A wastewater treatment system for aquatic product processing

Abstract

This utility model discloses a wastewater treatment system for aquatic product processing, comprising an operating platform, a base frame, a primary filter basin, and a wastewater treatment tank. The wastewater treatment tank has an upward-opening cavity and a cover over the cavity opening. A partition divides the cavity into a wastewater chamber and a treatment chamber. The treatment chamber has multiple treatment layers and an outlet pipe communicating with the outside. The multiple treatment layers consist of a gravel layer, a sponge layer, an activated carbon layer, and a hollow layer from left to right. A water pump draws wastewater from the wastewater chamber into the gravel layer, and the wastewater sequentially passes through the gravel layer, sponge layer, activated carbon layer, and hollow layer. The water from the hollow layer is discharged from the wastewater treatment tank through the outlet pipe. This utility model realizes a treatment system capable of treating wastewater generated from aquatic product processing, enabling its discharge.

Description

Technical Field

[0001] This utility model relates to the field of food processing technology, and in particular to a wastewater treatment system for aquatic product processing. Background Technology

[0002] Aquatic products are often processed before being sold. This usually involves on-site cleaning, slaughtering, and gutting on a workbench to remove unwanted scraps and ensure they are thoroughly cleaned before being delivered to customers. However, this processing generates a large amount of wastewater containing scraps, blood, and grease. Direct discharge of this wastewater can lead to bacterial growth and hygiene problems, failing to meet wastewater discharge requirements. Therefore, it is necessary to design a treatment system that can treat the wastewater generated from aquatic product processing and allow it to be discharged safely. Utility Model Content

[0003] The purpose of this invention is to provide a wastewater treatment system for aquatic product processing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A wastewater treatment system for aquatic product processing includes an operating table, a base frame, a primary filter basin, and a wastewater treatment tank. The operating table is mounted on the base frame and is equipped with a downward-facing drain pipe. The primary filter basin is placed on the base frame and below the drain pipe. The primary filter basin has an upward-facing cavity, and its side wall is provided with a side drain outlet and a barrier net 2-5 cm from the top. Wastewater flowing out of the side drain outlet is introduced into the wastewater treatment tank through a water pipe. The wastewater treatment tank has an upward-opening cavity and a cover over the cavity opening. Inside the cavity, a partition divides it into a wastewater cavity and a treatment cavity. The cover has an inlet pipe at the wastewater cavity that connects to the primary filter basin. A water pump is located at the bottom of the wastewater cavity and transports the wastewater to the treatment cavity on the other side of the partition via a water pipe. The treatment cavity has multiple treatment layers and an outlet pipe that connects to the outside. The multiple treatment layers consist of a gravel layer, a sponge layer, an activated carbon layer, and a hollow layer from left to right. The water pump draws the wastewater from the wastewater cavity into the gravel layer, and the wastewater passes through the gravel layer, sponge layer, activated carbon layer, and hollow layer in sequence. The water from the hollow layer is discharged from the wastewater treatment tank through the outlet pipe.

[0005] Furthermore, the primary filter basin is provided with a water guide basin outside the side drain outlet. The bottom of the water guide basin has an opening and a pipe, which is connected to the water inlet pipe of the tank cover through a water pipe.

[0006] Furthermore, the water pump is equipped with an inlet pipe and an outlet pipe, with a filter screen at the inlet pipe and the end of the outlet pipe located on the upper half of a partition.

[0007] Furthermore, the multi-level processing layers are separated by frame-type partitions, which are equipped with leak-proof meshes whose apertures are adapted to the materials on their left and right sides.

[0008] Furthermore, the water inlet pipe of the tank cover has a column threadedly installed inside the sewage chamber, which has multiple filter holes to block dirt.

[0009] By adopting the above technical solution, this utility model has the following advantages compared with the prior art: This utility model utilizes a wastewater treatment tank to store wastewater in its wastewater chamber, which also allows for preliminary sedimentation. A water pump draws the wastewater into the treatment chamber, where it is filtered by a layer of gravel, a layer of sponge, and a layer of activated carbon to remove blood and grease. The filtered wastewater then enters an empty layer and is discharged to the outside through an outlet pipe. This system is capable of treating wastewater generated from aquatic product processing, making it suitable for discharge. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a bottom view of the present invention; Figure 3 This is a schematic diagram of the wastewater treatment tank of this utility model.

[0011] Explanation of reference numerals in the attached figures: 1. Operating platform; 2. Base frame; 3. Primary filter basin; 4. Wastewater treatment tank; 11. Drain pipe; 31. Water guide basin; 41. Tank cover; 42. Partition plate; 43. Wastewater chamber; 44. Treatment chamber; 411. Inlet pipe; 412. Column; 431. Water pump; 432. Filter screen; 441. Outlet pipe; 442. Stone layer; 443. Sponge layer; 444. Activated carbon layer; 445. Empty layer. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0013] It should be noted that in this utility model, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element of this utility model must have a specific orientation, and therefore should not be construed as a limitation of this utility model. Example

[0014] Cooperate Figures 1 to 3As shown, this utility model discloses a wastewater treatment system for aquatic product processing, including an operating table 1, a base frame 2, a primary filter basin 3, and a wastewater treatment tank 4. The operating table 1 is installed on the base frame 2 and is provided with a downward-facing drain pipe 11. The primary filter basin 3 is placed on the base frame 2 and below the drain pipe 11. The primary filter basin 3 has an upward-facing cavity, and its side wall is provided with a side drain outlet and a barrier net 2-5 cm from the top. The primary filter basin 3 can initially block waste materials such as scraps with obvious volume. Then, the wastewater flowing out of the side drain outlet is introduced into the wastewater treatment tank 4 through the water pipe.

[0015] The worktable in this embodiment is made of 304 stainless steel plate, 5mm thick. Reason for selection: Wastewater from seafood processing contains corrosive substances such as salt and blood. 304 stainless steel has excellent corrosion resistance and a smooth, easy-to-clean surface, meeting the hygiene requirements of food processing scenarios and preventing secondary pollution of wastewater due to material corrosion. A 5cm high water-retaining edge is provided along the edge of the worktable to prevent wastewater from overflowing during processing. The inner slope of the water-retaining edge is 15°, guiding the wastewater to the drain pipe in the center of the worktable.

[0016] The drain pipe is made of PVC with an inner diameter of 50mm. It is installed vertically downwards at the center of the workbench bottom and is 30cm long (to ensure that wastewater falls vertically into the primary filter basin below, avoiding blockage caused by excessive pipe length). The inner wall of the drain pipe is smooth to reduce wastewater flow resistance, and the bottom end is aligned with the center of the primary filter basin cavity with a deviation of no more than 2cm to ensure that wastewater flows completely into the primary filter basin.

[0017] The base frame is welded from Q235 angle steel, with specifications of 50mm×50mm×5mm. It features four height-adjustable rubber feet at the bottom (adjustment range 5-10cm). Reasons for selection: Q235 angle steel has strong load-bearing capacity (single frame load capacity not less than 500kg), stably supporting the operating platform, primary filter basin, and wastewater treatment tank; the rubber feet adapt to different ground flatness levels, preventing direct contact between the metal base frame and the ground, thus avoiding rust, and reducing vibration transmission during equipment operation. The top of the base frame has stainless steel connectors matching the bottom surface of the operating platform (fixed with bolts, M8×20mm bolts, 30cm spacing), ensuring the operating platform remains stable after installation; a pre-reserved area for the primary filter basin is provided in the middle of the base frame (size matches the filter basin, gap not exceeding 1cm), with positioning protrusions at the edge of the area to prevent the primary filter basin from shifting during equipment operation or operator movement, ensuring the drain pipe is aligned with the filter basin cavity.

[0018] The side drain outlet is located 3cm from the top of the filter basin (preferred value; less than 2cm may cause impurities to overflow with the wastewater, and more than 5cm may cause the liquid level in the basin to overflow due to excessive height). The opening is rectangular, measuring 10cm x 5cm, with rounded edges (to prevent scratching operators or water pipes). The barrier net is made of nylon with a 1.5mm aperture (capable of blocking impurities ≥1.5mm in size, such as fish scales, fish viscera fragments, and shrimp shells, without affecting the wastewater flow rate). The barrier net is fixed to the inside of the side drain outlet via a 2mm deep slot, ensuring that the barrier net is flat and secure after installation and can be quickly disassembled for cleaning (disassembly time does not exceed 30 seconds).

[0019] The wastewater treatment tank 4 has an upward-facing cavity and a cover 41 covering the cavity opening. A partition 42 inside the cavity divides it into a wastewater cavity 43 and a treatment cavity 44. The cover 41 has an inlet pipe 411 at the wastewater cavity 43 that connects to the primary filter basin 3. A water pump 431 is installed at the bottom of the wastewater cavity 43 and transports the wastewater to the treatment cavity 44 on the other side of the partition 42 through a water pipe. The treatment cavity 44 has a multi-stage treatment layer and an outlet pipe 441 that communicates with the outside. The multi-stage treatment layer consists of a gravel layer 442, a sponge layer 443, an activated carbon layer 444, and an empty layer 445 from left to right. The water pump 431 pumps the wastewater from the wastewater cavity 43 into the gravel layer 442. The wastewater passes through the gravel layer 442, the sponge layer 443, the activated carbon layer 444, and the empty layer 445 in sequence, and the water in the empty layer 445 is discharged from the wastewater treatment tank 4 by the outlet pipe 441.

[0020] Container Material and Structure: Made of high-strength polyethylene (HDPE) through blow molding, the overall shape is a cuboid, 80cm long, 50cm wide, and 60cm high, with a wall thickness of 8mm. Reason for Selection: HDPE is resistant to acid and alkali corrosion (can withstand wastewater with pH values ​​of 3-11), has high impact resistance (can withstand the impact of a 10kg weight without breaking), and is suitable for long-term treatment of aquatic wastewater containing blood and oil; the smooth inner wall of the container reduces contaminant adhesion. The container is equipped with vertical partitions (material consistent with the container body, 5mm thick), with the partition height matching the inner wall height (60cm), dividing the container into a left wastewater chamber (120L volume) and a right treatment chamber (180L volume). The partitions are hot-melt welded to the inner wall of the container, with a weld strength ≥15MPa, ensuring no crossflow.

[0021] The tank lid is made of HDPE, 5mm thick, and is connected to the top of the tank body using four sets of M6×20mm stainless steel bolts, with a bolt spacing of 20cm. A silicone sealing ring (5mm×5mm cross-section, oil-resistant silicone) is installed on the contact surface between the lid and the tank body, ensuring a tight seal: no gas leakage at an internal pressure of 0.05MPa, preventing the spread of sewage odor. A 50mm diameter circular hole is cut into the lid corresponding to the sewage chamber for installing the inlet pipe (the inlet pipe is made of PVC, 20cm long, with one end heat-fused to the circular hole and the other end threaded to the water inlet basin).

[0022] In this embodiment, a water pump can also be installed in the outlet pipe 441 to pressurize and increase the speed at which sewage passes through the treatment chamber 44.

[0023] A corrosion-resistant submersible pump with a power of 1.5kW, a head of 5m, and a flow rate of 10m³ / h was selected. Reasons for selection: The submersible pump can be placed directly at the bottom of the wastewater chamber without requiring additional installation space; the 1.5kW power is sufficient to meet the wastewater transport requirements from the wastewater chamber to the treatment chamber (the height difference between the top of the treatment chamber and the bottom of the wastewater chamber is 30cm); and the 10m³ / h flow rate matches the wastewater production during peak aquatic product processing periods (approximately 8-12m³ / h), preventing wastewater accumulation in the wastewater chamber. The pump power cord is a waterproof cable (2m long, IP68 protection rating), led out through a waterproof cable hole on the side of the casing, and connected to an external leakage protection switch (rated current 10A) to ensure electrical safety.

[0024] The water pump inlet pipe is made of PVC, with an inner diameter of 32mm and a length of 15cm. One end is threaded to the water pump inlet, and the other end is fitted with a filter screen (made of 304 stainless steel, with a pore size of 0.5mm, a screen height of 5cm, and a cylindrical shape). The filter screen is connected to the inlet pipe by clips and can be disassembled for cleaning. The 0.5mm pore size can filter out fine impurities (such as silt and small pieces of meat) that settle in the sewage chamber, preventing impurities from entering the water pump impeller and causing blockage or wear (test verification: after 72 hours of continuous operation, there was no obvious impurity adhesion to the impeller, and the flow rate attenuation rate was ≤5%).

[0025] The primary filter basin 3 has a water guide basin 31 outside the side drain outlet. It is a basin or funnel structure. The bottom of the water guide basin 31 has an opening and a pipe, which is connected to the water inlet pipe of the box cover 41 through a water pipe.

[0026] The installation method of the cover 41 and the sewage treatment tank 4 in this embodiment is not limited, and can be fixed by screws with matching screw holes.

[0027] The water pump 431 inside the sewage chamber 43 is equipped with an inlet pipe and an outlet pipe. A filter screen 432 is installed at the inlet pipe, and the end of the outlet pipe is located on the upper half of the partition 42, preferably 1-3 cm from the top. The water pump is connected to a control switch and a power supply, which is existing technology and is not limited in this embodiment. The outlet pipe of the water pump is made of PVC material, with an inner diameter of 25 mm and a length of 40 cm. One end is threaded to the water outlet of the water pump, and the other end extends into the treatment chamber, with the end fixed to the upper half of the partition (2 cm from the top of the treatment chamber). The end of the outlet pipe has a 45° bevel cut, facing the top surface of the gravel layer, so that the sewage is evenly sprayed on the surface of the gravel layer, avoiding local water flow impact that could cause the gravel to shift. The outlet pipe is fixed to the partition with stainless steel pipe clamps (10 cm apart) to prevent the outlet pipe from shaking when the water pump is running.

[0028] The multi-stage treatment layers are separated by frame-type partitions, which are equipped with leak-proof meshes. The mesh size is adapted to the materials on its left and right. For example, the mesh size between the pebble layer and the sponge layer is smaller than the particle size of the pebble layer, and the mesh size between the activated carbon and the sponge layer and the air layer is smaller than the particle size of the activated carbon.

[0029] In this embodiment, the pebble layer 442 is filled with pebbles, the particle size of which is not limited in this embodiment, but is preferably 0.5-3cm. The sponge layer 443 is filled with sponge, and the activated carbon layer 444 is filled with activated carbon. When replacing them, simply open the box cover and take them out. A connecting plate can also be provided between the bottom and sides of the frame-shaped partition, so that the multi-stage treatment layers can be removed by lifting the frame-shaped partition.

[0030] The inlet pipe 411 of the tank cover 41 has a threaded column 412 installed inside the sewage chamber 43, which has multiple filter holes to block dirt. The column is made of 304 stainless steel, with a diameter of 48mm (matching the inner diameter of the inlet pipe), a length of 15cm, and a polished surface (roughness Ra≤0.8μm) to reduce impurity adhesion. Twenty filter holes (0.8mm in diameter, 1.5cm apart, spirally distributed) are evenly opened on the side wall of the column. The axis of the filter holes makes a 30° angle with the axis of the column to ensure that sewage passes through the filter holes evenly from all directions, while blocking fine impurities with a diameter ≥0.8mm (such as fish eggs, shrimp shell fragments).

[0031] Wastewater is stored in the wastewater chamber of the wastewater treatment tank 4, where it can undergo preliminary sedimentation. The wastewater is pumped into the treatment chamber 44 by the water pump 431. The wastewater is filtered by the stone layer 442, the sponge layer 443 and the activated carbon layer 444 to remove blood and grease. The filtered wastewater enters the empty layer and is discharged to the outside through the outlet pipe. This system can treat wastewater generated from aquatic product processing and discharge it.

[0032] Gravel layer: Filled with natural quartz sand and gravel, with a particle size of 1-2cm (particle size deviation ≤0.5cm), and a thickness of 15cm. Reason for selection: Quartz sand and gravel have high hardness (Mohs hardness 7), are wear-resistant, and are not easily dissolved in sewage; the gaps formed by the 1-2cm particle size (approximately 0.3-0.8cm) can filter suspended particles in sewage (such as meat scraps and shrimp shell fragments with a diameter ≥0.3cm), while sewage can quickly permeate (permeation rate ≥0.5m / h), without producing water accumulation.

[0033] Sponge layer: High-density polyurethane sponge, 30kg / m³ density, 90% porosity, 10cm thickness, cut into rectangles (70cm long, 45cm wide) to match the cross-section of the treatment chamber. Reason for selection: The 30kg / m³ density sponge combines adsorption capacity and permeability, adsorbing grease (≥50g / m²) and fine impurities with a diameter of 0.1-0.3cm from wastewater. Simultaneously, the 90% porosity ensures a wastewater infiltration rate ≥0.3m / h, preventing clogging. The polyurethane sponge is resistant to grease corrosion and has a service life ≥30 days (based on 8 hours of operation per day).

[0034] Activated carbon layer: Filled with columnar activated carbon, made of coal-based activated carbon, 5mm in diameter, 10mm in length, and 12cm thick. Reason for selection: Columnar activated carbon has a specific surface area ≥1000m² / g, strong adsorption capacity, and can adsorb odors (such as fishy smell), pigments (red pigments from blood), and organic pollutants (such as amines produced by protein decomposition) in wastewater; the 5mm×10mm size creates uniform gaps (approximately 2mm), resulting in a wastewater infiltration rate ≥0.2m / h, while also preventing activated carbon particles from being lost with the wastewater.

[0035] Empty layer: Located at the bottom of the treatment chamber, 10cm high, without filling material. Function: Provides a buffer space for filtered wastewater, preventing wastewater from flowing directly out of the activated carbon layer and ensuring that unadsorbed pollutants settle further in the empty layer; at the same time, operators can observe the clarity of the wastewater in the empty layer through the cover to determine whether the multi-stage treatment layer needs to be replaced (when the turbidity of the wastewater in the empty layer is ≥50 NTU, it indicates that the filter material should be replaced).

[0036] The mesh between the pebble layer and the sponge layer has a pore size of 0.3cm to prevent pebbles (minimum particle size 1cm) from falling into the sponge layer; The mesh between the sponge layer and the activated carbon layer has a pore size of 0.4 mm to prevent sponge debris (which may be generated by sewage impact) from entering the activated carbon layer. The partition between the activated carbon layer and the empty layer has a pore size of 0.3mm to prevent activated carbon particles (5mm in diameter) from entering the empty layer. A 1mm thick rubber pad is wrapped around the outside of the frame-type partition, ensuring a tight fit with the inner wall of the treatment chamber (fitting gap ≤0.1mm) to prevent wastewater from flowing between layers. A PP plastic handle (8cm high, 5cm wide) is provided at the top of the partition, allowing operators to easily open the lid and remove the entire multi-stage treatment layer for replacement (single-person operation, replacement time ≤5 minutes).

[0037] Seafood processing operation: Operators clean, slaughter, and cut seafood (such as fish, shrimp, and crab) on the worktable. The wastewater generated carries impurities (fish scales, viscera fragments, shrimp shells, etc.) and flows along the water-blocking edge of the worktable to the central drain pipe, which then flows into the primary filter basin below.

[0038] Primary filtration: The nylon mesh (1.5mm aperture) in the primary filter basin blocks impurities with a volume ≥1.5mm. Wastewater accumulates in the filter basin. When the liquid level reaches the height of the side drain (3cm from the top), the wastewater flows into the guide basin through the side drain. The guide basin then transports the wastewater to the inlet pipe of the wastewater treatment tank through the PVC pipe.

[0039] Secondary pretreatment: Wastewater flows through a stainless steel column in the inlet pipe. The filter holes (0.8mm in diameter) on the column further block small impurities. The treated wastewater then enters the wastewater chamber of the wastewater treatment tank.

[0040] Wastewater sedimentation: Wastewater is allowed to settle in the wastewater chamber (120L volume). Larger impurities (such as silt) settle to the bottom of the chamber. The settling time is about 5 minutes (judged by the liquid level observation window, which is located on the side wall of the wastewater chamber and is level with the side drain outlet).

[0041] Wastewater transport: Start the water pump (controlled by an external switch). The water pump draws the wastewater from the upper layer of the wastewater chamber through the inlet pipe with a filter screen (0.5mm aperture) and transports the wastewater to the top surface of the gravel layer in the treatment chamber through the outlet pipe (the end of which is located 2cm above the upper part of the partition).

[0042] Multi-stage filtration: Gravel layer filtration: Wastewater is evenly sprayed onto the surface of the gravel layer, and suspended particles with a diameter of ≥0.3cm are filtered through the gaps between the gravels (0.3-0.8cm), thus initially purifying the wastewater; Sponge layer adsorption: Wastewater permeates through the stone layer to the sponge layer, where the sponge adsorbs grease and fine impurities with a diameter of 0.1-0.3 cm through its pores, reducing the oil content of the wastewater; Activated carbon adsorption: Wastewater continues to permeate into the activated carbon layer. The activated carbon adsorbs odors, pigments and organic pollutants through its large specific surface area, improving the sensory properties of the wastewater (such as removing fishy smell and diluting the color of bloody water). Empty layer buffer: The filtered wastewater enters the empty layer, where residual tiny particles are further settled. Finally, the wastewater that meets the discharge requirements is discharged through the effluent pipe (the effluent pipe is located at the bottom of the side wall of the empty layer, with an inner diameter of 40mm, made of PVC, and connected to the external drainage pipe).

[0043] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A wastewater treatment system for aquatic product processing, characterized in that: It includes an operating table, a base frame, a primary filter basin, and a sewage treatment tank. The operating table is installed on the base frame and is equipped with a downward-facing drain pipe. The primary filter basin is placed on the base frame and below the drain pipe. The primary filter basin has an upward-facing cavity, and its side wall is equipped with a side drain outlet and a barrier net 2-5cm away from the top. The sewage flowing out of the side drain outlet is introduced into the sewage treatment tank through a water pipe. The wastewater treatment tank has an upward-facing cavity and a cover over the cavity opening. The cavity is divided into a wastewater cavity and a treatment cavity by a partition. The cover has an inlet pipe at the wastewater cavity that connects to the primary filter basin. A water pump is installed at the bottom of the wastewater cavity and transports the wastewater to the treatment cavity on the other side of the partition via a water pipe. The treatment cavity has multiple treatment layers and an outlet pipe that connects to the outside. The multiple treatment layers consist of a gravel layer, a sponge layer, an activated carbon layer, and a hollow layer from left to right. The water pump draws the wastewater from the wastewater cavity into the gravel layer. The wastewater passes through the gravel layer, sponge layer, activated carbon layer, and hollow layer in sequence, and the water in the hollow layer is discharged from the wastewater treatment tank through the outlet pipe.

2. The wastewater treatment system for aquatic product processing as described in claim 1, characterized in that: The primary filter basin has a water guide basin outside the side drain outlet. The bottom of the water guide basin has an opening and a pipe, which is connected to the water inlet pipe of the tank cover through a water pipe.

3. The wastewater treatment system for aquatic product processing as described in claim 1, characterized in that: The water pump is equipped with an inlet pipe and an outlet pipe. A filter screen is installed at the inlet pipe, and the end of the outlet pipe is located on the upper half of the partition.

4. The wastewater treatment system for aquatic product processing as described in claim 1, characterized in that: The multi-level processing layers are separated by frame-type partitions, which are equipped with leak-proof meshes with pore sizes adapted to the materials on their left and right sides.

5. A wastewater treatment system for aquatic product processing as described in claim 1, characterized in that: The water inlet pipe of the tank cover has a column threadedly installed inside the sewage chamber, which has multiple filter holes to block dirt.

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