KR102264042B1 - Circulaion type waste nutrient solution reuse system - Google Patents

Abstract

The present invention relates to a circulation type nutrient solution reuse system, and more particularly, to a circulation type nutrient solution reuse system that can be recycled after purifying the drainage solution discharged from a cultivation area.
The circulating nutrient solution reuse system according to the present invention is a circulating nutrient solution reuse system, comprising: a drainage storage tank in which drainage discharged from a cultivation area is stored; a pressure pump for sucking the drainage stored in the drainage reservoir and pumping it through a drainage supply line; a turbidity treatment tank having a built-in treatment agent to perform a filtration process of the inflowing liquid by being pressurized by the pressure-feeding pump; a backwashing device connected to the drainage supply line and performing a backwashing process by pumping the drainage toward the turbidity treatment tank; a drainage sterilization module arranged to perform a sterilization process of the drainage discharged from the turbidity treatment tank; and a purified nutrient solution storage tank arranged to store the purified nutrient solution discharged through the purified nutrient solution discharge line after passing through the drainage sterilization module.

Description

Circulating Nutrient Solution Reuse System {CIRCULAION TYPE WASTE NUTRIENT SOLUTION REUSE SYSTEM}

The present invention relates to a circulation type nutrient solution reuse system, and more particularly, to a circulation type nutrient solution reuse system that can be recycled after purifying the drainage solution discharged from a cultivation area.

In general, cultivation of crops in the open field was common, but the facility horticultural industry is gradually expanding as a way to reduce uncertainty due to abnormal temperatures and to meet consumers' year-round demand.

In facility horticulture, plants are planted on a medium mounted on a medium frame constructed inside a greenhouse such as a glass greenhouse or a plastic greenhouse, supplying nutrient solution, and managing the environment to maintain conditions such as temperature, humidity, etc. that are ideal for growing crops. carry out the cultivation process.

And, in facility horticulture, plants are mainly grown using nutrient solution. In order to move the nutrient solution to the plants, plants are planted in a solid medium such as top soil, rock wool, peat moss, vermiculite, and coco peat, and the nutrient solution is supplied to the medium to grow plants. method is being used

Nutrient solution is a solution of fertilizer, etc. dissolved in water, and after being supplied to the medium of the cultivation area and used for cultivation, about 30% or more is discharged as drainage.

As such, as the nutrient solution necessary for plant growth is discharged as drainage, the consumption of the nutrient solution increases, resulting in an increase in agricultural costs, and since the drainage contains a large amount of nitrogen and phosphorus components, there is a disadvantage of causing serious water pollution during discharge.

Accordingly, in the field of facility horticulture using nutrient solution, there is an urgent need for a nutrient solution reuse system that can recycle the drained solution discharged as waste nutrient solution.

Korean Patent Registration No. 10-1049202 "Method of Reusing Waste Nutrient Solution for Agricultural Water" Korean Patent Registration No. 10-0542458 "A device and method for treating nitrogen and phosphorus in organic wastewater and its operation method"

The present invention has been proposed in view of the above, and an object of the present invention is to provide a circulation type nutrient solution reuse system that can be recycled after purifying the drainage solution discharged from the cultivation area.

Another object of the present invention is to provide a circulating type nutrient solution reuse system that has a simple and simple structure and allows the backwashing process to be performed using drainage.

Another object of the present invention is to provide a circulating nutrient solution reuse system capable of selectively performing a purification process according to the type of medium used in the cultivation area or the condition of drainage.

Another object of the present invention is to provide a circulation type nutrient solution reuse system that can effectively perform a nutrient solution purification process by enabling the drainage sterilization module to be cleaned effectively.

In order to achieve the above object, the circulating nutrient solution reuse system according to the present invention is a circulating nutrient solution reuse system, comprising: a drainage storage tank in which drainage discharged from a cultivation area is stored; a pressure pump for sucking the drainage stored in the drainage reservoir and pumping it through a drainage supply line; a turbidity treatment tank having a built-in treatment agent to perform a filtration process of the inflowing liquid by being pressurized by the pressure pump; a backwashing device connected to the drainage supply line and performing a backwashing process by pumping the drainage toward the turbidity treatment tank; a drainage sterilization module arranged to perform a sterilization process of the drainage discharged from the turbidity treatment tank; and a purified nutrient solution storage tank arranged to store the purified nutrient solution discharged through the purified nutrient solution discharge line after passing through the drainage sterilization module.

In order to achieve the above object, in the circulating nutrient solution reuse system according to the present invention, a filtrated nutrient solution discharge line through which the drainage through the turbidity treatment tank flows is connected, and an organic material removal process is performed to remove the organic material contained in the drained solution. It further comprises an organic matter treatment tank for discharging through the, so that the organic matter removal process can be selectively performed, a selective pipe provided to supply the drainage that has passed through the turbidity treatment tank to the drainage sterilization module without going through the organic matter treatment tank may include wealth.

The selective piping unit may include: a selective piping line connected between the filtered nutrient solution discharge line and the organic matter removal nutrient solution discharge line; a treatment selection control valve installed in the selection piping line to control the flow of drainage; a first shut-off valve installed in the filtered nutrient solution discharge line so that drainage flows to the selective piping line; and a second shut-off valve installed in the organic matter removal nutrient solution discharge line so that the drain does not flow into the organic matter treatment tank.

The backwash device may include: a first backwash water supply line connected to the drainage supply line to supply drainage to the turbidity treatment tank; a first backwash water recovery line connected between the drainage tank and the turbidity treatment tank and supplied to the turbidity treatment tank to recover the drainage solution used for backwashing; a second backwash water supply line connected to the first backwash water supply line to supply drainage to the organic matter treatment tank; a second backwash recovery line connected to the organic material treatment tank and the first reverse body spinal water recovery line and supplied to the organic material treatment tank to recover drainage used for backwashing; and backwashing control for supplying drainage to the first backwash water supply line and the second backwashing water supply line during backwashing of the turbidity treatment tank and the organic matter treatment tank, and performing an opening/closing operation so that the drain solution used for backwashing is recovered It may include a valve unit.

The first backwash water supply line is connected between the drainage supply line and the filtered nutrient solution discharge line, and the second backwash water supply line is connected between the first backwash water supply line and the organic matter removal nutrient solution discharge line. can be

The backwash control valve unit is installed in the drainage supply line to supply drainage to the first backwash water supply line during backwashing of the turbidity treatment tank and open and close so that the drainage used for backwashing is recovered to the drainage storage tank 1 backwash control valve unit; A second backwash control valve installed in the nutrient solution discharge line and the first backwash water supply line to open and close so that the drain flowing into the first backwash water supply line is supplied to the turbidity treatment tank during backwashing of the turbidity treatment tank part; a third backwash control valve unit that opens and closes so that the drain used for backwashing of the organic matter treatment tank is recovered to the drain storage tank via the second backwash recovery line; and a fourth backwash control valve that opens and closes so that the drain flowing into the second backwash water supply line is supplied to the organic matter treatment tank during backwashing of the organic matter treatment tank.

The first backwash control valve unit may be configured as a first backwash water control three-way valve connected to the drainage supply line passing through a connection branch point with the first backwash water supply line and to which the first backwash water recovery line is connected. have.

The second backwash control valve unit may be configured as a second backwash water control three-way valve connected to a connection portion between the filtrate nutrient solution discharge line and the first backwash water supply line.

The third backwash control valve unit may be configured as a third backwash water control three-way valve connected to the filtrate nutrient solution discharge line in contact with the second backwash control valve unit to be connected to the second backwash water recovery line.

The fourth backwash control valve unit may include a fourth backwash water control three-way valve installed in the organic matter removal nutrient solution discharge line in contact with the organic matter treatment tank and connected to the second backwash water supply line.

On the other hand, the circulation type nutrient solution reuse system according to the present invention includes a control unit for controlling the operation of the pressure pump and the backwash control valve unit; and a flow meter installed in the drainage supply line, wherein the control unit calculates the linear velocity of the drainage solution moving in the turbidity treatment tank and the organic matter treatment tank during backwashing based on the signal applied from the flow meter A linear velocity calculation unit may be provided, and the pressure feeding pump may be controlled to move the drain at a preset linear velocity by comparing the linear velocity calculated from the linear velocity calculating unit with a preset linear velocity.

In addition, the circulation type nutrient solution reuse system according to the present invention includes an input unit for inputting a driving time of the pressure pump, a purification mode for performing a purification process of the drainage, and a backwashing mode for performing a backwashing process using the drainage. Further, the control unit may control driving of the pressure feeding pump and the backwash control valve unit according to a signal from the input unit.

In the drainage sterilization module, at least one of a UV lamp sterilizer and a UVC LED sterilizer connected to the organic matter removal nutrient solution discharge line may be installed.

In this case, the UV lamp sterilizer may be formed in a structure in which a UV lamp is provided in a sterilization pipe through which drainage is moved, and a scale removal unit for removing scale formed in the UV lamp sterilizer may be provided.

The scale removing unit may include: a detergent supply unit connected to the organic matter removal nutrient solution discharge line to supply the detergent to the sterilization pipe; a first cleaning agent circulation line having one end connected to the purified nutrient solution discharge line and the other end connected to the drainage supply line in front of the pressure-feeding pump to circulate the drainage solution containing the cleaning agent; a second cleaning agent circulation line having one end connected to the drainage supply line at the rear end of the pressure pump and the other end connected to the organic matter removal nutrient solution discharge line to circulate the drainage solution containing the cleaning agent; And it may include a detergent circulation control valve that opens and closes to form a flow path through which the drain containing the detergent is circulated to the first detergent circulation line and the second detergent circulation line when the scale removal process is performed.

The cleaning agent circulation control valve unit may include a first cleaning agent installed at a connection portion between the purified nutrient solution discharge line and the first cleaning agent circulation line so that the drainage solution including the cleaning agent passed through the drainage sterilization module flows to the first cleaning agent circulation line. control valve; a second detergent control valve installed in the drainage supply line corresponding to the front of the connection portion between the first detergent circulation line and the drainage supply line; a third detergent control valve installed in the first detergent circulation line close to the connection portion of the first detergent circulation line and the drainage supply line; a fourth detergent control valve installed at a connection portion between the second detergent circulation line and the drainage supply line; and a fifth detergent control valve connected to the organic matter removal nutrient solution discharge line corresponding to the front of the connection portion of the second detergent circulation line.

The scale removing unit may include: a drain line connected to the first detergent circulation line and having a first branch line disposed toward the drainage storage tank and a second branch line disposed toward the discharge tank; a three-way valve for drain direction control which is installed in the branch of the first branch line and the second branch line to control the flow direction of the drain containing the cleaning agent; and a sixth cleaning agent control valve for intermittent inflow of the drain containing the cleaning agent into the drain line.

According to the circulation type nutrient solution reuse system according to the present invention, since the drainage solution discharged from the cultivation area can be purified and recycled, the required amount of the nutrient solution can be reduced, thereby reducing farming costs, and containing a large amount of components such as nitrogen and phosphorus. Water pollution can be prevented by not discharging the drained water.

According to the circulation type nutrient solution reuse system according to the present invention, since the backwashing process of the turbidity treatment tank and the organic matter treatment tank is performed using the wastewater to be purified, a separate washing water for backwashing is not required, thereby reducing the purification cost. and there is no need to purify wastewater used for backwashing as in the prior art, thereby reducing operating costs.

In addition, the backwashing device can be implemented simply and simply by adding a valve and a simple pipe to the turbidity treatment tank and the organic matter treatment tank, so that it is a complex device (e.g., a backwash pump, a backwash water storage tank, Air compressor, various valves, etc.) are not required, so there are advantages of reducing the installation area, reducing equipment and operating costs, and reducing maintenance costs because there are few elements of failure and shortening of downtime.

In addition, according to the circulation type nutrient solution reuse system according to the present invention, the treatment process by the turbidity treatment tank and the organic matter treatment tank can be selected according to the type of medium used in the cultivation area or the condition of drainage, so that the purification process can be performed quickly by reducing the purification load can be carried out and has the advantage of reducing the purification cost.

In addition, according to the circulation type nutrient solution reuse system according to the present invention, there is an advantage in that the sterilization efficiency can be improved by removing the scale formed in the drainage sterilization module, thereby stably performing the purification action of the drainage.

1 is a schematic configuration diagram for explaining the technical idea of a circulating nutrient solution reuse system according to a first embodiment of the present invention;
2 is a block diagram showing the overall configuration of the circulating nutrient solution reuse system according to the first embodiment of the present invention;
3A and 3B are partially enlarged views of FIG. 2 . FIG. 3A is an enlarged view of a part of the purification process of the drainage, and FIG. 3B is an enlarged view of a part of the sterilization process of the drainage.
4 is a block diagram for explaining a circulating nutrient solution reuse system according to a first embodiment of the present invention;
5 is a flowchart for explaining the backwashing method of the circulating nutrient solution reuse system according to the first embodiment of the present invention;
6a and 6b are views for explaining the purification process and backwashing process of the circulating nutrient solution reuse system according to the present invention;
7 is a view for explaining an example in which the treatment by the organic matter treatment tank is omitted in the purification process of the circulating nutrient solution reuse system according to the present invention;
8 is a view for explaining the scale removal process of the drainage sterilization module in the purification process of the circulating nutrient solution reuse system according to the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

On the other hand, in each drawing, a detailed description of a configuration that can be easily recognized by a person skilled in the art from the general technique and an action and effect thereof will be simplified or omitted. In addition, since the present invention is characterized by a circulation type nutrient solution reuse system, the related parts will be mainly illustrated and described, and the description of the remaining parts will be simplified or omitted.

1 is a schematic configuration diagram for explaining the technical idea of a circulating nutrient solution reuse system according to a first embodiment of the present invention, and FIG. 2 is an overall configuration of a circulating nutrient solution reuse system according to a first embodiment of the present invention. 3A and 3B are partially enlarged views of FIG. 2 . FIG. 3A is an enlarged view of a part of the purification process of drainage, and FIG. 3B is an enlarged view of a part of the sterilization process of the drainage.

Referring to Figure 1, the circulation type nutrient solution reuse system according to the first embodiment of the present invention is configured to purify and recycle the drainage solution discharged as drainage after use in the plantation area (h) of facility horticulture using the nutrient solution. Storage tank (1), pressure pump (2), turbidity treatment tank (3), organic matter treatment tank (4), backwashing device (5), drainage sterilization module (6), purified nutrient solution storage tank (7), and purified nutrient solution supply unit (8) is provided.

The drainage storage tank 1 may be composed of a container or a tank in which the drainage discharged from the cultivation area (h) is stored, and an inflow line for inflow of the drainage is connected to the upper part of the drainage storage tank, and cleaning or maintenance is performed. A drain line 12 for the installation is installed.

The pressure pump 2 is a pump that sucks the drainage stored in the drainage tank 1 and pumps it through the drainage supply line 22, and can be configured as a one-way pump capable of supplying drainage only in the direction of the purified nutrient solution storage tank 7, but , In this embodiment, it is composed of a forward/reverse driving pump capable of performing a pumping action not only in the forward direction of the purified nutrient solution storage tank, but also in the reverse direction of the drainage storage tank 1 direction.

And the pressure pump 2 is composed of a pump body having an impeller built therein, and a general pump having a motor for rotating the impeller, and the motor is composed of an inverter motor to increase or decrease the pumping flow rate.

The turbidity treatment tank 3 is a turbidity filtration device (MMF: Multi Media Filter). Here, sand is filled as the filter medium to form the filter layer 33 .

In addition, the turbidity treatment tank 3 is provided with a foreign material filtering member (not shown), such as a screen or filter for filtering out the solid foreign matter contained in the flowing drain.

The organic matter treatment tank 4 is composed of a container or tank in order to remove organic matter, etc. contained in the drainage solution passing through the turbidity treatment tank 3, and an activated carbon treatment tank (ACF) in which a treatment layer 43 is formed by an adsorbent such as activated carbon. : Activated Carbon Filter).

Here, the adsorbent can be typically applied to granules formed in the form of pellets of activated carbon so as to perform a purification action when the influent is introduced, but in addition to activated carbon, zeolite, diatomaceous earth, silica gel, etc. may be mixed.

In addition, the organic matter treatment tank 4 is connected to a filtrated nutrient solution discharge line 32 through which the drained solution through the turbidity treatment tank 3 flows, and performs an organic material removal process included in the drained organic material removal nutrient solution discharge line 42 . to be discharged through

On the other hand, the turbidity treatment tank 3 and the organic matter treatment tank 4 are provided with a selection pipe 44 to selectively perform the organic matter removal process.

The selective piping unit 44 is provided to directly supply the drainage that has passed through the turbidity treatment tank 3 to the drainage sterilization module 6 without going through the organic material treatment tank 4, and the medium in which the plants are grown is usually organic. In the case of coco pit medium containing , the purification process is performed while passing through both the turbidity treatment tank 3 and the organic matter treatment tank 4, but when the medium in which the plants are grown is a rock wool medium that does not contain organic matter, relatively organic matter Since the content of is low, the purification process is performed quickly by omitting the treatment by the organic matter treatment tank 4 to reduce the purification load.

In addition, the selective piping unit 44 is installed in the selective piping line 441 and the selective piping line 441 connected between the filtered nutrient solution discharge line 32 and the organic matter removal nutrient solution discharge line 42 to regulate the flow of drainage. treatment selection control valve 442, the first shut-off valve 443 installed in the filtered nutrient solution discharge line 32 so that the drainage flows to the selection piping line 441, and organic matter so that the drainage does not flow into the organic matter treatment tank 4 A second shut-off valve 444 installed in the removal nutrient solution discharge line 42 is provided.

Here, the treatment selection control valve 442 and the first and second shutoff valves 443 and 444 are configured as two-way valves having two fluid flow directions.

On the other hand, the backwashing device 5 is a component that is connected to the drainage supply line 22 and pressurizes the drainage toward the turbidity treatment tank 3 and the organic matter treatment vessel 4 to perform the backwashing process. A washing water supply line 51 , a first backwash water recovery line 52 , a second backwash water supply line 53 , a second backwash water recovery line 54 , and a backwash control valve unit 55 are provided. .

The first backwash water supply line 51 is a pipe for supplying the drainage of the drainage storage tank 1 to the lower part of the turbidity treatment tank 3 during backwashing. The drainage supply line 22 and the filtrate discharge line ( 32) are connected between them.

The first backwash recovery line 52 is a pipe through which the drainage solution used for backwashing is recovered by being supplied to the turbidity treatment tank 3 during backwashing, and is connected between the drainage storage tank 1 and the turbidity treatment tank 3 . to be.

The second backwash water supply line 53 is a pipe for supplying the drain from the drainage storage tank 1 to the lower portion of the organic material treatment tank 4 during backwashing. The first backwash water supply line 51 and the organic material removal nutrient solution It is connected between the discharge lines (42).

The second backwash water recovery line 54 is supplied to the organic material treatment tank 4 during backwashing and is a pipe through which the drain used for backwashing is recovered. The organic material treatment tank 4 and the first backwashing water recovery line 52 are is connected between

The backwash control valve unit 55 supplies the drain solution to the first backwash water supply line 51 and the second backwash water supply line 53 during backwashing of the turbidity treatment tank 3 and the organic matter treatment tank 4 . As a component that performs an opening/closing operation so that the drain used for backwashing is recovered via the first and second backwash recovery lines 52 and 54, the first to fourth backwash control valve units 551,552,553,554 Consists of.

The first backwash control valve unit 551 is installed in the drainage supply line 22 to supply drainage to the first backwash water supply line 51 during backwashing of the turbidity treatment tank 3 and used for backwashing. A valve that opens and closes to allow drainage to be recovered to the drainage reservoir (1), is connected to the drainage supply line (22) that has passed the connection branch point with the first backwash water supply line (51), and is connected to the first backwash water recovery line (52) It is composed of a three-way valve for controlling the first backwash water to which this is connected.

The second backwash control valve unit 552 is installed in the filtrate nutrient solution discharge line 32 and the first backwash water supply line 51 to perform backwashing of the turbidity treatment tank 3 in the first backwash water supply line 51 ), a valve that opens and closes so that the drainage solution flowing into the turbidity treatment tank is supplied to the turbidity treatment tank 3, and is connected to the connection part of the filtered nutrient solution discharge line 32 and the first backwash water supply line 51. It consists of a valve.

In the third backwash control valve unit 553, the drain used for backwashing of the organic matter treatment tank 4 passes through the second backwash water recovery line 54 and the first backwash water recovery line 52 to the drain storage tank ( A valve that opens and closes so as to be recovered by 1), and is connected to the filtrate nutrient solution discharge line 32 in contact with the second backwash control valve unit 552 and is connected to the second backwash water recovery line 54. A third backwash water control three It consists of a way valve.

The fourth backwash control valve unit 554 is a valve that opens and closes so that the drain flowing into the second backwash water supply line 53 is supplied to the organic matter treatment tank 4 during backwashing of the organic matter treatment tank 4 , It is installed in the organic matter removal nutrient solution discharge line 42 in contact with the organic matter treatment tank 4 and is composed of a fourth backwash water control three-way valve to which the second backwash water supply line 53 is connected.

Here, the first to fourth backwash control valve units 551 , 552 , 553 , and 554 are provided with an opening/closing member (not shown) disposed inside the valve body having three fluid passages, and when performing the purification process of drainage The drain is allowed to flow in the direction of the turbidity treatment tank 3 and the organic matter treatment tank 4, and when the backwashing process is performed, the drains flow into the first and second backwash water supply lines 51 and 53, and then the first and The flow is controlled to flow to the second backwash recovery lines 52 and 54 .

In addition, the first to fourth three-way valves 551, 552, 553, and 554 for backwashing water control can be configured as manual valves that operate the opening and closing members with a manual handle, but automatically open and close the opening and closing members when an electric signal is applied. It consists of an automatic three-way valve equipped with an actuator for actuation.

On the other hand, the circulating nutrient solution reuse system according to the present invention measures the flow rate of the drainage, so that the linear velocity of the drainage flowing inside the turbidity treatment tank 3 or the organic matter treatment tank 4 during backwashing can be calculated. ) is composed.

The flow meter 91 may be installed in the first backwash recovery line 52 or the second backwash recovery line 54 to measure the flow rate flowing out of the turbidity treatment tank 3 or the organic matter treatment tank 4 . However, in this embodiment, it is installed in the drainage supply line 22 so as to measure the flow rate of drainage used for backwashing.

Figure 4 is a block diagram for explaining the circulation type nutrient solution reuse system according to the first embodiment of the present invention.

4, the circulation type nutrient solution reuse system according to the present invention includes a control unit 91 for controlling the driving of the pressure pump 2 and the backwash control valve unit 55, an input unit 93 for inputting an input signal, A display unit 94, a memory unit 95, and the like, which display driving states of the pressure feeding pump 2 and the backwash control valve unit 55, are provided.

The control unit 91 controls the operation of the pressure feeding pump 2 and the backwash control valve unit 55 according to the signal from the input unit 93 , and performs turbidity treatment during backwashing based on a signal applied from the flowmeter 92 . A linear velocity calculating unit 96 is provided for calculating and calculating the linear velocity of the drain moving from the lower side to the upper side of the tank 3 and the organic matter treatment vessel 4, and the linear velocity calculating unit 96 is calculated from the linear velocity calculation unit 96. By comparing the linear speed with the preset linear velocity, the driving of the pressure feeding pump 2 is controlled so that the drain is moved at the preset linear velocity.

In addition, the input unit 93 includes buttons and a touch panel to input the driving time of the pressure pump 2, a purification mode for performing a purification process of drainage, a backwashing mode for performing a backwashing process using the drainage, and the like. It consists of etc.

On the other hand, the drainage sterilization module 6 is a component arranged to perform a sterilization process of the drainage flowing in after being discharged from the turbidity treatment tank 3, and the purified nutrient solution discharged from the drainage sterilization module 6 is discharged as a purified nutrient solution. After being moved to the purified nutrient solution storage tank 7 through the line 66, it is stored.

In addition, the drainage sterilization module 6 may install at least one of the UV lamp sterilizer 61 and the UVC LED sterilizer 62 connected to the organic matter removal nutrient solution discharge line 42, but in this embodiment, the UV lamp sterilizer 61 And the UVC LED sterilizer 62 is all arranged in a parallel structure.

The UV lamp sterilizer 61 and the UVC LED sterilizer 62 are installed in the sterilization line 63 arranged in parallel, and a sterilization line selection valve ( 64) is installed.

The UV lamp sterilizer 61 is formed in a structure in which a UV lamp is provided in a sterilization pipe path (not shown) through which the drainage is moved, and a protective quartz tube is disposed outside the UV lamp emitting UVC light having a wavelength of 100 to 280 nm. Since it is to select and install a UV lamp sterilizer for the piping, a description of the detailed configuration will be omitted.

The UVC LED sterilizer 62 is formed in a structure in which a UVC LED module is provided in a sterilization pipe path (not shown) through which drainage is moved, and a UVC LED module emitting UVC light of a wavelength of 100 to 280 nm is built-in UV for piping. Since the LED sterilizer is selected and installed, the detailed configuration will be omitted.

In addition, the UV lamp sterilizer 61 is cheaper by about 10% compared to the UVC LED sterilizer 62 and has excellent sterilization efficiency, but scale is easily formed while heat is emitted during operation. 65) is provided.

The scale removing unit 65 includes a detergent supply unit 651 connected to the organic matter removal nutrient solution discharge line 42 to supply the detergent to the sterilization pipe line, and the detergent supplied from the detergent supply unit 651 circulates the drainage solution. A cleaning circulation pipe portion 652 is provided.

The detergent supply unit 651 is composed of a detergent container 6511 containing a detergent mixed with 40% by volume of nitric acid and 60% by volume of water, and a detergent pump 6512 for pumping the detergent in the detergent container 6511.

The cleaning circulation pipe part 652 has one end connected to the purified nutrient solution discharge line 66 via the drainage sterilization module 6, and the other end is connected to the drainage supply line 22 of the front end of the pressure feeding pump 2 to supply the cleaning agent. One end is connected to the drainage supply line 22 at the rear end of the first detergent circulation line 6521 through which the drainage solution is circulated, and the other end is connected to the organic matter removal nutrient solution discharge line 42, and the cleaning agent is included. A second detergent circulation line 6522 through which the drainage is circulated, and a flow path through which the drainage containing the detergent is circulated to the first detergent circulation line 6521 and the second detergent circulation line 6522 when the scale removal process is performed is formed. It is composed of a detergent circulation control valve unit 653 that is opened and closed to do so.

The detergent circulation control valve unit 653 includes first to fifth detergent control valves 6531 , 6532 , 6533 , 6534 , and 6535 .

The first detergent control valve 6531 has a purified nutrient solution discharge line 66 and a first detergent circulation line 6521 such that the drainage solution containing the detergent passed through the drainage sterilization module 6 flows to the first detergent circulation line 6521 . ) is composed of a three-way valve installed at the connection part.

The second detergent control valve 6532 is a two-way valve installed at the connection portion of the drainage supply line 22 corresponding to the front of the connection portion of the first cleaning agent circulation line 6521 and the drainage supply line 22. .

The third detergent control valve 6533 is composed of a two-way valve installed in the first detergent circulation line 6521 close to the connection portion of the first detergent circulation line 6521 and the drainage supply line 22 .

The fourth detergent control valve 6534 is composed of a three-way valve installed at a connection portion between the second detergent circulation line 6522 and the drainage supply line 22 .

The fifth detergent control valve 6535 is composed of a two-way valve connected to the organic matter removal nutrient solution discharge line 42 corresponding to the front of the connection portion of the second detergent circulation line 6522 .

In addition, the cleaning circulation pipe portion 652 is connected to the first cleaning agent circulation line 6521 and the first branch line 6541 disposed toward the drainage storage tank 1 and the second branch disposed toward the discharge tank 655 . A drain line 654 consisting of a line 6543 is provided. In addition, a three-way valve 656 for controlling the flow direction of the drain containing the cleaning agent is installed in the branching portions of the first branch line 6541 and the second branch line 6542 , and the first cleaning agent circulation A sixth cleaning agent control valve 657 is installed at a position in contact with the branch point between the line 6521 and the drain line 654 , which controls the inflow of the drain containing the cleaning agent into the drain line 654 .

On the other hand, the purified nutrient solution storage tank 7 is a component arranged to store the purified nutrient solution discharged through the purified nutrient solution discharge line 66 after passing through the drainage sterilization module 6, and is composed of a container or a tank, and h) is connected to a culture medium supply line 72 (refer to FIG. 1) for supplying the purified nutrient solution.

The purified nutrient solution supply unit 8 is a component installed in the culture nutrient solution supply line for supplying the purified nutrient solution accommodated in the purified nutrient solution storage tank 7 to the cultivation area after being purified through each of the above-described purification processes. It is composed of a supply pump having a head suitable for the method and the amount of nutrient solution supplied.

In addition, a new nutrient solution supply unit 97 for additionally supplying a new nutrient solution as well as a recycled purified nutrient solution may be connected to the culture solution supply line 72 .

On the other hand, unexplained reference numeral 98 of FIG. 3A is a strainer installed on a pipe through which drainage flows and performing an auxiliary foreign matter removal action, and unexplained reference numeral 99 is a level gauge for measuring the flow rate.

Hereinafter, the operation of the circulating nutrient solution reuse system according to the first embodiment of the present invention will be described.

First, with reference to FIGS. 1 to 3B and 6A , a process in which the drainage solution discharged to the cultivation site (h) is purified through a circulating nutrient solution reuse system and reused in the cultivation field will be briefly described.

Drainage discharged after use in the cultivation area (h) flows into the drainage storage tank 1 through the recovery line h2 and is stored, and the stored drainage flows into the turbidity treatment tank 3 by the pumping action of the pressure pump 2 do.

Drainage flowing into the turbidity treatment tank 3 passes through the filtration layer 33 formed by filling sand, solids (SS), etc. are filtered, and then discharged through the filtered nutrient solution discharge line 32 to the organic matter treatment tank (4) is introduced into

Drainage flowing into the organic matter treatment tank 4 passes through the treatment layer 43 formed by activated carbon, and after organic matter is removed, it is discharged to the organic matter removal nutrient solution discharge line 42 and flows into the drainage sterilization module 6 .

After the sterilization process is performed while passing through the UV lamp sterilizer 61, the drainage liquid flowing into the drainage sterilization module 6 is stored in the purified nutrient solution storage tank 7 through the purified nutrient solution discharge line 66.

In this way, the purified nutrient solution accommodated in the purified nutrient solution storage tank 7 is supplied to the cultivation area h according to the operation of the purified nutrient solution supply unit 8 and reused for plant cultivation.

5 is a flowchart for explaining a backwashing method of a circulating nutrient solution reuse system according to a first embodiment of the present invention, and FIGS. 6a and 6b are a purification process and backwashing process of a circulating nutrient solution reuse system according to the present invention 6A shows the flow direction of the drainage when performing the drainage purification process, and FIG. 6B shows the flow direction of the drainage when the backwashing process is performed. And, in FIGS. 6A and 6B, the thick solid line or dashed line in the notation of each line indicates the flow path of the fluid (drainage), and the hatched part in the backwash control valve part 55 is for the operation of the opening and closing member. Accordingly, the flow path is blocked, and the unhatched part represents the open flow path.

5 to 6b, in the circulating nutrient solution reuse system according to the present invention, as described above, when the purification process of the drainage is performed for a certain period of time, the filtration layer 33 of the turbidity treatment tank 3 or the organic matter treatment tank Foreign substances are adsorbed to the treatment layer 43 of (4), and thus an appropriate purification process cannot be performed. For example, when the turbidity of the drained solution is high due to the accumulation of foreign substances in the filtration layer 33 of the turbidity treatment tank 3, even if the UVC light is irradiated from the drainage sterilization module 6, it is difficult to transmit and the sterilization action cannot be performed. A point is reached when microorganisms such as etc. cannot be eliminated

Accordingly, the circulating nutrient solution reuse system according to the present invention measures the turbidity of the turbidity treatment tank 3 or the organic matter treatment tank 4, and if the purification level does not reach the desired level, the turbidity treatment tank 3 or the organic matter treatment Backwashing is performed by supplying backwashing water to the lower part of the tank (4).

The backwashing process of the turbidity treatment tank 3 and the organic matter treatment tank 4 may be individually performed through the control of the backwash control valve unit 55, but hereinafter, the turbidity treatment tank 3 and the organic matter treatment tank It will be described based on an example in which the backwashing of (4) is performed simultaneously.

The backwashing method includes a first step (s1) of determining whether a backwash signal is input, and a second step (s2) of driving the pressure feeding pump 2 and the backwash control valve unit 55 to perform the backwashing process. ), a third step (s3) of calculating and calculating the linear velocity of the drainage moving inside the turbidity treatment tank 3 and the organic matter treatment tank 4, determining whether the calculated linear velocity is a preset linear velocity, and A fourth step (s4) of controlling the driving of the pressure-feeding pump (2) to a preset linear speed, and a fifth step (s5) of stopping the backwashing process when the driving time of the pressure-feeding pump (2) reaches a preset time (s5) ) is performed sequentially.

The first step (s1) is a determination step of determining whether to perform the backwashing process by determining whether a backwashing signal is input. Here, the backwash signal is the turbidity of the filtered water calculated according to an input signal input by the user for performing the backwash mode through the input unit 93 or a signal detected from a turbidity detecting means (not shown) such as a turbidity detecting sensor. It means an input signal that is automatically input under the control of the control unit when it is contaminated over a certain range.

In the second step (s2), when the backwash signal is input in the first step (s1), the pressure feeding pump 2 and the backwash control valve unit 55 are driven under the control of the controller 91 to perform the backwashing process. As shown in FIG. 6B under the control of the controller, the opening and closing operations of the first to fourth backwash control valve units 551,552,553,554 are performed to control the flow of backwash water in the direction indicated by the thick solid line, and the drainage is The first backwash water supply line 51, the first backwash water recovery line 52, the second backwash water supply line 53, and the second backwash water recovery line 54 supply backwash water while flowing in the direction indicated by the arrow. and a recovery process.

And, the drain flowing into the turbidity treatment tank 3 and the organic matter treatment tank 4 is sprayed at high pressure into the filtration layer 33 and the treatment layer 43 as backwashing water to wash sand and activated carbon pellets, and in the washing process The backflowing drainage is recovered to the drainage storage tank 1 via the first and second backwash water recovery lines 52 and 54, and the exfoliated foreign matter is provided in the turbidity treatment tank 3 and the organic matter treatment tank 4 It can be separated and removed if it is filtered by the foreign material filtering member, and if there is any floating matter, it is removed.

In the third step (s3), based on the signal applied from the flow meter 92 in the second step (s2), the drain flowing from the lower side to the upper side inside the turbidity treatment tank 3 and the organic matter treatment tank 4 during backwashing As a step of calculating and calculating the linear velocity of , the linear velocity can be obtained by dividing the flow rate obtained by the flow meter by the cross-sectional areas of the turbidity treatment tank 3 and the organic matter treatment tank 4 as is well known.

The fourth step (s4) is a step of determining whether the linear speed calculated in the third step (s3) is a preset linear speed, and if not, controlling the driving of the pressure feeding pump 2 so that it becomes a preset linear speed, That is, when the calculated linear speed is smaller than the preset linear speed, the control unit 91 controls the driving to increase the pumping flow rate of the pressure feeding pump 2, and when the linear speed is greater than the preset linear speed, the pumping flow rate is lowered. Controls the operation of the pump.

In this embodiment, the set linear velocity may be set to 2.0 m 3 /m 2 /hr or more. The critical value of this linear velocity was obtained through an experiment in which the solids (ss) of 50 mg/L or less was filtered and then backwashed as discharged from the rock wool medium.

As a result of performing the filtration process after performing the backwashing process for the time described below at a linear speed of 2.0㎥/m2/hr or more as described above, it was confirmed through an experiment that the removal rate of solids (SS) was significantly high. Therefore, if the linear velocity is 2.0㎥/m2/hr or higher, backwashing can be performed without any particular limitation on the numerical value. It is desirable to set the linear speed to be around 2.5m3/m2/hr in consideration of the increase in the load and waste of electrical energy.

The fifth step (s5) is a step (s51) of determining whether the driving time of the pressure feeding pump (2) is a preset time after making the linear speed calculated in the fourth step (s4) match the preset linear speed (s51); , after performing this determination step (s51), if the driving time of the pressure feeding pump is shorter than the set time, it continuously maintains the drive of the pressure feeding pump and stops the backwashing process when the set time is reached (s52).

Here, the set backwash time is set to 2 minutes or more. The critical value (2min) of this backwashing time is obtained through an experiment in which backwashing is performed after performing the purification process of the drainage (solids (ss) less than 50mg/L) used for the cultivation of plants planted in the rockwool medium. could

More specifically, as described above, an experiment was conducted to prove that the removal rate of solids (SS) was 95% or more as a result of performing the filtration process after performing the backwashing process for 2 minutes at a linear speed of 2.5㎥/m2/hr. could be verified through In addition, if the backwashing time is more than 2 minutes, it can be selected without any particular limitation, but the increase in the backwashing time is accompanied by an increase in the backwashing flow rate and causes an increase in the load of the filtration process or waste of electrical energy in the future. It is preferable to perform

On the other hand, when the backwashing process by draining is completed as described above, the pressure feeding pump 2 and the backwashing control valve 55 are operated under the control of the controller so that the flow of the drain is made as shown in FIG. 6A. The purification process can be performed automatically.

7 is a view for explaining an example in which the treatment by the organic matter treatment tank is omitted in the purification process of the circulating nutrient solution reuse system according to the present invention, and the thick solid line is the flow path of the fluid (drainage) , the hatched portion of the valve represents the state in which the flow path is blocked according to the operation of the opening/closing member, and the unhatched portion represents the open state of the flow path.

The circulating nutrient solution reuse system according to the present invention can selectively omit the organic matter removal process by the organic matter treatment tank 4 depending on the state of drainage.

For example, in the medium in which plants are grown, the rock wool medium has a low content of organic matter contained in the drainage, unlike the cocopit medium containing organic matter, so as shown in FIG. 7, the treatment selection control valve 442 is opened, When the first and second shut-off valves 443 and 444 are blocked, the drainage is bypassed through the selective piping line 441, so it flows into the drainage sterilization module 6 without going through the organic matter treatment tank 4, and the sterilization process is performed.

8 is a view for explaining the scale removal process of the drainage sterilization module in the purification process of the circulating nutrient solution reuse system according to the present invention, and the thick solid line in each line indicates the flow path of the drainage solution containing the cleaning agent. The hatched part of the valve represents the state in which the flow path is blocked according to the operation of the opening/closing member, and the unhatched part represents the open state of the flow path.

In the circulating nutrient solution reuse system according to the present invention, when scale is formed in the UV lamp sterilizer 61 and the UVC LED sterilizer 62 or the sterilization line 63 to which the drainage of the drainage sterilization module 6 is moved, it is difficult to transmit UVC light. Since the sterilization efficiency is reduced and the movement of the drainage is not smooth, if it is necessary to remove it, the cleaning operation by the scale removing unit 65 can be performed.

This cleaning operation operates the cleaning agent pump 6512 so that the cleaning agent in the cleaning agent container 6511 is supplied to the sterilization line 63 as shown in FIG. 8, while the first and second cleaning agent circulation lines 6521 and 6522 are operated. Accordingly, the first to fifth detergent control valves 6531, 6532, 6533, 6534, 6535 and the sixth detergent control valve 657 are opened and closed so that the drainage containing the detergent is circulated in the direction indicated by the thick solid line, and then the pressure pump ( When 2) is operated, the drainage solution containing the cleaning agent is circulated to remove the scale formed in the drainage sterilization module 6 and the like.

When the scale removal process is completed, the three-way valve 656 for drain direction control and the sixth detergent control valve 657 are opened and closed so as to be recovered through the drain line 654. When nitric acid is used as the cleaning agent, the discharge tank 655 ) so that the cleaning agent is moved to the second branch line 6542 by controlling the opening/closing direction of the three-way valve 656 for drain direction control so that it can be recovered and treated separately.

Although the configuration and operation of the circulating nutrient solution reuse system according to an embodiment of the present invention described above has been described, this is an example and those of ordinary skill in the art may not depart from the technical spirit of the present invention. It will be appreciated that substitutions and variations of some of the embodiments are possible.

Therefore, it should be understood that the scope of protection of the present invention extends to the invention described in the claims and their equivalents.

1: Drainage storage tank 2: Pressure pump
22: Drainage supply line 3: Turbidity treatment tank
32: filtrate nutrient solution discharge line 4: organic matter treatment tank
42: organic matter removal nutrient solution discharge line 5: backwashing device
51: first backwash water supply line 52: first backwash water recovery line
53: second backwash water supply line 54: second backwash water recovery line
55: backwash control valve part 6: drainage sterilization module
61: UV lamp sterilizer 62: UVC LED sterilizer
63: Sterilization line 7: Purification nutrient solution storage tank
8: purifying nutrient solution supply unit 91: control unit
92: flow meter 93: input unit

Claims (13)

In the circulation type nutrient solution reuse system,
Drainage storage tank in which the drainage discharged from the cultivation area is stored; a pressure pump for sucking the drainage stored in the drainage reservoir and pumping it through a drainage supply line; a turbidity treatment tank having a built-in treatment agent to perform a filtration process of the inflowing liquid by being pressurized by the pressure-feeding pump; a backwashing device connected to the drainage supply line and performing a backwashing process by pumping the drainage toward the turbidity treatment tank; a drainage sterilization module arranged to perform a sterilization process of the drainage discharged from the turbidity treatment tank; a purified nutrient solution storage tank disposed to store the purified nutrient solution discharged through the purified nutrient solution discharge line after passing through the drainage sterilization module; an organic matter treatment tank to which a filtrated nutrient solution discharge line through which the drainage through the turbidity treatment tank flows is connected, and an organic matter removal process is performed to discharge the organic matter through the organic matter removal nutrient solution discharge line; and a selective piping unit provided to supply the drainage that has passed through the turbidity treatment tank to the drainage sterilization module without going through the organic matter treatment tank so that the organic matter removal process can be selectively performed,
The backwash device may include: a first backwash water supply line connected to the drainage supply line to supply drainage to the turbidity treatment tank; a first backwash water recovery line connected between the drainage storage tank and the turbidity treatment tank and supplied to the turbidity treatment tank to recover the drainage solution used for backwashing; a second backwash water supply line connected to the first backwash water supply line to supply drainage to the organic matter treatment tank; a second backwash recovery line connected to the organic material treatment tank and the first reverse body spinal water recovery line and supplied to the organic material treatment tank to recover drainage used for backwashing; and backwashing control for supplying drainage to the first backwash water supply line and the second backwashing water supply line during backwashing of the turbidity treatment tank and the organic matter treatment tank, and performing an opening/closing operation so that the drain solution used for backwashing is recovered Circulating nutrient solution reuse system comprising a;
delete According to claim 1,
The selection pipe part,
a selective piping line connected between the filtered nutrient solution discharge line and the organic matter removal nutrient solution discharge line;
a treatment selection control valve installed in the selection piping line to control the flow of drainage;
a first shut-off valve installed in the filtered nutrient solution discharge line so that drainage flows to the selective piping line; and
and a second shut-off valve installed in the organic matter removal nutrient solution discharge line to prevent drainage from flowing into the organic matter treatment tank.
delete According to claim 1,
The first backwash water supply line is connected between the drainage supply line and the filtered nutrient solution discharge line, and the second backwash water supply line is connected between the first backwash water supply line and the organic matter removal nutrient solution discharge line. becomes,
The backwash control valve unit is installed in the drainage supply line to supply drainage to the first backwash water supply line during backwashing of the turbidity treatment tank and open and close so that the drainage used for backwashing is recovered to the drainage storage tank 1 backwash control valve unit;
A second backwash control valve installed in the nutrient solution discharge line and the first backwash water supply line to open and close so that the drain flowing into the first backwash water supply line is supplied to the turbidity treatment tank during backwashing of the turbidity treatment tank part;
a third backwash control valve unit that opens and closes so that the drain used for backwashing of the organic matter treatment tank is recovered to the drain storage tank via the second backwash recovery line; and
and a fourth backwash control valve that opens and closes so that the drain flowing into the second backwash water supply line is supplied to the organic matter treatment tank during backwashing of the organic matter treatment tank.
6. The method of claim 5,
The first backwash control valve unit is a three-way valve for controlling backwash water connected to the drainage supply line passing through a connection branch point with the first backwash water supply line and to which the first backwash water recovery line is connected,
The second backwash control valve unit includes a second backwash water control three-way valve connected to a connection portion of the filtrate nutrient solution discharge line and the first backwash water supply line,
The third backwash control valve unit is configured as a third backwash water control three-way valve connected to the filtrate nutrient solution discharge line in contact with the second backwash control valve unit to be connected to the second backwash water recovery line,
The fourth backwash control valve unit is installed in the organic matter removal nutrient solution discharge line in contact with the organic matter treatment tank and is configured as a fourth backwash water control three-way valve connected to the second backwash water supply line. system.
7. The method of claim 6,
a control unit for controlling driving of the pressure pump and the backwash control valve; and
Further comprising a flow meter installed in the drainage supply line,
The control unit includes a linear velocity calculation unit for calculating the linear velocity of the drainage solution moving in the turbidity treatment tank and the organic matter treatment tank during backwashing based on the signal applied from the flow meter, and is calculated from the linear velocity calculation unit A circulation type nutrient solution reuse system, characterized in that by comparing the set linear speed with a preset linear speed, the driving of the pressure pump is controlled so that the drain is moved at a preset linear speed.
8. The method of claim 7,
Further comprising an input unit for inputting a driving time of the pressure pump, a purification mode for performing a purification process of the drainage, and a backwashing mode for performing a backwashing process using the drainage,
The control unit is a circulation type nutrient solution reuse system, characterized in that for controlling the driving of the pressure-feeding pump and the backwash control valve unit according to the signal of the input unit.
According to claim 1,
The drainage sterilization module is a circulating nutrient solution reuse system, characterized in that at least one of a UV lamp sterilizer and a UVC LED sterilizer connected to the organic matter removal nutrient solution discharge line is installed.
10. The method of claim 9,
The UV lamp sterilizer is formed in a structure in which a UV lamp is provided in a sterilization tube through which drainage is moved,
A circulating nutrient solution reuse system, characterized in that a scale removal unit for removing scale formed in the UV lamp sterilizer is provided.
11. The method of claim 10,
The scale removing unit,
a detergent supply unit connected to the organic matter removal nutrient solution discharge line to supply the detergent to the sterilization pipe;
a first cleaning agent circulation line having one end connected to the purified nutrient solution discharge line and the other end connected to the drainage supply line in front of the pressure-feeding pump to circulate the drainage solution containing the cleaning agent;
a second cleaning agent circulation line having one end connected to the drainage supply line at the rear end of the pressure pump and the other end connected to the organic matter removal nutrient solution discharge line to circulate the drainage solution containing the cleaning agent; and
A circulation type nutrient solution reuse system, characterized in that it includes a detergent circulation control valve unit that opens and closes to form a flow path through which the drainage solution containing the detergent is circulated to the first detergent circulation line and the second detergent circulation line when the scale removal process is performed.
12. The method of claim 11,
The detergent circulation control valve unit,
a first detergent control valve installed at a connection portion between the purified nutrient solution discharge line and the first detergent circulation line so that the drainage solution containing the detergent passed through the drainage sterilization module flows to the first detergent circulation line;
a second detergent control valve installed in the drainage supply line corresponding to the front of the connection portion between the first detergent circulation line and the drainage supply line;
a third detergent control valve installed in the first detergent circulation line close to the connection portion of the first detergent circulation line and the drainage supply line;
a fourth detergent control valve installed at a connection portion between the second detergent circulation line and the drainage supply line; and
The circulation type nutrient solution reuse system, characterized in that it comprises a fifth detergent control valve connected to the organic matter removal nutrient solution discharge line corresponding to the front of the connection portion of the second detergent circulation line.
13. The method of claim 12,
a drain line connected to the first detergent circulation line and having a first branch line disposed toward the drainage reservoir and a second branch line disposed toward the discharge tank;
a three-way valve for drain direction control which is installed in the branch of the first branch line and the second branch line to control the flow direction of the drain containing the cleaning agent; and
A circulation type nutrient solution reuse system, characterized in that it comprises a sixth cleaning agent control valve for intermittent inflow of the drainage containing the cleaning agent into the drain line.

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