CN108516615B - Oxidation ditch adopting pump type impeller surface aerator - Google Patents

Oxidation ditch adopting pump type impeller surface aerator Download PDF

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CN108516615B
CN108516615B CN201810353348.7A CN201810353348A CN108516615B CN 108516615 B CN108516615 B CN 108516615B CN 201810353348 A CN201810353348 A CN 201810353348A CN 108516615 B CN108516615 B CN 108516615B
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oxidation ditch
flow guide
type impeller
aerator
surface aerator
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CN108516615A (en
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唐玉朝
薛莉娉
伍昌年
潘法康
申慧彦
唐义
王坤
黄健
李卫华
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Anhui Jianzhu University
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1257—Oxidation ditches
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/14—Activated sludge processes using surface aeration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • 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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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses an oxidation ditch adopting a pump type impeller surface aerator, which comprises galleries and partition walls, wherein the partition walls are walls shared by adjacent galleries, the oxidation ditch also comprises a flow guide channel, the flow guide channel is provided with an upward circular water outlet hole, the oxidation ditch also comprises a vertically placed pump type impeller aerator which is arranged above the water outlet hole, and the pump type impeller aerator belongs to the surface aerator and comprises a motor and an impeller connected with the output end of the motor. The invention can obviously improve the power efficiency of aeration on the premise of basically unchanging the original performance of the oxidation ditch, avoids the waste of electric energy caused by additionally arranging a plug flow device, adopts a pump type impeller aerator with better energy efficiency and has relatively lower operation and maintenance cost.

Description

Oxidation ditch adopting pump type impeller surface aerator
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to an oxidation ditch adopting a pump type impeller surface aerator.
Background
The oxidation ditch process is one of the most widely applied processes for treating the urban sewage at present, and the process can efficiently realize the functions of denitrification, dephosphorization, BOD removal and the like. For example, the common Carrousel oxidation ditch process adopts a multi-gallery arrangement mode, sewage circulates in galleries, and the process has the advantages of excellent water quality of effluent of a plug flow reactor and stable operation of a complete mixing reactor, and is widely applied.
The aeration equipment is the key equipment in an oxidation ditch process sewage treatment plant and is also high-energy consumption equipment in a sewage treatment process, and the Carrousel oxidation ditch aeration energy consumption can even account for more than 50-60% of the energy consumption of the whole sewage treatment plant, so that the cost of sewage treatment is reduced, and the key point is that the aeration equipment is selected and is in a high-efficiency state. The high-efficiency and low-consumption aeration equipment is selected to improve the aeration oxygenation capacity, and more importantly, the energy can be saved and the cost of sewage treatment can be reduced. The aeration device applied to the Carrousel oxidation ditch at present mainly comprises a flat-plate impeller surface aerator, an inverted umbrella impeller surface aerator, an aeration rotary brush, an aeration rotary disc and blast aeration. The power efficiency and energy efficiency ratio of various aeration modes are shown in the table.
Aeration apparatus List (Unit kgO)2/kWh)
Figure GDA0001845140690000021
In common aeration equipment, a blower (micropore) has the highest power efficiency and energy efficiency ratio, but the blower micropore aeration needs to be provided with a blower, an air pipeline, a diffuser and other equipment, and in order to obtain high efficiency, the aperture of the diffuser needs to be very small (micron scale), the number of the diffusers is large, the resistance is large, and the diffuser is positioned at the bottom of a pool, so that the maintenance is inconvenient. Calcium and magnesium scale in sewage is easy to block micropores, the elasticity of the diaphragm type aeration head is weakened (a diffuser made of rigid materials is easy to block, and air purification measures are often needed), along with the accumulation of dirt blocking, the resistance is gradually increased, and the theoretical power efficiency and the energy efficiency ratio are reduced year by year.
The surface aeration device is relatively simple and is positioned in the pool, the maintenance is convenient, but the aeration power efficiency of the surface aeration device is low, and the theoretical maximum power efficiency of the horizontal axis surface aeration machine (rotary brush, rotary disc) is generally not more than 2.0kgO2The maximum effective water depth of the rotary brushing surface aerator is not more than 3.50 meters, the rotary disc surface aerator is made of nonmetal, triangular wedge-shaped lugs of the rotary brushing surface aerator are easily abraded when the rotary brushing surface aerator works in a mud-water mixed medium, the aeration performance is also attenuated year by year, and the power efficiency is gradually reduced. And vertical axis surface aerator (plate impeller, pump impeller)Inverted umbrella impeller) is higher than that of a horizontal shaft surface aerator, and the theoretical maximum power efficiency of a flat plate impeller surface aerator can reach 2.70kgO2The theoretical maximum power efficiency of pump type impeller surface aeration equipment reaches 2.90kgO2More than kWh and better sewage-lifting effect. However, the vertical axis surface aerator radiates water to the periphery during aeration, has a weak directional propulsion effect and has an obvious short flow phenomenon, so that the power efficiency is low. In order to overcome the influence of short flow, the depth and the shape of the pool are generally required, namely, the depth of the pool is shallow and the shape of the pool is circular, so that circulation flow is formed in the whole pool during aeration.
When the aeration is carried out by adopting the vertical axis surface aerator, the reaction tank cannot be made into a round shape and the depth of the reaction tank is made shallow, so that the reduction of the aeration efficiency cannot be avoided. In order to improve the effect as much as possible, the conventional oxidation ditch process arranges a vertical axis surface aerator at the turning part of an oxidation ditch gallery, so that a certain directional plug flow effect can be obtained while aeration is carried out, and the efficiency is as high as possible. Even so, since the water flow forms a turbulent flow in the aeration zone at the time of aeration, the oxygen supply is very uneven, which leads to a decrease in efficiency. Moreover, the directional plug flow effect of this arrangement is general, and a plurality of underwater propellers are still required to maintain the flow velocity in the oxidation ditch, which increases the energy consumption. The improvement of the aeration efficiency of the vertical axis surface aerator in the oxidation ditch process has important significance for energy conservation and consumption reduction.
Disclosure of Invention
In order to solve the problems, save energy and improve efficiency, the invention provides an oxidation ditch scheme adopting pump type impeller surface aeration equipment, which is realized by adopting the following technical scheme:
the utility model provides an adopt pump type impeller table to expose machine's oxidation ditch, includes corridor and partition wall, the partition wall is the wall of adjacent corridor sharing, still includes the water conservancy diversion passageway, be equipped with an ascending circular shape apopore on the water conservancy diversion passageway, still include a vertical pump type impeller table of placing that is equipped with above the apopore exposes machine, pump type impeller table exposes machine includes the motor, the impeller of being connected with the motor output. The core principle of the invention is that a pump type impeller aerator absorbs water from a flow guide channel to form a directional plug flow effect, thereby avoiding the waste of electric energy caused by additionally arranging plug flow equipment. As long as the guide channel forms the only communication part of two separated spaces, the flow pushing effect can be obtained.
The improved structure is characterized in that the flow guide channel is a flow guide pipe, the lower part of the partition wall is provided with an opening, the opening is connected with the flow guide pipe to form a water inlet hole, and the other side of the flow guide pipe is provided with a circular water outlet hole with an upward direction and is below the water level line.
Furthermore, the arrangement position of the open hole is in the middle position of the horizontal direction of the partition wall, and the draft tube penetrates through the partition wall to guide water from the gallery on the other side of the surface aerator, so that the short-flow phenomenon of the vertical shaft surface aerator is completely avoided, and the utilization rate of oxygen can be improved
Or the flow guide channel is a flow guide plate arranged in a straight line section of the gallery, the flow guide plate cuts off the whole gallery, and an upward circular water outlet hole is arranged below a water level line and is the only water flow channel of the flow guide plate.
The further improvement is that the diameter of the impeller is 2000-3000 mm.
The further improvement lies in that the diameter of the flow guide pipe is 4000mm, and the diameter of the circular water outlet hole is 4000 mm. For the present invention, a larger diameter impeller is required because a surface aerator is required to provide the water flow power of the whole oxidation ditch, and the flow guide channel is slightly larger than the diameter of the impeller to reduce the running resistance.
On the basis of maintaining the integral process of the oxidation ditch not to be obviously changed relative to the Carrousel oxidation ditch, the invention adopts the pump type impeller surface aerator for aeration, and simultaneously improves the position of the surface aerator and guides water flow to flow according to the set direction, thereby improving the power efficiency of the surface aerator and realizing energy conservation and consumption reduction.
If the actual DO concentration value at the outflow of the aerator on the Carrousel oxidation ditch surface is considered according to 2.5mg/L (generally, the DO concentration of an aerobic section is required to be controlled not to be lower than 2.0mg/L), and the DO concentration at the tail end of an anoxic section is taken as<0.5mg/L, and the saturated DO concentration in the sewage at normal temperature is calculated as 8.0 mg/L. The average DO concentration of the aeration area in the traditional surface aerator arrangement mode is 2.25mg/L (namely (2+2.5)/2 is 2.25 ═ 2.25]The average DO concentration of the aeration area of the arrangement mode of the invention is 1.50mg/L (namely, (0.5+2.5)/2 is 1.5 ═ 1.5]It is theoretically possible to improve the power efficiency by more than 13% (i.e., (8-1.5)/(8-2.25) ═ 1.13) simply by overcoming the short flow in this manner]. If the lower DO concentration of the anoxic zone is controlled (for example, the DO concentration at the tail end of the anoxic zone is controlled to be 0.2mg/L) in order to improve the nitrogen and phosphorus removal efficiency, the power efficiency can be theoretically improved by 15.7 percent, and the energy-saving effect is very obvious. If the actual saturated DO concentration of the sewage at normal temperature is considered to hardly reach 8.0mg/L, the actual energy-saving effect is higher. The maximum theoretical power efficiency of the pump type impeller aerator is 2.9kgO2Calculated by/kWh, the maximum theoretical power efficiency after improvement can reach 3.5kgO2above/kWh, almost close to the blower micro-aeration mode.
In addition, by adopting the arrangement of the mode, a very clear flow pushing effect can be obtained while aeration is carried out, the impeller of the pump type impeller surface aerator is consistent with the working principle of the impeller of the centrifugal pump, water is guided to enter from the drainage tube during rotation, and water flow is circulated between the gallery outside the partition wall and the gallery where the surface aerator is located through aeration (or the water flow is guided by the guide plate to realize directional flow in the gallery). After the arrangement in the mode, all water absorbed by the surface aerator comes from the outer side gallery (or the other side of the guide plate) of the partition wall, continuous circulation flow is formed by water flow, the capacity of forcibly pushing the water flow to flow along the annular gallery is achieved, the possibility of short flow does not exist in the water flow, the arrangement quantity and the arrangement power of the underwater propellers can be saved, the underwater propellers can be even saved, and the energy-saving effect is further achieved. If the mixed power of the anoxic zone in the traditional process is 3W/m3Design (standard specified value is 2-8W/m3The actual value is mostly 3-5W/m3Here the calculation is considered as low), the invention reduces 1/2, and can further save 10% of energy consumption (aeration area power is according to 15W/m)3Calculated and specified in the specification), the energy-saving effect is very obvious. If the underwater propeller is omitted during operation, the energy saving can reach 20%. Therefore, compared with the Carrousel oxidation ditch of the traditional inverted umbrella surface aerator (the process arrangement mode that the inverted umbrella surface aerator is positioned at the bend), the invention controls the condition that the operation parameters are not changedIn theory, the total energy saving reaches 23% -35.7%, the average value is calculated to reach 29.3%, and the energy saving effect is very obvious.
Drawings
FIG. 1 is a schematic diagram of a pump impeller surface aerator 7 according to an embodiment of the present invention
FIG. 2 is a schematic structural diagram of embodiment 1 of the present invention
FIG. 3 is a schematic plan view showing the constitution of example 1 of the present invention
FIG. 4 is a schematic plan view showing the constitution of example 2 of the present invention
FIG. 5 is a schematic view of the peripheral structure of the surface aerator in accordance with embodiment 3 of the present invention
FIG. 6 is a schematic view of the peripheral structure of the surface aerator in accordance with embodiment 4 of the present invention
FIG. 7 is a schematic view of the overall structure of embodiments 3 to 4 of the present invention
FIG. 8 is a cross-sectional view of a flow guide tube in embodiment 4 of the present invention
The device comprises a partition wall 1, a gallery 2, a flow guide channel 5, a flow guide pipe 51, a hole 52, a flow guide plate 53, a water outlet 6, a pump-type impeller surface aerator 7, a motor 71 and an impeller 72.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Example 1: with reference to fig. 2 and 3, an oxidation ditch adopting a pump-type impeller surface aerator is provided, wherein the oxidation ditch takes a two-gallery Carrousel oxidation ditch as an example and comprises a gallery 2 and a partition wall 1, the partition wall is a wall shared by adjacent galleries 2 and further comprises a flow guide channel 5, the flow guide channel is provided with an upward circular water outlet 6, the oxidation ditch further comprises a vertically-placed pump-type impeller surface aerator 7 arranged above the water outlet, and the pump-type impeller surface aerator comprises a motor 71 and an impeller 72 connected with the output end of the motor. The diversion channel 5 is a diversion pipe 51, the lower part of the partition wall is provided with an opening 52, the opening 52 is connected with the diversion pipe 51 to form a water inlet, and the other side of the diversion pipe 51 is provided with a round water outlet 6 with an upward direction and a height below the water level line. The position of the opening 52 is located at the middle position of the partition wall 1 in the horizontal direction. The diameter of the impeller 72 is 2000-3000 mm. The diameter of the flow guide pipe 51 is 4000mm, and the diameter of the circular water outlet 6 is 4000 mm. Water is sucked into the draft tube 51 from the low region, aerated and sprinkled on the high region under the action of the impeller 72, and flows to the low region along the gallery to complete the circulation.
When the pump type table exposes machine during operation, because the effect of centrifugal force, the table exposes machine center department pressure reduction, and the sewage in the partition wall outside flows in through the drainage tube of heavy-calibre under the effect of gravity, and along with the continuous rotation of pump type impeller, rivers continuously export, and the theory of operation is unanimous with the centrifugal pump. Because a certain flow velocity needs to be controlled in the oxidation ditch, the width of the oxidation ditch gallery is 6.0m, the depth of the oxidation ditch is 6.0m, and the flow velocity of the oxidation ditch is 0.25m/s, which is taken as the design basis, the flow of the two galleries is 18.0m in total3The diameter of the drainage tube is 4.0m, the average flow velocity in the drainage pipeline with large caliber is 1.43m/s, and the drainage tube is very short (about 6 m), so the head loss is very small. The diameter of an impeller of the surface aerator is 2500mm, and the rotating speed and the average annihilation depth of the impeller can be determined according to the parameters required by equipment installation. The distance between the bottom of the impeller of the surface aerator and the vertical direction of the flow guide pipe needs to be adjusted according to field installation, and parameters are controlled by the flow velocity in the flow guide pipe during adjustment<Preferably 1.5 m/s.
The length of the straight line part of the two gallery oxidation ditches can be 50-80 m, the gallery width is calculated by 6.0m, the length of the turning part is 18.8m (calculated by a central line), the total length of the two galleries is 118.8-178.8 m, and the volume of the aeration tank is 4276-6437 m3If the total Hydraulic Retention Time (HRT) of the anoxic zone and the aerobic zone is 8.0h, the daily treated sewage amount is 1.28-1.93 ten thousand meters3. The length of the specific corridor can be determined according to the sewage oxygen demand, the length of the corridor is short when the oxygen demand is large, the length of the corridor can be longer when the oxygen demand is small, and the corridor can be determined by combining plant area plane layout.
Considering that sewage needs to remove both BOD and denitrification and dephosphorization, according to the water quality parameters of municipal sewage, the oxygen demand per cubic meter of sewage is generally designed to be 0.20-kg, the oxygen demand of the embodiment is 2560-3860 kg/d, the oxygen demand converted into hour is 107-161 kg/h, and the diameter is calculated according to the water quality parameters of the municipal sewageThe oxygen supply capacity of the 2500mm pump (E) type impeller is calculated under the standard state as follows: qs 0.379 × 4.52.8×2.51.88143kg/h (to explain that the aeration machine absorbs water at a low DO concentration by improving the arrangement, so the pool shape structure correction coefficient K is changed1K21) in consideration of the reduction of the oxygen supply capacity in the actual sewage, the requirement of the oxygen demand can be completely met according to the factor of 0.80, and the adjustment of the oxygen demand can be realized by controlling the rotating speed of the impeller. The motor power required to be configured is 0.0804 multiplied by 4.53.0×2.52.0849.3 kW. The saved propeller power is 12.8-19.3 kW, the average value is 16.0kW, and the energy of the flow pushing part can be saved by 32%. Theoretical power efficiency reaches 2.90kgO2The actual power efficiency reaches 2.32kgO in kWh2The water treatment method has the advantages of good effect in kWh, and is obviously higher than that of the traditional aeration mode.
In the embodiment, the section of the flow guide pipe is circular, the section is approximately L-shaped, the diameter is about 4000mm, and the flow in the flow guide pipe needs to meet the sum of the flows of galleries on two sides. The inflow part of the water flow of the draft tube is transverse (in the horizontal direction), the outflow part of the draft tube is vertical upwards, and the central position of the tube is right on the axis of the surface aerator. When the flow guide pipe flows in, in order to reduce resistance, the inlet is made into a horn mouth and is made into an arc shape along the water flow direction. When entering the lower part of the surface aerator, the flow guide pipe needs to convert the water flow from the horizontal direction to the vertical direction, and the flow guide pipe needs to be made into an arc shape at the position, so that the water flow resistance is reduced. The flow velocity in the guide pipe is not suitable to be too large, otherwise, the vortex is formed to increase the energy consumption, and the lower the flow velocity in the guide pipe is, the better the flow velocity is. However, the flow rate in the guide pipe needs to be enough, the depth of the oxidation ditch gallery is not suitable to be too large, the diameter of the surface aerator impeller is not suitable to be too large, the diameter of the guide pipe is about 4000mm, and the calculated flow speed in the guide pipe is suitable to be below 1.5 m/s. If the energy consumption is further reduced and the flow velocity in the diversion pipe is reduced, the aperture of the inlet of the diversion pipe can be properly enlarged, and the elevation of the pipe bottom is slightly lower than the elevation of the pool bottom according to the consideration.
Example 2: with reference to fig. 4, in this embodiment, based on embodiment 1, a four-gallery Carrousel oxidation ditch is changed, and a surface aerator is still disposed at the middle position of the partition wall and located outside the partition wall, as in embodiment 1.
The arrangement mode of the four galleries is the same as the arrangement mode of the two galleries in action principle, the pressure at the center of the surface aerator is reduced when the surface aerator works, and sewage on the outer side of the partition wall flows in through the large-caliber drainage tube under the action of gravity. The difference is that the surface aerator is positioned at the outer side, namely on the gallery of the large ring, so that when sewage flows back to the guide pipe, the direction of water flow is consistent with the direction of flow guide, the phenomenon of circuitous and tortuous water flow is avoided, and the resistance of water flow is reduced. The diameter of an impeller of a surface aerator is still about 2000-3000mm in the arrangement mode of the four galleries, and the rotating speed and the average annihilation depth of the impeller can be determined according to parameters required by equipment installation. The distance between the bottom of the impeller of the surface aerator and the vertical direction of the flow guide pipe needs to be adjusted according to field installation, and the flow velocity in the flow guide pipe is preferably less than 1.5m/s by controlling parameters during adjustment.
The length of a straight line part of the four-gallery oxidation ditch can be 40-55 m, the width of the gallery is calculated by 6.0m, and the depth is calculated by 6.0 m. Length of turning part: the single ring of the small ring is 9.4m (calculated by the central line), the large ring is 28.3m, the total length of the four galleries is 216.6 to 276.6m, and the volume of the aeration tank is 7798 to 9958m3If the total Hydraulic Retention Time (HRT) of the anoxic zone and the aerobic zone is calculated by 8.0h, the daily treated sewage amount is 2.34-2.99 km3. The length of the specific corridor can be determined according to the sewage oxygen demand, the length of the corridor is short when the oxygen demand is large, the length of the corridor can be longer when the oxygen demand is small, and the corridor can be determined by combining plant area plane layout. And a four-gallery arrangement mode is adopted, so that the whole arrangement of the oxidation ditch is compact.
Similarly, the oxygen demand per cubic meter of sewage is designed to be 0.20-5980 kg/d, the oxygen demand in the embodiment is 4680-5980 kg/d, the oxygen demand converted into the hour is 195-249 kg/h, and the oxygen supply capacity is calculated by a pump (E) type impeller with the diameter of 3000mm under the standard state: qs 0.379 × 5.02.8×3.01.88271kg/h (stating: by improving the arrangement, the cell structure correction factor K is equal to1K2All can take 1) in consideration of the decrease of oxygen supply capacity in actual sewageThe minimum oxygen supply capacity is 203kg/h according to the factor of 0.75, the requirement of the oxygen demand can be completely met, the adjustment of the oxygen demand can be realized by controlling the rotating speed of the impeller to a certain extent, but for the oxidation ditch of the four galleries, the diameter of the impeller of the surface aerator is larger, the rotating speed also reaches a higher value, and the impeller is not suitable to be increased. The motor power required to be configured is 0.0804 multiplied by 53.0×32.0898.7kW, the power of the propeller saved is 23.4 kW-29.9 kW, the average value is 26.6kW, and the energy can be saved by 27% in the flow pushing part. Theoretical power efficiency reaches 2.74kgO2The actual power efficiency reaches 2.19kgO2The power efficiency is slightly reduced compared with the two galleries in the/kWh, but is still obviously higher than the aeration power efficiency of the oxidation ditch in the traditional arrangement mode.
Example 3: combine fig. 5 and fig. 7, an adopt oxidation ditch of pump type impeller table machine of exposing a sea, including corridor 2 and partition wall 1, the partition wall is the wall of adjacent corridor 2 sharing, still includes water conservancy diversion passageway 5, be equipped with an ascending circular shape apopore 6 on the water conservancy diversion passageway, still include a vertical pump type impeller table that places that the apopore top was equipped with exposes a sea machine 7, pump type impeller table exposes a sea machine and includes motor 71, the impeller 72 of being connected with the motor output. The flow guide channel 5 is a flow guide plate 53 arranged in a straight line section of the gallery 2, the flow guide plate 53 cuts off the whole gallery 2, and an upward circular water outlet 6 is arranged below a water level line and is the only water flow channel of the flow guide plate 53. The diameter of the impeller 72 is 2000-3000 mm. The diameter of the flow guide pipe 51 is 4000mm, and the diameter of the circular water outlet 6 is 4000 mm.
The guide plate 53 is formed by splicing three rectangular plates and is Z-shaped, after the whole gallery 2 is cut off, the gallery is divided into a low-level area and a high-level area, and the impeller sucks water out of the water outlet hole 6 and sprays the water to the high-level area to complete aeration and flow pushing work. When the impeller of the surface aerator works, water is absorbed from the hole, the guide plate is arranged to ensure that all water absorbed by the surface aerator is upstream water, the DO concentration of the water is lower, and the efficiency of the surface aerator is improved.
Example 4: with reference to fig. 6 and 7, the present embodiment is different from embodiment 3 in that the flow guiding plate 53 is an inclined flow guiding plate, and the other embodiments are the same as embodiment 3 in main functions and advantages, and waste of aeration resources is prevented by isolating the low-level region from the high-level region to prevent short flow of water.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (4)

1. The utility model provides an adopt oxidation ditch of pump type impeller table machine of exposing to sun, includes corridor (2) and partition wall (1), the partition wall is the wall of adjacent corridor (2) sharing, its characterized in that: the aerator also comprises a flow guide channel (5), wherein an upward circular water outlet hole (6) is formed in the flow guide channel, and a vertically placed pump-type impeller surface aerator (7) is arranged above the water outlet hole and comprises a motor (71) and an impeller (72) connected with the output end of the motor;
the diversion channel (5) is a diversion pipe (51), the lower part of the partition wall is provided with an opening (52), the opening (52) is connected with the diversion pipe (51) to form a water inlet, and the other side of the diversion pipe (51) is provided with an upward circular water outlet (6) with the height below the water level;
the arrangement position of the opening (52) is in the middle position of the horizontal direction of the partition wall (1).
2. The oxidation ditch using a pump-type impeller surface aerator as claimed in claim 1, wherein: the flow guide channel (5) is a flow guide plate (53) arranged in a straight line section of the gallery (2), the flow guide plate (53) cuts off the whole gallery (2), an upward circular water outlet hole (6) is arranged below a water level line, and the flow guide channel is the only water flow channel of the flow guide plate (53).
3. An oxidation ditch using a pump-type impeller surface aerator as claimed in claim 1 or 2, wherein: the diameter of the impeller (72) is 2000-3000 mm.
4. The oxidation ditch using a pump-type impeller surface aerator as claimed in claim 1, wherein: the diameter of the flow guide pipe (51) is 4000mm, and the diameter of the circular water outlet hole (6) is 4000 mm.
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CN101172705A (en) * 2007-09-21 2008-05-07 中国科学技术大学 High-efficiency oxidation ditch biological sewage treatment method and system
CN101618925B (en) * 2009-07-27 2011-08-03 北京汉青天朗水处理科技有限公司 Sewage treatment device

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Publication number Priority date Publication date Assignee Title
CN101172705A (en) * 2007-09-21 2008-05-07 中国科学技术大学 High-efficiency oxidation ditch biological sewage treatment method and system
CN101618925B (en) * 2009-07-27 2011-08-03 北京汉青天朗水处理科技有限公司 Sewage treatment device

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