An integrated purification tank with MBBR coupled with ammonia oxidation

Abstract

The present invention discloses an integrated purification tank for MBBR coupled with ammonia oxidation, comprising a horizontal shell, a water inlet and a water outlet respectively provided on the horizontal shell, at least two main partitions provided on the horizontal shell, the horizontal shell is divided into at least three compartments, an overflow port / water outlet is provided on the main partition to make the compartments communicate, characterized in that at least one compartment is an anaerobic biofilter bed area, at least one compartment is an MBBR area, at least one compartment is an anaerobic biofilm area, the anaerobic biofilter bed area is provided with a water inlet, the anaerobic biofilm area is provided with a water outlet, the anaerobic biofilter bed area is provided with a suspended filler and / or a soft filler, the MBBR area is provided with an aeration device, an MBBR filler and / or an MBR biofilm device, and a mixed liquor reflux device connected to the anaerobic biofilter bed area. The anaerobic biofilter bed area is filled with at least one biological filler to realize nitrification and denitrification reaction, short-range nitrification coupled with anaerobic ammonia oxidation reaction, and short-range denitrification coupled with anaerobic ammonia oxidation reaction.

Description

Technical Field

[0001] The invention belongs to the field of sewage treatment, and in particular to the field of rural sewage treatment. Background Art

[0002] Short-range nitrification-anaerobic ammonium oxidation combined mode

[0003] ① Two-stage

[0004] Two-stage features: less mutual interference, easy to achieve short-distance. If the operation is stable, research shows that the denitrification load can reach 11kg / (m3•d).

[0005] 1) Semi-short-cut nitrification + anaerobic ammonium oxidation: that is, the effluent in a reactor makes the ratio of ammonia nitrogen to nitrite 1:1.32, and then enters the anaerobic ammonium oxidation reactor for reaction.

[0006] 2) Short-term nitrification + raw water + anaerobic ammonium oxidation

[0007] ② Integration of short-term nitrification and anaerobic ammonium oxidation (i.e. short-term nitrification coupled with anaerobic ammonium oxidation):

[0008] That is, in the same reactor, AOB oxidizes part of the ammonia nitrogen into nitrite nitrogen, and the remaining ammonia nitrogen serves as a substrate for AnAOB to generate N2 denitrification process. The reaction equation is as follows:

[0009] NH4++1.5O2→NO2-+2H++H2O

[0010] NH4++1.32NO2-+0.066HCO3-+0.13H+→

[0011] 1.02N2+0.26NO3-+0.066CH2O0.5N0.15+2.03H2O

[0012] Characteristics of short-range nitrification coupled anaerobic ammonium oxidation: low cost, simple process, and generally integrated reactors are filled with fillers to form biofilms or cultivate granular sludge.

[0013] Short-range denitrification-anaerobic ammonium oxidation combined method

[0014] Integration (i.e. short-range denitrification coupled with anaerobic ammonium oxidation)

[0015] That is, in the same reactor, denitrifying bacteria reduce nitrate nitrogen to nitrite nitrogen, which, together with ammonia nitrogen, serves as a substrate for AnAOB to generate N2 in the denitrification process. The reaction equation is as follows (taking methanol as the carbon source as an example):

[0016] 3NO3-+CH3OH→3NO2-+CO2+2H2O

[0017] NH4++1.32NO2-+0.066HCO3-+0.13H+→

[0018] 1.02N2+0.26NO3-+0.066CH2O0.5N0.15+2.03H2O

[0019] The existing rural sewage treatment technology mostly adopts the activated sludge method. Under the condition of sufficient oxygen, microbial strains absorb organic matter in sewage and oxidize and decompose it to form carbon dioxide and water, a part of which is used for their own proliferation and reproduction, so that the activated sludge itself can multiply and grow, and the sewage can also be purified and treated. However, due to the unstable inlet and outlet of rural sewage, the total nitrogen, ammonia nitrogen and SS of the inlet water are too high, and the activated sludge cannot grow effectively, or even does not grow, resulting in poor removal of ammonia nitrogen and total nitrogen.

[0020] The market is in urgent need of a method to replace the activated sludge method for treating rural sewage, which can be applied to small septic tanks in rural areas with one to four households. Summary of the invention

[0021] The purpose of the present invention is to provide an integrated MBBR purification tank that can realize nitrification and denitrification reaction, short-range nitrification coupled anaerobic ammonia oxidation reaction, short-range denitrification coupled anaerobic ammonia oxidation reaction, etc. in a limited space, and efficiently treat SS, COD, ammonia nitrogen, total nitrogen, etc. of sewage, and finally truly achieve standard discharge.

[0022] To achieve the above-mentioned purpose of the invention, the technical solution of the present invention is: an integrated purification tank of MBBR coupled with ammonia oxidation, comprising a horizontal shell, a water inlet and a water outlet respectively opened on the horizontal shell, and at least two main partitions arranged on the horizontal shell, dividing the horizontal shell into at least three compartments, characterized in that at least one compartment is an anaerobic biofilter bed area, at least one compartment is an MBBR area, at least one compartment is an anaerobic biofilm area, a water inlet is arranged in the anaerobic biofilter bed area, a water outlet is arranged in the anaerobic biofilm area, suspended fillers and / or soft fillers are arranged in the anaerobic biofilter bed area, an aeration device, MBBR fillers and / or MBR biofilm devices, and a mixed liquor reflux device connected to the anaerobic biofilter bed area are arranged in the MBBR area.

[0023] Preferably, the anaerobic biofilm zone is filled with at least one biological filler.

[0024] Preferably, the water inlet is connected to the water inlet pipe and extends into the bottom end of the anaerobic biofilter bed area.

[0025] Preferably, the mixed liquor reflux device is an air lift reflux device, one end of the reflux pipe extends into the MBBR area, and the other end extends into the anaerobic biofilter bed area to connect to the water inlet pipe.

[0026] Preferably, the opening time of the aeration device in the MBBR area is less than the closing time, and the total aeration time in 24 hours a day is ≤18 hours.

[0027] Preferably, the anaerobic biofilter area is provided with mesh partitions to separate three chambers from bottom to top, namely, a primary anaerobic chamber, a secondary anaerobic biofilter chamber, and a third chamber, wherein the third chamber is filled with suspended filler, and the suspended filler is suspended with the liquid surface of the third chamber to form an oxygen-isolating suspended layer.

[0028] Preferably, one or more soft fillers are filled in the secondary anaerobic biofilter bed chamber, and the soft fillers filled in the secondary anaerobic biofilter bed chamber are pressed and fixed by the upper and lower mesh partitions. The soft fillers are pressed and fixed by the mesh partitions to form a fixed biobed area, which effectively performs complete anaerobic treatment, and greatly improves its service life because the fillers do not move.

[0029] Preferably, the MBBR filler in the MBBR zone is provided with at least one type, namely, a hard MBBR suspended filler and / or a spherical filler with a built-in sponge filler block and / or a spherical filler with a built-in hard MBBR filler and / or a spherical filler with a built-in bundled elastic filler.

[0030] Preferably, the biological filler in the anaerobic biofilm zone is a bundled elastic filler, and the bundled elastic filler is fixed by an integrated bracket.

[0031] Preferably, the main partition and the bottom of the horizontal shell are an integral injection-molded structure, wherein a water outlet is provided at the bottom of the main partition adjacent to the anaerobic biofilm zone and the MBBR zone.

[0032] Preferably, the aeration device and the return pipe of the mixed liquid return device in the MBBR zone are both provided with a control valve with a scale. The control valve with a scale can be a regulating control valve available on the market.

[0033] Preferably, the MBBR zone has at least one group of aeration devices.

[0034] Preferably, the aeration device in the MBBR zone is fixed by a tank bag at the bottom of the horizontal shell.

[0035] Preferably, the tank package and the bottom of the horizontal shell are integrally injection molded.

[0036] (1) The beneficial effects of the present invention are as follows: a multi-stage anaerobic reaction zone and a variety of fillers are arranged in the anaerobic biofilter area. The sewage first enters the first anaerobic chamber for sedimentation and complete anaerobic reaction. The sewage then rises to the second anaerobic biofilter chamber, where SS and part of the total nitrogen and ammonia nitrogen are removed through the internal ammonia oxidation sponge or other soft fillers. Since the entire chamber adopts a large amount of ammonia oxidation sponges or other soft fillers and adopts the form of semi-clamping and fixing of the mesh partition, the fillers will not move in the entire chamber, forming a complete anaerobic state. Moreover, the fillers are sponge blocks, and a large number of gaps will be formed between the sponge blocks, which are not easily blocked by impurities, thereby ensuring the flow state of the sewage. Then, the sewage rises to the third anaerobic chamber for further anaerobic reaction and then rises to the fourth anaerobic chamber. Since the fourth anaerobic chamber is covered with suspended fillers, the sealing effect of the third anaerobic chamber is ensured. At the same time, since these suspended fillers are in contact with the upper part of the oxygen, oxygen-limited conditions are formed, and part of NH4 is oxidized to nitrite by aerobic ammonia oxidizing bacteria, and then converted into nitrogen by anaerobic ammonia oxidizing bacteria.

[0037] (2) Two types of suspended fillers are set up in the MBBR area, one is a spherical filler with a built-in sponge filler block with a fast biofilm formation speed and a short service life, and the other is a hard MBBR suspended filler. The spherical filler with a built-in sponge filler block can form biofilm quickly and can complete biofilm formation within a three-month period, but its service life is short. The biofilm formation period of the hard MBBR suspended filler is long, but its service life is long, so that the biofilm formation period and use period of the two fillers form a high fault tolerance rate. In the early stage, the spherical filler of the sponge filler block is used for treatment. When the service life of the spherical filler of the sponge filler block ends, the biofilm formation of the hard MBBR suspended filler is completed, and continued use does not affect the biochemical reaction effect;

[0038] (3) Two independent aeration devices are set in the MBBR area. These aeration devices are equipped with adjustable control valves with scales. Through these adjustable control valves, the aeration devices will not be aerated evenly, and multiple irregular aeration areas will be formed, so as to realize the rotational flow of the filler in the MBBR area and form the MBBR fluidized bed effect. In addition, by setting the total aeration time of the MBBR area to ≤18 hours, a relatively anaerobic environment is achieved, realizing short-range nitrification and denitrification reactions.

[0039] (4) A mixed liquor return device is provided between the MBBR area and the anaerobic biofilter area. By returning the mixed liquor from the MBBR area to the anaerobic biofilter area, short-range denitrification coupled with anaerobic ammonium oxidation reaction can be achieved. In addition, since an adjustable control valve with a scale is provided on the mixed liquor return device, the return amount can be effectively controlled.

[0040] (5) By providing a water outlet at the bottom of the main partition adjacent to the anaerobic biofilm zone and the MBBR zone, the continuity of the water flow is effectively guaranteed, and short-circuiting will not occur, which will affect the sewage treatment effect.

[0041] (6) By setting a bundle of elastic fillers in the anaerobic biofilm area and fixing them with a bracket, the overall structure forms a fixed biofilter bed, which can effectively adsorb and filter SS while further removing total nitrogen and ammonia nitrogen through anaerobic ammonium oxidation.

[0042] (7) The main partition and the bottom of the horizontal shell are an integrated structure, and an integrated injection molding process is adopted. On the one hand, it is ensured that there will be no leakage between the compartments of the horizontal shell, which will affect the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

[0044] Figure 2 This is a schematic diagram of the structure of Example 2 of the present invention. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0046] Example 1: Figure 1As shown, an integrated purification tank for MBBR coupled with ammonia oxidation comprises a horizontal shell 1, a water inlet 2 and a water outlet 3 respectively provided on the horizontal shell 1, two main partitions arranged on the horizontal shell 1, a first partition 1.1 and a second partition 1.2, which divide the horizontal shell 1 into three sealed compartments, a first compartment 4 on the left is an anaerobic biofilter area, a second compartment 5 in the middle is an MBBR area, and a third compartment 6 on the right is an anaerobic biofilm area, a water inlet 2 is arranged near the top of the anaerobic biofilter area, and the water inlet 2 is connected to a water inlet pipe 2.1 extending into the anaerobic biofilter area. At the bottom of the biofilter area, a water outlet 3 is provided near the top of the anaerobic biofilm area. The first compartment 4 is divided into three chambers from bottom to top by two mesh partitions 7, which are the first-level anaerobic chamber 4.1, the second-level anaerobic biofilter chamber 4.2, and the third chamber 4.3. The second-level anaerobic biofilter chamber 4.2 is filled with irregular sponge filler 8, which is pressed and fixed as a whole by the upper and lower mesh partitions 7. The third chamber 4.3 is filled with suspended cosmic balls 9, which are suspended on the liquid surface of the third chamber 4.3 to form an oxygen-isolating suspension layer. The end of the water inlet pipe 2.1 is located in the first anaerobic chamber 4.1. An overflow port 1.1.1 is opened near the top of the first partition 1.1. The overflow port 1.1.1 is located in the third chamber 4.3. There are two kinds of MBBR fillers in the second compartment 5, one is a hard MBBR suspended filler 10, and the other is a spherical suspended filler 11 with a built-in sponge filler block. The second compartment 5 is provided with an aeration device 12 and a mixed liquid reflux device 13. The aeration device 12 includes an aeration pipe 12.1 and a fan 12.2 connected to the aeration pipe 12.1. The aeration pipe 12.1 is provided in two groups, and the aeration pipe is fixed by a horizontal shell bottom tank bag 15. Each aeration pipe 12.1 is provided with a scaled control valve 12.3. The mixed liquor reflux device 13 comprises a reflux pipe 13.1 and a fan 12.2. The reflux pipe 13.1 is provided with a scaled control valve 12.3. One end of the reflux pipe 13.1 extends into the MBBR area, and the other end extends into the anaerobic biofilter area to connect with the water inlet pipe 2.1. A water flow 1.2.1 is provided at the bottom of the second partition 1.2. The biological filler of the third compartment 6 is a bundle elastic filler 14, and the bundle elastic filler 14 is fixed by a bracket.

[0047] Embodiment 2, as Figure 2As shown, an integrated purification tank for MBBR coupled with ammonia oxidation comprises a horizontal shell 1, a water inlet 2 and a water outlet 3 respectively provided on the horizontal shell 1, and three main partitions arranged on the horizontal shell 1. The first partition 1.1, the second partition 1.2, and the third partition 1.3 divide the horizontal shell 1 into four sealed compartments. The first compartment 4 on the left is an anaerobic biofilter bed area, the second compartment 5 in the middle is an anaerobic biofilm 1 area, the third compartment 6 in the middle is an MBBR area, and the fourth compartment 7 on the right is an anaerobic biofilm 2 area. A water inlet 2 is arranged near the top of the anaerobic biofilter bed area, and the water inlet 2 is connected to The water inlet pipe 2.1 extends into the bottom end of the anaerobic biofilter bed area, and a water outlet 3 is arranged near the top of the anaerobic biofilm area 2. The first compartment 4 is divided into three chambers by two mesh partitions 8 from bottom to top, which are the first anaerobic chamber 4.1, the second anaerobic biofilter bed chamber 4.2, and the third chamber 4.3. The second anaerobic biofilter bed chamber 4.2 is filled with irregular sponge filler 9, and the irregular sponge filler 9 is pressed and fixed by the upper and lower mesh partitions 8 as a whole. The third chamber 4.3 is filled with suspended cosmic balls 10, and the suspended cosmic balls 10 are suspended on the liquid surface of the third chamber 4.3 to form an oxygen-isolating suspension layer. The end of the water inlet pipe 2.1 is located in the first anaerobic chamber 4.1. An overflow port 1.1.1 is opened near the top of the first partition 1.1. The overflow port 1.1.1 is located in the third chamber 4.3. There are two kinds of MBBR fillers in the third compartment 6, one is a hard MBBR suspended filler 11, and the other is a spherical suspended filler 12 with a built-in sponge filler block. The third compartment 6 is provided with an aeration device 13 and a mixed liquid reflux device 14. The aeration device 13 includes an aeration pipe 13.1 and a fan 13.2 connected to the aeration pipe 13.1. The aeration pipe 13.1 is arranged as a group, and the aeration pipe is fixed by a tank bag 16 at the bottom of the horizontal shell. A control valve 13.3 with scale is separately provided on the aeration pipe 13.1. The mixed liquor reflux device 14 comprises a reflux pipe 14.1 and a fan 13.2. A control valve 13.3 with scale is separately provided on the reflux pipe 14.1. One end of the reflux pipe 14.1 extends into the MBBR area, and the other end extends into the anaerobic biofilter area to connect with the water inlet pipe 2.1. An overflow port 1.2.1 is provided near the top of the second partition 1.2. A water outlet 1.3.1 is provided at the bottom of the third partition 1.3. The biological fillers of the second compartment 5 and the fourth compartment 7 are bundled elastic fillers 15, and the bundled elastic fillers 15 are fixed by a bracket.

[0048] The present invention provides a multi-stage anaerobic reaction zone and a variety of ammonia oxidation fillers, so that the sewage can undergo sufficient anaerobic ammonia oxidation reaction in the anaerobic biofilter bed zone, and the sewage flows into the MBBR zone to undergo a short-term aerobic aeration reaction to undergo a short-term nitrification and denitrification reaction, and part of the mixed liquid flows back to the anaerobic biofilter bed zone through a mixed liquid reflux device between the MBBR zone and the anaerobic biofilter bed zone to undergo a short-term denitrification coupled anaerobic ammonia oxidation reaction, and part of the mixed liquid flows into the anaerobic biofilm zone, and further undergoes an anaerobic ammonia oxidation reaction through the bundled elastic fillers in the anaerobic biofilm zone to remove total nitrogen and ammonia nitrogen, and the biofilter bed formed by the bundled elastic fillers has a good effect of removing SS, and finally the treated sewage is directly discharged through the outlet pipe or enters the next treatment process.

[0049] When this embodiment is in operation, the opening time of the aeration device in the MBBR area is less than the closing time, and the total aeration time within 24 hours is ≤18 hours.

[0050] In the above-mentioned embodiment 1, the main partitions 1.1 and 1.2 can be integrally formed with the horizontal casing 1 by injection molding or can be separately plugged into the horizontal casing 1.

[0051] In the above-mentioned embodiment 2, the main partitions 1.1, 1.2, 1.3 can be integrally formed with the horizontal shell 1 by injection molding, or can be separately plugged into the horizontal shell 1.

[0052] The technical key of the present invention is to change the existing idea of ​​using activated sludge method to treat rural sewage on the market, and adopt full anaerobic anaerobic ammonia oxidation reaction to treat rural sewage, create the most suitable conditions for anaerobic reaction in a limited space, and realize primary nitrification and denitrification reaction, secondary short-range nitrification coupled anaerobic ammonia oxidation reaction, and tertiary short-range denitrification coupled anaerobic ammonia oxidation reaction, so as to adapt to the problems of unstable inlet and outlet of rural sewage, excessive total nitrogen, ammonia nitrogen and SS in the inlet, inability of activated sludge to grow effectively, or even no growth, resulting in poor removal effect of ammonia nitrogen and total nitrogen.

[0053] The described embodiments are only some embodiments of the present invention, not all 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.

Claims

1. An integrated purification tank for MBBR coupled with ammonia oxidation, comprising a horizontal shell, a water inlet and a water outlet respectively provided on the horizontal shell, at least two main partitions provided on the horizontal shell, dividing the horizontal shell into at least three compartments, and an overflow port / water outlet provided on the main partition to connect the compartments, Features At least one of the chambers is an anaerobic biofilter area, at least one of the chambers is an MBBR area, and at least one of the chambers is an anaerobic biofilm area. The anaerobic biofilter area is provided with a water inlet, and the anaerobic biofilm area is provided with a water outlet. The anaerobic biofilter area is provided with suspended fillers and / or soft fillers, and the MBBR area is provided with an aeration device, MBBR fillers and / or MBR biofilm devices, and a mixed liquor reflux device connected to the anaerobic biofilter area. The anaerobic biofilter bed area is provided with a mesh partition to separate three chambers from bottom to top, which are the primary anaerobic chamber, the secondary anaerobic biofilter bed chamber, and the third chamber in sequence. The third chamber is filled with a suspended filler, and the suspended filler is suspended to form an oxygen-isolating suspended layer with the liquid surface of the third chamber. The secondary anaerobic biofilter bed chamber is filled with one or more soft fillers, and the soft fillers filled in the secondary anaerobic biofilter bed chamber are compressed and fixed as a whole by upper and lower mesh partitions to form a fixed biobed area.

2. An integrated purification tank for MBBR coupled with ammonia oxidation according to claim 1, It is characterized in that The anaerobic biofilm area is filled with at least one biological filler.

3. An integrated purification tank for MBBR coupled with ammonia oxidation according to claim 1, It is characterized in that The water inlet is connected to the water inlet pipe and extends into the bottom of the anaerobic biofilter bed area.

4. An integrated purification tank for MBBR coupled with ammonia oxidation according to claim 3, It is characterized in that The mixed liquor reflux device is an air lift reflux device, one end of the reflux pipe extends into the MBBR area, and the other end extends into the anaerobic biofilter bed area to connect to the water inlet pipe.

5. The integrated purification tank of MBBR coupled with ammonia oxidation according to claim 1, It is characterized in that The opening time of the aeration device in the MBBR area is less than the closing time, and the total aeration time within 24 hours a day is ≤18 hours.

6. An integrated purification tank for MBBR coupled with ammonia oxidation according to claim 1, It is characterized in that The MBBR fillers in the MBBR area are provided with at least one type, namely, hard MBBR suspended fillers and / or spherical fillers with built-in sponge filler blocks and / or spherical fillers with built-in hard MBBR fillers and / or spherical fillers with built-in bundled elastic fillers.

7. The integrated purification tank of MBBR coupled with ammonia oxidation according to claim 1, It is characterized in that The biological filler in the anaerobic biofilm zone is a bundle-shaped elastic filler, and the bundle-shaped elastic filler is fixed by an integrated bracket.

8. The integrated purification tank of MBBR coupled with ammonia oxidation according to claim 1, It is characterized in that The main partition and the bottom of the horizontal shell are an integral injection-molded structure, wherein a water outlet is provided at the bottom of the main partition adjacent to the anaerobic biofilm zone and the MBBR zone.

9. The integrated purification tank of MBBR coupled with ammonia oxidation according to claim 1, It is characterized in that The aeration device and the return pipe of the mixed liquid return device in the MBBR area are both equipped with control valves with scales.

10. The integrated purification tank of MBBR coupled with ammonia oxidation according to claim 1, It is characterized in that The aeration device in the MBBR area is fixed by a tank package at the bottom of the horizontal shell.

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