Domestic sewage treatment system and intelligent backwashing device thereof

Abstract

The invention relates to a domestic sewage treatment system and an intelligent backwashing device thereof. The intelligent backwashing device comprises a control unit, an electrolytic bath, a pollution discharge control valve, a seawater inlet control valve and a detection unit. And the blowdown control valve is arranged at a blowdown pipeline of the electrolytic bath and is electrically connected with the control unit. And the seawater inlet control valve is arranged at a seawater inlet pipeline of the electrolytic bath and is electrically connected with the control unit. The detection unit is used for detecting actual working data reflecting the current electrolysis capacity of the electrolytic cell and sending the actual working data to the control unit. The control unit is used for judging whether the electrolytic capacity of the electrolytic bath is qualified or not according to whether the actual working data is within a preset standard range or not, if not, uploading a judgment result to the central control system to give an alarm, and controlling the seawater inlet control valve to be opened and the seawater outlet control valve to be closed when the domestic sewage treatment system is not operated and a backwashing mode is started. And the sewage discharge control valve is controlled to be opened when backwashing is completed, so that sewage after washing is discharged.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a domestic sewage treatment system and an intelligent backwashing device thereof. Background Art

[0002] The domestic sewage treatment device is the most important environmental protection equipment for offshore production facilities. It is responsible for treating the COD value (Chemical Oxygen Demand) of domestic sewage to meet the discharge standards, which is related to the safe production and compliance operation of the facility. The domestic sewage treatment system used on a certain offshore facility adopts an electrolysis treatment process system. However, due to the process of the process system, the debris in the domestic sewage is particularly easy to stick to the electrode plates, thereby increasing the resistance between the plates, reducing the electrolysis effect, and increasing the current. In severe cases, the electrode plates will be short-circuited and damaged. The failure rate of this equipment has been particularly high since it was put into use, and it needs to be backwashed twice a day during peak periods. For this reason, the electrode plates need to be replaced once a year according to the manufacturer's recommendations, resulting in excessively high maintenance costs. Therefore, the cleaning of the electrolytic cell is particularly important and is related to the normal operation of the domestic sewage treatment device. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a domestic sewage treatment system and an intelligent backwashing device thereof.

[0004] The technical solution adopted by the present invention to solve its technical problem is: an intelligent backwashing device for a domestic sewage treatment system, the intelligent backwashing device comprising a control unit, an electrolytic cell, a sewage control valve, a seawater inlet control valve and a detection unit;

[0005] The sewage discharge control valve is arranged at the sewage discharge pipeline of the electrolytic cell and is electrically connected to the control unit; the seawater inlet control valve is arranged at the seawater inlet pipeline of the electrolytic cell and is electrically connected to the control unit;

[0006] The electrolytic cell is used to electrolyze domestic sewage; the detection unit is communicatively connected with the control unit, and is used to detect actual working data reflecting the current electrolysis capacity of the electrolytic cell, and send it to the control unit;

[0007] The control unit is used to determine whether the electrolysis capacity of the electrolytic cell is qualified according to whether the actual working data is within a preset standard range. If it is unqualified, the judgment result is uploaded to the central control system for alarm prompting. Moreover, when the domestic sewage treatment system is not in operation, when the backwash mode is started, the seawater inlet control valve is controlled to open so that seawater flows into the electrolytic cell through the seawater inlet pipeline to clean it, and when the backwash is completed, the sewage control valve is controlled to open so that the cleaned sewage is discharged through the sewage pipeline.

[0008] Further, in the intelligent backwashing device of the present invention, the detection unit is used to detect the actual discharge data of the domestic sewage treatment system in real time and send it to the control unit;

[0009] Alternatively, the detection unit is used to detect the actual electrolysis current of the electrolytic cell in real time during the operation of the domestic sewage treatment system, and send it to the control unit.

[0010] Furthermore, in the intelligent backwashing device of the present invention, the detection unit is also used to detect the degree of dirtiness of the electrolytic cell during the backwashing mode, and send the current dirtiness detection data obtained by the detection to the control unit;

[0011] The control unit is also used for:

[0012] Determining whether the current dirt detection data meets a preset cleanliness standard;

[0013] If so, the cleaning operation is automatically terminated or the cleaning operation is terminated when a user feedback instruction to confirm the stopping of cleaning is received, and the sewage discharge control valve is controlled to open so that the sewage after cleaning is discharged.

[0014] Furthermore, in the intelligent backwashing device of the present invention, the intelligent backwashing device further comprises a button unit, and the button unit comprises a cleaning start button, a cleaning stop button, and a cleaning completion confirmation button;

[0015] The control unit is used for:

[0016] receiving a cleaning start instruction triggered by the user through the cleaning start button, and starting a backwash mode according to the cleaning start instruction;

[0017] receiving a stop cleaning instruction triggered by the user through the stop cleaning button, and ending the cleaning operation according to the stop cleaning instruction;

[0018] The cleaning completion confirmation instruction is received from the user through the cleaning completion confirmation button, and the sewage discharge control valve is controlled to open according to the cleaning completion confirmation instruction to discharge the sewage after cleaning.

[0019] Furthermore, in the intelligent backwashing device described in the present invention, the backwashing mode includes a cleaning frequency, a cleaning duration and / or an operating time of the backwashing mode.

[0020] Furthermore, in the intelligent backwashing device described in the present invention, the control unit is also used to adjust the cleaning frequency, cleaning time and / or operating time according to the actual working conditions of the domestic sewage treatment system.

[0021] Furthermore, in the intelligent backwashing device described in the present invention, the control unit adjusts the cleaning time according to the service life information and sewage discharge conditions of the electrolytic cell; or, the control unit adjusts the cleaning time according to the actual cleaning degree received.

[0022] Further, in the intelligent backwashing device of the present invention, the electrolytic cell comprises a first electrolytic cell and a second electrolytic cell, and each electrolytic cell is provided with a sewage discharge control valve and a seawater inlet control valve at corresponding positions; or,

[0023] The intelligent backwashing device also includes a visualization unit connected to the control unit, and the visualization unit is used to display the cleaning status of the electrolytic cell transmitted from the control unit in real time.

[0024] In addition, the present invention also provides a domestic sewage treatment system, including the intelligent backwashing device as described above.

[0025] Furthermore, in the domestic sewage treatment system of the present invention, it also includes a regulating treatment unit, a mixing tank, a main skid primary clean water tank and a digestion and filtration skid tank group, and the regulating treatment unit includes a crushing unit, a buffer tank and a liquid level detection unit arranged in the buffer tank;

[0026] The liquid level detection unit is connected to the control unit and is used to detect the actual liquid level of the domestic sewage in the buffer tank;

[0027] The control unit is also used for:

[0028] Determining whether a preset sewage discharge level has been reached according to the actual liquid level;

[0029] If yes, the domestic sewage is treated as follows:

[0030] Controlling the pulverizing unit to start up to pulverize impurities in the domestic sewage, and the pulverized domestic sewage enters the mixing tank to be mixed with a preset quantity of seawater;

[0031] The electrolytic cell is controlled to electrolyze the mixed domestic sewage, and after the domestic sewage after electrolysis enters the primary clean water tank of the main skid for degassing, the outlet pump is controlled to allow the degassed sewage to enter the digestion and filtration skid tank group for final treatment of sterilization, homogenization, filtration and sedimentation;

[0032] Obtain the current COD value of domestic sewage after final treatment;

[0033] When the current COD value reaches the preset qualified standard, the sewage outlet is controlled to open to discharge sewage to the outside.

[0034] The domestic sewage treatment system and intelligent backwashing device of the present invention have the following beneficial effects: The present invention can fundamentally solve the problem that the electrolytic cell is easily dirty and sticky, causing tripping or excessive current to damage the equipment. It can reduce the maintenance workload and cost of the electrolytic cell and effectively extend the service life of the electrolytic cell. It ensures the normal operation of the domestic sewage treatment equipment and guarantees the safe production and compliant operation of the facility. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0036] Figure 1 is a schematic diagram of the structure of an intelligent backwashing device provided in an embodiment of the present invention;

[0037] Figure 2 is a schematic diagram of the structure of an intelligent backwashing device provided in an embodiment of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the intelligent backwashing device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0040] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0041] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0042] Since the domestic sewage treatment system did not install a filtering device during the electrolytic cell design phase in the equipment process flow, the domestic sewage passed through the crushing pump and entered the electrolytic cell directly for electrolysis without being filtered. The debris in the domestic sewage is particularly easy to stick to the electrode plates. In the related technology, when performing the electrolytic cell backwashing operation, it is necessary to shut down the machine and then manually open the related valves for the electrolytic cell backwashing. After the cleaning is completed, the valves are closed and the system is restarted. However, such operations have some maintenance blind spots. When personnel fail to discover that the electrolytic cell has tripped and stopped in time, it may cause the domestic sewage discharge to fail to meet the standards. In addition, due to frequent operations, the valves are severely aged and worn, which increases the difficulty and cost of maintenance.

[0043] like Figure 1As shown, in one embodiment of the present invention, the intelligent backwashing device for domestic sewage treatment system of this embodiment is mainly used in domestic sewage treatment system. The domestic sewage treatment system includes a regulating treatment unit, a mixing tank, a primary clean water tank of the main skid and a digestion and filtration skid tank group. The regulating treatment unit includes a crushing unit, a buffer tank and a liquid level detection unit 50 arranged in the buffer tank. The crushing unit includes a fan and a crushing pump. Under normal operation of the domestic sewage treatment system, sewage from the living area enters the buffer tank of the regulating treatment unit. When the sewage liquid level reaches the electrolysis operation height liquid level, the PLC control unit 10 automatically starts the fan and the crushing pump to crush the impurities and dirt in the liquid. The filtered sewage enters the mixing tank. After a certain amount of seawater is added to the tank body in proportion, it is transported to the electrolytic cell 20 by the liquid supply pump for electrolysis treatment, and then degassed in the primary clean water tank of the main skid. The degassed clean water is transported to each tank body of the digestion and filtration skid unit by the liquid outlet pump, further sterilized, homogenized and filtered and settled, and discharged after the COD value of the sewage is tested to be qualified.

[0044] The intelligent backwashing device of this embodiment includes a control unit 10, an electrolytic cell 20, a sewage control valve 30, a seawater inlet control valve 40 and a detection unit 50. Alternatively, the control unit 10 may be a PLC control unit.

[0045] The sewage control valve 30 is arranged at the sewage pipeline of the electrolytic cell 20 and is electrically connected to the control unit 10. The seawater inlet control valve 40 is arranged at the seawater inlet pipeline of the electrolytic cell 20 and is electrically connected to the control unit 10. The electrolytic cell 20 is used to electrolyze domestic sewage. Alternatively, the electrolytic cell 20 may include a first electrolytic cell and a second electrolytic cell, and each electrolytic cell 20 is provided with a sewage control valve 30 and a seawater inlet control valve 40 at corresponding positions.

[0046] The detection unit 50 is connected to the control unit 10 for communication, and is used to detect the actual working data reflecting the current electrolytic capacity of the electrolytic cell, and send it to the control unit 10. The control unit 10 is used to determine whether the electrolytic capacity of the electrolytic cell is qualified according to whether the actual working data is within the preset standard range. If it is unqualified, the judgment result is uploaded to the central control system for alarm prompting. Moreover, during the non-operation period of the domestic sewage treatment system, when the backwashing mode is started, the seawater inlet control valve 40 is controlled to open, so that seawater flows into the electrolytic cell 20 through the seawater inlet pipeline to clean it, and when the backwashing is completed, the sewage control valve 30 is controlled to open to discharge the cleaned sewage through the sewage pipeline. The control unit 10 can upload the judgment result of whether the electrolytic capacity is qualified or not to the central control system in real time for prompting. Moreover, when the judgment result of the unqualified electrolytic capacity is uploaded, an alarm prompt can also be given by a preset alarm method, such as by a pop-up alarm sign. As an option, the backwashing device can also be provided with an alarm unit (not shown) to give an alarm prompt when the electrolytic capacity judgment result is unqualified, so that the user can confirm whether to start the backwashing mode according to the alarm prompt. The detection unit of this embodiment helps to determine the start-up conditions of the backwash mode.

[0047] Optionally, the detection unit 50 can detect the actual discharge data of the domestic sewage treatment system in real time and send it to the control unit. For example, the actual discharge concentration or actual discharge flow of the domestic sewage treatment system can be monitored in real time. The control unit 10 can determine whether the current electrolysis capacity of the electrolytic cell is qualified according to the actual discharge concentration or the actual discharge flow within the corresponding preset standard range. If it is within the preset standard range, it means that the current electrolysis capacity of the electrolytic cell is qualified and backwashing is not required. If it is not within the preset standard range, it means that the current electrolysis capacity of the electrolytic cell is unqualified and backwashing is required.

[0048] Optionally, the detection unit 50 can detect the actual electrolysis current of the electrolytic cell during the operation of the domestic sewage treatment system in real time, and send it to the control unit. The control unit 10 can determine whether the current electrolysis capacity of the electrolytic cell is qualified according to the actual electrolysis current within the corresponding preset standard range. If it is within the preset standard range, it means that the current electrolysis capacity of the electrolytic cell is qualified and no backwashing is required. If it is not within the preset standard range, it means that the current electrolysis capacity of the electrolytic cell is unqualified and backwashing is required. For example, the preset standard range of this embodiment can set a range based on the electrolysis rated current 10A. Outside this range, it means that the actual electrolysis current is too small or too large, which is abnormal, thereby indicating that the current electrolysis capacity of the electrolytic cell is unqualified.

[0049] Alternatively, the backwash mode includes but is not limited to a cleaning frequency, a cleaning duration, and an operating time of the backwash mode. The control unit 10 can adjust the cleaning frequency, cleaning duration, and / or operating time according to the actual working conditions of the domestic sewage treatment system. Specifically, the control unit 10 can adjust the cleaning duration according to the service life information and sewage discharge conditions of the electrolytic cell 20.

[0050] This embodiment can fundamentally solve the problem that the electrolytic cell 20 is easily dirty and sticky, causing tripping or excessive current to damage the equipment. It can reduce the maintenance workload and cost of the electrolytic cell 20 and effectively extend the service life of the electrolytic cell 20. It ensures the normal operation of the domestic sewage treatment equipment and guarantees the safe production and compliant operation of the facility.

[0051] As an option, the intelligent backwashing device of this embodiment may include a manual mode and an automatic mode. In the automatic mode, parameters such as the cleaning frequency, cleaning time, and cleaning duration can be set according to the actual operating conditions to automatically perform backwashing. In the manual mode, personnel can perform maintenance, testing, and manual cleaning according to the actual working conditions. Actual working conditions include, for example, quarterly cleaning with reagents, replacement and debugging, maintenance testing, and overhaul. For example, for example, the frequency is adjusted. If there are few people in the living area, it is cleaned once a week, and if there are many people, it can be selected once every two days. For example, the operating time can be adjusted according to the work and rest time of the personnel. It can be selected to clean at 0-2 am when the personnel are sleeping, so that the operation of the domestic sewage treatment device can be guaranteed to the greatest extent. For example, the cleaning duration can be appropriately adjusted according to the service life and sewage discharge of the electrolytic cell 20, or it can be adjusted according to the detected cleaning degree.

[0052] This embodiment can freely set the cleaning frequency and duration according to the dirty and blocked conditions of the electrolytic cell 20, reduce the duration of dirty and blocked electrolytic cell 20, keep it clean for a long time, and reduce the failure rate. The intelligent backwashing device also has a manual cleaning function, which can be cleaned and tested separately when a failure occurs or maintenance is required. The problem that the electrolytic cell 20 of the domestic sewage treatment device is easy to stick to debris is solved, and it can be promoted and applied in the construction of offshore intelligent oil fields.

[0053] In some embodiments, the detection unit 50 of the intelligent backwashing device of this embodiment can also be used to detect the degree of dirtiness of the electrolytic cell 20 during the non-operation period of the domestic sewage treatment system, and send the current dirtiness detection data obtained by the detection to the control unit 10. The control unit 10 determines whether the current dirtiness detection data reaches the preset cleanliness standard. When the preset cleanliness standard is reached, the cleaning operation is automatically terminated or the cleaning operation is terminated when the user feedback confirms the stop of cleaning, and the sewage control valve 30 is controlled to open so that the sewage after cleaning is discharged. Optionally, the detection unit 50 can perform real-time detection of the degree of dirtiness of the electrolytic cell 20 during the non-operation period of the domestic sewage treatment system.

[0054] It should be noted that the detection unit of the present invention is just a general term. Different detection units can be used to check different data. The corresponding detection modules, such as sensors, are installed in the corresponding positions to obtain the actual data of the object. The detection unit used in this embodiment to determine the detection data of the backwash mode stop condition can be different from the detection unit of the previous embodiment, and is arranged in the electrolytic cell 20. The detection unit used in the previous embodiment to monitor the actual working data reflecting the current electrolysis capacity of the electrolytic cell can be arranged at the sewage outlet of the domestic sewage treatment system to obtain the actual discharge data, or it can be arranged on the electrolytic cell plate and connected to the electrolytic cell plate to obtain the actual electrolysis current.

[0055] That is to say, optionally, during the non-operation period of the domestic sewage treatment system, the detection unit 50 detects the degree of dirtiness of the electrolytic cell 20, and sends the current dirtiness detection data obtained by the detection to the control unit 10. The control unit 10 determines whether the current dirtiness detection data reaches the preset cleaning standard. If the preset cleaning standard is reached, the backwashing mode is automatically started to clean the electrolytic cell 20. When the current dirtiness detection data reaches the preset cleanliness standard, the cleaning operation is automatically terminated, and the sewage control valve 30 is controlled to open to discharge the sewage after cleaning.

[0056] Optionally, during the non-operation period of the domestic sewage treatment system, the degree of dirtiness of the electrolytic cell 20 is detected by the detection unit 50, and the current dirtiness detection data obtained by the detection is sent to the control unit 10. The control unit 10 determines whether the current dirtiness detection data reaches the preset cleaning standard. If the preset cleaning standard is reached, the backwash mode is automatically started to clean the electrolytic cell 20. And when the current dirtiness detection data reaches the preset cleanliness standard and the instruction to confirm the stop of cleaning is received from the user, the cleaning operation is terminated, and the sewage control valve 30 is controlled to open so that the sewage after cleaning is discharged. It can be understood that when the control unit 10 determines that the current dirtiness detection data reaches the preset cleanliness standard, a prompt message can be issued to confirm whether to stop cleaning and a visual display can be performed to remind the user to feedback and confirm.

[0057] Optionally, the control unit 10 can also start the backwash mode when judging that the current dirt detection data reaches the preset cleaning standard and receiving the instruction of confirming cleaning fed back by the user, and clean the electrolytic cell 20. When the current dirt detection data reaches the preset cleanliness standard, the cleaning operation is automatically ended and the sewage control valve 30 is controlled to open so that the sewage after cleaning is discharged.

[0058] Optionally, the control unit 10 can also start the backwash mode when judging that the current dirt detection data reaches the preset cleaning standard and receiving the instruction of confirming cleaning fed back by the user, and clean the electrolytic cell 20. When the current dirt detection data reaches the preset cleanliness standard and receiving the instruction of confirming the stopping of cleaning fed back by the user, the cleaning operation is terminated, and the sewage control valve 30 is controlled to open to discharge the sewage after cleaning.

[0059] It can be understood that when the control unit 10 determines that the current dirt detection data reaches the preset cleaning standard, a prompt message on whether to perform cleaning can be issued and displayed visually to remind the user to provide feedback for confirmation.

[0060] This embodiment can freely set the cleaning frequency and duration according to the dirty and blocked conditions of the electrolytic cell 20, realize the intelligent automatic control backwashing function, reduce the duration of dirty and blocked electrolytic cell 20, keep it clean for a long time, and reduce the failure rate. It can solve the problem that the electrolytic cell 20 is easily dirty and sticky, causing tripping or excessive current to damage the equipment. It can reduce the maintenance workload and cost of the electrolytic cell 20 and effectively extend the service life of the electrolytic cell 20. It ensures the normal operation of domestic sewage treatment equipment and ensures the safe production and compliant operation of the facility. It can be promoted and applied in the construction of offshore intelligent oil fields.

[0061] In some embodiments, reference Figure 2 The intelligent backwashing device of this embodiment further includes a button unit 60, which includes a cleaning start button, a cleaning stop button, and a cleaning completion confirmation button. The control unit 10 is used to receive a cleaning start instruction triggered by the user through the cleaning start button, and start the backwashing mode according to the cleaning start instruction. Receive a cleaning stop instruction triggered by the user through the cleaning stop button, and end the cleaning operation according to the cleaning stop instruction. Receive a cleaning completion confirmation instruction from the user through the cleaning completion confirmation button, and control the sewage control valve 30 to open according to the cleaning completion confirmation instruction to discharge the sewage after cleaning.

[0062] In some embodiments, reference Figure 3 The intelligent backwashing device of this embodiment further includes a visualization unit 70 connected to the control unit 10, and the visualization unit 70 is used to display in real time the cleaning status of the electrolytic cell 20 transmitted from the control unit 10. Exemplarily, the visualization unit 70 can be a touch screen or the like.

[0063] In a specific embodiment, the intelligent backwashing device of this embodiment includes an electric control box, an S7-200PLC (PLC control unit 10), a 24V power supply, 5 buttons, a selection switch, 8 indicator lights and 4 24V electric valves. The electric control system (including S7-200PLC and several other electrical components) is installed in the electric control box. S7-200PLC is mainly used for intelligent control of the device. An electric valve is added to the sewage pipeline and the seawater inlet pipeline of the electrolytic cell 20. The electric valve has a valve position indication, and the corresponding contacts act when the valve is opened and closed. For example: the sewage electric valve A1 of the A electrolytic cell 20 (the first electrolytic cell 20), the seawater inlet solenoid valve A2; the sewage electric valve B1 of the B electrolytic cell 20 (the second electrolytic cell 20), the seawater inlet solenoid valve B2. The functions of the 5 buttons are: electrolytic cell A cleaning start button, electrolytic cell B cleaning start button, cleaning completion confirmation button, stop cleaning button, fault reset button, etc. The functions of the 8 indicator lights are: power indication, fault indication, B wash indication, A wash indication, A1 valve open, A2 valve open, B1 valve open, B2 valve open. The function of the selection switch is: selection between automatic mode and manual mode.

[0064] Regarding the automatic function, when the selector switch is turned to automatic, the system automatically cleans. The cleaning frequency, cleaning time, cleaning duration, etc. can be set according to the actual working conditions. The steps of the automatic cleaning function are as follows:

[0065] (1) SA1 is set to automatic. (2) The intelligent backwashing device sends a cleaning instruction to the domestic sewage treatment system. The domestic sewage treatment system automatically shuts down and waits for the domestic sewage treatment system to stop running. (3) The intelligent device starts to clean electrolytic cell A, and the cleaning indicator light of A comes on. (4) The intelligent device sends an opening instruction to the A1\A2 valves of electrolytic cell A. (5) After the intelligent device receives the feedback instruction of the A1\A2 valve opening, the A1\A2 valve opening indicator light comes on. The cleaning time starts to be counted, and the time can be adjusted according to the actual situation. (6) After the A electrolytic cell 20 is cleaned, the A1\A2 valves of the electrolytic cell A are closed, and the A1\A2 valve opening indicator light goes out. (7) After the intelligent device receives the feedback instruction of the A1\A2 valve opening, it starts to clean the B electrolytic cell 20. (8) The intelligent device sends an opening instruction to the B1\B2 valves of the electrolytic cell B. The B1\B2 valve opening indicator light comes on. The cleaning time starts to be counted, and the time can be adjusted according to the actual situation. (9) After the B electrolytic cell 20 is cleaned, the B1\B2 valves of the electrolytic cell B are closed, and the B1\B2 valve open indicator light goes out. After receiving the valve closing command, the intelligent backwashing device sends a cleaning completion signal to the PLC control unit 10, so that the domestic sewage treatment system starts to operate again. (10) The intelligent cleaning device waits for the next cleaning time. (11) If the valve cannot be opened or closed properly during the automatic cleaning process, a fault alarm message will be issued, and the abnormal signal will be transmitted to the central control system for timely scheduling and processing through the central control system. (12) After processing, press the reset button again, and the device will be put into use normally again.

[0066] Regarding the manual function, when the selection switch is turned to manual, the system can manually control the opening and closing of each valve, and can individually control the cleaning of each electrolytic cell 20. (1) Personnel manually stop the domestic sewage treatment system. (2) Turn the selection switch SA1 to manual. (3) Press the button "A Wash", and the "A Wash" indicator light is on. (4) The electric valve A1 / A2 opens. (5) After a period of time, the A1 / A2 valve is fully opened and the indicator light is on. (6) Press the "Stop Wash" button, the A1 / A2 valve is closed, and the indicator light is off. (7) The A Wash indicator light is off. (8) Then press the "Finish Wash" button, and the domestic sewage treatment system can be flushed and started. (9) Press the "B Wash" button, and the "B Wash" indicator light is on. (10) The electric valve B1 / B2 opens. (11) After a period of time, the B1 / B2 valve is fully opened and the indicator light is on. (12) Press the "Stop Wash" button, the B1 / B2 valve is closed, and the indicator light is off. (13) The B Wash indicator light is off. (14) Then press the “Finish” button to start flushing the domestic sewage treatment system.

[0067] This embodiment can freely set the cleaning frequency and duration according to the dirty and blocked conditions of the electrolytic cell 20, reduce the duration of dirty and blocked electrolytic cell 20, keep it clean for a long time, and reduce the failure rate. The intelligent backwashing device also has a manual cleaning function, which can be cleaned and tested separately when a failure occurs or maintenance is required. The problem that the electrolytic cell 20 of the domestic sewage treatment device is easy to stick to debris is solved, and it can be promoted and applied in the construction of offshore intelligent oil fields.

[0068] In another embodiment provided by the present invention, the domestic sewage treatment system of this embodiment includes the intelligent backwashing device of the above embodiment. The domestic sewage treatment system also includes a regulating treatment unit, a mixing tank, a main skid primary clean water tank and a digestion and filtration skid tank group, and the regulating treatment unit includes a crushing unit, a buffer tank and a liquid level detection unit 50 arranged in the buffer tank. The liquid level detection unit 50 is connected to the control unit 10 and is used to detect the actual liquid level of the domestic sewage in the buffer tank. The control unit 10 is also used to: determine whether the preset sewage discharge level is reached according to the actual liquid level. If so, the domestic sewage is treated as follows: the crushing unit is controlled to start to crush the impurities in the domestic sewage, and the crushed domestic sewage enters the mixing tank and is mixed with the preset quantitative seawater. The electrolytic cell 20 is controlled to electrolyze the mixed domestic sewage, and after the domestic sewage after electrolysis enters the main skid primary clean water tank for degassing, the outlet pump is controlled to allow the degassed sewage to enter the digestion and filtration skid tank group for final treatment of sterilization, homogenization, filtration and sedimentation. The current COD value of the domestic sewage after the final treatment is obtained. When the current COD value reaches the preset qualified standard, the sewage outlet is controlled to open to discharge sewage. That is to say, when the domestic sewage treatment system is in normal working condition, the sewage from the living area enters the buffer tank of the regulating treatment unit. When the sewage level reaches the electrolysis operation height level (preset sewage level), the PLC control unit 10 automatically starts the fan and the crushing pump to crush the impurities and dirt in the liquid. The filtered sewage enters the mixing tank. After a certain amount of seawater is added to the tank body in proportion, it is transported to the electrolytic cell 20 by the liquid supply pump for electrolysis treatment, and then degassed in the primary clean water tank of the main skid. The degassed clean water is transported by the liquid outlet pump to each tank of the digestion and filtration skid unit for further sterilization, homogenization, and filtration and sedimentation. After the COD value of the sewage is tested to be qualified, it is discharged to the outside.

[0069] This embodiment can fundamentally solve the problem that the electrolytic cell is easily dirty and sticky, causing tripping or excessive current to damage the equipment. It can reduce the maintenance workload and cost of the electrolytic cell and effectively extend the service life of the electrolytic cell. It ensures the normal operation of the domestic sewage treatment equipment and guarantees the safe production and compliant operation of the facility.

[0070] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0071] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0072] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. An intelligent backwashing device for a domestic sewage treatment system, characterized in that: The intelligent backwashing device comprises a control unit, an electrolytic cell, a sewage discharge control valve, a seawater inlet control valve and a detection unit; The sewage discharge control valve is arranged at the sewage discharge pipeline of the electrolytic cell and is electrically connected to the control unit; the seawater inlet control valve is arranged at the seawater inlet pipeline of the electrolytic cell and is electrically connected to the control unit; The electrolytic cell is used to electrolyze domestic sewage; the detection unit is communicatively connected with the control unit, and is used to detect actual working data reflecting the current electrolysis capacity of the electrolytic cell, and send it to the control unit; The control unit is used to determine whether the electrolysis capacity of the electrolytic cell is qualified according to whether the actual working data is within a preset standard range. If it is unqualified, the judgment result is uploaded to the central control system for alarm prompting. Moreover, when the domestic sewage treatment system is not in operation, when the backwash mode is started, the seawater inlet control valve is controlled to open so that seawater flows into the electrolytic cell through the seawater inlet pipeline to clean it, and when the backwash is completed, the sewage control valve is controlled to open so that the cleaned sewage is discharged through the sewage pipeline.

2. The intelligent backwashing device according to claim 1, characterized in that: The detection unit is used to detect the actual discharge data of the domestic sewage treatment system in real time and send it to the control unit; Alternatively, the detection unit is used to detect the actual electrolysis current of the electrolytic cell in real time during the operation of the domestic sewage treatment system, and send it to the control unit.

3. The intelligent backwashing device according to claim 1 or 2, characterized in that: The detection unit is also used to detect the degree of dirtiness of the electrolytic cell during the backwash mode, and send the current dirtiness detection data obtained by the detection to the control unit; The control unit is also used for: Determining whether the current dirt detection data meets a preset cleanliness standard; If so, the cleaning operation is automatically terminated or the cleaning operation is terminated when a user feedback instruction to confirm the stopping of cleaning is received, and the sewage discharge control valve is controlled to open so that the sewage after cleaning is discharged.

4. The intelligent backwashing device according to claim 1, characterized in that: The intelligent backwashing device also includes a button unit, which includes a cleaning start button, a cleaning stop button, and a cleaning completion confirmation button; The control unit is used for: receiving a cleaning start instruction triggered by the user through the cleaning start button, and starting a backwash mode according to the cleaning start instruction; receiving a stop cleaning instruction triggered by the user through the stop cleaning button, and ending the cleaning operation according to the stop cleaning instruction; The cleaning completion confirmation instruction is received from the user through the cleaning completion confirmation button, and the sewage discharge control valve is controlled to open according to the cleaning completion confirmation instruction to discharge the sewage after cleaning.

5. The intelligent backwashing device according to claim 1, characterized in that: The backwash mode includes a cleaning frequency, a cleaning duration and / or an operating time of the backwash mode.

6. The intelligent backwashing device according to claim 5, characterized in that: The control unit is also used to adjust the cleaning frequency, cleaning duration and / or operating time according to the actual working conditions of the domestic sewage treatment system.

7. The intelligent backwashing device according to claim 6, characterized in that: The control unit adjusts the cleaning time according to the service life information and sewage discharge conditions of the electrolytic cell; or, the control unit adjusts the cleaning time according to the received actual cleaning degree.

8. The intelligent backwashing device according to claim 1, characterized in that: The electrolytic cell comprises a first electrolytic cell and a second electrolytic cell, each electrolytic cell is provided with a sewage discharge control valve and a seawater inlet control valve at corresponding positions; or The intelligent backwashing device also includes a visualization unit connected to the control unit, and the visualization unit is used to display the cleaning status of the electrolytic cell transmitted from the control unit in real time.

9. A domestic sewage treatment system, characterized in that: It comprises an intelligent backwashing device as described in any one of claims 1 to 8.

10. The domestic sewage treatment system according to claim 9, characterized in that: It also includes a regulating and processing unit, a mixing tank, a main skid primary clean water tank and a digestion and filtration skid tank group, wherein the regulating and processing unit includes a crushing unit, a buffer tank and a liquid level detection unit arranged in the buffer tank; The liquid level detection unit is connected to the control unit and is used to detect the actual liquid level of the domestic sewage in the buffer tank; The control unit is also used for: Determining whether a preset sewage discharge level has been reached according to the actual liquid level; If yes, the domestic sewage is treated as follows: Controlling the pulverizing unit to start up to pulverize impurities in the domestic sewage, and the pulverized domestic sewage enters the mixing tank to be mixed with a preset quantity of seawater; The electrolytic cell is controlled to electrolyze the mixed domestic sewage, and after the domestic sewage after electrolysis enters the primary clean water tank of the main skid for degassing, the outlet pump is controlled to allow the degassed sewage to enter the digestion and filtration skid tank group for final treatment of sterilization, homogenization, filtration and sedimentation; Obtain the current COD value of domestic sewage after final treatment; When the current COD value reaches the preset qualified standard, the sewage outlet is controlled to open to discharge sewage to the outside.

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