A suspended solids collection system and method for recirculating aquaculture pond effluent

Abstract

The application provides a suspended matter collecting system and method for factory breeding pond sewage, wherein the water turbidity in the breeding pond is obtained through a suspended matter detection device, when the water turbidity exceeds the preset turbidity value, the air compressor is started to collect the suspended matter through a suspended matter collector; during the suspended matter collecting process, the content change of the water suspended matter in the breeding pond is calculated through a collection control module, when the content change of the suspended matter is less than the change threshold value, the air compressor is controlled to stop running, and the suspended matter collecting process is ended. The turbidity of the water in the breeding pond is detected through the sensor, the starting of the collecting process is controlled according to the real-time detection value, the mass change of the suspended matter is expressed through the pressure difference value of the water, the stopping of the collecting process is controlled according to the mass change, the automatic control of the sewage treatment in the breeding pond is realized, the water quality stability of the water body is beneficial to be maintained, the energy consumption is reduced, and the green breeding of energy saving and emission reduction is realized.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a suspended solids collection system and method for wastewater from factory-scale aquaculture ponds. Background Technology

[0002] In factory aquaculture ponds, a large amount of suspended solids often exists. The organic matter in these suspended solids consumes dissolved oxygen during decomposition, leading to a decrease in dissolved oxygen levels and threatening the survival of organisms within the pond. Furthermore, excessive suspended solids reduce water transparency, affecting the feeding behavior of organisms, causing decreased appetite, and consequently impacting their growth rate and health. For example, in recirculating aquaculture systems, when the turbidity of the water reaches a certain concentration, fish exhibit poor appetite, less aggressive feeding, and slow growth.

[0003] The suspended particles in aquaculture ponds vary in size, ranging from a few micrometers to a few millimeters. 64% of these particles are smaller than 30 micrometers. These tiny particles are slightly heavier than water, exhibiting good flowability and some adhesion. Larger suspended particles mainly consist of uneaten feed and excrement from aquaculture organisms. In practical treatment projects, mechanical filters (also known as microfilters, such as fixed screens, rotary drum microfilters, and arc screens) are commonly used to handle particles of 60–200 μm, and are a widely applied and effective filtration method. However, mechanical filters are not very effective at handling loosely structured, high-volume organic suspended particles, easily causing filter clogging and reducing filtration efficiency. They also have strict requirements regarding filter specifications and cartridge rotation speed. Therefore, existing technologies often struggle to collect different types of suspended solids. Furthermore, traditional methods often rely on manual collection, which not only fails to guarantee effective removal but also makes it difficult to monitor the water conditions in the aquaculture pond, leading to delayed cleaning. Summary of the Invention

[0004] In view of this, the present invention proposes a suspended solids collection system and method for wastewater from factory-scale aquaculture ponds to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this invention proposes a suspended solids collection system for wastewater from factory-scale aquaculture ponds, including a suspended solids detection device, a collection control module, an air compressor, and a suspended solids collector.

[0006] The suspended solids detection device is used to detect the turbidity of the water in the aquaculture pond and the pressure value in the suspended solids collector.

[0007] The collection control module is used to control the start and stop of the air compressor according to the turbidity of the water and the pressure changes in the suspended solids collector at different times.

[0008] The air compressor is used to collect suspended solids in the water of the aquaculture pond into the suspended solids collector.

[0009] The suspended matter collector is used to extract suspended matter.

[0010] Furthermore, the suspended solids collector includes an aeration device, a water flow guiding device, and an organic floc deposition extraction device; the aeration device is located in the lower middle part of the water flow guiding device, and the organic floc deposition extraction device is located inside the water flow guiding device.

[0011] The aeration device delivers high-pressure gas generated by the air compressor to the water flow guiding device, which in turn drives the water flow out from above the water flow guiding device, causing suspended solids in the water flow to accumulate in the sedimentation pan; the organic floc deposition extraction device then extracts the suspended solids.

[0012] Furthermore, the suspended solids detection device includes a sensor assembly; the sensor assembly includes a turbidity meter and a pressure sensor, the turbidity meter is disposed on both sides of the bottom sedimentation plate of the water flow guiding device, and the pressure sensor is disposed in the middle of the bottom sedimentation plate of the water flow guiding device; the turbidity of the water in the aquaculture pond is detected by the turbidity meter, and the water pressure at the bottom of the sedimentation plate is detected by the pressure sensor.

[0013] Furthermore, the collection control module controls the operation or shutdown of the system based on the water turbidity obtained by the turbidity meter. When the water turbidity exceeds a preset turbidity value, the collection control module controls the air compressor to start running.

[0014] During the collection of suspended solids, the collection control module calculates the pressure difference of the pressure sensor over different time periods, and uses the pressure difference to represent the change in the content of suspended solids; the collection control module sets a change threshold according to the water purification requirements, and when the pressure difference is less than the change threshold, it controls the air compressor to stop running.

[0015] Furthermore, the water flow guiding device is also equipped with a suspended solids modification device, which includes a modifier. During the suspended solids collection process, the suspended solids modification device releases the modifier onto the aggregated suspended solids to modify the particles within the suspended solids. The modifier comprises alumina, iron oxide, silicate, and aluminate.

[0016] On the other hand, to achieve the above objectives, the present invention proposes a method for collecting suspended matter based on the above system, comprising the following steps:

[0017] The turbidity of the water in the aquaculture pond is obtained by a suspended solids detection device. When the turbidity of the water exceeds the preset turbidity value, the air compressor is started and the suspended solids are collected by the suspended solids collector.

[0018] During the suspended solids collection process, the collection control module calculates the change in the content of suspended solids in the aquaculture pond. When the change in the content of suspended solids is less than the change threshold, the air compressor is controlled to stop running, thus ending the suspended solids collection process.

[0019] Furthermore, during the collection of suspended solids, the air compressor is activated to deliver high-pressure gas to the suspended solids collector. The high-pressure gas forms a local vortex through the gas guide cone inside the suspended solids collector, which drives the water flow through the inlet into the lower part of the water flow guide device. Under the shearing action of the vortex, the water flows out from the top of the water flow guide device, causing the suspended solids in the water flow to accumulate in the sedimentation pan at the bottom of the suspended solids collector. The suspended solids are then extracted by the organic floc deposition extraction device in the suspended solids collector.

[0020] Furthermore, the process of calculating changes in the suspended solids content in the aquaculture pond through the collection and control module includes:

[0021] The pressure difference obtained by the pressure sensor at different time periods is calculated, and the change in the content of suspended solids is expressed by the pressure difference; a change threshold is set according to the water purification requirements, and when the pressure difference is less than the change threshold, the air compressor is controlled to stop running.

[0022] Furthermore, the method for calculating the suspended solids content is as follows:

[0023]

[0024] Where C represents the concentration of suspended solids in the suspended solids collector, A represents the pressure value detected by the pressure sensor at time a, B represents the pressure value detected by the pressure sensor at time b, and V represents the volume of water that the suspended solids collector can hold.

[0025] Furthermore, during the collection of suspended solids, a modifier is released into the sedimentation pan to modify the suspended particles within the pan; the modifier comprises alumina, iron oxide, silicate, and aluminates.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] This invention optimizes the internal structure of the suspended solids collector, utilizing the vortex effect of high-pressure gas to effectively collect suspended solids in aquaculture ponds. This helps maintain stable water quality, reduces energy consumption, and increases dissolved oxygen in the water, achieving energy-saving and emission-reducing green aquaculture. Furthermore, this invention uses sensors to detect the turbidity of the water in the aquaculture pond and controls the start of the collection process based on real-time detection values. It also calculates the pressure difference in the water to represent the mass change of suspended solids and controls the cessation of the collection process based on the mass change, thus achieving automated control of wastewater treatment in aquaculture ponds. In addition, this application modifies suspended solids through organic matter during the collection process, further improving the collection effect. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a schematic diagram of the suspended matter collector structure in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the organic floc deposition extraction device in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the aeration device structure in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the cross-section of the gas diversion and guide in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the suspended matter collection method in an embodiment of the present invention;

[0034] Among them: 1-Water flow guiding device, 2-Aeration device, 3-Gas guide cone, 4-Sediment extraction pipe, 5-Gas diverter and guide, 6-Water inlet, 7-Positioning screw, 8-Fixer, 9-Connector, 10-Sedimentation plate, 11-Filter cover, 12-Gas input pipe, 13-Aeration hole, 14-Connecting port, 15-Round hole, 16-Concentric air supply channel, 17-Water inlet, 18-Turbidity meter, 19-Pressure sensor. Detailed Implementation

[0035] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] This embodiment proposes a suspended solids collection system and method for wastewater from factory-scale aquaculture ponds, including a suspended solids detection device, a collection control module, an air compressor, and a suspended solids collector.

[0037] The suspended solids detection device is used to detect the turbidity of the water in the aquaculture pond and the pressure value in the suspended solids collector.

[0038] The collection control module is used to control the start and stop of the air compressor according to the turbidity of the water and the pressure changes in the suspended solids collector at different times.

[0039] The air compressor is used to collect suspended solids in the water of the aquaculture pond into the suspended solids collector.

[0040] The suspended matter collector is used to extract suspended matter.

[0041] As a preferred embodiment, such as Figure 1 As shown, the suspended solids collector described in this embodiment includes an aeration device 2, a water flow guiding device 1, and an organic floc sediment extraction device; wherein, the aeration device is located in the lower middle part of the water flow guiding device, and the organic floc sediment extraction device is located inside the water flow guiding device.

[0042] The high-pressure gas generated by the air compressor is delivered to the water flow guiding device through the aeration device, and the water flows out from above the water flow guiding device, so that the suspended solids in the water flow gather in the sedimentation pan; the suspended solids are extracted by the organic floc sedimentation extraction device.

[0043] In a preferred embodiment, the aeration device 2 described in this embodiment includes a gas guide cone 3, a gas distributor and guide 5, and a gas input pipe 12. The gas guide cone 3 is funnel-shaped, and a connector 2 is provided on the upper edge of the funnel-shaped gas guide cone 3, which is connected to the water flow guide device 1. The gas distributor and guide 5 is disc-shaped with a circular hole in the middle, which is tightly inserted into a rigid extraction pipe. At the same time, two concentric circular air supply channels are provided inside the gas distributor and guide 5. An aeration hole 13 communicating with the air supply channels is provided on the upper surface of the gas distributor and guide 5. The air inlet of the gas distributor and guide 5 is connected to the gas input pipe 12 through a connection port 14. One end of the gas input pipe 12 is connected to the gas distributor and guide 5, and the other end is connected to an air compressor. Compressed air provided by the air compressor outside the collector enters the concentric circular air supply channel 16 through the gas input pipe 12, and finally releases air into the water through the aeration hole 13.

[0044] As a preferred embodiment, the water flow guiding device 1 described in this embodiment is a frustum-shaped structure with openings at the top and bottom. The lower half of its side wall is provided with an inlet 6, and the bottom edge of the side wall extends outward with a base. A round hole is provided on the base. The collector is fixed to the bottom of the aquaculture pond through the round hole and the positioning screw 7, and is further fixed by the fixing device 8. The sedimentation plate is connected to the organic floc sedimentation extraction device through the connector 9.

[0045] In a preferred embodiment, the organic floc deposition extraction device includes a filter cover 11, which is inverted and has a circular hole 15 on its upper surface. The circular hole 15 is connected to the sediment extraction pipe 4. The side of the filter cover 11 is provided with a plurality of grid-shaped suction inlet holes 17 at equal intervals. Wastewater containing suspended solids enters the filter cover through the inlet holes 17, and the aggregated suspended solids are extracted through the sediment extraction pipe 4.

[0046] In a preferred embodiment, the suspended solids detection device includes a sensor assembly; the sensor assembly includes a turbidity meter 18 and a pressure sensor 19, wherein the turbidity meter 18 is disposed on both sides of the bottom sedimentation plate 10 of the water flow guiding device 1, and the pressure sensor 19 is disposed in the middle of the bottom sedimentation plate 10 of the water flow guiding device 1; the turbidity of the water in the aquaculture pond is detected by the turbidity meter 18, and the water pressure at the bottom of the sedimentation plate 10 is detected by the pressure sensor 19.

[0047] In a preferred embodiment, the collection control module controls the operation or shutdown of the system based on the water turbidity obtained by the turbidity meter 18. When the water turbidity exceeds the preset turbidity value, the collection control module controls the air compressor to start running.

[0048] During the collection of suspended solids, the collection control module calculates the pressure difference value of the pressure sensor 19 at different time periods, and uses the pressure difference value to represent the change in the content of suspended solids; the collection control module sets a change threshold according to the water purification requirements, and when the pressure difference value is less than the change threshold value, it controls the air compressor to stop running.

[0049] Furthermore, the method by which the collection control module calculates the suspended solids content based on the pressure difference of the pressure sensor over different time periods is shown in the following formula:

[0050]

[0051] Where C represents the concentration of suspended solids in the suspended solids collector, A represents the pressure value detected by the pressure sensor at time a, B represents the pressure value detected by the pressure sensor at time b, and V represents the volume of water that the suspended solids collector can hold.

[0052] Understandably, the above calculation method can realize real-time monitoring of the concentration of suspended solids in the collector, and further describe the change in the concentration of suspended solids based on the change in the sensor pressure value. When the pressure value detected by the sensor tends to stabilize, it means that the concentration of suspended solids in the collector no longer changes, the collection of suspended solids in the collector is completed, and at this time the air compressor can be controlled to stop aeration and end the collection process.

[0053] In a preferred embodiment, the water flow guiding device is further provided with a suspended solids modification device, which includes a modifier. During the suspended solids collection process, the suspended solids modification device releases the modifier onto the aggregated suspended solids to modify the particles within the suspended solids. The modifier comprises alumina, iron oxide, silicate, and aluminate.

[0054] Hydrophobic modification refers to influencing the sedimentation and flocculation behavior of particles by altering their surface hydrophobicity. Hydrophobic particles are not hydrophilic, making them difficult to wet in water and thus less likely to clump together. Therefore, to further improve the collection efficiency of suspended solids, this embodiment releases metal oxides and inorganic particles containing alumina, iron oxide, silicate, and aluminates into the sedimentation pan during the suspended solids aggregation process. The metal oxides possess amphoteric properties, effectively altering the surface charge of the suspended solids particles, making them hydrophobic. Meanwhile, the inorganic particles can be adsorbed onto the particle surface through chemical bonds, forming a hydrophobic layer, further enhancing the hydrophobicity of the suspended solids.

[0055] Based on the above-described suspended solids collection system, this embodiment also provides a suspended solids collection method, such as... Figure 5 As shown, it includes the following steps:

[0056] The turbidity of the water in the aquaculture pond is obtained by a suspended solids detection device. When the turbidity of the water exceeds the preset turbidity value, the air compressor is started and the suspended solids are collected by the suspended solids collector.

[0057] During the suspended solids collection process, the collection control module calculates the change in the content of suspended solids in the aquaculture pond. When the change in the content of suspended solids is less than the change threshold, the air compressor is controlled to stop running, thus ending the suspended solids collection process.

[0058] In a preferred embodiment, during the collection of suspended solids, an air compressor is started to deliver high-pressure gas to the suspended solids collector. The high-pressure gas forms a local vortex through the gas guide cone 3 inside the suspended solids collector, which drives the water flow through the water inlet into the water flow guide device 1 below. Under the shearing action of the vortex, the water flows out from the top of the water flow guide device 1, causing the suspended solids in the water flow to accumulate in the sedimentation plate 10 at the bottom of the suspended solids collector. The suspended solids are then extracted by the organic floc deposition extraction device in the suspended solids collector.

[0059] During the operation of the suspended solids collector described in this embodiment, aeration is performed by an air compressor. At this time, high-pressure gas is continuously released upward through the air holes of the gas distributor and guide 5. After encountering the inclined surface of the gas guide cone 3, the gas naturally swirls downward, forming a local vortex within the collector. On the other hand, it also drives the water flow to continuously flow in through the water inlet 6 with a long grid-like opening at the bottom edge of the water flow guide device 1. Simultaneously, the shear force of the vortex forces the water flow out through the upper opening of the water flow guide device 1. Due to the water vortex formed after aeration, the suspended organic matter in the water comes into contact with each other. Because there is a lot of viscous suspended organic matter in the aquaculture water, the suspended organic matter in the water eventually adheres together under the action of the vortex. Large-diameter suspended organic matter flocs are formed in the dead vortex area of ​​the vortex. When the vortex can no longer support the movement of the large-diameter suspended organic matter flocs, they settle down and are deposited on the sedimentation plate 10 at the bottom of the collector. When a certain amount has been deposited, the water pump connected to the hard sediment extraction pipe 4 is turned on to precipitate the suspended organic matter flocs.

[0060] In a preferred embodiment, the process of calculating the change in suspended solids content in the aquaculture pond through the collection and control module includes:

[0061] The pressure difference obtained by the pressure sensor 19 at different time periods is calculated, and the change in the content of suspended solids is expressed by the pressure difference; a change threshold is set according to the water purification requirements, and when the pressure difference is less than the change threshold, the air compressor is controlled to stop running.

[0062] Furthermore, the method for calculating the suspended solids content is as follows:

[0063]

[0064] Where C represents the concentration of suspended solids in the suspended solids collector, A represents the pressure value detected by the pressure sensor at time a, B represents the pressure value detected by the pressure sensor at time b, and V represents the volume of water that the suspended solids collector can hold.

[0065] In a preferred embodiment, during the collection of suspended solids, a modifier is released into the sedimentation pan 10 to modify the suspended particles in the sedimentation pan; the modifier comprises alumina, iron oxide, silicate and aluminate.

[0066] Understandably, this invention optimizes the internal structure of the suspended solids collector, utilizing the vortex effect of high-pressure gas to effectively collect suspended solids in the aquaculture pond. This helps maintain stable water quality, reduces energy consumption, and increases dissolved oxygen in the water, achieving energy-saving and emission-reducing green aquaculture. Real-time monitoring of the turbidity and concentration of suspended solids allows for automatic control of the collector's start and stop based on the monitoring results, effectively preventing abnormal operating conditions in the pond and extending the service life of the aquaculture pond and related equipment. The system employs automated control, reducing the workload of factory operators and facilitating comprehensive management of different aquaculture ponds. Furthermore, during the collection process, the suspended solids are modified using metal oxides and organic compounds, making them hydrophobic, further improving the collection efficiency.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The methods disclosed in the embodiments are described simply because they correspond to the systems disclosed in the embodiments; relevant details can be found in the method section.

[0068] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. All should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A suspended solids collection system for wastewater from factory-scale aquaculture ponds, characterized in that, Includes suspended solids detection device, collection control module, air compressor, and suspended solids collector; The suspended solids detection device is used to detect the turbidity of the water in the aquaculture pond and the pressure value in the suspended solids collector. The collection control module is used to control the start and stop of the air compressor according to the turbidity of the water and the pressure changes in the suspended solids collector at different times. The air compressor is used to collect suspended solids in the water of the aquaculture pond into the suspended solids collector. The suspended matter collector is used to extract suspended matter; The suspended solids collector includes an aeration device, a water flow guiding device, and an organic floc sediment extraction device; the aeration device is located in the lower middle part of the water flow guiding device, and the organic floc sediment extraction device is located inside the water flow guiding device. The aeration device delivers high-pressure gas generated by the air compressor to the water flow guiding device, which in turn drives the water flow out from above the water flow guiding device, causing suspended solids in the water flow to accumulate in the sedimentation tray; the organic floc sedimentation extraction device then extracts the suspended solids. The suspended solids detection device includes a sensor assembly; the sensor assembly includes a turbidity meter and a pressure sensor, the turbidity meter is disposed on both sides of the bottom sedimentation plate of the water flow guiding device, and the pressure sensor is disposed in the middle of the bottom sedimentation plate of the water flow guiding device; the turbidity of the water in the aquaculture pond is detected by the turbidity meter, and the water pressure at the bottom of the sedimentation plate is detected by the pressure sensor; The collection control module controls the operation or shutdown of the system based on the water turbidity obtained by the turbidity meter. When the water turbidity exceeds the preset turbidity value, the collection control module controls the air compressor to start running. During the collection of suspended solids, the collection control module calculates the pressure difference of the pressure sensor over different time periods, and uses the pressure difference to represent the change in the content of suspended solids; the collection control module sets a change threshold according to the water purification requirements, and when the pressure difference is less than the change threshold, it controls the air compressor to stop running; The water flow guiding device is also equipped with a suspended solids modification device, which includes a modifier. During the suspended solids collection process, the suspended solids modification device releases the modifier onto the aggregated suspended solids to modify the particles within the suspended solids. The modifier comprises alumina, iron oxide, silicate, and aluminate. The method for calculating the suspended solids content is as follows: Where C represents the concentration of suspended solids in the suspended solids collector, A represents the pressure value detected by the pressure sensor at time a, B represents the pressure value detected by the pressure sensor at time b, and V represents the volume of water that the suspended solids collector can hold.

2. A method for collecting suspended solids using the suspended solids collection system according to claim 1, characterized in that, Includes the following steps: The turbidity of the water in the aquaculture pond is obtained by a suspended solids detection device. When the turbidity of the water exceeds the preset turbidity value, the air compressor is started and the suspended solids are collected by the suspended solids collector. During the suspended solids collection process, the collection control module calculates the change in the content of suspended solids in the aquaculture pond. When the change in the content of suspended solids is less than the change threshold, the air compressor is controlled to stop running, thus ending the suspended solids collection process.

3. The suspended solids collection method according to claim 2, characterized in that, During the collection of suspended solids, the air compressor is started to deliver high-pressure gas to the suspended solids collector. The high-pressure gas forms a local vortex through the gas guide cone inside the suspended solids collector, which drives the water flow through the water inlet into the water flow guide device below. Under the shearing action of the vortex, the water flows out from the top of the water flow guide device, causing the suspended solids in the water flow to accumulate in the sedimentation pan at the bottom of the suspended solids collector. The suspended solids are extracted using an organic floc deposition extraction device in the suspended solids collector.

4. The suspended solids collection method according to claim 2, characterized in that, The process of calculating changes in suspended solids content in the aquaculture pond using the collection and control module includes: The pressure difference obtained by the pressure sensor at different time periods is calculated, and the change in the content of suspended solids is expressed by the pressure difference; a change threshold is set according to the water purification requirements, and when the pressure difference is less than the change threshold, the air compressor is controlled to stop running.

5. The suspended solids collection method according to claim 4, characterized in that, During the collection of suspended solids, a modifier is released into the sedimentation pan to modify the suspended particles in the sedimentation pan; the modifier comprises alumina, iron oxide, silicate and aluminate.

Images