Separation device for fine powder carrier covered with biological membrane

Abstract

The utility model relates to the technical field of sewage biochemical treatment enhanced technical equipment, in particular to a separation device of a fine powder carrier coated with a biological membrane, which comprises a fine grid unit, a separation module and a product conveying unit from front to back according to a process flow, the highest filtering precision of the fine grid unit does not exceed 3mm; each separation module comprises one or more hydrocyclones arranged in parallel, the hydrocyclones of the same separation module share one sludge inlet pump, and the working conditions and results of the hydrocyclones are the same; discharging two separated products with relatively large carrier content difference from the separation module; and the product conveying unit can be used for conveying the separated products to other appointed process units respectively. Through the arrangement, the continuous, energy-saving, efficient and selective separation of the fine powder carrier and the loaded biological membrane from the sludge mixed liquid is realized, and the carrier recovery and the selective enrichment of carrier microorganisms are realized through rear-end conveying.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater biochemical treatment enhancement technology and equipment, specifically to a separation device 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 patent application CN114751511A, entitled "A Wastewater Treatment System and Method Based on Eddy Separation," the system uses a centrifugal separator installed at the front end of the secondary sedimentation tank to trap sludge particles, and then cooperates with a biological carrier hydrocyclone separator for secondary separation, aiming to reduce the load on the secondary sedimentation tank and recover the carrier. However, such prior art still has significant shortcomings in achieving efficient and stable separation and recovery, mainly in the following aspects: First, the use of a single hydrocyclone has limited processing capacity, making it difficult to cope with large-scale or fluctuating influent loads, thus limiting the system's processing scale; Second, the separation efficiency is greatly affected by fluctuations in influent concentration and pressure, resulting in insufficient operational stability and difficulty in ensuring a continuously high carrier recovery rate.

[0004] Existing technologies, such as patents with publication numbers CN221117089U, CN117401811B, and CN221275443U, disclose a method, system, and equipment for separating biological carriers using a two-stage hydrocyclone separator. This method uses a hydrocyclone to separate two products with high carrier content and increases the carrier recovery rate by increasing the number of stages.

[0005] However, such existing technologies face the following common problems in actual operation:

[0006] On the one hand, wastewater treatment plants have large influent volumes, long transmission distances, and complex sources. Before entering the biological treatment system, the wastewater only undergoes low-precision pretreatment facilities such as coarse and fine screens and grit chambers. Furthermore, most biological treatment structures are outdoors and open, inevitably resulting in the presence of various filamentous impurities (such as fibers and plastics) and large particles with wide particle sizes appearing intermittently in the activated sludge. On the other hand, hydrocyclones require a front-end pump to create pressurized inflow, and the hydrocyclones used in wastewater treatment are mostly small-scale products, meaning the inlet and outlet diameters are relatively small (typically only 10-30mm). Therefore, if the mixed liquor is not... If processed debris is directly introduced into the hydrocyclone, the following problems will inevitably occur: First, due to its deformable nature, filamentous debris is easily entangled in the impeller and mechanical seal, leading to a decrease in pump flow and head, seal failure, or even overload shutdown. Large particles may directly jam the impeller flow channel or cause blade wear, resulting in sudden equipment damage. Furthermore, if it enters the downstream hydrocyclone, filamentous debris is prone to entanglement and accumulation on the inner wall and underflow port of the hydrocyclone, quickly causing blockage and distortion of the centrifugal force field of the cyclone. Large particles will crowd out the particle separation channel and aggravate the erosion of the cone part, shortening the equipment life. Both of these will lead to a sharp decline in classification accuracy and separation efficiency, and may even cause the hydrocyclone separator to malfunction.

[0007] To improve separation and recovery efficiency, this technology employs a two-stage hydrocyclone separation process. However, due to the inherent characteristics of the hydrocyclone separation principle, increasing the number of stages inevitably increases energy consumption. Consequently, the energy input required to obtain a unit product is very high in actual use, which greatly limits its practicality.

[0008] Therefore, there is an urgent need for a device that can achieve the selective separation of fine powder carriers coated with biofilms in a continuous, efficient, stable, and energy-saving manner. Utility Model Content

[0009] Technical problems to be solved

[0010] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a separation device for fine powder carriers coated with biofilm, which can solve the problems of poor continuity, high energy consumption, low efficiency and poor stability of biological carrier separation and recovery in the existing technology.

[0011] Technical solution

[0012] To achieve the above objectives, this utility model provides the following technical solution:

[0013] This invention provides a separation device for a fine powder carrier coated with a biofilm. According to the process flow, it includes a fine grid unit, a separation module, and a separation product conveying unit from front to back. The separation module includes one or more hydrocyclones arranged in parallel. The hydrocyclones in the same separation module share a sludge pump. The separation module discharges separation products with large differences in the content of the two carriers. The separation product conveying unit can convey the separation products to designated process units according to the product properties and process operation requirements.

[0014] Furthermore, the fine grid unit can effectively intercept filamentous debris and large particulate impurities with high aspect ratio, low stiffness, easy deformation, and easy entanglement, with a maximum filtration accuracy of no more than 3mm.

[0015] Furthermore, it also includes a sludge conveying unit, which includes a sludge equalization tank and a sludge pump. The sludge equalization tank is connected to the outlet of the fine bar screen unit and is used to store the sludge mixture after treatment by the fine bar screen unit. The front and rear ends of the pipeline where the sludge pump is located are respectively connected to the sludge equalization tank and the separation module.

[0016] Furthermore, the operating conditions (i.e., sludge flow rate, pressure, etc.) of several hydrocyclones in the same separation module are all the same.

[0017] Furthermore, the operating results (i.e., the product flow rate and properties at the parallel outlets) of several hydrocyclones in the same separation module are all the same.

[0018] Furthermore, several separation modules can be set up in parallel as needed, and their mud inlet pumps can be shared or set up individually.

[0019] Furthermore, the sludge conditioning tank is equipped with a stirring device to prevent sludge deposition.

[0020] Furthermore, the separation product conveying unit includes one or more combinations of a conveying pipeline, a separation product conditioning tank, and a conveying pump.

[0021] Furthermore, the proportion of carriers in the separated product containing a large number of carriers is not less than 75% of the total number of carriers in the treated sludge mixture.

[0022] Beneficial effects

[0023] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0024] This invention effectively intercepts filamentous debris and large particulate impurities in the mixture by setting a fine grid unit with specific enhancement function at the front end of the separation module. This avoids such impurities from causing entanglement, jamming, or wear on the mud pump. At the same time, it eliminates the problems of blockage, flow field distortion, and equipment erosion that are easily caused after the impurities enter the hydrocyclone. This significantly improves the stability and reliability of the mud pump and the entire separation module, and provides a guarantee for the long-term continuous operation of the downstream hydrocyclone.

[0025] This utility model uses one or more hydrocyclones connected in parallel to form a separation module. Compared with the traditional single large-diameter or series (multi-stage) hydrocyclone separation method, the parallel design allows a single hydrocyclone to still use a small-diameter specification to ensure high separation accuracy. At the same time, by connecting multiple units in parallel, it can flexibly cope with large-scale or fluctuating influent loads, effectively solving the problem of limited processing capacity of a single hydrocyclone. While ensuring the carrier recovery rate, it realizes the flexible expansion of the processing scale.

[0026] This invention avoids the high energy consumption problem caused by using multi-stage series cyclone separation in pursuit of high recovery rate through the design of parallel modules; under the protection of fine grid unit, the system has high operational stability and does not need to be shut down for maintenance due to frequent blockage or equipment damage, thereby reducing the energy consumption cost per unit product and significantly improving the economy and practicality of the technology in practical applications.

[0027] This invention, by setting up a separation product conveying unit, can flexibly and directionally convey the two separation products discharged from the hydrocyclone to the process unit according to their different carrier contents and properties, and in combination with the overall process operation or adjustment needs. This achieves precise diversion and resource recycling of the separation products, effectively maintains the dynamic balance of carrier concentration in the biochemical system, and further improves the overall process operation flexibility and control precision. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the separation and recovery device in Embodiment 1 of this utility model;

[0030] Figure 2 This is a flowchart of the process in Embodiment 1 of this utility model;

[0031] Figure 3This is a side view of the product conditioning tank in Embodiment 1 of this utility model;

[0032] Figure 4 This is a bird's-eye view of the main process module in Embodiment 1 of this utility model;

[0033] Figure 5 This is a schematic diagram of the process flow in Embodiment 2 of this utility model;

[0034] Figure 6 This is a schematic diagram of the process flow in Comparative Example 1 of this utility model.

[0035] The labels in the diagram represent: 100, fine bar screen unit; 200, sludge inlet regulating tank; 300, separation module; 310, sludge inlet pump; 400, hydrocyclone. Detailed Implementation

[0036] 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 present 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, not the entire structure.

[0037] In the description of this utility model, 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 utility model based on the specific circumstances.

[0038] 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.

[0039] 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] The present invention will be further described below with reference to the embodiments.

[0041] Example 1:

[0042] Please refer to the appendix. Figure 1-4 This solution proposes a separation device for fine powder carriers coated with biofilm, which is mainly used for the separation and recovery of biological carriers (i.e. carriers coated with biofilm) in the field of wastewater treatment. It is particularly suitable for the selective and recyclable use of carrier materials in HPB technology and the recovery of specific products when process adjustment is required.

[0043] 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, material conveying, cyclone separation, and product collection and conveying, ultimately achieving efficient recovery and reuse of the carrier material.

[0044] In this embodiment, the sludge mixture to be treated first enters the fine screen unit 100 for pretreatment. This unit uses a rotary drum screen, which can effectively remove filamentous debris with high aspect ratio, easy bending, and easy entanglement (such as fibers and hair mixed in the mixture) and large particulate impurities (such as mud and sand), with a filtration accuracy of 1 mm. This unit not only avoids clogging of subsequent equipment, but also regulates the particle size distribution of the material entering the subsequent cyclone separation unit, ensuring the high efficiency and stability of cyclone separation.

[0045] After being filtered by the fine bar unit 100, the mixed liquor flows into the sludge equalization tank 200 by gravity. The equalization tank is equipped with a stirring device to prevent sludge deposition and maintain a uniform and stable concentration of the mixed liquor.

[0046] The mixed liquor in the sludge equalization tank 200 is transported to the separation module 300 via the sludge pump 310. Two separation modules 300 are arranged in parallel, each including four hydrocyclones 400 connected in parallel. The four hydrocyclones 400 in the same separation module share one sludge pump 310. The mixed liquor enters each hydrocyclone 400 in each separation module 300 via the sludge pump, where product separation occurs under centrifugal force. During operation, the sludge flow rate and pressure of each hydrocyclone in each separation module 300 are the same, both being 20 m³ / s.3 / h and 0.3MPa.

[0047] The flow rates and properties of the products from the parallel outlets of each hydrocyclone 400 in each separation module 300 are identical, and the products from each outlet are collected and discharged separately. The product discharged from the underflow outlet is rich in carrier, while the product discharged from the overflow outlet is lean in carrier. The flow rate ratio of the overflow outlet to the underflow outlet is approximately 6 / 4, and the carrier content of the underflow outlet product (i.e., the carrier-rich product) accounts for 77-80% of the total carrier content of the treated mixture.

[0048] The two separation products enter the separation product conveying unit respectively, and are then conveyed to the designated process unit according to the process operation requirements; under normal circumstances, the carrier-rich product is returned to the biochemical system, while the carrier-poor product is discharged and disposed of along with the remaining sludge.

[0049] The separation device for the biofilm-coated fine powder carrier provided in this embodiment effectively removes filamentous debris and large particulate impurities in the mixture that are prone to clogging and wear by setting a rotary drum fine grid unit with a filtration accuracy of 1 mm at the front end, thus creating favorable conditions for the stable operation of the subsequent separation unit.

[0050] By adopting the design of "parallel modules + shared sludge pump", the advantages of small diameter and high precision separation of a single hydrocyclone are guaranteed, while the processing scale can be flexibly expanded, overcoming the limitation of the processing capacity of a single hydrocyclone.

[0051] Compared to multi-stage series hydrocyclone separation, this device employs a single-stage parallel separation module, avoiding the progressively increasing energy consumption and process complexity associated with multi-stage series separation. While ensuring carrier recovery rates, it significantly reduces operating costs, enhancing the system's economy and practicality. By incorporating a product delivery unit, carrier-rich products can be precisely recycled back to the biochemical system, while carrier-poor products are disposed of externally, achieving efficient reuse of carrier resources. The device features a compact structure, stable operation, and low energy consumption, enabling continuous, efficient, and selective separation of fine powder carriers coated with biofilms, demonstrating significant practical value.

[0052] Example 2:

[0053] See attached document Figure 6 As shown in the process flow diagram, this scheme proposes a separation device for a fine powder carrier coated with a biofilm. The device mainly includes a fine bar screen unit, a sludge inlet equalization tank, a sludge inlet pump, a separation module, a separation product conveying unit, and a piping system. The fine bar screen unit has a filtration accuracy of 2 mm, and the separation module includes a hydrocyclone with two outlets: an overflow outlet and a bottom flow outlet.

[0054] A continuous test experiment was conducted using an experimental setup to recover biological carriers from the residual sludge discharged from the bottom of the secondary sedimentation tank of a wastewater treatment plant using HPB technology. The total operating power of the experimental setup was 8 kW, including a 5.5 kW sludge inlet pump, and the inlet pressure of the separation module was maintained at 0.3 MPa.

[0055] During a single test, the device operated continuously for 12 hours without interruption, processing 20m³ of data. 3 / h, its overflow outlet product is lean carrier product, and the underflow outlet product is rich carrier product. The ratio of overflow outlet flow rate to underflow outlet flow rate is 6 / 4. The proportion of carrier in the rich carrier product to the total carrier in the sludge (i.e., carrier recovery rate) is 82%.

[0056] Comparative Example 1:

[0057] See attached document Figure 6 The process flow shown illustrates an experimental setup with a two-stage hydrocyclone separation module. Under the same sludge inlet conditions as in Example 2, a continuous biological carrier recovery test was conducted on the residual sludge discharged from the bottom of the secondary sedimentation tank of the same wastewater treatment plant using HPB technology. The setup mainly includes a sludge inlet equalization tank, a primary hydrocyclone sludge inlet pump, a primary separation module, a secondary hydrocyclone sludge inlet pump, a secondary separation module, a separation product conveying unit, and a piping system. The sludge inlet pump, separation module, and hydrocyclone separator used in this experimental setup are all the same as in Example 2.

[0058] The total operating power of the experimental setup was 12kW, with two sludge pumps totaling 11kW. The inlet pressure of each separation module was maintained at 0.3MPa. Due to hydrocyclone blockage caused by large particles and long fibers carried in the sludge, the setup was interrupted five times during the 12-hour test, with the shortest continuous operating time being only 45 minutes. Because cleaning the blocked hydrocyclones was time-consuming, the total throughput during the test was approximately 55% of the designed capacity. Based on the products obtained during normal operation, the final product (i.e., the secondary separation module) showed a carrier-rich product to carrier-poor product flow ratio of 58 / 42, and the carrier content in the carrier-rich product accounted for 61.5% of the total carrier content in the sludge (i.e., carrier recovery rate).

[0059] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 this utility model.

Claims

1. A separation device for a fine powder carrier coated with a biofilm, characterized in that, According to the process flow, it includes a fine bar screen unit (100), a separation module (300), and a separation product conveying unit from front to back. The separation module (300) includes one or more hydrocyclones (400) arranged in parallel. The hydrocyclones (400) in the same separation module (300) share a sludge pump. The separation module (300) discharges two separation products with large differences in the content of two carriers. The separated product conveying unit can convey the separated products to designated process units according to the product properties and process operation requirements.

2. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, The fine grid unit (100) can effectively intercept filamentous debris and large particulate impurities with high aspect ratio, low stiffness, easy deformation and easy entanglement, with a maximum filtration accuracy of no more than 3 mm.

3. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, It also includes a sludge conveying unit, which includes a sludge regulating tank (200) and a sludge pump (310). The sludge regulating tank (200) is connected to the outlet of the fine bar screen unit (100) and is used to store the sludge mixture after treatment by the fine bar screen unit. The front and rear ends of the pipeline where the sludge pump (310) is located are connected to the sludge regulating tank (200) and the separation module (300), respectively.

4. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, The sludge inlet flow rate and pressure of several hydrocyclones (400) in the same separation module are all the same.

5. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, The product flow rate and properties of the parallel outlets of several hydrocyclones (400) in the same separation module are all the same.

6. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, Several separation modules can be set up in parallel as needed, and their mud inlet pumps can be shared or set up individually.

7. The separation device for a fine powder carrier coated with a biofilm according to claim 3, characterized in that, The sludge conditioning tank (200) is equipped with a stirring device to prevent sludge deposition.

8. The separation device for a fine powder carrier coated with a biofilm according to claim 1, characterized in that, The separation product conveying unit includes one or more combinations of conveying pipelines, separation product conditioning tanks, and conveying pumps.

9. 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 separated product with a large number of carriers is not less than 75% of the total number of carriers in the treated sludge mixture.

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