Up-flow AO reactor for biochemical treatment of wastewater

Abstract

The utility model provides an up-flow AO reactor for biochemical treatment of waste water, which comprises a reactor shell, a water inlet pipe, a water outlet pipe, a water inlet pipe and a water outlet pipe, the anoxic zone is located at the lower half part of the cavity, and the anoxic zone is provided with a water inlet, a nitrification liquid reflux inlet, a carbon source feeding port and an emptying port; the aerobic zone is positioned at the upper half part of the cavity and is provided with a water outlet; the water distribution device is located in the anoxic zone and comprises a water distributor and a water distribution pipe, the water inlet end of the water distributor is communicated with the water inlet, the nitrification liquid backflow end of the water distributor is communicated with the nitrification liquid backflow port, the water distribution pipe is located at the bottom of the anoxic zone, and the water distribution pipe is communicated with the water outlet of the water distributor; the aeration device comprises an air blower, an aeration main pipe, an aeration branch pipe and an aeration head, the air blower and the aeration main pipe are both located outside the reactor shell, the aeration head is located in the aerobic zone, and the aeration branch pipe is communicated with the aeration head and the aeration main pipe. The reactor is small in occupied area and good in denitrification effect.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an upflow AO reactor for biochemical treatment of wastewater. Background Technique

[0002] With the rapid development of China's social economy and the continuous improvement of people's living standards, the problem of pollution control has become an issue that must be faced in the process of national economic development. The wastewater discharged in the production and living processes of residents and industrial parks contains nitrogen and phosphorus elements. If this wastewater is discharged into natural water bodies, after some aquatic plants obtain sufficient nutrients, they will reproduce and grow in large numbers, ultimately leading to hypoxia in the water body and the gradual extinction of aquatic organisms. With the increasing improvement of national environmental protection regulations and the increasing strengthening of environmental protection efforts, it is imperative to reduce the total nitrogen pollutant emissions and ensure the stability of the total nitrogen pollutant removal effect.

[0003] At present, for the removal of total nitrogen, the vast majority of domestic wastewater treatment plants adopt the typical A / O biochemical treatment process, and the typical A / O biochemical treatment process is mainly based on steel-concrete structure ponds, that is, the A pond and the O pond are completely separated, that is, both the A steel-concrete pond and the O steel-concrete pond are independent buildings. This not only requires a large floor area, but also it is difficult to ensure the stable denitrification treatment effect. Therefore, how to provide an AO reactor with a small floor area and good denitrification effect is a technical problem to be solved urgently. Content of the Utility Model

[0004] In view of this, the embodiment of the utility model provides an upflow AO reactor for biochemical treatment of wastewater to eliminate or improve one or more defects existing in the prior art.

[0005] One aspect of the utility model provides an upflow AO reactor for biochemical treatment of wastewater, and the reactor includes:

[0006] A reactor housing, having a cavity inside;

[0007] An anoxic zone, located in the lower half of the cavity, the anoxic zone having a water inlet, a nitrification liquid reflux port, a carbon source dosing port, and a drain port;

[0008] An aerobic zone, located in the upper half of the cavity, the aerobic zone having a water outlet;

[0009] A water distribution device, located in the anoxic zone, the water distribution device including a water distributor and a water distribution pipe, the water inlet end of the water distributor is communicated with the water inlet, the nitrification liquid reflux end of the water distributor is communicated with the nitrification liquid reflux port, the water distribution pipe is located at the bottom of the anoxic zone, and the water distribution pipe is communicated with the water outlet of the water distributor;

[0010] An aeration device, comprising a blower, an aeration main pipe, an aeration branch pipe and an aeration head. The blower and the aeration main pipe are both located outside the reactor shell. The aeration head is located in the aerobic zone. The aeration branch pipe connects the aeration head and the aeration main pipe.

[0011] In some embodiments of the present invention, there is a partition between the aerobic zone and the anoxic zone, and there are water passing holes on the partition.

[0012] In some embodiments of the present invention, the water distribution device includes a water distribution pipe support. One end of the water distribution pipe support is connected to the bottom wall of the reactor shell, and the other end of the water distribution pipe support is connected to the water distribution pipe.

[0013] In some embodiments of the present invention, the upflow AO reactor includes a shunt pipe and a nitrification liquid reflux pump. The shunt pipe and the nitrification liquid reflux pump are both located outside the reactor shell. The water inlet end of the shunt pipe is connected to the water outlet of the aerobic zone, and the reflux end of the shunt pipe is connected to the nitrification liquid reflux port of the anoxic zone. The nitrification liquid reflux pump is located on the shunt pipe.

[0014] In some embodiments of the present invention, the upflow AO reactor includes a flow meter, and the flow meter is located between the nitrification liquid reflux pump and the nitrification liquid reflux port of the anoxic zone.

[0015] In some embodiments of the present invention, the shunt pipe has a water outlet end.

[0016] In some embodiments of the present invention, the upflow AO reactor includes a thermal insulation layer, and the thermal insulation layer is located outside the reactor shell.

[0017] In some embodiments of the present invention, the upflow AO reactor includes a heating device, and the heating device is arranged between the reactor shell and the thermal insulation layer.

[0018] In some embodiments of the present invention, the heating device includes a heat conduction pipe, and the heat conduction pipe is laid on the outer side wall of the reactor shell.

[0019] In some embodiments of the present invention, the thermal insulation layer is rock wool or aluminum silicate thermal insulation cotton.

[0020] The upflow AO reactor for wastewater biochemical treatment disclosed in the above embodiments of the present utility model has an anoxic zone and an aerobic zone located in the lower half and the upper half of the inner cavity of the reactor housing respectively, and the reactor is an upflow reactor, that is, the wastewater after denitrification reaction in the A pool slowly enters the O pool above the A pool through the water passing hole between the anoxic zone and the aerobic zone for aerobic reaction; the aerobic zone in the reactor is located above the anoxic zone, thus reducing the floor area. In addition, a water distribution device is provided inside the anoxic zone of the reactor, which enables the reactor to adopt an upflow rotary water distribution method for water distribution, thereby preventing sludge accumulation and ensuring the denitrification effect.

[0021] In addition, the outer shell of the reactor housing of the upflow AO reactor is provided with a heat preservation layer and heat conduction tubes, that is, the wastewater inside the reactor can be heat-preserved in a low-temperature environment, thereby further ensuring stable denitrification and improving the denitrification effect.

[0022] The additional advantages, objects, and features of the present utility model will be partially described below, and will become partially obvious to those of ordinary skill in the art after studying the following text, or can be learned through the practice of the present utility model. The objects and other advantages of the present utility model can be achieved and obtained through the structure specifically pointed out in the specification and the drawings.

[0023] Those skilled in the art will understand that the objects and advantages that can be achieved by the present utility model are not limited to the above specific descriptions, and the above and other objects that the present utility model can achieve will be more clearly understood according to the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present utility model, form a part of this application, and do not limit the present utility model. The components in the drawings are not drawn to scale, but are only for showing the principles of the present utility model. In order to facilitate showing and describing some parts of the present utility model, the corresponding parts in the drawings may be enlarged, that is, may become larger relative to other components in the exemplary device actually manufactured according to the present utility model. In the drawings:

[0025] Figure 1 is a front view of the upflow AO reactor for wastewater biochemical treatment according to an embodiment of the present utility model.

[0026] Figure 2 is Figure 1 a top view of the shown upflow AO reactor.

[0027] Reactor shell 1, main aeration pipe 2, heat conduction pipe 3, heat preservation layer 4, aeration branch pipe 5, shunt pipe 6, nitrification liquid reflux pump 7, flowmeter 8, aeration head 9, water passing hole 10, water inlet pipe 11, nitrification liquid reflux pipe 12, water distributor 13, water distribution pipe 14, water distribution pipe support 15, drain port 16, bottom wall 17 Specific implementation mode

[0028] In order to make the purpose, technical solution and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the implementation mode and the accompanying drawings. Herein, the illustrative implementation mode of the present utility model and its description are used to explain the present utility model, but do not limit the present utility model.

[0029] Herein, it should also be noted that in order to avoid obscuring the present utility model due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present utility model are shown in the drawings, while other details less related to the present utility model are omitted.

[0030] It should be emphasized that the term "including / containing" when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0031] Herein, it should also be noted that the orientation terms such as "left end" and "right end" in the content of this specification are relative to the position direction shown in the drawings; if there is no special description, the term "connection" in this article can not only refer to direct connection, but also represent indirect connection with an intermediate object. Direct connection means that two components are connected without the aid of an intermediate component, and indirect connection means that two components are connected with the aid of other components.

[0032] Hereinafter, embodiments of the present utility model will be described with reference to the drawings. In the drawings, the same reference numerals represent the same or similar components.

[0033] Figure 1 It is a front view of an upflow AO reactor for wastewater biochemical treatment according to an embodiment of the present utility model, as Figure 1 shown, the upflow AO reactor at least includes a reactor shell 1, an anoxic zone, an aerobic zone, a water distribution device and an aeration device.

[0034] There is a cavity inside the reactor shell 1; the anoxic zone is located in the lower half of the cavity, and the anoxic zone has a water inlet, a nitrification liquid return port, a carbon source dosing port, and a drain port 16; the aerobic zone is located in the upper half of the cavity, and the aerobic zone has a water outlet; the water distribution device is located in the anoxic zone, and the water distribution device includes a water distributor 13 and a water distribution pipe 14. The water inlet end of the water distributor 13 is communicated with the water inlet, and the nitrification liquid return end of the water distributor 13 is communicated with the nitrification liquid return port. The water distribution pipe 14 is located at the bottom of the anoxic zone, and the water distribution pipe 14 is communicated with the water outlet of the water distributor 13; the aeration device includes a blower, an aeration main pipe 2, an aeration branch pipe 5, and an aeration head 9. The blower and the aeration main pipe 2 are both located outside the reactor shell 1, the aeration head 9 is located in the aerobic zone, and the aeration branch pipe 5 communicates the aeration head 9 and the aeration main pipe 2.

[0035] In this embodiment, the anoxic zone is the A tank, and the aerobic zone is the O tank, that is, the wastewater undergoes denitrification reaction in the A tank and then slowly enters the upper O tank for aerobic reaction. In addition, there is a partition between the aerobic zone and the anoxic zone, and there are water passing holes 10 on the partition, that is, the wastewater undergoes denitrification reaction in the A tank and then slowly enters the upper O tank for aerobic reaction through the water passing holes 10 on the partition. The aeration device is arranged on the top of the O tank. The aeration device can be a stainless steel liftable microporous aeration device. The aeration device forcibly aerates the O tank through a blower and provides sufficient oxygen for the microorganisms in the tank to facilitate the rapid absorption and degradation of organic matter in the wastewater. In addition, a part of the nitrification liquid effluent after the aerobic biochemical reaction in the O tank flows into the secondary sedimentation tank at the rear end of the reactor through the water outlet of the aerobic zone, and the other part flows back to the A tank through the nitrification liquid return port in the anoxic zone. As Figure 2 shown, the reactor shell 1 can specifically be a cylindrical barrel-shaped structure, and the partition in this embodiment is specifically also a circular plate.

[0036] Specifically, after the wastewater is pretreated at the front end of the sewage treatment plant, it is lifted to the bottom water distributor 13 in the A / O reactor by a lift pump, and is evenly distributed and stirred at a lower upward flow rate in the bottom water distributor 13 to prevent sludge accumulation at the bottom of the A tank. The nitrification return liquid after the treatment in the O tank enters the water distribution device together with the inlet water of the lift pump, and undergoes denitrification reaction by adding the carbon source required for denitrifying bacteria in the A tank, converting the nitrates in the wastewater into nitrogen gas, and discharging it from the reactor with the rising wastewater.

[0037] Exemplarily, the upflow AO reactor includes a shunt pipe 6 and a nitrification liquid reflux pump 7. Both the shunt pipe 6 and the nitrification liquid reflux pump 7 are located outside the reactor housing 1. The water inlet end of the shunt pipe 6 is connected to the water outlet of the aerobic zone, the reflux end of the shunt pipe 6 is connected to the nitrification liquid reflux port of the anoxic zone, and the nitrification liquid reflux pump 7 is located on the shunt pipe 6. In this embodiment, the water inlet end of the shunt pipe 6 is connected to the water outlet of the aerobic zone, that is, the nitrification liquid effluent after the aeration biochemical reaction in the O tank is forced to reflux to the A tank through the nitrification liquid reflux pump 7. In addition, the nitrification liquid reflux port of the anoxic zone is communicated with the nitrification liquid reflux end of the water distributor 13. Therefore, the nitrification liquid effluent after the aeration biochemical reaction in the O tank is forced to reflux to the water distributor 13 in the A tank through the nitrification liquid reflux pump 7. In addition, the shunt pipe 6 also has a water outlet end, which is used to connect to subsequent other treatment equipment, such as a secondary sedimentation tank. In this embodiment, a part of the nitrification liquid effluent after the aeration biochemical reaction in the O tank flows to the secondary sedimentation tank at the back end by gravity through the shunt pipe 6, and the other part is forced to reflux to the water distributor 13 at the bottom of the A tank through the nitrification liquid reflux pump 7.

[0038] Further, the upflow AO reactor includes a flow meter 8, and the flow meter 8 is located between the nitrification liquid reflux pump 7 and the nitrification liquid reflux port of the anoxic zone; in this embodiment, a flow meter 8 is arranged between the nitrification liquid reflux pump 7 and the nitrification liquid reflux port to facilitate the feedback regulation of the nitrification liquid refluxing to the water distributor 13.

[0039] In some embodiments of the present utility model, the water distribution device includes a water distribution pipe support 15. One end of the water distribution pipe support 15 is connected to the bottom wall 17 of the reactor housing 1, and the other end of the water distribution pipe support 15 is connected to the water distribution pipe 14. As Figure 1As shown, the water distribution pipe support 15 is arranged at the bottom of the anoxic zone. During the water inlet and distribution stage, after a series of pre-treatments, the wastewater is lifted from the water inlet of the anoxic zone to the water distributor 13 by a lift pump. A water inlet pipe 11 can be correspondingly arranged between the water distributor 13 and the water inlet of the anoxic zone. At the same time, the nitrified liquid return flow after the reaction in the aerobic zone is also lifted to the water distributor 13 through a nitrified liquid return pump 7 and a nitrified liquid return port. Correspondingly, a nitrified liquid return pipe 12 is arranged between the water distributor 13 and the nitrified liquid return port. After the wastewater inlet and the nitrified liquid return flow are fully mixed in the water distributor 13, they are evenly distributed in the form of a rotating flow state at the bottom of the A pool through the water distribution pipe 14 and slowly rise at a relatively low flow rate. In this reactor, through the stirring action of the rotating flow formed by the water distributor 13 and the water distribution pipe 14, the activated sludge in the A pool can be effectively prevented from depositing at the bottom of the reactor. In addition, when the device is under maintenance, the wastewater in the reactor can be completely discharged through the drain port 16 in the anoxic zone. In addition, during the biochemical reaction stage, the wastewater enters the A pool through the water distribution pipe 14 and is fully mixed with the sludge in the A pool. The A pool (anoxic zone) mainly undergoes anoxic reactions, and the externally supplemented carbon source enters the A pool through the carbon source dosing port. Under anoxic conditions, there are a large number of denitrifying bacteria in the A pool. These bacteria use the carbon source added to the wastewater as an electron donor and the nitrates and nitrites present in the wastewater as electron acceptors to reduce the free nitrates and nitrites to nitrogen gas. As the water flow in the reactor rises, it is discharged into the atmosphere to achieve the removal of total nitrogen in the wastewater. In addition, the water treated by the A pool slowly enters the O pool through the water passing holes 10. The O pool mainly undergoes aerobic reactions. The blower uses the aeration main pipe 2 and the vertically connected liftable aeration branch pipes 5 and aeration heads 9 at the lower part to blow air into the wastewater, which can not only maintain the DO concentration in the O pool and provide a good environment for the growth of aerobic microorganisms, but also achieve the full mixing of the wastewater and the sludge. This embodiment adopts a liftable aeration method, which is convenient for the maintenance and repair of the reactor. And in an aerobic environment, the BOD in the wastewater is absorbed and degraded by microorganisms. Pollutants such as ammonia nitrogen and organic nitrogen are converted into nitrates and nitrites under the action of nitrifying bacteria and nitrite bacteria and are refluxed to the A pool through the nitrified liquid return port communicated with the shunt pipe 6 and the nitrified liquid return pump 7. The flow rate of the nitrified liquid return pump 7 can be feedback-regulated through a flow meter 8. In addition, a part of the wastewater treated by the O pool is also transported to the subsequent treatment facilities through the water outlet end of the shunt pipe 6.

[0040] In some embodiments of the present utility model, the up-flow AO reactor includes a thermal insulation layer 4, and the thermal insulation layer 4 is located outside the reactor housing 1. Since the nitrification rate and denitrification rate of microorganisms are greatly related to temperature, when the temperature is relatively low in winter, the nitrification rate and denitrification rate will decrease, thus affecting the stable operation of the A / O system and causing the total nitrogen in the effluent to not meet the standard. Therefore, in this embodiment, a thermal insulation layer 4 is provided outside the reactor housing 1 to ensure the temperature inside the reactor, thereby ensuring the stable operation of denitrification.

[0041] Furthermore, the up-flow AO reactor includes a heating device, and the heating device is arranged between the reactor housing 1 and the thermal insulation layer 4. The heating device can heat the wastewater in the reactor housing 1. Exemplarily, the heating device includes a heat conduction pipe 3, and the heat conduction pipe 3 is laid on the outer side wall of the reactor housing 1; in this embodiment, the heat conduction pipe 3 is closely attached to the outside of the reactor housing 1, and at the same time, a thermal insulation layer 4 is arranged outside the heat conduction pipe 3. Then, when the temperature is relatively low, a heat medium is input into the heat conduction pipe 3, and heat exchange is carried out between the heat conduction pipe 3 and the wastewater in the reactor housing 1, while the external thermal insulation layer 4 can play a good heat preservation effect and avoid heat dissipation. This structure maintains the temperature of the wastewater in the reactor housing 1, thereby ensuring a stable denitrification effect. Exemplarily, the thermal insulation layer 4 can be rock wool or aluminosilicate insulation cotton, and at this time, the wastewater in the reactor housing 1 is insulated based on the rock wool or aluminosilicate insulation cotton.

[0042] In the above embodiment, the anoxic zone and the aerobic zone are respectively located in the lower half and the upper half of the inner cavity of the reactor housing, and the reactor is an up-flow reactor, that is, the wastewater after denitrification reaction in the A pool slowly enters the O pool above the A pool for aerobic reaction through the water passing hole between the anoxic zone and the aerobic zone; in this reactor, the aerobic zone is located above the anoxic zone, thereby reducing the floor area. In addition, a water distribution device is provided inside the anoxic zone of the reactor, so that the reactor can adopt an up-flow rotary water distribution method for water distribution, thereby preventing sludge accumulation and ensuring the denitrification effect.

[0043] It can be found through the above embodiments that the AO reactor is an integrated reaction device, which can save more floor area compared with the steel-concrete structure in traditional wastewater plants. Therefore, it has the advantages of strong adaptability, small floor area, and stable denitrification effect; the aerobic reaction zone (O pool) at the upper part of the reactor adopts a stainless steel lift microporous aeration device, which can enhance the strength of the aeration pipe and is convenient for later daily maintenance; the anoxic reaction zone (A pool) at the bottom adopts an up-flow rotary water distribution method to ensure uniform mixing of wastewater and sludge and avoid sludge accumulation; in addition, the reactor shell adopts a structure of a heat conduction pipe wrapped with rock wool or aluminosilicate thermal insulation layer, which can play a good heat preservation effect and ensure the stable operation of the reactor.

[0044] In the present utility model, features described and / or illustrated for one embodiment can be used in the same or a similar manner in one or more other embodiments, and / or combined with the features of other embodiments or replace the features of other embodiments.

[0045] The foregoing are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the embodiments of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An upflow AO reactor for biochemical treatment of wastewater, characterized in that, The reactor includes: A reactor housing with a cavity inside. An anoxic zone located in the lower half of the cavity, which has a water inlet, a nitrified liquid return port, a carbon source dosing port, and a drain port. An aerobic zone located in the upper half of the cavity, which has a water outlet. A water distribution device located in the anoxic zone. The water distribution device includes a water distributor and a water distribution pipe. The water inlet end of the water distributor is connected to the water inlet, the nitrified liquid return end of the water distributor is connected to the nitrified liquid return port, the water distribution pipe is located at the bottom of the anoxic zone, and the water distribution pipe is connected to the water outlet of the water distributor. An aeration device including a blower, an aeration main pipe, aeration branch pipes, and aeration nozzles. The blower and the aeration main pipe are both located outside the reactor housing. The aeration nozzles are located in the aerobic zone, and the aeration branch pipes connect the aeration nozzles and the aeration main pipe.

2. The upflow AO reactor for biochemical treatment of wastewater according to claim 1, characterized in that, There is a partition between the aerobic zone and the anoxic zone, and the partition has water passing holes.

3. The upflow AO reactor for biochemical treatment of wastewater according to claim 1, characterized in that, The water distribution device includes a water distribution pipe support. One end of the water distribution pipe support is connected to the bottom wall of the reactor housing, and the other end of the water distribution pipe support is connected to the water distribution pipe.

4. The upflow AO reactor for biochemical treatment of wastewater according to claim 1, characterized in that, The upflow AO reactor includes a diversion pipe and a nitrified liquid return pump. The diversion pipe and the nitrified liquid return pump are both located outside the reactor housing. The water inlet end of the diversion pipe is connected to the water outlet of the aerobic zone, the return end of the diversion pipe is connected to the nitrified liquid return port of the anoxic zone, and the nitrified liquid return pump is located on the diversion pipe.

5. The upflow AO reactor for biochemical treatment of wastewater according to claim 4, characterized in that, The upflow AO reactor includes a flow meter, and the flow meter is located between the nitrified liquid return pump and the nitrified liquid return port of the anoxic zone.

6. The upflow AO reactor for biochemical treatment of wastewater according to claim 4, characterized in that, The diversion pipe has a water outlet end.

7. The upflow AO reactor for biochemical treatment of wastewater according to any one of claims 1 to 6, characterized in that, The upflow AO reactor includes a heat preservation layer, and the heat preservation layer is located outside the reactor housing.

8. The upflow AO reactor for biochemical treatment of wastewater according to claim 7, characterized in that, The upflow AO reactor includes a heating device, and the heating device is arranged between the reactor housing and the heat preservation layer.

9. The upflow AO reactor for biochemical treatment of wastewater according to claim 8, characterized in that, The heating device includes a heat conduction pipe, and the heat conduction pipe is laid on the outer side wall of the reactor housing.

10. The upflow AO reactor for biochemical treatment of wastewater according to claim 7, characterized in that, The heat preservation layer is rock wool or aluminosilicate heat preservation cotton.

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