Ship oily water treatment system

Abstract

The invention relates to the technical field of marine pollution discharge, and discloses a ship oily water treatment system. The system comprises a plurality of greasy dirt wells, an oily water cabin, an oily water treatment device and a control device, the greasy dirt water wells are respectively distributed in a plurality of areas of the ship; the oily water tank is connected with an oily water well; the oily water treatment device is connected with the oily water cabin and can operate under a first working condition and a second working condition; the control device is used for enabling the oily water treatment device to operate in a first working condition when the water body obtained by gravity coalescence separation meets a preset discharge condition, and enabling the oily water treatment device to operate in a second working condition when the water body obtained by gravity coalescence separation does not meet the preset discharge condition. According to the embodiment of the invention, the collection efficiency and treatment precision of the ship oily water can be improved.

Description

Technical Field

[0001] This application relates to the field of marine sewage treatment technology, and in particular to a marine oily wastewater treatment system. Background Technology

[0002] Ship oily wastewater refers to oily water and wastewater generated during the starting, navigation, and maintenance of ships. It originates from oily tank cleaning water, engine room water, and oily ballast water. This oily wastewater cannot be directly discharged, as this would lead to marine environmental pollution and, over time, threaten human life. However, current ship oily wastewater treatment methods are unable to meet the needs of decentralized drainage in multiple areas, and their treatment accuracy is easily affected by fluctuations in the oily wastewater level, resulting in low collection efficiency and low treatment precision. Summary of the Invention

[0003] The purpose of this application is to provide a ship oily wastewater treatment system that can cope with decentralized drainage in multiple areas and is not easily affected by fluctuations in the liquid level of oily wastewater, thereby improving the collection efficiency and treatment accuracy of ship oily wastewater.

[0004] This application provides a ship oily wastewater treatment system, including: Multiple oil and wastewater wells are located in various areas of the ship; Oily wastewater tank, connected to the oily wastewater well; An oily wastewater treatment device, connected to the oily wastewater tank, can operate in a first working condition and a second working condition; the first working condition is to perform gravity coalescence separation on the oily wastewater entering from the oily wastewater tank and discharge the water obtained by gravity coalescence separation; the second working condition is to perform gravity coalescence separation on the oily wastewater entering from the oily wastewater tank and perform membrane separation on the water obtained by gravity coalescence separation. A control device is configured to operate the oily wastewater treatment device in the first operating condition when the water obtained by gravity coalescence separation meets the preset discharge conditions, and to operate the oily wastewater treatment device in the second operating condition when the water obtained by gravity coalescence separation does not meet the preset discharge conditions.

[0005] In some embodiments, the control device is further configured to switch the oily wastewater treatment device to operate in the first operating condition when the oily wastewater treatment device is operating in the second operating condition and the water obtained by gravity coalescence separation is detected to meet the preset discharge conditions.

[0006] In some embodiments, the ship's oily wastewater treatment system further includes: Oily waste tank, connected to the oily wastewater treatment device; The control device is also used to, when the content of sludge in the oily wastewater treatment device meets the first transfer condition, cause the oily wastewater treatment device to operate in a third working condition; the third working condition is to connect to an external water body to backwash the sludge in the oily wastewater treatment device and discharge the sludge discharged from the backwash to the sludge tank.

[0007] In some embodiments, the control device is further configured to configure the operating cycle and / or operating duration of the oily wastewater treatment device in the third operating condition based on the oil content from the oil content of the oily wastewater treatment device.

[0008] In some embodiments, the control device is further configured to, when the content of oily wastewater in the oily wastewater well meets the second transfer condition, transfer the oily wastewater from the oily wastewater well to the oily wastewater tank, and when the content of oily wastewater in the oily wastewater tank meets the third transfer condition, transfer the oily wastewater from the oily wastewater tank to the oily wastewater treatment device.

[0009] In some embodiments, the control device is further configured to transfer oily wastewater from the oily wastewater well to the oily wastewater tank and to transfer oily wastewater from the oily wastewater tank to the outside of the vessel, so that the liquid levels of both the oily wastewater well and the oily wastewater tank are reduced to below their respective target liquid levels.

[0010] In some embodiments, the oily wastewater treatment apparatus includes: A gravity coalescing separator, connected to the oily wastewater tank, is used to perform gravity coalescing separation on the oily wastewater entering from the oily wastewater tank; A membrane separator, connected to the gravity coalescing separator, is used to perform membrane separation on the water obtained from the gravity coalescing separation when the water obtained from the gravity coalescing separation does not meet the preset discharge conditions.

[0011] In some embodiments, the control device is configured to, when the water obtained by gravity coalescence separation meets the preset discharge conditions, cause the gravity coalescence separator to discharge the water obtained by gravity coalescence separation, and conversely, cause the gravity coalescence separator to transfer the water obtained by gravity coalescence separation to the membrane separator, and when the water obtained by membrane separation meets the preset discharge conditions, cause the membrane separator to discharge the water obtained by membrane separation.

[0012] In some embodiments, the control device is configured to connect the outlet of the gravity coalescing separator to an external water body and connect the inlet of the gravity coalescing separator to the oily sludge tank when the oil content in the gravity coalescing separator meets the first transfer condition.

[0013] In some embodiments, the outlet of the gravity coalescing separator is connected in sequence to a drain pump and a discharge filter, and the drain pump pumps the water obtained by gravity coalescing to the discharge filter for discharge.

[0014] The beneficial effects of this application are as follows: An oily wastewater treatment device capable of real-time gravity coalescence separation and membrane separation is configured. Through a dual-condition adaptive switching mechanism, energy consumption is optimized while ensuring discharge compliance. When the oil content of the water obtained from gravity coalescence separation is low, only the gravity coalescence separator needs to be activated to complete the treatment. Conversely, when the oil content is high, both gravity coalescence separation and membrane separation are activated simultaneously to treat the oily wastewater. Compared to using a single treatment mode, this improves the treatment accuracy of ship oily wastewater. Furthermore, multiple oily wastewater wells arranged in different zones, in conjunction with a centralized oily wastewater tank, efficiently collect oily wastewater from various areas of the ship and effectively alleviate the liquid level fluctuation problem caused by simultaneous drainage from multiple areas, thereby improving the collection efficiency of ship oily wastewater. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the ship oily wastewater treatment system provided in the embodiments of this application.

[0016] Figure 2 This is a schematic diagram of the structure of the oily wastewater treatment device provided in the embodiments of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0018] It should be noted that the terms "first," "second," "third," "fourth," etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a system, product, or device that includes a series of circuits is not necessarily limited to those explicitly listed, but may include other circuits not explicitly listed or inherent to such systems, products, or devices.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0020] In one embodiment, see Figure 1 The ship's oily wastewater treatment system includes multiple oily wastewater wells 10, oily wastewater tanks 20, oily wastewater treatment devices 30, and control devices 40.

[0021] Each oily wastewater well 10 is located in multiple areas of the ship. Oily wastewater well 10 refers to a wastewater collection unit distributed in multiple areas of the ship, such as the engine room and cargo hold. Specifically, it can be implemented using a cubic container with a wave-damping baffle at the bottom, used for the separate collection of oily wastewater from different sources.

[0022] Oily wastewater tank 20 is connected to oily wastewater well 10. Oily wastewater tank 20 refers to a transitional container for centralized storage of oily wastewater. Specifically, it can be formed by welding corrosion-resistant steel plates. Its volume can be 1.2-1.5 times the total volume of each oily wastewater well 10, serving to buffer level fluctuations and centrally store the oily wastewater in each oily wastewater well 10.

[0023] The oily wastewater treatment device 30 is connected to the oily wastewater tank 20 and can operate in both a first and a second operating condition. The oily wastewater treatment device 30 is a device that achieves oil-water two-phase separation and precision membrane separation. Specifically, it can be constructed using a combination structure of a coalescing separator and a gravity settling tank, and equipped with ceramic membrane modules of appropriate pore sizes, for the fine separation of oily wastewater. The first operating condition involves gravity coalescing the oily wastewater entering from the oily wastewater tank 20 and discharging the resulting water. The second operating condition involves gravity coalescing the oily wastewater entering from the oily wastewater tank 20 and performing membrane separation on the resulting water. The first operating condition can be understood as the mode of directly discharging qualified water after gravity coalescing, which can be simplified by switching valves or pumping paths. The second operating condition refers to the state where the oily wastewater treatment device 30 further performs membrane separation after gravity coalescing of the oily wastewater, which can be achieved using microfiltration membrane modules or centrifugal separators, for treating water that does not meet discharge standards. When the oily wastewater treatment device 30 operates in the first working condition, it performs gravity coalescence separation on the oily wastewater entering from the oily wastewater tank 20 and discharges the water obtained from the gravity coalescence separation. Alternatively, when the oily wastewater treatment device 30 operates in the first working condition, it first performs gravity coalescence separation on the oily wastewater entering from the oily wastewater tank 20, then performs membrane separation on the water obtained from the gravity coalescence separation and discharges the water obtained from the membrane separation.

[0024] The control device 40 is used to operate the oily wastewater treatment device 30 in a first operating condition when the water obtained from gravity coalescence separation meets the preset discharge conditions, and to operate the oily wastewater treatment device 30 in a second operating condition when the water obtained from gravity coalescence separation does not meet the preset discharge conditions. The preset discharge conditions characterize the threshold standard of oil content in the water obtained from gravity coalescence separation, which can be specifically set to not exceed 15 ppm, and is monitored in real time by an online oil concentration detector. The control device 40 monitors in real time whether the water obtained from gravity coalescence separation meets the preset discharge conditions by acquiring sensor data of oil content in the water obtained from gravity coalescence separation. When the water obtained from gravity coalescence separation meets the preset discharge conditions, the oily wastewater treatment device 30 operates in the first operating condition and directly discharges the water obtained from gravity coalescence separation. When the water obtained from gravity coalescence separation does not meet the preset discharge conditions, the oily wastewater treatment device 30 operates in the second operating condition, and discharges the water obtained from gravity coalescence separation after membrane separation.

[0025] In practical applications, the oily wastewater well 10 collects oily wastewater generated in various areas of the ship and transfers it to the oily wastewater tank 20. When the amount of oily wastewater stored in the oily wastewater tank 20 reaches a certain level, the control device 40 activates the oily wastewater treatment device 30 to draw the oily wastewater from the oily wastewater tank 20 into the oily wastewater treatment device 30. The oily wastewater is then discharged after gravity coalescence separation, or after gravity coalescence separation and membrane separation. While the oily wastewater treatment device 30 is treating the incoming oily wastewater, the control device 40 monitors the oil content in the water obtained from gravity coalescence separation in real time through an online monitoring unit. When the water obtained from gravity coalescence separation meets the preset discharge conditions, the control device 40 maintains the operation of the oily wastewater treatment device 30 in the first operating condition. When the water obtained from gravity coalescence separation does not meet the preset discharge conditions, the control device 40 switches to the second operating condition. For example, if the oil content in the water obtained from gravity coalescence separation is consistently below 15 ppm as monitored in real time by the online monitoring unit, the control device 40 controls the oily wastewater treatment device 30 to maintain operation in the first working condition, allowing the water obtained from gravity coalescence separation to be directly discharged into the sea. When the sampled value exceeds the threshold (15 ppm), the control device 40 controls the oily wastewater treatment device 30 to switch to operation in the second working condition, where the water obtained from gravity coalescence separation undergoes membrane separation. Discharge is only permitted after the sampled value of the membrane-separated water meets the standards, ensuring that the discharged water always meets environmental protection requirements. Thus, through a dual-working-condition adaptive switching mechanism, energy consumption allocation is optimized while ensuring that discharge meets standards. For example, when the oil content in the wastewater is low, treatment can be completed by simply using the gravity coalescence separator 31, reducing energy consumption by approximately 40% compared to the existing solution of continuously operating the microfiltration equipment. Simultaneously, the zoned oily wastewater wells 10, in conjunction with the centralized oily wastewater tank 20, effectively alleviate the problem of liquid level fluctuations caused by simultaneous drainage from multiple areas.

[0026] In some embodiments, the control device 40 is further configured to switch the oily wastewater treatment device 30 to operate in the first operating condition when the oily wastewater treatment device 30 is operating in the second operating condition and the water obtained by gravity coalescence separation is detected to meet the preset discharge conditions.

[0027] When the oily wastewater treatment device 30 is in the second operating mode of membrane separation, the control device 40 continuously monitors the oil content of the water obtained by gravity coalescence separation. If the oil content is detected to drop to meet the preset discharge conditions, the control device 40 immediately triggers an operating mode switching command, causing the oily wastewater treatment device 30 to stop membrane separation of the water obtained by gravity coalescence separation and directly discharge the water obtained by gravity coalescence separation. Thus, the treatment process automatically returns to the first operating mode that only performs primary gravity coalescence separation, avoiding continuous operation of the high-energy-consuming microfiltration treatment stage. Through real-time detection and automatic switching mechanism, the operating mode can be switched as soon as the treated water quality meets the standards, eliminating ineffective treatment time.

[0028] In one embodiment, see Figure 1 The ship's oily wastewater treatment system also includes an oily waste tank 50.

[0029] The sludge tank 50 is connected to the oily wastewater treatment device 30. The sludge tank 50 is a container used to store sludge oil flushed from the oily wastewater treatment device 30, and can be made of corrosion-resistant materials such as stainless steel or polyethylene. The sludge tank 50 is connected to the oily wastewater treatment device 30 via pipes to receive residual sludge oil in the device.

[0030] The control device 40 is also used to operate the oily wastewater treatment device 30 in a third operating condition when the content of sludge in the oily wastewater treatment device 30 meets the first transfer condition. The third operating condition involves introducing external water to backwash the sludge in the oily wastewater treatment device 30 and discharging the backwashed sludge into the sludge tank 50. It can be understood that the third operating condition refers to the operation mode of backwashing the oily wastewater treatment device 30 by introducing an external water source (e.g., seawater). Specifically, this can be achieved by switching valves to control the water flow direction, allowing clean water to flow backward from the outlet into the device, and then pressurizing it with a water pump to form a reverse flow, flushing away oil particles adhering to the inner wall of the device. The first transfer condition refers to the accumulation of sludge inside the oily wastewater treatment device 30 reaching a preset threshold. This threshold can be monitored in real time by a level sensor or an oil concentration detection device, and is triggered when the sludge content exceeds the safe operating range.

[0031] When the amount of sludge accumulated inside the oily wastewater treatment device 30 meets the first transfer condition, the control device 40 puts the oily wastewater treatment device 30 into the third operating condition. At this time, external water is introduced into the oily wastewater treatment device 30 and flows in reverse, flushing away the sludge and transferring it outside the device to the sludge tank 50 for temporary storage. For example, when the level of sludge in the oily wastewater treatment device 30 reaches a preset threshold level, the control device 40 triggers a backwashing procedure, introducing external water into the wastewater treatment device to backwash its interior. The backwashing time can be set to 10-15 minutes. The sludge formed during the backwashing process is transported to the sludge tank 50 through a dedicated pipeline, preventing direct discharge and environmental pollution. Thus, by adding the sludge tank 50, the temporary storage of sludge is separated from the main treatment process. Simultaneously, the automatic detection and triggering mechanism is more timely and accurate than manual judgment, effectively preventing equipment blockage caused by excessive sludge accumulation.

[0032] In some embodiments, the control device 40 is further configured to configure the operating cycle and / or operating duration of the oily wastewater treatment device 30 in the third operating condition according to the oil content of the oily wastewater treatment device 30.

[0033] The operating cycle refers to the time interval between two consecutive initiations of the third operating condition, which can be implemented using a timer or counter to control the triggering frequency of the backwashing operation. The running duration refers to the duration of a single third operating condition, which can be implemented by setting a time threshold or a liquid level sensor signal to adjust the duration of the backwashing operation.

[0034] The control device 40 acquires the oil content of the oily wastewater treatment device 30 in real time via sensors. If the detected oil content is high, the operating cycle of the third operating mode is shortened and / or the operating time of the third operating mode is extended to increase the backwashing frequency and / or extend the backwashing time, thereby preventing the accumulation of oily waste in the gravity coalescence separator 31. If the oil content is low, the operating cycle of the third operating mode is extended and / or the operating time of the third operating mode is shortened to reduce the number of backwashings and reduce energy consumption. For example, when the oil content exceeds a preset threshold, the control device 40 adjusts the operating cycle of the third operating mode to once every 30 minutes, with each run lasting 10 minutes; when the oil content is below the threshold, the control device 40 adjusts the operating cycle of the third operating mode to once every 2 hours, with each run lasting 5 minutes. Thus, by monitoring the oil content in real time and dynamically matching the operating parameters, both ineffective operations are avoided and treatment efficiency is ensured.

[0035] In some embodiments, the control device 40 is further configured to, when the content of oily wastewater in the oily wastewater well 10 meets the second transfer condition, transfer the oily wastewater from the oily wastewater well 10 to the oily wastewater tank 20, and when the content of oily wastewater in the oily wastewater tank 20 meets the third transfer condition, transfer the oily wastewater from the oily wastewater tank 20 to the oily wastewater treatment device 30.

[0036] The second transfer condition refers to the liquid level or volume in the oily wastewater well 10 reaching a preset threshold. Specifically, a level sensor or flow meter can be used to monitor the storage volume in the well. When the detected liquid level exceeds the set height, the transfer action is triggered. This second transfer condition is used to prevent the risk of overflow due to insufficient capacity in the oily wastewater well 10. The third transfer condition refers to the storage volume in the oily wastewater tank 20 reaching the range suitable for the single-processing capacity of the oily wastewater treatment device 30. Specifically, a pressure sensor or level gauge can be used to monitor the amount of oily wastewater in the tank. When the detected storage volume in the oily wastewater tank 20 reaches the preset upper limit, the processing process is initiated. This third transfer condition is used to ensure that the amount of oily wastewater transported from the oily wastewater tank 20 to the oily wastewater treatment device 30 matches its treatment efficiency.

[0037] When oily wastewater wells 10 are distributed in different areas of the ship, the accumulation rate of oily wastewater in each well 10 may differ. When the liquid level of a certain oily wastewater well 10 reaches the second transfer condition, the control device 40 automatically starts the transfer pump connected to that well 10, causing the well 10 to transport the oily wastewater to the centralized storage tank 20. The tank 20, as an intermediate buffer unit, continuously receives oily wastewater from multiple wells 10 and monitors the storage status in real time through in-tank sensors. When the amount of oily wastewater in the tank accumulates to the threshold corresponding to the third transfer condition, the control device 40 activates the delivery pipeline connecting the tank 20 and the oily wastewater treatment device 30, causing the tank 20 to input the oily wastewater into the oily wastewater treatment device 30 in batches for separation. Therefore, by setting the second and third transfer conditions in stages, local overflow of oily wastewater well 10 is avoided, and the amount of oily wastewater transported from oily wastewater tank 20 to oily wastewater treatment device 30 is dynamically matched with its treatment capacity, thereby reducing equipment load fluctuations and improving treatment continuity, and realizing hierarchical transfer control from decentralized collection to centralized treatment.

[0038] In some embodiments, the control device 40 is further configured to transfer oily wastewater from the oily wastewater well 10 to the oily wastewater tank 20 and to transfer oily wastewater from the oily wastewater tank 20 to the outside of the ship, so that the liquid levels of both the oily wastewater well 10 and the oily wastewater tank 20 are reduced to below the corresponding target liquid levels.

[0039] When the ship is docked at the pier, the ship's oily wastewater treatment system operates in pier mode. In pier mode, the control device 40 activates the primary transfer pump to transfer wastewater from the oily wastewater well 10 to the oily wastewater tank 20, and further activates the secondary transfer pump to discharge wastewater from the oily wastewater tank 20 to the ship. During this process, level sensors continuously provide real-time data until the levels in both the oily wastewater well 10 and the oily wastewater tank 20 drop below their respective target levels. The control device 40 dynamically adjusts the pump operation based on the feedback to ensure that the levels are always maintained below the target levels. For example, the target level for the oily wastewater well 10 can be set to 3% of its capacity, and the target level for the oily wastewater tank 20 can be set to 2% of its capacity. This tiered control enables the orderly collection and centralized discharge of wastewater from multiple areas. Thus, by using staged level control and automated transfer when the ship is docked at the pier, efficient collection and stable discharge of wastewater from multiple areas are achieved, reducing the load on the oily wastewater treatment device 30.

[0040] In one embodiment, in conjunction with reference Figure 1 and Figure 2 The oily wastewater treatment device 30 includes a gravity coalescing separator 31 and a membrane separator 32.

[0041] Gravity coalescing separator 31 is connected to oily wastewater tank 20. Gravity coalescing separator 31 is used to separate oily wastewater entering from oily wastewater by gravity coalescing. Gravity coalescing separator 31 refers to a device that separates the oil phase from the water phase in oily wastewater through gravity sedimentation, centrifugal separation, or coalescing separation. Specifically, it can be implemented using a separation chamber with inclined plate assemblies, promoting oil-water stratification by extending the residence time of the oily wastewater. This device is used to initially reduce the oil content of the water to meet basic discharge requirements.

[0042] Membrane separator 32 is connected to gravity coalescing separator 31. Membrane separator 32 is used to perform membrane separation on the water obtained from gravity coalescing when the water does not meet the preset discharge conditions. Membrane separator 32 refers to a device that performs secondary treatment of water using physical filtration methods. Specifically, it can be implemented using a microporous filter membrane or ceramic filter element structure, which improves water quality by intercepting tiny oil droplets and suspended solids. This device is used to further purify the water when the water quality after gravity coalescing does not meet the standards, ensuring that the discharge meets environmental protection standards.

[0043] In practical applications, the oily wastewater in the oily wastewater tank 20 is transported to the gravity coalescing separator 31 for primary treatment. If the oil content of the water obtained from gravity coalescing is below a preset threshold, it is directly discharged. If the oil content exceeds the threshold, the water obtained from gravity coalescing is transferred to the membrane separator 32 for secondary filtration via pipeline. The membrane separator 32 uses a filter medium to trap residual oil droplets and particulate matter. The water obtained from membrane separation is discharged after passing a test. For example, the gravity coalescing separator 31 can be equipped with an oil content sensor. When the oil content in the water exceeds 15 ppm, the membrane separator 32 is automatically triggered to start. Thus, by adding the membrane separator 32, a two-stage treatment process is formed, supplementing purification when the primary separation is incomplete, enhancing the system's adaptability to complex operating conditions. In addition, the membrane separator 32 uses a physical filtration method, which has the advantages of simple maintenance and low operating costs compared to chemical treatment or complex membrane separation technologies.

[0044] In some embodiments, the control device 40 is configured to, when the water obtained by gravity coalescence separation meets the preset discharge conditions, cause the gravity coalescence separator 31 to discharge the water obtained by gravity coalescence separation, and conversely, cause the gravity coalescence separator 31 to transfer the water obtained by gravity coalescence separation to the membrane separator 32, and cause the membrane separator 32 to discharge the water obtained by membrane separation when the water obtained by membrane separation meets the preset discharge conditions.

[0045] When the water obtained from gravity coalescence separation meets the discharge standards, the control device 40 immediately initiates the discharge process, directly discharging the water from the system via negative pressure suction. If the detection shows that the water obtained from gravity coalescence separation does not meet the standards, the control device 40 will automatically switch the pipeline valves to introduce the substandard water into the membrane separator 32 for secondary treatment. The water obtained from membrane separation is then subjected to online monitoring again, and if it meets the standards, it is finally discharged through the discharge pump set. The entire process achieves dynamic switching of the treatment mode through closed-loop control, requiring no manual intervention. For details, please refer to the relevant documentation. Figure 1 and Figure 2 When the water obtained from gravity coalescence separation meets the preset discharge conditions, the control device 40 controls the opening of pipeline valves 1# and 4#, causing the gravity coalescence separator 31 to discharge the water obtained from gravity coalescence separation. When the water obtained from gravity coalescence separation does not meet the preset discharge conditions, the control device 40 controls the opening of pipeline valves 10# and 8#, causing the gravity coalescence separator 31 to transfer the water obtained from gravity coalescence separation to the membrane separator 32. When the water obtained from membrane separation meets the preset discharge conditions, the control device 40 controls the opening of pipeline valve 8#, causing the membrane separator 32 to discharge the water obtained from membrane separation. When the water obtained from membrane separation does not meet the preset discharge conditions, the control device 40 controls the opening of pipeline valve 9#, causing the membrane separator 32 to lead the water obtained from membrane separation to the oily wastewater tank 20.

[0046] In some embodiments, the control device 40 is configured to connect the outlet of the gravity coalescing separator 31 to an external water body and connect the inlet of the gravity coalescing separator 31 to the sludge tank 50 when the content of sludge oil in the gravity coalescing separator 31 meets the first transfer condition.

[0047] When the oil content in the gravity coalescing separator 31 reaches the first transfer condition during operation, the control device 40 initiates the backwashing process. At this time, the valve at the outlet opens, and external water is introduced into the gravity coalescing separator 31, using water pressure to peel off the oil adhering to the surface of the separation elements. Simultaneously, the inlet switches to the pipeline connected to the oily wastewater tank 50, transporting the oily wastewater generated during flushing to the oily wastewater tank 50 for temporary storage. This process can be performed periodically to ensure the cleanliness of the gravity coalescing separator 31 and prevent oil accumulation that could lead to a decrease in separation efficiency. For more details, refer to the relevant documentation. Figure 1 and Figure 2 When the oil content in the gravity coalescing separator 31 meets the first transfer condition, the control device 40 controls the opening of pipeline valves 3#, 6# and 12#, so that the outlet of the gravity coalescing separator 31 is connected to an external water body. The external water body is introduced into the gravity coalescing separator 31 from the outlet and is flushed. The oily wastewater formed after flushing is discharged from the inlet of the gravity coalescing separator 31 to the oily waste tank 50.

[0048] In some embodiments, the inlet pressure of the external water body can be configured to be higher than the internal operating pressure of the gravity coalescing separator 31, for example, by using a booster pump to power the backwash water flow. A one-way valve can be installed on the connection line between the sludge tank 50 and the water inlet to prevent backflow of oily wastewater.

[0049] In some embodiments, the outlet of the gravity coalescing separator 31 is connected in sequence to a drain pump 33 and a discharge filter 34, and the drain pump 33 pumps the water obtained by gravity coalescing to the discharge filter 34 for discharge.

[0050] The drain pump 33 can be implemented using a plunger pump, which improves water transport efficiency through mechanical pressurization. The discharge filter 34 can be implemented using a multi-layer stainless steel filter screen structure, which further removes suspended particulate matter from the water through physical interception.

[0051] After the gravity coalescing separator 31 completes the initial gravity coalescing separation, its outlet is connected to the inlet of the drainage pump 33 via a pipe. Once the drainage pump 33 starts, it pressurizes and delivers the water obtained from the gravity coalescing separation to the inlet of the discharge filter 34. The discharge filter 34 contains multiple layers of filter media; the water obtained from the gravity coalescing separation is filtered and discharged from the outlet of the discharge filter 34 to the outside of the ship. The pressurizing effect of the drainage pump 33 overcomes pipe resistance and maintains a stable flow rate, while the discharge filter 34 performs deep purification of the water, ensuring that the final discharged water meets environmental standards.

[0052] In summary, the ship oily wastewater treatment system provided in this application embodiment is equipped with an oily wastewater treatment device capable of real-time gravity coalescence separation and membrane separation. Through a dual-condition adaptive switching mechanism, energy consumption allocation is optimized while ensuring that discharge standards are met. When the oil content of the water obtained from gravity coalescence separation is low, only the gravity coalescence separator needs to be activated to complete the treatment. Conversely, when the oil content is high, both gravity coalescence separation and membrane separation are activated simultaneously to treat the oily wastewater. Compared with a single treatment mode, this improves the treatment accuracy of ship oily wastewater. Furthermore, the multiple oily wastewater wells arranged in different zones, in conjunction with a centralized oily wastewater tank, efficiently collect oily wastewater from various areas of the ship and effectively alleviate the liquid level fluctuation problem caused by simultaneous drainage from multiple areas, thereby improving the collection efficiency of ship oily wastewater.

[0053] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0054] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A ship oily wastewater treatment system, characterized in that, include: Multiple oil and wastewater wells are located in various areas of the ship; Oily wastewater tank, connected to the oily wastewater well; An oily wastewater treatment device, connected to the oily wastewater tank, can operate in a first working condition and a second working condition; the first working condition is to perform gravity coalescence separation on the oily wastewater entering from the oily wastewater tank and discharge the water obtained by gravity coalescence separation; the second working condition is to perform gravity coalescence separation on the oily wastewater entering from the oily wastewater tank and perform membrane separation on the water obtained by gravity coalescence separation. A control device is configured to operate the oily wastewater treatment device in the first operating condition when the water obtained by gravity coalescence separation meets the preset discharge conditions, and to operate the oily wastewater treatment device in the second operating condition when the water obtained by gravity coalescence separation does not meet the preset discharge conditions.

2. The ship oily wastewater treatment system according to claim 1, characterized in that, The control device is further configured to, when the oily wastewater treatment device is operating in the second operating condition and the water obtained by gravity coalescence separation is detected to meet the preset discharge conditions, switch the oily wastewater treatment device to operate in the first operating condition.

3. The ship oily wastewater treatment system according to claim 1, characterized in that, Also includes: Oily waste tank, connected to the oily wastewater treatment device; The control device is also used to, when the content of sludge in the oily wastewater treatment device meets the first transfer condition, cause the oily wastewater treatment device to operate in a third working condition; the third working condition is to connect to an external water body to backwash the sludge in the oily wastewater treatment device and discharge the sludge discharged from the backwash to the sludge tank.

4. The ship oily wastewater treatment system according to claim 3, characterized in that, The control device is also configured to configure the operating cycle and / or operating duration of the oily wastewater treatment device in the third operating condition based on the oil content of the oily wastewater treatment device.

5. The ship oily wastewater treatment system according to claim 1, characterized in that, The control device is further configured to, when the content of oily wastewater in the oily wastewater well meets the second transfer condition, transfer the oily wastewater from the oily wastewater well to the oily wastewater tank, and when the content of oily wastewater in the oily wastewater tank meets the third transfer condition, transfer the oily wastewater from the oily wastewater tank to the oily wastewater treatment device.

6. The ship oily wastewater treatment system according to claim 1, characterized in that, The control device is also used to transfer oily wastewater from the oily wastewater well to the oily wastewater tank and to transfer oily wastewater from the oily wastewater tank to the outside of the ship, so that the liquid levels of both the oily wastewater well and the oily wastewater tank are reduced to below the corresponding target liquid levels.

7. The ship oily wastewater treatment system according to any one of claims 1 to 6, characterized in that, The oily wastewater treatment device includes: A gravity coalescing separator, connected to the oily wastewater tank, is used to perform gravity coalescing separation on the oily wastewater entering from the oily wastewater tank; A membrane separator, connected to the gravity coalescing separator, is used to perform membrane separation on the water obtained from the gravity coalescing separation when the water obtained from the gravity coalescing separation does not meet the preset discharge conditions.

8. The ship oily wastewater treatment system according to claim 7, characterized in that, The control device is used to, when the water obtained by gravity coalescence separation meets the preset discharge conditions, cause the gravity coalescence separator to discharge the water obtained by gravity coalescence separation, and conversely, cause the gravity coalescence separator to transfer the water obtained by gravity coalescence separation to the membrane separator, and cause the membrane separator to discharge the water obtained by membrane separation when the water obtained by membrane separation meets the preset discharge conditions.

9. The ship oily wastewater treatment system according to claim 7, characterized in that, The control device is used to connect the outlet of the gravity coalescing separator to an external water body and connect the inlet of the gravity coalescing separator to the oily waste tank when the oil content in the gravity coalescing separator meets the first transfer condition.

10. The ship oily wastewater treatment system according to claim 7, characterized in that, The outlet of the gravity coalescing separator is connected in sequence to a drain pump and a discharge filter. The drain pump pumps the water obtained from the gravity coalescing separation to the discharge filter for discharge.

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