing sewage includes such steps as rotationally cutting sewage by a great number of silk threads at medium-or high-speed in a certain depth range on sewage surface to fully mix air with water, dissolving oxygen in air in water to obtain aeration effect, and using guide measure to exchange water flow between aeration area and non-aeration area for low energy consumption and high power efficiency.
Preferably, the flow guide measures are as follows: and (3) diffusing the sewage in the aeration area to the peripheral area as soon as possible by adopting a flow impeller or a blower, or maintaining the sewage in the aeration area to have a certain horizontal flow velocity/circumferential flow velocity.
Preferably, the running linear speed of the silk threads during shearing is the most critical factor influencing the aeration power efficiency, the high speed is generally adopted, the shearing linear speed (or the edge average linear speed) of the silk threads in water is not lower than 9-12 m/s, and the specific optimal value is based on the parameters obtained by a field sewage experiment.
A surface aeration device based on silk thread shearing sewage comprises a power shaft and silk threads, wherein the power shaft directly/indirectly drives the silk threads to rotate to cut the sewage under the driving of a motor. The oxygen supply amount of the single-group aeration equipment is not too large due to the consideration of the diffusion of the oxygen-enriched water after the aeration. When the power shaft is transversely arranged, the motor power of the single-group aeration equipment is preferably within 20 kW; when the power shaft is longitudinally arranged, the motor power of the single-group aeration equipment is preferably within 15 kW. When the oxygen demand of the aeration tank is large, a plurality of devices can be adopted. If the aeration tank has enough water flow speed, namely the oxygen-enriched water after aeration diffuses fast to the periphery or in one direction, the motor power of the single-group aeration equipment is not limited. The motor power of a single device is not suitable to be less than 3kW due to the consideration of the motor efficiency.
Preferably, the silk threads can be arranged in a cross mode, namely, the silk threads are arranged in a transverse, vertical or oblique mode, the silk threads can also be arranged in a net shape, and the mesh pores can be rectangular, polygonal and the like. The silk threads can be matched with different specifications and thicknesses, namely silk threads with different diameters are adopted, and the thick and thin silk threads are arranged in a staggered mode. The distance between the front row and the back row of the filament is controlled to be a proper value in the running direction of the filament, and the distance between the front row and the back row is usually 0.010-0.025 s, i.e. the linear distance is 0.010-0.025 s multiplied by the edge linear speed of the filament.
Preferably, when one end of the wire is fixed, the wire must have certain tensile and compressive strength and yield strength, and a metal wire can be generally adopted, wherein the metal wire comprises a spring steel wire or other high-strength metal, and the diameter of the wire is 0.5-1.5 mm; when the two ends of the silk thread are connected and fixed, the silk thread only needs to have certain tensile strength, a fiber silk thread or a metal silk thread can be adopted, the silk thread needs to be wear-resistant and corrosion-resistant, and the diameter of the silk thread is 0.2-0.5 mm.
When the arrangement mode and the arrangement density of the power silk threads have great influence on the aeration power efficiency, the silk threads need to be arranged on the water surface within a certain submerging depth range, so that the proper silk thread arrangement mode is adopted according to the position of a power shaft:
preferably, the metal wire is a spring steel wire.
Preferably, the power shaft is arranged in parallel with the water surface, the metal wires are perpendicular to the center of the power shaft and perpendicular to the water surface, the metal wires rotate to shear the water surface and are uniformly distributed in a radial shape, the arrangement mode is similar to that of a traditional aeration rotary brush, and the shearing track of each wire is a circular disc.
Preferably, the power shaft is arranged perpendicular to the water surface, the metal wires are arranged on the outer ring of the power shaft, the metal wires are distributed in parallel to the water surface, the lengths of the upper metal wires and the lower metal wires are equal or gradually reduced, and the arrangement mode is similar to that of a traditional inverted umbrella aerator; if the upper layer of silk threads are long and the lower layer of silk threads are short, a cylindrical barrel can be arranged at a certain distance outside the axis, the silk threads are fixed on the barrel, and the shearing track of each silk thread is also a disc; the silk thread can also be directly fixed on the power shaft.
Preferably, the metal wire is arranged on a cross rod, a power shaft drives the metal wire to rotate through the cross rod, the cross rod is arranged parallel to the water surface, the metal wire is perpendicular to the water surface, and the shearing track of the metal wire is a cylindrical surface.
Preferably, the fiber thread is arranged in substantially the same manner as the metal thread except that a metal link is attached to the outside of the fiber thread to maintain the tension thereof.
Arrangement density of the filaments:
if the silk threads are arranged too densely, the effect similar to flat aeration is caused; if the arrangement is sparse, each silk thread is not connected with other silk threads, and the gas-water disturbance is insufficient in the aeration process. Generally, the gap distance between the parallel wires is preferably 20-40 mm, and the faster the linear speed, the larger the distance, and vice versa. The larger the wire diameter, the larger the gap distance and vice versa. Or the area of the upstream surface of the silk thread accounts for 0.5-2.0% of the area of the whole air-water stirring shearing section, and the value is taken when the diameter of the silk thread is smaller.
The characteristic parameters of the silk thread are as follows:
the width or diameter of the silk thread has great influence on the power efficiency, if the width or diameter of the silk thread is too large, the movement of the silk thread is similar to that of an aeration rotating brush or a reverse umbrella aerator, the water flow driving force is strong, the power of a motor is large, the kinetic energy obtained by the water flow is huge, but the shearing contact area of air water is insufficient, the speed difference at the air-water interface is small, the thickness of a liquid film is large, and the improvement of the aeration power efficiency is not facilitated. However, if the width or diameter of the wire is too small, the wire cannot form a low pressure zone after the wire is in-line even if the wire is used for shearing sewage rapidly, the solid-liquid shearing speed difference is large, and the aeration efficiency is not high due to lack of gas-liquid contact. The width of the thread needs to be selected by considering the thread shearing speed, the viscosity of the sewage and the like, and the viscosity of the sewage at normal temperature can be simply considered as a constant (related to the temperature), so the shearing speed is mainly considered. Generally, a high shear rate allows a smaller wire width or diameter. Therefore, the proper width or diameter of the silk thread needs to be selected according to the sewage property and the equipment operation parameters, for general sewage or clean water, the width or diameter of the silk thread can be about 0.5-1.5 mm when one end is fixed, and the diameter is about 0.2-0.5 mm when both ends are fixed. Particularly fast rotational speeds or fiber threads, lower widths or diameters can be used.
The cross section shape of the silk thread is as follows:
the cross-sectional shape of the wire is generally circular, because circular materials are the least expensive when the same stress conditions are met. However, considering that the aeration area and the non-aeration area need to exchange water (otherwise, the aeration area has too high oxygen concentration, which also causes efficiency reduction), the shapes of the sections of the metal wires can be optimized to be rhombus, blade shape, arc shape, oblong shape and the like, and the sections of the metal wires are asymmetric along the running direction so as to provide a certain directional flow velocity for sewage during aeration. The cross-sectional shape of the non-metallic wire is generally not considered.
Depending on the equipment configuration and size, the depth of submersion (submersion) of the wire in the water depends on the size of the equipment, and the greater the power of the equipment (the greater the stirring radius), the greater the submersion depth. The whole aeration equipment is only provided with silk threads in the underwater part as much as possible so as to reduce unnecessary energy consumption; however, for fiber threads under water, a metal rod must be used as a tension configuration device, the metal rod should be made of a high-strength material as much as possible, and the cross-sectional area in the water flow running direction is reduced to reduce the resistance. The underwater submerging depth of the silk thread is proper, if the submerging depth is too small, the aeration power efficiency is high, but the total aeration capacity of a single device is small, namely the standard oxygenation capacity is small, the number of devices required during large-scale aeration is too large, and the cost of the devices is too high; if the submergence depth is too large, it is difficult to obtain effective air-water shearing when shearing the filaments at a deep depth under water, and the efficiency is also reduced. In general, the submerging depth of the wires in the water is about 0.10-0.25 m, and the submerging depth can be further increased for the equipment with optimized structure.
The aeration conditions of the sewage sheared by the silk threads are greatly different, on one hand, the shearing speed can be obviously improved under the same power because the area of the water-facing section is very small when the silk threads are sheared; on the other hand, the speed difference of shearing gas and water is increased under the condition of cutting the silk thread, the thickness of a liquid film is reduced, and the aeration power efficiency is improved. During the shearing process of the silk thread, a remarkable gas-water two-phase mixture is formed, and the resistance loss of the mixture is remarkably reduced. In a two-phase gas-liquid flow, the resistance loss is smaller than that in the liquid phase, and the pressure drop thereof includes four parts, namely, a gravity pressure drop, a friction pressure drop, an acceleration pressure drop and a local resistance pressure drop. And when the silk thread is sheared, the acceleration rate obtained by the water flow is small, namely although the water is sheared at high speed by air and water, the water does not obtain large acceleration, and the energy consumption is small. Based on the factors, the energy consumption is obviously reduced and the power efficiency is far higher than that of the traditional aeration method under the condition of the same aeration amount by adopting the silk thread shearing aeration.
In addition, when the shearing speed is higher, because the silk yarns form a thin air film layer after the silk yarns shear water flow quickly, on one hand, the air-water contact area is greatly increased relative to that of an inverted umbrella aerator (compared under the condition of the same upstream area, namely the projection areas of the silk yarns in the shearing direction are the same); on the other hand, the liquid film thickness is obviously thinned by fast shearing, and the two aspects can increase the mass transfer efficiency of gas and water compared with the traditional aeration methods such as inverted umbrella and the like.
Therefore, by adopting the silk threads instead of the metal plates (or metal sheets and the like) as the surface aeration mode, the thickness of the liquid film is reduced under the condition of reducing power consumption, and the contact area of gas and water is increased, which are beneficial to improving the mass transfer efficiency of the liquid film, so that the power efficiency is obviously improved.
The invention has the beneficial effects that:
1) the invention adopts the metal wire or fiber wire high-speed shearing sewage as the aeration method, can overcome the defects of the existing aeration equipment, achieves the technical aim of obviously improving the surface aeration power efficiency, adopts reasonable equipment structure and arrangement mode, achieves the optimal operation parameters, and has the actual power efficiency of 2.5-3.0 kgO2More than kW.h, which is at least improved by more than 20-33% compared with the existing surface aeration method, and the effect is very obvious;
2) the invention belongs to surface aeration, does not have the phenomenon of power efficiency reduction along with the prolonging of the operation time of equipment, has no worry of blockage, has simple equipment structure and low manufacturing cost, and is obviously superior to the power efficiency of the prior various aeration methods and equipment.
Drawings
FIG. 1 is a schematic view of an aeration apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic view of an aeration apparatus according to a second embodiment of the present invention;
FIG. 3 is a schematic view of an aeration apparatus according to a third embodiment of the present invention;
FIG. 4 is a schematic view of an aeration apparatus according to a fourth embodiment of the present invention;
FIG. 5 is a schematic view of an aeration apparatus according to a fifth embodiment of the present invention;
FIG. 6 is a schematic view of an aeration apparatus according to a sixth embodiment of the present invention;
FIG. 7 is a schematic view of an aeration apparatus according to a seventh embodiment of the present invention;
in the figure: 1. a power shaft; 2. a spring steel wire; 3. a fiber yarn; 4. a cylinder; 5. a steel bar; 6. a circular ring; 7. a waterborne crossbar; 8. an underwater crossbar.
Detailed Description
The embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that the embodiments described herein are merely illustrative and explanatory of the present invention, and are not restrictive of the flow, configuration, parameters, etc. of the process and apparatus of the present invention; the specific parameters given in the embodiments are merely examples for illustrating the present invention, and are not necessarily parameters. The embodiment is only used for illustrating the arrangement form and the specific operation effect of the surface aeration method and the equipment based on the silk thread rapid cutting sewage. The apparatus and method may be adapted to a variety of situations in practice.
During the surface aeration process, on one hand, the air water needs to maintain enough shear velocity difference to reduce the thickness of a liquid film, and on the other hand, the air water needs to have enough shear contact area. In the traditional aeration method, a reverse umbrella surface aerator (or a rotary brush rotary disc and the like) rotates at a high speed to push water flow to rotate selectively on the surface of a pool and lift a part of sewage into the air, so that the air and water are mixed. However, the impeller of the inverted umbrella surface aerator can only adopt a very limited area (the energy consumption for pushing water flow is too large due to too large area), the shearing contact area is limited, the water flow speed is high in the stirring process, and the power energy of the water flow is almost lost. Usually, the maximum edge linear speed of the inverted umbrella aerator can only be maintained at 5-6 m/s, and the increase of the shearing speed leads to the great increase of the required power, so that the power efficiency cannot be increased, and the efficiency is possibly reduced. The same problem is also encountered with rotary brushes or rotary disk aerators, which makes it difficult to further increase their power efficiency.
In order to improve the power efficiency of surface aeration, the invention provides a surface aeration method based on silk thread shearing sewage, which comprises the steps of adopting a large number of silk threads to cut the sewage in a certain depth range on the sewage surface at a medium-high speed in a rotating mode, enabling the air and the water to be fully mixed, dissolving oxygen in the air into the water to achieve an aeration effect, and simultaneously assisting a diversion measure to enable an aeration area and a non-aeration area to have certain water flow exchange, so that the purposes of low energy consumption and high power efficiency are achieved.
The shearing linear velocity (or edge average linear velocity) of the silk thread in water is not lower than 9-12 m/s, and the specific optimal value is based on the parameters obtained by a field sewage experiment.
The flow guide measures are as follows: the sewage in the aeration area is diffused to the peripheral area as soon as possible, or the sewage in the aeration area is maintained to have a certain horizontal flow velocity/circumferential flow velocity.
In order to realize the aeration method, the invention also provides surface aeration equipment for shearing sewage based on the silk threads, which comprises a power shaft 1 and the silk threads, wherein the power shaft 1 directly/indirectly drives the silk threads to rotate and cut the sewage under the driving of a motor. Depending on the equipment configuration and size, the depth of submersion (submersion) of the wire in the water depends on the size of the equipment, and the greater the power of the equipment (the greater the stirring radius), the greater the submersion depth.
The first implementation mode comprises the following steps: the power shaft is transversely arranged, namely the spring steel wire is cut, and the figure 1 shows.
Arrange horizontal power shaft 1 about 0.2m above aeration tank pool face water level, power shaft 1 effective length equals the aeration tank width, a plurality of thin spring steel wires 2 of vertical welding (or with spring steel wire 2 welding on connecting in power shaft 1's drum 4) on the power shaft 1, spring steel wire 2 length 0.25 ~ 0.45m, submerge the depth of water 0.05 ~ 0.25m deeply (neglecting power shaft 1 diameter), can weld 6 ~ 10 rows of spring steel wire 2 (getting the even number) on the power shaft 1, each row of spring steel wire 2 and the stagger position of adjacent row of spring steel wire 2, the odd number row of spring steel wire 2 aligns on power shaft 1 direction of rotation promptly, even number row also aligns. But the spring wires 2 of the odd rows are located at the middle of the previous row (or the next row). The underwater part of the aeration equipment is only provided with the spring steel wire 2.
During aeration, sewage obtains a certain horizontal directional plug flow effect along with the rotation of the power shaft 1, but the plug flow speed is far lower than that of the traditional rotating brush. Therefore, the aeration mode is suitable for an oxidation ditch process, or a flow impeller is required to be added near aeration equipment to diffuse sewage.
In a simulated pilot experiment, a 40W motor is adopted, the average submerging depth of 3 spring steel wires 2 is 15mm, aeration is carried out in a circular sewage tank with the volume of 300L for 15.0s, the average dissolved oxygen value of the sewage tank is increased from 1.26mg/L to 2.70mg/L, and the actual increase of the dissolved oxygen is 0.432gO2The energy consumed by the motor is 1.667 multiplied by 10-4kW.h, actual power efficiency of 2.592kgO2kW.h, however, the efficiency of the micro motor is considered to be low (less than 75%), and if a high-efficiency motor is used (efficiency)>90%), the actual power efficiency may reach 3.11kgO2kW.h. Parameter optimization is not carried out in the laboratory bench tests, and if the parameters are optimized, the predicted power efficiency can be improved to 3.3-3.5 kgO2More than kW.h.
The second embodiment: the power shaft 1 is arranged transversely-the fibre thread 3 is cut, see fig. 2.
The other steps are the same as the first embodiment except that a steel bar 5 is arranged at the tail end of the fiber wire 3, the tail end of the steel bar 5 is welded on the power shaft 1, and the fiber wire 3 is fixed on the steel bar 5. The underwater part of the aeration equipment is provided with steel bars 5 besides the fiber wires 3.
The third embodiment is as follows: the power shaft 1 is vertically arranged in a first mode, namely a spring steel wire 2 is cut, and the figure 3 shows.
The motor is arranged at a certain position above the surface of the aeration tank, the power shaft 1 is vertical to the water surface, the tail end of the power shaft 1 is provided with a circular ring 6, the center of the circular ring 6 is connected to the power shaft 1, when the power shaft 1 rotates, the circular ring 6 rotates, and the circular ring 6 is provided with a plurality of holes so as to ensure the transverse flow of water. The ring 6 just submerges in the water, and the height of the ring 6 is the submerging depth. The diameter of the circular ring 6 is determined according to the shape of the aeration tank. Spring steel wire 2 is arranged in 6 outsides of ring, and spring steel wire 2 is on a parallel with the surface of water, and 2 length 0.15 ~ 0.30m of spring steel wire, when the motor opened, 6 rotations of ring drive spring steel wire 2 rotatory and shear sewage. Similar to a reverse umbrella aerator, the spring steel wires 2 push the sewage outwards when shearing the sewage, so that the sewage is diffused outwards under the action of centrifugal force, the pressure at the center is reduced, and the sewage at the bottom of the center of the circular ring 6 is supplemented to form vertical annular flow. When the aeration equipment runs, because the power obtained by sewage is small and the radius of vertical annular flow is too small, the air aeration of the traditional blower is matched with the use party to maintain high power efficiency. In the vicinity of the water bottom at the vertical projection position of the circular ring, an air diffusion device is needed for aeration, medium and small air bubbles are generally adopted, and the air flow rate is not required to be too large so as to maintain that sewage can form annular flow at the position. The underwater part of the aeration equipment is provided with a spring steel wire 2 and a circular ring 6, and the spring steel wire 2 and the circular ring 6 are all positioned underwater.
The fourth embodiment: the power shaft 1 is arranged vertically-the fibre thread 3 is cut, see figure 4.
The other steps are the same as the third embodiment, except that the end of the fiber wire 3 outside the ring is provided with a steel bar 5, the end of the steel bar 5 is welded on the ring 6, and the fiber wire 3 is fixed on the steel bar 5. The underwater part of the aeration equipment is a fiber thread 3, a circular ring 6 and a steel bar 5, and all the three parts are positioned underwater.
The fifth embodiment: and the power shaft 1 is vertically arranged in a second mode, namely the spring steel wire 2 is sheared, and the figure 5 shows.
The motor is located above the water surface, the power shaft 1 is perpendicular to the water surface, the tail end of the power shaft 1 is immersed under water, the spring steel wire 2 is directly welded on the power shaft 1, and the spring steel wire 2 is parallel to the water surface. The greater the depth of submersion, the shorter the length of the spring wire 2.
Embodiment six: and the power shaft 1 is vertically arranged in a third mode, namely the spring steel wire 2 is sheared, and the figure 6 shows.
The motor is arranged at a certain position above the surface of the aeration tank, the power shaft 1 is vertical to the water surface, the tail end of the power shaft 1 is provided with an overwater cross rod 7, and the overwater cross rod 7 is slightly higher than the water surface and is parallel to the water surface. A large number of spring steel wires 2 are vertically arranged downwards on the water cross rod 7, and one part of each spring steel wire 2 is submerged in water to a depth of 0.15-0.25 m. The spring steel wire 2 is arranged at the position of the water cross bar 7, which is only close to the two ends within a certain range, and the other positions are blank. When the motor rotates, the overwater cross rod 7 is driven to rotate, and the spring steel wire 2 positioned below the overwater cross rod 7 rotates and shears sewage.
Embodiment seven: the power shaft 1 is arranged vertically three-the fiber thread 3 is cut, see figure 7.
The other parts are the same as the sixth embodiment, except that the tail end of the fiber silk thread 3 is provided with an underwater cross rod 8, namely a metal connecting rod, the tail end of the underwater cross rod 8 is welded on an overwater cross rod 7 (namely the overwater cross rod 7 of the sixth embodiment), and one end of the fiber silk thread 3 is fixed on the overwater cross rod 7 with one end fixed on the underwater cross rod 8. The underwater part of the aeration device is the fiber silk thread 3 and the underwater cross bar 8, the underwater cross bar 8 is completely positioned underwater, and the fiber silk thread 3 is only partially positioned underwater.
The foregoing embodiments have shown and described only the basic principles and essential features of the invention and its advantages. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, and that various changes and modifications, including oblique arrangement of the filaments, irregular shape of the cut regions, etc., may be made without departing from the spirit and scope of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A surface aeration method based on silk thread shearing sewage is characterized in that: the method comprises the steps of cutting sewage on the surface of the sewage in a rotating mode by adopting silk threads to fully mix air and water, dissolving oxygen in the air into the water to realize aeration, and simultaneously assisting with a diversion measure to enable water flow exchange between an aeration area and a non-aeration area.
2. The surface aeration method based on silk thread shearing sewage as claimed in claim 1, characterized in that: the shearing linear speed of the silk thread in water is not lower than 9-12 m/s.
3. The surface aeration method based on silk thread shearing sewage as claimed in claim 1, characterized in that: the flow guide measures are as follows: the sewage in the aeration area is diffused to the peripheral area, or the horizontal flow velocity/annular flow velocity of the sewage in the aeration area is maintained.
4. The utility model provides a surface aeration equipment based on sewage is cuted to silk thread which characterized in that: the sewage cutting machine comprises a power shaft and a silk thread, wherein the power shaft drives the silk thread to rotate to cut sewage under the driving of a motor.
5. The surface aeration device based on silk thread shearing sewage water of claim 4, characterized in that: when one end of the silk thread is fixed, the silk thread is a metal silk thread, and the diameter of the silk thread is 0.5-1.5 mm; when the two ends of the silk thread are connected and fixed, the silk thread is a fiber silk thread or a metal silk thread, and the diameter of the silk thread is 0.2-0.5 mm.
6. The surface aeration method and device based on silk thread shearing sewage as claimed in claim 5, characterized in that: the metal wire is made of spring steel wires.
7. The surface aeration device based on silk thread shearing sewage water of claim 5, characterized in that: the power shaft is arranged in parallel with the water surface, and the metal wire is perpendicular to the center of the power shaft.
8. The surface aeration device based on silk thread shearing sewage water of claim 5, characterized in that: the power shaft is perpendicular to the water surface, the metal wires are arranged on the outer ring of the power shaft, and the metal wires are distributed in parallel to the water surface.
9. The surface aeration device based on silk thread shearing sewage water of claim 5, characterized in that: the metal wire is arranged on the cross rod, the power shaft drives the metal wire to rotate through the cross rod, the cross rod is arranged in parallel to the water surface, and the metal wire is perpendicular to the water surface.
10. A surface aeration apparatus based on wire shearing sewage water according to any one of claims 7 to 9, wherein: and a metal connecting rod is connected to the outer side of the fiber silk thread to maintain the tensile force of the fiber silk thread.
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| CN202110562615.3A CN113233621A (en) | 2021-05-24 | 2021-05-24 | Surface aeration method and equipment based on silk thread shearing sewage |
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