Advanced treatment system for manual soy sauce fermentation sewage

Abstract

The invention discloses an advanced treatment system for manual soy sauce fermentation sewage, and relates to the technical field of sewage treatment.The system aims at the characteristics that the manual soy sauce fermentation sewage is high in organic matter concentration and complex in component, contains a large amount of fermentation residues and the like. The efficient deep treatment on the sewage is realized. The pretreatment module is used for removing large-particle impurities and part of suspended substances in the sewage, so that a foundation is laid for subsequent treatment; the biochemical treatment module is used for degrading organic matters in the sewage by utilizing the metabolism of microorganisms; the deep purification module is used for further removing residual pollutants to ensure that the effluent quality reaches the standard; and the sludge treatment module is used for reducing, stabilizing and harmlessly treating the sludge generated in the treatment process. The system has the beneficial effects that the system is high in treatment efficiency, good in effluent quality and stable in operation, can effectively solve the problem of manual soy sauce fermentation sewage treatment, and has a good application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a manual soy sauce fermentation sewage deep treatment system. Background Art

[0002] Handmade soy sauce is beloved by consumers for its unique flavor and traditional production process. However, the fermentation process produces a significant amount of wastewater. This wastewater, containing high concentrations of organic matter, proteins, amino acids, salts, and fermentation residues, is complex and, if discharged directly, would cause significant environmental pollution.

[0003] Currently, treatment methods for handmade soy sauce fermentation wastewater have several shortcomings. Traditional biochemical treatment methods have limited efficiency in degrading high-concentration organic matter and struggle to remove some stubborn pollutants in the wastewater. Physical and chemical treatment methods are costly and offer inconsistent results. Therefore, developing an efficient, stable, and economical deep treatment system for handmade soy sauce fermentation wastewater is of great practical significance. Existing sand settling devices are prone to transferring sand to the next process, and existing rotary screens require the installation of filter screens as needed after treatment. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a manual soy sauce fermentation wastewater deep treatment system with high system treatment efficiency, good effluent water quality and stable operation, and effectively solve the problem of manual soy sauce fermentation wastewater treatment, and have good application prospects.

[0005] The object of the present invention is achieved through the following technical scheme: A manual soy sauce fermentation wastewater deep treatment system comprises a pretreatment module, a biochemical treatment module, a deep purification module and a sludge treatment module connected in sequence.

[0006] Preferably, the pretreatment module includes a screen device, a grit chamber and an adjusting tank. The screen device adopts a rotary screen with a screen gap of 5-10mm. Its function is to remove large particles of suspended matter and floating objects in the sewage to prevent subsequent equipment from being blocked. The outlet end of the screen device is connected to the water inlet end of the grit chamber. The grit chamber is a cyclone grit chamber. A stirring device is provided in the tank with a stirring speed of 10-20r / min. The sand particles in the sewage can be separated by centrifugal force to reduce the wear of the sand particles on the subsequent treatment equipment. The outlet end of the grit chamber is connected to the water inlet end of the adjusting tank. An aeration device and a pH adjustment device are provided in the adjusting tank. The aeration volume of the aeration device is 0.5-1.0m³ / (h・m³). Aeration can prevent the precipitation of suspended matter in the sewage, and at the same time play the role of pre-aeration and regulating water quality. The pH adjustment device can adjust the pH value of the sewage to 6-8, creating a suitable pH environment for subsequent biochemical treatment.

[0007] Preferably, the biochemical treatment module includes an anaerobic reaction tank, an anoxic reaction tank and an aerobic reaction tank. The water inlet of the anaerobic reaction tank is connected to the water outlet of the regulating tank. A three-phase separator and a stirring device are provided in the tank. The reaction temperature is controlled at 30-35°C, and the hydraulic retention time is 24-48h. Under anaerobic conditions, microorganisms decompose the macromolecular organic matter in the sewage into small molecular organic matter, while producing gases such as methane. The three-phase separator can separate the gas, liquid and sludge. The water outlet of the anaerobic reaction tank is connected to the water inlet of the anoxic reaction tank. A stirring device is provided in the anoxic reaction tank. The hydraulic retention time is 8-12h, and the dissolved oxygen concentration is controlled below 0.5mg / L. Under anoxic conditions, denitrifying bacteria convert nitrate nitrogen into nitrogen gas to achieve denitrification. The outlet of the anoxic reaction tank is connected to the inlet of the aerobic reaction tank. The aerobic reaction tank is equipped with an aerator and biological filler. The fill rate of the biological filler is 30-50%. The aeration capacity of the aerator is sufficient to maintain the dissolved oxygen concentration in the tank at 2-4 mg / L, and the hydraulic retention time is 16-24 hours. Aerobic microorganisms attach to the biological filler and feed on organic matter in the sewage, breaking it down into inorganic substances such as carbon dioxide and water. Simultaneously, they undergo nitrification, converting ammonia nitrogen into nitrate nitrogen.

[0008] Preferably, the deep purification module includes a sedimentation tank, a filtration device and a disinfection device. The water inlet of the sedimentation tank is connected to the water outlet of the aerobic reaction tank, which is used to precipitate the suspended sludge in the sewage so that the sewage is preliminarily purified. The water outlet of the sedimentation tank is connected to the water inlet of the filtration device. The filtration device adopts an activated carbon filter. The filling height of the activated carbon is 1-1.5m, and the filtration speed is 5-10m / h. The activated carbon has a developed pore structure and can absorb residual organic matter, color and odor in the sewage. The water outlet of the filtration device is connected to the water inlet of the disinfection device. The disinfection device adopts an ultraviolet sterilizer with an ultraviolet dose of 15-30mJ / cm², which can kill bacteria, viruses and other microorganisms in the sewage to ensure the safety of the effluent water quality.

[0009] Preferably, the sludge treatment module includes a sludge thickening tank, a sludge dewatering machine and a sludge drying device. The water inlet of the sludge thickening tank is respectively connected to the sludge outlets of the grit chamber, the regulating tank, the anaerobic reaction tank, the anoxic reaction tank, the aerobic reaction tank and the sedimentation tank, and is used to concentrate the sludge generated by each treatment unit and reduce the sludge volume. The water outlet of the sludge thickening tank is connected to the water inlet of the sludge dewatering machine. The sludge dewatering machine adopts a plate and frame filter press, which can further dehydrate the concentrated sludge and reduce the sludge moisture content to 60-70%. The water outlet of the sludge dewatering machine is connected to the water inlet of the sludge drying device. The sludge drying device adopts a hot air dryer with a drying temperature of 60-80°C. The dehydrated sludge is dried to a moisture content of less than 30%, which is convenient for the transportation, storage and subsequent disposal of the sludge, such as landfill, incineration or resource utilization.

[0010] The present invention has the following advantages: 1. The water inlet of the sludge thickening tank of the present invention is respectively connected to the sludge outlets of the grit chamber, regulating tank, anaerobic reaction tank, anoxic reaction tank, aerobic reaction tank and sedimentation tank, and is used to concentrate the sludge generated by each treatment unit and reduce the sludge volume. The water outlet of the sludge thickening tank is connected to the water inlet of the sludge dewatering machine. The sludge dewatering machine adopts a plate and frame filter press, which can further dehydrate the concentrated sludge and reduce the sludge moisture content to 60-70%. The water outlet of the sludge dewatering machine is connected to the water inlet of the sludge drying device. The sludge drying device adopts a hot air dryer with a drying temperature of 60-80°C. The dehydrated sludge is dried to a moisture content of less than 30%, which is convenient for the transportation, storage and subsequent disposal of the sludge, such as landfill, incineration or resource utilization.

[0011] 2. The water inlet of the sedimentation tank of the present invention is connected to the water outlet of the aerobic reaction tank, which is used to precipitate suspended sludge in the sewage, thereby providing preliminary purification of the sewage. The water outlet of the sedimentation tank is connected to the water inlet of the filtration device, which uses an activated carbon filter. The activated carbon has a filling height of 1-1.5m and a filtration speed of 5-10m / h. The activated carbon has a developed pore structure and can absorb residual organic matter, color, and odor in the sewage. The water outlet of the filtration device is connected to the water inlet of the disinfection device. The disinfection device uses an ultraviolet sterilizer with an ultraviolet dose of 15-30mJ / cm², which can kill bacteria, viruses and other microorganisms in the sewage, ensuring the safety of the effluent water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic structural diagram of the present invention; Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle; Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle.

[0013] In the figure, there are a screen device 1, a grit chamber 2, an adjusting chamber 3, a rotary screen 4, an anaerobic reaction tank 5, an anoxic reaction tank 6, an aerobic reaction tank 7, a first-stage table 8, a second-stage table 9, a discharge pipe 10, a conical bottom plate 11, a discharge pipe 12, and a grit screen 13. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings, and the protection scope of the present invention is not limited to the following: like Figures 1 to 3 As shown, a manual soy sauce fermentation wastewater deep treatment system includes a pretreatment module 1, a biochemical treatment module, a deep purification module and a sludge treatment module connected in sequence.

[0015] In this embodiment, the pretreatment module includes a screen assembly 1, a grit chamber 2, and an adjustment tank 3. Screen assembly 1 utilizes a rotary screen 4 with a screen gap of 5-10 mm. Its function is to remove large suspended matter and floating debris from the wastewater, preventing clogging of subsequent equipment. The outlet of screen assembly 1 is connected to the inlet of grit chamber 2, a cyclonic grit chamber equipped with a stirring device at a stirring speed of 10-20 rpm. This device separates sand particles from the wastewater through centrifugal force, reducing wear on subsequent treatment equipment. The outlet of grit chamber 2 is connected to the inlet of adjustment tank 2, which is equipped with an aeration device and a pH adjustment device. The aeration device has an aeration rate of 0.5-1.0 m³ / (h·m³). This prevents the sedimentation of suspended matter in the wastewater, while also providing pre-aeration and regulating water quality. The pH adjustment device can adjust the pH value of the wastewater to 6-8, creating a suitable pH environment for subsequent biochemical treatment.

[0016] In this embodiment, the biochemical treatment module includes an anaerobic reaction tank 5, an anoxic reaction tank 6 and an aerobic reaction tank 7. The water inlet of the anaerobic reaction tank 5 is connected to the water outlet of the regulating tank 2. A three-phase separator and a stirring device are provided in the tank. The three-phase separator and the stirring device are both existing technologies. The reaction temperature is controlled at 30-35°C, and the hydraulic retention time is 24-48h. Under anaerobic conditions, microorganisms decompose the macromolecular organic matter in the sewage into small molecular organic matter, and at the same time produce gases such as methane. The three-phase separator can separate the gas, liquid and sludge. The water outlet of the anaerobic reaction tank 5 is connected to the water inlet of the anoxic reaction tank 6. A stirring device is provided in the anoxic reaction tank 6. The hydraulic retention time is 8-12h, and the dissolved oxygen concentration is controlled below 0.5mg / L. Under anoxic conditions, denitrifying bacteria convert nitrate nitrogen into nitrogen gas to achieve denitrification. The outlet of anoxic reaction tank 6 is connected to the inlet of aerobic reaction tank 7. Aerobic reaction tank 7 is equipped with an aerator and biofill. The biofill is conventional, with a fill rate of 30-50%. The aerator provides enough air to maintain a dissolved oxygen concentration of 2-4 mg / L within the tank, with a hydraulic retention time of 16-24 hours. Aerobic microorganisms attach to the biofill and feed on organic matter in the wastewater, breaking it down into inorganic substances such as carbon dioxide and water. Simultaneously, they undergo nitrification, converting ammonia nitrogen into nitrate nitrogen.

[0017] In this embodiment, the deep purification module includes a sedimentation tank, a filtration device and a disinfection device, and is a prior art and is not shown in the figure. The water inlet of the sedimentation tank is connected to the water outlet of the aerobic reaction tank, which is used to precipitate the suspended sludge in the sewage so that the sewage is preliminarily purified. The water outlet of the sedimentation tank is connected to the water inlet of the filtration device. The filtration device adopts an activated carbon filter. The filling height of the activated carbon is 1-1.5m and the filtration speed is 5-10m / h. The activated carbon has a developed pore structure and can absorb residual organic matter, color and odor in the sewage. The water outlet of the filtration device is connected to the water inlet of the disinfection device. The disinfection device adopts an ultraviolet sterilizer with an ultraviolet dose of 15-30mJ / cm², which can kill bacteria, viruses and other microorganisms in the sewage to ensure the safety of the effluent water quality.

[0018] In this embodiment, the sludge treatment module includes a sludge thickening tank, a sludge dewatering machine, and a sludge drying device. These are conventional technologies and are not shown in the figure. The water inlet of the sludge thickening tank is connected to the sludge outlets of the grit chamber 2, the regulating tank, the anaerobic reaction tank, the anoxic reaction tank, the aerobic reaction tank, and the sedimentation tank, respectively, to concentrate the sludge produced by each treatment unit and reduce its volume. The water outlet of the sludge thickening tank is connected to the water inlet of the sludge dewatering machine, which utilizes a conventional plate and frame filter press. This machine can further dehydrate the concentrated sludge, reducing its moisture content to 60-70%. The water outlet of the sludge dewatering machine is connected to the water inlet of the sludge drying device. The sludge drying device uses a hot air dryer with a drying temperature of 60-80°C to dry the dehydrated sludge to a moisture content of less than 30%, which is convenient for the transportation, storage and subsequent disposal of the sludge, such as landfill, incineration or resource utilization.

[0019] In this embodiment, the bottom of the grille device 1 is provided with a first-level table 8 and a second-level table 9, and the height of the first-level table 8 is greater than the height of the second-level table 9 to prevent excessive accumulation of impurities on one table. The water outlet of the grille device 1 is located at the bottom of the first-level table 8, and a discharge pipe 10 is provided at the bottom of the second-level table 9. In this embodiment, a conical bottom plate 11 is provided on the bottom of the grit chamber 2 , a discharge pipe 12 is provided at the end of the conical bottom plate 11 , and a grit screen 13 is provided above the conical bottom plate 11 .

[0020] The working principle of the present invention is as follows: the screen device 1 adopts a rotary screen 4 with a screen gap of 5-10mm. Its function is to remove large particles of suspended matter and floating objects in the sewage to prevent subsequent equipment from being blocked. The outlet end of the screen device 1 is connected to the water inlet end of the grit chamber 2. The grit chamber 2 is a cyclone-type grit chamber. A stirring device is provided in the tank with a stirring speed of 10-20r / min. The sand particles in the sewage can be separated by centrifugal force to reduce the wear of the sand particles on the subsequent treatment equipment. The outlet end of the grit chamber 2 is connected to the water inlet end of the regulating tank 2. The regulating tank 2 is provided with an aeration device and a pH adjustment device. The aeration volume of the aeration device is 0.5-1.0m³ / (h・m³). Aeration can prevent the precipitation of suspended matter in the sewage, and at the same time play the role of pre-aeration and water quality adjustment. The pH adjustment device can adjust the pH value of the sewage to 6-8, creating a suitable pH environment for subsequent biochemical treatment.

[0021] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A manual soy sauce fermentation wastewater advanced treatment system, characterized by: It includes a pretreatment module, a biochemical treatment module, a deep purification module and a sludge treatment module connected in sequence; the pretreatment module includes a grille device, a grit chamber and a regulating tank, the water outlet of the grille device is connected to the water inlet of the grit chamber, and the water outlet of the grit chamber is connected to the water inlet of the regulating tank; The biochemical treatment module includes an anaerobic reaction tank, an anoxic reaction tank and an aerobic reaction tank. The water inlet of the anaerobic reaction tank is connected to the water outlet of the regulating tank, the water outlet of the anaerobic reaction tank is connected to the water inlet of the anoxic reaction tank, and the water outlet of the anoxic reaction tank is connected to the water inlet of the aerobic reaction tank; the deep purification module includes a sedimentation tank, a filtering device and a disinfection device. The water inlet of the sedimentation tank is connected to the water outlet of the aerobic reaction tank, the water outlet of the sedimentation tank is connected to the water inlet of the filtering device, and the water outlet of the filtering device is connected to the water inlet of the disinfection device; the sludge treatment module includes A sludge thickening tank, a sludge dewatering machine and a sludge drying device, wherein the water inlet of the sludge thickening tank is respectively connected to the sludge discharge ports of the grit tank, the regulating tank, the anaerobic reaction tank, the anoxic reaction tank, the aerobic reaction tank and the sedimentation tank; the water outlet of the sludge thickening tank is connected to the water inlet of the sludge dewatering machine; the water outlet of the sludge dewatering machine is connected to the water inlet of the sludge drying device; a first-level table and a second-level table are provided at the bottom of the grille device, and the height of the first-level table is greater than the height of the second-level table; the water outlet of the grille device is located at the bottom of the first-level table; a discharge pipe is provided at the bottom of the second-level table.

2. A manual soy sauce fermentation wastewater deep treatment system according to claim 1, characterized in that: The grille device adopts a rotary grille with a grille gap of 5-10 mm. An inclined filter screen plate is provided above the water outlet end of the grille device, and both ends of the inclined filter screen plate are fixed by bolts.

3. A manual soy sauce fermentation wastewater deep treatment system according to claim 1, characterized in that: The grit chamber is a cyclone type grit chamber, in which a stirring device is provided, and the stirring speed is 10-20 r / min.

4. A manual soy sauce fermentation wastewater deep treatment system according to claim 3, characterized in that: The regulating tank is provided with an aeration device and a pH regulating device. The aeration capacity of the aeration device is 0.5-1.0m³ / h·m³, and the pH regulating device can adjust the pH value of the sewage to 6-8.

5. A manual soy sauce fermentation wastewater deep treatment system according to claim 2, characterized in that: The anaerobic reaction tank is provided with a three-phase separator and a stirring device, the reaction temperature is controlled at 30-35°C, the hydraulic retention time is 24-48h, a conical bottom plate is provided at the bottom of the grit chamber, a discharge pipe is provided at the end of the conical bottom plate, and a grit screen is provided above the conical bottom plate.

6. A manual soy sauce fermentation wastewater advanced treatment system according to claim 5, characterized in that: The anoxic reaction tank is provided with a stirring device, the hydraulic retention time is 8-12 hours, and the dissolved oxygen concentration is controlled below 0.5 mg / L.

7. A manual soy sauce fermentation wastewater advanced treatment system according to claim 1, characterized in that: The aerobic reaction tank is provided with an aeration device and biological fillers, the filling rate of the biological fillers is 30-50%, the aeration capacity of the aeration device can keep the dissolved oxygen concentration in the tank at 2-4 mg / L, and the hydraulic retention time is 16-24 hours.

8. A manual soy sauce fermentation wastewater deep treatment system according to claim 1, characterized in that: The filtering device adopts an activated carbon filter, the filling height of the activated carbon is 1-1.5m, and the filtering speed is 5-10m / h.

9. A manual soy sauce fermentation wastewater deep treatment system according to claim 1, characterized in that: The disinfection device adopts an ultraviolet disinfector with an ultraviolet dose of 15-30mJ / cm².

10. The manual soy sauce fermentation wastewater deep treatment system according to claim 1, characterized in that: The sludge dewatering machine adopts a plate and frame filter press, and the sludge drying device adopts a hot air dryer with a drying temperature of 60-80°C.

Images