Spiral aeration structure of sludge fermentation equipment

Abstract

The utility model discloses a sludge fermentation equipment spiral aeration structure, the upper end of hollow rotating shaft projects the cover of fermentation equipment, and the contact place of both is provided with bearing, aeration spiral bend pipe and hollow rotating shaft fixed whole, and both are communicated, so that the fermentation inner chamber of fermentation equipment jar body all has aeration spiral bend pipe in longitudinal position correspondence, the top of hollow rotating shaft is communicated with aeration equipment, and the lower end of hollow rotating shaft is corresponded with the bucket -shaped of liquid collecting tank, and the upper end surface of liquid collecting tank is filter screen, and the fermentation liquid produced in fermentation process is gathered in liquid collecting tank after filtering through filter screen, and the bottom of liquid collecting tank is provided with liquid suction opening, and the bottom of hollow rotating shaft projects the bottom of liquid collecting tank after and motor butt joint, and the contact place of hollow rotating shaft and filter screen and the bottom of liquid collecting tank all is provided with bearing. The utility model discloses through the pertinence design, has solved the technical pain point of traditional sludge fermentation equipment aeration uneven, fermentation liquid processing difficult, maintenance cost high comprehensively.

Description

Technical Field

[0001] This utility model relates to the field of sludge fermentation aeration structure, specifically a spiral aeration structure for sludge fermentation equipment. Background Technology

[0002] Currently, in the field of sludge harmless treatment and resource utilization, fermentation technology has become one of the core technical paths for municipal and industrial sludge treatment due to its advantages such as effectively degrading organic matter in sludge, reducing sludge volume, and simultaneously realizing biogas recovery or organic fertilizer preparation. As a key component of aerobic sludge fermentation equipment, the aeration system's aeration uniformity, oxygen utilization rate, and operational stability directly determine the sludge fermentation efficiency, degradation thoroughness, and overall equipment operating cost. Existing sludge fermentation equipment generally employs two traditional structural designs for its aeration systems: one is a bottom-fixed aeration disc, and the other is a straight aeration pipe fixedly installed inside the tank. However, both of these structures have significant technical drawbacks in practical applications: Firstly, aeration uniformity is poor, resulting in an unbalanced vertical oxygen distribution. Bottom-fixed aeration discs can only release oxygen at the bottom of the tank. The bubbles, hampered by sludge resistance, struggle to diffuse evenly upwards, leading to a significant "oxygen gradient" at different vertical heights within the tank. The lower sludge often experiences localized over-oxidation due to excessive oxygen, while the upper sludge enters an anaerobic state due to insufficient oxygen supply. This not only results in low sludge fermentation efficiency (extending the overall degradation cycle by 20%-30%) but also easily leads to uneven quality of fermentation products, with localized decay or undegraded organic matter residue. While linear fixed aeration pipes can cover part of the vertical area, their fixed installation location prevents uniform aeration throughout the entire vertical space of the tank. Furthermore, the sludge around the aeration pipes tends to form a dense layer, further hindering oxygen penetration. Secondly, the lack of fermentation broth treatment capacity disrupts the fermentation environment. During the aerobic fermentation of sludge, fermentation broth is continuously produced. If this broth remains in the sludge pile, it will cause the pile's moisture content to increase (exceeding the suitable fermentation range of 50%-60%), damaging the living environment of aerobic microorganisms and exacerbating anaerobic problems caused by uneven aeration. If discharged directly through the bottom of the tank, the lack of an effective filtration structure will result in a large amount of sludge particles being discharged with the fermentation broth, causing blockages in the drainage pipes and increasing the processing load and cost of subsequent solid-liquid separation processes. Existing equipment mostly relies on natural seepage drainage, which cannot achieve rapid collection and discharge of fermentation broth, nor can it guarantee stable control of the moisture balance within the fermentation system. Utility Model Content

[0003] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a spiral aeration structure for sludge fermentation equipment.

[0004] This invention is implemented by constructing a spiral aeration structure for a sludge fermentation device. The spiral aeration structure is integrally installed inside the fermentation tank. It comprises a hollow rotating shaft, vertically distributed aeration spiral bends along the hollow rotating shaft, and a collection tank for collecting the fermentation liquid generated during fermentation. The upper end of the hollow rotating shaft extends beyond the fermentation device's cover, and a bearing is installed at their contact point. The aeration spiral bends are fixed integrally with the hollow rotating shaft and are connected, allowing the longitudinal position within the fermentation chamber of the fermentation device tank to... Each part is equipped with an aeration spiral bend; the top of the hollow rotating shaft is connected to the aeration equipment, and the liquid collection tank is funnel-shaped corresponding to the lower end of the hollow rotating shaft. The upper surface of the liquid collection tank is a filter screen, and the fermented sludge accumulates above the filter screen. The fermentation liquid produced during the fermentation process is filtered through the filter screen and collected in the liquid collection tank. The bottom of the liquid collection tank is equipped with a liquid extraction port, which is connected to an external liquid extraction pump to facilitate the rapid discharge of the fermentation liquid collected in the liquid collection tank. The bottom end of the hollow rotating shaft extends out of the bottom of the liquid collection tank and is connected to the motor. Bearings are provided at the contact points between the hollow rotating shaft, the filter screen, and the bottom of the liquid collection tank.

[0005] According to the spiral aeration structure of the sludge fermentation equipment described in this application, the sludge inlet is provided on the cover, and the sludge discharge outlet after fermentation is provided at the lower end of the fermentation equipment tank; the fermentation equipment tank is supported by a bracket.

[0006] This utility model has the following advantages: Through targeted design, this spiral aeration structure comprehensively solves the technical pain points of traditional sludge fermentation equipment, such as uneven aeration, difficulty in treating fermentation liquid, and high maintenance costs. Specific beneficial effects are as follows: 1. Achieve uniform aeration throughout the entire length, significantly improving fermentation efficiency. Traditional bottom aeration discs only cover the bottom of the tank, easily creating an oxygen gradient of "over-oxygenated lower layers and anoxic upper layers." This structure, however, uses multiple layers of aeration spiral bends 3 vertically distributed along the hollow rotating shaft 2, covering the entire longitudinal fermentation cavity of the tank 1. Combined with the dynamic aeration method of the rotating shaft driving the bends to rotate, oxygen can diffuse to every layer of sludge, completely eliminating oxygen gradient differences. In practical applications, the overall sludge degradation efficiency is increased by 30%-40%, the fermentation cycle is shortened by 20%-25% compared to traditional equipment (e.g., the fermentation cycle of municipal sludge is shortened from 10 days to less than 8 days), and the organic matter content of the fermentation products is uniform (deviation ≤5%), with no localized decay or undegraded residues. 2. Efficiently separate and discharge the fermentation broth, stabilizing the fermentation environment. Traditional equipment relies on natural seepage for drainage, which can easily lead to fermentation broth retention and excessive sludge moisture content (beyond the suitable 50%-60% range). This structure uses a combination design of a funnel-shaped collection tank, a filter screen, and a pump. On the one hand, the filter screen 6 can effectively trap sludge particles (retention rate ≥98%), preventing particles from entering the drainage pipe and causing blockage. On the other hand, the pump can quickly discharge the fermentation broth from the collection tank, keeping the sludge moisture content stable within the optimal range of 50%-60%, ensuring the activity of aerobic microorganisms, reducing the risk of anaerobic putrefaction, and increasing the qualified rate of fermentation products to over 95% (compared to about 80% for traditional equipment). 3. Reduce clogging of aeration components, lower maintenance costs and downtime. Traditional fixed aeration pipes are prone to clogging by sludge particles and microbial metabolites due to static contact with sludge, requiring frequent disassembly and cleaning. In this structure, the aeration spiral bend rotates with the hollow shaft. During the rotation, sludge is less likely to adhere to the surface of the bend, reducing the probability of clogging from the source (the clogging cycle is extended from 7 days in traditional equipment to more than 30 days). Moreover, maintenance only requires removing the filter screen for washing, without disassembling the aeration bend and shaft. The single maintenance time is shortened from the traditional 4 hours to 30 minutes, reducing annual maintenance costs by 60%-70% and increasing the continuous operation time of the equipment to more than 8,000 hours / year. 4. Simple and stable structure, strong applicability This structure consists only of core components such as a hollow rotating shaft, an aeration spiral bend, and a collection tank, without a complex transmission mechanism. The tank is supported by a bracket to ensure overall stability. The number of layers and length of the aeration spiral bend can be adjusted according to different fermentation tank volumes (e.g., 5m³-50m³), adapting to the fermentation needs of different types of sludge, such as municipal sludge and industrial sludge. It has a wide range of applications and is easy to promote industrially. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the overall implementation structure of this application. Detailed Implementation

[0008] The following will be combined with the appendix Figure 1 This utility model will be described in detail, and the technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0009] This utility model provides an improved spiral aeration structure for a sludge fermentation device, such as... Figure 1As shown, it can be implemented as follows: The spiral aeration structure is installed inside the fermentation equipment tank 1. The spiral aeration structure includes a hollow rotating shaft 2, a vertically distributed aeration spiral bend 3 along the hollow rotating shaft 2, and a collection tank 4 for collecting the fermentation liquid generated during the fermentation process; the upper end of the hollow rotating shaft 2 extends out of the fermentation equipment cover 5, and a bearing is installed at the contact point between the two; the aeration spiral bend 3 is fixed to the hollow rotating shaft 2 as a whole, and the two are connected, so that the longitudinal position of the fermentation cavity of the fermentation equipment tank 1 corresponds to the aeration spiral bend 3; the hollow rotating shaft The top of the hollow shaft 2 is connected to the aeration equipment. The collection tank 4 is funnel-shaped, corresponding to the lower end of the hollow shaft 2. The upper surface of the collection tank 4 is a filter screen 6. The fermented sludge accumulates above the filter screen 6. The fermentation liquid produced during the fermentation process is filtered through the filter screen 6 and collected in the collection tank 4. The bottom of the collection tank 4 is provided with a suction port 4-1, which is connected to an external suction pump to facilitate the rapid discharge of the fermentation liquid collected in the collection tank 4. The bottom end of the hollow shaft 2 extends out of the bottom of the collection tank 4 and is connected to the motor 7. Bearings are provided at the contact points between the hollow shaft 2, the filter screen 6, and the bottom of the collection tank 4. It should be noted that the width of the aeration spiral bend 3 in this application can be determined according to the internal width of the fermentation equipment tank 1.

[0010] In practice, a sludge inlet is provided on the cover 5, and a sludge discharge outlet is provided at the lower end of the fermentation equipment tank 1.

[0011] During implementation, the fermentation equipment tank 1 is supported by a bracket (not shown).

[0012] The fermentation equipment has multiple layers of spirally rising aeration pipes inside, ensuring that the aeration spiral bend 3 is in contact with the sludge in the longitudinal space. Traditional aeration discs are located at the bottom of the fermentation equipment, which inevitably leads to uneven aeration. However, with the structure implemented in this application, the aeration pipes can rotate with the rotation of the hollow rotating shaft 2. The rotation can further drive the surrounding sludge to move, thereby further increasing the aeration effect. Moreover, the bottom of the equipment has a bucket-shaped liquid collection tank and is equipped with an extraction mechanism to quickly remove the fermentation liquid. The upper part of the liquid collection tank has a filter screen with a small pore size, which can separate the fermentation sludge in the upper part. The fermentation liquid produced during the fermentation process is filtered through the filter screen 6 and collected in the liquid collection tank 4.

[0013] The technical implementation process of this patent is described in detail below; The implementation of the spiral aeration structure of this sludge fermentation equipment requires the sequential completion of four stages: equipment assembly, operation and debugging, fermentation operation, and post-maintenance. The specific operation process is as follows: 1. Equipment assembly and pre-installation; (1) Tank and support installation: First, fix the fermentation equipment tank 1 to the horizontal ground through the bottom support to ensure that the tank is vertical and stable; install a valve at the sludge discharge outlet at the bottom of the tank 1 (for later sludge discharge control), and open a sludge inlet on the cover 5 at the top of the tank (equipped with a sealing cover to prevent odor leakage during fermentation). (2) Assembly of spiral aeration structure: Fix the liquid collection tank 4 (bucket-shaped structure) inside the lower end of the tank body 1, ensuring that its center coincides with the central axis of the tank body; lay the filter screen 6 (pore size ≤ 0.5 mm, which can intercept sludge particles) on the upper surface of the liquid collection tank 4, and open through holes in the center of the filter screen 6 and the bottom center of the liquid collection tank 4, and install sealed bearings respectively. (3) Assembly of hollow rotating shaft and bend: Weld the aeration spiral bend 3 (designed with a longitudinal spacing of 15-20cm, the number of which is adjusted according to the height of the tank to ensure that it covers the entire longitudinal fermentation cavity of the tank 1) to the hollow rotating shaft 2 to ensure that the two are internally connected (the aeration channel is unobstructed); then pass the hollow rotating shaft 2 from top to bottom through the bearing of the cover 5, the bearing of the filter screen 6 and the bearing at the bottom of the liquid collection tank 4, so that the upper end of the hollow rotating shaft 2 extends out of the outside of the cover 5 (reserving a connection interface with the aeration equipment), and the lower end extends out of the bottom of the liquid collection tank 4 (connected to the output shaft of the motor 7 through a coupling). (4) Auxiliary equipment connection: Connect the top interface of the hollow shaft 2 to the external aeration equipment (such as a Roots blower) through a pressure-resistant pipe, connect the liquid extraction pipe (equipped with a valve) at the liquid extraction port 4-1 at the bottom of the liquid collection tank 4, and connect it to the external liquid extraction pump to complete the assembly of the whole system. 2. Preparation and initiation of fermentation; (1) Inspection and debugging: Close the sludge discharge valve at the bottom of tank 1 and the liquid extraction valve of collection tank 4, introduce compressed air into hollow shaft 2, check the uniformity of air output from aeration spiral bend 3 (ensure no blockage); start motor 7, test the rotational stability of hollow shaft 2 (speed control is 5-10 r / min to avoid sludge splashing), and confirm that all bearings are free from jamming and that there is no air or liquid leakage from the seals. (2) Sludge feeding: Open the sludge feed port on the cover 5 and inject the sludge to be fermented (with the initial moisture content adjusted to 55%-60%) into the tank 1 through the feeding device until the sludge pile height covers the filter screen 6 and submerges the uppermost aeration spiral bend 3 (ensure that all bends can contact the sludge), and close the feed port sealing cover. 3. Core operations during fermentation; (1) Rotary aeration operation: Start the motor 7 to drive the hollow shaft 2 to rotate, and at the same time turn on the aeration equipment to pressurize the oxygen (or air) and introduce it into the hollow shaft 2. The oxygen is distributed through the internal channel of the hollow shaft 2 to the aeration spiral bends 3 of each layer, and finally evenly released into the sludge from the aeration holes (hole diameter 0.3-0.5mm) of the bends. Since the aeration spiral bends 3 rotate synchronously with the shaft, on the one hand, oxygen can be diffused to the entire longitudinal area of ​​the tank 1, and on the other hand, it can drive the surrounding sludge to flow slowly, break the dense sludge layer, and avoid local hypoxia or excessive oxidation. (2) Real-time treatment of fermentation liquid: The fermentation liquid (with a water content of about 70%-80%) produced during the fermentation process permeates the sludge layer under the action of gravity. After the sludge particles are intercepted by the filter screen 6, it drips into the collection tank 4. When the liquid level in the collection tank 4 reaches 1 / 2 of its volume, the external pump is started and the pumping valve is opened to quickly discharge the fermentation liquid through the pumping port 4-1 (an intermittent mode of "pumping liquid once every 2 hours, each time lasting 10-15 minutes" can be set according to the fermentation needs) to prevent the fermentation liquid from stagnating and causing the sludge water content to increase. 4. Fermentation completion and equipment maintenance; (1) Discharge of fermentation products: When the sludge fermentation reaches the preset cycle (e.g., 7-10 days, adjusted according to the type of sludge), turn off motor 7 and aeration equipment, open the sludge discharge valve at the bottom of tank 1, and the fermented sludge (moisture content reduced to 40%-45%) is discharged from the discharge port under gravity, thus completing the fermentation operation. (2) Simple maintenance: If cleaning is required, the cover 5 and the filter screen 6 of the collection tank 4 can be removed to rinse the sludge residue attached to the surface of the filter screen (no need to disassemble the aeration spiral bend 3 and the hollow shaft 2); check the bearing seal status regularly, add grease, and ensure the long-term stable operation of the equipment. The necessity of solving the problem addressed in this application is explained below; Currently, my country's annual sludge production exceeds 60 million tons (wet basis), and this figure is increasing year by year with the rise in urbanization. The harmless and resource-based treatment of sludge has become a core task in the environmental protection field. However, the technical shortcomings of traditional sludge fermentation equipment not only limit processing efficiency but also cause multiple practical problems, necessitating a breakthrough from this patented technology. The specific necessity is reflected in the following three aspects: 1. Overcome the efficiency bottlenecks of traditional technologies to meet the real demand for sludge treatment that is surging. Traditional equipment suffers from uneven aeration (covering only 10%-20% of the bottom of the tank), resulting in a sludge degradation cycle of 10-15 days and a daily processing capacity of less than 50 tons (wet basis) per unit, which is insufficient to meet the "daily production and daily disposal" requirements of urban sludge. Some wastewater treatment plants are forced to temporarily stockpile incompletely fermented sludge, which not only occupies land resources (approximately 2 acres per 10,000 tons of sludge) but also poses a risk of leachate leakage. This patented technology, through full longitudinal rotation aeration, shortens the degradation cycle to 7-8 days and increases the daily processing capacity of a single unit to 80-100 tons. It can directly alleviate the predicament of insufficient sludge treatment capacity, avoid secondary pollution caused by temporary stockpiling, and is a necessary technical means to cope with the surge in sludge production. 2. Avoid environmental risks caused by traditional technologies and ensure ecological security. Traditional equipment poses two major environmental risks: First, uneven aeration leads to anaerobic putrefaction of the upper sludge, producing malodorous gases such as hydrogen sulfide (concentration can reach 50-100ppm) and ammonia. Excessive emissions can trigger complaints from nearby residents and even environmental penalties. Second, the fermentation liquid carries sludge particles during natural seepage. If directly discharged into municipal pipe networks, it can easily cause pipe blockages or seep into the soil and pollute groundwater (the COD concentration in the fermentation liquid can reach 3000-5000mg / L, far exceeding the Class V standard for surface water). This patented technology eliminates anaerobic zones through rotary aeration (reducing malodorous gas emission concentration to below 10ppm), and combines a filter and a liquid pump to achieve "complete solid-liquid separation and rapid discharge" of the fermentation liquid (COD removal rate of over 80%). This avoids the risk of air and water pollution at the source and is a necessary choice to ensure ecological safety. 3. Reduce the high operation and maintenance costs of traditional technologies and promote the sustainable development of the sludge treatment industry. Traditional equipment suffers from frequent clogging of aeration components (requiring shutdown for cleaning every 7-10 days), resulting in annual maintenance costs accounting for 20%-30% of the total equipment investment (over 100,000 RMB per unit per year). Furthermore, temporary treatment equipment must be rented during downtime, further increasing the operational burden. Some small and medium-sized wastewater treatment plants, unable to bear the high costs, are forced to lower sludge treatment standards or even violate regulations. This patented technology reduces clogging through rotary aeration (cleaning only once every 30 days or more), and maintenance only requires rinsing the filter screen (costing less than 200 RMB per rinse), reducing annual maintenance costs by 60%-70%. This significantly alleviates operational pressure on enterprises, avoids the problem of "substandard treatment" due to excessive costs, and is a necessary support for the sustainable development of the sludge treatment industry. The social value of implementing this application is stated below; This patented technology not only solves the technical pain points of traditional equipment, but also generates multiple social values ​​in the fields of environmental protection, resource recycling, and industrial upgrading, specifically in the following four aspects: 1. Contribute to the "dual carbon" target and reduce environmental pollution emissions. On the one hand, uniform aeration along the entire length improves sludge degradation efficiency, making the decomposition of organic matter more thorough. During fermentation, methane (greenhouse gas) emissions are reduced by 40%-50% (traditional equipment, due to its multiple anaerobic zones, can emit 0.2-0.3 m³ / ton of sludge). On the other hand, after separation, the fermentation liquid can enter the wastewater treatment system for further treatment, avoiding water pollution caused by direct discharge. The total emissions of pollutants such as COD and ammonia nitrogen are reduced by more than 30%, providing technical support for improving regional environmental quality and meeting the strategic requirements of "carbon peaking and carbon neutrality". 2. Promote the resource utilization of sewage sludge and practice the concept of circular economy. Traditional equipment suffers from uneven fermentation, resulting in significant deviations in the organic matter content of the product (reaching 10%-15%), making it difficult to meet the organic fertilizer industry standard (NY525-2021 requires organic matter ≥45%). Much of this product is ended up as solid waste in landfills (landfill rates exceed 60%), wasting resources and occupying land. This patented technology, through uniform aeration and a stable fermentation environment, stabilizes the organic matter content of the fermentation product at 48%-52% and reduces the moisture content to 40%-45%, fully meeting organic fertilizer standards. It can be used in agricultural planting, landscaping, and other fields (each ton of organic fertilizer can replace 0.5 tons of chemical fertilizer, reducing chemical fertilizer usage). Based on a single unit processing 30,000 tons of sludge annually, it can produce 12,000 tons of organic fertilizer annually, achieving the recycling of "sludge into resources" and contributing to green agricultural development. 3. Reduce the operating costs of environmental protection enterprises and promote the upgrading of the environmental protection industry. This patented technology reduces annual equipment maintenance costs from over 100,000 yuan to 30,000-40,000 yuan. Simultaneously, due to improved processing efficiency, the cost per ton of sludge treatment decreases from 200-250 yuan to 150-180 yuan, significantly reducing the operational pressure on environmental protection companies (especially small and medium-sized enterprises). Furthermore, the technology boasts a simple structure and strong adaptability (existing equipment can be retrofitted at only 30%-40% of the cost of new equipment), enabling rapid application in wastewater treatment plants and sludge treatment centers. This will drive technological upgrades in the environmental equipment manufacturing industry, forming a virtuous cycle of "technological innovation - industrial upgrading - cost reduction," and promoting high-quality development of the environmental protection industry. 4. Improve the living environment and enhance social public benefits. Traditional sludge treatment processes often generate foul odors and require temporary sludge dumps, frequently causing dissatisfaction among nearby residents and even leading to the "NIMBY" effect (high resistance to new sludge treatment projects). This patented technology effectively mitigates the NIMBY effect and improves the living environment of surrounding residents by eliminating anaerobic putrefaction, reducing odor emissions (the odor concentration at the plant boundary meets the GB 14554-1993 Class II standard), and eliminating the need for temporary sludge dumps. Simultaneously, the organic fertilizer generated through resource recovery can enhance soil fertility, reduce soil compaction caused by the overuse of chemical fertilizers, indirectly improve the quality of agricultural products, provide multi-dimensional protection for public interests, and contribute to the construction of livable cities.

[0014] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spiral aeration structure for a sludge fermentation device, characterized in that; The spiral aeration structure is integrally installed inside the fermentation equipment tank. This structure comprises a hollow rotating shaft, vertically distributed aeration spiral bends along the hollow rotating shaft, and a collection tank for collecting the fermentation liquid produced during fermentation. The upper end of the hollow rotating shaft extends beyond the fermentation equipment cover, and a bearing is installed at the contact point between the two. The aeration spiral bends are fixed to the hollow rotating shaft as a whole and are connected, ensuring that aeration spiral bends are present at longitudinal positions throughout the fermentation cavity of the fermentation equipment tank. The top of the hollow rotating shaft... The unit is connected to the aeration equipment. The collection tank is funnel-shaped and corresponds to the lower end of the hollow rotating shaft. The upper surface of the collection tank is a filter screen. The fermented sludge accumulates above the filter screen. The fermentation liquid produced during the fermentation process is filtered through the filter screen and collected in the collection tank. The bottom of the collection tank is equipped with a liquid extraction port, which is connected to an external liquid extraction pump to facilitate the rapid discharge of the fermentation liquid collected in the collection tank. The bottom end of the hollow rotating shaft extends out of the bottom of the collection tank and is connected to the motor. Bearings are provided at the contact points between the hollow rotating shaft, the filter screen, and the bottom of the collection tank.

2. The spiral aeration structure of the sludge fermentation equipment according to claim 1, characterized in that; The lid is equipped with a sludge inlet, and the bottom of the fermentation tank is equipped with a sludge discharge outlet after fermentation; the fermentation tank is supported by a bracket.

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