Rapid biofilm culturing method and equipment for membrane aeration biofilm reactor
By using nitrification carriers, nitrification-anaerobic ammonia oxidation carriers, and anaerobic ammonia oxidation carriers in stages, and controlling parameters such as hydraulic retention time and dissolved oxygen concentration, the problem of long biofilm attachment time in membrane aeration biofilm reactors was solved, achieving uniform, dense, and stable biofilm attachment and improving wastewater treatment efficiency.
Patent Information
- Application Number
- CN202511932093.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-03-20
AI Technical Summary
In existing membrane aeration biofilm reactors, the biofilm attachment time is too long, resulting in a loose biofilm that is easy to detach, thus affecting the wastewater treatment effect.
A phased biofilm formation method using nitrification carrier, nitrification-anaerobic ammonia oxidation carrier, and anaerobic ammonia oxidation carrier was adopted. By controlling parameters such as hydraulic retention time, dissolved oxygen concentration, and ammonia nitrogen concentration at different stages, a uniform, dense, and stable biofilm was formed.
Rapid biofilm formation was achieved, the total biofilm formation time was shortened, the biofilm attachment state was stabilized, and the wastewater treatment effect was improved.
Smart Images
Figure CN121698484A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water treatment, specifically to a method and equipment for rapid biofilm formation in a membrane aeration biofilm reactor. Background Technology
[0002] A membrane aeration biofilm reactor (MAB) is a device that uses hollow fiber membranes to achieve efficient oxygen transfer and combines it with biofilm technology to treat wastewater. Biofilm formation is the process of establishing a biofilm on the membrane module of the MAB, and its effectiveness directly affects the wastewater treatment efficiency of the reactor. In related technologies, the inoculum carrier and membrane module are placed in the same container and aerated to colonize the biofilm on the membrane module. A relatively long operating time is then used to ensure stable biofilm growth, thus completing biofilm formation. However, in these technologies, the biofilm formation time is often too long; shortening the time can lead to a loose biofilm structure and eventual detachment. Summary of the Invention
[0003] The present invention aims to at least partially solve one of the technical problems in the related art.
[0004] Therefore, embodiments of the present invention provide a method for rapid biofilm attachment in a membrane aeration biofilm reactor, and a device for rapid biofilm attachment in a membrane aeration biofilm reactor for implementing the method.
[0005] The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to embodiments of the present invention includes: The nitrification carrier and membrane module undergo the first stage of membrane attachment within the inoculation container; The nitrification-anaerobic ammonia oxidation carrier and the membrane module after the first stage of membrane attachment undergo a second stage of membrane attachment within the inoculation container; The anaerobic ammonia oxidation carrier and the membrane assembly after the second stage of membrane attachment undergo the third stage of membrane attachment within the inoculation container.
[0006] The rapid biofilm attachment method for a membrane-aerated biofilm reactor in this invention involves the sequential attachment of a nitrification carrier, a nitrification-anaerobic ammonium oxidation carrier, and an anaerobic ammonium oxidation carrier onto the membrane module in stages to form a biofilm on the surface of the membrane module. Each carrier has a relatively short attachment time, resulting in a shorter total biofilm attachment time. Furthermore, the biofilm adheres to the biofilm in a uniform, dense, and stable manner, and the target bacterial community structure of the biofilm is stable.
[0007] In some embodiments, during the first stage of membrane formation, the inoculation container continuously receives influent with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L, the mixed liquor in the inoculation container has a volatile suspended solids concentration of 8000 mg / L to 30000 mg / L, a dissolved oxygen concentration of 0.3 mg / L to 0.5 mg / L, a hydraulic retention time of 4 h to 6 h, and the membrane module continuously aerates the membrane. During the second stage of membrane formation, the inoculation container continuously receives influent with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L. The volatile suspended solids concentration of the mixed liquor in the inoculation container is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is 0.1 mg / L to 0.3 mg / L, the hydraulic retention time is 4 h to 6 h, and the membrane module is continuously aerated. During the third stage of biofilm formation, the inoculation container continuously receives water with an ammonia nitrogen concentration of 20 mg / L to 30 mg / L and a nitrite concentration of 30 mg / L to 40 mg / L. The volatile suspended solids concentration of the mixed solution in the inoculation container is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is ≤0.2 mg / L, and the hydraulic retention time is 4h to 6h.
[0008] In some embodiments, during the first stage of film attachment, the second stage of film attachment, and the third stage of film attachment, an aerator is provided in the inoculation container and aeration is continuously performed. The aerator uses an inert gas for aeration, while the membrane module uses oxygen or air for aeration.
[0009] In some embodiments, the first stage of membrane attachment continues until the ammonia nitrogen removal rate of the membrane module is 50%–80% and the nitrite accumulation rate of the effluent from the inoculation container is 85%–100%; and / or The first stage of biofilm formation lasts for 2 to 4 days.
[0010] In some embodiments, the total nitrogen removal rate of the membrane module during the second stage of membrane attachment is 40%–70%; and / or The second stage of biofilm formation lasts for 2 to 4 days.
[0011] In some embodiments, the total nitrogen removal rate of the membrane module during the third stage of membrane attachment is 70%–85%; and / or The third stage of biofilm formation lasts for 2 to 4 days.
[0012] In some embodiments, the inoculation container is emptied after the first stage of membrane attachment, and then the second stage of membrane attachment is performed; the inoculation container is emptied after the second stage of membrane attachment, and then the third stage of membrane attachment is performed; or The inoculation container includes a first inoculation container, a second inoculation container, and a third inoculation container. The membrane assembly can move between the first inoculation container, the second inoculation container, and the third inoculation container. The membrane assembly performs the first stage of membrane attachment when it is in the first inoculation container, the second stage of membrane attachment when it is in the second inoculation container, and the third stage of membrane attachment when it is in the third inoculation container.
[0013] In some embodiments, the rapid biofilm attachment method for the membrane aeration biofilm reactor further includes: Before the first stage of biofilm formation, the nitrite carrier is aerated in the inoculation container or pretreatment container for pretreatment. The nitrite-anaerobic ammonia oxidation carrier is aerated in the pretreatment container for pretreatment before the second stage of biofilm formation. The anaerobic ammonia oxidation carrier is pretreated by aeration in the pretreatment container before the third stage of biofilm formation.
[0014] In some embodiments, the pretreatment time for the nitrification carrier, the nitrification-anaerobic ammonium oxidation carrier, and the anaerobic ammonium oxidation carrier is 1 day to 2 days; and / or During the pretreatment process, the aeration gas of the aerator is an inert gas.
[0015] In some embodiments, the rapid biofilm attachment method for the membrane aeration biofilm reactor further includes: After the membrane is attached in the third stage, the membrane module is moved into the reinforcement container, where the first stage of reinforcement and the second stage of reinforcement are carried out in sequence. During the first stage of reinforcement, the reinforcement container continuously adds a reinforcing agent, and stops adding the reinforcing agent after the first stage of reinforcement.
[0016] In some embodiments, during the first and second stages of enhancement, the enhancement container continuously receives influent with an ammonia nitrogen concentration of 40 mg / L to 70 mg / L, and the dissolved oxygen concentration within the enhancement container is 0.1 mg / L to 0.2 mg / L; and / or After the addition of the enhancer, the concentration of the enhancer in the enhancer container is 5 mg / L to 10 mg / L.
[0017] In some embodiments, the first stage of enhancement continues until the total nitrogen removal rate of the membrane module with attached membrane is 80%–90%; and / or The first stage of intensive treatment lasts for 4 to 8 days.
[0018] In some embodiments, the second stage enhancement continues until the total nitrogen removal rate of the membrane module with attached membrane is 85%–95%; and / or The second phase of intensive treatment lasts for 10 to 20 days.
[0019] In some embodiments, the reinforcing agent is NH2OH; and / or The reinforced container is a water treatment container.
[0020] The rapid biofilm attachment device for a membrane aeration biofilm reactor according to embodiments of the present invention is used to implement the rapid biofilm attachment method for a membrane aeration biofilm reactor described in any of the above embodiments, including: The membrane module and inoculation container, the inoculation container including a first inoculation container, a second inoculation container and a third inoculation container, the membrane module being movable between the first inoculation container, the second inoculation container and the third inoculation container, the first inoculation container being used to contain the membrane module and the nitrification carrier for a first stage of membrane attachment, the second inoculation container being used to contain the membrane module and the nitrification-anammox carrier for a second stage of membrane attachment, and the third inoculation container being used to contain the membrane module and the anammox carrier for a third stage of membrane attachment.
[0021] The rapid biofilm attachment device for the membrane aeration biofilm reactor of this invention can implement the rapid biofilm attachment method of the membrane aeration biofilm reactor of this invention to form a uniform, dense and stable biofilm on the surface of the membrane module, and the total biofilm attachment time is relatively short.
[0022] In some embodiments, the rapid biofilm attachment device for the membrane aeration biofilm reactor further includes: an air supply device, a first air supply pipe and a second air supply pipe, wherein multiple membrane modules are configured, the first air supply pipe is connected between the air supply device and the air inlet end of the membrane module located in the first inoculation container, and the second air supply pipe is connected between the exhaust end of the membrane module located in the first inoculation container and the air inlet end of the membrane module located in the second inoculation container.
[0023] In some embodiments, the rapid biofilm attachment device for the membrane aeration biofilm reactor further includes: an aeration pipe and a plurality of aerators, wherein the aerators are provided in the first inoculation container, the second inoculation container and the third inoculation container, the aeration pipe has an inlet and a plurality of outlets, the inlet of the aeration pipe is connected to the air outlet of the membrane module located in the second inoculation container, and the aerators in the first inoculation container, the second inoculation container and the third inoculation container are respectively connected to the corresponding outlets of the aeration pipe.
[0024] In some embodiments, the rapid biofilm attachment device for the membrane aeration biofilm reactor further includes: an ammonia nitrogen supply device and a nitrous oxide supply device, wherein the ammonia nitrogen supply device is connected to the first inoculation container, the second inoculation container and the third inoculation container, and the nitrous oxide supply device is connected to the third inoculation container. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of a rapid biofilm attachment device for a membrane aeration biofilm reactor according to an embodiment of the present invention.
[0026] Figure label: 1. Membrane module; 2. Inoculation container; 21. First inoculation container; 22. Second inoculation container; 23. Third inoculation container; 3. Aerator; 4. Air supply device; 5. First air supply pipe; 6. Second air supply pipe; 7. Aeration pipe; 8. Ammonia nitrogen supply device; 81. Ammonia nitrogen container; 82. Ammonia nitrogen pipeline; 9. Nitrous oxide supply device; 91. Nitrous oxide container; 92. Nitrous oxide pipeline. Detailed Implementation
[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0028] The following is for reference. Figure 1 A method and apparatus for rapid biofilm attachment in a membrane aeration biofilm reactor according to embodiments of the present invention are described.
[0029] like Figure 1 As shown, the rapid biofilm attachment method for a membrane aeration biofilm reactor according to an embodiment of the present invention includes a first-stage biofilm attachment of a nitrification carrier and a membrane module 1 in an inoculation container 2, a second-stage biofilm attachment of a nitrification-anaerobic ammonia oxidation carrier and a membrane module 1 after the first-stage biofilm attachment in an inoculation container 2, and a third-stage biofilm attachment of an anaerobic ammonia oxidation carrier and a membrane module 1 after the second-stage biofilm attachment in an inoculation container 2.
[0030] The rapid biofilm attachment method for a membrane aeration biofilm reactor in this embodiment of the invention involves the sequential attachment of a nitrification carrier, a nitrification-anaerobic ammonium oxidation carrier, and an anaerobic ammonium oxidation carrier onto the membrane module 1 in stages to form a biofilm on the surface of the membrane module 1. Each carrier has a relatively short attachment time, resulting in a shorter total biofilm attachment time. Furthermore, the biofilm adheres to the biofilm in a uniform, dense, and stable manner, and the target bacterial community structure of the biofilm is stable.
[0031] In some embodiments, during the first stage of membrane formation, the inoculation container 2 continuously receives influent with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L, preferably 30 mg / L, 40 mg / L, or 50 mg / L. The volatile suspended solids concentration of the mixed liquor in the inoculation container 2 is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is 0.3 mg / L to 0.5 mg / L, and the hydraulic retention time is 4 h to 6 h. The volatile suspended solids concentration of the mixed liquor is preferably 8000 mg / L, 16000 mg / L, 22000 mg / L, or 30000 mg / L, the dissolved oxygen concentration is preferably 0.3 mg / L, 0.4 mg / L, or 0.5 mg / L, and the hydraulic retention time is preferably 4 h, 5 h, or 6 h. The membrane module 1 continuously aerates the membrane, and the aeration gas is preferably, but not limited to, oxygen or air. The first stage of biofilm formation is completed by allowing the nitrifying carrier to colonize the surface of membrane module 1 and form a first biofilm layer, wherein the first biofilm layer grows in a uniform and dense state. The nitrifying carrier is preferably, but not limited to, partially nitrified flocculent sludge.
[0032] In some embodiments, during the second stage of membrane formation, the inoculation container 2 continuously receives influent with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L, preferably 30 mg / L, 40 mg / L, or 50 mg / L. The volatile suspended solids concentration of the mixed liquor in the inoculation container 2 is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is 0.1 mg / L to 0.3 mg / L, and the hydraulic retention time is 4 h to 6 h. The volatile suspended solids concentration of the mixed liquor is preferably 8000 mg / L, 16000 mg / L, 22000 mg / L, or 30000 mg / L, the dissolved oxygen concentration is preferably 0.1 mg / L, 0.2 mg / L, or 0.3 mg / L, and the hydraulic retention time is preferably 4 h, 5 h, or 6 h. The membrane module 1 continuously aerates the membrane, and the aeration gas is preferably, but not limited to, oxygen or air. The second biofilm layer is formed by colonizing the nitrification-anammox carrier on membrane module 1. The second biofilm layer preferably, but not limited to, covers the first biofilm layer. The second biofilm layer grows uniformly and densely, thus completing the second stage of biofilm formation. The nitrification-anammox carrier is preferably, but not limited to, an integrated PN / A inoculum carrier, and more preferably, an integrated PN / A flocculent sludge.
[0033] In some embodiments, during the third stage of biofilm formation, the inoculation container 2 continuously receives influent with an ammonia nitrogen concentration of 20 mg / L to 30 mg / L and a nitrite concentration of 30 mg / L to 40 mg / L. The preferred ammonia nitrogen concentrations are 20 mg / L, 35 mg / L, and 30 mg / L, and the preferred nitrite concentrations are 30 mg / L, 35 mg / L, and 40 mg / L. The volatile suspended solids concentration of the mixed liquor in the inoculation container 2 is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is ≤0.2 mg / L, and the hydraulic retention time is 4 h to 6 h. The preferred volatile suspended solids concentrations of the mixed liquor are 8000 mg / L, 16000 mg / L, 22000 mg / L, and 30000 mg / L, the preferred dissolved oxygen concentrations are 0 mg / L, 0.1 mg / L, and 0.2 mg / L, and the preferred hydraulic retention times are 4 h, 5 h, and 6 h. The anammox carrier is allowed to colonize the membrane module 1 and form a third biofilm layer. This third biofilm layer preferably, but not limited to, covers the second biofilm layer. The third biofilm layer grows into a uniform and dense state, thus completing the third stage of biofilm formation and forming a uniform, dense, and stable biofilm. In other words, the biofilm includes a first biofilm layer formed by a nitrification carrier, a second biofilm layer formed by a nitrification-anammox carrier, and a third biofilm layer formed by an anammox carrier. The anammox carrier is preferably, but not limited to, anammox flocculent sludge.
[0034] In some embodiments, during the first, second, and third stages of biofilm formation, an aerator 3 is installed in the inoculation container 2 and continuously aerated. The aeration gas from the aerator 3 is an inert gas. Aeration by the aerator 3 ensures that the nitrification carrier, nitrification-anaerobic ammonium oxidation carrier, and anaerobic ammonium oxidation carrier are all in full contact with the membrane module 1. The aeration also creates hydraulic shear force to increase the hydrophobicity of the carrier, thereby promoting biofilm formation. Simultaneously, the scouring effect of the aeration makes the carrier attached to the membrane module 1 more compact, preventing the carrier and biofilm from detaching. The aerator 3 is preferably, but not limited to, an aeration disc, and the aeration gas is preferably, but not limited to, nitrogen or air discharged after being supplied to the membrane module 1, wherein the oxygen in the air is consumed as it passes through the membrane module 1.
[0035] In some embodiments, the first stage of biofilm formation continues until the ammonia nitrogen removal rate of membrane module 1 is 50%–80% and the nitrite accumulation rate of the effluent from inoculation container 2 is 85%–100%. The preferred ammonia nitrogen removal rates are 50%, 65%, and 80%, and the preferred nitrite accumulation rates are 85%, 93%, and 100%. During the first stage of biofilm formation, the completion of the first stage is determined by detecting the ammonia nitrogen removal rate of membrane module 1 and the nitrite accumulation rate of the effluent from inoculation container 2.
[0036] It is understandable that whether the first stage of biofilm formation is complete is not limited to judging by the ammonia nitrogen removal rate of membrane module 1 and the nitrite accumulation rate of the effluent from inoculation container 2.
[0037] In other embodiments, the first stage of biofilm formation lasts for 2 to 4 days, preferably 2, 3, or 4 days. When the first stage of biofilm formation lasts for 2 to 4 days, the ammonia nitrogen removal rate of membrane module 1 is 50% to 80% and the nitrite accumulation rate of the effluent from inoculation container 2 is 85% to 100%, because the duration of the first stage of biofilm formation can also be used to determine whether the first stage of biofilm formation is complete.
[0038] Understandably, the completion of the first-stage biofilm formation can also be determined by the duration of the first-stage biofilm formation, the ammonia nitrogen removal rate of membrane module 1, and the nitrite accumulation rate in the effluent of inoculation container 2.
[0039] In some embodiments, the second-stage membrane attachment continues until the total nitrogen removal rate of membrane module 1 is 40% to 70%, preferably 40%, 55%, or 70%. During the second-stage membrane attachment, the completion of the second-stage membrane attachment is determined by detecting the total nitrogen removal rate of membrane module 1.
[0040] It is understandable that whether the second stage of membrane attachment is completed is not limited to judging by the total nitrogen removal rate of membrane module 1.
[0041] In other embodiments, the second-stage biofilm formation lasts for 2 to 4 days, preferably 2, 3, or 4 days. When the second-stage biofilm formation lasts for 2 to 4 days, the total nitrogen removal rate of membrane module 1 is 40% to 70%, so the duration of the second-stage biofilm formation can also be used to determine whether the second-stage biofilm formation is complete.
[0042] Understandably, the completion of the second-stage biofilm formation can also be determined by the duration of the second-stage biofilm formation and the total nitrogen removal rate of membrane module 1.
[0043] In some embodiments, the third stage of membrane attachment continues until the total nitrogen removal rate of membrane module 1 is 70% to 85%, preferably 70%, 77%, or 85%. During the third stage of membrane attachment, the completion of the third stage of membrane attachment is determined by detecting the total nitrogen removal rate of membrane module 1.
[0044] It is understandable that whether the third stage of membrane attachment is completed is not limited to judging by the total nitrogen removal rate of membrane module 1.
[0045] In other embodiments, the third-stage biofilm formation lasts for 2 to 4 days, preferably 2, 3, or 4 days. When the third-stage biofilm formation lasts for 2 to 4 days, the total nitrogen removal rate of membrane module 1 is 70% to 85%, so the duration of the third-stage biofilm formation can also be used to determine whether the third-stage biofilm formation is complete.
[0046] Understandably, the completion of the third-stage biofilm formation can also be determined by the duration of the third-stage biofilm formation and the total nitrogen removal rate of membrane module 1.
[0047] In some embodiments, after the inoculation container 2 is attached to the membrane in the first stage, it is emptied, and then the second stage of membrane attachment is performed. After the second stage of membrane attachment, the inoculation container 2 is emptied, and then the third stage of membrane attachment is performed. Specifically, during the first, second, and third stages of membrane attachment, the membrane module 1 is always located inside the inoculation container 2. The inoculation container 2 must be emptied after each stage of membrane attachment is completed to avoid the carrier of the membrane attached in the previous stage, the ammonia nitrogen concentration, nitrite concentration, volatile suspended solids concentration of the mixed solution, and dissolved oxygen concentration affecting the membrane attachment in the subsequent stage.
[0048] The first, second, and third stages of membrane attachment are carried out sequentially and cyclically within the inoculation container 2.
[0049] It is understandable that membrane module 1 is not limited to being located inside inoculation container 2 during the first, second, and third stages of membrane attachment.
[0050] In another embodiment, the inoculation container 2 includes a first inoculation container 21, a second inoculation container 22, and a third inoculation container 23. The membrane assembly 1 is movable between the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23. The membrane assembly 1 performs a first-stage membrane attachment when in the first inoculation container 21, a second-stage membrane attachment when in the second inoculation container 22, and a third-stage membrane attachment when in the third inoculation container 23. Specifically, as... Figure 1 As shown, the nitrification carrier is added to the first inoculation container 21, the nitrification-anaerobic ammonia oxidation carrier is added to the second inoculation container 22, and the anaerobic ammonia oxidation carrier is added to the third inoculation container 23. The membrane module 1 is first placed in the first inoculation container 21 for the first stage of biofilm formation. After the first stage of biofilm formation is completed, the membrane module 1 is removed from the first inoculation container 21 and placed in the second inoculation container 22. Then, the membrane module 1 undergoes the second stage of biofilm formation in the second inoculation container 22. After the second stage of biofilm formation is completed, the membrane module 1 is removed from the second inoculation container 22 and placed in the third inoculation container 23. Then, the membrane module 1 undergoes the third stage of biofilm formation in the third inoculation container 23, thereby forming a biofilm.
[0051] The first inoculation container 21 continuously receives influent with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L. The mixed liquor in the first inoculation container 21 has a volatile suspended solids concentration of 8000 mg / L to 30000 mg / L, a dissolved oxygen concentration of 0.3 mg / L to 0.5 mg / L, and a hydraulic retention time of 4 h to 6 h. The membrane module 1 is continuously aerated in the first inoculation container 21.
[0052] The second inoculation container 22 continuously receives influent with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L. The volatile suspended solids concentration of the mixed liquor in the second inoculation container 22 is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is 0.1 mg / L to 0.3 mg / L, and the hydraulic retention time is 4 h to 6 h. The membrane module 1 is continuously aerated in the second inoculation container 22.
[0053] The third inoculation container 23 continuously receives influent with an ammonia nitrogen concentration of 20 mg / L to 30 mg / L and a nitrite concentration of 30 mg / L to 40 mg / L. The volatile suspended solids concentration of the mixed liquor in the third inoculation container 23 is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is ≤0.2 mg / L, and the hydraulic retention time is 4h to 6h.
[0054] Furthermore, the first inoculation container 21, the second inoculation container 22 and the third inoculation container 23 are all equipped with aerators 3 for aeration.
[0055] Furthermore, membrane module 1 can be configured as one and cyclically move between the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23. Membrane module 1 can also be configured as two or more. In the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23, after the first membrane module 1 is taken out, the next membrane module 1 is put in. At this time, the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23 do not need to be emptied, but the corresponding carrier needs to be added according to the insertion of membrane module 1.
[0056] In some embodiments, the rapid biofilm attachment method for a membrane aeration biofilm reactor further includes pretreatment of the nitrification carrier by aeration in the inoculation container 2 or pretreatment container before the first stage of biofilm attachment, pretreatment of the nitrification-anammox carrier by aeration in the pretreatment container by aeration in the pretreatment container by aeration in the second stage of biofilm attachment, and pretreatment of the anammox carrier by aeration in the pretreatment container by aeration in the pretreatment container by aeration in the third stage of biofilm attachment.
[0057] Specifically, the nitrification carrier, nitrification-anaerobic ammonium oxidation carrier, and anaerobic ammonium oxidation carrier can be aerated in the pretreatment container by the aerator 3 in the pretreatment container before the first stage of biofilm formation, so as to be pretreated at the same time. Then, they are added sequentially to the inoculation container 2, which is set as one, or respectively added to the corresponding first inoculation container 21, second inoculation container 22, and third inoculation container 23.
[0058] The pretreatment container equipped with aerator 3 can also pretreat the nitrification carrier and supply it to an inoculation container or a first inoculation container 21. The pretreatment container pretreats the nitrification-anammox carrier during the first stage of biofilm formation and adds it to an inoculation container 2 or a second inoculation container 22 after the first stage of biofilm formation is completed. The pretreatment container pretreats the anammox carrier during the second stage of biofilm formation and adds it to an inoculation container 2 or a third inoculation container 23 after the second stage of biofilm formation is completed.
[0059] Furthermore, the pretreatment container pretreats the nitrification carrier during the third stage of biofilm formation, so that it can be added to the inoculation container 2 or the first inoculation container 21 after the third stage of biofilm formation is completed.
[0060] The pretreatment container equipped with aerator 3 can also pretreat the nitrification-anaerobic ammonium oxidation carrier and the anaerobic ammonium oxidation carrier simultaneously or sequentially. Before the first stage of biofilm formation, the nitrification carrier is pretreated in an inoculation container 2 or a first inoculation container 21. At this time, the membrane module 1 is not placed in the inoculation container 2 or the first inoculation container 21.
[0061] The aerator 3 used for pretreatment is preferably, but not limited to, an aeration disc. During the pretreatment process, the aeration gas of the aerator 3 is an inert gas, preferably, but not limited to, nitrogen.
[0062] During the pretreatment process, aeration generates hydraulic shear force, which causes the carrier to secrete more extracellular polymers to enhance hydrophobicity. This facilitates rapid biofilm formation on the carrier at the corresponding stage, thereby shortening the biofilm formation time.
[0063] In some embodiments, the pretreatment time for the nitrification carrier, the nitrification-anaerobic ammonium oxidation carrier, and the anaerobic ammonium oxidation carrier is 1 to 2 days, preferably 1 day, 1.5 days, and 2 days, to ensure that the nitrification carrier, the nitrification-anaerobic ammonium oxidation carrier, and the anaerobic ammonium oxidation carrier have sufficient hydrophobicity after pretreatment.
[0064] In some embodiments, the rapid membrane attachment method for a membrane-aerated biofilm reactor further includes moving the membrane module 1 after the third stage of membrane attachment into an enhancement container, and sequentially performing a first stage of enhancement and a second stage of enhancement in the enhancement container. During the first stage of enhancement, the enhancement container continuously adds a strengthening agent, and stops adding the strengthening agent after the first stage of enhancement.
[0065] Specifically, after the membrane module 1 is attached in the third stage, it is taken out by an inoculation container 2 or a third inoculation container 23, and then placed in a strengthening container for the first and second stage strengthening in sequence. In the first stage strengthening, the autotrophic denitrification performance of aerobic and anaerobic ammonia oxidizing bacteria in the biofilm is enhanced by a strengthening agent. In the second stage strengthening, the membrane module 1 with biofilm on its surface is further enhanced in denitrification performance through continuous operation for a period of time, so as to be able to carry out water treatment that meets the pollutant discharge requirements.
[0066] The preferred, but not limited, reinforcing agent is NH2OH.
[0067] In some embodiments, during the first and second stages of enhancement, the influent ammonia nitrogen concentration in the enhancement container is continuously maintained at 40 mg / L to 70 mg / L, preferably 40 mg / L, 55 mg / L, or 70 mg / L, and the dissolved oxygen concentration in the enhancement container is maintained at 0.1 mg / L to 0.2 mg / L, preferably 0.1 mg / L, 0.15 mg / L, or 0.2 mg / L. This ensures that the enhancer fully acts on the biofilm and promotes its continuous and stable growth, thereby completing the first and second stages of enhancement.
[0068] In some embodiments, after adding the fortifying agent, the concentration of the fortifying agent in the fortification container is 5 mg / L to 10 mg / L, preferably 5 mg / L, 7 mg / L, or 10 mg / L. This is to ensure that the fortifying agent sufficiently enhances the autotrophic denitrification performance of aerobic and anaerobic ammonia-oxidizing bacteria in the biofilm, thereby completing the first stage of fortification.
[0069] In some embodiments, the first stage of enhancement continues until the total nitrogen removal rate of the membrane module 1 with attached membrane is 80% to 90%, preferably 80%, 85%, or 90%. During the first stage of enhancement, the completion of the first stage of enhancement is determined by detecting the total nitrogen removal rate of the membrane module 1 with attached membrane in the enhancement container.
[0070] It is understandable that whether the first stage of enhancement is completed is not limited to judging by the total nitrogen removal rate of membrane module 1 with membrane attached inside the enhanced container.
[0071] In other embodiments, the first stage of enhancement lasts for 4 to 8 days, preferably 4, 7, or 8 days. When the first stage of enhancement lasts for 4 to 8 days, the total nitrogen removal rate of the membrane module 1 with the membrane attached in the enhancement container is 80% to 90%. Therefore, the duration of the first stage of enhancement can also be used to determine whether the first stage of enhancement is complete.
[0072] Understandably, the completion of the first-stage enhancement can also be determined by the duration of the first-stage enhancement and the total nitrogen removal rate of membrane module 1 with membrane attached in the enhancement container.
[0073] In some embodiments, the second-stage enhancement continues until the total nitrogen removal rate of the membrane module 1 with attached membrane is 85% to 95%, preferably 85%, 90%, or 95%. During the second-stage enhancement, the completion of the second-stage enhancement is determined by detecting the total nitrogen removal rate of the membrane module 1 with attached membrane in the enhancement container.
[0074] It is understandable that whether the second stage of enhancement is completed is not limited to judging by the total nitrogen removal rate of membrane module 1 with membrane attached inside the enhanced container.
[0075] In other embodiments, the second-stage enhancement lasts for 10 to 20 days, preferably 10, 15, or 20 days. When the second-stage enhancement lasts for 10 to 20 days, the total nitrogen removal rate of the membrane module 1 with the membrane attached in the enhancement container is 85% to 95%. Therefore, the duration of the second-stage enhancement can also be used to determine whether the second-stage enhancement is complete.
[0076] Understandably, the completion of the second-stage enhancement can also be determined by the duration of the second-stage enhancement and the total nitrogen removal rate of membrane module 1 with membrane attached inside the enhancement container.
[0077] In some embodiments, the enhanced container is a water treatment container, which is preferably, but not limited to, a wastewater treatment reactor. After the membrane module 1 after the third stage of membrane attachment is placed in the water treatment container and the first stage of enhancement and the second stage of enhancement are carried out in sequence, there is no need to remove the membrane module 1. The water to be treated can be directly supplied to the water treatment container to start water treatment.
[0078] The following is for reference. Figure 1 This invention describes a rapid biofilm attachment device for a membrane-aerated biofilm reactor according to an embodiment of the present invention. The rapid biofilm attachment device for a membrane-aerated biofilm reactor according to the embodiments of the present invention is used to implement the rapid biofilm attachment method for a membrane-aerated biofilm reactor according to the embodiments of the present invention.
[0079] like Figure 1 As shown, the rapid biofilm attachment device for the membrane aeration biofilm reactor of this invention includes a membrane module 1 and an inoculation container 2.
[0080] The inoculation container 2 includes a first inoculation container 21, a second inoculation container 22, and a third inoculation container 23. The membrane module 1 can move between the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23. The first inoculation container 21 is used to contain the membrane module 1 and the nitrification carrier for the first stage of membrane attachment. The second inoculation container 22 is used to contain the membrane module 1 and the nitrification-anaerobic ammonium oxidation carrier for the second stage of membrane attachment. The third inoculation container 23 is used to contain the membrane module 1 and the anaerobic ammonium oxidation carrier for the third stage of membrane attachment.
[0081] Specifically, such as Figure 1As shown, the nitrification carrier is added to the first inoculation container 21, the nitrification-anaerobic ammonia oxidation carrier is added to the second inoculation container 22, and the anaerobic ammonia oxidation carrier is added to the third inoculation container 23. The membrane module 1 is first placed in the first inoculation container 21 for the first stage of biofilm formation. After the first stage of biofilm formation is completed, the membrane module 1 is removed from the first inoculation container 21 and placed in the second inoculation container 22. Then, the membrane module 1 undergoes the second stage of biofilm formation in the second inoculation container 22. After the second stage of biofilm formation is completed, the membrane module 1 is removed from the second inoculation container 22 and placed in the third inoculation container 23. Then, the membrane module 1 undergoes the third stage of biofilm formation in the third inoculation container 23, thereby forming a biofilm.
[0082] The rapid biofilm attachment device for the membrane aeration biofilm reactor of this invention can implement the rapid biofilm attachment method of the membrane aeration biofilm reactor of this invention to form a uniform, dense and stable biofilm on the surface of the membrane module 1, and the total biofilm attachment time is relatively short.
[0083] In some embodiments, the first inoculation container 21 continuously receives influent with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L, the mixed liquor in the first inoculation container 21 has a volatile suspended solids concentration of 8000 mg / L to 30000 mg / L, a dissolved oxygen concentration of 0.3 mg / L to 0.5 mg / L, and a hydraulic retention time of 4 h to 6 h, and the membrane module 1 is continuously aerated in the first inoculation container 21.
[0084] The second inoculation container 22 continuously receives influent with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L. The volatile suspended solids concentration of the mixed liquor in the second inoculation container 22 is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is 0.1 mg / L to 0.3 mg / L, and the hydraulic retention time is 4 h to 6 h. The membrane module 1 is continuously aerated in the second inoculation container 22.
[0085] The third inoculation container 23 continuously receives influent with an ammonia nitrogen concentration of 20 mg / L to 30 mg / L and a nitrite concentration of 30 mg / L to 40 mg / L. The volatile suspended solids concentration of the mixed liquor in the third inoculation container 23 is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is ≤0.2 mg / L, and the hydraulic retention time is 4h to 6h.
[0086] In some embodiments, such as Figure 1 As shown, the rapid membrane attachment device for the membrane aeration biofilm reactor also includes an air supply device 4, a first air supply pipe 5, and a second air supply pipe 6. Multiple membrane modules 1 are configured, with at least the first inoculation container 21 and the second inoculation container 22 simultaneously accommodating the corresponding membrane module 1. Preferably, the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23 simultaneously accommodating the corresponding membrane module 1.
[0087] The first air supply pipe 5 is connected between the air supply device 4 and the air inlet end of the membrane module 1 located in the first inoculation container 21, and the second air supply pipe 6 is connected between the exhaust end of the membrane module 1 located in the first inoculation container 21 and the air inlet end of the membrane module 1 located in the second inoculation container 22.
[0088] The air supply device 4 is preferably, but not limited to, an air compressor. The air supply device 4 supplies air into the membrane module 1 located in the first inoculation container 21 through the first air supply pipe 5, so that the membrane module 1 in the first inoculation container 21 can be aerated, and the dissolved oxygen concentration in the first inoculation container 21 can be controlled at 0.3 mg / L to 0.5 mg / L, thereby carrying out the first stage of membrane attachment.
[0089] The membrane module 1 in the first inoculation container 21 utilizes some of the oxygen in the air and then exhausts the air. The exhausted air is supplied to the membrane module 1 in the second inoculation container 22 through the second air supply pipe 6, so that the membrane module 1 in the second inoculation container 22 can be aerated and the dissolved oxygen concentration in the second inoculation container 22 can be controlled at 0.1 mg / L to 0.3 mg / L, thereby carrying out the second stage of membrane attachment.
[0090] The membrane module 1 inside the second inoculation container 22 utilizes the remaining oxygen in the air to reduce operating costs.
[0091] It is understood that in other embodiments, the gas supply device 4 may also be connected via pipelines to the air inlet of the membrane module 1 located in the first inoculation container 21 and the air inlet of the membrane module 1 located in the second inoculation container 22, respectively, to supply air or oxygen.
[0092] In some embodiments, such as Figure 1 As shown, the rapid biofilm attachment device for the membrane aeration biofilm reactor also includes an aeration pipe 7 and multiple aerators 3. Aerators 3 are provided in the first inoculation container 21, the second inoculation container 22 and the third inoculation container 23. The aerators 3 are preferably, but not limited to, aeration discs.
[0093] The aeration pipe 7 has an inlet and multiple outlets, preferably but not limited to three outlets. The inlet of the aeration pipe 7 is connected to the air outlet of the membrane module 1 located in the second inoculation container 22. The aerators 3 in the first inoculation container 21, the second inoculation container 22 and the third inoculation container 23 are respectively connected to the corresponding outlets of the aeration pipe 7. In other words, the first outlet of the aeration pipe 7 is connected to the aerator 3 in the first inoculation container 21, the second outlet of the aeration pipe 7 is connected to the aerator 3 in the second inoculation container 22, and the third outlet of the aeration pipe 7 is connected to the aerator 3 in the third inoculation container 23.
[0094] The membrane module 1 in the second inoculation container 22 utilizes the oxygen in the air inside the container and then discharges it. At this time, the discharged gas contains almost no oxygen and is mostly composed of nitrogen, which can be used as an aeration gas. It is supplied to the aerators 3 in the first inoculation container 21, the second inoculation container 22 and the third inoculation container 23 through the aeration pipe 7 for aeration. The aeration of the aerators 3 enables the nitrification carrier, the nitrification-anaerobic ammonium oxidation carrier and the anaerobic ammonium oxidation carrier to fully contact the membrane module 1. The aeration generates hydraulic shear force to improve the hydrophobicity of the carrier and promote biofilm attachment. At the same time, the flushing effect of the aeration makes the carrier attached to the membrane module 1 more compact to prevent the carrier and biofilm from falling off.
[0095] It is understood that in other embodiments, an inert gas supply device, preferably but not limited to a nitrogen supply device, may also be provided and connected to the aerators 3 in the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23 via pipelines, so that the aerators 3 can perform aeration. Alternatively, the inert gas supply device, preferably but not limited to a nitrogen supply device, may be connected to the aerators 3 in the third inoculation container 23 via pipelines, the aerators 3 in the first inoculation container 21 may be connected to the exhaust end of the membrane module 1 in the first inoculation container 21 via pipelines, and the aerators 3 in the second inoculation container 22 may be connected to the exhaust end of the membrane module 1 in the second inoculation container 22 via pipelines.
[0096] In some embodiments, such as Figure 1 As shown, the rapid biofilm attachment device for the membrane aeration biofilm reactor also includes an ammonia nitrogen supply device 8 and a nitrous oxide supply device 9. The ammonia nitrogen supply device 8 is connected to the first inoculation container 21, the second inoculation container 22 and the third inoculation container 23, and the nitrous oxide supply device 9 is connected to the third inoculation container 23.
[0097] The first inoculation container 21 and the second inoculation container 22 are continuously fed with ammonia nitrogen concentration of 30 mg / L to 50 mg / L, and the third inoculation container 23 is continuously fed with ammonia nitrogen concentration of 20 mg / L to 30 mg / L and nitrite concentration of 30 mg / L to 40 mg / L.
[0098] Optionally, such as Figure 1 As shown, the ammonia nitrogen supply device 8 includes an ammonia nitrogen container 81 and an ammonia nitrogen pipeline 82. The ammonia nitrogen container 81 is preferably, but not limited to, used to contain an ammonia nitrogen solution. The ammonia nitrogen pipeline 82 has an inlet and preferably, but not limited to, three outlets. The inlet of the ammonia nitrogen pipeline 82 is connected to the ammonia nitrogen container 81, and the three outlets of the ammonia nitrogen pipeline 82 are connected one-to-one with the inlets of the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23, thereby supplying ammonia nitrogen solution to the first inoculation container 21, the second inoculation container 22, and the third inoculation container 23.
[0099] Preferably, the three outlets of the ammonia nitrogen pipeline 82 are each equipped with a control valve to control the supply of ammonia nitrogen solution, thereby controlling the ammonia nitrogen concentration in the influent of the first inoculation container 21, the second inoculation container 22 and the third inoculation container 23.
[0100] Preferably, the bottom of the first inoculation container 21, the second inoculation container 22 and the third inoculation container 23 are provided with corresponding water inlets, which are located between the membrane module 1 and the aerator 3.
[0101] Optionally, such as Figure 1 As shown, the nitrite supply device 9 includes a nitrite container 91 and a nitrite pipeline 92. The nitrite container 91 is preferably, but not limited to, used to contain a nitrite solution. The inlet of the nitrite pipeline 92 is connected to the nitrite container 91, and the outlet of the nitrite pipeline 92 is connected to the inlet of the third inoculation container 23, or connected to a branch of the ammonia nitrogen pipeline 82 used to connect to the inlet of the third inoculation container 23 through a three-way valve, thereby supplying a nitrite solution to the third inoculation container 23, so that the third inoculation container 23 continuously receives water with a nitrite concentration of 30 mg / L to 40 mg / L.
[0102] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0103] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0104] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0105] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0106] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0107] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A method for rapid biofilm formation in a membrane-aerated biofilm reactor, characterized in that, include: The nitrification carrier and membrane module (1) are subjected to the first stage of membrane attachment in the inoculation container (2); The nitrification-anaerobic ammonia oxidation carrier and the membrane module (1) after the first stage of membrane formation are subjected to the second stage of membrane formation in the inoculation container (2); The anaerobic ammonia oxidation carrier and the membrane assembly (1) after the second stage of membrane attachment are subjected to the third stage of membrane attachment in the inoculation container (2).
2. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 1, characterized in that, During the first stage of membrane formation, the inoculation container (2) continuously receives water with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L, the volatile suspended solids concentration of the mixed liquid in the inoculation container (2) is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is 0.3 mg / L to 0.5 mg / L, the hydraulic retention time is 4h to 6h, and the membrane module (1) continuously aerates the membrane. During the second stage of membrane formation, the inoculation container (2) continuously receives water with an ammonia nitrogen concentration of 30 mg / L to 50 mg / L, the volatile suspended solids concentration of the mixed liquid in the inoculation container (2) is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is 0.1 mg / L to 0.3 mg / L, the hydraulic retention time is 4h to 6h, and the membrane module (1) continuously aerates the membrane. During the third stage of biofilm formation, the inoculation container (2) continuously receives water with an ammonia nitrogen concentration of 20 mg / L to 30 mg / L and a nitrite concentration of 30 mg / L to 40 mg / L. The volatile suspended solids concentration of the mixed liquid in the inoculation container (2) is 8000 mg / L to 30000 mg / L, the dissolved oxygen concentration is ≤0.2 mg / L, and the hydraulic retention time is 4h to 6h.
3. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 2, characterized in that, During the first stage of film formation, the second stage of film formation, and the third stage of film formation, an aerator (3) is installed in the inoculation container (2) and aeration is continuously performed; The aerator (3) uses an inert gas for aeration, and the membrane aeration gas of the membrane module (1) is oxygen or air.
4. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 1, characterized in that, The first stage of biofilm formation continues until the ammonia nitrogen removal rate of the membrane module (1) is 50%–80% and the nitrite accumulation rate of the effluent from the inoculation container (2) is 85%–100%; and / or The first stage of biofilm formation lasts for 2 to 4 days.
5. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 1, characterized in that, The second stage of membrane attachment continues until the total nitrogen removal rate of the membrane module (1) is 40%–70%; and / or The second stage of biofilm formation lasts for 2 to 4 days.
6. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 1, characterized in that, The third stage of membrane attachment continues until the total nitrogen removal rate of the membrane module (1) is 70%–85%; and / or The third stage of biofilm formation lasts for 2 to 4 days.
7. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 1, characterized in that, The inoculation container (2) is emptied after the first stage of membrane attachment, and then the second stage of membrane attachment is performed; the inoculation container (2) is emptied after the second stage of membrane attachment, and then the third stage of membrane attachment is performed; or The inoculation container (2) includes a first inoculation container (21), a second inoculation container (22), and a third inoculation container (23). The membrane assembly (1) can move between the first inoculation container (21), the second inoculation container (22), and the third inoculation container (23). The membrane assembly (1) performs the first stage of membrane attachment when it is in the first inoculation container (21), the second stage of membrane attachment when it is in the second inoculation container (22), and the third stage of membrane attachment when it is in the third inoculation container (23).
8. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 1, characterized in that, Also includes: Before the first stage of biofilm formation, the nitrite carrier is aerated in the inoculation container (2) or pretreatment container by an aerator (3) for pretreatment. The nitrite-anaerobic ammonia oxidation carrier is aerated in the pretreatment container by aerator (3) before the second stage of biofilm formation; Before the third stage of biofilm formation, the anaerobic ammonia oxidation carrier is aerated in the pretreatment container by an aerator (3) for pretreatment.
9. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 8, characterized in that, The pretreatment time for the nitrification carrier, the nitrification-anaerobic ammonium oxidation carrier, and the anaerobic ammonium oxidation carrier is 1 day to 2 days; and / or During the pretreatment process, the aerator (3) uses an inert gas for aeration.
10. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 1, characterized in that, Also includes: After the membrane is attached in the third stage, the membrane module (1) is moved into the reinforcement container, and the first stage reinforcement and the second stage reinforcement are carried out in the reinforcement container in sequence. The reinforcement container continuously adds reinforcement agent during the first stage reinforcement and stops adding reinforcement agent after the first stage reinforcement.
11. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 10, characterized in that, During the first and second stages of enhancement, the enhancement container continuously receives influent with an ammonia nitrogen concentration of 40 mg / L to 70 mg / L, and the dissolved oxygen concentration within the enhancement container is 0.1 mg / L to 0.2 mg / L; and / or After the addition of the enhancer, the concentration of the enhancer in the enhancer container is 5 mg / L to 10 mg / L.
12. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 10, characterized in that, The first stage of enhancement continues until the total nitrogen removal rate of the membrane module (1) with attached membrane is 80%–90%; and / or The first stage of intensive treatment lasts for 4 to 8 days.
13. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 10, characterized in that, The second stage of enhancement continues until the total nitrogen removal rate of the membrane module (1) with attached membrane is 85%–95%; and / or The second phase of intensive treatment lasts for 10 to 20 days.
14. The rapid biofilm attachment method for a membrane-aerated biofilm reactor according to claim 10, characterized in that, The reinforcing agent is NH2OH; and / or The reinforced container is a water treatment container.
15. A rapid biofilm attachment device for a membrane aeration biofilm reactor, characterized in that, The method for rapid biofilm attachment in a membrane aeration biofilm reactor according to any one of claims 1-14 includes: a membrane module (1) and an inoculation container (2), wherein the inoculation container (2) includes a first inoculation container (21), a second inoculation container (22) and a third inoculation container (23), wherein the membrane module (1) is movable between the first inoculation container (21), the second inoculation container (22) and the third inoculation container (23), wherein the first inoculation container (21) is used to contain the membrane module (1) and the nitrification carrier for a first stage of biofilm attachment, wherein the second inoculation container (22) is used to contain the membrane module (1) and the nitrification-anaerobic ammonia oxidation carrier for a second stage of biofilm attachment, and wherein the third inoculation container (23) is used to contain the membrane module (1) and the anaerobic ammonia oxidation carrier for a third stage of biofilm attachment.
16. The rapid biofilm attachment device for a membrane-aerated biofilm reactor according to claim 15, characterized in that, Also includes: The gas supply device (4), the first gas supply pipe (5), and the second gas supply pipe (6) are provided. The membrane module (1) is configured as multiple. The first gas supply pipe (5) is connected between the gas supply device (4) and the air inlet end of the membrane module (1) located in the first inoculation container (21). The second gas supply pipe (6) is connected between the exhaust end of the membrane module (1) located in the first inoculation container (21) and the air inlet end of the membrane module (1) located in the second inoculation container (22).
17. The rapid biofilm attachment device for a membrane-aerated biofilm reactor according to claim 16, characterized in that, Also includes: An aeration pipe (7) and multiple aerators (3) are provided in the first inoculation container (21), the second inoculation container (22) and the third inoculation container (23). The aeration pipe (7) has an inlet and multiple outlets. The inlet of the aeration pipe (7) is connected to the air outlet of the membrane module (1) located in the second inoculation container (22). The aerators (3) in the first inoculation container (21), the second inoculation container (22) and the third inoculation container (23) are respectively connected to the corresponding outlets of the aeration pipe (7).
18. The rapid biofilm attachment device for a membrane-aerated biofilm reactor according to claim 15, characterized in that, Also includes: Ammonia nitrogen supply device (8) and nitrous oxide supply device (9) are provided. The ammonia nitrogen supply device (8) is connected to the first inoculation container (21), the second inoculation container (22) and the third inoculation container (23). The nitrous oxide supply device (9) is connected to the third inoculation container (23).