JP4602446B2 - Automatic denitrification system for closed waters - Google Patents

Description

  The present invention relates to an automatic denitrification system for closed water areas that can automatically reduce nitric acid in closed water areas such as aquaculture, sacrifice, and ornamental fish display to convert it into nitrogen gas. Part of the water in the closed water system is taken into the denitrification circulation tank. If nitric acid is present in the water taken into the denitrification circulation tank, the denitrification treatment is repeated until the nitric acid is exhausted, and after the nitric acid is exhausted. The water in the denitrification circulation tank is returned to the closed system water area, which makes it possible to keep the nitric acid concentration in the closed system water area constant at a low value without dealing with water exchange. About the system.

  As is well known, when raising seafood in closed waters such as aquaculture, sacrifice, and ornamental fish display, ammonia nitrogen generated from waste products and food residues from seafood is toxic. Since it is strong, the accumulation of ammonia nitrogen is not allowed in order to prevent the killing of the fish and shellfish reared. For this reason, these closed waters are generally oxidized ("nitrified") to nitrate nitrogen which is less toxic by treatment with aerobic bacteria called biofiltration.

  And as the concrete method, for example, while putting the cinnabar sand as a filtering material in the filter device body, aerobic bacteria are attached to the cinnabar sand to constitute the filter device, and by the pump, In general, water is circulated while passing through the filtration device.

  Then, toxic substances such as ammonia contained in the aquarium water are nitrified by aerobic bacteria in the process of passing through the filtration device, and change into nitrate nitrogen having low toxicity.

  By the way, although nitrate nitrogen is weakly toxic, adverse effects occur when the concentration is excessively increased and the concentration becomes high, and therefore, a certain allowable range is set for the concentration. On the other hand, nitric acid is the final substance of nitrification, and it accumulates in closed waters. Therefore, if the concentration of nitrate nitrogen exceeds the allowable range, the water must be changed.

  However, for example, in the case of aquaculture, ginger, large-sized ornamental fish display, etc., it can be pointed out that the labor, time, cost, etc. required for the water replacement work are large.

  Therefore, the present invention, when raising seafood in closed water areas such as aquaculture, ginger, ornamental fish display, etc., completely suppresses the increase in nitric acid concentration, without responding to the change of water, An object of the present invention is to provide an automatic denitrification system in a closed water system that makes it possible to keep the nitric acid concentration constant at a low value.

The automatic denitrification system for closed water areas of the present invention is
An automatic denitrification system for closed water areas,
A denitrification circulation tank for taking in water in a closed water body,
A denitrification tower for reducing nitric acid contained in water taken into the denitrification circulation tank and converting it into nitrogen gas;
Water filling means for taking water in a closed system water area into the denitrification circulation tank;
A circulation means for circulating water in the denitrification circulation tank while passing through the denitrification tower;
Extrusion means for returning the water in the denitrification circulation tank to the closed water area;
Nitric acid concentration detection means for detecting the concentration of nitric acid contained in the water in the denitrification circulation tank, disposed in the denitrification circulation tank,
A water level detecting means for detecting a water level in the denitrification circulation tank, disposed in the denitrification circulation tank;
A heater disposed in the denitrification circulation tank;
Control means for controlling the operation of the entire system ,
The denitrification tower is filled with a bacteria implantation part for implanting anaerobic bacteria and a biodegradable polymer as a nutrient of the anaerobic bacteria, and by passing water containing nitric acid. Nitric acid contained in water can be reduced and converted to nitrogen gas,
Incorporating water in a closed water area into the denitrification circulation tank by the water filling means,
By circulating the water in the denitrification circulation tank with the denitrification tower by the circulation means, the nitric acid contained in the water in the denitrification circulation tank is reduced and converted to nitrogen gas,
It is possible to return the water in the denitrification circulation tank not containing nitric acid to the closed water body by the extrusion means.

  When anaerobic bacteria (“denitrifying bacteria”) respirate nitrate under anaerobic conditions, nitrate is reduced and converted to nitrogen gas (this is called “denitrification”), but the closure of the present invention. In the automatic denitrification system of the system water area, the denitrification circulation tank for taking in the water in the closed system water area and the nitric acid contained in the water taken into the denitrification circulation tank are reduced and converted to nitrogen gas A denitrification tower, water filling means for taking the water in the closed system water area into the denitrification circulation tank, and circulation means for circulating the water in the denitrification circulation tank through the denitrification tower, The denitrification tower has an extrusion means for returning the water in the denitrification circulation tank to the closed system water area, and the denitrification tower has a bacteria implantation part for implanting the anaerobic bacteria, and nutrients for the anaerobic bacteria. Nitric acid is reduced by filling the inside with biodegradable polymer and passing water containing nitric acid. Nitrogen gas can be converted to nitrogen gas, and in this configuration, a water filling step for taking a part of the water in the closed water area into the denitrification circulation tank, and the nitric acid in the denitrification circulation tank is reduced to nitrogen gas. A circulation process to be converted and an extrusion process to return the water in the denitrification circulation tank not containing nitric acid to the closed system water area when nitric acid is not contained in the water in the denitrification circulation tank . Therefore, according to the present invention, when raising seafood in closed water areas such as aquaculture, ginger, ornamental fish display, etc., the increase in nitric acid concentration is completely suppressed, and the closed water area does not respond by changing water. It is possible to keep the nitric acid concentration in the inside constant at a low value.

  At this time, in the present invention, the denitrification tower is filled with a biodegradable polymer as a nutrient of the denitrification bacteria, which is an anaerobic bacterium, so that the denitrification bacteria can be reliably propagated in the denitrification tower. Is possible.

  Moreover, in the automatic denitrification system for closed system water areas of the present invention, a water filling process for moving a part of the water in the closed system water area to the denitrification circulation tank, and a circulation process for circulating the water in the denitrification circulation tank; In the circulation process, oxygen is not introduced from the outside into the denitrification tower, and residual oxygen is immediately depleted and anaerobic by oxygen respiration of aerobic bacteria. Therefore, it is possible to quickly increase the denitrification activity of anaerobic bacteria in the denitrification tower.

  In the automatic denitrification system for closed water areas according to the present invention, a denitrification circulation tank for taking in water in closed water areas such as aquaculture, sacrifice, and ornamental fish display, and a closure taken into this denitrification circulation tank A denitrification tower for reducing nitric acid contained in water in the system water area to convert it into nitrogen gas, and a water filling means for taking the water in the closed system water area into the denitrification circulation tank, and a denitrification tower A circulation means for circulating the water taken into the denitrification circulation tank, and an extrusion means for returning the water in the denitrification circulation tank to the closed water area.

  And in the denitrification circulation tank, nitric acid concentration detection means for detecting the concentration of nitric acid contained in the water in the denitrification circulation tank, and water level detection means for detecting the water level in the denitrification circulation tank, A heater for maintaining the water temperature in the denitrification circulation tank above a certain level is provided, and these nitric acid concentration detection means, heater and water level detection means are connected to the control means.

  In addition, the denitrification tower is filled with a bacteria implantation part for implanting anaerobic bacteria and a biodegradable polymer as nutrients for anaerobic bacteria, and allows water containing nitric acid to pass through. Therefore, it has a function of reducing nitric acid and converting it to nitrogen gas.

  And in such a configuration, the automatic denitrification system for a closed water area of the present invention takes the water of the closed water area into the denitrification circulation tank by water filling means and performs water filling, and after the water filling, the inside of the denitrification circulation tank When the nitric acid is present in the water, the water in the denitrification circulation tank is circulated with the denitrification tower, thereby reducing the nitric acid contained in the water in the prenitrification circulation tank to reduce nitrogen. When the gas is converted to gas and the nitric acid is not contained in the water in the denitrification circulation tank, the water in the denitrification circulation tank is returned to the closed system water area by the extrusion means.

  Here, the operation of the water filling means, the circulation means, and the extrusion means is automatically controlled by the control means, whereby the water filling step, the circulation step, and the extrusion step may be automatically executed, thereby minimizing the minimum amount. Each process can be performed with effort.

  As an example of automatic control, for example, when the water level detection means detects a decrease in the water level in the denitrification circulation tank, the water filling means takes in water in the closed system water area into the denitrification circulation tank and detects the nitric acid concentration. When the means detects nitric acid in the water in the denitrification circulation tank, the water in the denitrification circulation tank is circulated between the denitrification tower by the circulation means until the detected nitric acid concentration reaches 0 mg / L. However, when the nitric acid concentration detection means does not detect the nitric acid concentration, a method of returning the water in the denitrification circulation tank to the closed system water area through the extrusion means is conceivable. According to this, the detection result by the nitric acid concentration detection means Each process can be automatically executed according to the above.

  In addition, using a timer or the like, the control means may automatically control the operation of the water filling means, the circulation means, and the extrusion means based on the time set by the timer.

Furthermore, the water filling means, the circulation means, and the extrusion means may each be constituted by independent paths, but in addition, the circulation means for supplying water in the denitrification circulation tank to the denitrification tower, Water that has been denitrified by passing through a denitrification tower, a first circulation channel in which a base end communicates with a denitrification circulation tank and a tip communicates with a denitrification tower, and a circulation pump is interposed at an arbitrary position. The base end communicates with the denitrification tower and the top end communicates with the second circulation channel that communicates with the denitrification circulation tank. The extrusion means comprises a water-filled flow path that communicates with the water area and has a distal end connected to the first circulation flow path via the first three-way valve. Comprising a flow path for extrusion connected to the second flow path for circulation through two three-way valves,
When water in a closed system water area is taken into the denitrification circulation tank, switching between the first three-way valve and the second three-way valve causes the denitrification circulation tank and the denitrification tower to be connected with the first circulation channel. The communication is cut off, the closed water area and the denitrification tower are communicated by the water-filling flow path and the first circulation flow path, and the denitrification tower and the denitrification circulation tank are communicated by the second circulation flow path. The water in the closed system water area is taken into the denitrification circulation tank via the water filling channel, a part of the first circulation channel, the denitrification tower, and the second circulation channel,
When circulating the water in the denitrification circulation tank, the first three-way valve and the second three-way valve are switched so that the denitrification circulation tank and the denitrification tower communicate with each other through the first circulation channel. The denitrification tower and the denitrification circulation tank are communicated with each other through the circulation path, and the water in the denitrification circulation tank is circulated through the first circulation path, the denitrification tower, and the second circulation path. ,
When returning the water in the denitrification circulation tank to the closed system water area, the denitrification circulation tank and the denitrification tower are communicated by the first circulation channel by switching between the first three-way valve and the second three-way valve, The communication between the denitrification tower and the denitrification circulation tank by the second circulation channel is cut off, and the denitrification tower and the closed water system are communicated by the second circulation channel and the extrusion channel, The denitrification tower, the denitrification tower, a part of the second circulation channel, and the extrusion channel, the water in the denitrification circulation tank may be pushed out to the closed system water area, It is possible to reduce the cost by simplifying the configuration of the entire system.

  Further, as the biodegradable polymer packed in the denitrification tower, a polymer derived from vegetable oil may be used, whereby a highly safe denitrification system can be obtained.

  An embodiment of an automatic denitrification system (hereinafter simply referred to as “automatic denitrification system”) according to the present invention will be described with reference to the drawings. FIG. 1 illustrates the entire automatic denitrification system of this embodiment. 1 is an automatic denitrification system of the present embodiment.

  In FIG. 1, reference numeral 2 denotes a water tank as a closed system water area, and the automatic denitrification system of this embodiment is intended to automatically denitrify nitric acid contained in the water in the water tank 2.

  Here, the water tank 2 will be described. A filtration device 301 using aerobic bacteria is connected to the water tank 2 through a circulation path 302. A filtration pump 303 for circulating the water is interposed, and the aquarium water is circulated through the filtration device 301 by the action of the filtration pump 303. In addition, since the filtration apparatus using this aerobic bacterium is conventionally well-known, detailed description is abbreviate | omitted. In FIG. 1, reference numeral 402 denotes aeration, and reference numeral 401 denotes an air stone for generating aeration.

  Next, 5 is a denitrification circulation tank in the figure. That is, the automatic denitrification system of this embodiment has a denitrification circulation tank, and a part of the water in the water tank 2 is taken into the denitrification circulation tank 5.

  In the present embodiment, the denitrification circulation tank 5 includes a nitric acid concentration detection means 6 for detecting the concentration of nitric acid contained in the water taken into the denitrification circulation tank 5, and a denitrification circulation tank 5. A water level detecting means 7 for detecting the water level of the taken-in water is provided, and further, a heater 8 for maintaining the temperature of the water in the denitrification circulation tank 5 at a certain level or more is provided. In this embodiment, a nitrate ion meter is used as the nitric acid concentration detecting means 6 and a float switch is used as the water level detecting means 7.

  Next, 9 is a denitrification tower in the figure. That is, in this embodiment, the denitrification tower 9 is provided. In this denitrification tower 9, nitric acid contained in the water taken into the denitrification circulation tank 5 is reduced and converted to nitrogen gas. Yes.

  That is, under anaerobic conditions, denitrifying bacteria, which are anaerobic bacteria, respire nitrate, thereby denitrifying the action of reducing nitric acid to nitrogen gas. In the automatic denitrification system of this embodiment, The water in the denitrification circulation tank 5 is circulated through the denitrification tower 9, thereby eliminating nitric acid contained in the water taken into the denitrification circulation tank 5 by denitrification. .

  Here, the denitrification tower 9 will be described. FIG. 2 is a diagram for explaining the configuration of the denitrification tower 9 in the present embodiment. In the present embodiment, the denitrification tower 9 is a cylindrical container. (“Column”) 901 is configured by alternately filling a bacteria implantation unit 902 for implanting denitrifying bacteria as anaerobic bacteria and a biodegradable polymer 903 as a nutrient of the denitrifying bacteria in a sandwich shape. In addition, cinnabar sand capable of efficiently depositing denitrifying bacteria is used as the bacterial implantation part 902.

  And in this structure, when the water containing nitric acid passes through the inside of the denitrification tower 9, it is possible to reduce the nitric acid contained in the water and convert it into nitrogen gas by the action of the denitrifying bacteria. .

  In the present example, as the biodegradable polymer, a polymer derived from vegetable oil is used, thereby ensuring safety. In other words, because of the use of natural raw materials, the chemicals that should be a concern for the farmed fish are not trapped, the risk to humans is extremely low, and the impact of chemicals on the fish itself is extremely low, closing There is an advantage that the load on the environment is extremely low when water in the system water area flows out of the closed system.

  In addition, in this example, as the biodegradable polymer derived from vegetable oil, the trade name Matterby KF-01U / 130 manufactured by Novamont of Italy is used, thereby preventing generation of hydrogen sulfide.

  That is, for example, when seawater is subjected to anaerobic conditions, sulfuric acid is reduced by the anaerobic bacterium, sulfate-reducing bacteria, so that highly toxic hydrogen sulfide may be generated. It may be killed. However, as a result of experiments by the inventor, no hydrogen sulfide was generated when the above-mentioned Matterby KF-01U / 130 was used as a biodegradable polymer. Therefore, in the automatic denitrification system of this embodiment using the Matterby KF-01U / 130 as a biodegradable polymer, even when seawater is circulated, no toxic hydrogen sulfide is generated.

  In addition, since the denitrifying bacteria have extremely low activity when the water temperature falls below 25 ° C., the speed of denitrification slows down. Therefore, in this embodiment, the heater 8 is placed in the denitrification circulation tank 5 as a countermeasure for the water temperature in winter. The water temperature in the system can be kept at 25 ° C. or higher.

  In the figure, reference numeral 11 denotes a circulation means. That is, in this embodiment, the circulation means 11 circulates the water in the denitrification circulation tank 5 between the denitrification tower 9 and reliably denitrifies by this circulation.

  Here, in this embodiment, the circulation means 11 has a first circulation channel 1101, and the first circulation channel 1101 communicates with the denitrification circulation tank 5 at the base end. The other end communicates with the denitrification tower 9, and a circulation pump 1102 is interposed in the middle. With this configuration, by operating the circulation pump 1102, the water in the denitrification circulation tank 5 can be supplied to the denitrification tower 9 through the first circulation channel 1101.

  The circulation means 11 has a second circulation channel 1103, one end of which communicates with the denitrification tower 9 and the other end of the denitrification channel 1103. The water in the denitrification circulation tank 5 is supplied to the denitrification tower 9 by passing through the denitrification tower 9 by operating the circulation pump 1102. The denitrified water can be returned to the denitrification circulation tank 5.

  Therefore, according to the present embodiment, the water in the denitrification circulation tank 5 is circulated while passing through the denitrification tower 9 only by operating the circulation pump 1102, and thereby the denitrification circulation tank. Since the water in 5 can be denitrified, it is possible to completely suppress the increase in the concentration of nitric acid in the water tank and keep the nitric acid concentration constant at a low value without dealing with the water exchange.

  Next, in the figure, reference numeral 10 denotes water filling means for taking the water in the water tank 2 into the denitrification circulation tank 5 and filling the denitrification circulation tank 5, and in this embodiment, the water filling means 10 is: The base end is a water filling channel 1101 communicating with the water tank 2. The tip of the water filling channel 1101 is connected to the first circulation channel 1101 via the first three-way valve 14a.

  In the figure, 12 is an extruding means for returning the water in the denitrification circulation tank 5 to the water tank 2, and in this embodiment, the extruding means 12 is an extrusion channel whose tip communicates with the water tank 2. 1201. The proximal end of the extrusion flow channel 1201 is connected to the second circulation flow channel 1103 via the second three-way valve 14b.

  And, by taking the water in the water tank 2 into the denitrification circulation tank 5 and filling the denitrification circulation tank 5 with this configuration, by switching between the first three-way valve 14a and the second three-way valve 14b, The communication between the denitrification circulation tank 5 and the denitrification tower 9 by the first circulation channel 1101 is blocked, and the water filling channel 1001 and the water filling channel 1001 in the first circulation channel 1101 The denitrification tower 9 and the denitrification tower 9 are communicated with each other by a portion on the tip side of the connection portion, and the denitrification tower 9 and the denitrification circulation tank 5 are communicated with each other through the second circulation channel 1103.

  Then, when the circulation pump 1102 is operated in this state, the water in the water tank 2 is more distal than the connection portion between the water filling channel 1001 and the water filling channel 1001 in the first circulation channel 1101. This portion, the denitrification tower 9 and the second circulation channel 1103 are sequentially passed through and taken into the denitrification circulation tank 5, whereby the denitrification circulation tank 5 can be filled with water.

  On the other hand, when the water in the denitrification circulation tank 5 is returned to the water tank 2, the denitrification tower 9 and the denitrification tower 9 by the second circulation channel 1103 are removed by switching the first three-way valve 14a and the second three-way valve 14b. The communication with the nitrogen circulation tank 5 is cut off, and the portion of the second circulation channel 1103 closer to the extrusion channel 1201 than the connection point with the extrusion channel 1201 and the extrusion channel 1201 are used to remove the detachment. The nitriding tower 9 and the water tank 2 are communicated, and the denitrification circulation tank 5 and the denitrifying tower 9 are communicated by the first circulation channel 1101.

  Then, when the circulation pump 1102 is operated in this state, the water in the denitrification circulation tank 5 is used for extrusion in the first circulation channel 1101, the denitrification tower 9, and the second circulation channel 1103. The portion of the base end side with respect to the connection point with the flow path 1201 and the flow path for extrusion 1201 are sequentially passed back to the water tank 2, whereby water in the denitrification circulation tank 5 can be extruded.

  Next, in the figure, reference numeral 13 denotes a control panel containing control means. In the automatic denitrification system 1 of this embodiment, the control means performs the water filling, circulation, and extrusion steps, and the entire system. The operation is controlled.

  Here, the control system of the automatic denitrification system 1 of the present embodiment will be described with reference to the block diagram of FIG. 3. The automatic denitrification system 1 of the present embodiment has a microcomputer as the control means 15. The control means 15 is connected to the nitrate ion meter 6, the heater 8, the float switch 7, and the circulation pump 1102. In the present embodiment, electric three-way valves are used as the first and second three-way valves 14a and 14b. The first and second three-way valves 14a and 14b are also connected to the control means 15, and In addition, an operation switch 16, a power source, and the like are connected to the control means 15.

  Then, the control means 15 controls the first and second three-way valves 14a and 14b and the circulation pump 1102, and when the float switch 7 detects a drop in the water level in the denitrification circulation tank 5, the water filling described above is performed. When the nitrate ion meter 6 detects the nitric acid concentration in the water taken into the denitrification circulation tank 5, the above-mentioned circulation is performed, and when the nitrate ion meter 6 no longer detects the nitric acid concentration, the extrusion described above is performed. Further, in winter, the heater 8 is operated to maintain the water temperature in the denitrification circulation tank 5 at 25 ° C. or higher.

  Next, an automatic denitrification method using the automatic denitrification system 1 of the present embodiment configured as described above will be described with reference to the flowchart of FIG. Water filling the nitrogen circulation tank 5 is performed. That is, in step 1, the control means 15 controls the first and second three-way valves 14a and 14b and the circulation pump 1102 to perform the above-mentioned water filling, and denitrifies and circulates an appropriate amount of water in the water tank 2. Take into tank 5.

  Next, when the nitrate ion meter 6 detects nitric acid, in step 2, the control means controls the first and second three-way valves 14a and 14b and the circulation pump 1102 until the nitric acid concentration becomes 0 mg / L. The above-described circulation is performed to denitrify the water in the denitrification circulation tank 5.

  Then, after the nitric acid concentration in the denitrification circulation tank 5 becomes 0 mg / L, or when the nitrate ion meter 6 does not detect nitric acid after the water filling in Step 1, the control means 15 The first and second three-way valves 14 a and 14 b and the circulation pump 1102 are controlled to perform the above-described extrusion, and the water in the denitrification circulation tank 5 is returned to the water tank 2.

  And after the water level in the denitrification circulation tank 5 falls by extrusion of step 3, the said step 1 to step 3 is repeatedly performed, and, thereby, denitrification of the water in the water tank 2 is performed automatically.

  As described above, according to the automatic denitrification system of the present embodiment, it is possible to denitrify water in the aquarium, so that seafood is raised in closed water areas such as aquaculture, sacrifice, and ornamental fish display. In this case, it is possible to keep the nitric acid concentration in the closed water area constant at a low value without performing water exchange.

  In addition, since the denitrification tower for performing denitrification is filled with a biodegradable polymer as an nutrient for anaerobic bacteria, it is possible to reliably propagate the anaerobic bacteria in the denitrification tower. .

  Furthermore, since the water filling process for transferring a part of the water in the water tank to the denitrification circulation tank and the circulation process for circulating the water in the denitrification circulation tank are batch-processed as separate processes, denitrification is performed. It is possible to quickly increase the denitrification activity of anaerobic bacteria in the tower.

  That is, for example, when seawater rich in residual oxygen is taken into the denitrification circulation tank 5 and water filling is performed, oxygen enters the denitrification circulation tank 5. At this time, in general, denitrifying bacteria are breathable anaerobic bacteria, unlike knitted anaerobic bacteria that die when exposed to even a small amount of oxygen. Activity becomes weak. Therefore, for example, when water filling and circulation are performed in parallel, oxygen is successively supplied into the denitrification circulation tank 5, so that the activity of the denitrifying bacteria cannot be increased and effective denitrification is performed. It becomes difficult to do.

  However, in this example, since the water filling step and the circulation step are batch-processed as separate steps, in the circulation step, oxygen does not enter the denitrification tower from the outside, and aerobic bacteria The water taken into the denitrification circulation tank 5 by oxygen breathing due to oxygen respiration is depleted of residual oxygen immediately and becomes anaerobic, so it is possible to quickly increase the denitrification activity of anaerobic bacteria in the denitrification tower. is there.

  Further, in this embodiment, water filling of the denitrification circulation tank, denitrification circulation of water in the denitrification circulation tank, and extrusion of the water in the denitrification circulation tank to the water tank are automatically performed by control of the control means. It is possible to keep the nitric acid concentration in the closed water area constant at a low value with a minimum of effort.

  In the automatic denitrification system 1 described above, the water filling means 10 has a water filling means in which the base end communicates with the water tank 2 and the tip is connected to the first circulation channel 1101 via the first three-way valve 14a. The extrusion means 13 is composed of a flow path 1001 and the extrusion means 13 has a distal end communicating with the water tank 2 and a proximal end coupled to the second circulation flow path 1103 via a second three-way valve 14b. A case has been described in which the entire system is simplified by using a part of the circulation means 11 during water filling and extrusion, but is not necessarily configured in this manner. For example, FIG. As shown in FIG. 6, the water filling means 10 and the extrusion means 12 may be configured separately from the circulation means 11.

  That is, in FIG. 5, the water filling means 10 is interposed between a water filling channel 1001 having a base end communicating with the water tank 2 and a tip communicating with the denitrification circulation tank 5, and an arbitrary portion of the water filling channel 1001. The extrusion means 12 includes an extrusion flow path 1201 having a proximal end communicating with the denitrification circulation tank 5 and a distal end communicating with the water tank 2, and an arbitrary portion of the extrusion flow path 1201. It is comprised with the pump 1202 for extrusion interposed in. Then, as shown in the block diagram of FIG. 6, the water filling pump 1002 and the extrusion pump 1202 are connected to the control means 15, and the control means 15 operates the water filling pump 1002 to perform extrusion when water filling is performed. When performing, it is supposed to operate the pump for extrusion.

  The automatic denitrification system 11 shown in FIG. 5 is characterized in that the water filling means 10 and the extrusion means 12 are configured separately from the circulation means 11, and the other points are the automatic denitrification systems shown in FIGS. Since it is the same as that of the system 1, the redundant description is omitted and the same components are denoted by the same reference numerals.

  However, it is not always necessary to adopt the configuration shown in FIG. 5, and the water filling means 10 only needs to be able to take the water in the closed water area 2 into the denitrification circulation tank 5, and the circulation means 11 can be removed. It is only necessary that the water in the denitrification circulation tank 5 can be circulated while passing through the nitrogen tower 9, and the extrusion means 12 can return the water in the denitrification circulation tank 5 to the closed system water area 2. That's fine. That is, a water filling means for taking water in the closed system water area into the denitrification circulation tank, a circulation means for circulating the water in the denitrification circulation tank while passing through the denitrification tower, and a denitrification circulation tank What is necessary is just to have the extrusion means for returning water to a closed system water area.

  In the above-described embodiment, the method in which the control unit controls the first and second three-way valves 14a and 14b and the circulation pump 1102 based on the detection result by the nitrate ion meter 6 has been described. For example, with a timer, water filling time, circulation time, and extrusion time are set in advance, and based on the set time, the control means uses the first and second three-way valves 14a and 14b and the circulation pump. A method of controlling 1102 may be adopted, or the operations of the first and second three-way valves 14a and 14b and the circulation pump 1102 may be controlled manually.

  According to the automatic denitrification system of the present invention, it is possible to keep the nitric acid concentration in the closed water area constant at a low value without performing water exchange. Applicable in general.

It is a figure for demonstrating the whole system of the Example of the automatic denitrification system of the closed water area of this invention. It is a figure for demonstrating the denitrification tower in the Example of the automatic denitrification system of the closed water area of this invention. It is a figure for demonstrating the control system of the Example of the automatic denitrification system of the closed water area of this invention. It is a flowchart for demonstrating the Example of the automatic denitrification method of the closed water area of this invention. It is a figure for demonstrating the whole system of the other form of the automatic denitrification system of the closed water area of this invention. It is a figure for demonstrating the control system in the system shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Automatic denitrification system 2 Water tank 301 Filtration apparatus 302 Circulation path 303 Filtration pump 401 Air stone 402 Aeration 5 Denitrification circulation tank 6 Nitrate ion meter 7 Float switch 8 Heater 9 Denitrification tower 901 Column 902 Bacterial implantation part 903 Biodegradable polymer 10 Water filling means 1001 Water filling flow path 1002 Water filling pump 11 Circulation means 1101 First circulation flow path 1102 Circulation pump 1103 Second circulation flow path 12 Extrusion means 1201 Extrusion flow path 1202 Extrusion pump 13 Control panel 14a First three-way valve 14b Second three-way valve 15 Control means 16 Operation switch 17 Power supply

Claims (6)

An automatic denitrification system for closed water areas,
A denitrification circulation tank (5) for taking in water in the closed water area (2);
A denitrification tower (9) for reducing nitric acid contained in water taken into the denitrification circulation tank (5) and converting it into nitrogen gas;
Water filling means (10) for taking water in the closed water area (2) into the denitrification circulation tank (5);
A circulation means (11) for circulating water in the denitrification circulation tank (5) while passing through the denitrification tower (9);
Extrusion means (12) for returning the water in the denitrification circulation tank (5) to the closed water area (2);
A nitric acid concentration detection means (6) disposed in the denitrification circulation tank (5) for detecting the concentration of nitric acid contained in the water in the denitrification circulation tank (5);
A water level detecting means (7) disposed in the denitrification circulation tank (5) for detecting the water level in the denitrification circulation tank (5);
A heater (8) disposed in the denitrification circulation tank (5);
Control means (15) for controlling the operation of the entire system ,
The denitrification tower (9) is filled with a bacteria implantation part (902) for implanting anaerobic bacteria and a biodegradable polymer (903) as a nutrient of the anaerobic bacteria. By passing water containing water, the nitric acid contained in the water can be reduced and converted to nitrogen gas,
The water in the closed system (2) is taken into the denitrification circulation tank (5) by the water filling means (10),
Nitric acid contained in the water in the denitrification circulation tank (5) by circulating the water in the denitrification circulation tank (5) between the circulation means (11) and the denitrification tower (9). Reduced to nitrogen gas,
An automatic denitrification system for a closed water system that enables the water in the denitrification circulation tank (5) not containing nitric acid to be returned to the closed water system (2) by the extrusion means (12).   The operation of the water filling means (10), the circulation means (11), and the pushing means (12) is automatically controlled by the control means (15). Automatic denitrification system. Under the control of the control means (15),
When the water level detection means (7) detects a decrease in the water level in the denitrification circulation tank (5), the water filling means (10) causes the denitrification circulation tank (5) to enter the closed system water area (2). Take in water,
When the nitric acid concentration detection means (6) detects nitric acid in the water in the denitrification circulation tank (5), the circulation means (11) causes the nitric acid concentration to be 0 mg / L. Circulating the water in the denitrification circulation tank (5) between the denitrification tower (9),
When the nitric acid concentration detection means (6) does not detect the nitric acid concentration, the water in the denitrification circulation tank (5) is returned to the closed water area (2) via the extrusion means (12). The automatic denitrification system for closed water areas according to claim 2.   The control means (15) automatically controls operations of the water filling means (10), the circulation means (11), and the extrusion means (12) based on a preset time. Item 3. An automatic denitrification system for closed water bodies according to Item 2. The circulation means (11) has a proximal end communicating with the denitrification circulation tank (5) and a distal end for supplying water in the denitrification circulation tank (5) to the denitrification tower (9). The denitrification tower (9) was denitrified by passing through the denitrification tower (9) and the first circulation channel (1101) in which a circulation pump (1102) was interposed at an arbitrary position. A second circulation channel (with a proximal end communicating with the denitrification tower (9) and a distal end communicating with the denitrification circulation tank (5) for returning water to the denitrification circulation tank (5) 1103), and
The water filling means (10) has a base end communicating with the closed water area (2) and a tip connected to the first circulation channel (1101) via a first three-way valve (14a). A flow path (1001),
The extruding means (12) has an end communicating with the closed water body (2) and a base end connected to the second circulation channel (1103) via a second three-way valve (14b). Provided with a flow path (1201),
When water in the closed water system is taken into the denitrification circulation tank (5), a first circulation channel (by switching between the first three-way valve (14a) and the second three-way valve (14b)) 1101), the communication between the denitrification circulation tank (5) and the denitrification tower (9) is cut off, and the closed water area (1001) and the first circulation flow path (1101) 2) and the denitrification tower (9) are communicated, and the denitrification tower (9) and the denitrification circulation tank (5) are communicated by the second circulation channel (1103). ), A part of the first circulation channel (1101), the denitrification tower (9), and the second circulation channel (1103) to dewater the water in the closed water area (2). (5)
When circulating the water in the denitrification circulation tank (5), the first circulation channel (1101) is switched by switching the first three-way valve (14a) and the second three-way valve (14b). The denitrification circulation tank (5) and the denitrification tower (9) are communicated with each other, and the denitrification tower (9) and the denitrification circulation tank (5) are communicated with each other by the second circulation channel (1103). The water in the denitrification circulation tank (5) is circulated through the first circulation channel (1101), the denitrification tower (9), and the second circulation channel (1103),
When the water in the denitrification circulation tank (5) is returned to the closed system water area (2), the first three-way valve (14a) and the second three-way valve (14b) are switched to switch the first circulation. The denitrification circulation tank (5) and the denitrification tower (9) are communicated by a flow path (1101),
The communication between the denitrification tower (9) and the denitrification circulation tank (5) by the second circulation channel (1103) is blocked, and the second circulation channel (1103) and the extrusion channel ( 1201), the denitrification tower (9) and the closed water system (2) are communicated, and the first circulation channel (1101), the denitrification tower (9), and the second circulation channel (1103). The water in the denitrification circulation tank (5) is pushed out to the closed system water area (2) through a part of the flow path and the extrusion flow path (1201). An automatic denitrification system for closed waters as described in Crab.   The automatic denitrification system for a closed water system according to any one of claims 1 to 5, wherein the biodegradable polymer (903) packed in the denitrification tower (9) is a polymer derived from vegetable oil. .

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