Control method and device for recycling waste water for aquatic product processing

Abstract

The invention relates to a wastewater recycling control method and device for aquatic product processing, and the method comprises the steps: obtaining oil drop concentration data of wastewater in an oil separation tank, and transmitting an instruction to start an aeration device in the oil separation tank when the oil drop concentration data exceeds a first preset concentration value; automatically adding a flocculating agent based on the pH value of the wastewater in the current oil separation tank; controlling a first water pump to pump the wastewater in the oil separator into an ion exchange device, acquiring target ion concentration data in the wastewater in real time, and controlling a second water pump to pump the wastewater in the ion exchange device into a reverse osmosis membrane assembly and a degassing tower; conveying the wastewater in the degassing tower to a heat source input end of the steam generator; and the steam generator is controlled to convey the dry steam subjected to steam separation treatment to a drying link of aquatic product processing, and condensate water subjected to steam separation is pumped back to the heat source input end. The method has the effect of improving the monitoring and adjusting timeliness and efficiency of each link of wastewater recycling in aquatic product processing.

Description

Technical Field

[0001] The present application relates to the technical field of aquatic product processing, and in particular to a control method and device for recycling wastewater used in aquatic product processing. Background Art

[0002] Aquatic product processing wastewater refers to industrial wastewater generated during the processing of aquatic food. It has the characteristics of high organic matter, high suspended solids, high oil and salt, and may be accompanied by changes in temperature and pH value and odor. Therefore, the wastewater needs to be treated by comprehensive physical, chemical and biological methods to meet the standards for discharge or recycling and reduce the degree of environmental pollution.

[0003] After treating aquatic processing wastewater to meet certain water quality standards, it is recycled in the production process. During the wastewater recycling process, each treatment link needs to be monitored and controlled in real time, such as the monitoring of suspended solids, pH value, and organic matter and microbial content in the wastewater. At present, different sensors are generally used for monitoring and manual intervention and control adjustments. Due to the wide variety of monitoring items and the low data integration between the monitoring equipment of each treatment process, the timeliness of manual adjustment is poor and the efficiency is low, so it needs to be improved. Summary of the invention

[0004] In order to improve the timeliness and efficiency of monitoring and adjustment of each link of wastewater recycling and utilization in aquatic product processing, the present application provides a control method and device for recycling and utilization of wastewater for aquatic product processing.

[0005] The above-mentioned invention objective of the present application is achieved through the following technical solutions:

[0006] A control method for recycling wastewater used in aquatic product processing, comprising the steps of:

[0007] After the aquatic product processing wastewater is filtered into the grease trap, the oil drop concentration data of the wastewater in the grease trap is obtained. When the oil drop concentration data exceeds a first preset concentration value, a command is sent to start the aeration device in the grease trap; and flocculants are automatically added based on the current pH value of the wastewater in the grease trap;

[0008] When the oil drop concentration data is less than the first preset concentration value, the first water pump is controlled to pump the wastewater in the oil separator into the ion exchange device, and the target ion concentration data in the wastewater is obtained in real time; when the target ion concentration data is less than the second preset concentration value, the second water pump is controlled to pump the wastewater in the ion exchange device into the reverse osmosis membrane assembly;

[0009] After controlling the third water pump to transport the waste water from the reverse osmosis membrane assembly to the degassing tower, controlling the fourth water pump to transport the waste water in the degassing tower to the heat source input end of the steam generator;

[0010] The steam generator is controlled to deliver the dry steam after steam separation to the drying process of aquatic product processing, and the fifth water pump is controlled to pump the condensed water after steam separation back to the heat source input end.

[0011] By adopting the above technical scheme, after the wastewater generated by aquatic product processing is filtered and enters the oil separator, the oil droplet concentration data in the wastewater can be automatically obtained and compared, and the command is realized to automatically start the aeration device to accelerate the oil-water separation, and further automatically add flocculants in combination with the pH value to accelerate the formation of oil droplets; after the oil-water separation treatment is completed, the first water pump is controlled to automatically transport the wastewater for ion exchange to soften the water quality, so that the subsequent steam generator is not easy to scale. After the ion exchange is completed, the second water pump is controlled to automatically input the wastewater into the reverse osmosis membrane component to remove most of the organic matter and microorganisms, and then the wastewater is transported to the degassing tower to remove dissolved oxygen and dissolved dioxin in the water. Carbon dioxide is produced, and finally the fourth water pump automatically transports the wastewater from which suspended solids, grease, target ions, organic matter and microorganisms have been removed to the steam generator. The obtained steam is dried and used in the drying process of aquatic product processing, and the condensed water is automatically recovered to the steam generator for reheating and utilization. During the entire recycling process, the wastewater quality at each link is tested, and the test data obtained is converted into control instructions to control the entire process of wastewater to dry steam recycling, saving manual intervention links. The comparison of data can be converted into instructions in time to adjust water quality parameters and execute steps, thereby improving the timeliness and efficiency of monitoring and adjustment of each link in wastewater recycling in aquatic product processing.

[0012] Optionally, after the aquatic product processing wastewater is filtered into the grease trap, oil droplet concentration data of the wastewater in the grease trap is obtained, and when the oil droplet concentration data exceeds a first preset concentration value, an instruction is sent to start an aeration device in the grease trap; and flocculants are automatically added based on the current pH value of the wastewater in the grease trap; including:

[0013] After the aquatic product processing wastewater is filtered into the grease trap, a start command is sent to the sampling pump to drive the water inlet pipe of the sampling pump to move vertically along the grease trap, and wastewater samples are collected at intervals during the movement.

[0014] The wastewater samples collected at intervals are all sent to the detection container, and a start instruction is sent to the turbidity sensor in the detection container to obtain oil drop concentration data;

[0015] When the oil drop concentration data exceeds a first preset concentration value, starting an aeration device in the grease trap and obtaining a pH value of wastewater in the current grease trap;

[0016] When the pH value is within a preset range, a start instruction is sent to the flocculant output container to add a preset amount of flocculant to the grease trap;

[0017] Send start instructions to the sampling pump at intervals.

[0018] By adopting the above technical scheme, in order to obtain more accurate data on oil droplet concentration in the wastewater in the grease trap, wastewater interval sampling is performed by moving the water inlet pipe to obtain wastewater samples with different spatial distributions in the grease trap. Further addition of flocculants is helpful for the flocculation effect of suspended matter and dissolved matter. Before the addition of flocculants, the automatic adjustment of the pH value can maximize the flocculation effect of the flocculant. The flocculant output container is automatically controlled to output a quantitative amount of flocculant through the start instruction, making the adjustment feedback of wastewater recycling more timely and efficient.

[0019] Optionally, when the oil drop concentration data is less than a first preset concentration value, the step of controlling the first water pump to pump the wastewater in the grease trap into the ion exchange device comprises:

[0020] When the oil drop concentration data is less than the first preset concentration value, obtaining the oil layer thickness data at the top of the wastewater in the grease trap;

[0021] Adjust the movement parameters of the oil scraper based on the oil layer thickness data;

[0022] Generate a start command based on the movement parameters and send it to the oil scraper;

[0023] When the oil scraper completes the oil skimming operation, the first water pump is controlled to pump the waste water in the grease trap into the ion exchange device.

[0024] By adopting the above technical scheme, the oil scraper is located on the top of the oil separator tank and is used to scrape off the oil layer on the top of the wastewater. However, the moving speed of the oil scraper should not be too high during the movement. If the moving speed is too high, the oil layer will be easily broken up. Therefore, the movement parameters of the oil scraper are adjusted according to the thickness of the oil layer. If the oil layer is thick, the speed of the oil scraper should be reduced, thereby reducing the instantaneous acceleration of the oil scraper on the oil layer, making it difficult for the oil layer to be broken up. After the skimming operation is completed, the first water pump is automatically controlled to start, thereby reducing the risk of the oil layer being extracted by the first water pump and making the recovery process more efficient and timely.

[0025] Optionally, the target ion concentration data includes calcium ion Ca 2 + concentration data and magnesium ion Mg2+ concentration data; when the target ion concentration data is less than the second preset concentration value, controlling the second water pump to pump the wastewater in the ion exchange device into the reverse osmosis membrane assembly; comprising:

[0026] When the target ion concentration data is less than the second preset concentration value, the pH value of the current wastewater is obtained, and the pH value of the wastewater is adjusted to within a preset range;

[0027] A pressure detection instruction is sent to the second water pump to obtain the pressure parameter of the second water pump. When the pressure parameter is within the preset pressure range, a start instruction is sent to the second water pump. After receiving the start instruction, the second water pump transports the wastewater in the ion exchange device through the multi-media filter and the activated carbon filter, and then pumps it into the reverse osmosis membrane assembly.

[0028] By adopting the above technical solution, the calcium ions Ca in the wastewater are exchanged by the sodium ions of the ion exchange device. 2 + and magnesium ions Mg2+, thereby making the steam generator less prone to scaling. By automatically identifying the target ion concentration data and automatically adjusting the pH value of the wastewater in the current ion exchange device when it is less than the second preset concentration value, since the RO membrane in the reverse osmosis component has a higher flux under alkaline conditions and may be affected by pollution and scaling under acidic conditions, the adjustment of the pH value keeps the performance of the reverse osmosis membrane normal, ensuring the water quality of wastewater recycling.

[0029] Optionally, after controlling the third water pump to transport the wastewater from the reverse osmosis membrane assembly to the degassing tower, controlling the fourth water pump to transport the wastewater in the degassing tower to the heat source input end of the steam generator; comprising:

[0030] Control the third water pump to transport the wastewater from the reverse osmosis membrane assembly to the degassing tower for degassing treatment, and determine whether the dissolved oxygen concentration data and dissolved carbon dioxide concentration data of the wastewater in the degassing tower meet the standards;

[0031] If the standard is met, the fourth water pump is controlled to transport the waste water in the degassing tower to the heat source input end of the steam generator.

[0032] By adopting the above technical solution, the degassing treatment in the degassing tower can reduce the corrosion and scaling problems in the steam generator, and after the degassing treatment is completed, the dissolved oxygen concentration data and the dissolved carbon dioxide concentration data are automatically identified again, and after judging whether the effect of the degassing treatment meets the standard, the fourth water pump is automatically controlled to pump the wastewater into the steam generator for heating and evaporation.

[0033] Optionally, the step of controlling the steam generator to deliver the dry steam after steam separation to the drying step of aquatic product processing, and controlling the fifth water pump to pump the condensed water after steam separation back to the heat source input end includes:

[0034] Control the steam generator to heat the degassed wastewater to generate steam, and obtain dry steam after steam separation treatment, and then transport the dry steam to the drying stage of aquatic product processing;

[0035] The concentrated liquid produced after the wastewater is heated and evaporated is transported to the crystallizer, and the salt crystals are separated from the mother liquor by centrifugal separation;

[0036] The volume data of the condensed water in the condensed water container after the steam separation treatment is monitored, and when the volume data is greater than a preset volume value, the fifth water pump is controlled to pump the condensed water back to the heat source input end.

[0037] By adopting the above technical scheme, the steam generated by the steam generator when heating the wastewater is subjected to steam separation treatment to obtain dry steam for the drying step of the aquatic product processing link, thereby realizing the recycling and reuse of the wastewater, and the salt generated by the wastewater can be obtained after passing through the crystallizer to obtain salt crystals for salt products in aquatic product processing. Finally, the water after steam separation can also be pumped back to the heat source input end of the steam generator through the fifth water pump for reheating and evaporation, thereby realizing the multi-purpose recycling of wastewater recovery.

[0038] Optionally, after the step of controlling the fifth water pump to pump the condensed water back to the heat source input end, the step further includes:

[0039] When the steam generator is not in working state, the working index of the reverse osmosis membrane assembly is obtained, and the working index includes flux data, salt permeability data and pressure difference data;

[0040] When the working index is not up to standard, determine whether there is any remaining condensed water in the condensed water container;

[0041] If yes, the condensate is pumped back to the cleaning mechanism of the reverse osmosis membrane assembly through the sixth water pump;

[0042] When the liquid level in the water tank of the cleaning mechanism reaches a preset height, a start instruction is sent to the cleaning agent output device of the cleaning mechanism;

[0043] The cleaning agent output device outputs a preset amount of membrane cleaning agent to the water tank for mixing;

[0044] A start command is sent to the cleaning mechanism to clean the reverse osmosis membrane assembly.

[0045] By adopting the above technical solution, the reverse osmosis membrane assembly is prone to scaling after long-term use, resulting in reduced performance. Therefore, when the steam generator is not in operation, if the current working indicators of the reverse osmosis membrane assembly are not up to standard, the condensed water after steam separation by the steam generator can also be used to clean the reverse osmosis membrane assembly. The corresponding volume of condensed water is automatically obtained by the sixth water pump to the water tank and the automatic addition of cleaning agent is controlled to achieve automatic cleaning of the reverse osmosis membrane assembly, thereby improving the efficiency of wastewater utilization.

[0046] The second object of the invention is achieved by the following technical solutions:

[0047] A control device for recycling wastewater used in aquatic product processing comprises a filter grid well, a grease trap, an ion exchange device, a reverse osmosis membrane assembly, a degassing tower, a steam generator and a data processor.

[0048] The filter grid well is used to fill the wastewater from aquatic product processing, the grid well is connected to the grease trap, the grease trap is connected to the ion exchange device through the first water pump, the output end of the ion exchange device is connected to the reverse osmosis membrane assembly through the second water pump, the output end of the reverse osmosis membrane is connected to the degassing tower through the third water pump, the output end of the degassing tower is connected to the steam generator through the fourth water pump, and the steam output end of the steam generator is used to connect to the air inlet channel of the drying environment in the aquatic product processing; the degassing tower, the ion exchange device and the steam generator are all in communication connection with the data processor;

[0049] An aeration device is fixed at the bottom of the grease trap, the grease trap is provided with a turbidity sensor to obtain oil drop concentration data, a pH sensor to obtain the pH value of wastewater, and is connected to a flocculant output container;

[0050] The ion exchanger is provided with an ion concentration sensor to obtain target ion concentration data;

[0051] The condensate output end of the steam generator is connected to the heat source input end of the steam generator through a fifth water pump;

[0052] The aeration device, turbidity sensor, pH sensor, flocculant output container, ion concentration sensor, first water pump, second water pump, third water pump, fourth water pump and fifth water pump are all connected to the data processor for communication.

[0053] By adopting the above technical scheme, the data processor is connected to the aeration device, flocculant output solvent, degassing tower, ion exchange device, and steam generator to control their automatic operation and shutdown. Furthermore, the data processor is connected to the turbidity sensor, pH sensor, and ion concentration sensor to receive detection data. After data comparison, instructions are generated to control the actions of various devices and water pumps, thereby realizing fully automated operations for wastewater recycling and improving the efficiency and timeliness of the wastewater recycling environment.

[0054] Optionally, a sampling pump is installed on the top of the grease trap, and the sampling pump is communicatively connected to the data processor. The sampling pump includes a driving assembly, a pump body, and a water inlet pipe. The water inlet pipe is flexible. The driving assembly is used to drive one end of the water inlet pipe to move along the depth direction of the grease trap, and the other end of the water inlet pipe is connected to the pump body. The pump body is connected to a detection container, and the turbidity sensor is installed in the detection container.

[0055] Optionally, the driving assembly includes a servo motor and a transmission block, the servo motor and the transmission block are both fixed to the ground or a plane, the transmission block is provided with a transmission channel, the transmission block is rotatably connected to a transmission gear and a driven gear, the transmission gear is located above the transmission channel, the driven gear is located below the transmission channel, the transmission gear is fixed to the output shaft of the servo motor, the water inlet pipe passes through the transmission channel, the outer surface of the water inlet pipe is provided with a toothed protrusion, and the toothed protrusion is meshed with the transmission gear and the driven gear.

[0056] By adopting the above technical solution, the transmission gear is driven to rotate by the servo motor. Since the outer surface of the water inlet pipe is provided with tooth-like protrusions that mesh with the transmission gear, the transmission gear rotates to drive the water inlet pipe to move along the direction of the transmission channel, and the driven gear provides support and guidance for the movement of the water inlet pipe, thereby enhancing the stability of the movement of the water inlet pipe. Changing the direction of the servo motor realizes the reciprocating motion of the water inlet pipe, thereby enabling the water inlet pipe to extend into different depths of the grease trap for wastewater sampling.

[0057] In summary, the present application includes at least one of the following beneficial technical effects:

[0058] 1. Automatically transport the wastewater from which suspended solids, grease, target ions, organic matter and microorganisms have been removed to the steam generator. The steam obtained is dried and used in the drying process of aquatic product processing, and the condensed water is automatically recycled to the steam generator for reheating and reuse. During the entire recycling process, the wastewater quality of each link is tested, and the test data obtained is converted into control instructions to control the entire process of recycling the wastewater to dry steam, saving manual intervention. The data comparison can be converted into instructions in a timely manner to adjust the water quality parameters and execute the steps, thereby improving the timeliness and efficiency of monitoring and adjustment of each link of wastewater recycling in aquatic product processing;

[0059] 2. The oil droplet concentration data of wastewater in the grease trap is obtained more accurately. The wastewater is sampled at intervals by moving the water inlet pipe to obtain wastewater samples with different spatial distributions in the grease trap. The addition of flocculants is further helpful for the flocculation effect of suspended matter and dissolved matter. Before the addition of flocculants, the automatic adjustment of pH value can maximize the flocculation effect of the flocculants. The flocculant output container is automatically controlled to output a quantitative amount of flocculants through the start command, making the adjustment feedback of wastewater recycling more timely and efficient.

[0060] 3. The oil scraper is located on the top of the oil separator and is used to scrape off the oil layer on the top of the wastewater. However, the moving speed of the oil scraper should not be too high during the movement. Too high a moving speed will easily break up the oil layer. Therefore, the moving parameters of the oil scraper are adjusted according to the thickness of the oil layer. If the oil layer is thick, the speed of the oil scraper should be reduced, thereby reducing the instantaneous acceleration of the oil scraper on the oil layer, making it difficult for the oil layer to be broken up.

[0061] 4. The transmission gear is driven to rotate by the servo motor. Since the outer surface of the water inlet pipe is provided with a toothed protrusion which meshes with the transmission gear, the transmission gear rotates to drive the water inlet pipe to move along the direction of the transmission channel, and the driven gear provides a contact point for the movement of the water inlet pipe, thereby enhancing the stability of the movement of the water inlet pipe. Changing the direction of the servo motor realizes the reciprocating motion of the water inlet pipe, thereby being able to achieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 This is a schematic diagram of a processing flow of an embodiment of a control method for recycling wastewater used in aquatic product processing of the present application;

[0063] Figure 2 This is a schematic block diagram of a control device for recycling wastewater for aquatic product processing according to an embodiment of the present application;

[0064] Figure 3 It is a schematic diagram of the internal structure of a driving component in an embodiment of a control device for recycling wastewater for aquatic processing in the present application.

[0065] Explanation of the reference numerals: 1. filter grid well; 2. grease trap; 3. sampling pump; 4. oil scraper; 5. ion exchange device; 6. multi-media filter; 7. activated carbon filter; 8. reverse osmosis membrane assembly; 9. degassing tower; 10. steam generator; 11. cleaning mechanism; 12. first water pump; 13. second water pump; 14. third water pump; 15. fourth water pump; 16. fifth water pump; 17. sixth water pump; 18. servo motor; 19. transmission block; 20. transmission gear; 21. driven gear; 22. water inlet pipe; 221. toothed protrusion. DETAILED DESCRIPTION

[0066] The following is combined with Figure 1-3 This application is described in further detail.

[0067] In the following embodiments, Figure 1 As shown, the present application discloses a control method for recycling wastewater used in aquatic product processing, which specifically includes the following steps:

[0068] S10: After the aquatic product processing wastewater is filtered into the grease trap, the oil droplet concentration data of the wastewater in the grease trap is obtained. When the oil droplet concentration data exceeds a first preset concentration value, a command is sent to start the aeration device in the grease trap; and a flocculant is automatically added based on the current pH value of the wastewater in the grease trap;

[0069] In this embodiment, in order to filter and separate oil and water from wastewater, the wastewater passes through a screen well and / or a bag filter and / or a sand filter to filter out the larger particle size residues in the aquatic product processing wastewater, and then enters the grease trap. The oil droplet concentration data refers to the oil content data per unit volume of wastewater in the grease trap. The first preset concentration value is a custom setting. The aeration device is fixed to the bottom of the grease trap and receives start and stop instructions through a signal receiver. The flocculant can exert the best flocculation effect within a specific pH range to help remove suspended matter and some dissolved matter.

[0070] Specifically, step S10 includes the following steps:

[0071] S11: After the aquatic product processing wastewater is filtered into the grease trap, a start command is sent to the sampling pump to drive the water inlet pipe of the sampling pump to move vertically along the grease trap, and wastewater samples are collected at intervals during the movement.

[0072] S12: sending the wastewater samples collected at intervals to the detection container, and sending a start instruction to the turbidity sensor in the detection container to obtain oil drop concentration data;

[0073] S13: When the oil droplet concentration data exceeds a first preset concentration value, starting an aeration device in the grease trap and obtaining a pH value of wastewater in the current grease trap;

[0074] S14: When the pH value is within a preset range, a start instruction is sent to the flocculant output container to add a preset amount of flocculant to the grease trap;

[0075] S15: Send a start command to the sampling pump at intervals.

[0076] In this embodiment, after the sampling pump drives the water inlet pipe to move a distance reaching a preset value, the sampling pump is turned on to extract wastewater from the grease trap, so after a certain number of driving times, wastewater samples at different depths of the water inlet pipe in the grease trap are obtained, and the wastewater samples are more uniform and objective. The turbidity sensor is a light-sensitive turbidity sensor, and the preset range of pH value is 8-10.

[0077] The flocculant output container is communicated with the grease trap, and a signal receiver, a processor and an extrusion valve are arranged in the flocculant output container to receive a start instruction to output a preset amount of flocculant into the grease trap.

[0078] The sampling pump receives a start instruction at intervals to sample wastewater samples after continuous aeration and flocculant addition operations, so that it can be known in time whether the oil droplet concentration data in the current grease trap meets the standard.

[0079] S20: When the oil drop concentration data is less than the first preset concentration value, the first water pump is controlled to pump the wastewater in the oil separator into the ion exchange device, and the target ion concentration data in the wastewater is obtained in real time; when the target ion concentration data is less than the second preset concentration value, the second water pump is controlled to pump the wastewater in the ion exchange device into the reverse osmosis membrane assembly;

[0080] In this embodiment, this step is ion exchange treatment and reverse osmosis treatment. The ion exchange device is a method of softening water by exchanging hardness ions such as calcium and magnesium ions in water. The following is the composition and principle of the ion exchange device:

[0081] Ion exchange resin: This is the core part of the ion exchange device, usually small spherical particles with exchangeable sodium ions Na+.

[0082] Ion Exchange Column: A cylindrical container filled with ion exchange resin. Water flows through the resin layer and the hardness ions are replaced by sodium ions on the resin.

[0083] Regeneration system: includes the storage and dosing system of the regeneration agent, usually salt or hydrochloric acid, which is used to restore the exchange capacity of the resin.

[0084] The second preset concentration value is a custom setting. The target ion concentration data includes calcium ion Ca 2 + concentration data and magnesium ion Mg2+ concentration data.

[0085] The reverse osmosis membrane assembly is a rolled or tubular membrane that can remove most dissolved solids and hardness ions in water. Before entering the reverse osmosis membrane assembly, the wastewater also passes through a multi-media filter, an activated carbon filter, and a security filter to remove suspended solids, particulate matter, and organic matter.

[0086] Specifically, step S20 includes the following steps:

[0087] S21: when the oil drop concentration data is less than the first preset concentration value, obtaining the oil layer thickness data at the top of the wastewater in the grease trap;

[0088] S22: adjusting movement parameters of the oil scraper based on the oil layer thickness data;

[0089] S23: generating a start command based on the movement parameters and sending it to the oil scraper;

[0090] S24: After the oil scraper completes the oil skimming operation, the first water pump is controlled to pump the waste water in the grease trap into the ion exchange device.

[0091] In this embodiment, the moving speed of the oil scraper is not too high during the movement process, because too high a moving speed may easily break up the oil layer, so the moving parameters of the oil scraper are adjusted according to the thickness of the oil layer. The stability of the oil skimming process is improved by controlling the moving speed of the oil scraper.

[0092] In step S20, after step S24, the following steps are specifically included:

[0093] S25: When the target ion concentration data is less than the second preset concentration value, the pH value of the current wastewater is obtained, and the pH value of the wastewater is adjusted to within a preset range;

[0094] S26: Send a pressure detection instruction to the second water pump to obtain the pressure parameter of the second water pump. When the pressure parameter is within the preset pressure range, send a start instruction to the second water pump. After receiving the start instruction, the second water pump transports the wastewater in the ion exchange device through the multi-media filter and the activated carbon filter, and then pumps it into the reverse osmosis membrane assembly.

[0095] In this embodiment, the second preset concentration value is a custom setting, and the target ion concentration data is obtained through the corresponding ion selective electrode.

[0096] Before entering the reverse osmosis module, pH adjustment can ensure the normal flux and anti-fouling performance of the osmotic membrane. For example, the RO membrane has a higher flux under alkaline conditions, but may be affected by fouling and scaling under acidic conditions.

[0097] S30: After controlling the third water pump to transport the waste water from the reverse osmosis membrane assembly to the degassing tower, controlling the fourth water pump to transport the waste water in the degassing tower to the heat source input end of the steam generator;

[0098] In this embodiment, this step is a wastewater degassing step, and the degassing tower removes dissolved gases in the water, such as oxygen and carbon dioxide, to reduce corrosion and scaling problems in the evaporator.

[0099] Specifically, step S30 includes the following steps:

[0100] S31: Control the third water pump to transport the wastewater from the reverse osmosis membrane assembly to the degassing tower for degassing treatment, and determine whether the dissolved oxygen concentration data and dissolved carbon dioxide concentration data of the wastewater in the degassing tower meet the standards;

[0101] S32: If the standard is met, the fourth water pump is controlled to transport the waste water in the degassing tower to the heat source input end of the steam generator.

[0102] In this embodiment, the dissolved oxygen concentration data and the dissolved carbon dioxide concentration data are detected by a dissolved oxygen concentration sensor and a dissolved carbon dioxide concentration sensor, and whether the dissolved oxygen concentration threshold and the dissolved carbon dioxide concentration threshold are set is used to determine whether the standards are met.

[0103] The wastewater enters the heat source input end of the steam generator for heating and evaporation.

[0104] S40: Control the steam generator to deliver the dry steam after steam separation to the drying process of aquatic product processing, and control the fifth water pump to pump the condensed water after steam separation back to the heat source input end.

[0105] In this embodiment, this step is the heating treatment of the steam generator, the steam separation treatment and the condensation recovery treatment step. The steam separation treatment is the step of separating the water vapor after the wastewater is heated from the gas and the water droplets carried. In aquatic product processing, seafood needs to be dried and packaged, so the hot steam generated by the heating of the wastewater after recovery can be used in this link. Moreover, the condensed water after steam separation can be circulated and heated.

[0106] Specifically, step S40 includes the following steps:

[0107] S41: Controlling the steam generator to heat the degassed wastewater to generate steam, the steam is subjected to steam separation treatment to obtain dry steam, and the dry steam is transported to the drying stage of aquatic product processing;

[0108] S42: The concentrated liquid produced after the wastewater is heated and evaporated is transported to a crystallizer, and the salt crystals are separated from the mother liquid by centrifugal separation;

[0109] S43: monitoring the volume data of the condensed water in the condensed water container after the steam separation process, and when the volume data is greater than a preset volume value, controlling the fifth water pump to pump the condensed water back to the heat source input end.

[0110] In this embodiment, the salt crystals can also be dried by the dry steam output by the steam generator to obtain dry salt crystals for use in salt products in aquatic product processing.

[0111] In one embodiment, after step S43, the following steps are further performed:

[0112] S50: when the steam generator is not in working state, obtaining working indicators of the reverse osmosis membrane assembly, the working indicators including flux data, salt permeability data and pressure difference data;

[0113] S51: When the working index is not up to standard, determining whether there is any remaining condensed water in the condensed water container;

[0114] S52: If yes, the condensate is pumped back to the cleaning mechanism of the reverse osmosis membrane assembly through the sixth water pump;

[0115] S53: When the liquid level in the water tank of the cleaning mechanism reaches a preset height, a start instruction is sent to the cleaning agent output device of the cleaning mechanism;

[0116] S54: the cleaning agent output device outputs a preset amount of membrane cleaning agent to the water tank for mixing;

[0117] S55: Send a start instruction to the cleaning mechanism to clean the reverse osmosis membrane assembly.

[0118] In this embodiment, the condensed water after steam separation treatment is stored in a condensed water container and can be used for the cleaning of the reverse osmosis membrane assembly. Whether the working indicators are up to standard refers to the threshold setting of the flux data, salt permeability data and pressure difference data of the reverse osmosis membrane assembly. The wastewater passing through and not passing through the reverse osmosis membrane assembly is detected by the corresponding sensor to determine whether the reverse osmosis membrane assembly needs to be cleaned.

[0119] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0120] In one embodiment, a control device for recycling wastewater from aquatic product processing is provided, referring to Figure 2 and Figure 3 The control device for recycling wastewater from aquatic product processing corresponds to the control method for recycling wastewater from aquatic product processing in the above embodiment. The control device for recycling wastewater from aquatic product processing includes:

[0121] Filter grid well 1, grease trap 2, ion exchange device 5, reverse osmosis membrane assembly 8, degassing tower 9, steam generator 10 and data processor. In other embodiments, the filter grid well 1 of the filter grid part can also be a sand filter and a bag filter.

[0122] The filter grid well 1 is used to fill the wastewater from aquatic product processing. The grid well is connected to the grease trap 2. The output end of the grease trap 2 is connected to the ion exchange device 5 through the first water pump 12. The output end of the ion exchange device 5 is connected to the multi-media filter 6 and the activated carbon filter 7 through the second water pump 13, and then connected to the reverse osmosis membrane assembly 8. The output end of the reverse osmosis membrane is connected to the degassing tower 9 through the third water pump 14. The output end of the degassing tower 9 is connected to the steam generator 10 through the fourth water pump 15. The steam output end of the steam generator 10 is used to connect to the air inlet channel of the drying environment in the aquatic product processing; the degassing tower 9, the ion exchange device 5 and the steam generator 10 are all connected to the data processor for communication;

[0123] An aeration device is fixed at the bottom of the grease trap 2. The grease trap 2 is provided with a turbidity sensor to obtain oil drop concentration data, a pH sensor to obtain the pH value of the wastewater, and is connected to a flocculant output container;

[0124] An ion concentration sensor is provided in the ion exchanger to obtain target ion concentration data. The ion concentration sensor includes calcium ion Ca 2 + selective electrode and magnesium ion Mg2+ selective electrode;

[0125] The condensate output end of the steam generator 10 is connected to the heat source input end of the steam generator 10 through the fifth water pump 16, and the condensate output end is also connected to the sixth water pump 17, and the sixth water pump 17 is connected to the cleaning mechanism 11 of the reverse osmosis module; the cleaning system includes a water tank, a cleaning agent output device, a cleaning pipeline and a valve. The cleaning agent output device is used to output the membrane cleaning agent to the water tank, and the cleaning pipeline and the valve are connected to the reverse osmosis membrane assembly 8.

[0126] The aeration device, turbidity sensor, pH sensor, flocculant output container, ion concentration sensor, cleaning mechanism 11, first water pump 12, second water pump 13, third water pump 14, fourth water pump 15, fifth water pump 16 and sixth water pump 17 are all communicatively connected to the data processor.

[0127] A movable oil scraper 4 is installed on the top of the grease trap 2 . The oil scraper 4 is communicatively connected with the data processor and is used to scrape off the oil layer on the top of the grease trap 2 .

[0128] A sampling pump 3 is installed at the top edge of the grease trap 2. The sampling pump 3 is communicatively connected to the data processor. The sampling pump 3 includes a driving assembly, a pump body, and a water inlet pipe 22. The water inlet pipe 22 is flexible and a toothed protrusion 221 is provided on the outer surface of the water inlet pipe 22. The driving assembly is used to drive one end of the water inlet pipe 22 to move along the depth direction of the grease trap 2. The other end of the water inlet pipe 22 is connected to the pump body. The pump body is connected to a detection container, and the turbidity sensor is installed in the detection container.

[0129] The driving assembly includes a servo motor 18 and a transmission block 19, both of which are fixed to the ground or a plane. The transmission block 19 has a transmission channel opened in the horizontal direction. The transmission block 19 is rotatably connected to a transmission gear 20 and a driven gear 21. The transmission gear 20 is located above the transmission channel, and the driven gear 21 is located below the transmission channel. The transmission gear 20 is fixed to the output shaft of the servo motor 18, and a water inlet pipe 22 passes through the transmission channel. The toothed protrusions 221 on the outer surface of the water inlet pipe 22 are meshed with the transmission gear 20 and the driven gear 21.

[0130] The implementation principle of the control device for recycling wastewater from aquatic product processing is as follows: the filter grid well 1 filters the large particle residue in the aquatic product processing wastewater and then enters the grease trap 2 for oil-water separation. The data processor controls the servo motor 18 of the sampling pump 3 to obtain wastewater samples of different depths in the grease trap 2 and detects the oil droplet concentration data through the turbidity sensor. When the oil droplet concentration data is greater than the first preset concentration value, the data processor controls the aeration device for aeration, and obtains the pH value of the wastewater through the pH sensor. After adjusting the pH value of the wastewater through the acid-base container, the data processor sends an instruction to control the flocculant output container to add flocculant, and starts the sampling pump 3 at intervals for sampling.

[0131] When the oil drop concentration data is less than the first preset concentration value, the data processor controls the oil scraper 4 to perform the oil skimming operation. After the oil skimming operation is completed, the data processor controls the first water pump 12 to pump the wastewater into the ion exchange device 5. The ion exchange device 5 performs ion exchange to remove calcium ions Ca in the wastewater. 2 + and magnesium ion Mg2+. And through the ion concentration sensor to check, when the ion concentration data is less than the second preset concentration value, the data processor controls the second water pump 13 to pump the wastewater through the multi-media filter 6 and the activated carbon filter 7, and finally enters the reverse osmosis membrane assembly 8 for solubility fixed filtration, and then controls the third water pump 14 to pump the wastewater into the degassing tower 9 for degassing treatment. After the dissolved oxygen and carbon dioxide in the water are detected to meet the standards, the fourth water pump 15 is controlled to pump the wastewater into the steam generator 10. The steam generator 10 heats the wastewater and undergoes steam separation treatment, and transports the dry steam to the drying link of aquatic product processing, and separates the remaining mother liquor to obtain salt crystals, and the condensed water therein is transported back to the heat source input end of the steam generator 10 through the fifth water pump 16 for reheating.

[0132] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A control method for recycling wastewater from aquatic product processing, characterized in that: After the aquatic product processing wastewater is filtered into the grease trap, the oil drop concentration data of the wastewater in the grease trap is obtained. When the oil drop concentration data exceeds a first preset concentration value, a command is sent to start the aeration device in the grease trap; and flocculants are automatically added based on the current pH value of the wastewater in the grease trap; When the oil drop concentration data is less than the first preset concentration value, the first water pump is controlled to pump the wastewater in the oil separator into the ion exchange device, and the target ion concentration data in the wastewater is obtained in real time; when the target ion concentration data is less than the second preset concentration value, the second water pump is controlled to pump the wastewater in the ion exchange device into the reverse osmosis membrane assembly; After controlling the third water pump to transport the waste water from the reverse osmosis membrane assembly to the degassing tower, controlling the fourth water pump to transport the waste water in the degassing tower to the heat source input end of the steam generator; The steam generator is controlled to deliver the dry steam after steam separation to the drying process of aquatic product processing, and the fifth water pump is controlled to pump the condensed water after steam separation back to the heat source input end.

2. A control method for recycling wastewater from aquatic product processing according to claim 1, characterized in that: After the aquatic product processing wastewater is filtered into the grease trap, oil droplet concentration data of the wastewater in the grease trap is obtained, and when the oil droplet concentration data exceeds a first preset concentration value, an instruction is sent to start an aeration device in the grease trap; And automatically add flocculants based on the current pH value of wastewater in the grease trap; including: After the aquatic product processing wastewater is filtered into the grease trap, a start command is sent to the sampling pump to drive the water inlet pipe of the sampling pump to move vertically along the grease trap, and wastewater samples are collected at intervals during the movement. The wastewater samples collected at intervals are all sent to the detection container, and a start instruction is sent to the turbidity sensor in the detection container to obtain oil drop concentration data; When the oil drop concentration data exceeds a first preset concentration value, starting an aeration device in the grease trap and obtaining a pH value of wastewater in the current grease trap; When the pH value is within a preset range, a start instruction is sent to the flocculant output container to add a preset amount of flocculant to the grease trap; Send start instructions to the sampling pump at intervals.

3. A control method for recycling wastewater from aquatic product processing according to claim 1, characterized in that: The step of controlling the first water pump to pump the waste water in the grease trap into the ion exchange device when the oil drop concentration data is less than the first preset concentration value; include: When the oil drop concentration data is less than the first preset concentration value, obtaining the oil layer thickness data at the top of the wastewater in the grease trap; Adjust the movement parameters of the oil scraper based on the oil layer thickness data; Generate a start command based on the movement parameters and send it to the oil scraper; When the oil scraper completes the oil skimming operation, the first water pump is controlled to pump the waste water in the grease trap into the ion exchange device.

4. A control method for recycling wastewater from aquatic product processing according to claim 1, characterized in that: The target ion concentration data includes calcium ion Ca 2 + concentration data and magnesium ion Mg2+ concentration data; when the target ion concentration data is less than the second preset concentration value, controlling the second water pump to pump the wastewater in the ion exchange device into the reverse osmosis membrane assembly; comprising: When the target ion concentration data is less than the second preset concentration value, the pH value of the current wastewater is obtained, and the pH value of the wastewater is adjusted to within a preset range; A pressure detection instruction is sent to the second water pump to obtain the pressure parameter of the second water pump. When the pressure parameter is within the preset pressure range, a start instruction is sent to the second water pump. After receiving the start instruction, the second water pump transports the wastewater in the ion exchange device through the multi-media filter and the activated carbon filter, and then pumps it into the reverse osmosis membrane assembly.

5. A control method for recycling wastewater from aquatic product processing according to claim 1, characterized in that: After controlling the third water pump to transport the waste water from the reverse osmosis membrane assembly to the degassing tower, controlling the fourth water pump to transport the waste water in the degassing tower to the heat source input end of the steam generator; comprising: Control the third water pump to transport the wastewater from the reverse osmosis membrane assembly to the degassing tower for degassing treatment, and determine whether the dissolved oxygen concentration data and dissolved carbon dioxide concentration data of the wastewater in the degassing tower meet the standards; If the standard is met, the fourth water pump is controlled to transport the waste water in the degassing tower to the heat source input end of the steam generator.

6. A control method for recycling wastewater from aquatic product processing according to claim 1, characterized in that: The control of the steam generator to deliver the dry steam after steam separation to the drying link of aquatic product processing, and the control of the fifth water pump to pump the condensed water after steam separation back to the heat source input end include: Control the steam generator to heat the degassed wastewater to generate steam, and obtain dry steam after steam separation treatment, and then transport the dry steam to the drying stage of aquatic product processing; The concentrated liquid produced after the wastewater is heated and evaporated is transported to the crystallizer, and the salt crystals are separated from the mother liquor by centrifugal separation; The volume data of the condensed water in the condensed water container after the steam separation treatment is monitored, and when the volume data is greater than a preset volume value, the fifth water pump is controlled to pump the condensed water back to the heat source input end.

7. A control method for recycling wastewater from aquatic product processing according to claim 6, characterized in that: After the step of controlling the fifth water pump to pump the condensed water back to the heat source input end, the method further includes: When the steam generator is not in working state, the working index of the reverse osmosis membrane assembly is obtained, and the working index includes flux data, salt permeability data and pressure difference data; When the working index is not up to standard, determine whether there is any remaining condensed water in the condensed water container; If yes, the condensate is pumped back to the cleaning mechanism of the reverse osmosis membrane assembly through the sixth water pump; When the liquid level in the water tank of the cleaning mechanism reaches a preset height, a start instruction is sent to the cleaning agent output device of the cleaning mechanism; The cleaning agent output device outputs a preset amount of membrane cleaning agent to the water tank for mixing; A start command is sent to the cleaning mechanism to clean the reverse osmosis membrane assembly.

8. A control device for recycling wastewater from aquatic product processing, characterized in that: It includes a filter grid well, a grease trap, an ion exchange device, a reverse osmosis membrane assembly, a degassing tower, a steam generator and a data processor. The filter grid well is used to fill the wastewater from aquatic product processing, the grid well is connected to the grease trap, the grease trap is connected to the ion exchange device through the first water pump, the output end of the ion exchange device is connected to the reverse osmosis membrane assembly through the second water pump, the output end of the reverse osmosis membrane is connected to the degassing tower through the third water pump, the output end of the degassing tower is connected to the steam generator through the fourth water pump, and the steam output end of the steam generator is used to connect to the air inlet channel of the drying environment in the aquatic product processing; the degassing tower, the ion exchange device and the steam generator are all in communication connection with the data processor; An aeration device is fixed at the bottom of the grease trap, the grease trap is provided with a turbidity sensor to obtain oil drop concentration data, a pH sensor to obtain the pH value of wastewater, and is connected to a flocculant output container; The ion exchanger is provided with an ion concentration sensor to obtain target ion concentration data; The condensate output end of the steam generator is connected to the heat source input end of the steam generator through a fifth water pump; The aeration device, turbidity sensor, pH sensor, flocculant output container, ion concentration sensor, first water pump, second water pump, third water pump, fourth water pump and fifth water pump are all connected to the data processor for communication.

9. A control device for recycling wastewater from aquatic product processing according to claim 8, characterized in that: A sampling pump is installed on the top of the grease trap, and the sampling pump is communicatively connected to the data processor. The sampling pump includes a driving assembly, a pump body, and a water inlet pipe. The water inlet pipe is flexible. The driving assembly is used to drive one end of the water inlet pipe to move along the depth direction of the grease trap, and the other end of the water inlet pipe is connected to the pump body. The pump body is connected to a detection container, and the turbidity sensor is installed in the detection container.

10. A control device for recycling wastewater from aquatic product processing according to claim 9, characterized in that: The driving assembly includes a servo motor and a transmission block, both of which are fixed to the ground or a plane. The transmission block is provided with a transmission channel, and the transmission block is rotatably connected to a transmission gear and a driven gear. The transmission gear is located above the transmission channel, and the driven gear is located below the transmission channel. The transmission gear is fixed to the output shaft of the servo motor, and the water inlet pipe passes through the transmission channel. The outer surface of the water inlet pipe is provided with a toothed protrusion, and the toothed protrusion is meshed with the transmission gear and the driven gear.

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