A combined upward split-flow multi-media biofilm reactor

Abstract

The present invention discloses a combined upward split multi-media biofilm reactor, comprising a reaction tank, at least two BAF reaction zones arranged at the lower part of the reaction tank, a matrix layer filled in the BAF reaction zone, a water inlet system and an aeration system sequentially distributed at the bottom of the BAF reaction zone, at least two mutually separated MBBR reaction zones arranged at the upper part of the reaction tank, a filler zone arranged in the MBBR reaction zone, and a water outlet trough arranged in the middle of the top of the reaction tank. The present invention can complete backwashing without stopping operation. The aeration device is designed as one for use and one for standby. Only one aeration device needs to be turned on for normal operation. When the multi-media biofilm needs to be backwashed, the two aeration devices are turned on at the same time, and the backwashing of the multi-media membrane is completed by air flushing. There is no need to select a large single aeration device due to backwashing, which causes unnecessary energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of biofilm reactors for sewage treatment, in particular to a combined upward shunt multi-media biofilm reactor. Background Art

[0002] Due to the limitations of local economy, technology, water use characteristics and other aspects in rural areas of my country, most rural areas have not taken effective treatment measures for domestic sewage. The wanton discharge and incomplete treatment of rural domestic sewage have caused damage to the water environment in some rural areas. Rural domestic sewage treatment is subject to the characteristics of rural domestic sewage and factors such as rural capital shortage, energy difficulties, and lack of technical personnel. At present, my country's rural population lives in a scattered manner, the sewage discharge is small, the discharge is dispersed, and the water quality and water quantity fluctuate greatly. A suitable sewage treatment process technology is needed.

[0003] At present, the common domestic sewage treatment processes in rural areas include activated sludge method, biofilm method and ecological method. In actual use, it is found that the activated sludge method requires high energy consumption and professional technical personnel to control, which is not suitable for rural areas where technical personnel are scarce; the pure ecological method treatment process generally occupies a large area, has a long hydraulic retention time, and has a low treatment efficiency. The land available for sewage treatment in some rural areas of my country is relatively limited, which has caused certain restrictions on the pure ecological method; the biofilm method relies more on facilities than on the control of process operating conditions, so the biofilm method is more suitable for the actual needs of rural domestic sewage treatment.

[0004] Therefore, we propose a combined upward split-flow multi-media biofilm reactor to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a combined upward split-flow multi-media biofilm reactor to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a combined upward split-flow multi-media biofilm reactor, comprising a reaction tank, and further comprising:

[0007] At least two BAF reaction zones disposed at the lower portion of the reaction tank;

[0008] A matrix layer filled in the BAF reaction zone;

[0009] A water inlet system and an aeration system are sequentially distributed at the bottom of the BAF reaction zone, wherein the water inlet system and the aeration system sequentially increase the water inlet amount and the aeration amount in the multiple BAF reaction zones;

[0010] At least two mutually separated MBBR reaction zones are arranged at the upper part of the reaction tank, and the MBBR reaction zones correspond to and are connected with the BAF reaction zones at the bottom one by one;

[0011] A packing area arranged in the MBBR reaction area;

[0012] and a water outlet trough arranged in the middle of the top of the reaction tank.

[0013] Preferably, the matrix layer is formed by mixing limestone with a particle size of 10 mm and zeolite with a particle size of 10 mm.

[0014] Preferably, the BAF reaction zone is divided into a first reaction zone and a second reaction zone, and the first reaction zone and the second reaction zone are horizontally separated and connected at the bottom.

[0015] Preferably, the water inlet system injects water into the first reaction zone and the second reaction zone in a ratio of 2:3, and the aeration system injects aeration into the first reaction zone and the second reaction zone in a ratio of 2:3.

[0016] Preferably, the MBBR reaction zone is divided into a third reaction zone and a fourth reaction zone, the third reaction zone is filled with large-particle fillers, the fourth reaction zone is filled with medium-particle fillers, and a partition is arranged between the third reaction zone and the fourth reaction zone, and the partition extends downward to the lower part of the first reaction zone and the second reaction zone.

[0017] Preferably, the water outlet trough is configured as a sawtooth-shaped water outlet trough, and the water outlet trough is fixedly installed in the middle of the top of the third reaction zone and the fourth reaction zone.

[0018] Preferably, the water inlet system is arranged below the substrate layer, and the water inlet system consists of two cross-arranged and connected water inlet pipes, a plurality of water inlets are distributed on the water inlet pipes, and the ratio of the number of water inlets located in the first reaction zone to the number of water inlets located in the second reaction zone is 2:3.

[0019] Preferably, the aeration system is located below the water inlet system, and is composed of an aeration main pipe and a plurality of aeration branch pipes which are parallel to each other and connected to the aeration main pipe, and aeration ports are evenly distributed on the aeration branch pipes. The ratio of the number of aeration branch pipes in the first reaction zone to the number of aeration branch pipes in the second reaction zone is 2:3.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention can complete backwashing without stopping operation. The aeration device is designed as one for use and one for standby. Only one aeration device is turned on for normal operation. When the multi-media biofilm needs to be backwashed, the two aeration devices are turned on at the same time, and the multi-media membrane is backwashed by air. There is no need to select a large single aeration device due to backwashing, resulting in unnecessary energy consumption.

[0022] The present invention uses limestone filler with a particle size of about 10 mm, and the height of the matrix layer filler is 1 / 3 of the operating water depth of the reactor. The filler height and particle size in the present invention can effectively prevent the filler layer from being blocked and is also conducive to backwashing the bottom layer.

[0023] The area above the matrix layer is divided into two reaction zones, which are filled with mobile biofilm carriers of different particle sizes and materials. The aeration intensity and flow rate are different, and they are divided into a micro-aeration, small flow, large particle size filler area and a strong aeration, medium flow, medium particle size filler area. The unique zoning design enhances the water purification capacity of the reactor.

[0024] The bottom layer of the device is equipped with a water inlet system and an aeration system. The water flows in from the bottom and out from the top. There will be no problem of sewage overflow in the reactor due to matrix blockage caused by water flow in from the top and out from the bottom. The bottom layer is the aeration system, and the upper layer has a water inlet pipe and a matrix layer of limestone and zeolite fillers. The aeration at the bottom layer promotes the rising of water flow while effectively preventing the blockage of the matrix layer, and the backwashing frequency is greatly reduced.

[0025] The present invention adopts a partition design, the first reaction zone and the second reaction zone are separated by a partition at the top and connected at the bottom, the third reaction zone and the fourth reaction zone are separated independently, and the outlet water is discharged through the middle zigzag outlet trough.

[0026] The aeration and water inlet flow rates of the first reaction zone and the third reaction zone are the same, the aeration and water inlet flow rates of the second reaction zone and the fourth reaction zone are the same, the first reaction zone and the third reaction zone are facultative aerobic zones, and the second reaction zone and the fourth reaction zone are aerobic zones, which effectively increase the removal rates of N and P. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of the reactor in the present invention;

[0028] Figure 2 It is a cross-sectional view of the bottom of the reactor in the present invention;

[0029] Figure 3 It is a schematic diagram of the water outlet tank in the present invention;

[0030] In the figure: 1. reaction tank; 101. first reaction zone; 102. second reaction zone; 103. third reaction zone; 104. fourth reaction zone; 2. filler zone; 201. large-particle filler; 202. medium-particle filler; 3. matrix layer; 4. aeration system; 41. aeration main pipe; 42. aeration branch pipe; 4201. aeration port; 5. water inlet system; 51. water inlet pipe; 52. water inlet; 6. partition; 7. water outlet trough. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0032] See also Figure 1-3The present invention provides a technical solution: a combined upward splitting multi-media biofilm reactor, comprising a reaction tank 1, at least two BAF reaction zones arranged at the lower part of the reaction tank 1, a matrix layer 3 filled in the BAF reaction zone, a water inlet system 5 and an aeration system 4 sequentially distributed at the bottom of the BAF reaction zone, at least two mutually separated MBBR reaction zones arranged at the upper part of the reaction tank 1, a filler zone 2 arranged in the MBBR reaction zone, and a water outlet trough 7 arranged in the middle of the top of the reaction tank 1.

[0033] In one embodiment of the present invention, the matrix layer 3 is a mixture of limestone with a particle size of 10 mm and zeolite with a particle size of 10 mm, and is located on the upper layer of the aeration system 4 and the water inlet system 5, and directly covers the aeration system 4 and the water inlet system 5. The packing height of the matrix layer 3 is 1 / 3 of the operating water depth of the reactor, which can effectively prevent the packing layer from being blocked and is also conducive to backwashing the bottom layer.

[0034] The sewage enters the BAF reaction zone at the bottom through the water inlet system 5, wherein the first reaction zone 101 is a micro-aerated biological filter aerobic and a small part of anaerobic biofilm filter, and the reaction zone 2 is a strong aerated biological filter aerobic biofilm filter. The BAF reaction zone first purifies the sewage and intercepts some suspended matter and some fine particles, and then further purifies the sewage through the two MBBR reaction zones (biofilm reactors) separated by the upper layer.

[0035] The MBBR reaction zones correspond to and are connected to the BAF reaction zones at the bottom. The water inlet and aeration volumes in the multiple BAF reaction zones are increased in sequence through the water inlet system 5 and the aeration system 4. This also ensures that the water inlet and aeration volumes in different MBBR reaction zones are different.

[0036] Furthermore, the BAF reaction zone is divided into a first reaction zone 101 and a second reaction zone 102, and the first reaction zone 101 and the second reaction zone 102 are horizontally separated and connected at the bottom.

[0037] The MBBR reaction zone is divided into a third reaction zone 103 and a fourth reaction zone 104. The third reaction zone 103 is filled with a large-particle filler 201, and the fourth reaction zone 104 is filled with a medium-particle filler 202. A partition 6 is arranged between the third reaction zone 103 and the fourth reaction zone 104, and the partition 6 extends downward to the lower part of the first reaction zone 101 and the second reaction zone 102.

[0038] In one embodiment of the present invention, the water inlet system 5 injects water into the first reaction zone 101 and the second reaction zone 102 at a ratio of 2:3, and the aeration system 4 injects aeration into the first reaction zone 101 and the second reaction zone 102 at a ratio of 2:3.

[0039] Due to different aeration intensities, the DO concentration of the effluent from the third reaction zone 103 is medium (facultative aerobic zone), and the DO concentration of the effluent from the fourth reaction zone 104 is relatively high (aerobic zone). The effluents from the third reaction zone 103 and the fourth reaction zone 104 are mixed together through the middle zigzag effluent trough 7, wherein the effluent trough 7 is fixedly installed in the middle of the top of the third reaction zone 103 and the fourth reaction zone 104.

[0040] The installation of the water inlet system 5 and the aeration system 4 in the present invention are as follows:

[0041] The water inlet system 5 is arranged below the substrate layer 3, and the water inlet system 5 is composed of two cross-arranged and connected water inlet pipes 51. A plurality of water inlets 52 are distributed on the water inlet pipes 51, and the ratio of the number of the water inlets 52 located in the first reaction zone 101 to the number of the water inlets 52 located in the second reaction zone 102 is 2:3.

[0042] The aeration system 4 is located below the water inlet system 5. The aeration system 4 is composed of an aeration main pipe 41 and a plurality of aeration branches 42 which are parallel to each other and connected to the aeration main pipe 41. The aeration branches 42 are evenly distributed with aeration ports 4201. The number ratio of the aeration branches 42 in the first reaction zone 101 to the aeration branches 42 in the second reaction zone 102 is 2:3. The aeration system 4 is used in one and in one standby mode. Only one fan is required for normal operation (there is no problem of selecting a larger aeration device due to backwashing, which causes excess energy loss). Backwashing is performed regularly (two fans are turned on at the same time) to prevent system blockage. Two fans are turned on at the same time for backwashing of the system. There is no additional backwashing unit and no need to add medicine. The multi-media biofilm can be backwashed by air flushing.

[0043] The high-concentration DO nitrification liquid and the medium-concentration DO nitrification liquid naturally mix and react, further reducing the nitrogen concentration in the sewage.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined upward split-flow multi-media biofilm reactor, comprising a reaction tank (1), characterized in that: Also includes, At least two BAF reaction zones are arranged at the bottom of the reaction pool (1); the BAF reaction zone is divided into a first reaction zone (101) and a second reaction zone (102); the first reaction zone (101) and the second reaction zone (102) are horizontally separated and connected at the bottom; A matrix layer (3) filled in the BAF reaction zone; A water inlet system (5) and an aeration system (4) are sequentially distributed at the bottom of the BAF reaction zone, wherein the water inlet system (5) and the aeration system (4) sequentially increase the water inlet amount and the aeration amount in the multiple BAF reaction zones; At least two mutually separated MBBR reaction zones are arranged at the upper part of the reaction tank (1), the MBBR reaction zones corresponding to and connected to the BAF reaction zones at the bottom; the MBBR reaction zones are divided into a third reaction zone (103) and a fourth reaction zone (104), the third reaction zone (103) is filled with a large-particle filler (201), the fourth reaction zone (104) is filled with a medium-particle filler (202), a partition (6) is arranged between the third reaction zone (103) and the fourth reaction zone (104), and the partition (6) extends downward to the lower part of the first reaction zone (101) and the second reaction zone (102); A packing zone (2) disposed within the MBBR reaction zone; And a water outlet trough (7) is arranged in the middle of the top of the reaction tank (1).

2. A combined upward split-flow multi-media biofilm reactor according to claim 1, characterized in that: The matrix layer (3) is a mixture of limestone with a particle size of 10 mm and zeolite with a particle size of 10 mm.

3. A combined upward split-flow multi-media biofilm reactor according to claim 1, characterized in that: The water inlet system (5) injects water into the first reaction zone (101) and the second reaction zone (102) at a ratio of 2:3, and the aeration system (4) injects aeration into the first reaction zone (101) and the second reaction zone (102) at a ratio of 2:

3.

4. A combined upward split-flow multi-media biofilm reactor according to claim 1, characterized in that: The water outlet trough (7) is configured as a sawtooth-shaped water outlet trough, and the water outlet trough (7) is fixedly installed in the middle of the top of the third reaction zone (103) and the fourth reaction zone (104).

5. A combined upward split-flow multi-media biofilm reactor according to claim 1, characterized in that: The water inlet system (5) is arranged below the substrate layer (3), and is composed of two cross-arranged and connected water inlet pipes (51), a plurality of water inlets (52) are distributed on the water inlet pipes (51), and the ratio of the number of the water inlets (52) located in the first reaction zone (101) to the number of the water inlets (52) located in the second reaction zone (102) is 2:

3.

6. A combined upward split-flow multi-media biofilm reactor according to claim 1, characterized in that: The aeration system (4) is located below the water inlet system (5). The aeration system (4) is composed of an aeration main pipe (41) and a plurality of aeration branch pipes (42) that are parallel to each other and connected to the aeration main pipe (41). Aeration ports (4201) are evenly distributed on the aeration branch pipes (42). The ratio of the number of aeration branch pipes (42) located in the first reaction zone (101) to the number of aeration branch pipes (42) located in the second reaction zone (102) is 2:3.

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