A sewage treatment station and a method for reconstructing the same

Abstract

The present application relates to the field of building construction technology, specifically refers to a sewage treatment station and its reconstruction construction method, including sewage pool, grid pool, adjusting pool, sedimentation tank and disinfection tank connected in turn through pipeline, it also includes the anoxic tank arranged between adjusting pool and sedimentation tank through pipeline connection, the anoxic tank is also connected with the contact oxidation tank through pipeline, the contact oxidation tank includes contact frame, the aeration frame is arranged below the contact frame, the aeration frame is connected with fan, and the aeration frame is provided with aeration group, each aeration group includes a pair of aeration blades, and each aeration blade is communicated with aeration frame.The design of aeration blade makes oxygen can be evenly distributed, increases the dissolved oxygen in sewage, promotes the activity of aerobic microorganisms, so as to accelerate the decomposition of organic matter, the above structure not only improves the efficiency of sewage treatment, and by increasing the setting of aeration group, enhances the degradation ability of pollutants in sewage, realizes the deeper purification effect.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a sewage treatment plant and its renovation construction method. Background Technology

[0002] Hospital wastewater sources are complex and treatment is challenging. With the development and construction of hospitals and the improvement of environmental standards, the volume of hospital wastewater treatment is increasing year by year, and discharge standards are becoming increasingly stringent. Some hospital wastewater treatment plants were built relatively early and often suffer from problems such as simple processes, aging equipment, outdated facilities, and unreasonable selection of operating parameters. Therefore, they cannot meet the requirements of increasing wastewater volume and stable compliance with discharge standards. Thus, upgrading and transforming hospital wastewater treatment plants is crucial.

[0003] However, since the hospital continues to operate, the sewage treatment plant cannot be shut down during the upgrade and renovation process. The requirements for the upgrade and renovation construction process and construction organization are extremely strict to ensure that the sewage treatment plant operates normally and the discharged water quality meets the requirements of environmental protection policies during the renovation and construction process. Summary of the Invention

[0004] The purpose of this invention is to provide a wastewater treatment plant to solve the problem that existing wastewater treatment plants cannot meet the increased wastewater volume; and to provide a method for retrofitting a wastewater treatment plant to ensure the normal operation of wastewater treatment during the retrofitting process without suspending the use of the wastewater treatment plant.

[0005] This invention is achieved through the following technical solution: A wastewater treatment plant includes a wastewater tank, a bar screen tank, an equalization tank, a sedimentation tank, and a disinfection tank connected sequentially by pipelines. It also includes an anoxic tank located between the equalization tank and the sedimentation tank via a pipeline. The anoxic tank is further connected to a contact oxidation tank via a pipeline. The contact oxidation tank includes a contact frame, an aeration frame located below the contact frame, a blower connected to the aeration frame, and aeration groups on the aeration frame. Each aeration group includes a pair of aeration plates, and each aeration plate is connected to the aeration frame.

[0006] Furthermore, the aeration plate includes an aeration plate body and four contact areas disposed on the end face of the aeration plate body, and the contact areas of each pair of aeration plates are arranged opposite to each other. The contact area includes a plurality of contact pieces, and the plurality of contact pieces are all in communication with the interior of the aeration plate body. The contact pieces are also provided with a plurality of through holes.

[0007] Furthermore, the regulating pool is connected to an emergency accident pool via a pipeline.

[0008] Furthermore, a central cylinder is provided inside the sedimentation tank.

[0009] Furthermore, the contact piece is bent and disposed on the end face of the aeration plate, and the flange portion of the contact piece points to the geometric center of the aeration plate.

[0010] Furthermore, several aeration heads are provided below the aeration frame. The aeration heads are connected to the output end of another blower and are used to increase the oxygen content and residence time in the aeration group.

[0011] Furthermore, the aeration head includes a tube seat detachably connected to the output end of the blower. A rotating head is movably connected to the end of the tube seat. Several hollow aeration balloons are evenly distributed on the rotating head. The interior of each aeration balloon is connected to the tube seat through a channel. Several openings are obliquely opened at the end of the rotating head. When oxygen passes through the tube seat, the rotating head is driven to rotate on the tube seat through the openings, and oxygen is sprayed out through the aeration balloons.

[0012] A method for renovating a wastewater treatment plant includes the following steps: Step 1, renovation preparation: collect wastewater discharge information to establish a renovation database. The wastewater discharge information includes: actual discharge volume, wastewater treatment capacity, wastewater treatment process, operating status, water quality, volume and location of each pool, and elevation of each pipe; Step 2, building construction: after Step 1, design construction drawings based on the wastewater discharge information and complete the building structure construction according to the construction drawings; Step 3, equipment installation: after Step 2, install and debug the equipment according to the construction drawings; Step 4, pipeline connection: after Step 3, connect the pipeline network between the renovated structure and the existing structure according to the construction drawings; Step 5, pool renovation: after Step 4, discharge wastewater into the renovated structure; Step 6, partition installation: after Step 5, groove the top of the wastewater pool in the existing structure and install a partition structure inside the wastewater pool; Step 7, power supply renovation: after Step 6, renovate the power supply system of the wastewater treatment plant; Step 8, commissioning and operation: after Step 7, complete the commissioning of the wastewater treatment plant equipment.

[0013] Step 1 also includes: Step 11, determining the capacity scale of the wastewater treatment plant after renovation based on the actual discharge volume; Step 12, determining the treatment process after renovation based on the wastewater treatment capacity and wastewater treatment process; Step 13, determining the number of equipment and installation requirements after renovation based on the operating conditions and water quality; Step 14, completing the construction drawing design based on the volume and location of each pool and the elevation of each pipeline.

[0014] Step 4 also includes: Step 41, determining the connection location and elevation in advance according to the construction drawings, and preparing the construction materials and personnel; Step 42, after lowering the water level at the connection location, opening holes in the pool wall or cutting off the pipes at the connection location to complete the installation and connection of the new pipes.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This invention adds an anoxic tank between the equalization tank and the sedimentation tank, connecting it to a contact oxidation tank. The contact oxidation tank is equipped with contact frames and aeration frames, with aeration groups arranged on the aeration frames. Each aeration group includes paired aeration plates. The anoxic tank helps promote the growth of microorganisms through an anaerobic environment, enabling them to effectively decompose organic matter in wastewater. The aeration groups in the contact oxidation tank supply oxygen via blowers, and the design of the aeration plates ensures uniform oxygen distribution, increasing dissolved oxygen in the wastewater and promoting the activity of aerobic microorganisms, thereby accelerating the decomposition of organic matter. This structure not only improves the efficiency of wastewater treatment but also enhances the degradation capacity of pollutants in wastewater by adding aeration groups, achieving a deeper level of purification. 2. The design of the contact plate and the opening of the through hole in this invention change the fluid flow pattern. Without the contact plate and through hole, the fluid flow is relatively uniform but the efficiency is low. The design of the contact plate and through hole causes the fluid to generate eddies and turbulence when passing through the aeration plate. Turbulence can promote the mixing between oxygen and sewage and increase the oxygen transfer rate. The oxygen dissolution process is affected by fluid dynamics conditions. Turbulence can increase the contact frequency between oxygen and sewage, thereby increasing the oxygen dissolution rate. The design of the contact plate and through hole makes the contact between oxygen and sewage more frequent when passing through the aeration plate. 3. The design of the aeration head in this invention achieves dynamic distribution of oxygen in wastewater through the rotation of the head. This dynamic distribution helps to break the surface tension of the water, making it easier for oxygen to dissolve into the wastewater and improving the oxygen transfer efficiency. In addition, the setting of the aeration head also helps to improve the uniformity of wastewater treatment and avoid local hypoxia or oxygen supersaturation. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall system structure of the present invention; Figure 2 This is a schematic diagram of the sedimentation tank and equalization tank of the present invention; Figure 3 This is a schematic diagram of the internal structure of the contact oxidation tank of the present invention; Figure 4 This is a schematic diagram of the aeration group of the present invention; Figure 5 This is a schematic diagram of the structure of the aeration head of the present invention.

[0017] The reference numerals in the attached figures represent: 1-Sewage tank, 2-Grit tank, 3-Equalization tank, 4-Sedimentation tank, 5-Disinfection tank, 6-Anoxic tank, 7-Contact oxidation tank, 8-Emergency accident tank, 9-Aeration head, 10-Central cylinder; 71-Contact frame, 72-Aeration frame, 73-Blower, 74-Aeration group, 75-Aeration plate; 751 - Aeration plate body, 752 - Contact area, 753 - Contact piece; 91-Tube seat, 92-Rotator, 93-Bubble balloon, 94-Opening. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. It should be noted that this invention is already in the actual research and development stage.

[0019] Example 1: Please refer to the attached document as well. Figures 1 to 5 A wastewater treatment plant includes a wastewater tank 1, a bar screen tank 2, an equalization tank 3, a sedimentation tank 4, and a disinfection tank 5, which are connected sequentially by pipelines. It also includes an anoxic tank 6, which is connected by pipelines between the equalization tank 3 and the sedimentation tank 4. The anoxic tank 6 is further connected by pipelines to a contact oxidation tank 7. The contact oxidation tank 7 includes a contact frame 71, an aeration frame 72 is disposed below the contact frame 71, a blower 73 is connected to the aeration frame 72, and aeration groups 74 are disposed on the aeration frame 72. Each aeration group 74 includes a pair of aeration plates 75, and each aeration plate 75 is connected to the aeration frame 72.

[0020] It should be noted that existing hospital wastewater treatment plants, due to their early construction, suffer from problems such as simple processes, aging equipment, outdated facilities, and unreasonable selection of operating parameter standards. They also fail to meet the ever-increasing wastewater treatment volume and stricter environmental emission standards. In existing technologies, hospital wastewater treatment plants often employ traditional treatment processes, including a wastewater tank 1, a screen tank 2, an equalization tank 3, a sedimentation tank 4, and a disinfection tank 5. While these processes generally meet the needs of wastewater treatment, they are no longer sufficient to meet the new treatment requirements as hospitals expand and environmental regulations become more stringent. The wastewater treatment plant solution in this embodiment adds an anoxic tank 6 between the equalization tank 3 and the sedimentation tank 4, connecting it to a contact oxidation tank 7. The contact oxidation tank 7 is equipped with a contact frame 71 and an aeration frame 72. Aeration groups 74 are arranged on the aeration frame 72, each aeration group 74 including paired aeration plates 75. The anoxic tank 6 helps promote the growth of microorganisms through an anaerobic environment, enabling the microorganisms to effectively decompose organic matter in the wastewater.

[0021] The aeration group 74 in the contact oxidation tank 7 supplies oxygen via blower 73. The design of the aeration plates 75 ensures uniform oxygen distribution, increasing dissolved oxygen in the wastewater, promoting the activity of aerobic microorganisms, and thus accelerating the decomposition of organic matter. This structure not only improves wastewater treatment efficiency but also enhances the degradation capacity of pollutants in the wastewater by adding aeration group 74, achieving a deeper level of purification. It significantly improves the treatment capacity of the wastewater treatment plant, ensuring stable and compliant discharge even with increased hospital wastewater volume. Simultaneously, it reduces operational risks associated with equipment aging and outdated facilities, improves the stability and reliability of wastewater treatment, meets environmental policy requirements, and plays a positive role in environmental protection.

[0022] It should be noted that the aeration plate 75 includes an aeration plate body 751 and four contact areas 752 disposed on the end face of the aeration plate body 751. The contact areas 752 of each pair of aeration plates 75 are arranged opposite to each other. Each contact area 752 includes several contact pieces 753, all of which are connected to the interior of the aeration plate body 751. Several through holes are also provided on each contact piece 753. It should also be noted that existing aeration plates 75 in wastewater treatment plants suffer from problems such as simple design, low aeration efficiency, and uneven aeration leading to unsatisfactory wastewater treatment results. In traditional wastewater treatment plants, the design of the aeration plate 75 is often relatively simple, failing to achieve efficient oxygen exchange and distribution. This limits the efficiency of wastewater treatment, especially under high load conditions. Uneven aeration can cause reduced activity of microorganisms in some areas due to oxygen deficiency, affecting the overall wastewater treatment process.

[0023] The aeration plate 75 includes an aeration plate body 751 and four contact areas 752 disposed on the end face of the plate body, with the contact areas 752 of each pair of aeration plates 75 arranged opposite to each other. Each contact area 752 contains several contact pieces 753, which communicate with the interior of the aeration plate body 751 and have several through holes. This structural design allows the aeration plate 75 to form multiple oxygen exchange points during aeration, increasing the surface area of ​​oxygen in contact with wastewater and improving oxygen transfer efficiency. When the blower 73 supplies air to the aeration group 74 through the aeration frame 72, oxygen is evenly distributed into the wastewater through the through holes on the contact pieces 753, achieving more efficient oxygen exchange and a more uniform aeration effect, thereby promoting biological activity and improving wastewater treatment efficiency.

[0024] It should also be noted that the placement of the contact plate 753 and the opening of the through-holes alter the fluid flow pattern. Without the contact plate 753 and through-holes, the fluid flow is relatively uniform but inefficient. The design of the contact plate 753 and through-holes generates eddies and turbulence as the fluid passes through the aeration plate 75. Turbulence promotes the mixing of oxygen and wastewater, increasing the oxygen transfer rate. The oxygen dissolution process is influenced by fluid dynamics; turbulence increases the contact frequency between oxygen and wastewater, thereby increasing the oxygen dissolution rate. The design of the contact plate 753 and through-holes ensures more frequent contact between oxygen and wastewater as it passes through the aeration plate 75, increasing the likelihood of oxygen dissolution. In traditional aeration systems, there are stagnant water zones where fluid flow is slow and oxygen transfer efficiency is low. The design of the aeration plate 75, by adding the contact plate 753 and through-holes, makes the fluid flow more uniform, reduces the formation of stagnant water zones, and thus improves the overall oxygen transfer efficiency of the system.

[0025] In this embodiment, it is preferable that the equalization tank 3 is connected to an emergency accident tank 8 via a pipeline. Under normal operating conditions, wastewater enters the subsequent treatment process after being treated by the screen tank 2 and equalization tank 3. In the event of an emergency, such as a wastewater leak or a sudden increase in pollution load, the emergency accident tank 8 can serve as a temporary storage facility to receive excess or contaminated wastewater. The above design allows operators sufficient time to adjust the treatment process or take other emergency measures, such as adding treatment agents, adjusting process parameters, or performing equipment maintenance, without directly affecting the operation of the entire wastewater treatment plant. The setting of the emergency accident tank 8 effectively adds a buffer link to the wastewater treatment process. This link can protect the entire system from damage in emergencies, ensuring the continuity and safety of wastewater treatment.

[0026] In this embodiment, it is preferable that a central cylinder 10 is provided inside the sedimentation tank 4. The central cylinder 10, as a flow guiding device, can alter the water flow dynamics within the sedimentation tank 4, causing the water to form a swirling or circulating flow, increasing the contact opportunity between suspended particles and the bottom of the sedimentation tank 4, thereby improving sedimentation efficiency. The design of the central cylinder 10 also promotes concentrated sedimentation of sludge, reducing sludge dispersion and floating within the tank, making sludge easier to collect and discharge. During the sedimentation process, the central cylinder 10 guides the water flow spirally down the cylinder wall to the bottom of the tank, increasing the distance and time for suspended particles to settle, giving particles more opportunities to settle to the bottom of the tank by gravity, while also reducing the disturbance of the settled sludge by the water flow, thus preventing sludge resuspension.

[0027] In this embodiment, it is preferred that the contact piece 753 is bent and disposed on the end face of the aeration plate 751, and the flange portion of the contact piece 753 all points to the geometric center of the aeration plate 751. The aeration plate 75 includes the aeration plate 751 and four contact areas 752 disposed on the end face of the aeration plate 751, with each pair of aeration plate 75's contact areas 752 arranged opposite to each other. Each contact area 752 includes a plurality of contact pieces 753, all of which communicate with the interior of the aeration plate 751. The contact pieces 753 also have a plurality of through holes. The contact pieces 753 are bent and disposed on the end face of the aeration plate 751, and the flange portion of the contact piece 753 all points to the geometric center of the aeration plate 751. This design allows the aeration plate 75 to form multiple oxygen exchange points during aeration, increasing the surface area of ​​oxygen contacting wastewater and improving oxygen transfer efficiency. When the blower 73 supplies air to the aeration group 74 through the aeration frame 72, the oxygen is evenly distributed into the sewage through the through holes on the contact plate 753, achieving more efficient oxygen exchange and more uniform aeration effect, thereby promoting the activity of microorganisms and improving the efficiency of sewage treatment.

[0028] It should be noted that several aeration heads 9 are also provided below the aeration frame 72. These aeration heads 9 are connected to the output end of another blower 73. The aeration heads 9 are used to increase the oxygen content and residence time in the aeration group 74. In traditional wastewater treatment processes, aeration systems often only provide basic oxygen supply, which is insufficient to meet the oxygen requirements of wastewater treatment under high load or special conditions. Especially during peak hours or when treating high-concentration organic wastewater, insufficient oxygen supply will limit the activity of microorganisms and affect the wastewater treatment effect. The aeration heads 9 are connected to the output end of another blower 73 to increase the oxygen content and residence time in the aeration group 74. The design of the aeration head 9 includes a pipe seat 91 detachably connected to the output end of the blower 73. A rotating head 92 is movably connected to the end of the pipe seat 91. Several hollow aeration balloons 93 are evenly distributed on the rotating head 92. The interior of each aeration balloon 93 is connected to the pipe seat 91 through a channel, and several openings 94 are obliquely opened at the end of the rotating head 92. When oxygen passes through the tube seat 91, the rotating head 92 rotates on the tube seat 91 via the opening 94, simultaneously causing the oxygen to be ejected through the aeration bulb 93. This structural design not only increases the oxygen supply but also achieves dynamic distribution of oxygen in the wastewater through the rotation of the rotating head 92, improving oxygen transfer efficiency and uniformity. The design of the aeration head 9 achieves dynamic distribution of oxygen in the wastewater through the rotation of the rotating head 92. This dynamic distribution helps to break the surface tension of the water, making it easier for oxygen to dissolve into the wastewater and improving oxygen transfer efficiency. In addition, the placement of the aeration head 9 also helps to improve the uniformity of wastewater treatment, avoiding localized hypoxia or oxygen supersaturation.

[0029] It should be noted that the aeration head 9 includes a pipe seat 91 detachably connected to the output end of the blower 73. A rotating head 92 is movably connected to the end of the pipe seat 91. Several hollow aeration balloons 93 are evenly distributed on the rotating head 92. The interior of each aeration balloon 93 communicates with the pipe seat 91 through a channel. The end of the rotating head 92 has several openings 94 at an angle. When oxygen passes through the pipe seat 91, the openings 94 drive the rotating head 92 to rotate on the pipe seat 91, simultaneously causing oxygen to be ejected through the aeration balloons 93. This design utilizes the rotational motion of the rotating head 92 to increase the contact time and contact area between oxygen and wastewater, thereby improving the oxygen dissolution efficiency. The rotation of the 92-degree rotor creates a dynamic airflow when oxygen is ejected. This dynamic airflow can more effectively disperse oxygen into the wastewater, increasing the contact opportunities between oxygen and wastewater, thereby improving the solubility and residence time of oxygen.

[0030] Example 2: This embodiment only describes the parts that differ from Embodiment 1. Specifically, a method for renovating a sewage treatment plant includes the following steps: Step 1, Renovation preparation: Collect sewage discharge information to establish a renovation database. The sewage discharge information includes: actual discharge volume, sewage treatment capacity, sewage treatment process, operating status, water quality, volume and location of each pool, and elevation of each pipe; Step 2, Building construction: After Step 1 is completed, design construction drawings based on the sewage discharge information and complete the building structure construction according to the construction drawings; Step 3, Equipment installation: After Step 2 is completed, install and debug the equipment according to the construction drawings; Step 4, Pipeline connection: After Step 3 is completed, connect the pipeline network between the renovated structure and the existing structure according to the construction drawings; Step 5, Pool renovation: After Step 4 is completed, discharge sewage into the renovated structure; Step 6, Partition installation: After Step 5 is completed, groove the top of the sewage pool 1 of the existing structure and install a partition structure inside the sewage pool 1; Step 7, Power supply renovation: After Step 6 is completed, renovate the power supply system of the sewage treatment plant; Step 8, Commissioning and operation: After Step 7 is completed, commission the sewage treatment plant equipment.

[0031] Step 1 also includes: Step 11, determining the capacity scale of the wastewater treatment plant after renovation based on the actual discharge volume; Step 12, determining the treatment process after renovation based on the wastewater treatment capacity and wastewater treatment process; Step 13, determining the number of equipment and installation requirements after renovation based on the operating conditions and water quality; Step 14, completing the construction drawing design based on the volume and location of each pool and the elevation of each pipeline.

[0032] Step 4 also includes: Step 41, determining the connection location and elevation in advance according to the construction drawings, and preparing the construction materials and personnel; Step 42, after lowering the water level at the connection location, opening a hole 94 in the pool wall at the connection location or cutting off the pipe to complete the installation and connection of the new pipe.

[0033] It should be noted that during the upgrading and renovation of hospital wastewater treatment plants, it is difficult to achieve the upgrade and renovation without suspending the operation of the wastewater treatment plant to meet the increased wastewater treatment volume and stricter environmental emission standards. In existing technologies, the upgrading and renovation of wastewater treatment plants often requires service interruption, which leads to environmental pollution and operational disruption, causing economic losses and social impact. In this embodiment, firstly, wastewater discharge information is collected to establish a renovation database, including actual discharge volume, treatment capacity, process, operating status, and water quality. Then, construction drawings are designed based on this information, and the building structure is constructed. Next, equipment is installed and single-unit commissioning is performed, the pipeline connection between the renovated structure and the existing structure is completed, wastewater is discharged into the renovated structure, and a partition structure is installed in wastewater tank 1. Finally, the power supply system is modified, and equipment commissioning is completed. This process ensures that the wastewater treatment plant can continue to operate during the renovation process, avoiding service interruption. Through the above method, the wastewater treatment plant can be upgraded and renovated without interrupting service, ensuring the continuity and stability of wastewater treatment. At the same time, the renovated wastewater treatment plant can treat more wastewater, and the discharged water quality meets stricter environmental standards. This method also reduces environmental risks and economic losses during the renovation process, and improves the operational efficiency and reliability of wastewater treatment plants.

[0034] It should also be noted that in step 1, the upgrade and renovation plan optimization design is based on the current operation of the hospital's wastewater treatment plant. The main reference points include: the actual wastewater discharge volume, wastewater treatment capacity, wastewater treatment process, current operation of the wastewater treatment plant, water quality, the volume and location of existing pools, the elevation of all pipes and wells, and site conditions. This information is collected and analyzed to optimize the wastewater treatment plant renovation plan. The optimized design content is as follows: Step 11: Based on the actual sewage discharge and existing sewage treatment capacity, and in conjunction with the hospital's planning and construction, reasonably estimate the expansion of the hospital's sewage treatment scale and determine the capacity scale of the expanded sewage treatment plant.

[0035] Step 12: Select a suitable wastewater treatment process based on the existing wastewater treatment plant's technology, operation and maintenance status, and water quality. The selection of the wastewater treatment process should fully consider the reuse of existing facilities to reduce the amount of additional construction work.

[0036] Step 13: Based on the determined wastewater treatment process and capacity, determine the volume of each pool, the number of equipment in each process step, and the installation requirements.

[0037] Step 14: Based on the volume and location of the existing water tanks, the elevation of each pipe and well, and the site conditions, determine the connection locations, pipe elevations, and equipment installation locations for each pipe to be modified, and complete the construction drawing design.

[0038] Step 2: Construction of new facilities and structures. Complete the construction of the new structures according to the construction drawings, including but not limited to the construction of new water tanks, new flow channels, station buildings, and other structures and buildings outside the existing sewage treatment plant. At the same time, complete the excavation of various pipe trenches and the laying of pipe networks outside the existing sewage treatment plant, only reserving interface positions for later connection.

[0039] Step 3: Equipment Installation within New Structures. This involves the installation and individual commissioning of various facilities and equipment, such as pipes, pumps, sewage treatment equipment, and control equipment, within the new structures.

[0040] Step 4: Connecting the new structure to the existing sewage treatment plant's pipeline network. Connecting the new structure to the existing sewage treatment plant requires creating openings in the side wall of the existing water tank or adding branch pipes to the existing pipelines to ensure smooth water flow and reduce the need for booster pumps. The connection steps are as follows: Step 41: Connection Preparation. Determine the connection location and elevation in advance according to the drawings. Complete the excavation, layout and positioning work on the outside of the water tank where the pipeline needs to be connected to the side wall of the water tank. Prepare all construction materials and personnel in place.

[0041] Step 42: Lower the water level at the connection point. To prevent sewage overflow during connection, the water level in the corresponding pipe or tank must be lowered below the elevation of the connection point. Select a time when the sewage treatment plant has a lower load (e.g., late at night) to measure the water level. If the low water level lasts long enough for connection construction, then select the corresponding time period to complete the connection construction at that location. If the water level is not low enough or the low water level period is too short to meet the connection construction requirements, additional measures must be taken to lower the water level. This can include closing the inlet valve at that location and temporarily storing the sewage in an emergency tank to lower the water level. Pipeline connection construction. After the water level at the connection point has lowered, make a 94mm opening in the tank wall at the connection point or cut the pipe to complete the installation and connection of the new pipe. Then, seal and waterproof the 94mm opening or the cut location.

[0042] Step 5: Renovation of the original sewage treatment plant's water tank. After the pipeline connection is completed, the original sewage treatment plant will be renovated. During the equipment installation and commissioning process, sewage can be temporarily stored in the newly built water tank, and the original water tank can be emptied to avoid adverse effects of sewage treatment on the renovation construction.

[0043] Step 6: Installation of the prefabricated partition for disinfection tank 5. Upgrading requires increasing the volume of disinfection tank 5, and adding a partition within it to ensure thorough mixing of the disinfectant and wastewater. If a new disinfection tank 5 is not constructed, an adjacent tank can be merged with it. A groove is cut into the top of the existing tank, and the prefabricated partition is lowered into the tank through the gap. The partition is prefabricated with pre-drilled drainage holes.

[0044] Step 7: Power Supply System Upgrade. After the installation of facilities and equipment is completed, the power supply system will be upgraded according to the operation of the new sewage treatment plant. Simultaneously, the equipment will be combined according to its purpose and installation location, and the control logic will be adjusted to ensure that equipment with the same function or equipment serving as backups uses the same control system. Monitoring Equipment Relocation. Based on the functions of each water tank after the upgrade, the monitoring probes, sampling devices, etc., of the corresponding monitoring equipment will be relocated to new locations, and the monitoring equipment will be debugged.

[0045] Step 8: Comprehensive Commissioning and Acceptance. After all the renovation work is completed, the wastewater treatment plant will undergo comprehensive commissioning to ensure that all components are operating normally, achieving the designed functions, and meeting the treatment standards. Once this is done, relevant acceptance procedures can be carried out, and the plant can be officially put into use.

[0046] In the above steps, the wastewater treatment plant renovation plan is designed in conjunction with the actual site conditions of the hospital. This allows for a comprehensive consideration of the hospital's actual wastewater discharge and treatment processes, enabling a reasonable and site-specific design that selects the most suitable upgrade and renovation plan to achieve the lowest overall cost for renovation, operation, and maintenance. During construction, by lowering the water level at the connection points and installing prefabricated partitions outside the water tanks, all renovation work is completed outside the tanks. This eliminates the need for personnel to enter the original wastewater treatment plant's tanks, reducing wastewater pumping and dredging work, minimizing the investment in measures for working in confined spaces, significantly lowering construction costs, and ensuring greater construction safety.

[0047] In the above technical solution, when connecting the new structure to the existing sewage treatment plant via pipeline, the water level at the connection point is lowered by choosing a low-discharge period such as late at night or temporarily storing sewage in an emergency pool. Once the water level is below the construction connection elevation, the work of opening and cutting, connecting pipes, and sealing are carried out from the outside of the existing sewage treatment plant. Prefabricated partitions are manufactured in advance, and on-site installation is also done by trenching from the outside of the pool. Using these technical methods, the entire sewage treatment plant renovation construction is completed outside the existing pool, reducing work in enclosed spaces. Personnel do not need to enter the original sewage treatment plant pool, thus eliminating the need for pumping and dredging of the existing pool. The construction environment outside the pool is favorable, construction speed is fast, and the construction process is safer and more economical. At the same time, it significantly reduces the discharge of temporary sewage, sludge, and other pollutants, better meeting environmental standards.

[0048] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wastewater treatment plant, comprising a wastewater tank (1), a grit chamber (2), an equalization tank (3), a sedimentation tank (4), and a disinfection tank (5) connected sequentially by pipelines, characterized in that: It also includes an anoxic tank (6) set between the equalization tank (3) and the sedimentation tank (4) via a pipeline. The anoxic tank (6) is also connected to a contact oxidation tank (7) via a pipeline. The contact oxidation tank (7) includes a contact frame (71). An aeration frame (72) is set under the contact frame (71). A blower (73) is connected to the aeration frame (72). An aeration group (74) is set on the aeration frame (72). Each aeration group (74) includes a pair of aeration plates (75). Each aeration plate (75) is connected to the aeration frame (72). The aeration plate (75) includes an aeration plate body (751) and four contact areas (752) disposed on the end face of the aeration plate body (751). The contact areas (752) of each pair of aeration plates (75) are arranged opposite to each other. The contact area (752) includes a plurality of contact pieces (753). The plurality of contact pieces (753) are all connected to the interior of the aeration plate body (751). The contact pieces (753) are also provided with a plurality of through holes. The contact piece (753) is bent and disposed on the end face of the aeration plate (751), and the flange portion of the contact piece (753) all points to the geometric center of the aeration plate (751), so that the fluid generates eddies and turbulence when passing through the aeration plate (75). Several aeration heads (9) are also provided below the aeration frame (72). The aeration heads (9) are connected to the output end of another blower (73). The aeration heads (9) are used to increase the oxygen content and residence time in the aeration group (74). The aeration head (9) includes a pipe seat (91) detachably connected to the output end of the blower (73). A rotating head (92) is movably connected to the end of the pipe seat (91). Several hollow aeration balloons (93) are evenly distributed on the rotating head (92). The interior of the aeration balloons (93) is connected to the pipe seat (91) through a channel. Several openings (94) are obliquely opened at the end of the rotating head (92). When oxygen passes through the pipe seat (91), the rotating head (92) is driven to rotate on the pipe seat (91) through the openings (94), and oxygen is sprayed out through the aeration balloons (93) at the same time, so as to realize the dynamic distribution of oxygen in the sewage through the rotation of the rotating head (92).

2. A sewage treatment plant according to claim 1, characterized in that: The regulating tank (3) is connected to the emergency accident tank (8) via a pipeline.

3. A sewage treatment plant according to claim 1, characterized in that: The sedimentation tank (4) is equipped with a central cylinder (10).

4. A method for retrofitting a sewage treatment plant, characterized in that: A wastewater treatment plant based on any one of claims 1 to 3 Includes the following steps; Step 1, Preparation for Renovation: Collect wastewater discharge information and establish a renovation database. Wastewater discharge information includes: actual discharge volume, wastewater treatment capacity, wastewater treatment process, operating status, water quality, volume and location of each pool, and elevation of each pipe. Step 2, building construction: After Step 1 is completed, design construction drawings based on the sewage discharge information, and complete the building structure construction based on the construction drawings; Step 3, Equipment Installation: After completing Step 2, install and debug the equipment according to the construction drawings. Step 4, Pipeline Connection: After completing Step 3, connect the pipelines of the modified structure and the existing structure according to the construction drawings. Step 5: Water tank renovation. After step 4 is completed, the sewage will be discharged into the renovated structure. Step 6, partition installation: After step 5 is completed, a groove is cut into the top of the sewage tank (1) with the existing structure, and a partition structure is installed in the sewage tank (1); Step 7: Power supply modification. After step 6 is completed, the power supply system of the sewage treatment plant will be modified. Step 8: Debugging and Operation. After completing Step 7, the debugging of the sewage treatment plant equipment is complete.

5. The method for renovating a sewage treatment plant according to claim 4, characterized in that: Step 1 also includes: Step 11: Determine the capacity of the wastewater treatment plant after renovation based on the actual discharge volume; Step 12: Determine the modified treatment process based on the wastewater treatment capacity and wastewater treatment process; Step 13: Determine the quantity and installation requirements of the modified equipment based on the operating conditions and water quality. Step 14: Complete the construction drawing design based on the volume and location of each water tank and the elevation of each pipe.

6. The method for renovating a sewage treatment plant according to claim 4, characterized in that: Step 4 also includes: Step 41: Determine the connection location and elevation in advance according to the construction drawings, and prepare the construction materials and personnel in place; Step 42: After lowering the water level at the connection point, make an opening (94) in the pool wall at the connection point or cut off the pipe to complete the installation and connection of the new pipe.

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