Liftable aeration system and reaction tank for a reaction tank containing suspended biological carriers

Abstract

The embodiment of the present invention relates to the field of sewage treatment equipment, and provides a liftable aeration system and a reaction tank for a reaction tank containing a suspended biological carrier. The liftable aeration system includes an annular air supply pipe, an aerator, an air inlet pipe and a drain pipe. The aerator is installed on the annular air supply pipe and connected to the annular air supply pipe. The aerator is laid in the reaction tank through the annular air supply pipe. The bottom of the air inlet pipe and the bottom of the drain pipe are both connected to the annular air supply pipe. The top of the air inlet pipe and the top of the drain pipe are respectively detachably installed at the pool mouth of the reaction tank. A lifting rope is installed on the annular air supply pipe and a counterweight is configured. The liftable aeration system provided by the embodiment of the present invention does not need to install any mechanical moving parts in the reaction tank, and there are no relatively moving parts during the lifting and lowering process. It is not disturbed by the sewage sludge mixture and the suspended biological carrier during lifting or lowering, so it can be repaired at any time as needed, and there is no need to reduce production and drain water during maintenance, thereby reducing operating costs.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment equipment, and in particular to a liftable aeration system and a reaction tank for a reaction tank containing suspended biological carriers. Background Art

[0002] The activated sludge method is a method of biological treatment of sewage. Its treatment process is: under artificial conditions, various microbial groups that have been pretreated or initially precipitated in sewage are continuously mixed and cultured to form suspended activated sludge. The biological action of activated sludge is used to decompose and remove organic pollutants in sewage, and then the sludge is separated from the water. Most of the sludge is returned to the biological reactor, and the rest of the sludge is discharged from the activated sludge system. The activated sludge system must ensure that there is a certain amount of dissolved oxygen in the water, and the aeration device and aeration tank are the main devices and buildings for aerobic treatment of sewage. Among them, the aeration device continuously injects air into the sewage to dissolve the oxygen in the air in the water.

[0003] In order to facilitate the maintenance of various aeration heads fixed to the bottom of the pool, the current common practice is to make the aeration device liftable. Traditional liftable aeration devices, such as vertical lift microporous aerators, consist of four parts: multiple tubular aeration heads arranged on the annular air distribution pipe, lifting rails and underwater coupling devices, and two mobile manual hoists. When the aeration head in the aeration tank needs to be repaired, unbolt the air drop pipe bolts, and use the two mobile manual hoists on both sides of the annular pipe to be repaired in the aeration tank to pull the stainless steel wire rope, and evenly lift the annular air distribution pipe along the lifting rail to the water surface, and then manually paddle the rubber raft or put a springboard on the annular pipe to replace the aeration head.

[0004] The suspended biological carrier process, namely the moving-bed biofilm reactor (MBBR) and the fluidized biological carrier (FBC) process optimized and evolved on the basis of MBBR, both integrate the characteristics of the suspended growth biofilm method and have developed into a simple, stable, flexible and compact sewage treatment process. Suspended filler processes of different configurations have been successfully used for carbonization, nitrification and denitrification, and can meet different effluent water quality standards including strict nitrogen and phosphorus removal requirements. They are suitable for the treatment of high-concentration organic wastewater and urban domestic sewage in chemical, slaughtering, food processing, pharmaceutical, biological fermentation, textile printing and dyeing, and the construction and upgrading of existing urban sewage treatment plants and industrial sewage treatment plants. The MBBR / FBC reaction tank uses specially designed biofilm fillers, which provide the oxygen required for growth through the bubbles generated by the aerator and the activated sludge and biofilm in the system, and generate disturbances to suspend the fillers in the reaction tank.

[0005] The traditional liftable aeration device must be equipped with lifting rails when lifting, and most of the lifting rails are located underwater. Lifting or lowering depends on the pulley to move up and down. There are a large number of suspended biological carriers in the MBBR / FBC reaction tank. The suspended biological carriers are made of HDPE or other materials and are easily stuck between the pulley block and the rail, resulting in the aeration device being unable to rise or fall smoothly, and also destroying the suspended biological carriers in the reaction tank. Summary of the invention

[0006] The object of the present invention is to provide a liftable aeration system and a reaction tank for a reaction tank containing a suspended biological carrier, so as to solve the problem that the existing liftable aeration device is easy to get stuck on the suspended biological carrier, thereby interfering with the lifting operation and destroying the suspended biological carrier.

[0007] In order to solve the above technical problems, the present invention provides a liftable aeration system for a reaction pool containing suspended biological carriers, comprising an annular air supply pipe, an aerator, an air inlet pipe and a drain pipe, wherein the aerator is installed on the annular air supply pipe and communicated with the annular air supply pipe, the aerator is laid in the reaction pool through the annular air supply pipe, the bottom of the air inlet pipe and the bottom of the drain pipe are both connected to the annular air supply pipe, the top of the air inlet pipe and the top of the drain pipe are respectively detachably installed at the pool mouth of the reaction pool, and a lifting rope is installed on the annular air supply pipe and is provided with a counterweight.

[0008] Wherein, the aerator is a combination of any one or more of a membrane slat aerator, a diaphragm aerator and a rotary mixing aerator.

[0009] Wherein, the air inlet pipe and the drain pipe are arranged at two ends of the annular air supply pipe opposite to each other.

[0010] There are two drainage pipes, and the two drainage pipes are arranged at intervals on the same side of the annular air supply pipe.

[0011] Among them, the air inlet pipe and the drainage pipe both extend along the depth direction of the reaction pool, one end of the air inlet pipe is connected to the gas delivery pipe through a connecting elbow, a gas supply valve is installed on the gas delivery pipe, and a drainage valve is installed on the top of the drainage pipe.

[0012] Among them, it also includes a bracket installed at the bottom of the reaction tank.

[0013] The annular air supply pipe is fixedly provided with a plurality of lifting ears, a fixing piece is installed at the pool mouth of the reaction pool, one end of the lifting rope is fixedly connected to the lifting ear, and the other end of the lifting rope is fixed to the fixing piece.

[0014] There are four counterweight blocks, which are evenly distributed on the annular air supply pipe.

[0015] It also includes a movable traction device, which is used to pull the lifting rope to achieve the lifting of the aerator.

[0016] An embodiment of the present invention further provides a reaction tank, comprising the liftable aeration system as described above.

[0017] The present invention provides a liftable aeration system and a reaction pool for a reaction pool containing suspended biological carriers, wherein the air inlet pipe and the drain pipe are respectively connected to the annular air supply pipe, and the tops of the two are installed at the pool mouth of the reaction pool, so that the annular air supply pipe can be installed in the reaction pool with the help of the air inlet pipe and the drain pipe, and no other fixed parts are required to be arranged in the reaction pool; the configured counterweight block can prevent the annular air supply pipe and the aerator from generating huge buoyancy to affect the stability of the system operation; when lifting is required, the air inlet pipe and the drain pipe are removed from the pool mouth of the reaction pool, and the aerator can be pulled out from the bottom of the reaction pool with the help of an external traction device or manually pulling the lifting rope. Compared with the traditional liftable aeration system, the liftable aeration system for a reaction pool containing suspended biological carriers provided by the present invention does not need to install any mechanical moving parts in the reaction pool, and there are no relatively moving parts during the lifting and lowering process, and it is not disturbed by the sewage sludge mixture and the suspended biological carrier during lifting or lowering, so it can be repaired at any time according to needs, and there is no need to reduce production and release water during maintenance, thereby reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the use state of the liftable aeration system for a reaction pool including a suspended biological carrier according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the connection structure between the annular air supply pipe and the aerator.

[0021] In the figure: 100, suspended biological carrier; 1, reaction tank; 2, annular air supply pipe; 3, aerator; 4, air inlet pipe; 5, drainage pipe; 6, lifting rope; 7, counterweight block; 8, adapter elbow; 9, gas delivery pipe; 10, air supply valve; 11, drainage valve; 12, bracket; 13, lifting ear; 14, traction device. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "first" and "second" are for the purpose of clearly describing the numbering of product components and do not represent any substantial difference. The directions of "up", "down", "left" and "right" are all based on the directions shown in the accompanying drawings. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Figure 1 FIG. 1 is a schematic diagram of the structure of a liftable aeration system for a reaction pool containing suspended biological carriers according to an embodiment of the present invention. Figure 1 As shown, the liftable aeration system includes an annular air supply pipe 2, an aerator 3, an air inlet pipe 4 and a drain pipe 5. The aerator 3 is connected to the annular air supply pipe 2 after being installed on the annular air supply pipe 2, and the aerator 3 is laid at the bottom of the reaction tank 1 through the annular air supply pipe 2. The bottoms of the air inlet pipe 4 and the drain pipe 5 are both connected to the annular air supply pipe 2, and the tops of both can be detachably installed at the pool mouth of the reaction tank 1. A lifting rope 6 is installed on the annular air supply pipe 2 and a counterweight 7 is configured. According to the different structures of the aerator 3, a branch pipe connected to the annular air supply pipe 2 can also be arranged horizontally or vertically in the annular air supply pipe 2, and multiple aerators 3 are arranged on the branch pipe to supply air to the reaction tank 1. The aerator 3 and the annular air supply pipe 2 or the branch pipe are connected by threaded connection, welding or adhesive connection.

[0026] The present invention provides a liftable aeration system for a reaction pool containing suspended biological carriers, wherein the air inlet pipe 4 and the drain pipe 5 are respectively connected to the annular air supply pipe 2, and the tops of the two are installed at the pool mouth of the reaction pool 1, thereby the annular air supply pipe 2 can be installed in the reaction pool 1 with the help of the air inlet pipe 4 and the drain pipe 5, and no other fixed components are required to be arranged in the reaction pool 1. In addition, since there are no coupling devices and other fixed components in the liftable aeration system, a counterweight block 7 needs to be configured to prevent the annular air supply pipe 2 from generating huge buoyancy to affect the stability of the system operation. When lifting is required, the air inlet pipe 4 and the drain pipe 5 are removed from the pool mouth of the reaction pool 1, and the aerator 3 can be pulled out from the bottom of the reaction pool 1 with the help of an external traction device or by manually pulling the lifting rope 6. Compared with the traditional liftable aeration system, the liftable aeration system for the reaction tank containing suspended biological carriers provided by the present invention does not need to install any mechanical moving parts in the reaction tank 1, and there are no relatively moving parts during the lifting and lowering process. It is not disturbed by the sewage sludge mixture and the suspended biological carriers 100 during lifting or lowering, so it can be repaired at any time as needed, without reducing production and draining water during maintenance, thereby reducing operating costs.

[0027] In an embodiment of the present invention, the aerator 3 can be any one of a membrane slat aerator, a diaphragm aerator and a rotary mixing aerator. The annular air supply pipe 2 sets up a framework for installing multiple aerators 3 and provides gas flow inside. Traditional corundum or ceramic aerators are prone to scaling at the pores, which leads to a sharp increase in pressure loss after the aerator 3 starts to operate. At this time, acid needs to be added to the aeration pipe for cleaning. In many aeration systems, it needs to be added once every 12 hours. The aerator 3 provided in the embodiment of the present invention has a relatively simple structure. Taking the membrane microporous aerator as an example, there is a supporting slat inside, and the aeration membrane is sleeved on the outside of the supporting slat and fixed by coupling and stainless steel clamps. The aeration membrane is mechanically punched, and the holes are opened when aeration is performed, and the holes are automatically closed when no aeration is performed to prevent back leakage. The membrane slat aerator, the diaphragm aerator and the rotary mixing aerator are homogeneous and light, suitable for lifting. Among them, the height of the membrane slat aerator is smaller than the diameter of the annular air supply pipe 2, so that the top of the annular air supply pipe 2 is higher than the upper surface of the membrane slat aerator. When the aerator 3 and the annular air supply pipe 2 are raised above the liquid level of the sewage sludge mixture as a whole, a movable walkway board can be set up on the annular air supply pipe 2 to facilitate the replacement of partially damaged membrane slat aerators.

[0028] Taking the membrane slat aerator as an example, the membrane slat aerator is arranged in strips, and multiple annular air supply pipes 2 are arranged in parallel in the reaction tank 1. With the help of the aerator installed on the annular air supply pipe 2, multiple filtering air curtains are formed. When the sewage passes through hundreds of air curtains in sequence, the sewage, sludge and suspended biological carriers 100 in the reaction tank can be aerated. Finally, there is no aeration dead zone and no short flow in the entire reaction tank. At the same time, large-area aeration can form a circulating flow state. After the bubbles in the sewage reach the liquid surface, they enter the sewage for the second time under the action of the circulating flow, which improves the oxygen utilization rate and promotes the suspended biological carriers 100 to tumble evenly up and down in the reaction tank 1.

[0029] Among them, the annular air supply pipe 2 is connected to the air inlet pipe 4 by a connector or directly welded and fixed. The annular air supply pipe 2 can be a square ring or a circular ring. Preferably, the shape of the annular air supply pipe 2 is consistent with the bottom shape of the reaction tank 1. The air inlet pipe 4 and the drain pipe 5 are arranged oppositely at both ends of the annular air supply pipe 2. When the annular air supply pipe 2 is a square ring, the air inlet pipe 4 and the drain pipe 5 are relatively arranged on opposite sides of the square ring; when the annular air supply pipe 2 is a circular ring, the air inlet pipe 4 and the drain pipe 5 are relatively arranged along the radial direction of the circular ring. After the aeration system has been running for a period of time, the aerator 3 will produce condensed water, resulting in an increase in aeration resistance. The condensed water is discharged with the help of the drain pipe 5. The drain pipe 5 is arranged opposite to the air inlet pipe 4, which helps to improve the discharge effect of the condensed water.

[0030] Preferably, there are two drain pipes 5, and the two drain pipes 5 are arranged at intervals on the same side of the annular air supply pipe 2. For example, the two drain pipes 5 are arranged on the same pipe body of the square annular air supply pipe 2, or the two drain pipes 5 are arranged at both ends of the same chord length of the circular annular air supply pipe 2, and the air inlet pipe 4 is arranged at the intersection of the midpoint of the chord length passing through the center of the circle and the circle. Compared with a single drain pipe 5, the two drain pipes 5 are balanced in force, making the force of the annular air supply pipe 2 more stable, and further improving the discharge effect of condensed water.

[0031] Specifically, both the air inlet pipe 4 and the drain pipe 5 extend in the depth direction of the reaction tank 1, and one end of the air inlet pipe 4 is connected to the gas delivery pipe 9 through the adapter elbow 8. A gas supply valve 10 is installed on the gas delivery pipe 9, and a drain valve 11 is installed on the top of the drain pipe 5. The top of the drain pipe 5 can be connected to another adapter elbow 8 or can be directly set upright. When there are two drain pipes 5, a drain valve 11 is installed on each drain pipe 5. Among them, the air inlet pipe 4 is connected to the air supply valve 10 through a flange, and the other side of the air supply valve 10 is connected to the gas delivery pipe 9 through another flange. Under normal operating conditions, air enters the annular air supply pipe 2 through the gas delivery pipe 9, and then is evenly exposed from the aerator 3. The air supply valve 10 can be used to control the flow of air, thereby controlling the amount of oxygen in the reaction tank 1. The drain pipe 5 and the air inlet pipe 4 can both be vertical risers or curved pipes, which are not specifically limited.

[0032] In addition, in the reaction pool filled with suspended biological carriers 100, the suspended biological carriers 100 are easily pressed during the process of lifting or lowering the aerator 3, which makes it difficult to place the annular air supply pipe 2 horizontally. In order to ensure that the aerator 3 in the reaction pool 1 is at the same horizontal position, the liftable aeration system for the reaction pool containing suspended biological carriers provided by the embodiment of the present invention has a bracket 12 fixedly installed at the bottom of the reaction pool 1. When the annular air supply pipe 2 is lowered and collides with the bracket 12, there is a gap between the bracket 12 and the bottom of the pool, which effectively avoids pressing the suspended biological carriers 100.

[0033] In the embodiment of the present invention, Figure 2 As shown, a plurality of lifting ears 13 are fixedly installed on the annular air supply pipe 2, a fixing piece is installed at the pool mouth of the reaction pool 1, one end of the lifting rope 6 is connected to the lifting ear 13, and the other end is wrapped around the fixing piece. The fixing piece may be a pipe fixing frame, which is used to set up the drain pipe 5 or the air intake pipe 4 and can also fix the end of the lifting rope 6 under normal working conditions. When the aerator 3 needs to be repaired, the drain pipe 5, the air intake pipe 4 and the lifting rope 6 are removed from the pipe fixing frame, and the lifting rope 6 is lifted with the help of an external traction device or manually. In addition, ground anchor bolts can be used as fixing pieces, and the lifting rope 6 is tied and fixed on the bolts, and removed from the bolts when needed, thereby separating the fixing pieces of the pipe fixing frame and the lifting rope 6.

[0034] The weight and location of the counterweight 7 are calculated based on the buoyancy of the annular air supply pipe 2. Figure 2 In the illustrated liftable aeration system for a reaction pool containing suspended biological carriers, there are four counterweights 7, which are evenly distributed on the annular air supply pipe 2. When the annular air supply pipe 2 is a square ring, the four counterweights 7 are grouped in pairs, and the two groups of counterweights 7 are relatively arranged on two opposite sides of the annular air supply pipe 2; when the annular air supply pipe 2 is a circular ring, the four counterweights 7 are evenly distributed on the circular ring at equal intervals.

[0035] Preferably, the liftable aeration system for a reaction pool containing suspended biological carriers further comprises a movable traction device 14, which can be a crane or a pulley structure. The lifting rope 6 is pulled by the traction device 14, thereby pulling the aerator 3 from the bottom of the pool or lowering it again after maintenance. Four traction devices 14 can be provided, which are respectively arranged at the four corners of the square ring-shaped annular air supply pipe 2. When in use, the lifting handle is manually shaken to evenly lift the annular air supply pipe 2 above the liquid surface for inspection and maintenance.

[0036] When the annular air supply pipe 2 provided in the embodiment of the present invention is a square ring, its length can be set at 2m to 20m as needed, and its width can be set at 1m to 10m, and the specific dimensions can be arbitrarily combined; when it is a circular ring, its diameter is between 1m and 20m, and the specific dimensions can be selected according to the size of the reaction pool.

[0037] The liftable aeration system provided by the present invention can be installed without stopping the sewage treatment plant, and can perform aeration tests at any time, especially for projects that need to upgrade the aeration standard, which can avoid economic losses caused by stopping production. In addition, when the aerator fails during operation, it can be directly lifted out of the water, and then put back into the water after inspection, cleaning, and maintenance, ensuring that the aerator operates more effectively and can ensure the operating efficiency of the plant, breaking the traditional dilemma that once the aerator is damaged, the sewage treatment plant can only let it go and wait until the right time to stop water for maintenance.

[0038] In addition, an embodiment of the present invention further provides a reaction tank, including the above-mentioned liftable aeration system for a reaction tank containing suspended biological carriers. Specifically, one or more liftable aeration systems can be installed in a reaction tank, which is specifically determined according to the size of the reaction tank and the size of the annular air supply pipe in the liftable aeration system. By using the above-mentioned liftable aeration system, the reaction tank does not need to install any mechanical moving parts in the reaction tank, and there are no relatively moving parts during the lifting and lowering process, thereby avoiding interference between the sewage sludge mixture and the suspended biological carriers, so that it can be inspected and maintained at any time as needed, without reducing production and draining water during maintenance, thereby reducing operating costs. In addition, it can also effectively avoid damaging the suspended biological carriers in the reaction tank when lifting or lowering the aerator.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liftable aeration system for a reaction tank containing a suspended biological carrier, characterized in that: It includes an annular air supply pipe, an aerator, an air inlet pipe and a drain pipe, wherein the aerator is installed on the annular air supply pipe and communicated with the annular air supply pipe, the aerator is laid in the reaction tank through the annular air supply pipe, the bottom of the air inlet pipe and the bottom of the drain pipe are both communicated with the annular air supply pipe, the top of the air inlet pipe and the top of the drain pipe are respectively detachably installed at the pool mouth of the reaction tank, and a lifting rope is installed on the annular air supply pipe and a counterweight is configured; The air inlet pipe and the drain pipe are arranged opposite to each other at two ends of the annular air supply pipe; There are two drainage pipes, which are arranged at intervals on the same side of the annular air supply pipe; The air inlet pipe and the drainage pipe both extend along the depth direction of the reaction pool. One end of the air inlet pipe is connected to the gas delivery pipe through a connecting elbow. A gas supply valve is installed on the gas delivery pipe, and a drainage valve is installed on the top of the drainage pipe.

2. The liftable aeration system for a reaction pool containing suspended biological carriers according to claim 1, characterized in that: The aerator is a combination of any one or more of a membrane strip aerator, a diaphragm aerator and a rotary mixing aerator.

3. The liftable aeration system for a reaction pool containing suspended biological carriers according to claim 1, characterized in that: Also included is a bracket installed at the bottom of the reaction tank.

4. The liftable aeration system for a reaction pool containing suspended biological carriers according to claim 1, characterized in that: The annular air supply pipe is fixedly mounted with a plurality of lifting ears, the pool mouth of the reaction pool is mounted with a fixing piece, one end of the lifting rope is fixedly connected to the lifting ear, and the other end of the lifting rope is fixed to the fixing piece.

5. The liftable aeration system for a reaction pool containing suspended biological carriers according to claim 1, 3 or 4, characterized in that: The counterweight blocks include four, and the four counterweight blocks are evenly distributed on the annular air supply pipe.

6. The liftable aeration system for a reaction pool containing suspended biological carriers according to claim 1, characterized in that: It also includes a traction device, which is used to pull the lifting rope to achieve the lifting of the aerator.

7. A reaction tank, characterized in that: The invention comprises a liftable aeration system for a reaction pond containing suspended biological carriers as described in any one of claims 1 to 6.

Images