Automatic microstrainer wastewater recovery device and use method thereof

Abstract

The invention relates to an automatic microstrainer waste water recovery device and a using method thereof.The recovery device comprises a microstrainer, a buffer water tank, a filtering sand box, a controller, a blow-off pipeline and a backwashing pipeline, sewage of the microstrainer is communicated with the buffer water tank through a sewage collecting pipe, and a liquid level sensor is arranged in the buffer water tank; the liquid level sensor is used for monitoring the liquid level height in the buffer water tank and sending a signal to the controller, the buffer water tank is communicated to a water inlet of the filter sand box through the water pump, a water outlet of the filter sand box is provided with a first electric control valve and a second electric control valve in parallel, and the second electric control valve is communicated with a backwashing pipeline; the water inlet of the filtering sand box is further communicated with a blow-off pipeline through a third electric control valve, and the controller controls starting and stopping of the water pump and controls opening and closing of the first electric control valve, the second electric control valve and the third electric control valve. According to the invention, secondary recycling is carried out on the wastewater discharged by the microstrainer, so that the waste of water resources is obviously reduced, and the use efficiency of factory circulating water is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aquaculture, and in particular relates to an automated microfiltration wastewater recovery device and a use method thereof. Background Art

[0002] In traditional factory-scale recirculating aquaculture systems, microfilters are responsible for filtering fish feces and suspended impurities in the water. However, as the aquaculture density increases, the accumulation of organic matter such as fish feces accelerates, resulting in the need for frequent backwashing of the microfilter to maintain its filtering efficiency. For example, a microfilter with a processing capacity of 80 tons / hour can consume up to 4 tons of water per day due to backwashing. The discharged wastewater not only represents a large loss of water resources, but also creates an unnecessary burden on the environment. Summary of the invention

[0003] In view of this, the purpose of the present invention is to address the deficiencies in the prior art and provide an automated microfiltration wastewater recovery device and a method of use thereof, which significantly reduces water resource waste and improves the efficiency of factory circulating water use by secondary recycling of wastewater discharged from the microfiltration machine.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An automated microfilter wastewater recovery device comprises a microfilter, a buffer water tank, a filter sand box, a controller, a sewage discharge pipeline and a backwash pipeline. The sewage of the microfilter is connected to the buffer water tank through a sewage collecting pipe. A liquid level sensor is arranged in the buffer water tank. The liquid level sensor is used to monitor the liquid level height in the buffer water tank and send a signal to the controller. The buffer water tank is connected to the water inlet of the filter sand box through a water pump. An electric control valve 1 and an electric control valve 2 are arranged in parallel at the water outlet of the filter sand box. The electric control valve 2 is connected to the backwash pipeline. The water inlet of the filter sand box is also connected to the sewage discharge pipeline through the electric control valve 3. The controller controls the start and stop of the water pump and controls the switching of the electric control valve 1, the electric control valve 2 and the electric control valve 3.

[0006] In order to better implement the present invention, further optimization is made in the above structure, the bottom of the buffer water tank is a conical structure, and the water pump is connected to the bottom of the buffer water tank.

[0007] In order to better implement the present invention, further optimization is made in the above structure, and a one-way valve is arranged between the buffer water tank and the water pump.

[0008] In order to better realize the present invention, further optimization is made in the above structure, and the liquid level sensor includes a high-level sensor arranged at the top of the buffer water tank and a low-level sensor arranged at the bottom of the buffer water tank.

[0009] In order to better realize the present invention, further optimization is made in the above structure, and the buffer water tank is made of PE polyethylene material.

[0010] In order to better implement the present invention, further optimization is made in the above structure, and the controller is a PLC controller.

[0011] In order to better implement the present invention, further optimization is made in the above structure, and the electric control valve 1 is connected to the microfilter.

[0012] A method for using the above-mentioned automated microfiltration wastewater recovery device comprises the following steps:

[0013] When the liquid level height monitored by the liquid level sensor rises to a first threshold value, the controller receives a signal and controls the water pump to start, the electric control valve 1 to open, and the electric control valve 2 and the electric control valve 3 to close;

[0014] When the liquid level height monitored by the liquid level sensor drops to a second threshold, the controller receives a signal and controls the water pump to stop, and at the same time a counting module in the controller counts once;

[0015] When the counting module counts N times, the controller controls the electric control valve 1 to close, and the electric control valves 2 and 3 to open. After a certain delay, the controller controls the electric control valves 2 and 3 to close, and the count of the counting module is reset.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The automated microfilter wastewater recovery device provided by the present invention continuously collects the wastewater discharged by the backwashing of the microfilter. When the wastewater reaches a certain amount, it is automatically filtered through the filter sand box under the control of the controller. The filtered clean water can continue to be recycled, thus realizing the secondary recycling of water resources. Moreover, the filter sand box is also equipped with a backwashing system to regularly clean the filter sand box, effectively reducing the discharge of wastewater. The amount of wastewater is reduced by about 80% after use.

[0018] 2. The method of using the automated microfiltration wastewater recovery device provided by the present invention controls the cleaning time of the filter sand box in conjunction with the number of times the sewage is filtered. After the number of filtrations reaches the set value, the controller automatically controls the opening and closing of related valves, thereby realizing automatic cleaning of the filter sand box. The entire filtration and backwashing process is fully automated and does not require human intervention. This not only realizes the fine automated management of the filter sand box filtration equipment, but also significantly reduces the amount of wastewater generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the automated microfiltration wastewater recovery device of the present invention.

[0021] In the figure:

[0022] 1-microfiltration machine, 2-buffer water tank, 3-filter sand box, 4-controller, 5-drainage pipeline, 6-backwash pipeline, 7-sewage collecting pipe, 8-liquid level sensor, 9-water pump, 10-electrically controlled valve 1, 11-electrically controlled valve 2, 12-electrically controlled valve 3, 13-check valve. DETAILED DESCRIPTION

[0023] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Please refer to Figure 1The automated microfilter wastewater recovery device provided by the present invention comprises a microfilter 1, a buffer water tank 2, a filter sand box 3, a PLC controller 4, a sewage pipe 5 and a backwash pipe 6. The sewage of the microfilter 1 is connected to the buffer water tank 2 through a sewage collecting pipe 7. The buffer water tank 2 is provided to collect the wastewater generated by the backwashing of the microfilter 1 each time, so as to facilitate unified treatment when a certain amount is accumulated. The bottom of the buffer water tank 2 is a conical structure, and the water pump 9 is connected to the bottom of the buffer water tank 2, so that the impurities accumulated at the bottom of the buffer water tank 2 can automatically gather to the center under the suction action of the water pump 9, so as to avoid the accumulation of impurities such as fish feces in the corners and unable to be cleaned, so as to further pollute the water quality. A one-way valve 13 is provided between the buffer water tank 2 and the water pump 9 to prevent the backwash sewage from flowing back into the buffer water tank 2. The buffer water tank 2 is made of PE polyethylene material, which has excellent performance such as heat resistance, frost resistance and corrosion resistance.

[0027] A liquid level sensor 8 is provided in the buffer water tank 2. The liquid level sensor 8 is used to monitor the liquid level height in the buffer water tank 2 and send a signal to the controller 4. The liquid level sensor 8 includes a high-level sensor provided at the top of the buffer water tank 2 and a low-level sensor provided at the bottom of the buffer water tank 2. When the water level in the buffer water tank 2 reaches the top or the bottom, the corresponding sensors will be triggered respectively, and the corresponding liquid level height signal will be sent to the controller 4. The buffer water tank 2 is connected to the water inlet of the filter sand box 3 through the water pump 9. When the sewage in the buffer water tank 2 accumulates to a certain amount, the sewage inside is pressurized and transported to the filter sand box 3 for filtration through the water pump 9. The water outlet of the filter sand box 3 is provided with an electric control valve 10 and an electric control valve 2 11 in parallel. The electric control valve 10 is connected to the microfilter 1, so that the filtered clean water re-enters the microfilter 1 for recycling, thereby realizing the secondary recycling of water resources. The electric control valve 2 11 is connected to the backwash pipeline 6, and the water inlet of the filter sand box 3 is also connected to the sewage pipeline 5 through the electric control valve 3 12. The backwash pipeline 6 and the sewage pipeline 5 form a backwash system of the filter sand box 3, and the filter sand box 3 is regularly cleaned. The controller 4 controls the start and stop of the water pump 9, and controls the switch of the electric control valve 1 10, the electric control valve 2 11 and the electric control valve 3 12. By controlling the water pump 9, the electric control valve 1 10, the electric control valve 2 11 and the electric control valve 3 12, the automatic filtering of the sewage of the microfilter 1 and the backwash cleaning of the filter sand box 3 are realized.

[0028] The present invention also provides a method for using the above-mentioned automated microfiltration wastewater recovery device, comprising the following steps:

[0029] During normal use, the sewage in the microfilter 1 continuously enters the buffer water tank 2. When the liquid level monitored by the liquid level sensor 8 rises to the first threshold, that is, when the water level reaches the top of the buffer water tank 2, the high-level sensor will be triggered, and the high-level sensor will send a corresponding liquid level height signal. The controller 4 receives the signal and controls the water pump 9 to start, the electric control valve 10 to open, and the electric control valve 2 11 and the electric control valve 3 12 to close. At this time, the entire device starts the sewage filtration process. The sewage in the buffer water tank 2 is pressurized by the water pump 9 and enters the filter sand box 3 for filtration. The filtered clean water re-enters the microfilter 1 through the electric control valve 10 for recycling, realizing the secondary recycling of water resources.

[0030] When the liquid level monitored by the liquid level sensor 8 drops to the second threshold, that is, when the water level drops to the bottom of the buffer water tank 2, the low-level sensor will be triggered, and the low-level sensor will send a corresponding liquid level signal. The controller 4 receives the signal and controls the water pump 9 to stop, and the counting module in the controller 4 counts once. At this time, the sewage in the buffer water tank 2 is basically drained, the water pump 9 also stops working, and the buffer water tank 2 continues to collect sewage discharged by the microfiltration machine 1.

[0031] When the counting module counts N times (the number of counts can be set according to the dirtiness of the aquaculture pond), a large amount of impurities such as fish feces are also accumulated in the filter sand box 3, and the filtering effect becomes poor, so it is necessary to start backwashing and cleaning. At this time, the controller 4 controls the electric control valve 1 10 to close, the electric control valve 2 11 and the electric control valve 3 12 to open, the filtering function is closed, the backwashing pipeline 6 and the sewage pipeline 5 are connected to form the backwashing system of the filter sand box 3, and the filter sand box 3 is cleaned. After a certain delay, the impurities in the filter sand box 3 are cleaned, and then the controller 4 controls the electric control valve 2 11 and the electric control valve 3 12 to close, the backwashing system is closed, and the counting module counts are reset to zero, waiting for the next round of filtering and backwashing cycles.

[0032] This application significantly reduces the amount of wastewater generated by secondary utilization of the wastewater from the microfilter 1. Taking a microfilter with a flow rate of 80 tons as an example, the daily wastewater generated can reach 4 tons when the recovery device is not installed; after the wastewater recovery device is installed, the amount of wastewater can be reduced by about 80%. This device not only realizes the full automation of the backwashing process of the filtration equipment, but also effectively reduces cost expenditure, providing strong support for the sustainable development of the aquaculture industry.

[0033] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An automated microfiltration wastewater recovery device, characterized in that: The invention comprises a microfilter (1), a buffer water tank (2), a filter sand box (3), a controller (4), a sewage discharge pipeline (5) and a backwash pipeline (6); sewage from the microfilter (1) is connected to the buffer water tank (2) via a sewage collecting pipe (7); a liquid level sensor (8) is arranged in the buffer water tank (2); the liquid level sensor (8) is used to monitor the liquid level in the buffer water tank (2) and send a signal to the controller (4); the buffer water tank (2) is connected to the backwashing pipeline (6) via a water pump (9); The water inlet of the filter sand box (3) and the water outlet of the filter sand box (3) are provided with an electric control valve 1 (10) and an electric control valve 2 (11) in parallel, the electric control valve 2 (11) is connected to the backwash pipeline (6), and the water inlet of the filter sand box (3) is also connected to the sewage pipeline (5) through the electric control valve 3 (12). The controller (4) controls the start and stop of the water pump (9) and controls the switch of the electric control valve 1 (10), the electric control valve 2 (11) and the electric control valve 3 (12).

2. The automated microfiltration wastewater recovery device according to claim 1, characterized in that: The bottom of the buffer water tank (2) is a conical structure, and the water pump (9) is connected to the bottom of the buffer water tank (2).

3. The automated microfiltration wastewater recovery device according to claim 2, characterized in that: A one-way valve (13) is provided between the buffer water tank (2) and the water pump (9).

4. The automated microfiltration wastewater recovery device according to claim 3, characterized in that: The liquid level sensor (8) comprises a high-level sensor arranged at the top of the buffer water tank (2) and a low-level sensor arranged at the bottom of the buffer water tank (2).

5. The automated microfiltration wastewater recovery device according to claim 4, characterized in that: The buffer water tank (2) is made of PE polyethylene material.

6. The automated microfiltration wastewater recovery device according to claim 1, characterized in that: The controller (4) is a PLC controller.

7. The automated microfiltration wastewater recovery device according to claim 1, characterized in that: The electric control valve 1 (10) is connected to the microfilter (1).

8. A method for using the automated microfiltration wastewater recovery device as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: When the liquid level height monitored by the liquid level sensor (8) rises to a first threshold value, the controller (4) receives a signal and controls the water pump (9) to start, the electric control valve 1 (10) to open, and the electric control valve 2 (11) and the electric control valve 3 (12) to close; When the liquid level height monitored by the liquid level sensor (8) drops to a second threshold value, the controller (4) receives a signal and controls the water pump (9) to stop, and at the same time a counting module in the controller (4) counts once; When the counting module counts N times, the controller (4) controls the electric control valve 1 (10) to close, and the electric control valve 2 (11) and the electric control valve 3 (12) to open. After a certain delay, the controller (4) controls the electric control valve 2 (11) and the electric control valve 3 (12) to close, and the count of the counting module is reset.

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