UASB water distribution system

Abstract

The invention discloses a UASB (upflow anaerobic sludge blanket) water distribution system which comprises a reaction cylinder, a water distribution area is formed in the reaction cylinder close to the bottom, a water distribution weir is arranged on one side of the reaction cylinder, and the water distribution weir is separated from the water distribution area through a weir plate horizontally and slidably assembled with the bottom of the reaction cylinder. Tangential water inlet channels are formed between the two sides of the weir plate and the side wall of the reaction cylinder. A stirring blade is mounted in the water distribution area through a stirring shaft, and the weir plate is connected with the stirring shaft through a linkage mechanism. According to the UASB water distribution system, sewage tangentially enters the water distribution area at the bottom of the reactor from the two sides after passing through the water distribution weir, and is uniformly stirred by the stirring blades and upwards pushed to flow and distribute water, so that on one hand, the problems that an existing water distribution system is large in head loss and inconvenient to maintain are solved; on the other hand, the uniformity of water distribution is improved, and the phenomenon of'short flow 'or'channeling' caused by too high water inflow is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a UASB water distribution system. Background Art

[0002] The UASB anaerobic reactor is mainly composed of a water distribution system, a three-phase separator, a water collection system, and a sludge discharge system. The reasonable design of the water distribution system is crucial to the smooth operation of the UASB reactor. The water inlet system has the functions of water distribution and hydraulic stirring. In order to ensure the realization of these two functions, the following principles must be met during the design: (1) Ensure that the water inlet volume per unit area is basically the same to prevent short circuits or uneven surface loads; (2) Meet the hydraulic stirring requirements as much as possible to ensure that the organic matter in the inlet water is quickly mixed with the sludge; (3) It is easy to observe the blockage of the water inlet pipe; (4) Once the blockage is found, it is easy to clear.

[0003] Currently on the market, the commonly used USAB water distribution systems are mainly divided into the following two types: (1) Water distribution system on UASB: The water distribution sleeve and branch pipe extend from the top of the reactor to the appropriate position at the bottom of the reactor, a detachable ball valve is set on the water distribution branch pipe, and a bell mouth is set at the branch pipe outlet, which realizes the function of online maintenance or replacement of the water distribution branch pipe, greatly extending the service life of the UASB, but greatly increasing the frequency and intensity of operation and maintenance.

[0004] (2) UASB lower water distribution system: The water distribution main pipe is inserted into the reactor from the bottom side of the reactor to distribute water at the bottom. It is divided into a small resistance water distribution system and a large resistance water distribution system. The small resistance water distribution system mainly uses a single-layer or double-layer perforated water distributor, which is not easy to clog, but the water distribution uniformity is poor, the structure is complex, and it is not easy to maintain. The large resistance water distribution system generally uses a perforated pipe instead of the perforated plate in the small resistance system. Its advantage is uniform water distribution, but the orifice head loss is too large, the pipe and orifice are easy to clog, and maintenance is difficult. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a UASB water distribution system, which, on the one hand, solves the problem of large head loss and inconvenient maintenance of the existing water distribution system; on the other hand, improves the uniformity of water distribution and prevents the phenomenon of "short flow" or "channel flow" caused by excessive water inflow.

[0006] The present invention solves the above problems by the following technical means: A UASB water distribution system comprises a reaction cylinder, wherein a water distribution area is formed near the bottom of the reaction cylinder, a water distribution weir is arranged on one side of the reaction cylinder, the water distribution weir and the water distribution area are separated by a weir plate horizontally slidably assembled with the bottom of the reaction cylinder, and tangential water inlet channels are formed between the two sides of the weir plate and the side wall of the reaction cylinder; a stirring blade is installed in the water distribution area through a stirring shaft, and the weir plate is connected to the stirring shaft through a linkage mechanism.

[0007] Furthermore, the linkage mechanism includes a rack and a gear, the rack is fixedly connected to the weir plate, the gear is fixedly sleeved and assembled with the stirring shaft, and the rack is meshed with the gear for transmission.

[0008] Furthermore, a return spring is connected between the free end of the rack and the inner wall of the reaction tube.

[0009] Furthermore, a bracket is provided at the bottom of the reaction cylinder, the stirring shaft is rotatably assembled with the bracket, and the stirring blade is fixedly mounted on the stirring shaft.

[0010] Furthermore, the stirring shaft is rotatably assembled with the bracket via a bearing.

[0011] Furthermore, the water distribution weir is connected to a water inlet pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The UASB water distribution system of the present application includes a reaction tube, wherein a water distribution area is formed near the bottom of the reaction tube, a water distribution weir is arranged on one side of the reaction tube, the water distribution weir and the water distribution area are separated by a weir plate assembled with horizontal sliding on the bottom of the reaction tube, and tangential water inlet channels are formed between the two sides of the weir plate and the side walls of the reaction tube; stirring blades are installed in the water distribution area through a stirring shaft, and the weir plate is connected to the stirring shaft through a linkage mechanism. In the UASB water distribution system of the present application, sewage enters the water distribution area at the bottom of the reactor tangentially from both sides after passing through the water distribution weir, and is evenly stirred by stirring blades, and the water is pushed upward for distribution. On the one hand, it solves the problem of large head loss and inconvenient maintenance of the existing water distribution system; on the other hand, it improves the uniformity of water distribution and avoids the phenomenon of "short flow" or "channel flow" due to excessive water inflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a top view of a preferred embodiment of the present invention.

[0015] Figure 2 It is a forward schematic diagram of the installation of the stirring blade according to the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present invention will become clearer and more specific. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0017] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0019] See also Figure 1 to Figure 2 As shown, the present embodiment discloses a UASB water distribution system, including a reaction cylinder, wherein a water distribution area 5 is formed near the bottom of the reaction cylinder, a water distribution weir 2 is arranged on one side of the reaction cylinder, the water distribution weir is connected to a water inlet pipe 1, the water distribution weir and the water distribution area are separated by a weir plate 4 horizontally slidably assembled with the bottom of the reaction cylinder, and tangential water inlet channels 3 are formed between both sides of the weir plate and the side walls of the reaction cylinder; a stirring blade 7 is installed in the water distribution area through a stirring shaft 6, specifically, a bracket 12 is arranged at the bottom of the reaction cylinder, the stirring shaft is rotatably assembled with the bracket, and the stirring blade is fixedly mounted on the stirring shaft, so that the stirring blade can rotate with the stirring shaft, preferably, in order to improve the smoothness of the rotation of the stirring shaft, a bearing 10 is installed at the assembly of the stirring shaft and the bracket.

[0020] The weir plate is connected to the stirring shaft through a linkage mechanism; in this embodiment, the linkage mechanism includes a rack 8 and a gear 11, the rack is fixedly connected to the weir plate, the gear is fixedly sleeved and assembled with the stirring shaft, and the rack and the gear are meshed for transmission. When the weir plate moves horizontally under the hydraulic force of the incoming water flow, it will drive the rack to move horizontally synchronously, and then drive the gear, the stirring shaft and the stirring blade to rotate synchronously, so as to stir the water in the water distribution area; preferably, a reset spring 9 is connected between the free end of the rack and the inner wall of the reaction cylinder; in this way, when the water flow driving force is greater than the reset spring elastic force, the weir plate moves to the side of the compressed reset spring, and when the water flow driving force is less than the reset spring elastic force, the weir plate moves in the opposite direction, so that the weir plate can move back and forth, thereby driving the stirring shaft and the stirring blade to rotate back and forth, and the water in the water distribution area can be stirred back and forth to avoid the formation of a dead zone; it is necessary to explain that in the above explanation of the reciprocating stirring of the stirring shaft by the reset spring, the influence of water flow resistance and the like is ignored in the force analysis consideration.

[0021] During operation, after the sewage enters the water distribution weir 2 through the water inlet pipe 1, it enters the water distribution area 5 along the tangential water inlet channels 3 on both sides of the weir plate. The tangential water inlet can maintain a certain disturbance force on the water flow and improve its mixing with the sludge bed; with the entry of sewage, the weir plate 4 moves inward under the action of hydraulic force, pushing the rack 8 to drive the gear 11 to rotate, thereby driving the stirring blade 7 to rotate through the stirring shaft 6. Due to the impact force of the rack 8 on the reset spring 9, the reset spring 9 will instantly give the rack 8 a rebound force, so that the rack 8 drives the stirring blade 7 to rotate in the opposite direction. No additional power equipment is required. The entire uniform water distribution process can be completed by reciprocating operation. The water inlet flow rate is adjusted according to needs, and the water inlet flow rate can be set according to time according to the needs of water distribution.

[0022] In summary, in the UASB water distribution system of the present application, the sewage enters the water distribution area at the bottom of the reactor from both sides tangentially after passing through the water distribution weir, is evenly stirred by the stirring blades, and pushes the water upward for distribution. On the one hand, the tangential water inlet can maintain a certain disturbance force for the water inlet flow, which is beneficial to solving the problem of large head loss in the existing water distribution system. Furthermore, the water distribution process does not require the laying of water distribution pipes at the bottom of the reaction cylinder, which solves the problems of pipe blockage and inconvenient maintenance; on the other hand, through repeated stirring, the uniformity of water distribution is improved, avoiding the phenomenon of "short flow" or "channel flow" due to excessive water inlet.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A UASB water distribution system, comprising a reaction tube, wherein a water distribution area is formed near the bottom of the reaction tube, characterized in that: A water distribution weir is arranged on one side of the reaction cylinder, and the water distribution weir is separated from the water distribution area by a weir plate horizontally slidably assembled with the bottom of the reaction cylinder, and tangential water inlet channels are formed between the two sides of the weir plate and the side wall of the reaction cylinder; a stirring blade is installed in the water distribution area through a stirring shaft, and the weir plate is connected to the stirring shaft through a linkage mechanism.

2. The UASB water distribution system according to claim 1, characterized in that: The linkage mechanism comprises a rack and a gear, wherein the rack is fixedly connected to the weir plate, the gear is fixedly sleeved and assembled with the stirring shaft, and the rack is meshed with the gear for transmission.

3. The UASB water distribution system according to claim 2, characterized in that: A return spring is connected between the free end of the rack and the inner wall of the reaction tube.

4. The UASB water distribution system according to any one of claims 1 to 3, characterized in that: A bracket is arranged at the bottom of the reaction cylinder, the stirring shaft is rotatably assembled with the bracket, and the stirring blade is fixedly mounted on the stirring shaft.

5. The UASB water distribution system according to claim 4, characterized in that: The stirring shaft is rotatably assembled with the bracket via a bearing.

6. The UASB water distribution system according to claim 5, characterized in that: The water distribution weir is connected with a water inlet pipe.

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