Integrated structure for circular treatment of derusting wastewater in floating dock

Abstract

The utility model belongs to the technical field of ship and ocean engineering, and particularly relates to a derusting wastewater circulating treatment integrated structure in a floating dock, which comprises a dock wall, a safety deck, a top deck, a dock wall ballast tank, a wastewater collecting tank and a fresh water tank, the dock wall ballast tank is arranged in the lower area of the dock wall, the top deck is arranged in the upper area of the dock wall, and the safety deck is arranged in the area below the top deck; the rust removal wastewater circulating treatment integrated structure comprises a wastewater circulating system, and the wastewater circulating system is arranged on the dock wall. According to the utility model, the derusting wastewater circulating treatment system is arranged in the floating dock, so that the derusting wastewater circulating treatment efficiency is improved; the rust removal wastewater is recycled, so that the problem of sewage discharge is solved, and the water cost is saved; a wastewater circulating system is integrated in the floating dock, so that the construction cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of shipbuilding and marine engineering technology, and in particular relates to an integrated structure for the recycling and treatment of rust removal wastewater in a floating dock. Background Technology

[0002] Currently, traditional shipyards use sandblasting to remove rust from outer plates. This method generates a lot of dust and pollution, which can affect the physical and mental health of construction workers and the surrounding environment. Furthermore, the large amount of manpower and resources required for on-site cleanup after sandblasting increases the cost and time required for ship repairs.

[0003] Ultra-high pressure water rust removal is a cost-effective and efficient method for ship rust removal, meeting environmental protection requirements for coating processes. This method utilizes water pressure exceeding 2000 kg to effectively clean the hull plating and severely corroded areas, resulting in a cleaner and more environmentally friendly process. However, ultra-high pressure water rust removal also produces byproducts: the wastewater after spraying. This wastewater carries iron filings, dust, floating oil, marine carcasses and carcasses, and a certain level of salinity. Direct discharge of this wastewater would cause significant pollution to the aquatic environment, and given the large volume, its pollution potential is considerable. Therefore, the wastewater must be treated before being discharged into water bodies. With increasing environmental regulations, the discharge of such wastewater into rivers is strictly prohibited, as it pollutes the aquatic environment. Some companies typically clean and recycle wastewater on-site, treating it in the dock's sewage treatment system to meet municipal discharge requirements before connecting it to the municipal network, significantly increasing the environmental costs for operating companies.

[0004] Chinese invention patent (authorization announcement number: CN215633721U) discloses a sewage suction machine, including: a vacuum pump, an electrical control box, a sewage suction pump, a roller shutter door, a sewage inlet, a liquid level observation port, a universal brake wheel, a water filter screen, a discharge trough, a forklift trough, a primary filter cartridge, a secondary filter cartridge, a tertiary filter cartridge, a water flow hole, a guardrail, lifting lugs, a handle, an air extraction filter screen, and a ladder. Roller shutter doors or push-pull doors are provided on the front, rear, and sides. One end of the sewage inlet is connected to a recovery pipe, and the other end enters the primary chamber of the sewage suction machine. The chamber is provided with a liquid level observation port. Sewage that has undergone coarse filtration in the primary chamber is discharged after passing through the filter cartridge chamber.

[0005] However, the aforementioned devices cannot subsequently recycle wastewater. Modern shipbuilding and marine equipment manufacturing and repair face increasingly stringent energy conservation and environmental protection requirements, leading to growing environmental pressure. Upgrading related equipment and facilities and integrating modern environmental protection technologies differs significantly from traditional methods. Therefore, it is necessary to design an integrated structure for the recycling and treatment of rust removal wastewater within a floating dock. This integrated structure, employing rust removal wastewater recycling technology, treats the wastewater directly within the floating dock and recycles it, preventing direct discharge and environmental pollution, and saving on environmental costs. Utility Model Content

[0006] The purpose of this utility model is to provide an integrated structure for the recycling and treatment of rust removal wastewater in a floating dock, aiming to solve the technical problems of environmental pollution and high cost caused by the discharge of rust removal wastewater in the prior art.

[0007] To achieve the above objectives, this utility model provides an integrated structure for the recycling and treatment of rust removal wastewater in a floating dock, including a dock wall, a safety deck, a top deck, a dock wall ballast tank, a wastewater collection tank, and a freshwater tank; the dock wall ballast tank is located in the lower part of the dock wall, the top deck is located in the upper part of the dock wall, and the safety deck is located in the area below the top deck; the integrated structure for the recycling and treatment of rust removal wastewater includes a wastewater recycling system located in the dock wall.

[0008] Optionally, the wastewater recycling system includes a sludge dewatering device; the sludge dewatering device is located on the top deck.

[0009] Optionally, the wastewater recycling system also includes an integrated water purification device located on the safety deck.

[0010] Optionally, the wastewater recycling system further includes a filter device, which is provided on both the upper and lower layers of the safety deck.

[0011] Optionally, the wastewater recycling system further includes a contact oxidation tank located on the safety deck.

[0012] Optionally, the wastewater recycling system further includes an MBR membrane tank located on the safety deck.

[0013] Optionally, the wastewater recycling system further includes a reverse osmosis unit located on the safety deck.

[0014] Optionally, the wastewater recycling system also includes a sludge tank located on the safety deck.

[0015] The integrated structure for rust removal wastewater recycling in the floating dock provided in this embodiment of the utility model has at least one of the following technical effects:

[0016] The integrated structure for the recycling and treatment of rust removal wastewater in the floating dock described in this utility model has the following advantages: 1. The rust removal wastewater recycling and treatment system is arranged in the floating dock, which improves the efficiency of rust removal wastewater recycling and treatment; 2. The rust removal wastewater is recycled and reused, which solves the problem of sewage discharge and saves water costs; 3. The wastewater recycling system is integrated into the floating dock, which reduces construction costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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.

[0018] Figure 1 A schematic diagram of the integrated structure for rust removal wastewater recycling in a floating dock provided in this embodiment of the utility model;

[0019] Figure 2 Another structural schematic diagram of the integrated structure for rust removal wastewater recycling treatment in the floating dock provided in this embodiment of the utility model;

[0020] Figure 3 Upper plan view of the safety deck provided in this embodiment of the utility model;

[0021] Figure 4 A lower plan view of the safety deck provided for an embodiment of this utility model;

[0022] Figure 5 A diagram showing the sequence of devices in the wastewater circulation system 300 through which the rust removal wastewater flows, as provided in this embodiment of the utility model.

[0023] The following are the labeling elements in the figure:

[0024] Floating dock 100, dock wall 110, safety deck 120, top deck 130, dock wall ballast tank 140, wastewater collection tank 150, freshwater tank 200, wastewater circulation system 300, sludge dewatering device 310, integrated water purification device 320, reverse osmosis device 330, filter filtration device 340, sludge tank 350, contact oxidation tank 360, MBR membrane tank 370. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, 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.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 embodiment of the invention according to the specific circumstances.

[0029] In one embodiment of this utility model, such as Figures 1-5 As shown, an integrated structure for the recycling and treatment of rust removal wastewater within a floating dock 100 is provided. This integrated structure is used to treat and recycle rust removal wastewater within the floating dock 100, avoiding direct discharge of rust removal wastewater and environmental pollution, saving water costs, and solving the significant environmental problem of rust removal wastewater pollution within the floating dock 100.

[0030] In another embodiment of this utility model, such as Figures 1-4 As shown, the main structure of the floating dock 100 includes: dock wall 110, safety deck 120, top deck 130, dock wall ballast tank 140, wastewater collection tank 150, and freshwater tank 200. The integrated structure for the rust removal wastewater recycling and treatment within the floating dock includes a wastewater recycling system 300. The wastewater recycling system 300 is integrated with the floating dock 100 to avoid the need for separate arrangements and independent treatment of the rust removal wastewater. The wastewater recycling system 300 includes: a sludge dewatering device 310, an integrated water purification device 320, a reverse osmosis device 330, a filter device 340, a sludge tank 350, a contact oxidation tank 360, and an MBR membrane tank 370.

[0031] The wastewater recycling system 300 is located in the dock wall 110. A dock wall ballast tank 140 is designed and arranged in the lower area of ​​the dock wall 110. The dock wall ballast tank 140 has a structured design, utilizing part of the original freshwater tank 200 as a wastewater recycling tank. After treatment, the rust removal wastewater flows into the dock wall ballast tank 140 for recycling. Therefore, after treatment in the floating dock 100, the rust removal wastewater can directly enter the freshwater tank 200 and be directly recycled within the floating dock 100.

[0032] In another embodiment of this utility model, such as Figures 1-2 As shown, the upper part of the dock wall 110 of the floating dock 100 is provided with a top deck 130. The sludge dewatering device 310 is provided on the top deck 130 to facilitate the cleaning of the sludge being treated.

[0033] In another embodiment of this utility model, such as Figures 2-4 As shown, a safety deck 120 is located below the top deck 130 of the floating dock 100. A wastewater recycling system 300 is located in the area between the safety deck 120 and the top deck 130 of the dock wall 110. The total height H of the dock wall 110 is given by H, the height H1 of the safety deck 120 by H1, and the height H2 between the top deck 130 and the safety deck 120 by H2, where H = H1 + H2. The length L of the dock wall 110 is given by H1 = 5 meters, H2 = 7 meters, and L = 20 meters in this case. It should be understood that the wastewater recycling system 300 can also be designed with other suitable dimensions and located in other suitable areas. The width B and length L of the area where the wastewater recycling system 300 is located on the safety deck 120 are given by B = 4.5 meters and L = 20 meters in this case. It should be understood that the wastewater recycling system 300 can also be designed with other suitable dimensions and located in other suitable areas.

[0034] The integrated water purification unit 320 is mounted on the safety deck 120. The integrated water purification unit 320 includes a coagulation zone and a sedimentation zone. The coagulation zone is divided into a first coagulation zone and a second coagulation zone, both equipped with air agitation pipelines. A PAC dosing device pipeline enters the first coagulation zone, and a PAM dosing device pipeline enters the second coagulation zone. The sedimentation zone is equipped with inclined tube packing, dividing the sedimentation tank into a series of shallow sedimentation layers. Utilizing the laminar flow principle, this improves the treatment capacity of the sedimentation tank; the increased inclined tube packing shortens the particle settling distance, thereby shortening the sedimentation time; and the increased inclined tube packing increases the sedimentation area of ​​the sedimentation tank, thus improving treatment efficiency. The coagulated wastewater flows upwards through the inclined tube packing, where large particle clumps move and separate within the shallow sedimentation layers.

[0035] In another embodiment of this utility model, such as Figures 3-4As shown, both the upper and lower layers of the safety deck 120 area are equipped with filter devices 340. The filter device 340 includes a sand filter zone in the lower layer and a security filter in the upper layer. The sand filter zone is located below the integrated water purification unit 320. The security filter is located between the integrated water purification unit 320 and the sludge tank 350. The sand filter zone contains a quartz sand filter layer and a water distribution pipe. During use, scale inhibitor is added to the front end of the security filter via a scale inhibitor dosing device.

[0036] In another embodiment of this utility model, such as Figures 2-4 As shown, the contact oxidation tank 360 is located on the safety deck 120. Besides rust and paint powder, rust removal wastewater often contains microorganisms attached to the ship's hull, which are typically removed using biochemical methods. Biochemical methods utilize the biochemical action of microorganisms to treat wastewater. This project employs an aerobic biochemical method, utilizing active aerobic microorganisms to decompose organic matter in wastewater into carbon dioxide, ammonia, and water in the presence of sufficient dissolved oxygen. The contact oxidation tank 360 contains suspended mixed packing material. This mixed packing material is developed based on soft and semi-soft packing materials, combining the advantages of both. Its structure replaces the pressed plastic discs with double-ringed large plastic rings, pressing aldehyde-modified fibers or polyester filaments onto the rings to ensure even fiber distribution. The inner ring consists of snowflake-shaped plastic branches, which can both support biofilm and effectively cut air bubbles, improving oxygen transfer rate and utilization. This allows for sufficient exchange between water, air, and the biofilm, resulting in efficient treatment of organic matter in the water. The contact oxidation tank 360 is equipped with aeration pipes, and air is pumped into the contact oxidation tank 360 through a matching aeration blower.

[0037] In another embodiment of this utility model, such as Figures 1-4 As shown, the MBR membrane tank 370 is located on the safety deck 120. The MBR unit is installed inside the MBR membrane tank 370. The MBR membrane uses a flexible flat sheet membrane, which combines the advantages of traditional flat sheet membranes and hollow fiber membranes, representing a completely new series of membrane module products. Membrane bioreactor (MBR) is a novel water treatment technology that combines membrane separation units with biological treatment units. It replaces the secondary sedimentation tank with membrane modules, maintaining a high concentration of activated sludge in the bioreactor, reducing the footprint of wastewater treatment facilities, and reducing sludge volume by maintaining a low sludge load. MBR has the following main characteristics: high treatment efficiency and good effluent quality; compact equipment and small footprint; easy to automate and simple to operate and manage.

[0038] In another embodiment of this utility model, such as Figures 1-4As shown, the reverse osmosis unit 330 is mounted on the safety deck 120. The reverse osmosis unit 330 contains a reverse osmosis membrane treatment device. The principle of reverse osmosis technology is that, under pressure higher than the osmotic pressure of the solution, other substances cannot pass through a semi-permeable membrane, thus separating them from water. The reverse osmosis membrane has very small pore sizes, thus effectively removing dissolved salts, colloids, microorganisms, organic matter, etc., from the water. The reverse osmosis unit 330 also includes a citric acid dosing device to periodically chemically clean the reverse osmosis membrane to restore its efficiency.

[0039] In another embodiment of this utility model, such as Figures 1-4 As shown, sludge tank 350 is located on safety deck 120. Sludge tank 350 is used to collect sludge and other debris from the wastewater treatment process.

[0040] The working principle of this utility model's integrated structure for the recycling and treatment of rust removal wastewater in a floating dock is as follows:

[0041] like Figure 5 The sequence of devices flowing through the wastewater circulation system 300 during rust removal wastewater treatment is as follows:

[0042] Sludge dewatering device 310 → Integrated water purification device 320 → Filter device 340 (sand filtration zone) → Contact oxidation tank 360 → MBR membrane tank 370 → Filter device 340 (security filter) → Reverse osmosis device 330.

[0043] The processing flow in each device is as follows:

[0044] Sludge dewatering device 310: After the rust removal wastewater generated in the dock is collected at the bottom of the dock, it is pumped into the coarse filtration and sedimentation tank of the sludge dewatering device 310 on the floating dock 100 for pretreatment, and then pumped into the integrated water purification device 320 through the pump in the tank.

[0045] Integrated water purification unit 320: Rust removal wastewater is first mixed with added PAC and PAM agents in the coagulation zone. The mixed wastewater then flows into the sedimentation zone through bottom openings.

[0046] Filter device 340 (sand filter zone): There are still some small particulate suspended matter in the sewage treated by the integrated water purification device 320. As the sewage flows into the sand filter zone from the upper outlet weir in the sedimentation zone.

[0047] Contact oxidation tank 360: Sand filter effluent flows into contact oxidation tank 360 by gravity. Under the action of aeration and mixed packing, most of the organic matter and microorganisms in the wastewater are removed.

[0048] MBR Membrane Tank 370: Water treated in Contact Oxidation Tank 360 flows into MBR Membrane Tank 370 through a weir. After the wastewater undergoes biological and filtration processes within MBR Membrane Tank 370, the clean water is pumped out and pumped through pipelines into the next pre-filter filtration stage.

[0049] Filter unit 340 (security filter): It is equipped with a security filter. Wastewater that has been biochemically treated by the contact oxidation tank 360 and the MBR membrane tank 370 is first pumped into the security filter, where the rust removal wastewater removes extremely fine suspended solids.

[0050] Reverse osmosis unit 330: Water filtered by the security filter is pumped into the reverse osmosis membrane by a high-pressure pump. After being filtered by high pressure, the water is discharged into the clear water tank in the dock, waiting to be reused.

[0051] To facilitate hoisting, installation, and transportation, the wastewater recycling system 300 adopts a multi-stage box-type combined process. The process is divided into a primary treatment stage, a biological treatment stage, an advanced treatment stage, and a sludge treatment stage. Based on the wastewater properties and treatment targets of the project, the following wastewater treatment process flow was designed and implemented:

[0052] Wastewater → Pretreatment → Coagulation → Sedimentation → MBR aerobic tank (ultrafiltration) → Reverse osmosis → Ultraviolet disinfection → Effluent.

[0053] Process flow description:

[0054] The rust removal wastewater generated in the dock is collected at the bottom of the dock and then pumped into the coarse filtration and sedimentation tank on the floating dock 100 for pretreatment. It is then pumped into the primary treatment section through the tank.

[0055] The primary treatment uses a coagulation and sedimentation process. The wastewater is first mixed with added PAC and PAM agents in a coagulation reaction tank, which causes most of the free metal ions in the water to coagulate into large particle clusters, which are then removed by an inclined plate sedimentation tank.

[0056] The biological treatment adopts the MBR process. The wastewater after coagulation and sedimentation is pumped into the MBR aerobic tank for biological treatment. Through the dual action of membrane and biological reaction, biological pollutants such as BOD and COD in the water are removed.

[0057] The advanced treatment uses reverse osmosis technology, which can remove most of the metal ions and hardness from the water. The effluent is then disinfected with ultraviolet light and recycled.

[0058] The wastewater treatment capacity in this case is 30m³. 3 The processing station operates 24 hours a day, with a daily processing capacity of 720m³. 3After treatment, the wastewater is reused as makeup water for rust removal. Therefore, the effluent must meet the requirements for "process and product water" in GBT19923-2005 "Water Quality Standard for Industrial Water Used for Urban Wastewater Reuse" and also meet the influent water quality requirements for ultra-high pressure water units.

[0059] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated structure for the recycling and treatment of rust removal wastewater in a floating dock, characterized in that: The floating dock includes: dock wall, safety deck, top deck, dock wall ballast tank, wastewater collection tank and freshwater tank; the dock wall ballast tank is located in the lower part of the dock wall, the top deck is located in the upper part of the dock wall, and the safety deck is located in the area below the top deck; the integrated structure for rust removal wastewater recycling includes a wastewater recycling system, which is located on the dock wall.

2. The integrated structure for the recycling and treatment of rust removal wastewater in a floating dock as described in claim 1, characterized in that: The wastewater recycling system includes a sludge dewatering device; the sludge dewatering device is located on the top deck.

3. The integrated structure for rust removal wastewater recycling in a floating dock as described in claim 1, characterized in that: The wastewater recycling system also includes an integrated water purification device, which is located on the safety deck.

4. The integrated structure for the recycling and treatment of rust removal wastewater in a floating dock as described in claim 1, characterized in that: The wastewater recycling system also includes a filter device, which is installed on both the upper and lower layers of the safety deck.

5. The integrated structure for the recycling and treatment of rust removal wastewater in a floating dock as described in claim 1, characterized in that: The wastewater recycling system also includes a contact oxidation tank, which is located on the safety deck.

6. The integrated structure for rust removal wastewater recycling in a floating dock as described in claim 1, characterized in that: The wastewater recycling system also includes an MBR membrane tank, which is located on the safety deck.

7. The integrated structure for the recycling and treatment of rust removal wastewater in a floating dock as described in claim 1, characterized in that: The wastewater recycling system also includes a reverse osmosis unit, which is located on the safety deck.

8. The integrated structure for the recycling and treatment of rust removal wastewater in a floating dock according to any one of claims 5-7, characterized in that: The wastewater recycling system also includes a sludge tank, which is located on the safety deck.

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