KR102545053B1 - Automatic Flushing Hybrid Bio-reactor System And Method for Controlling the Same - Google Patents

Abstract

The present invention can improve the efficiency of water treatment by integrating a fixed-bed biological filtration tank and a fluidized-bed biological filtration tank into one filtration tank, enable periodic automatic cleaning of the fixed-bed filter medium, and greatly reduce discharged water and energy consumption in the cleaning process. The hybrid biological filtration system according to the present invention relates to a fixed-phase filtration medium layer in which a plurality of fixed-phase filter media is arranged, and a fixed-phase filtration medium layer installed in communication with the upper portion of the fixed-phase filtration medium layer and floating in water. A fluidized bed filter medium layer in which a plurality of fluidized bed filter media is accommodated, and a plurality of through holes installed to cross the upper end of the fixed bed filter medium layer and the lower end of the fluidized bed filter medium layer and having a size through which the fluidized filter medium does not pass. A composite filtration tank including a porous barrier rib formed thereon; an inlet pipe for supplying water to be treated to the fixed bed filtration medium layer of the composite filtration tank; A treated water discharge pipe connected to the fluidized bed filtration medium layer of the composite filtration tank to discharge purified treated water; a first air injection pipe for injecting air to a lower portion of the fluidized bed filtration medium layer of the composite filtration tank; and a blower unit supplying air to the first air injection pipe.

Description

Automatic Flushing Hybrid Bio-reactor System And Method for Controlling the Same}

The present invention relates to a biological filtration system for water treatment of a circulating filtration aquaculture system, and more particularly, a fixed-bed biological filtration tank and a fluidized-bed biological filtration tank are integrated into one filtration tank, and the filtration tank is controlled through an automated washing program and an automatic control configuration. The present invention relates to a self-cleaning hybrid biological filtration system capable of self-cleaning by controlling air to be sprayed into a filtration tank in a state where input water to be treated is diverted to the outside.

The method of aquaculture is mainly carried out by flowing water, still water, circulation filtration, and cage culture, and the aquaculture system in Korea uses continuous replacement system (CRS) or continuous replacement system (CRS). Breeding water is required, and a large amount of breeding water used for breeding is discharged into the water system, becoming a major source of environmental pollution and ecosystem destruction, and energy consumption for heating new breeding water is also greatly increased.

Recently, as regulations on discharge water from farms have been strengthened, development of a system to reduce or purify discharge water generated within farms is becoming important. A lot of research is also going on.

The circulation filtration aquaculture system (RAS) not only increases productivity by enabling high-density aquaculture, but also reuses the breeding water required for aquaculture, enabling operation with only a small amount of water and reducing enormous power consumption for pumping water.

A typical circulation filtration system may consist of a breeding tank, a sedimentation tank, a biological filtration tank, a foam separation tank, and a purified water storage tank. The breeding water used and drained from the breeding tank flows into the sedimentation tank, goes through a series of purification processes through a drum filter, biological filtration tank and foam separation tank, and then is stored in the purified water storage tank and can be supplied back to the breeding tank.

Currently, eel is the most cultivated fish species in the circulatory filtration aquaculture system in Korea, and most of the breeding tank → drum filter (particulate solids removal device) → fixed bed filtration medium layer → fluidized bed filtration tank → heating tank → breeding tank are circulated in series You are building a type composition.

However, when the fixed bed filtration medium layer and the fluidized bed filtration tank are configured in series independently, the following problems may occur.

First, if there is no separate circulating filtration system for transporting fish, there is a problem in that it is impossible to manage the periodic washing cycle for the fixed-phase filtration medium.

Sticky solids adhering to the stationary phase filter medium can act as a habitat for parasites, and the accumulation of excessive solids can make the search cloudy and make it difficult to observe fish.

In addition, in the process of decomposition of the sticky solids attached to the fixed bed filtration medium, the load of contamination in the system may increase, and the nitrogen load of the fluidized bed filtration medium may increase, and due to the large amount of organic matter, heterotrophic bacteria and nitrifying bacteria using organic matter may increase. competition occurs, and there are problems such as an increase in ammonia nitrogen and nitrite nitrogen, which are highly toxic to fish.

Therefore, if the fixed bed filtration medium layer is not cleaned for a long period of time, the productivity of farmed fish may decrease due to water quality deterioration.

Second, energy and water loss may occur due to excessive discharge water.

Currently, domestic farms are concentrated in a specific area. For example, in the case of eels, eel production is concentrated in Jeonnam and Jeonbuk areas, and about 2-3 times the amount of domestic average groundwater development is used, and groundwater is used every year. The amount of well development is on the rise.

In the case of such an eel farming site, continuous washing of the stationary phase filtration medium layer is not performed, and the contamination load of solids discharged during one washing is high. In addition, since all the water in the filtration tank is discharged during the washing of the fixed bed filtration medium layer, a lot of new water is required, which accelerates the depletion of groundwater resources and increases the energy cost required for heating the new water.

Third, in the circulating filtration aquaculture system including the fixed bed filtration medium layer, workers directly enter and wash the filtration tank to wash the fixed bed filtration medium to which solids are attached during the washing process.

When workers enter the filter tank to clean the fixed bed filter medium layer, the safety risk due to toxic gas generated by the decay of a large amount of attached organic matter increases. However, this may increase the possibility of harmful water quality conditions to breeding organisms, thereby impairing productivity.

Republic of Korea Patent Registration No. 10-2242705 (registered on April 15, 2021) Republic of Korea Patent Registration No. 10-2028149 (registered on September 26, 2019) Korean Registered Patent No. 10-0564080 (registered on March 20, 2006)

The present invention is to solve the above problems, and an object of the present invention is to provide a hybrid biological filtration system capable of improving water treatment efficiency by integrating a fixed-bed biological filtration tank and a fluidized-bed biological filtration tank into one filtration tank.

Another object of the present invention is to provide a hybrid biological filtration system capable of periodically and automatically cleaning a fixed bed filter medium and significantly reducing discharged water and energy consumption during the cleaning process.

A hybrid biological filtration system according to the present invention for achieving the above object is a fixed bed filtration medium layer in which a plurality of fixed bed filter media are arranged, and a plurality of flows installed in communication with the upper portion of the fixed bed filtration medium layer and floating in water. A fluidized bed filter medium layer in which the filter medium is accommodated, and a plurality of through holes installed to cross the upper end of the fixed bed filter medium layer and the lower end of the fluidized bed filter medium layer and having a size that does not allow the fluidized filter medium to pass through, Composite filtration tank including a porous partition wall; an inlet pipe for supplying water to be treated to the fixed bed filtration medium layer of the composite filtration tank; A treated water discharge pipe connected to the fluidized bed filtration medium layer of the composite filtration tank to discharge purified treated water; a first air injection pipe for injecting air to a lower portion of the fluidized bed filtration medium layer of the composite filtration tank; and a blower unit supplying air to the first air injection pipe.

A hybrid biological filtration system according to another aspect of the present invention includes a bypass pipe having one end connected to the water-to-be-treated inlet pipe to bypass the water-to-be-treated to the outside of the complex filtration tank and transfer it to the outside; a first bypass flow control valve installed at a connection between the inlet pipe and the bypass pipe to control the supply of the water to be treated to one of the fixed bed filtration medium layer and the bypass pipe; a bypass pump transporting water to be treated through the bypass pipe; a storage tank installed independently outside the composite filtration tank to receive and store the treated water of the fluidized bed filtration medium layer; a treatment water transfer pipe supplying treatment water of the fluidized bed filtration medium layer to a storage tank; a first storage water control valve for controlling the supply of treatment water from the fluidized bed filtration medium layer to the storage tank by opening and closing the duct of the treatment water transfer pipe; a treatment water recovery pipe for resupplying the treatment water in the storage tank into the composite filtration tank after the cleaning of the fixed bed filtration medium layer is completed; a treatment water recovery pump pumping treatment water from the storage tank to the composite filtration tank through the treatment water recovery pipe; The water to be treated is transferred to the outside through the bypass pipe, and in a state where the water to be treated in the fluidized bed filtration medium layer is transported to the storage tank and stored therein, air is blown into the fixed bed filtration medium layer to form a fixed bed filtration medium layer. washing unit to wash; And, the first bypass flow control valve, the bypass pump, the first storage water control valve, and the water to be treated in each of the water treatment mode of the water to be treated through the composite filtration tank and the washing mode of the fixed bed filtration medium layer by the washing unit. A recovery pump and a control unit for controlling the operation of the cleaning unit may be further included.

One end of the bypass pipe is connected to the treated water discharge pipe, bypasses and transfers the water to be treated to the outside of the complex filtration tank through the treated water discharge pipe, and controls the flow path at the connection between the bypass pipe and the treated water discharge pipe. 2A bypass flow control valve can be installed.

A hybrid biological filtration system according to another aspect of the present invention includes a filter tank level sensor for detecting the water level of the fluidized bed filter medium layer and transmitting a detection signal to the control unit, and detecting the water level of the storage tank to control the water level. A storage tank level sensor for transmitting a detection signal to the unit may be further included.

In addition, the hybrid biological filtration system includes a new water supply pipe for supplying new water into the composite filtration tank after washing the fixed bed filtration medium layer; And, while being operated by the control unit may further include a new water control valve for controlling the supply of new water through the new water supply pipe.

The cleaning unit is installed in the lower portion of the fixed bed filtration medium layer, and is connected to an air supply pipe connecting the blower unit and the first air injection pipe through an air supply control valve, so that the air supplied from the blower unit is supplied to the fixed bed filtration medium layer. A second air injection pipe for cleaning by spraying into the inside; a contaminated water discharge pipe for discharging water and solids from the fixed-phase filtration medium layer to the outside after washing of the fixed-phase filtration medium layer; and a polluted water discharge control valve controlling discharge of water through the polluted water discharge pipe.

Preferably, the second air injection tube is disposed directly below the fixed bed filter medium of the fixed bed filter medium layer, and a spray hole for spraying air is arranged at the bottom to spray air toward the bottom surface of the fixed bed filter medium layer.

The hybrid biological filtration system according to another aspect of the present invention may further include a treatment water discharge pipe for discharging the treatment water in the storage tank to the outside through the contaminated water discharge pipe.

In addition, the cleaning unit is installed to contact lower ends of the plurality of fixed-bed filter media, and further includes an ultrasonic vibration rod for ultrasonically vibrating the fixed-bed filter media by ultrasonically vibrating by the control unit when air is injected through the second air injection pipe. can do.

The control method of the hybrid biological filtration system according to the present invention having the above configuration,

(S1) supplying the water to be treated to the fixed bed filtration medium layer at the bottom of the complex filtration tank through the water to be treated inlet pipe;

(S2) spraying air into the fluidized bed filtration medium layer above the composite filtration tank to suspend the fluidized bed filter medium and perform water treatment; and,

(S3) discharging the treated water purified in the fluidized bed filtration medium layer at the upper part of the composite filtration tank to the outside through the treated water discharge pipe;

can include

After the step (S3),

(S4-1) Blocking the passage connecting the water inlet pipe to be treated and the complex filtration tank, and transferring the water to be treated by bypassing the water supplied through the inlet pipe to the outside through the bypass pipe ;

(S4-2) discharging the treatment water in the fluidized bed filtration medium layer to the outside and storing it in a storage tank;

(S4-3) washing the fixed bed filtration medium layer by blowing air into the fixed bed filtration medium layer;

(S4-4) discharging contaminated water and solids in the fixed-phase filtration medium layer to the outside after the cleaning of the fixed-phase filtration medium layer is complete;

(S4-5) supplying the treated water stored in the storage tank into the composite filtration tank; and,

(S4-5) replenishing new water in the storage tank;

After executing the washing mode including, the water treatment mode including the above (S1) to (S3) may proceed again.

The step (S4-2) may be stopped when the level of the water to be treated in the fluidized bed filtration medium layer reaches a predetermined level detected by the filtration tank level sensor.

The step (S4-5) may be stopped when the water level in the storage tank reaches a predetermined level detected by the storage tank level sensor.

In the step (S4-3), when air is blown into the fixed bed filter medium layer, the fixed bed filter material may be ultrasonically vibrated to remove solids attached to the fixed bed filter material and may be cleaned.

According to the present invention, there are the following effects.

First, since the composite filtration tank is composed of a fixed bed filtration medium layer and a fluidized bed filtration medium layer integrated up and down in one filtration tank, the overall configuration can be simplified, the overall installation area can be reduced, and the water treatment efficiency can be improved. .

Second, there is an advantage in that periodic cleaning is possible because the water to be treated can be bypassed through the bypass pipe during cleaning.

That is, when washing the fixed-phase filtration medium layer of the complex filtration tank, the water path can be bypassed through the bypass pipe and transferred to the next water treatment equipment, and the operator can cycle as needed regardless of whether fish are stocked in the circulating filtration aquaculture system. Gentle cleaning is possible.

Third, in the washing process, the water to be treated in the fluidized bed filtration medium layer of the composite filtration tank is transferred to and stored in the storage tank, and after washing is completed, the water to be treated in the storage tank is returned to the composite filtration tank and used for water treatment. Therefore, it is possible to protect energy costs required for controlling the water temperature of breeding water and water resources used for new water, and additionally, there is an advantage of miniaturizing the size of the facility required for waste water treatment.

Fourth, during washing, in the state where the treatment water of the fluidized bed filter medium layer is transferred to the storage tank, air is sprayed through the second air injection pipe installed in the fixed bed filter medium layer to desorb and remove solids attached to the fixed bed filter medium by aeration. Therefore, it is not necessary for a person to directly enter the filtration tank to perform the solids removal operation, and thus the safety of the washing operation can be secured and the efficiency of the washing operation can be improved.

fifth. By automating water treatment and washing operations through the control unit, it is possible to minimize operational problems that may occur in the circulating filtration aquaculture system by preventing malfunction of valves and pumps by operator or worker's mistake.

1 is a perspective view showing a self-cleaning hybrid biological filtration system according to an embodiment of the present invention.
2 is a cross-sectional view of a self-cleaning hybrid biological filtration system according to one embodiment of the present invention.
3 is a cross-sectional view showing a portion of a self-cleaning hybrid biological filtration system according to an embodiment of the present invention.
4 is a configuration diagram showing a configuration for controlling a self-cleaning hybrid biological filtration system according to an embodiment of the present invention.
5 is a cross-sectional view of a portion of a self-cleaning hybrid biological filtration system according to another embodiment of the present invention.

A self-cleaning hybrid biological filtration system and a control method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Since the present invention can have various changes and various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals have been used for like elements throughout the description of each figure. In the accompanying drawings, the dimensions of the structures are shown enlarged than actual for clarity of the present invention, or reduced than actual in order to understand the schematic configuration.

Also, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

1 to 4, the self-cleaning hybrid biological filtration system according to an embodiment of the present invention is a biological filter tank for biological purification of breeding water to be purified (hereinafter referred to as 'water to be treated'). The composite filtration tank 100, the storage tank 300 for receiving and storing purified water (hereinafter referred to as 'treated water') of the upper layer of the composite filtration tank 100 in the cleaning process of the composite filtration tank 100, and the composite filtration tank 100 In the washing process of ), the bypass pipe 230 bypasses and transfers the water to be treated to the outside of the composite filtration tank 100, and the air flows from the bottom to the top of the fluidized bed filtration medium layer 120 of the composite filtration tank 100. A first air injection pipe 420 for injecting, a second air injection pipe 430 for injecting air for cleaning to the lower part of the fixed phase filtration medium layer 110 at the bottom of the composite filtration tank 100, the first air powder The blower unit 400 for supplying air to the tube 420 and the second air injection tube 430, and the fixed bed filter medium layer 110 of the composite filtration tank 100 spray air to clean the fixed bed filter medium layer It includes a washing unit that

The composite filtration tank 100 has a fixed bed filter medium layer 110 in which a plurality of fixed bed filter media 111 are arranged, and a plurality of fluidized bed filter media installed in communication with the upper portion of the fixed bed filter medium layer 110 and floating in water ( 121) is accommodated in the fluidized bed filtration medium layer 120 and the porous barrier 130 is installed between the fixed bed filtration medium layer 110 and the fluidized bed filtration medium layer 120.

To the lower end of one side of the fixed bed filtration medium layer 110 of the composite filtration tank 100, a water inlet pipe 210 for supplying the water to be treated discharged from the breeding tank is connected, and the upper side of the other side is connected to the fluidized bed filtration medium layer ( 120) is connected to a treated water discharge pipe 220 for discharging the purified treated water to the outside.

In the fixed bed filter medium layer 110, a plurality of fixed bed filter media 111 are arranged in a lattice structure. The fixed bed filter medium 111 is a filter medium designed to provide a place for bacteria to settle and form stable colonies, and is constructed by applying a known fixed bed filter medium used as a biological filter medium of a general circulation filtration aquaculture system (RAS). can do. The fixed bed filter material 111 is precipitated in the filter tank, and while organic wastewater, the water to be treated, passes through the fixed bed filter material 111, organic matter is adsorbed on the surface of the fixed bed filter material 111, forming a bio film in which microorganisms that feed on it live. To form, by contacting the water to be treated with such a microbial film, contaminants in the water to be treated are removed.

The fixed bed filter medium 111 is installed so that the lower end is spaced apart from the bottom surface by a predetermined distance and the upper end is in contact with the porous partition wall 130, so that solids are attached to the surface of the fixed bed filter medium 111 as water passes in an upward flow, Thereafter, the water to be treated passes through the upper porous barrier rib 130 and the fluidized bed filtration medium layer 120 so that the purified water can flow out.

The flow rate of the water to be treated flowing into the fixed bed filtration medium layer 110 through the water to be treated inlet pipe 210 is designed to form a laminar flow and a flow rate at which solids can settle by utilizing Stokes' law.

The fluidized bed filtration medium layer 120 is formed to be stacked on top of the fixed bed filtration medium layer 110, and a plurality of fluidized bed filter media 121 purifying while floating in water are provided inside. The fluidized bed filter medium 121 is always fluidized in the water in the fluidized bed filter medium layer 120 by the air injected from the first air injection pipe 420, and oxygen supply must be made smoothly, and in this process, microorganisms are formed. It purifies the water and grows.

The fluidized bed filtration medium layer 120 serves to oxidize ammonia and nitrite nitrogen in the water from which solids have been removed by passing through the fixed bed filtration medium layer 110 . The filling rate of the fluidized bed filter medium 121 in the fluidized bed filter medium layer 120 varies from about 10 to 60%, but is typically 10 to 25% of the volume of the fluidized bed filter medium layer 120 in the case of aquaculture sites. can be used. For proper flow of the fluidized bed filter medium 121, it is preferable to supply an aeration flow rate corresponding to 10 times the floor area per hour.

The porous barrier 130 is made of a rectangular porous plate made of a material that is not corroded by water and is installed to cross the upper end of the fixed bed filtration medium layer 110 and the lower end of the fluidized bed filtration medium layer, thereby forming a fixed bed filtration medium layer 110. and the fluidized bed filtration medium layer 120 are partitioned. The porous partition wall 130 allows the upward flow in the fixed bed filtration medium layer 110 to smoothly pass through the fluidized bed filtration medium layer 120, but does not discharge the treatment water in the fluidized bed filtration medium layer 120 during the washing process. It has a plurality of through holes having a size through which the fluidized bed filter medium 121 does not pass. The porous barrier 130 may have a mesh structure.

The storage tank 300 discharges the water to be treated in the fluidized bed filtration medium layer 120 during the cleaning process of the fixed bed filtration medium layer 110, temporarily stores it, and returns it to the fluidized bed filtration medium layer 120 after washing is completed. It is intended to supply, is installed outside the composite filtration tank 100, and is designed to have a volume capable of accommodating all the treatment water present in the fluidized bed filtration medium layer 120.

A treatment water transfer pipe 310 is installed between the lower end of the fluidized bed filtration medium layer 120 and the upper end of the storage tank 300 to supply the treated water of the fluidized bed filtration medium layer 120 to the storage tank 300. A separate pump is not installed in the treatment water transport pipe 310, and the treatment water of the fluidized bed filtration medium layer 120 can be transferred to the storage tank 300 through the treatment water transport pipe 310 by natural water pressure. A treatment water transport control valve 320 is installed in the treatment water transport pipe 310 to control the supply of treatment water from the fluidized bed filtration medium layer 120 to the storage tank 300 by opening and closing the pipeline.

In addition, between the lower end of the storage tank 300 and the lower end of the fluidized bed filtration medium layer 120, after the cleaning of the fixed bed filtration medium layer 110 is completed, the treatment water in the storage tank 300 is returned to the fluidized bed of the composite filtration tank 100. Pumping the treatment water from the storage tank 300 to the fluidized bed filtration medium layer 120 through the treatment water recovery pipe 330 that is re-supplied into the filtration medium layer 120 and the treatment water recovery pipe 330 A treatment water recovery pump 340 is installed.

In addition, the water to be treated supplied to the complex filtration tank 100 for cleaning the fixed bed filtration medium layer 110 is bypassed to the outside without being supplied to the complex filtration tank 100 and transferred to another biological filtration tank or other treatment device. A pipe 230 is connected to the inlet pipe 210 and the discharge pipe 220 of the treated water, and the bypass pipe 230 has a bypass pump for transferring the water to be treated through the bypass pipe 230 ( 240) is installed.

First bypass control for controlling the supply of the water to be treated to either the fixed bed filtration medium layer 110 or the bypass pipe 230 to the connection portion between the bypass pipe 230 and the inlet pipe 210 for the treated water. A valve 250 is installed. In addition, a second bypass flow control valve 260 for controlling the flow path is installed at a connection between the other end of the bypass pipe 230 and the treated water discharge pipe 220. The first bypass control valve 250 and the second bypass control valve 260 can be configured by applying an electric 3-way valve that automatically opens and closes in response to an electric signal applied from the control unit 600.

A second air injection pipe 430 connected to the blower unit 400 and spraying air for cleaning into the fixed bed filtration medium layer 110 is installed on the bottom surface of the composite filtration tank 100 . The second air injection pipe 430 is connected to the first air injection pipe 420 through the air flow control valve 440 to the air supply pipe 410 connected to the blower unit 400 . Therefore, while the air supplied from the blower unit 400 is supplied to one of the first air injection pipe 420 and the second air injection pipe 430 by controlling the flow path of the air flow control valve 440, the fluidized filter medium ( 121) to perform water treatment by flotation or cleaning of the fixed bed filtration medium layer 110. The air flow control valve 440 may also be configured by applying an electric 3-way valve that automatically opens and closes in response to an electric signal applied from the control unit 600 .

The second air injection pipe 430 is disposed directly below the plurality of fixed-phase filter media 111 arranged in the fixed-phase filter medium layer 110, and a spray hole 431 for injecting air is arranged at the bottom to filter the fixed bed. By spraying air toward the bottom surface of the medium layer 110, the water spray area that may occur around the second air injection pipe 430 can be minimized and solids attached to the stationary filter medium 111 can be effectively detached and removed. It is preferable to The air injected downward from the second air injection pipe 430 hits the bottom surface of the fixed bed filter medium layer 110 and then flows upward to desorb and remove solids attached to the fixed bed filter medium 111 .

The blower unit 400 may be configured by applying an air compressor capable of supplying air at a predetermined pressure, or a blowing fan and fan motor.

On the bottom surface of the composite filtration tank 100, a contaminated water discharge pipe 140 for discharging water and solids from the fixed-phase filtration medium layer 110 to the outside after washing the fixed-phase filtration medium layer 110 is completed, and the contaminated water discharge pipe 140 ) is installed to open and close the contaminated water discharge control valve 150 to control the discharge of water and solids. In addition, the contaminated water discharge control valve 150 is also connected to the treatment water discharge pipe 350 connected to the lower end of the storage tank 300, and if necessary, the treatment water stored in the storage tank 300 is passed through the contaminated water discharge pipe 140. It can also be discharged outside.

On one side of the upper part of the composite filtration tank 100, a new water supply pipe 510 for supplying new water (new water) into the composite filter tank 100 after the fixed bed filter medium layer 110 is cleaned, and the new water supply pipe 510 A new water control valve 520 is installed to control the supply of new water through the new water supply pipe 510 by opening and closing the conduit.

The hybrid biological filtration system having such a configuration includes a water treatment mode in which water to be treated is supplied into the complex filtration tank 100 to perform biological purification, and a bypass pipe 230 without supplying water to be treated into the complex filtration tank 100. A washing mode in which the stationary phase filtration medium layer 110 under the composite filtration tank 100 is washed while being transferred to the outside by bypassing the filter may be automatically performed through the control unit 600.

The control unit 600 operates the bypass pump 240 and the first bypass control valve 250 in the water treatment mode of the water to be treated through the complex filtration tank 100 and the washing mode of the fixed bed filtration medium layer 110. ), second bypass flow control valve 260, treatment water transport control valve 320, treatment water recovery pump 340, contaminated water discharge control valve 150, air flow control valve 440, new water control valve 520, etc. are configured to be automatically controlled according to an automation program.

A filtration tank water level sensor 160 for detecting the water level and transmitting a detection signal to the control unit 600 is installed in the fluidized bed filtration medium layer 120 of the composite filtration tank 100, and the storage tank 300 also monitors the water level. A storage tank level sensor 360 for detecting and transmitting a detection signal to the control unit 600 may be installed.

A hybrid biological filtration system having the configuration described above may operate as follows.

First, the water treatment mode will be described.

The water treatment mode maintains the water quality at a level that can ensure the productivity of fish in the circulation filtration aquaculture system, removes solids present in the water to be treated flowing into the complex filtration tank 100, and dissolves dissolved ammonia and nitrite nitrogen. It is a mode of purifying water to be treated for the purpose of oxidizing it and converting it into a form of nitrate nitrogen that is relatively less toxic.

In the water treatment mode, the control unit 600 blocks the flow path in which the first bypass flow control valve 250 and the second bypass flow control valve 260 are connected to the bypass pipe 230, and the treated water inlet pipe 210 The water to be treated supplied through is supplied to the lower end of the fixed bed filtration medium layer 110 of the composite filtration tank 100. In addition, the air flow control valve 440 controls the flow path so that the air supplied from the blower unit 400 is supplied to the first air injection pipe 420, and the air is injected through the first air injection pipe 420 to flow. The fluidized bed filter medium 121 in the bed filter medium layer 120 is continuously suspended.

The water to be treated supplied to the fixed bed filtration medium layer 110 of the composite filtration tank 100 flows while rising after the solids are removed by the fixed bed filter medium 111 of the fixed bed filtration medium layer 110, forming a porous partition wall 130. will pass through

Water to be treated that has passed through the porous partition wall 130 is purified by the fluidized bed filter medium 121 in the fluidized bed filtration medium layer 120 and then discharged to the outside through the treated water discharge pipe 220 .

This water treatment mode proceeds until the operator executes a separate washing mode or automatically executes the washing mode in the automation program built in the control unit 600 .

In the washing mode, the water to be treated is diverted through the bypass pipe 230 without supplying it into the complex filtration tank 100, so that fish farming in the circulating filtration aquaculture system is possible even during the washing process, and fixed-phase filtration without the operator entering the filtration tank directly. This is a mode in which air is blown into the fixed bed filtration medium layer 110 to perform washing so that solids can be removed and washed from the medium layer 110 .

In the washing mode, the control unit 600 controls the first bypass flow control valve 250 and the second bypass flow control valve 260 to open the flow path connected to the bypass pipe 230 to open the water inlet pipe 210 to be treated. The water to be treated supplied through) is diverted through the bypass pipe 230 without being supplied to the composite filtration tank 100.

Then, the control unit 600 opens the treatment water transport control valve 320 so that the treatment water of the fluidized bed filtration medium layer 120 is transferred to the storage tank 300 through the treatment water transport pipe 310 by water pressure. do. When all the treated water in the fluidized bed filtration medium layer 120 is transferred to the storage tank 300 and the water level goes below the filter tank level sensor 160, the filter tank level sensor 160 detects this and returns to the control unit 600. After transmitting the detection signal, the control unit 600 shuts off the water treatment control valve 320 .

Subsequently, the control unit 600 switches the path of the air flow control valve 440 from the first air injection pipe 420 to the second air injection pipe 430 to convert the air supplied from the blower unit 400 into the second air. It is injected to the lower portion of the fixed bed filter medium layer 110 through the spray pipe 430 to desorb and remove solids from the fixed bed filter medium 111 by aeration.

When a certain time elapses or the operator determines that washing is complete and inputs a washing completion command to the control unit 600, the contaminated water discharge control valve 150 is opened to discharge water and solids in the fixed bed filtration medium layer 110. The contaminated water is discharged to the outside through the discharge pipe 140. The discharge of these solids is maintained for as long as the safety factor 1.2 is applied to the discharge time calculated using the Bernoulli equation and the head loss occurring in the pipe after the cleaning by air injection through the second air injection pipe 430 is finished. It can be. When the discharge of contaminated water and solids is completed, the contaminated water discharge control valve 150 is closed.

When the washing is completed as described above, in order to restart the water treatment mode, water into the composite filtration tank 100 is re-supplied, and new water is re-supplied as much as the water in the fixed bed filtration medium layer 110 has been removed, thereby circulating filtration. Nitrate nitrogen that can accumulate in the aquaculture system is removed, and the water resupply mode is in progress to prevent useful microorganisms and energy cost loss that may occur during the washing process by resupplying the previously used aquaculture water and proper water return. .

In the water resupply mode, the control unit 600 operates the treatment water recovery pump 340 to supply the treatment water in the storage tank 300 into the composite filtration tank 100 through the treatment water recovery pipe 330. In addition, since new water must be re-supplied as much as the water in the fixed bed filtration medium layer 110 is removed, the new water control valve 520 is opened to supply new water into the composite filter tank 100 through the new water supply pipe 510. .

The supply of new water is maintained from the end of the solids discharge process in the washing process until the set water level is detected by the filtration tank water level sensor 160. In addition, the resupply of the treated water from the storage tank 300 to the composite filtration tank 100 is maintained from the end of the solids discharge process in the washing process until the low water level is detected by the storage tank water level sensor 360, and then processed. The operation of the water recovery pump 340 is stopped.

Then, the operation of the bypass pump 240 is stopped, and the flow paths of the first bypass flow control valve 250 and the second bypass flow control valve 260 are switched to close the bypass pipe 230 .

When the re-supply of water is completed, the above-described water treatment mode is resumed to purify the water to be treated.

On the other hand, when the solids attached to the fixed bed filter medium 111 are desorbed and removed by spraying air through the second air injection pipe 430 in the cleaning mode of the above-described fixed bed filter medium layer 110, the separation of the solids is further increased. In order to smoothly improve the cleaning performance, as shown in FIG. 5, an ultrasonic vibration rod 700 is installed to contact the lower end of the plurality of fixed bed filter media 111, and the ultrasonic vibration rod 700 is connected to the control unit 600 ) (see FIG. (4)), when air is injected through the second air injection pipe 430, power is applied to the ultrasonic vibration rod 700 by the control unit 600 to vibrate the stationary phase by ultrasonic vibration. The filter medium 111 may be ultrasonically vibrated.

In this way, by simultaneously generating aeration and ultrasonic vibration in the fixed bed filter medium layer 110, the solids attached to the fixed bed filter medium 111 can be more effectively desorbed and removed.

Although the detailed description of the present invention described above has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary knowledge in the art will find the spirit of the present invention described in the claims to be described later. And it will be understood that the present invention can be variously modified and changed without departing from the technical scope.

100: composite filtration tank 110: fixed phase filtration medium layer
111: fixed bed filter medium 120: fluid bed filter medium layer
121: fluidized bed filter medium 130: porous partition wall
140: polluted water discharge pipe 150: polluted water discharge control valve
160: filter tank water level sensor 210: water to be treated inlet pipe
220: treated water discharge pipe 230: bypass pipe
240: bypass pump 250: first bypass flow control valve
260: second bypass flow control valve 300: storage tank
310: treatment water transport pipe 320: treatment water transport control valve
330: treatment water recovery pipe 340: treatment water recovery pump
350: treatment water discharge pipe 360: storage tank water level sensor
400: blower unit 410: air supply pipe
420: first air injection pipe 430: second air injection pipe
431: injection hole 440: air flow control valve
510: new water supply pipe 520: new water control valve

Claims (14)

A fixed bed filtration medium layer in which a plurality of fixed bed filter media is arranged, a fluidized bed filtration medium layer installed in communication with the upper portion of the fixed bed filtration medium layer and containing a plurality of fluidized bed filter media floating in water, and the fixed bed filtration medium A composite filter tank including a porous barrier rib installed to cross the upper end of the layer and the lower end of the fluidized bed filter medium layer and having a plurality of through-holes having a size through which the fluidized bed filter medium does not pass;
an inlet pipe for supplying water to be treated to the fixed bed filtration medium layer of the composite filtration tank;
A treated water discharge pipe connected to the fluidized bed filtration medium layer of the composite filtration tank to discharge purified treated water;
a first air injection pipe for injecting air to a lower portion of the fluidized bed filtration medium layer of the composite filtration tank;
a blower unit supplying air to the first air injection pipe;
a bypass pipe having one end connected to the inlet pipe for bypassing and transporting the water to be treated to the outside of the complex filtration tank;
a first bypass flow control valve installed at a connection between the inlet pipe and the bypass pipe to control the supply of the water to be treated to one of the fixed bed filtration medium layer and the bypass pipe;
a bypass pump transporting water to be treated through the bypass pipe;
a storage tank installed independently outside the composite filtration tank to receive and store the treated water of the fluidized bed filtration medium layer;
a treatment water transfer pipe supplying treatment water of the fluidized bed filtration medium layer to a storage tank;
a first storage water control valve for controlling the supply of treatment water from the fluidized bed filtration medium layer to the storage tank by opening and closing the duct of the treatment water transfer pipe;
a treatment water recovery pipe for resupplying the treatment water in the storage tank into the composite filtration tank after the cleaning of the fixed bed filtration medium layer is completed;
a treatment water recovery pump pumping treatment water from the storage tank to the composite filtration tank through the treatment water recovery pipe;
The water to be treated is transferred to the outside through the bypass pipe, and in a state where the water to be treated in the fluidized bed filtration medium layer is transported to the storage tank and stored therein, air is blown into the fixed bed filtration medium layer to form a fixed bed filtration medium layer. washing unit to wash; and,
The first bypass flow control valve, the bypass pump, the first storage water control valve, and the treatment water recovery pump in each of the water treatment mode of the water to be treated through the complex filtration tank and the washing mode of the fixed bed filtration medium layer by the washing unit. , and a control unit for controlling the operation of the cleaning unit;
including,
The washing unit,
It is installed in the lower part of the fixed bed filtration medium layer, and is connected to the air supply pipe connecting the blower unit and the first air injection pipe through an air supply control valve to inject the air supplied from the blower unit into the fixed bed filtration medium layer for cleaning. A second air injection pipe to perform;
a contaminated water discharge pipe for discharging water and solids from the fixed-phase filtration medium layer to the outside after washing of the fixed-phase filtration medium layer; and,
a polluted water discharge control valve controlling discharge of water through the polluted water discharge pipe;
Including,
The fixed-phase filter medium has a lower end spaced apart from the bottom surface of the fixed-phase filter medium layer by a predetermined distance and an upper end part that is in contact with the porous partition wall,
The second air injection pipe is disposed directly below the fixed bed filter medium of the fixed bed filter medium layer, and a spray hole for spraying air is arranged at the bottom to spray air toward the bottom surface of the fixed bed filter medium layer. Hybrid biological filtration system. delete The method of claim 1, wherein one end of the bypass pipe is connected to the treated water discharge pipe to bypass and transport the water to be treated to the outside of the composite filtration tank through the treated water discharge pipe,
A hybrid biological filtration system in which a second bypass flow control valve for controlling the flow path is installed at a connection between the bypass pipe and the treated water discharge pipe. The method of claim 1, wherein a filtration tank water level sensor detects the water level of the fluidized bed filtration medium layer and transmits a detection signal to the control unit, and a storage tank detects the water level of the storage tank and transmits a detection signal to the control unit. A hybrid biological filtration system further comprising a water level sensor. delete delete delete The hybrid biological filtration system according to claim 1, further comprising a treatment water discharge pipe for discharging the treatment water in the storage tank to the outside through the contaminated water discharge pipe. According to claim 1, wherein the cleaning unit is installed to contact lower ends of the plurality of fixed bed filter media, and when air is sprayed through the second air injection pipe, the control unit ultrasonically vibrates the fixed bed filter media so as to ultrasonically vibrate the fixed bed filter media. A hybrid biological filtration system further comprising a vibrating rod. A control method of the hybrid biological filtration system according to claim 1,
(S1) supplying the water to be treated to the fixed bed filtration medium layer at the bottom of the complex filtration tank through the water to be treated inlet pipe;
(S2) spraying air into the fluidized bed filtration medium layer above the composite filtration tank to suspend the fluidized bed filter medium and perform water treatment; and,
(S3) discharging the treated water purified in the fluidized bed filtration medium layer at the upper part of the composite filtration tank to the outside through the treated water discharge pipe;
Including,
After the step (S3),
(S4-1) Blocking the passage connecting the water inlet pipe to be treated and the complex filtration tank, and transferring the water to be treated by bypassing the water supplied through the inlet pipe to the outside through the bypass pipe ;
(S4-2) discharging the treatment water in the fluidized bed filtration medium layer to the outside and storing it in a storage tank;
(S4-3) washing the fixed bed filtration medium layer by blowing air into the fixed bed filtration medium layer;
(S4-4) discharging contaminated water and solids in the fixed-phase filtration medium layer to the outside after the cleaning of the fixed-phase filtration medium layer is complete;
(S4-5) supplying the treated water stored in the storage tank into the composite filtration tank; and,
(S4-5) replenishing new water in the storage tank;
A control method of a hybrid biological filtration system in which the water treatment mode including (S1) to (S3) is performed again after executing the washing mode including. delete 11. The control method of a hybrid biological filtration system according to claim 10, wherein the step (S4-2) is stopped when the level of the water to be treated in the fluidized bed filtration medium layer reaches a predetermined level detected by a level sensor in the filtration tank. 11. The control method of a hybrid biological filtration system according to claim 10, wherein the step (S4-5) is stopped when the water level in the storage tank reaches a predetermined level detected by the storage tank level sensor. 11. The control method of a hybrid biological filtration system according to claim 10, wherein, when air is blown into the fixed bed filter medium layer in the step (S4-3), the fixed bed filter material is ultrasonically vibrated to remove solids adhering to the fixed bed filter medium and wash them.

Images