Separation device and separation and recovery process for fine powder carrier coated with biological membrane

Abstract

The invention relates to the technical field of sewage biochemical treatment enhancement, in particular to a separation device and a separation and recovery process for a fine powder carrier coated with a biological membrane, and the separation device comprises a separation module and a product conveying unit from front to back according to the process flow; the separation module comprises at least one hydrocyclone, the hydrocyclone is provided with two outlets, and the two outlets are respectively used for discharging two separated products with relatively large carrier content difference; and the product conveying unit can be used for conveying the separated products to other appointed process units respectively. Through the arrangement, continuous, efficient and selective separation of a fine powder carrier and a loaded biological membrane thereof from a sludge mixed solution is realized, and through rear-end conveying, carrier recovery and selective enrichment of carrier microorganisms are realized.

Description

Technical Field

[0001] This invention relates to the field of wastewater biochemical treatment enhancement technology, specifically to a separation device and separation and recovery process for a fine powder carrier coated with a biofilm. Background Technology

[0002] Powder-carrier biological fluidized bed technology (such as HPB technology) is an important development direction in the current wastewater treatment field. It significantly increases the concentration of the mixed liquor in the biological treatment tank by adding composite powder carriers, constructing a fluidized bed system with a symbiotic relationship between suspended and attached sludge. This simultaneously enhances nitrogen and phosphorus removal efficiency, enabling wastewater treatment plants to upgrade and expand their capacity while minimizing new land use. The bottleneck in the application of this technology lies in how to efficiently and stably separate and recover the powder carriers and their attached microorganisms (i.e., biological carriers) from the excess sludge and reuse them in the biological treatment tank, in order to maintain the number of carriers and microbial biomass in the system and reduce operating costs.

[0003] In the prior art, such as the patent with announcement number CN114751511A, the patent title is "A Wastewater Treatment System and Method Based on Vortex Separation". This system uses a centrifugal separation device set at the front end of the secondary sedimentation tank to intercept sludge particles and cooperates with a biological carrier hydrocyclone separation device to perform secondary separation, aiming to reduce the load on the secondary sedimentation tank and recover the carrier.

[0004] However, such existing technologies still have significant shortcomings in achieving efficient and stable separation and recovery, mainly in the following aspects: Firstly, using a single hydrocyclone for treatment has limited processing capacity, making it difficult to cope with large-scale or fluctuating inflow loads, thus limiting the system's processing scale. Secondly, the separation efficiency is greatly affected by fluctuations in influent concentration and pressure, resulting in insufficient operational stability and difficulty in ensuring a consistently high carrier recovery rate.

[0005] Therefore, there is an urgent need for a separation device using a fine powder carrier coated with a biofilm that can achieve continuous and efficient separation of products. Summary of the Invention

[0006] Technical problems to be solved In view of the above-mentioned shortcomings of the prior art, the present invention provides a separation device and separation and recovery process for a fine powder carrier coated with a biofilm, which can solve the problems of single separation and recovery function and low efficiency in the prior art.

[0007] Technical solution To achieve the above objectives, the present invention provides the following technical solution: This invention provides a separation device for a fine powder carrier coated with a biofilm, comprising a separation module for separating products from a sludge mixture and a product conveying unit. The separation module includes at least one hydrocyclone with two outlets, which discharge separate products with significantly different contents of two carriers. The product conveying unit includes one or more combinations of a conveying pipeline, a product equalization tank, and a conveying pump, for conveying the products to designated process units.

[0008] Furthermore, it also includes a precision filtration unit for pretreating the sludge mixture to intercept and remove large particulate impurities.

[0009] Furthermore, the precision filtration unit filters out large particulate impurities with a particle size of at least 1 mm.

[0010] Furthermore, it also includes a sludge conditioning tank, which is connected to the outlet of the precision filtration unit and is used to store the filtered sludge mixture.

[0011] Furthermore, several of the aforementioned hydrocyclones are connected in parallel.

[0012] Furthermore, the proportion of carriers in the product containing a large number of carriers is not less than 75% of the total number of carriers in the treated sludge mixture.

[0013] This solution also proposes a separation and recovery process for a fine powder carrier coated with a biofilm, applicable to the separation and recovery device described above, comprising the following steps: S1. Separation step: The sludge mixture containing fine powder carriers coated with biofilm is subjected to hydrocyclone separation treatment to obtain a carrier-rich product with a high carrier content and a carrier-poor product with a low carrier content. S2. Product transfer steps: The two separated products are transferred to different designated process units respectively.

[0014] Beneficial effects The technical solution provided by this invention has the following advantages compared with the prior art: This invention achieves continuous, efficient, and selective separation of fine powder carriers and their loaded biofilms in sludge mixtures by setting up a separation module containing at least one hydrocyclone and a matching separation product conveying unit. The hydrocyclone utilizes the principle of centrifugal force to separate two products with significantly different carrier contents in one step. The conveying unit then transports these two products to different subsequent process units. This integrated device has a compact structure and smooth process, effectively solving the technical problem of efficient separation and directional recovery of powder carriers from mixed liquids, and providing reliable technical equipment for the recycling and reuse of biological carriers. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall process of the separation and recovery device in an embodiment of the present invention; Figure 2 This is a process flow diagram in an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall structure of the separation and recovery device in an embodiment of the present invention; Figure 4 This is a side view of the product conditioning tank in an embodiment of the present invention; Figure 5 This is an aerial view of the main process module in an embodiment of the present invention.

[0017] The numbers in the diagram represent: 100, precision filtration unit; 200, sludge inlet equalization tank; 300, separation module; 310, sludge inlet pump; 400, hydrocyclone. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0022] The present invention will be further described below with reference to embodiments.

[0023] Example: This scheme proposes a separation and recovery process for a fine powder carrier coated with a biofilm, including the following steps: S1. Separation step: The sludge mixture containing fine powder carriers coated with biofilm is subjected to hydrocyclone separation treatment to obtain a carrier-rich product with a high carrier content and a carrier-poor product with a low carrier content. S2. Product transfer steps: The two separated products are transferred to different designated process units respectively.

[0024] Based on the above process, please refer to the appendix. Figure 1-5 This solution also proposes a separation device for fine powder carriers coated with biofilm, which is mainly used for the separation and recycling of biological carriers (i.e. carriers coated with biofilm) in the field of wastewater treatment, and is particularly suitable for the recycling of carrier materials in HPB technology.

[0025] The device adopts a modular design, integrated into a single frame, resulting in a compact and rational structure that facilitates transportation and on-site installation and commissioning. Its workflow follows the sequence of pretreatment, buffer storage, cyclone separation, product collection, and transportation, ultimately achieving efficient recovery and reuse of the carrier material.

[0026] It mainly includes a separation module 300, a separation product conveying unit, a precision filtration unit 100, a sludge inlet regulating tank 200 and a pipeline system. The separation module 300 is composed of multiple hydrocyclones 400 arranged in parallel. Each hydrocyclone 400 has two outlets to discharge two products with different carrier contents. The separation product conveying unit includes a conveying pipeline, a separation product conditioning tank, and a conveying pump. In this embodiment, two separation product conditioning tanks are provided, namely a carrier-rich product conditioning tank and a carrier-poor product conditioning tank. The two are respectively connected to the underflow port and overflow port of the hydrocyclone separation module 300 through a pipeline system, and are used to receive and temporarily store two products with significantly different carrier contents.

[0027] Each equalization tank is equipped with an outlet pipe at the bottom and an independent product transfer pump. The transfer pump can return the carrier-rich product to the biological treatment tank to maintain the carrier concentration, and send the carrier-poor product to the sludge treatment unit or other process units, according to the needs of the subsequent process units.

[0028] It should be noted that the two products can be independently transported to the target unit via any one of the following: pipeline system, equalization tank, or transfer pump.

[0029] This unit ensures that the two products can be independently, stably and controllably transported to different destinations, further enhancing the continuous operation and directional recovery capabilities of the device. The regulating tank is equipped with a stirring structure to prevent sludge deposition and ensure the uniformity and stability of the transport concentration.

[0030] The precision filtration unit 100 is located in front of the separation module and adopts a drum-type bar screen. Its core component is a bar filter cartridge with a filtration accuracy of 1mm. The filter cartridge is horizontally installed inside the outer frame through heavy-duty bearing seats at both ends, which can effectively intercept large particulate impurities such as fibers and hair, avoid clogging of the subsequent hydrocyclone 400, and ensure the continuous and stable operation of the system.

[0031] After pretreatment by the bar screen, the mixed liquid flows into the sludge inlet equalization tank 200 below by gravity. The sludge inlet equalization tank 200 is equipped with a stirrer that runs continuously at low speed to effectively prevent sludge deposition. The tank is equipped with a liquid level sensor to monitor the mixed liquid level in real time.

[0032] The mixed liquor in the sludge equalization tank 200 is transported to the separation module 300 via the sludge pump 310. The inlet pipe pressure of the separation module is not less than 0.3 MPa. Actual operation tests show that the product discharged from the underflow outlet is a carrier-rich product, with the carrier content accounting for 77-80% of the total carrier content of the treated mixed liquor. This product is transported to the biological treatment tank via the equalization tank and pumps to maintain the carrier concentration and functional microbial biomass within the biological system, ensuring the treatment efficiency of the biological system.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A separation device for a fine powder carrier coated with a biofilm, characterized in that, It includes a separation module (300) for separating products from sludge mixture and a separation product conveying unit. The separation module (300) includes at least one hydrocyclone (400) with two outlets to discharge two separation products with significantly different carrier contents. The product separation conveying unit includes one or more combinations of conveying pipelines, product separation regulating tanks, and conveying pumps, used to convey products to designated process units respectively.

2. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, It also includes a precision filtration unit (100) for pretreating the sludge mixture to intercept and remove large particulate impurities.

3. The separation device for a fine powder carrier coated with a biofilm according to claim 2, characterized in that, The precision filtration unit (100) filters out large particulate impurities with a particle size of at least 1 mm.

4. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, It also includes a sludge conditioning tank (200), which is connected to the outlet of the precision filtration unit (100) and is used to store the filtered sludge mixture.

5. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, Several of the aforementioned hydrocyclones (400) are connected in parallel.

6. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, The proportion of carriers in the product containing a large number of carriers is not less than 75% of the total number of carriers in the treated sludge mixture.

7. A separation and recovery process for a fine powder carrier coated with a biofilm, applied to the separation and recovery apparatus as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Separation step: The sludge mixture containing fine powder carriers coated with biofilm is subjected to hydrocyclone separation treatment to obtain a carrier-rich product with a high carrier content and a carrier-poor product with a low carrier content. S2. Product transfer steps: The two separated products are transferred to different designated process units respectively.

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