JP2010214243A - Deodorizing device and deodorizing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deodorizing device which can deodorize an odorous gas containing ammonia. <P>SOLUTION: This deodorizing device includes a carbon dioxide supply part, an ammonia supply part, a water supply part, and a filling column where a carbon dioxide supplied from the carbon dioxide supply part, ammonia supplied from the ammonia supply part and water supplied from the water supply part, are brought into contact with each other. A filling material of the filling column is stainless steel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a deodorizing apparatus and a deodorizing method for deodorizing odorous gas containing ammonia and carbon dioxide.
The odor component contained in this odor gas is, for example, a malodorous substance stipulated in the Odor Prevention Law, specifically ammonia, sulfur compounds, organic acids, etc., but here it is the main component of odor gas in particular. The present invention relates to a method for deodorizing ammonia.

  Livestock farms where poultry, pigs, cattle, and other livestock are raised, livestock excrement and livestock from these livestock farms, and compost production using these excreta Offensive odors generated from workplaces, factories, etc. cause troubles with neighboring residents and are a major problem affecting the lives of neighboring residents.

In particular, with the recent advancement of residential areas in the suburbs, the distance between livestock farms and factories and private houses tends to be closer, and the need for complete deodorization of off-flavors and odors is increasing.
In general, one pig in a pig farm is said to generate excrement for 10 humans, and pig farms that handle many pigs are struggling to respond to complaints from neighboring residents about the bad odor that occurs. Is the reality.

In addition, most of the livestock excreta are composted. Complaints from neighboring residents have been received regarding the intense odor generated from factories and workplaces that produce this compost, and deodorization is indispensable. ing.
As this deodorizing method and deodorizing apparatus, for example, a so-called biological deodorizing method using microorganisms has been proposed (see, for example, Patent Document 1).

The deodorization method described in Patent Document 1 is a method in which a gas containing an odor component is fed into a microorganism culture solution prepared to a required concentration, and this is bubbled to remove the odor component.
In this method, when removing the odor component in the microorganism culture solution, the microorganisms in the microorganism culture solution can be cultured and proliferated by supplying an energy source to the microorganism culture solution in which the microorganisms are reduced by the deodorizing action of the microorganism.
Then, by circulating the microorganism culture solution restored to the required concentration by the culture growth in the deodorizing apparatus, the odor gas containing the odor component by the microorganism culture solution always restored to the required concentration by the culture growth of the microorganism. Can be deodorized.

JP 2007-283239 A

  However, the deodorization method using microorganisms is difficult to process when the concentration of ammonia contained in the odor gas is high. For this reason, when the apparatus which generate | occur | produces the odor gas containing ammonia with a large air volume like the vertical rapid fermentation apparatus is used as a composting apparatus of livestock manure, it cannot apply.

  In addition, the deodorizing method using microorganisms has a problem that the deodorizing efficiency is extremely deteriorated if the treatment is not performed between 15 and 35 ° C., which is a suitable growth range of microorganisms, because the deodorizing effect is affected by temperature. . This is too low at the outdoor temperature in the severe cold season, and heat is generated by composting from the composting apparatus, so that it cannot be used as it is. Furthermore, if the exhaust gas discharged from the composting apparatus is dropped to room temperature, a large amount of moisture is generated, and this treatment becomes difficult.

  In order to solve the above-described problems, the present invention provides a deodorizing apparatus and a deodorizing method capable of deodorizing an odor gas containing ammonia.

  The deodorizing apparatus of the present invention includes a carbon dioxide supply unit, an ammonia supply unit, a water supply unit, carbon dioxide supplied from a carbon dioxide supply unit, ammonia supplied from an ammonia supply unit, And a packed tower in contact with water supplied from a water supply unit, and the filler of the packed tower is configured to include stainless steel.

  The deodorizing method of the present invention is characterized in that ammonia, carbon dioxide, and water are contacted in a packed tower using stainless steel as a filler.

According to the deodorizing apparatus and the deodorizing method of the present invention, ammonia and water are brought into contact with each other in a packed tower equipped with stainless steel as a filler, and ammonia and carbon dioxide are dissolved in condensed water. And since stainless steel is used for the filler, ammonia and carbon dioxide in the packed tower react quickly, so the solubility of ammonia in water becomes very large. Therefore, the exhaust from the packed tower does not substantially contain ammonia, and the odor gas can be deodorized.
In addition, because stainless steel is used as the filler, it operates even if the temperature in the deodorizing device is not low, so some of it is used as circulating water, and excess water is released into the atmosphere as it is, Excess water does not accumulate.

  According to the present invention, ammonia, which is a main component of odor, and carbon dioxide or carbonic acid in water are reacted in a packed tower using stainless steel as a filler, so that odor gas containing ammonia can be extremely effectively obtained. It can be deodorized.

It is a block diagram for demonstrating the deodorizing apparatus of embodiment of this invention. It is a block diagram for demonstrating the deodorizing apparatus used in experiment. A is a graph showing the ammonia concentration in the odor gas supplied to the apparatus for each hour and the concentration of ammonia contained in the exhaust gas. B is a graph showing the ammonia concentration and pH in the circulating water for each hour. It is the graph which measured the ammonia concentration contained in the odor gas supplied to the 2nd packed tower for every hour.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a block diagram of a deodorizing apparatus according to an embodiment of the present invention.
1 includes a composting device 11, a condensed water recovery device 12, a first water storage tank 13, a first packed tower 14, a second packed tower 15, a third packed tower 16, and A second water tank 17 is provided.

In the deodorizing apparatus 10, the composting apparatus 11 is used as a carbon dioxide supply unit and an ammonia supply unit. The composting apparatus 11 is an apparatus that is supplied with air from the outside, fertilizes livestock excrement (organic waste) in the apparatus, and composts it. As the composting apparatus 11, for example, a vertical rapid fermentation apparatus that continuously and aerobically fertilizes livestock excrement is used.
The composting device 11 is provided with an input port for livestock excrement provided in the upper part, an agitator for constantly or periodically stirring the livestock excrement input from the input port, and for supplying air from the outside into the device. It is provided with an air heater and an electric heater for air heating installed at an intermediate portion of the air duct.
A gas feed pipe 31 is connected to the upper part of the composting apparatus 11. The gas pipe 31 is connected from the composting device 11 to the condensed water recovery device 12 through the blower 25.

  In addition to the composting apparatus described above, for example, a carbon dioxide cylinder, a boiler or an engine that discharges carbon dioxide, or the like can be used as the carbon dioxide supply unit. In addition to the composting apparatus described above, ammonia water, an ammonia cylinder, or the like can be used as the ammonia supply unit.

  In the composting apparatus 11, when fermenting and drying livestock excreta, odorous gas containing ammonia as a main component and a small amount of other various organic acids is generated, and carbon dioxide and livestock excrement are dried. A large amount of water is generated. Then, by driving the blower 25, exhaust gas containing odor gas, carbon dioxide, moisture and the like generated in the composting device 11 is supplied to the condensed water recovery device 12 through the gas feed pipe 31.

  The exhaust gas containing ammonia, carbon dioxide, moisture, and the like supplied from the composting device 11 has moisture contained in the exhaust gas due to a slight temperature difference between the composting device 11 and the other components of the deodorizing device 10. Condenses. For this reason, the condensed water recovery device 12 recovers the condensed water. Further, the condensed water is recovered by the condensed water recovery device 12, whereby the exhaust gas supplied from the composting device 11 is separated into a gas such as ammonia or carbon dioxide and condensed water. Moisture that does not occur due to the temperature difference is released to the outside of the deodorizing apparatus 10 as it is.

  A pipe 32 and a gas pipe 34 are connected to the condensed water recovery device 12. The pipe 32 is connected from the condensed water recovery device 12 to the first water tank 13. This pipe 32 sends the condensed water separated from the exhaust gas supplied from the composting apparatus 11 to the first water tank 13. The gas feed pipe 34 is connected to the lower part of the first packed tower 14 from the condensed water recovery device 12.

  As described above, the deodorizing apparatus 10 has a configuration in which a condensed water recovery device is used as a water supply unit. However, in addition to the condensed water recovery device, a water supply unit from outside the device may be used in combination. it can. For example, in the deodorizing device, when the circulating water is insufficient with only the condensed water from the condensed water recovery device, water may be replenished from an external water supply unit. Further, for example, a configuration in which only the external water supply unit is provided without using the condensed water recovery device and water is supplied to the deodorization device 10 from the external water supply unit may be used.

The first water tank 13 collects the condensed water in the condensed water collection device 12 through the pipe 32.
A pipe 37, a pipe 38, and a gas feed pipe 33 are connected to the first water tank 13.
The pipe 37 supplies air from the outside into the first water tank 13 through the blower 18. The pipe 38 is connected to the spray nozzle 20 provided in the upper part of the third packed tower 16 from the first water tank 13. The gas feed pipe 33 is connected to the gas feed pipe 34 from the first water storage tank 13.
Moreover, the remainder supplied to the 3rd packed tower 16 among the condensed water collect | recovered by the 1st water tank 13 is drained by overflow.

In the condensed water collected in the first water tank 13, ammonia and carbon dioxide contained in the exhaust gas from the composting apparatus 11 are dissolved. When the ammonia concentration in the water is high, by driving the blower 18, air is supplied from the pipe 37 connected to the first water tank 13, and the condensed water collected in the first water tank is removed. It may be aerated with air. In that case, since the condensed water is aerated in the first water storage tank, ammonia, carbon dioxide and the like contained in the condensed water are supplied to the gas feeding pipe 34 through the gas feeding pipe 33.
The gas feed pipe 34 supplies the odor gas containing ammonia and carbon dioxide from the condensed water recovery device 12 and the gas feed pipe 33 to the lower part of the first packed tower 14.

  The 1st packed tower 14, the 2nd packed tower 15, and the 3rd packed tower 16 are connected in series by piping, respectively. These are counter flow contact type packed towers in which condensed water is supplied from above to below and odorous gas is supplied from below to above.

The first packed tower 14 is provided with a filler 26 in the tower. In addition, a spray nozzle 24 is disposed on the top of the packing material 26 of the first packed tower 14. A circulating water tank 45 is installed in the lower part of the first packed tower 14.
A gas feed pipe 34, a gas feed pipe 35, and an overflow pipe 41 are connected to the first packed tower 14. A circulating pipe 48 is connected to the circulating water tank 45. The gas feed pipe 35 is connected from the upper part of the first packed tower 14 to the lower part of the second packed tower 15. The overflow pipe 41 is connected to the second water storage tank 17 from the upper part of the circulating water tank 45 at the lower part of the first packed tower 14. A pipe 40 is connected to the spray nozzle 24 arranged at the upper part of the first packed tower 14. Further, a circulation pipe 48 from the circulating water tank 45 is connected to the pipe 40.

The second packed tower 15 is provided with a filler 27 in the tower. In addition, a spray nozzle 22 is disposed above the filler 27 of the second packed tower 15. A circulating water tank 44 is installed at the lower part of the second packed tower 15.
A gas feed pipe 35, a gas feed pipe 36, and a pipe 40 are connected to the second packed tower 15. A circulating pipe 47 is connected to the circulating water tank 44. The gas feed pipe 36 is connected from the upper part of the second packed column 15 to the lower part of the third packed column 16. The pipe 40 is connected to the spray nozzle 24 disposed in the first packed tower 14 through the pump 23 from the lower part of the second packed tower 15.
A pipe 39 is connected to the spray nozzle 22 arranged at the upper part of the second packed tower 15. A circulation pipe 47 from the circulating water tank 44 is connected to the pipe 39.

The third packed column 16 is provided with a packing material 28 in the column, and a spray nozzle 20 is disposed above the packing material 28 of the third packed column 16. A circulating water tank 43 is installed in the lower part of the third packed tower 16.
A gas feed pipe 36, a pipe 39, and an exhaust pipe 42 are connected to the third packed tower 16. A circulating pipe 46 is connected to the circulating water tank 43. The piping 39 is connected to the spray nozzle 22 disposed in the second packed tower 15 via the pump 21. A pipe 38 is connected to the spray nozzle 20 disposed at the upper part of the third packed tower 16. A circulation pipe 47 from the circulating water tank 46 is connected to the pipe 38.
The exhaust pipe 42 passes from the first packed tower 14 to the third packed tower 16, and the gas in which the concentration of the odor component is sufficiently reduced is exhausted.

The fillers 26, 27, and 28 are made of stainless steel.
As stainless steel, SUS304 and SUS316 can be used. It can be configured by only one of SUS304 and SUS316, or both can be used in combination. Furthermore, SUS304, SUS316, and other fillers can be used in combination.
For the shape of the packing material and the packing rate in the packed tower, the same configuration as that of the packing material used in the packed tower used for normal gas-liquid contact can be applied.

By using stainless steel, particularly SUS304, SUS316, as a filler, the reaction rate and reaction rate of ammonia and carbon dioxide in the packed tower can be improved as compared with a filler formed of ceramic or resin. .
Usually, when only ammonia is dissolved in water, it does not dissolve above the solubility of ammonia. However, by dissolving ammonia in water, it becomes ammonium hydroxide (ammonium ion). Further, part of the carbon dioxide dissolved by dissolving carbon dioxide in water becomes carbonic acid (carbonate ion).
Then, by dissolving ammonia and carbon dioxide in water, a neutralization reaction between ammonium hydroxide and carbonic acid occurs, and ammonium carbonate or ammonium hydrogen carbonate and a similar salt thereof are generated.
As described above, ammonia dissolved in water becomes ammonium carbonate or ammonium hydrogen carbonate and its similar salt through ammonium hydroxide, so that the ammonia concentration in water decreases. And since ammonia concentration in water fell, ammonia can melt | dissolve in water.
At this time, by using SUS304 or SUS316 as the filler, the reaction rate of carbon dioxide or carbonic acid and ammonia in water is improved. For this reason, the production amount of ammonium carbonate or ammonium hydrogen carbonate in water per contact time (average residence time) increases, and the ammonia concentration (nitrogen concentration) in water increases. For this reason, a larger amount of ammonia can be treated.
In addition, the solubility of ammonia is higher when the temperature is lower, but SUS304 and SUS316 are used as fillers, so that it can be effectively dissolved in water even at a higher temperature.

  The second water tank 17 stores water discharged from the lower portion of the first packed tower 14 through the overflow pipe 41. The water stored in the second water tank 17 is water in which ammonia and carbon dioxide contained in the odor gas are dissolved by gas-liquid contact in the packed tower. Further, this water contains ammonium carbonate or ammonium hydrogen carbonate, which is a reaction product of dissolved carbonic acid and ammonia, and a similar salt thereof.

  As described above, the deodorizing apparatus 10 condenses the carbon dioxide generated from the composting apparatus 11 and the water generated from the composting apparatus 11 when recovering ammonia in the packed tower. For this reason, ammonia which is the main component of the odor component generated from the composting apparatus 11 can be recovered without adding a substance for absorbing moisture from the outside or the odor component contained in the odor gas.

  Next, a method for deodorizing ammonia, which is the main component of the odor component, from the odor gas using the above-described deodorization apparatus 10 will be described. In the following description, the configuration of the deodorizing apparatus 10 will be described with the same reference numerals as those used in FIG.

  First, the exhaust from the composting apparatus 11 is supplied to the condensed water recovery apparatus 12 through the gas feed pipe 31 by driving the blower 25. Since the exhaust from the composting device 11 supplied to the condensed water recovery device 12 is cooled by the condensed water recovery device 12, moisture contained in the exhaust is condensed. That is, the exhaust from the composting apparatus 11 is normally exhausted at a temperature higher than the outside air temperature, but is included in the exhaust due to a slight temperature difference between the composting apparatus 11 and other configurations of the deodorizing apparatus 10. Moisture can be condensed.

  Next, the odor gas from which moisture has been removed by the condensed water recovery device 12 is discharged from the condensed water recovery device 12 through the gas feed pipe 34. Then, the water condensed in the condensed water recovery device 12 is recovered in the first water tank 13 through the pipe 32. Subsequently, the water collected in the first water tank is aerated by the blower 18 so that ammonia and carbon dioxide dissolved in the water are taken out as gases. Ammonia and carbon dioxide extracted by this aeration are supplied to the gas feed pipe 34 through the gas feed pipe 33.

Next, the odor gas containing ammonia and carbon dioxide separated in the condensed water recovery device 12 and the first water storage tank 13 by the gas feed pipe 34 is transferred to the lower portion of the filler 26 in the first packed tower 14, and Supply from above the circulating water tank 45. Then, the supplied odor gas passes through the filler 26 and is discharged from the gas feed pipe 35 connected to the upper portion of the first packed tower 14.
The odor gas discharged from the gas feed pipe 35 is supplied to the second packed tower 15 from below the filler 27 and from above the circulating water tank 44. Then, the supplied odor gas passes through the filler 27 and is discharged from the gas feed pipe 36 connected to the upper part of the second packed tower 15.
The odor gas discharged from the gas feed pipe 36 is supplied to the third packed tower 16 from below the filler 28 and from above the circulating water tank 43. The supplied odor gas passes through the filler 28 and is discharged into the atmosphere from the exhaust pipe 42 connected to the upper portion of the third packed tower 16.

Further, the condensed water collected in the first water storage tank 13 is supplied to the spray nozzle 20 disposed on the upper portion of the filler 28 of the third packed tower 16 through the pipe 19 through the pump 19. Then, the condensed water supplied to the spray nozzle 20 is jetted downward from the upper part of the filler 28. Further, the condensed water jetted from the spray nozzle 20 is stored in the circulating water tank 43. Then, by driving the pump 19, the condensed water stored in the circulating water tank 43 is supplied from the circulating pipe 46 to the pipe 38, and is again injected from the spray nozzle 20 to the third packed tower 16. As described above, the condensed water supplied from the first water storage tank 13 to the third packed tower 16 circulates in the third packed tower 16.
Further, the condensed water can be supplied almost uniformly to the filler 28 by spraying the condensed water with the spray nozzle 20.

  Further, the condensed water stored in the circulating water tank 43 is discharged from a pipe 39 connected to the lower part of the third packed tower 16. And the condensed water discharged | emitted from the piping 39 is supplied to the spray nozzle 22 arrange | positioned through the pump 21 at the upper part of the filler 27 of the 2nd packed tower 15. FIG. The condensed water supplied to the spray nozzle 22 is jetted downward from the upper portion of the filler 27. Further, the condensed water jetted from the spray nozzle 22 is stored in the circulating water tank 44. Then, by driving the pump 21, the condensed water stored in the circulating water tank 44 is supplied from the circulating pipe 47 to the pipe 39 and is again injected from the spray nozzle 22 to the second packed tower 15. As described above, the condensed water supplied from the third packed tower 16 circulates in the second packed tower 15 by the circulating water tank 44, the circulating pipe 47, the piping 39, and the spray nozzle 22.

  Further, the condensed water stored in the circulating water tank 44 is discharged from the pipe 40 connected to the lower part of the second packed tower 15. And the condensed water discharged | emitted from the piping 40 is supplied to the spray nozzle 24 arrange | positioned through the pump 23 at the upper part of the filler 26 of the 1st packed tower 14. The condensed water supplied to the spray nozzle 24 is jetted downward from the upper part of the filler 26. Further, the condensed water jetted from the spray nozzle 24 is stored in the circulating water tank 45. Then, by driving the pump 23, the condensed water stored in the circulating water tank 45 is supplied from the circulating pipe 48 to the pipe 40 and is again injected from the spray nozzle 20 to the second packed tower 15. As described above, the condensed water supplied from the second packed tower 15 circulates in the first packed tower 14 by the circulating water tank 45, the circulating pipe 48, the piping 40, and the spray nozzle 24.

  The condensed water sprayed from the spray nozzle 24 and stored in the circulating water tank 45 is discharged by overflow from an overflow pipe 41 connected to the upper part of the circulating water tank 45 in the lower part of the first packed tower 14. Then, the condensed water discharged from the overflow pipe 41 is collected in the second water tank 17.

As described above, the odor gas and the condensed water are brought into contact with each other in the packed tower by supplying the odor gas from the lower part of the packed tower and supplying the condensed water from the spray nozzle of the packed tower. In addition, since the packed tower is provided with a packing material, this packing material increases the contact area between the odor gas and the condensed water, improves the efficiency of gas-liquid contact, and reduces the ammonia and dioxide contained in the odor gas. Carbon can be efficiently dissolved in condensed water.
Furthermore, by using SUS304 or SUS316 as the filler, the reaction rate between ammonia and carbon dioxide or carbonic acid in the packed tower is improved as described above, and a large amount of ammonia can be treated.

  The odor gas supplied through the gas feed pipe 34 to the lower part of the first packed tower 14 includes ammonia and carbon dioxide having substantially the same concentration as the odor gas exhausted from the composting apparatus 11. The odor gas ammonia and carbon dioxide supplied from the gas feed pipe 34 are absorbed by the condensed water supplied from the spray nozzle 24. The condensed water supplied from the spray nozzle 24 is in contact with the odor gas in the third packed tower 16 and the second packed tower 15. For this reason, ammonia and carbon dioxide are already dissolved in the condensed water.

The odor gas supplied to the first packed tower 14 comes into contact with the condensed water supplied from the spray nozzle 24, whereby ammonia and carbon dioxide are dissolved in the condensed water. For this reason, the odor gas discharged from the upper portion of the first packed tower 14 through the gas feed pipe 35 has a lower concentration of ammonia, which is an odor component, than the odor gas in the gas feed pipe 34.
Moreover, the condensed water supplied from the spray nozzle 24 is dissolved in ammonia and carbon dioxide by contacting the odor gas in the first packed tower 14. Then, after being stored in the circulating water tank 45, ammonia and carbon dioxide dissolved in the condensed water can be concentrated by being supplied again from the circulating pipe 48 and the piping 40 into the first packed tower 14. For this reason, the condensed water discharged from the lower portion of the first packed tower 14 through the overflow pipe 41 has more ammonia and carbon dioxide dissolved therein than the condensed water supplied from the second packed tower 15.

  Similarly to the first packed tower 14 described above, in the second packed tower 15, the odor gas supplied from the lower portion of the second packed tower 15 and the condensed water supplied from the spray nozzle 22 come into contact with each other. To do. For this reason, the odor gas discharged from the second packed tower 15 through the gas feed pipe 36 has a lower concentration of ammonia, which is an odor component, than the odor gas supplied through the gas feed pipe 35. Further, the condensed water discharged from the second packed tower 15 through the pipe 40 is stored in the circulating water tank 44 and then supplied again from the circulating pipe 47 and the pipe 39 into the second packed tower 15. Thus, ammonia and carbon dioxide dissolved in the condensed water can be concentrated. For this reason, more ammonia and carbon dioxide are dissolved than the condensed water supplied from the third packed tower 16.

Further, in the third packed tower 16, the odor gas supplied from the lower part of the third packed tower 16 and the condensed water supplied from the spray nozzle 20 come into contact with each other. The condensed water supplied from the spray nozzle 20 is condensed water in the first water storage tank 13 or condensed water aerated in the first water storage tank 13. For this reason, ammonia is hardly dissolved in this condensed water. Then, the condensed water supplied from the spray nozzle 20 comes into contact with the odor gas supplied from the gas feed pipe 36 in the third packed tower 16, and ammonia and carbon dioxide contained in the odor gas are dissolved in the condensed water. To do. Further, after being stored in the circulating water tank 43, the ammonia and carbon dioxide dissolved in the condensed water are concentrated by being supplied again into the third packed tower 16 from the circulating pipe 46 and the pipe 38. For this reason, the condensed water discharged from the lower part of the third packed tower 16 through the pipe 39 has more ammonia and carbon dioxide dissolved therein than the condensed water supplied from the first water storage tank 13.
Further, the gas discharged from the third packed tower 16 through the exhaust pipe 42 is sufficiently reduced in concentration of the odor component because the odor component ammonia contained in the odor gas is dissolved in the condensed water by gas-liquid contact. is doing.

  In addition, a second water tank 17 is connected by an overflow pipe 41 from an upper part of a circulating water tank 45 installed at the lower part of the first packed tower 14. Then, the condensed water in which ammonia and carbon dioxide are dissolved at a high concentration in the first packed tower 14 is discharged from the lower portion of the first packed tower 14 through the overflow pipe 41 and collected in the second water storage tank 17. The The condensed water recovered in the second water tank 17 is a high concentration ammonium carbonate solution. In addition, ammonia, carbon dioxide, ammonium ions, and carbonate ions contained in the odor gas are dissolved in the condensed water.

  In this way, by using the first packed tower 14 to the third packed tower 16 to bring the odor gas and the condensed water into countercurrent contact in a multistage manner, the ammonia contained in the odor gas is absorbed by the condensed water. can do. As a result, the exhaust gas from the deodorizing apparatus 10 contains almost no ammonia, which is the main component of the odor component, so that the odor gas containing a high concentration odor component can be deodorized.

  Therefore, for example, in a composting apparatus that generates high-concentration ammonia such as a vertical rapid fermentation apparatus, ammonia generated from the composting apparatus is recovered using carbon dioxide and water generated from the composting apparatus. be able to. That is, by collecting ammonia, which is the main component of odor, from odor gas generated from the composting apparatus and reacting it with carbon dioxide or carbonic acid in water, high-concentration ammonium carbonate or ammonium hydrogen carbonate and similar salts thereof Solution is obtained. For this reason, by this deodorizing apparatus and deodorizing method, it can be set as exhaust which hardly contains ammonia which is the main component of odor.

In the above-described embodiment, in order to sufficiently reduce the ammonia concentration exhausted from the deodorization apparatus, the number of packed towers and the configuration of the packed towers for configuring the deodorization apparatus are determined according to the concentration of ammonia in the odor gas and the dioxide dioxide. It can be changed according to the carbon concentration.
For example, it is possible to change the specific surface area and packing ratio of the packing material of the packed tower, or to change the number of packed towers. Further, the gas-liquid contact between the condensed water and the odor gas in the packed tower may be either a cocurrent contact or a countercurrent contact. In this way, by changing the configuration of the deodorizing device as necessary, it is possible to optimize the absorption of ammonia and carbon dioxide by the condensed water and sufficiently reduce the concentration of ammonia exhausted from the deodorizing device.
In addition, if the filler is continuously filled, water will pass through a part of the filler, and the area required for the contact dissolution of moisture, ammonia and carbon dioxide will decrease. It is desirable to provide intermittently.

  Further, carbon dioxide may be supplied to the condensed water stored in the circulating water tanks 43, 44, 45 by microbubbles or air stones. The carbon dioxide concentration of the condensed water can be increased by dissolving the carbon dioxide in the condensed water stored in the circulating water tanks 43, 44, and 45 with microbubbles or air stones. Therefore, it is possible to efficiently dissolve ammonia in condensed water by gas-liquid contact with ammonia in the packed tower.

Hereinafter, the present invention will be described in detail by experimental examples.
The deodorizing apparatus used for experiment is shown in FIG. The deodorizing apparatus 50 shown in FIG. 2 includes an ammonia cylinder 59, a carbon dioxide cylinder 61, a blower 51, a first packed tower 62, a second packed tower 63, and circulating water tanks 64 and 70.

  Ammonia gas is supplied from the ammonia cylinder 59 to the deodorization apparatus 50, and carbon dioxide gas is supplied from the carbon dioxide cylinder 61 to the deodorization apparatus 50, and the air is diluted with the blower 51, so that the odor gas is simulated. . The ammonia gas supplied from the ammonia cylinder 59, the carbon dioxide gas supplied from the carbon dioxide cylinder 61, and the air sent from the blower 51 are mixed in the feed pipe 52, and are mixed into the first packed tower 62. Supplied from

The first packed tower 62 includes a filler 67 inside. In addition, a spray nozzle 65 is provided above the filler 67.
The first packed column 62 is supplied with a gas containing ammonia from a gas feed pipe 52 provided at the upper part of the filler 67, and is supplied with circulating water from a spray nozzle 65 provided at the upper part of the filler 67. It is a co-current contact type packed tower. As the packing material 67, a SUS304 metal scrubber was expanded in a ring shape, and a packing material using a punching metal or a cut material made of a cut nonwoven fabric was packed into the tower in five stages.

  Further, a gas feed pipe 53 and a pipe 54 are connected to the lower part of the packing material 67 of the first packed tower 62. The gas feed pipe 53 is connected from the lower part of the first packed column 62 to the upper part of the second packed column 63. Further, the gas supplied from the upper part of the first packed tower 62 and passing through the filler 67 is supplied to the upper part of the second packed tower 63 through the gas feed pipe 53. The pipe 54 is connected to the circulating water tank 64 from the lower part of the first packed tower 62. Further, the circulating water supplied from the spray nozzle 65 passes through the pipe 54 from the lower part of the first packed tower 62 and is collected in the circulating water tank 64.

The second packed tower 63 includes a filler 68 inside. Further, a spray nozzle 66 is provided above the filler 68.
The second packed tower 63 is supplied with a gas containing ammonia discharged from the first packed tower 62 from a gas feed pipe 53 provided at the upper part of the filler 68, and is also provided at the upper part of the filler 68. It is a co-current contact type packed tower to which circulating water is supplied from the spray nozzle 66.
As the packing material 68, a SUS304 metal scourer was spread in a ring shape, and a packing material using a punching metal or a cut nonwoven fabric was packed into the tower in five stages.
A pipe 55 is connected to the lower part of the second packed tower 63. The pipe 55 is connected to the circulating water tank 70 from the lower part of the second packed tower 63. In addition, the gas and the circulating water supplied from the upper part of the second packed tower 63 pass through the pipe 55 and are collected in the circulating water tank 70.

Circulating water is stored in the circulating water tanks 64 and 70.
A piping 57 is connected to the circulating water tank 64. The pipe 57 supplies the circulating water to the spray nozzle 65 disposed in the upper part of the first packed tower 62 via the pump 69. A piping 58 is connected to the circulating water tank 70. The pipe 58 supplies the circulating water to the spray nozzle 66 disposed in the upper part of the second packed tower 63 via the pump 60.
A piping 56 is connected to the circulating water tank 64. By driving the blower 51, the gas is discharged to the outside through the pipe 56 from the lower part of the second packed tower 63.

  Using the deodorizing apparatus 50 shown in FIG. 2, an experiment in which an experiment for absorbing an odor gas containing ammonia by circulating water was performed, and a metal cloth of SUS304 was cut as a filler. In this experimental example, the test was performed at room temperature in winter (about 3 to 15 ° C.).

In this experiment, the diameters of the first packed tower 62 and the second packed tower 63 were set to 150 mm as a deodorizing apparatus. Circulating water tanks 64 and 70 were prepared with 20 L of circulating water.
Further, as the packing materials 67 and 68 of the packed towers 62 and 63, a metal material of SUS304 is expanded in an annular shape and a space provided with a punching metal is formed, and a spare space of 10 cm from the top to the bottom is 1 m. 5 stages of fillers were filled so that In addition, as a comparative example, a nonwoven fabric cut into 8.3 cm was used as the fillers 67 and 68 of the packed towers 62 and 63.
The circulating water was sprayed from the spray nozzles 65 and 66 of the packed towers 62 and 63 at 5 L / min.
Further, the flow rate of ammonia from the ammonia cylinder 59 and the air volume of the blower 51 were set so that the ammonia concentration supplied to the first packed tower 62 would be an average of 1000 ppm. Further, the flow rate of the carbon dioxide cylinder 61 was set to be 10 times the flow rate of ammonia from the ammonia cylinder 59. Thereby, the odor gas discharged | emitted from a composting apparatus in pseudo was produced. Carbon dioxide was supplied from a carbon dioxide cylinder 61 so as to have a concentration about 10 times that of ammonia.
In addition, the ammonia concentration and the carbon dioxide concentration were measured using a detection tube at the measurement location of the deodorizing apparatus 50 shown in FIG.

  The result of the experiment is shown in FIG. FIG. 3A is a graph showing the ammonia concentration (ppm) contained in the exhaust gas from the deodorizer for each time (h) in each filler. FIG. 3B is a graph showing the ammonia concentration (ppm) and pH in the circulating water every time (h).

As shown in FIG. 3A, when the non-woven fabric was used, the ammonia concentration in the intake air and the exhaust gas became the same after 17 hours, so the experiment was terminated there. However, with SUS304 metal scrubber, the ammonia concentration in the exhaust is 400 ppm even after 24 hours.
Further, as can be seen from the result shown in FIG. 3B, although there is no difference in performance depending on the filler only by pH, the concentration of ammonia in water at the end of the nonwoven fabric is about 3900 ppm, but it increased to nearly 14000 ppm in the SUS304 metal scrubber.
From this result, by using stainless steel as a filler, the dissolution of ammonia in water was large, and ammonia could be deodorized efficiently.

Next, in the deodorizing apparatus 50 shown in FIG. 2 described above, the result when the odor passing through the piping of 52 is heated to 60 ° C. and the filler is dissolved in circulating water using SUS304 metal scrubber is shown. As shown in FIG.
In this experiment, the flow rate of ammonia from the ammonia cylinder 59 and the air volume of the blower 51 were set so that the ammonia concentration supplied to the first packed tower 62 would be an average of 1000 ppm.
Further, the flow rate of the carbon dioxide cylinder 61 was set to be 10 times the flow rate of ammonia from the ammonia cylinder 59. Thereby, the odor gas discharged | emitted from a composting apparatus in pseudo was produced. Carbon dioxide was supplied from a carbon dioxide cylinder 61 so as to have a concentration about 10 times that of ammonia.
Except these conditions, it carried out on the same conditions as the experiment which absorbs the above-mentioned ammonia by circulating water.
FIG. 4 is a graph obtained by measuring the ammonia concentration (ppm) contained in the odor gas supplied to the first packed tower 62 every time (h).

  As shown in FIG. 4, even if compared with FIG. 3, there is no significant performance difference. From this result, it is shown that SUS304 as a filler sufficiently acts even in high-temperature odor gas, and ammonia is taken into the circulating water. In addition, since it operates even when the temperature in the deodorizing apparatus is not low, surplus moisture of a part used as circulating water is released into the atmosphere as it is, and surplus moisture does not accumulate.

From the above experimental results, it can be seen that ammonia can be efficiently recovered with water by using stainless steel as a filler.
Even after 24 hours from the start of the experiment, the ammonia concentration contained in the exhaust gas discharged from the deodorizing device could be reduced to about 400 ppm, and the ammonia concentration in the circulating water could be increased to 14000 ppm. Therefore, ammonia, which is the main component of the odor component, can be almost removed from the exhaust gas discharged from the deodorization apparatus, and the odor gas can be deodorized.

  The present invention is not limited to the configuration described in the above-described embodiment, and various modifications and changes can be made without departing from the configuration of the present invention.

  DESCRIPTION OF SYMBOLS 10,50 Deodorization apparatus, 11 Composting apparatus, 12 Condensate recovery apparatus, 13 1st water tank, 14,62 1st packed tower, 15,63 2nd packed tower, 16 3rd packed tower, 17 Second water tank, 18, 25, 51 blower, 19, 21, 23, 60, 69 pump, 20, 22, 24, 65, 66 spray nozzle, 26, 27, 28, 67, 68 filler, 31, 33, 34, 35, 36, 52, 53 Gas pipe, 32, 38, 39, 40, 54, 55, 56, 57, 58 Pipe, 41 Overflow pipe, 42 Exhaust pipe, 43, 44, 45, 64, 70 Circulating water tank, 46, 47, 48 Circulating pipe, 59 Ammonia cylinder, 61 Carbon dioxide cylinder

Claims (5)

A carbon dioxide supply,
An ammonia supply section;
A water supply,
The carbon dioxide supplied from the carbon dioxide supply unit, the ammonia supplied from the ammonia supply unit, and a packed tower for contacting the water supplied from the water supply unit,
A deodorizing apparatus, wherein the packing material of the packed tower includes stainless steel.   The deodorizing apparatus according to claim 1, wherein the stainless steel contains at least one selected from SUS304 and SUS316.   The deodorizing apparatus according to claim 1, wherein the carbon dioxide supply unit and the ammonia supply unit are composting apparatuses.   The deodorizing apparatus according to claim 3, wherein the water supply unit is a heat exchanger connected to an exhaust side from the compost vaporizer.   A deodorizing method comprising contacting ammonia, carbon dioxide, and water in a packed tower using stainless steel as a filler.

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