A system for treating and recycling wastewater in a pretreatment section for preparing phosphorus shrimp peptide from defatted phosphorus shrimp powder

Abstract

The utility model relates to sewage treatment technical field, concretely relates to a kind of degreasing phosphor shrimp powder preparation phosphor shrimp peptide pretreatment section sewage treatment and recycling system, including sewage treatment unit, sewage recycling unit and the resin regeneration unit being interconnected with sewage treatment unit.The utility model reduces the tap water consumption by the third cleaning wastewater with low salt content and pollutant concentration in degreasing phosphor shrimp powder cleaning process is recycled and used for first cleaning;By mixing the first and second cleaning wastewater of degreasing phosphor shrimp powder preparation phosphor shrimp peptide pretreatment section to carry out sewage treatment, the treatment pressure of sewage treatment unit is reduced, and the risk of exceeding standard discharge is reduced;Sewage recycling process is also simplified by recycling water reuse, and use cost is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a wastewater treatment and recycling system for the pretreatment stage of degreased krill powder preparation of krill peptides. Background Technology

[0002] Krill peptides possess various biological activities and functions, including lowering blood pressure, regulating blood sugar, anti-oxidation, anti-tumor effects, and enhancing immunity. They have been widely used in pharmaceuticals, functional foods, cosmetics, and other industries, and are currently mainly obtained through enzymatic hydrolysis. However, enzymatic hydrolysis easily leads to the accumulation of salt and ash during the process, requiring multiple washes with large amounts of clean water in the pretreatment stage. The washing wastewater contains high concentrations of pollutants such as COD, BOD, ammonia nitrogen, total nitrogen, and total phosphorus. This not only puts enormous pressure on wastewater treatment systems but also increases production costs and environmental risks, becoming a key bottleneck restricting the green and sustainable development of this industry. As a country with scarce water resources, my country must strictly control excessive wastewater discharge and promote wastewater recycling. Therefore, a specialized wastewater treatment system that can effectively conserve water resources and reduce operating costs is needed. Utility Model Content

[0003] The purpose of this invention is to provide a wastewater treatment and recycling system for the pretreatment stage of degreased krill powder preparation of krill peptides. This system can ensure that the wastewater discharge from the pretreatment stage of degreased krill powder preparation of krill peptides meets the standards continuously and stably, and can also reduce tap water consumption, save water resources, and reduce operating costs.

[0004] The solution adopted by this utility model to achieve the purpose is: a wastewater treatment and recycling system for the pretreatment section of degreased krill powder to prepare krill peptides, including a wastewater treatment unit, a wastewater regeneration unit, and a degreased krill powder washing tank connected to the wastewater treatment unit and the wastewater regeneration unit respectively. The wastewater treatment unit comprises, in sequence, a wastewater equalization tank, a wastewater air flotation integrated unit, a wastewater composite anaerobic baffled reactor, a wastewater anoxic tank, a wastewater aerobic tank, a wastewater secondary sedimentation tank, a wastewater coagulation sedimentation tank, a wastewater CUF (powdered activated carbon membrane bioreactor) tank, a wastewater production tank, a wastewater rapid denitrification tank, and a wastewater disinfection tank; the inlet of the wastewater equalization tank is connected to the outlet of the defatted krill powder washing tank; the effluent from the wastewater disinfection tank meets discharge standards. The wastewater reclamation unit includes a reclaimed water equalization tank, a reclaimed water biological tank, a reclaimed water secondary sedimentation tank, a reclaimed water coagulation sedimentation tank, and a reclaimed water reuse tank connected in sequence. The inlet of the reclaimed water equalization tank is connected to the outlet of the defatted krill powder washing tank, and the outlet of the reclaimed water reuse tank is connected to the inlet of the defatted krill powder washing tank.

[0005] Preferably, the wastewater flotation integrated tank, the wastewater coagulation sedimentation tank, and the reclaimed water coagulation sedimentation tank are also connected to the PAC / PAM dosing room.

[0006] Preferably, the wastewater CUF tank is connected to the activated carbon dosing station.

[0007] Preferably, the wastewater rapid denitrification tank is also connected to a resin regeneration unit, including a wastewater regenerator tank, a wastewater regenerated liquid collection tank, a wastewater denitrification tank, and a wastewater denitrification MBR (membrane bioreactor) tank.

[0008] Preferably, the outlet of the wastewater regeneration agent tank is connected to the wastewater rapid denitrification tank, the wastewater rapid denitrification tank is connected to the inlet of the wastewater regenerated liquid collection tank, the outlet of the wastewater regenerated liquid collection tank is connected to the inlet of the wastewater denitrification tank, and the outlet of the wastewater denitrification tank is connected to the inlet of the wastewater denitrification MBR tank.

[0009] Preferably, the wastewater denitrification tank, the wastewater denitrification MBR tank, and the sludge tank are connected.

[0010] Preferably, the outlet of the wastewater denitrification MBR tank is connected to the inlet of the wastewater equalization tank.

[0011] Preferably, the wastewater flotation integrated tank, the wastewater composite anaerobic baffled reactor, the wastewater secondary sedimentation tank, the wastewater coagulation sedimentation tank, the reclaimed water regulating tank, the reclaimed water secondary sedimentation tank, the reclaimed water coagulation sedimentation tank, and the sludge tank are connected.

[0012] Preferably, the wastewater disinfection tank and the reclaimed water reuse tank are connected to the disinfection tank.

[0013] Preferably, the reclaimed water biological tank includes an aeration system to control the oxygen content in the reclaimed water biological tank.

[0014] Compared with the prior art, the present invention has the following advantages: This invention connects the outlet of the reclaimed water reuse tank with the inlet of the defatted krill powder washing tank, thus realizing a technical solution to regenerate the third washing wastewater with low salt content and pollutant concentration during the defatted krill powder washing process and reuse it for the first washing. This reduces the amount of tap water used and effectively lowers the operating cost.

[0015] The wastewater regeneration unit of this invention does not require a desalination treatment device, enabling the direct reuse of low-COD reclaimed water without desalination. Compared with traditional wastewater reuse and regeneration unit systems such as membrane separation desalination, it is simpler, more stable, and has lower treatment costs.

[0016] This invention connects the outlet of the defatted krill powder washing tank with the inlet of the wastewater regulating tank, thereby achieving uniform mixing of wastewater from different washing batches with significantly different pollutant concentrations during the defatted krill powder washing process for wastewater treatment. This reduces the pollution index of the wastewater entering the wastewater treatment unit, alleviates the treatment pressure on the wastewater treatment unit, and reduces the risk of exceeding emission standards. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the wastewater treatment and recycling system for the pretreatment stage of defatted krill powder to prepare krill peptides provided by this utility model; Figure 2 This is a process flow diagram of Embodiment 1 of this utility model; Figure 3 This is a process flow diagram of Comparative Example 1 of this utility model; Figure 4 This is a process flow diagram of Comparative Example 2 of this utility model; In the diagram, 1. Degreased krill powder washing tank; 2. Wastewater equalization tank; 3. Wastewater air flotation integrated machine tank; 4. Wastewater composite anaerobic baffled reactor; 5. Wastewater anoxic tank; 6. Wastewater aerobic tank; 7. Wastewater secondary sedimentation tank; 8. Wastewater coagulation sedimentation tank; 9. Wastewater CUF tank; 10. Wastewater permeate tank; 11. Wastewater rapid denitrification tank; 12. Wastewater disinfection tank; 13. Reclaimed water equalization tank; 14. Reclaimed water biological tank; 15. Reclaimed water secondary sedimentation tank; 6. Reclaimed water coagulation sedimentation tank; 17. Reclaimed water reuse tank; 18. Wastewater regeneration agent tank; 19. Wastewater regenerated liquid collection tank; 20. Wastewater denitrification tank; 21. Wastewater denitrification MBR tank; 22. PAC / PAM dosing room; 23. Activated carbon dosing room; 24. Disinfection tank; 25. Sludge tank; 26. Sludge dewatering room; 27. Effluent pipe; 28. Resin regenerated liquid effluent pipe; 29. ​​Reclaimed water pipeline; 30. Sludge pipeline. Detailed Implementation

[0018] To better understand this utility model, the following embodiments are further illustrations of this utility model, but the content of this utility model is not limited to the following embodiments.

[0019] Example 1 like Figure 1 As shown, this utility model embodiment provides a wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides, including a wastewater treatment unit and a wastewater recycling unit that are respectively connected to the defatted krill powder washing tank 1 through pipelines; The wastewater treatment unit comprises, in sequence via pipelines, a wastewater equalization tank 2, a wastewater air flotation integrated unit 3, a wastewater composite anaerobic baffled reactor 4, a wastewater anoxic tank 5, a wastewater aerobic tank 6, a wastewater secondary sedimentation tank 7, a wastewater coagulation sedimentation tank 8, a wastewater CUF tank 9, a wastewater permeate tank 10, a wastewater rapid denitrification tank 11, and a wastewater disinfection tank 12. The inlet of the wastewater equalization tank 2 is connected to the outlet of the defatted krill powder washing tank 1. The wastewater air flotation integrated unit 3 and the wastewater coagulation sedimentation tank 8 are respectively connected to the PAC / PAM dosing room 22. The wastewater CUF tank 9 is connected to the activated carbon dosing room 23. The wastewater disinfection tank 12 is connected to the disinfection tank 24. The wastewater air flotation integrated unit 3, the wastewater composite anaerobic baffled reactor 4, the wastewater secondary sedimentation tank 7, and the wastewater coagulation sedimentation tank 8 are respectively connected to the sludge tank 25 via sludge pipeline 30. The wastewater disinfection tank 12 discharges compliant effluent through the outlet pipe 27.

[0020] The wastewater rapid denitrification tank 11 is also connected to the resin regeneration unit, which includes a wastewater regeneration agent tank 18, a wastewater rapid denitrification tank 11, a wastewater regenerated liquid collection tank 19, a wastewater denitrification tank 20, and a wastewater denitrification MBR tank 21, which are connected in sequence through pipelines. The wastewater denitrification tank 20 and the wastewater denitrification MBR tank 21 are respectively connected to the sludge tank 25 through the sludge pipeline 30. The wastewater denitrification MBR tank 21 also discharges qualified effluent through the resin regenerated liquid outlet pipe 28.

[0021] The wastewater reclamation unit includes a reclaimed water equalization tank 13, a reclaimed water biological tank 14, a reclaimed water secondary sedimentation tank 15, a reclaimed water coagulation sedimentation tank 16, and a reclaimed water reuse tank 17, which are connected sequentially by pipelines. The inlet of the reclaimed water equalization tank 13 is connected to the outlet of the defatted krill powder washing tank 1. The reclaimed water coagulation sedimentation tank 16 is connected to the PAC / PAM dosing room 22. The reclaimed water reuse tank 17 is connected to the disinfection tank 24. The reclaimed water equalization tank 13, the reclaimed water secondary sedimentation tank 15, and the reclaimed water coagulation sedimentation tank 16 are connected to the sludge tank 25 through sludge pipeline 30. The reclaimed water reuse tank 17 is connected to the inlet of the defatted krill powder washing tank 1 through reclaimed water pipeline 29, so that the reclaimed water can be reused. The sludge tank 25 is connected to the sludge dewatering room 26, and the dewatered sludge is transported off-site.

[0022] Process flow description: like Figure 2As shown, the first and second washing wastewater from the pretreatment stage of degreased krill powder preparation for krill peptides enters the wastewater equalization tank 2 through pipelines from the degreased krill powder washing tank 1. In the equalization tank 2, the water quality is stirred and the flow rate is adjusted before the wastewater is quantitatively transported to the integrated wastewater flotation tank 3. In the integrated wastewater flotation tank 3, PAC and PAM are added to remove grease and suspended solids from the wastewater, while simultaneously reducing COD, BOD, and ammonia nitrogen. After separating the sludge and water, the sludge is fed into the sludge tank 25, and the wastewater is sequentially fed into the wastewater composite anaerobic baffled reactor 4, the wastewater anoxic tank 5, and the wastewater aerobic tank 6 for nitrogen and phosphorus removal using the A2O process (anaerobic-anoxic-aerobic method). The wastewater treated by the A2O process is sequentially fed into the secondary sedimentation tank 7 to separate the sludge and water. PAC and PAM are added to the wastewater coagulation sedimentation tank 8 to allow the difficult-to-settle particles in the wastewater to aggregate and settle, resulting in further separation of sludge and water. Wastewater from the coagulation and sedimentation tank 8 is fed into the wastewater CUF tank 9. Regenerated powdered activated carbon is added to the membrane tank to effectively adsorb recalcitrant organic pollutants, further reducing COD and color content. After the saturated powdered activated carbon is separated and adsorbed in the wastewater CUF tank 9 using a submerged ultrafiltration membrane, the effluent is fed into the wastewater production tank 10 to balance the water quality and ensure the stability of the effluent. Then, it is fed into the wastewater rapid-acting denitrification tank 11 to remove nitrate ions and total nitrogen through ion exchange adsorption. Finally, the effluent is fed into the wastewater disinfection tank 12 for disinfection before being discharged in compliance with standards.

[0023] The resin regenerator is introduced from the wastewater regenerator tank 18 into the wastewater rapid denitrification tank 11. After backwashing, countercurrent regeneration, clear water replacement, and forward rinsing, the macroporous resin regains its adsorption capacity for nitrates, thus enabling its recycling. The wastewater rapid denitrification tank 11 is located at the top of the wastewater regenerated liquid collection tank 19. The regenerated wastewater and rinsing water flow into the wastewater regenerated liquid collection tank 19 below to balance the water quality and adjust the water volume before being introduced into the wastewater denitrification tank 20. In the wastewater denitrification tank 20, a carbon source is added to efficiently remove nitrates, reducing total nitrogen to below 10 mg / L. The denitrified regenerated wastewater is flexibly controlled according to water quality conditions. It can be discharged into the clear water tank and then mixed in the pipeline to meet the discharge standards, or it can be returned to the wastewater equalization tank 2. Preferably, the effluent is introduced into the wastewater denitrification MBR tank 21 to achieve deep purification of the wastewater before discharge to meet the standards.

[0024] Using the system of this embodiment, the third cleaning wastewater from the pretreatment stage of defatted krill powder preparation for krill peptide production enters the reclaimed water equalization tank 13 through pipeline from the defatted krill powder cleaning tank 1. After the water quality is balanced and the water volume is adjusted, the wastewater is quantitatively transported to the reclaimed water biological tank 14. The reclaimed water biological tank 14 has an aeration system. After removing pollutants from the wastewater by alternating anaerobic (3h), anoxic (5h), and aerobic (16h) cycles, the wastewater is sequentially fed into the reclaimed water secondary sedimentation tank 15 and the reclaimed water coagulation sedimentation tank 16 to separate sludge and water. The reclaimed water in the reclaimed water coagulation sedimentation tank 16 is then disinfected by passing it into the reclaimed water reuse tank 17. The reclaimed water can then be returned to the defatted krill powder cleaning tank 1 as the first cleaning water for the pretreatment stage of defatted krill powder preparation for krill peptide production.

[0025] Comparative Example 1 The difference between this comparative example and Example 1 is that the wastewater treatment and reuse system for the pretreatment stage of defatted krill powder to krill peptide preparation only includes a wastewater treatment unit. The wastewater from the first to third washing stages of the defatted krill powder to krill peptide pretreatment stage all uses tap water and is piped from the defatted krill powder washing tank 1 into the wastewater equalization tank 2 within the wastewater treatment unit for treatment. The process flow diagram of the system using this comparative example is as follows: Figure 3 As shown.

[0026] Comparative Example 2 The difference between this comparative example and Example 1 is that the wastewater treatment and reuse system for the pretreatment stage of degreased krill powder to krill peptide preparation includes a wastewater treatment unit and a wastewater regeneration unit. The first washing wastewater from the pretreatment stage of degreased krill powder to krill peptide preparation directly enters the wastewater treatment unit. The second washing wastewater from the pretreatment stage of degreased krill powder to krill peptide preparation enters wastewater regeneration unit 1, where the regenerated freshwater is used for the first washing, and the concentrated water enters the wastewater treatment unit. The third washing wastewater from the pretreatment stage of degreased krill powder to krill peptide preparation enters wastewater regeneration unit 2, and after regeneration, is used for the second washing. The process flow diagram of this comparative example is shown below. Figure 4 As shown.

[0027] Because the influent water quality of the wastewater regeneration unit 1 is highly polluted, a regenerated water CUF tank and a regenerated water RO tank are added after the regenerated water coagulation sedimentation tank 16. The water phase in the regenerated water coagulation sedimentation tank 16 is sequentially passed into the regenerated water CUF tank to add regenerated powdered activated carbon, which effectively adsorbs recalcitrant organic pollutants and further reduces COD and color content. The regenerated water RO tank removes colloids, organic matter and dissolved salts from the water through a reverse osmosis membrane. The water is then passed into the regenerated water reuse tank 17 for reuse.

[0028] Table 1. Comparison of various items between Example 1, Comparative Example 1, and Comparative Example 2.

[0029] As can be seen from the comparison items and data in Table 1, the influent water quality indicators of the wastewater treatment plant in Example 1 are relatively high, the risk of exceeding discharge standards is relatively low, the reclaimed water reuse process is simple, and the operating cost is low. In contrast, the influent water quality indicators of the wastewater treatment plant in Comparative Example 1 are relatively low, the risk of exceeding discharge standards is low, there is no reclaimed water reuse, and the operating cost is relatively high. In contrast, the influent water quality indicators of the wastewater treatment plant in Comparative Example 2 are high, the risk of exceeding standards is high, the process is complex, the plant occupies a large area, and the operating cost is high. This invention reduces the consumption of tap water and effectively lowers the operating cost by regenerating the third cleaning wastewater (which has lower salt content and pollutant concentration) from the degreased krill powder washing process and reusing it for the first cleaning. Furthermore, by mixing the first and second cleaning wastewater, the water quality indicators of the influent to the wastewater treatment unit are reduced, resulting in a relatively low risk of exceeding discharge standards.

[0030] The above description is merely a preferred embodiment of the present utility model, and should not be construed as limiting the scope of the present utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present utility model, and these improvements and modifications are also considered to be within the scope of protection of the present utility model.

Claims

1. A wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides, characterized in that, include: Wastewater treatment unit, wastewater regeneration unit, and degreased krill powder washing tanks connected to the wastewater treatment unit and wastewater regeneration unit respectively; The wastewater treatment unit includes, in sequence, a wastewater equalization tank, a wastewater air flotation integrated unit, a wastewater composite anaerobic baffled reactor, a wastewater anoxic tank, a wastewater aerobic tank, a wastewater secondary sedimentation tank, a wastewater coagulation sedimentation tank, a wastewater CUF tank, a wastewater product tank, a wastewater rapid denitrification tank, and a wastewater disinfection tank; the inlet of the wastewater equalization tank is connected to the outlet of the defatted krill powder washing tank; the effluent from the wastewater disinfection tank meets the discharge standards. The wastewater regeneration unit includes a reclaimed water regulating tank, a reclaimed water biological tank, a reclaimed water secondary sedimentation tank, a reclaimed water coagulation sedimentation tank, and a reclaimed water reuse tank connected in sequence; the inlet of the reclaimed water regulating tank is connected to the outlet of the defatted krill powder washing tank, and the outlet of the reclaimed water reuse tank is connected to the inlet of the defatted krill powder washing tank.

2. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 1, characterized in that, The wastewater flotation integrated tank, wastewater coagulation sedimentation tank, and reclaimed water coagulation sedimentation tank are also connected to the PAC / PAM dosing room.

3. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 1, characterized in that, The wastewater CUF tank is connected to the activated carbon dosing room.

4. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 1, characterized in that, The wastewater rapid denitrification tank is also connected to a resin regeneration unit, which includes a wastewater regeneration agent tank, a wastewater regeneration liquid collection tank, a wastewater denitrification tank, and a wastewater denitrification MBR tank.

5. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 4, characterized in that, The outlet of the wastewater regeneration tank is connected to the wastewater rapid denitrification tank, the wastewater rapid denitrification tank is connected to the inlet of the wastewater regenerated liquid collection tank, the outlet of the wastewater regenerated liquid collection tank is connected to the inlet of the wastewater denitrification tank, and the outlet of the wastewater denitrification tank is connected to the inlet of the wastewater denitrification MBR tank.

6. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 4, characterized in that, The wastewater denitrification tank, the wastewater denitrification MBR tank, and the sludge tank are connected.

7. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 4, characterized in that, The effluent from the wastewater denitrification MBR tank meets the discharge standards.

8. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 1, characterized in that, The wastewater flotation integrated tank, wastewater composite anaerobic baffled reactor, wastewater secondary sedimentation tank, wastewater coagulation sedimentation tank, reclaimed water regulating tank, reclaimed water secondary sedimentation tank, reclaimed water coagulation sedimentation tank, and sludge tank are connected.

9. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 1, characterized in that, The wastewater disinfection tank and the reclaimed water reuse tank are connected to the disinfection tank.

10. The wastewater treatment and recycling system for the pretreatment stage of defatted krill powder preparation of krill peptides according to claim 1, characterized in that, The reclaimed water biological tank includes an aeration system to control the oxygen content in the reclaimed water biological tank.

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