Ceramic membrane filter floatation wastewater treatment system and treatment method thereof

Abstract

The application provides a ceramic membrane floatation CMFF wastewater treatment system and a treatment method thereof. The method comprises: a pretreatment step, in which raw water to be treated stored in a pretreatment tank is pretreated to obtain pretreated effluent; a biological CMFF treatment step, in which the pretreated effluent transported into a biological CMFF treatment tank is treated by a ceramic flat plate membrane bioreactor (CMBR) to remove organic pollutants, and filtered through the microporous structure of the CMBR, and the oil and other hydrophobic pollutants contained in the pretreated effluent are taken to the water surface by the nanometer micro-bubbles formed by the microporous structure to form scum and oil concentrate, so that the scum and oil are instantaneously and naturally pressed out; and a CMBR backwashing step, in which the ceramic flat plate membrane bioreactor is backwashed by compressed gas generated by an air pressure input device of a floatation backwashing unit and a control valve for adjusting the delivery of the compressed gas.

Description

Technical Field

[0001] This application relates to a ceramic membrane filtration flotation system for treating CMFF wastewater and its treatment method, particularly to a wastewater treatment system and its treatment method that combines high-efficiency separation and flotation technology with ceramic membrane filtration to remove organic matter, grease and other pollutants from wastewater. Background Technology

[0002] With industrial development, the resulting large amounts of industrial wastewater pollute rivers and soil. Industrial wastewater often contains grease, which, although relatively low in toxicity, can still negatively impact the ecological environment if discharged without proper treatment. Traditional activated sludge processes are effective for treating highly polluted wastewater, but require significant time and space. When faced with large volumes of industrial wastewater needing treatment, traditional methods still have room for improvement, and more efficient and space-saving technologies are urgently needed to address this challenge.

[0003] Existing technologies for removing oil from wastewater include physical methods, chemical methods, biological treatment methods, membrane filtration technology, and adsorption methods. Among physical methods, oil-floating separation and flocculation sedimentation are common treatment technologies. Oil-floating separation utilizes the buoyancy of oil to separate oil from water; common methods include gravity separation, flotation, and the use of oil-water separators (such as belt filters and plate and frame filters). However, oil-floating separation technology faces the following problems: First, the type of oil affects the separation effect; for emulsified or dissolved oils, flotation and gravity separation are less effective and require additional treatment. Second, during the oil-water separation process, tiny oil particles (minimum oil particle size of 0.2 micrometers) may float in the water and cannot be completely removed, resulting in low separation efficiency. Furthermore, oil-water separation equipment requires regular maintenance to prevent oil accumulation, which increases operating costs.

[0004] Furthermore, flocculation and sedimentation involves adding flocculants to wastewater, causing oil particles in the water to aggregate into larger particles, which are then removed by gravity settling or filtration. However, flocculation and sedimentation technology also presents challenges, including the need to select suitable flocculants, and the increased operating costs associated with their use. Because oil particles are small, their settling speed is slow, resulting in longer processing times; and the use of flocculant residue requires additional treatment, further increasing the difficulty and cost of treatment.

[0005] Secondly, chemical methods include chemical flocculation and neutralization. Chemical flocculation uses chemical agents such as polyvalent metal salts to promote the aggregation of oil particles, causing them to precipitate. However, the use of chemical agents produces byproducts or polluting sludge that are difficult to recover, requiring subsequent treatment and increasing the overall complexity of the process. The purchase of chemical agents and sludge treatment are costly and require specialized operation, which not only increases operating costs but also raises management difficulties. Furthermore, excessive use of chemical agents may cause secondary pollution to the environment. Neutralization, on the other hand, neutralizes oils containing acidic or alkaline substances, converting them into a separable form. However, neutralization is mainly effective for acidic or alkaline oils and is less effective for other types of oils. Precise control of reaction conditions is necessary; otherwise, harmful byproducts may be generated.

[0006] Furthermore, biological treatment methods include aerobic and anaerobic biological treatment. Aerobic biological treatment decomposes organic matter, including oils, in water through the metabolism of microorganisms. Common equipment includes aeration tanks and activated sludge processes. However, aerobic treatment requires stable dissolved oxygen conditions and is sensitive to fluctuations in water quality, which may affect treatment efficiency. High oil concentrations can also coat the surface of microorganisms, affecting biochemical reactions, inhibiting microbial growth, and thus reducing treatment efficiency. In addition, biological treatment typically requires a long time to degrade oils, which may not meet the needs of real-time treatment. On the other hand, anaerobic biological treatment utilizes anaerobic microorganisms to degrade oils and is typically used to treat high-concentration oily wastewater. However, while anaerobic treatment is effective for high-concentration oils, it is less effective for wastewater containing high concentrations of ammonia nitrogen, heavy metals, or other harmful substances. Furthermore, gases produced during anaerobic treatment (such as methane) require appropriate treatment; otherwise, they may have negative environmental impacts.

[0007] Next, membrane filtration technologies include ultrafiltration (UF) and nanofiltration (NF) membranes. These membranes utilize special organic materials (such as PVDF) to filter out oils and grease from water based on physical filtration principles, achieving high separation efficiency. However, these technologies also face the following challenges: First, oily wastewater easily leads to organic membrane fouling and clogging, thereby reducing filtration efficiency, and the membrane cleaning process is complex and time-consuming. Second, membrane filtration technology has high energy requirements, especially when treating high-concentration oils, increasing operating costs. Furthermore, membrane materials are expensive and require regular replacement, further increasing maintenance and operating costs.

[0008] In addition, adsorption methods include activated carbon adsorption, which removes oily pollution by contacting oily wastewater with activated carbon and utilizing the porous structure of the activated carbon to adsorb the oil in the water. These technologies are often combined based on the oil concentration, characteristics, and treatment volume of the wastewater to achieve the best oil removal effect. In practical applications, physical, chemical, and biological treatment methods are usually combined to form a multi-stage treatment process. However, the effectiveness of adsorbents (such as activated carbon) decreases after adsorbing oil, requiring regular replacement or regeneration, thus increasing operating costs. Furthermore, the amount of oil adsorbed in a single step is limited, potentially requiring frequent adsorbent replacements, further impacting treatment efficiency and increasing operational burden.

[0009] In summary, in order to overcome the aforementioned shortcomings, the inventors of this case have devoted considerable research and development energy and effort to continuous breakthroughs and innovations in this field, hoping to solve the deficiencies of existing technologies with novel technical means, thereby bringing better products to society and promoting industrial development. Summary of the Invention

[0010] The technical problem to be solved by this application is to provide a ceramic membrane filtration flotation system and method for treating CMFF wastewater. The CMFF wastewater treatment system and method are designed to address the characteristics of different types of wastewater, combining high-efficiency separation and flotation technology with ceramic membrane filtration. This not only improves the removal efficiency of pollutants but also offers advantages such as high treatment efficiency, strong adaptability, and low operating costs. It can be widely applied to wastewater treatment in various industries such as petrochemicals, food processing, and machinery manufacturing.

[0011] To achieve the above objectives, this application provides a ceramic membrane flotation CMFF wastewater treatment system comprising at least: a raw water storage tank, a first biological CMFF treatment tank, and a flotation backwashing unit. First, the raw water storage tank is a tank with internal containment space and raw water inlet and outlet components, used to store raw water to be treated containing at least organic matter and oil contaminants. Second, the first biological CMFF treatment tank is located downstream of the raw water storage tank and forms liquid communication with it. The first biological CMFF treatment tank is a tank containing a first biological CMFF treatment chamber, at least one ceramic flat-plate membrane bioreactor (CMBR) disposed within the first biological CMFF treatment chamber, and a first biological treated water outlet channel. The flotation backwash unit is connected to the downstream end of the first biological CMFF treatment tank and forms a gas connection. The flotation backwash unit includes at least one high-pressure air input device (e.g., a high-pressure air CDA or air compressor) and a control valve. The raw water to be treated includes at least one of the following: natural water bodies containing oil and organic pollution, groundwater, reservoir water, industrial water, circulating water, recycled water, secondary water, effluent, wastewater treatment plant effluent, and combinations thereof. The ceramic flat plate membrane bioreactor (CMBR) includes at least: a first ceramic flat plate body with multiple first pores and a second ceramic flat plate body with multiple second pores. The chemical oxygen demand (COD) removal rate of the raw water to be treated reaches 90% or more, and the oil removal rate of the raw water to be treated reaches 95% or more.

[0012] The CMFF wastewater treatment system of this application also includes a pretreatment tank, which is located downstream of the raw water storage tank and forms a liquid connection. The pretreatment tank is used to remove large particulate solids, harmful substances, or other substances that may easily damage subsequent treatment facilities from the raw water to be treated.

[0013] The CMFF wastewater treatment system of this application further includes a first biological treatment tank, which is disposed at the downstream end of the raw water storage tank and forms a liquid connection. The first biological treatment tank is a tank body having a first biological treatment chamber, multiple porous biological supports disposed in the biological treatment chamber, and a biologically treated water outflow channel. A gas inlet is provided at the bottom of the first biological treatment tank for gas input. The first biological treatment tank is selected from one of the following: aerobic biological treatment tank, SBR biological treatment tank, biological denitrification tank, anaerobic biological treatment tank, facultative anaerobic biological treatment tank, and combinations thereof.

[0014] The CMFF wastewater treatment system of this application further includes a second biological treatment tank, the interior of which has a second biological treatment chamber and a plurality of nanoporous filtration membrane devices NF disposed in the second biological treatment chamber, wherein the pore size of the nanoporous filtration membrane devices is between 0.01 and 0.001 μm.

[0015] In the CMFF wastewater treatment system of this application, the first biological CMFF treatment tank is configured in parallel or in series, and the at least one ceramic flat plate membrane bioreactor includes a first ceramic flat plate body with multiple first pores and a second ceramic flat plate body with multiple second pores. The pore size of the first and second pores is not particularly limited; for example, the first and second pores can have the same pore size or different pore sizes.

[0016] To achieve the aforementioned objective, this application provides a method for treating CMFF wastewater by ceramic membrane flotation, which is used to treat raw water containing organic matter and oil contaminants. The treatment method includes at least the following steps. First, a pretreatment step is performed on the raw water to be treated stored in a pretreatment tank to remove large particulate solids, harmful substances, or other substances that may easily damage subsequent treatment facilities, and to obtain pretreated effluent.

[0017] Secondly, in the biological CMFF treatment step, the pretreated effluent transported to a biological CMFF treatment tank utilizes suspended active microorganisms in the biological CMFF treatment tank and the biofilm grown in the ceramic flat-plate membrane bioreactor (CMBR) to degrade and remove organic pollutants. Suspended particles, organic residues, and colloidal substances are removed by filtration through the microporous structure of the CMBR. High-pressure air passes through nanobubbles formed by the microporous structure to reverse-flow the surface fouling of the ceramic filter membrane, and carries grease and other hydrophobic pollutants contained in the pretreated effluent to the water surface, forming scum and grease concentrate. The valve is then instantly opened, and the scum and grease concentrate are naturally expelled to obtain biological CMFF treated effluent.

[0018] Furthermore, in the CMBR backwashing step, compressed gas generated by a high-pressure air input device of the flotation backwashing unit and a control valve for regulating the delivery of the compressed gas are used to backwash the ceramic flat sheet membrane bioreactor to effectively remove grease, particulate matter, organic matter, scum, and / or grease concentrates adhering to the surface of the CMBR; wherein the raw water to be treated is at least one of the following: natural water body water containing grease and organic pollution, groundwater, reservoir water, industrial water, circulating water, recycled water, secondary water, effluent, wastewater treatment plant effluent, and combinations thereof.

[0019] In the ceramic membrane filtration flotation method for treating CMFF wastewater of this application, the compressed gas provided by the flotation backwashing unit is air, nitrogen, carbon dioxide or a mixture thereof.

[0020] In the ceramic membrane filtration and flotation method for treating CMFF wastewater in this application, the diameter of the microbubbles ranges from 0.1 to 50 micrometers.

[0021] In the ceramic membrane filtration flotation method for treating CMFF wastewater of this application, the chemical oxygen demand (COD) removal rate of the raw water to be treated reaches 90% or more, and the scum concentration ratio of the chemical oxygen demand is 53% or more.

[0022] In the ceramic membrane filtration flotation method for treating CMFF wastewater of this application, the oil removal rate in the raw water to be treated reaches 95% or more, and the oil scum concentration ratio is 35% or more.

[0023] The other effects and embodiments of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the ceramic membrane flotation system for removing CMFF wastewater, as described in Embodiment 1 of this application.

[0026] Figure 2 This is a schematic diagram of the ceramic membrane flotation system for removing CMFF wastewater, as described in Embodiment 2 of this application.

[0027] Figure 3 This is a schematic diagram of the ceramic membrane flotation system for removing CMFF wastewater, as described in Embodiment 3 of this application.

[0028] Figure 4 This is a schematic diagram of the ceramic membrane flotation system for removing CMFF wastewater, as described in Embodiment 4 of this application.

[0029] Figure 5 This is a schematic diagram of the ceramic membrane flotation system for removing CMFF wastewater, as described in Embodiment 5 of this application.

[0030] Figure 6 This is a flowchart of the ceramic membrane flotation method for treating CMFF wastewater in this application;

[0031] Figure 7This is a flowchart of another embodiment of the ceramic membrane filtration and flotation method for treating CMFF wastewater according to this application.

[0032] Symbol Explanation

[0033] 1: Ceramic membrane flotation CMFF wastewater treatment system

[0034] 10: Raw water storage tank; 11: Pretreatment tank

[0035] 20: First biological CMFF treatment tank; 21: Second biological CMFF treatment tank

[0036] 30: Float backwash unit; 40: Clear water tank

[0037] 50: First biological treatment tank; 51: Second biological treatment tank Detailed Implementation

[0038] In the embodiments described below, the positional relationships include: up, down, left, and right. Unless otherwise specified, they are all based on the direction shown by the components in the diagram.

[0039] Please see Figure 1 , Figure 1 This is a schematic diagram of the ceramic membrane flotation system for treating CMFF wastewater, as described in Embodiment 1 of this application.

[0040] like Figure 1As shown, this application provides a ceramic membrane filtration flotation CMFF wastewater treatment system 1, which includes at least: a raw water storage tank 10, a first biological CMFF treatment tank 20, a flotation backwashing unit 30, and a clear water tank 40. The raw water storage tank 10 is a tank with internal receiving space and raw water inlet and outlet components, used to store raw water to be treated containing at least organic matter and oil contaminants. The first biological CMFF treatment tank 20 is located downstream of the raw water storage tank and forms liquid communication with it. The first biological CMFF treatment tank 20 has an internal first biological CMFF treatment chamber, at least one ceramic flat-plate membrane bioreactor (CMBR) disposed within the first biological CMFF treatment chamber, and a tank with a first biological treated water outlet channel. Furthermore, the flotation backwash unit 30 is connected to the downstream end of the first biological CMFF treatment tank 20 and forms gas communication. The flotation backwash unit includes at least an air compressor and a control valve. The raw water to be treated includes at least one of the following: natural water bodies containing oil and organic pollution, groundwater, reservoir water, industrial water, circulating water, recycled water, secondary water, effluent, wastewater treatment plant effluent, and combinations thereof. The ceramic flat-plate membrane bioreactor (CMBR) includes at least: a first ceramic flat plate body with multiple first pores and a second ceramic flat plate body with multiple second pores. The pore size of the first and second pores is not particularly limited; for example, the first and second pores can have the same pore size or different pore sizes.

[0041] Please see Figure 2 , Figure 2 This is a schematic diagram of the ceramic membrane flotation system for treating CMFF wastewater, as described in Embodiment 2 of this application.

[0042] The apparatus of Embodiment 2 of this application is substantially the same as that of Embodiment 1, except that Embodiment 2 further includes a pre-treatment tank 11. Figure 2 As shown, the pretreatment tank 11 is located downstream of the raw water storage tank 10 and forms a liquid connection. The pretreatment tank 11 is used to remove large particulate solids, harmful substances, or other substances that may easily damage subsequent treatment facilities from the raw water to be treated.

[0043] Please see Figure 3 , Figure 3 This is a schematic diagram of the ceramic membrane flotation system for treating CMFF wastewater, as described in Embodiment 3 of this application.

[0044] The apparatus of Embodiment 3 of this application is substantially the same as that of Embodiment 2, except that Embodiment 3 further includes a first biological treatment tank 50. Figure 3As shown, the first biological treatment tank 50 is disposed downstream of the pretreatment tank 11 and forms a liquid connection. The first biological treatment tank 50 is a tank body having a first biological treatment chamber, multiple porous biological supports disposed in the biological treatment chamber, and a biologically treated water outflow channel. A gas inlet is provided at the bottom of the first biological treatment tank 50 for gas input. The first biological treatment tank 50 is selected from one of the following: aerobic biological treatment tank, SBR biological treatment tank, biological denitrification tank, anaerobic biological treatment tank, facultative anaerobic biological treatment tank, and combinations thereof. Furthermore, the gas inlet component is at least one of the following: a porous vent pipe, a perforated vent pipe, a nozzle vent pipe, a bubble stone plate, a ventilator, and a diffuser.

[0045] Furthermore, these porous biosupports are designed for microbial attachment to form a biofilm, thereby increasing the mean cell retention time and diversity of microorganisms. In addition, these porous biosupports are generally made of compressible polymer materials, such as open-cell PU foam. Besides having a large surface area for microbial attachment, their compressibility allows the porous biosupports to automatically adjust their position in response to local pressure loss changes within the first biological treatment tank 50, thus avoiding blockage and uniformly dispersing gas and incoming water.

[0046] Please see Figure 4 , Figure 4 This is a schematic diagram of the ceramic membrane flotation system for treating CMFF wastewater, as described in Embodiment 4 of this application.

[0047] The apparatus of Embodiment 4 of this application is substantially the same as that of Embodiment 3, except that Embodiment 4 further includes a second biological treatment tank 51. Figure 4 As shown, the second biological treatment tank 51 has a second biological treatment chamber and multiple nanoporous filtration membrane devices NF disposed in the second biological treatment chamber. The pore size of the nanoporous filtration membrane devices is between 0.01 and 0.001 μm. The nanoporous filtration membrane devices are of any one of the following types: flat membrane, tubular membrane, spiral membrane, and hollow fiber membrane, preferably tubular membrane; and the nanoporous filtration membrane devices are composed of any one of cellulose acetate (CA), polyamide (PA), polysulfone (PS), peroxyacetyl nitrate (PAN), polypropylene (PP), thin-film composite (TFC), polyvinylidene fluoride (PVDF), and combinations thereof.

[0048] Please see Figure 5, Figure 5 This is a schematic diagram of the ceramic membrane filtration and flotation system for treating CMFF wastewater, as described in Embodiment 5 of this application.

[0049] The apparatus in Embodiment 5 of this application is largely the same as that in Embodiment 3, except that Embodiment 5 further includes a second biological CMFF treatment tank 21 and two sets of flotation backwashing units 30. Figure 5 As shown, the second biological CMFF treatment tank 21 is configured in parallel or in series, and the at least one ceramic plate membrane bioreactor includes a first ceramic plate body with multiple first pores and a second ceramic plate body with multiple second pores. The pore size of the first and second pores is not particularly limited; for example, the first and second pores can have the same pore size or different pore sizes.

[0050] Please see Figure 6 , Figure 6 This is a flowchart of the ceramic membrane filtration and flotation method for treating CMFF wastewater in this application.

[0051] like Figure 6 As shown, this application provides a method for treating CMFF wastewater by ceramic membrane flotation, which is used to treat raw water containing organic matter and oil contaminants. The treatment method includes at least the following steps.

[0052] First, in the pretreatment step S11, a raw water to be treated stored in a pretreatment tank is pretreated to remove large particulate solids, harmful substances or other substances that may easily damage subsequent treatment facilities from the raw water to be treated, and to obtain a pretreated effluent.

[0053] Secondly, in the biological CMFF treatment step S12, the pretreated effluent transported to a biological CMFF treatment tank is degraded and removed by suspended active microorganisms in the biological CMFF treatment tank and by the biofilm grown in the ceramic flat sheet membrane bioreactor (CMBR). Suspended particles, organic residues, and colloidal substances are removed by filtration through the microporous structure of the CMBR. Furthermore, the microbubbles formed by the microporous structure carry the oil and other hydrophobic pollutants contained in the pretreated effluent to the water surface to form a scum and an oil concentrate. The scum and the oil concentrate are then removed to obtain a biological CMFF treated effluent, wherein the diameter of the microbubbles ranges from 0.1 to 50 micrometers.

[0054] Furthermore, in the CMBR backwashing step S13, the ceramic flat-sheet membrane bioreactor is backwashed using compressed gas generated by an air compressor in the flotation backwashing unit and a control valve for regulating the delivery of the compressed gas. This effectively removes grease, particulate matter, organic matter, scum, and / or grease concentrates adhering to the surface of the CMBR. The raw water to be treated is at least one of the following: natural water bodies containing grease and organic pollution, groundwater, reservoir water, industrial water, circulating water, recycled water, secondary water, effluent, wastewater treatment plant effluent, and combinations thereof. Additionally, the compressed gas provided by the flotation backwashing unit is air, nitrogen, carbon dioxide, or a mixture thereof.

[0055] Please see Figure 7 , Figure 7 This is a flowchart of another embodiment of the ceramic membrane filtration and flotation method for treating CMFF wastewater according to this application.

[0056] like Figure 7 As shown in another embodiment of this application, a method for treating CMFF wastewater by ceramic membrane flotation includes at least the following steps: Step S101: The raw water to be treated, containing organic matter and oily pollutants, is input into a raw water storage tank for storage. The raw water to be treated is at least one of the following: natural water bodies containing oil and organic pollutants, groundwater, reservoir water, industrial water, circulating water, recycled water, secondary water, effluent, wastewater treatment plant effluent, and combinations thereof.

[0057] Pretreatment step S102: The raw water to be treated is transported to a pretreatment tank to remove large particulate solids, harmful substances or other substances that may easily damage subsequent treatment facilities from the raw water to be treated, and a pretreated effluent is obtained.

[0058] Biological CMFF treatment step S103: Separating oil and other hydrophobic contaminants, the pretreated raw water to be treated is transported to at least one ceramic flat-plate membrane bioreactor in a first biological CMFF treatment tank. The microbubbles generated by the ceramic flat-plate membrane bioreactor combine with the oil and other hydrophobic contaminants in the raw water to be treated, bringing them to the water surface to form scum and oil concentrate. The ceramic flat-plate membrane bioreactor filters through its microporous structure to remove fine suspended particles, organic residues, and colloidal substances from the water. The diameter of the microbubbles ranges from 0.1 to 50 micrometers.

[0059] Furthermore, the ceramic flat-sheet membrane bioreactor has at least one hydrophilic coating and at least one fouling-resistant coating on its surface. The at least one hydrophilic coating is at least one of titanium dioxide nano-coating, silica coating, polyethylene glycol coating, polyoxyethylene coating, and combinations thereof. The hydrophilic coating enhances the hydrophilicity of the ceramic flat-sheet membrane bioreactor surface, making it easier for water molecules to wet the membrane surface, thereby reducing the adhesion of hydrophobic contaminants (such as grease and organic matter) to the surface of the ceramic flat-sheet membrane bioreactor. Secondly, the hydrophilic coating reduces the accumulation of contaminants on the surface of the ceramic flat-sheet membrane bioreactor, reducing the need for membrane cleaning and extending the operating cycle. In addition, the hydrophilic coating promotes microbial attachment and stable biofilm growth, improving the efficiency of the ceramic flat-sheet membrane in the bioreactor.

[0060] Furthermore, the at least one antifouling coating is at least one of a fluoropolymer coating, a polytetrafluoroethylene nanocoating, a hydrophobic / hydrophilic hybrid structure coating, or a combination thereof. The antifouling coating possesses hydrophobic or anti-fouling properties, effectively inhibiting the adhesion of grease and other hydrophobic contaminants to the membrane surface. Secondly, the antifouling coating inhibits the growth of biofilms or bacteria on the membrane surface, reducing the risk of biofouling. Furthermore, the antifouling coating prevents direct corrosion of the ceramic membrane filter substrate by chemical contaminants or strong acid / alkali environments, extending the membrane's service life. In addition, the antifouling coating reduces the firm adhesion of contaminants, making it easier to restore the membrane's filtration performance during cleaning.

[0061] CMBR backwashing step S104: The ceramic flat-sheet membrane bioreactor is backwashed using compressed gas generated by an air compressor in the flotation backwashing unit and a control valve for regulating the delivery of the compressed gas. This effectively removes grease, particulate matter, organic matter, scum, and / or grease concentrates adhering to the surface of the CMBR. The raw water to be treated is at least one of the following: natural water bodies containing grease and organic pollution, groundwater, reservoir water, industrial water, circulating water, recycled water, secondary water, effluent, wastewater treatment plant effluent, and combinations thereof. Furthermore, the compressed gas provided by the flotation backwashing unit is air, nitrogen, carbon dioxide, or a mixture thereof.

[0062] Step S105: The treated water from the biological CMFF tank after being treated by the first biological CMFF treatment tank is exported and transported to a clean water tank for storage or further treatment.

[0063] Please refer to Table 1 below. As shown in Table 1, the CMFF wastewater treatment method using ceramic membrane filtration flotation achieves a COD removal rate of 90% or higher in the raw water to be treated, with a COD scum concentration ratio of 53% or higher. Furthermore, the grease removal rate in the raw water to be treated reaches 95% or higher, with a grease scum concentration ratio of 35% or higher.

[0064] Table 1

[0065]

[0066]

[0067] The chemical oxygen content (COD) removal rate, COD removal efficiency, COD scum concentration ratio, and oil removal rate, oil removal efficiency, and oil scum concentration ratio in the raw water to be treated respectively conform to the following equations (1), (2), (3), and (4):

[0068] Equation (1): COD removal rate = (COD of raw water to be treated after screening - COD of filtered water) / COD of raw water to be treated after screening;

[0069] Equation (2): COD removal efficiency = (COD of unscreened raw water to be treated - COD of screened raw water to be treated) / COD of unscreened raw water to be treated;

[0070] Equation (3): COD scum concentration ratio = 1 - [(COD of raw water to be treated after screening - scum pressed out) / COD of raw water to be treated after screening];

[0071] Formula (4): Oil removal rate = (Oil in raw water after sieving - Oil in filtered water) / Oil in raw water after sieving;

[0072] Equation (5): Grease removal efficiency = (Oil in unscreened raw water - Oil in screened raw water) / Oil in unscreened raw water;

[0073] Formula (6): Oil scum concentration ratio = 1 - [(oil in unscreened raw water to be treated - scum pressed out) / raw water to be treated after screening].

[0074] In summary, the ceramic membrane flotation system and method for treating CMFF wastewater in this application mainly achieves efficient removal of grease, organic matter, and suspended particles from wastewater through air flotation separation, ceramic membrane filtration, and compressed air backwashing protection. The air flotation technology in this application utilizes microbubbles to combine with grease and hydrophobic pollutants in the wastewater, carrying them to the water surface to form scum, achieving efficient separation. This is particularly suitable for wastewater treatment in industries such as catering and petrochemicals, significantly reducing the concentration of grease in the water. Secondly, the backwashing unit in this application effectively removes adhering pollutants from the membrane surface of the ceramic flat-plate membrane bioreactor through compressed gas backwashing, extending the membrane's lifespan, reducing the frequency of membrane replacement, and maintaining high removal efficiency. This application can provide stable, high-quality effluent, adapting to various wastewater treatment needs, while also possessing the characteristics of energy saving, environmental protection, and low operating costs.

[0075] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of this application, and are not intended to limit the implementation methods of the technology of this application in any way. Any person skilled in the art may make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in this application, but these should still be regarded as the technology or embodiments that are substantially the same as those of this application.

Claims

1. A ceramic membrane flotation system for treating CMFF wastewater, characterized in that, The wastewater treatment system includes at least: A raw water storage tank is a tank with internal containment space and raw water inlet components and raw water outlet components, used to store raw water to be treated containing at least organic matter and oil contaminants; A first biological CMFF treatment tank is disposed downstream of the raw water storage tank and forms liquid communication with it. The first biological CMFF treatment tank comprises a first biological CMFF treatment chamber, at least one ceramic flat-plate membrane bioreactor (CMBR) disposed in the first biological CMFF treatment chamber, and a tank body having a first biological treated water outflow channel; and A flotation backwash unit is connected to the downstream end of the first biological CMFF treatment tank and forms a gas connection. The flotation backwash unit includes at least one air compressor input device and one control valve. The raw water to be treated includes at least one of the following: natural water bodies containing oil and organic pollution, groundwater, reservoir water, industrial water, circulating water, recycled water, secondary water, effluent, wastewater treatment plant effluent, and combinations thereof. The ceramic flat plate membrane bioreactor (CMBR) comprises at least: a first ceramic flat plate body having multiple first pores and a second ceramic flat plate body having multiple second pores; The chemical oxygen demand (COD) removal rate in the raw water to be treated reaches 90% or more. The oil removal rate in the raw water to be treated reaches 95% or more.

2. The ceramic membrane flotation wastewater treatment system for removing CMFF as described in claim 1, characterized in that, It also includes a pretreatment tank, which is located downstream of the raw water storage tank and forms a liquid connection. The pretreatment tank is used to remove large particulate solids, harmful substances, or other substances that may easily damage subsequent treatment facilities from the raw water to be treated.

3. The ceramic membrane flotation wastewater treatment system for removing CMFF as described in claim 1, characterized in that, It also includes a first biological treatment tank, which is disposed at the downstream end of the raw water storage tank and forms a liquid connection. The first biological treatment tank is a tank body having a first biological treatment chamber, multiple porous biological supports disposed in the biological treatment chamber, and a biologically treated water outflow channel. A gas inlet is provided at the bottom of the first biological treatment tank for gas input. The first biological treatment tank is selected from one of the following: aerobic biological treatment tank, SBR biological treatment tank, biological denitrification tank, anaerobic biological treatment tank, facultative biological treatment tank, and combinations thereof.

4. The ceramic membrane flotation wastewater treatment system for removing CMFF as described in claim 1, characterized in that, It also includes a second biological treatment tank, the interior of which has a second biological treatment chamber and a plurality of nanoporous filter membrane devices NF disposed in the second biological treatment chamber, wherein the pore size of the nanoporous filter membrane devices is between 0.01 and 0.001 μm.

5. The ceramic membrane flotation wastewater treatment system for removing CMFF as described in claim 1, characterized in that, The first biological CMFF treatment tank is composed of multiple parallel or series configurations, and the at least one ceramic plate membrane bioreactor includes a first ceramic plate body with multiple first pores and a second ceramic plate body with multiple second pores.

6. A method for treating CMFF wastewater by ceramic membrane filtration and flotation, characterized in that, The treatment method for treating raw water containing organic matter and oil contaminants includes at least the following steps: The pretreatment step involves pretreating a raw water to be treated stored in a pretreatment tank to remove large particulate solids, harmful substances, or other substances that may easily damage subsequent treatment facilities from the raw water to be treated, and to obtain a pretreated effluent. The biological CMFF treatment step involves the following steps: For the pretreated effluent fed into a biological CMFF treatment tank, suspended active microorganisms in the biological CMFF treatment tank and the biofilm grown in a ceramic flat-plate membrane bioreactor (CMBR) degrade and remove organic pollutants. Suspended particles, organic residues, and colloidal substances are removed by filtration through the microporous structure of the CMBR. Furthermore, microbubbles formed by the microporous structure carry oils and other hydrophobic pollutants contained in the pretreated effluent to the surface, forming scum and an oil concentrate. The scum and oil concentrate are then removed to obtain biological CMFF treated effluent. The CMBR backwashing step involves using compressed gas generated by an air compressor in the backwashing unit and a control valve to regulate the delivery of the compressed gas to backwash the ceramic flat-sheet membrane bioreactor, effectively removing grease, particulate matter, organic matter, scum, and / or grease concentrates adhering to the CMBR surface; wherein The raw water to be treated is at least one of the following: natural water bodies containing oil and organic pollution, groundwater, reservoir water, industrial water, circulating water, recycled water, secondary water, effluent, wastewater treatment plant effluent, and combinations thereof.

7. The method for treating CMFF wastewater by ceramic membrane flotation according to claim 6, characterized in that, The compressed gas provided by the flotation backwash unit is air, nitrogen, carbon dioxide, or a mixture thereof.

8. The method for treating CMFF wastewater by ceramic membrane flotation according to claim 6, characterized in that, The diameter of the microbubbles ranges from 20 to 50 micrometers.

9. The method for treating CMFF wastewater by ceramic membrane flotation according to claim 6, characterized in that, The chemical oxygen demand (COD) removal rate of the raw water to be treated reaches 90% or above, and the scum concentration ratio of the chemical oxygen demand is 53% or above.

10. The method for treating CMFF wastewater by ceramic membrane flotation according to claim 6, characterized in that, The oil removal rate in the raw water to be treated reaches 95% or more, and the oil scum concentration ratio is 35% or more.

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