Multi-point water distribution high-load biological denitrification tank

Abstract

The invention discloses a multi-point water distribution high-load biological denitrification tank, which relates to the technical field of water treatment and comprises a denitrification tank, a filler system, a water distribution system and a water inlet system. The denitrification tank is used for providing a place for the denitrification process. The filler system comprises an elastic filler and a filler bracket, and the elastic filler is suspended on the filler bracket and is positioned in the denitrification tank. And the filler bracket is fixedly connected with the denitrification tank. The water distribution system comprises a plurality of water distribution heads which are uniformly fixed at the bottom of the denitrification tank so as to form up-flow type circulation while uniformly distributing water. The water inlet system is communicated with the water distribution system and is used for supplying mixed liquid of raw water, nitrification liquid and denitrification tank circulating liquid to the water distribution system. Compared with the prior art, the multi-point water distribution high-load biological denitrification tank has the advantages that the operation and maintenance cost can be reduced while the treatment capacity of the denitrification tank is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a multi-point water distribution high-load biological denitrification pool. Background Art

[0002] Anaerobic biogas slurry from perishable garbage, leachate from garbage, and aquaculture wastewater are all high-nitrogen organic wastewaters, and denitrification is the main process of denitrification in the biochemical system, so higher and higher requirements are placed on the treatment performance of the denitrification tank. The traditional two-stage AO ("AO" refers to the combination of anoxic and aerobic processes) pre-denitrification tank has a relatively simple structure. In order to prevent sludge from depositing at the bottom of the tank and ensure full contact between various materials, submersible mixers or flow generators are generally installed in the tank. This solution is highly universal, but there are the following problems:

[0003] (1) In order to maintain a high denitrification efficiency, the sludge concentration in the denitrification tank is relatively high, the stirring resistance of the submersible mixer is high, and the power consumption is large;

[0004] (2) Submersible mixers and flowmakers must be installed underwater, and sewage is highly corrosive, resulting in a high failure rate;

[0005] (3) In order to increase the treatment load of the denitrification tank, it is necessary to hang elastic fillers in the tank to increase the contact area between microorganisms and sewage, but the installation of the submersible mixer conflicts with the hanging installation of the fillers; Summary of the invention

[0006] The purpose of the present invention is to provide a multi-point water distribution high-load biological denitrification pool, which can improve the treatment capacity of the denitrification pool and reduce the operation and maintenance costs.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention discloses a multi-point water distribution high-load biological denitrification pool, comprising:

[0009] Denitrification tank, used to provide a place for the denitrification process;

[0010] A filler system, comprising an elastic filler and a filler support, wherein the elastic filler is suspended on the filler support and is located in the denitrification tank; the filler support is fixedly connected to the denitrification tank;

[0011] A water distribution system, comprising a plurality of water distribution heads, wherein the plurality of water distribution heads are evenly fixed at the bottom of the denitrification tank to form an upflow circulation while evenly distributing water;

[0012] The water inlet system is connected to the water distribution system and is used to supply a mixed solution of raw water, nitrification liquid and denitrification tank circulating liquid to the water distribution system.

[0013] Preferably, the multi-point water distribution high-load biological denitrification tank further comprises an overflow tank, and the overflow tank is separated from the denitrification tank by an overflow weir.

[0014] Preferably, the upper edge of the overflow weir is serrated.

[0015] Preferably, the water distribution system also includes water distribution channel 1 and water distribution channel 2, the water distribution channel 1 is horizontally arranged, the upper end of the water distribution channel 2 is connected to the water distribution channel 1, and the lower end of the water distribution channel 2 is connected to the water distribution head; the water distribution channel 1 is connected to multiple water distribution channels 2 at the same time.

[0016] Preferably, the water inlet system is connected to the middle part of the water distribution channel one, and the plurality of water distribution channels two are symmetrically distributed about the middle part of the water distribution channel one.

[0017] Preferably, a valve and a high-pressure air pipe joint are provided on the second water distribution channel, and the valve is located on the upstream side of the high-pressure air pipe joint.

[0018] Preferably, the water distribution channel one is a water distribution trough, and the top of the water distribution channel one is a detachably fixed sealing cover plate.

[0019] Preferably, the water inlet system includes a nitrification liquid reflux inlet pipe, a denitrification tank circulating liquid inlet pipe, a raw water inlet pipe and a water inlet main pipe; the nitrification liquid reflux inlet pipe, the denitrification tank circulating liquid inlet pipe and the raw water inlet pipe are all connected to the water inlet main pipe to supply nitrification liquid, denitrification tank circulating liquid and raw water to the water inlet main pipe respectively; the water inlet main pipe is connected to the water distribution system to supply a mixed liquid of nitrification liquid, denitrification tank circulating liquid and raw water to the water distribution system.

[0020] Preferably, a static spiral mixer is provided inside the water inlet main pipe to improve the mixing degree of the fluid inside the water inlet main pipe.

[0021] Preferably, the nitrification liquid reflux water inlet pipe, the denitrification tank circulating liquid water inlet pipe and the raw water water inlet pipe are all provided with check valves.

[0022] Compared with the related art, the present invention has achieved the following technical effects:

[0023] 1. The denitrification tank of the present invention is equipped with elastic fillers, which increases the contact area between microorganisms and various materials in the tank and increases the denitrification treatment load;

[0024] 2. The multi-point water distribution method of the present invention can effectively reduce the impact of water distribution pipe blockage and improve the mixing effect of materials in the denitrification tank;

[0025] 3. The present invention prevents sludge from settling at the bottom of the pool without using a submersible mixer and a flow promoter, and ensures full contact between various materials, thereby achieving a balance between improving the processing capacity of the denitrification pool and reducing the operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only 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.

[0027] Figure 1 This is a schematic diagram of a multi-point water distribution high-load biological denitrification pool according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the cross section of the structure;

[0029] Figure 3 for Figure 2 Side view of the central water distribution system;

[0030] In the figure: 1-denitrification tank; 2-water distribution trough; 3-water distribution hose; 4-overflow weir; 5-nitrification liquid reflux inlet pipe; 6-denitrification tank circulating liquid inlet pipe; 7-raw water inlet pipe; 8-check valve; 9-sludge outlet; 10-water inlet main pipe; 11-static spiral mixer; 12-overflow trough outlet; 13-filling bracket; 14-valve; 15-water distribution head; 16-water flow distribution pipe; 17-sealing cover plate; 18-high-pressure air pipe joint; 19-elastic filler; 20-water outlet main pipe; 21-water outlet valve. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0032] The purpose of the present invention is to provide a multi-point water distribution high-load biological denitrification pool, which can improve the treatment capacity of the denitrification pool and reduce the operation and maintenance costs.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figure 1 to Figure 3This embodiment provides a multi-point water distribution high-load biological denitrification pool, including a denitrification pool 1, a filler system, a water distribution system and a water inlet system.

[0035] The denitrification tank 1 is used to provide a place for the denitrification process. The filler system includes an elastic filler 19 and a filler bracket 13, and the elastic filler 19 is suspended on the filler bracket 13 and is located in the denitrification tank 1. The filler bracket 13 is fixedly connected to the denitrification tank 1. The water distribution system includes a plurality of water distribution heads 15, and the plurality of water distribution heads 15 are evenly fixed at the bottom of the denitrification tank 1 to form an upflow circulation while evenly distributing water. The water inlet system is connected to the water distribution system to supply a mixture of raw water, nitrification liquid and denitrification tank circulating liquid to the water distribution system. Among them, the upper and middle part of the denitrification tank 1 is the denitrification tank circulating liquid, and the denitrification tank circulating liquid is pumped out to the denitrification tank circulating liquid inlet pipe 6 by a water pump.

[0036] The working principle of the multi-point water distribution high-load biological denitrification pool in this embodiment is as follows:

[0037] The elastic filler 19 can enrich denitrifying bacteria, increase the number of denitrifying bacteria and the contact area between the denitrifying bacteria and sewage and other materials, thereby increasing the total nitrogen bearing load in the system and improving the treatment capacity of the denitrification tank 1.

[0038] Multiple water distribution heads 15 are evenly fixed at the bottom of the denitrification tank 1, directly achieving uniform water distribution at the bottom of the denitrification tank 1, and forming an upflow circulation, eliminating the dead corners of the reaction zone in the tank. A sludge gradient is formed in the vertical direction, which is convenient for the stratified enrichment of different functional microbial communities and improves the efficiency of denitrification. At the same time, under the multi-point water distribution method, the impact of local blockage is small, which helps to improve the mixing effect in the denitrification tank 1.

[0039] Therefore, this embodiment not only avoids the problems of high power consumption, high failure rate and mutual interference with the suspended elastic filler 19 caused by the use of submersible mixers and flowmakers, but also can prevent sludge from depositing at the bottom of the pool without using submersible mixers and flowmakers, and ensure full contact of various materials, thereby achieving a balance between improving the processing capacity of the denitrification pool 1 and reducing operation and maintenance costs.

[0040] As a possible example, in this embodiment, the multi-point water distribution high-load biological denitrification pool also includes an overflow tank, and the overflow tank is separated from the denitrification pool 1 by an overflow weir 4.

[0041] When the denitrification process reacts violently, a layer of floating mud will form on the liquid surface of the denitrification tank 1. By collecting the surface water with floating mud into the overflow tank, the formation of a thick mud layer on the liquid surface of the denitrification tank 1 can be avoided, thereby ensuring normal hydraulic circulation in the denitrification tank 1.

[0042] Exemplarily, the overflow trough and the overflow weir 4 are distributed in a ring shape to achieve overflow on all sides of the denitrification tank 1 at the same time to avoid local residual floating mud.

[0043] Exemplarily, the overflow tank is provided with an overflow tank outlet 12, which is connected to a water outlet main pipe 20 to guide the water flow in the overflow tank out. The water outlet main pipe 20 is provided with a water outlet valve 21 to control the water outlet process of the overflow tank.

[0044] As a possible example, in this embodiment, a sludge outlet 9 is provided at the bottom of the denitrification tank 1. When the sludge concentration in the denitrification tank 1 exceeds the designed concentration or needs to be emptied, the sludge outlet 9 can be opened to discharge the sludge in the denitrification tank 1.

[0045] As a possible example, in this embodiment, the upper edge of the overflow weir 4 is serrated to increase the flow coefficient and evenly distribute the water flow.

[0046] As a possible example, in this embodiment, the water distribution system further includes water distribution channel 1 and water distribution channel 2, water distribution channel 1 is horizontally arranged, the upper end of water distribution channel 2 is connected to water distribution channel 1, and the lower end of water distribution channel 2 is connected to water distribution head 15. Water distribution channel 1 is connected to multiple water distribution channels 2 at the same time.

[0047] Through the multiple water distribution channels 2 arranged in parallel, the water flow in the water distribution channel 1 is evenly distributed to the multiple water distribution heads 15. Since the water distribution channel 1 is arranged horizontally, the water pressure at the upper ends of the multiple water distribution channels 2 is the same, thereby achieving uniform water distribution of the multiple water distribution heads 15.

[0048] As a possible example, in this embodiment, the water inlet system is connected to the middle of the water distribution channel one, and the plurality of water distribution channels two are symmetrically distributed about the middle of the water distribution channel one.

[0049] It should be noted that if the water inlet system is connected to one end of the water distribution channel 1, when the water supply of the water inlet system is insufficient, the water distribution channel 2 and the water distribution head 15 close to the water inlet system will be allocated more water flow, resulting in more water distribution on one side of the denitrification tank 1 and uneven water distribution.

[0050] In this embodiment, the water inlet system is connected to the middle of the water distribution channel 1, and the plurality of water distribution channels 2 are symmetrically distributed about the middle of the water distribution channel 1. Even when the water inlet system is insufficiently supplied with water, symmetrical water distribution on both sides can still be achieved.

[0051] As a possible example, in this embodiment, a valve 14 and a high-pressure air pipe connector 18 are provided on the water distribution channel 2, and the valve 14 is located on the upstream side of the high-pressure air pipe connector 18.

[0052] By turning down or closing the valve 14, the water flow can be distributed among different water distribution channels 2. When the water distribution channel 2 or the water distribution head 15 is blocked or the water flow is not smooth, the valve 14 can be closed, and high-pressure air can be connected to the high-pressure air pipe joint 18. The blockage in the water distribution channel 2 or the water distribution head 15 can be flushed out by the pressure impact of the high-pressure air, so as to achieve the purpose of pipeline dredging. The setting of this function can realize non-stop maintenance and realize long-term continuous operation of the multi-point water distribution high-load biological denitrification pool.

[0053] As a possible example, in this embodiment, the water distribution channel 1 is a water distribution tank 2, and the top of the water distribution channel 1 is a detachably fixed sealing cover plate 17. After the sealing cover plate 17 is removed, the inside of the water distribution channel 1 can be cleaned.

[0054] Exemplarily, the water distribution channel 2 includes a water flow distribution pipe 16 and a water distribution hose 3. The upper end of the water flow distribution pipe 16 is connected to the water distribution channel 1, the lower end of the water flow distribution pipe 16 is connected to the upper end of the valve 14, the lower end of the valve 14 is connected to the upper end of the water distribution hose 3, and the lower end of the water distribution hose 3 is connected to the water distribution head 15. Compared with a straight pipe, the water distribution hose 3 can flexibly set the water distribution head 15 within a certain range by bending itself to avoid dead angles for water distribution.

[0055] As a possible example, in this embodiment, the water inlet system includes a nitrification liquid return water inlet pipe 5, a denitrification tank circulating liquid water inlet pipe 6, a raw water inlet pipe 7 and a water inlet main pipe 10. The nitrification liquid return water inlet pipe 5, the denitrification tank circulating liquid water inlet pipe 6 and the raw water inlet pipe 7 are all connected to the water inlet main pipe 10 to respectively supply nitrification liquid, denitrification tank circulating liquid and raw water to the water inlet main pipe 10. The water inlet main pipe 10 is connected to the water distribution system to supply a mixed solution of nitrification liquid, denitrification tank circulating liquid and raw water to the water distribution system.

[0056] In this embodiment, the three liquids are mixed directly in the water inlet main pipe 10, which reduces the occupied space. However, the actual implementation is not limited to this. For example, the water inlet system may also include a mixing tank, the nitrification liquid return water inlet pipe 5, the denitrification tank circulating liquid water inlet pipe 6, and the raw water inlet pipe 7 are connected to the mixing tank, and the mixing tank discharges the water flow to the water inlet main pipe 10, which can also achieve the mixing of the three liquids.

[0057] Exemplarily, the water inlet system further includes a plurality of branch pipes, the outlet of the water inlet main pipe 10 is simultaneously connected to the plurality of branch pipes, and the plurality of branch pipes are respectively connected to the middle of the plurality of water distribution channels 1 to expand the water distribution range. Figure 1 In the embodiment, the number of branch pipes and water distribution channel 1 are both two, one water distribution channel 1 is connected to four water distribution channels 2, and the four water distribution channels 2 are arranged at equal intervals. It is understandable that those skilled in the art can also select other numbers of water distribution channels 1, water distribution channels 2, water distribution heads 15 and branch pipes according to the specific size of the denitrification tank 1.

[0058] As a possible example, in this embodiment, a static spiral mixer 11 is provided in the water inlet main pipe 10 to improve the mixing degree of the fluid inside the water inlet main pipe 10. By providing the static spiral mixer 11, the three liquids are mixed together quickly and evenly in the shorter water inlet main pipe 10.

[0059] As a possible example, in this embodiment, the nitrification liquid return inlet pipe 5, the denitrification tank circulating liquid inlet pipe 6 and the raw water inlet pipe 7 all realize liquid transportation through corresponding circulation pumps, and are all provided with a check valve 8 to prevent liquid backflow.

[0060] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A multi-point water distribution high-load biological denitrification pool, characterized in that: include: Denitrification tank, used to provide a place for the denitrification process; A filler system, comprising an elastic filler and a filler support, wherein the elastic filler is suspended on the filler support and is located in the denitrification tank; the filler support is fixedly connected to the denitrification tank; A water distribution system, comprising a plurality of water distribution heads, wherein the plurality of water distribution heads are evenly fixed at the bottom of the denitrification tank to form an upflow circulation while evenly distributing water; The water inlet system is connected to the water distribution system and is used to supply a mixed solution of raw water, nitrification liquid and denitrification tank circulating liquid to the water distribution system.

2. The multi-point water distribution high-load biological denitrification pool according to claim 1, characterized in that: It also includes an overflow tank, which is separated from the denitrification tank by an overflow weir.

3. The multi-point water distribution high-load biological denitrification pool according to claim 2, characterized in that: The upper edge of the overflow weir is serrated.

4. The multi-point water distribution high-load biological denitrification pool according to claim 1, characterized in that: The water distribution system also includes water distribution channel 1 and water distribution channel 2. The water distribution channel 1 is horizontally arranged, the upper end of the water distribution channel 2 is connected to the water distribution channel 1, and the lower end of the water distribution channel 2 is connected to the water distribution head; the water distribution channel 1 is connected to multiple water distribution channels 2 at the same time.

5. The multi-point water distribution high-load biological denitrification pool according to claim 4, characterized in that: The water inlet system is connected to the middle part of the water distribution channel one, and the plurality of water distribution channels two are symmetrically distributed about the middle part of the water distribution channel one.

6. The multi-point water distribution high-load biological denitrification pool according to claim 4, characterized in that: The second water distribution channel is provided with a valve and a high-pressure air pipe joint, and the valve is located on the upstream side of the high-pressure air pipe joint.

7. The multi-point water distribution high-load biological denitrification pool according to claim 4, characterized in that: The water distribution channel one is a water distribution trough, and the top of the water distribution channel one is a detachably fixed sealing cover plate.

8. The multi-point water distribution high-load biological denitrification pool according to claim 1, characterized in that: The water inlet system includes a nitrification liquid return inlet pipe, a denitrification tank circulating liquid inlet pipe, a raw water inlet pipe and a water inlet main pipe; the nitrification liquid return inlet pipe, the denitrification tank circulating liquid inlet pipe and the raw water inlet pipe are all connected to the water inlet main pipe to supply nitrification liquid, denitrification tank circulating liquid and raw water to the water inlet main pipe respectively; the water inlet main pipe is connected to the water distribution system to supply a mixed liquid of nitrification liquid, denitrification tank circulating liquid and raw water to the water distribution system.

9. The multi-point water distribution high-load biological denitrification pool according to claim 8, characterized in that: A static spiral mixer is arranged inside the water inlet main pipe to improve the mixing degree of the fluid inside the water inlet main pipe.

10. The multi-point water distribution high-load biological denitrification pool according to claim 8, characterized in that: The nitrification liquid reflux water inlet pipe, the denitrification tank circulating liquid water inlet pipe and the raw water water inlet pipe are all provided with check valves.

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