JP5202208B2 - Deodorizing system, deodorizing apparatus and deodorizing method - Google Patents

Description

  The present invention relates to a deodorizing system, a deodorizing apparatus, and a deodorizing method using a cleaning water treatment apparatus.

In a foundry, a deodorizing system for deodorizing a gas containing an odor component generated in a casting process or the like is used. As a conventional deodorizing system, there is known a chemical liquid deodorizing treatment system that removes malodorous components in gas by bringing a gas containing an odorous component into contact with a chemical liquid.
However, according to the chemical liquid deodorization treatment system, since deleterious substances such as sulfuric acid and caustic soda are used as chemical liquids, it requires labor to manage the system, and the waste liquid and waste after treatment are also harmful. There was a problem that it was necessary to take. In addition, there is a problem that the apparatus constituting the system is enlarged, energy loss is large, and the facility environment in the factory is deteriorated.
In recent years, in addition to such problems, consideration for global environmental protection has come to be regarded as important, and photocatalytic deodorization systems using environmentally friendly photocatalysts have attracted attention, and various proposals have been made.
For example, in Patent Document 1, the water contaminated by the photocatalyst is decomposed and circulated to the deodorizing device, and the water having deteriorated adsorption efficiency is filtered and circulated to the deodorizing device, etc. A deodorizing system suitable for a foundry or the like that generates a large amount of odor gas has been disclosed, and has a certain effect.
JP 2008-62129 A

However, although the deodorizing system of Patent Document 1 has a certain effect, it cannot be said that an ideal circulation cycle can be realized. In other words, the deodorization system cannot cope with the case where the degradation rate of the treated water is faster than the decomposition rate of the odorous component by the photocatalyst, and may cause a waste product of water (degraded water) that has deteriorated remarkably. It has also been proposed to separate the degraded water by filtration using a reverse osmosis membrane (RO membrane: Reverse Osmosis) and return it to purified water, but depending on the degree of degradation of the degraded water, the RO membrane may become clogged in a short period of time. There is also a problem that it ends up. In addition, there are foundries that impose strict conditions on themselves, such as “exhaust odor concentration of 300 or less” to “100 or less” in consideration of local communities. In order to realize such conditions, further improvement in the deodorizing ability is required, and it has been clarified that deodorizing by regular clean water is indispensable for the improvement.
Then, this invention is made | formed in view of the above problems, and it aims at providing the deodorizing system which is excellent in the circulation and reusability of water, and can implement | achieve an ideal circulation cycle.

In order to achieve the above object, a deodorizing system according to the present invention sprinkles water into a gas to be treated containing an odor component and a solid component, removes the odor component and the solid component from the gas to be treated, and discharges a clean gas. A deodorizing device, a separation device that separates water sprayed into the treated gas into purified water and concentrated water, and an electrolyzing device that purifies the concentrated water by electrolysis, wherein the deodorizing device A first watering means for mainly removing solid components by sprinkling water, a retention means for retaining the water sprinkled in the gas to be treated by the first watering means, and a retention for sending the retained water to the separation device Water separation means and second watering means for mainly removing odorous components by sprinkling the gas to be treated from which solid components have been removed, and the separation device passes the water that has passed through the reverse osmosis membrane. Separation means that separates purified water and concentrated water Includes a purified water circulation means for circulating the separated purified water to the second water sprinkling means of the deodorizing apparatus, and a concentrated water supply means for water the separated concentrated water to the electrolyzer, said electrolyzer, Electrolytic means for purifying the concentrated water sent by electrolysis, and stagnant water circulation means for circulating the purified water to the stay means of the deodorizing device , wherein the first watering means is circulated to the stay means. It is characterized by sprinkling the staying water on the gas to be treated .
As a result, purified water and concentrated water are separated by the action of the RO membrane and the purified water is reused for sprinkling, and the concentrated water with increased electrolyte concentration is purified by electrolysis and circulated as stagnant water. The ability is maintained and effective deodorization becomes possible, and a deodorization system that efficiently reuses water is realized.
Here, it is preferable that the deodorizing apparatus further includes a concentration adjusting unit that adjusts an electrolyte concentration of water retained in the retaining unit.
As a result, the electrolyte concentration of water circulating in the system is adjusted within a predetermined range, so that it can be operated continuously without causing clogging of the RO membrane. It is possible to realize a deodorizing system that is excellent in terms of operation cost.
The present invention can also be realized as a single deodorizing device. That is, a deodorizing apparatus that sprays cleaning water onto a gas to be treated containing an odor component and a solid component, removes the odor component and the solid component from the gas to be treated, and discharges a clean gas. A first watering part that mainly removes solid components by watering, a second watering part that mainly removes odorous components by watering the gas to be treated from which the solid components have been removed, and a first watering part. A retention part that retains water sprinkled in the gas to be treated, a separation part that separates the retained water into purified water and concentrated water by passing through a reverse osmosis membrane, and the separated purified water in the second and purified water circulation unit for circulating the nozzle unit includes a electrolysis unit for purifying by electrolysis the separated concentrated water, the accumulated water circulation unit for circulating the purified water to the retention portion, the first nozzle unit is , Water circulated and retained in the retention part is sprinkled into the gas to be treated It may be a deodorizing apparatus according to claim.
Furthermore, the present invention is a deodorization method for removing a odorous component and a solid component from a gas to be treated containing an odorous component and a solid component, and discharging a clean gas, which is mainly sprinkled with the gas to be treated. The first sprinkling step for removing water, the second sprinkling step for mainly removing odor components by sprinkling the treated gas from which the solid component has been removed, and the treated water in the first sprinkling step . A retention step for retaining water, a separation step for separating the retained water into purified water and concentrated water by passing through a reverse osmosis membrane, and reusing the separated purified water for watering in the second watering step and purified water circulating step for the electrolysis step to purify by electrolysis the separated concentrated water, clarified water only contains the retained water circulating step of staying again with water, which is sprinkled into the gas to be treated, said first The water step can also be implemented as a deodorizing method characterized by sprinkling water which is retained again in the residence water and the retained water circulation step in the residence step the gas to be treated.

  As described above, according to the deodorizing system according to the present invention, the purified water is separated and reused as water spray by the action of the RO membrane, and the separated concentrated water is purified by electrolysis and circulated again as retained water. An ideal circulation cycle deodorization system can be realized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of a deodorizing system according to an embodiment of the present invention.
The deodorization system 1 removes spear components, dust, and sand contained in the gas generated from the shell machine and the low pressure casting machine, and removes odor components (eg, ammonia, formaldehyde, phenol, etc.) contained in the gas. It is a system that does not bromide and discharges it to the atmosphere. The deodorization system 1 includes a deodorization device 2, an RO separation device 3, and an electrolysis device 4.
The deodorizing device 2 is a device that takes in the gas to be treated and does not bromide, and discharges the non-brominated gas (clean gas). The deodorizing device 2 includes a suction unit 5, a sprinkling unit 6, a staying unit 7, and a discharge unit 10.
The suction means 5 has a function of taking in a gas to be processed that is generated by a shell machine or the like and blown by a blower or the like into the system, and is realized by, for example, a suction fan.
The water sprinkling means 6 has a function of sprinkling cleaning water into the gas to be treated, and adsorbing and removing odor components and solid components such as dust and sand contained in the gas to be treated by the water nozzle. .
The retention means 7 is specifically a tank or the like, and has a function of retaining dirty water containing odor components as a result of water spraying by the water spraying means 6. The electrolyte concentration adjusting means 8 and the retained water water supply means 9 and.
The electrolyte concentration adjustment means 8 has a function of adjusting the electrolyte concentration of the water (retention water) retained by the retention means 7, for example, an electrolyte concentration sensor, a valve for injecting water for concentration adjustment, and opening / closing of the valve This is realized by a control device or the like that controls
The staying water feeding means 9 has a function of feeding staying water to the RO separation device 3. Although it may be realized only by a pipe through which the accumulated water is naturally passed, it is preferably realized by a pump for pumping.
The discharge means 10 has a function of discharging the gas to be treated (clean gas) from which odor components have been removed by sprinkling in the sprinkling means 6 to the outside air, and specifically corresponds to a blower fan.
The RO separation device 3 is a device that separates the retained water sent from the deodorizing device 2 into purified water and concentrated water, and includes RO separation means 11, purified water circulation means 12, and concentrated water supply means 13.
The RO separation means 11 has a function of separating water (treated water) sent from the staying water supply means 9 into purified water and concentrated water in which impurities are concentrated by the action of the RO membrane, and uses the RO membrane. Realized by a filtration device.
The purified water circulation means 12 has a function of circulating the separated purified water to the water spray means 6. Although a pump for pumping purified water may be used as the purified water circulation means 12, it can also be realized with only a pipe for allowing natural water flow using the water pressure from the pump used as the staying water supply means 9. .
The concentrated water supply means 13 has a function of supplying the separated concentrated water to the electrolyzer 4. A pump for pumping concentrated water may be used as the concentrated water circulation means 13, but it may be realized only by a pipe for allowing natural water to flow using the water pressure from the pump used as the retained water water feeding means 9. it can.
The electrolyzer 4 is an apparatus for purifying concentrated water sent from the RO separator 3 by electrolysis, and includes an electrolyzer 14 and a staying water circulator 15.
The electrolysis means 14 has a function of purifying the concentrated water sent from the concentrated water supply means 13 by electrolysis, and is realized by an electrolysis apparatus having electrodes and the like.
The staying water circulation means 15 has a function of circulating the water purified by electrolysis to the staying means 7 as staying water. A pump for pumping the staying water may be used as the staying water circulation means 15, but it may be realized only with a pipe for allowing natural water to flow using the water pressure from the pump used as the staying water feeding means 9. it can.
FIG. 2 is a diagram schematically showing an outline of a configuration example of the deodorizing system 1 having the above function.
As shown in FIG. 2, the deodorization system 1 is roughly divided into a deodorization device 20, an RO separation device 30, and an electrolysis device 40.
The deodorizing device 20 is a device corresponding to the deodorizing device 2 in FIG. 1, and includes a suction port 21 corresponding to the suction means 5, watering nozzles 22 a and 22 b corresponding to the watering means 6, a gas-liquid contact material 24, and mist collection. And a deodorizing device tank 23 corresponding to the staying means 7, an exhaust port 26 corresponding to the discharging means 10, a concentration sensor 27 and a concentration control device 28 corresponding to the electrolyte concentration adjusting means 8.
The inlet 21 is an inlet for the gas to be processed. For example, the gas to be processed is taken into the deodorizing apparatus 20 by the suction force of the fan.
The watering nozzle 22a and the watering nozzle 22b are nozzles for watering the gas to be treated. The water spray from the water spray nozzle 22 a mainly removes solid components such as sand and dust mixed in the gas to be treated taken in from the suction port 21, and the water spray from the water spray nozzle 22 b passes through the gas-liquid contact material 24. Purified water is sprinkled on the gas to be treated to remove mainly odor components. Although the configuration will be described in detail later, it is desirable to circulate the purified water from the RO separation device 30 only to the watering nozzle 22b. The flow rate of purified water circulated from the RO separation device 30 is limited, and it is important to use purified water for removing odorous components. This is because it is sufficient to pipe the water to the watering nozzle 22a for watering.
The stagnant water tank 23 is a tank for storing stagnant water containing a predetermined electrolyte material (for example, NaCl) while being contaminated with odor components and the like by sprinkling water. The stagnant water stored in the tank is stored in the concentration sensor 27. Further, the electrolyte concentration is adjusted to be within a certain range by the concentration control device 28, and water is sent to the RO separation device 30 by the pump 52.
The gas-liquid contact material 24 is a filler for efficiently bringing the purified water sprayed from the water spray nozzle 22b into contact with the gas to be treated, and is, for example, a plastic filler.
The mist collection | recovery material 25 is a member which enlarges the particle size of the mist-like water contained in the to-be-processed gas (clean gas) non-brominated by the watering nozzle 22b and the gas-liquid contact material 24, and absorbs a water | moisture content, for example A mesh filter.
The exhaust port 26 is a discharge port for clean gas, and discharges clean gas from which moisture has been separated by the mist collecting material 25 by blowing air from a fan, for example.
The concentration sensor 27 is a sensor for detecting the electrolyte concentration of the accumulated water, and the concentration control device 28 sets the electrolyte concentration of the accumulated water in the accumulated water tank 23 within a predetermined range based on the measured value of the concentration sensor 27. It is a device to adjust to.
For example, when the electrolyte is sodium chloride (NaCl), the amount of residual chlorine is measured using an oxidation-reduction potentiometer (ORP meter) and a conductivity meter as the concentration sensor 27, and the measured value is multiplied by a predetermined coefficient. It is possible to calculate the electrolyte concentration. The electrolyte concentration of the accumulated water adjusted here is 1% to 3.5%. This is because if the electrolyte concentration is made too thin, the electrolysis capability of the electrolyzer 40 described later will be lowered, and the electric power required for electrolysis will increase and the running cost will increase. On the other hand, if the electrolyte concentration is too high, the RO membrane in the RO separation device 30 to be described later may be clogged and the life of the RO membrane may be shortened. RO membranes are generally applied to seawater desalination technology, and the salt concentration of seawater is preferably about 3.5%, so that the electrolyte concentration of stagnant water is preferably less than 3.5%. The electrolyte concentration of the staying water is determined by an ORP control device corresponding to the concentration control device 28 to control the opening and closing of the valve 51 to dilute the electrolyte concentration, industrial water, which is purified water, and saturated salt to concentrate the electrolyte concentration. It is possible to adjust by flowing water into the accumulated water tank 23.
The deodorizing apparatus 20 configured as described above is continuously operated so that the gas to be treated is sequentially taken from the suction port 21, odorous components and solid components are removed by sprinkling of purified water, and discharged as clean gas. . The gas to be treated moves downward by the watering of the watering nozzle 22a, changes its direction on the water surface of the stagnant water tank 23, moves upward, that is, toward the gas-liquid contact material 24, and moves to the watering nozzle 22b. After being sprinkled, it is discharged from the exhaust port 26 as clean gas through the mist collecting material 25. At this time, water that contains odor components or the like by watering the watering nozzle 22a and the watering nozzle 22b, that is, the water staying, is stored in the water storage tank 23, and the electrolyte concentration is adjusted continuously or intermittently. It is sent to the RO separation device 30 by the pump 52 that operates. Note that the timing at which the pump 52 corresponding to the stagnant water feeding means in FIG. 1 is operated may be continuous operation, or may be a point in time when the operation of the deodorizing device 20 has passed a predetermined time, for example, in the deodorizing device 20 A color sensor may be provided at the time when the discoloration of the washing water exceeds a predetermined standard. The operation of the pump 52 may be performed manually, or the deodorizing device 20 is provided with a control means for the pump 52, and after the timer measures a predetermined time or the color sensor detects a liquid color that exceeds a predetermined reference. Later, the pump 52 may be operated.
The RO separation device 30 is a device corresponding to the RO separation device 3 in FIG. 1 and is a device that separates water sent from the deodorization device 20 into purified water and concentrated water. The RO separation device 30 separates water (treated water) sent from the deodorization device 20 by the pump 52 into concentrated water in which impurities are concentrated and purified water not containing impurities by filtration using the action of the RO membrane. The separated purified water is circulated to the deodorizing device 20 through a pipe 53 corresponding to the purified water circulation means 12 of FIG. 1 and reused for watering in the watering nozzle 22b. Since the adsorptive power of odor components by watering, that is, deodorizing ability, depends on the cleanliness of the water sprayed, separating purified water and reusing it for watering contributes to an ideal circulation cycle. On the other hand, the concentrated water is sent to the electrolyzer 40 through a pipe 54 corresponding to the concentrated water feeding means 13 in FIG.
The electrolyzer 40 is an apparatus corresponding to the electrolyzer 4 in FIG. 1, and is an apparatus for purifying concentrated water sent from the RO separator 30 by electrolysis. When the electrolyte concentration of water to be electrolyzed is dilute, the electrolysis electrode is generally increased in size and required power is increased, but the electrolyzer 40 in the present embodiment is an electrolyte. Since the concentrated water obtained by concentrating and separating the staying water adjusted to have a concentration within the predetermined range by the RO separation device 30 is electrolyzed, facilities such as electrodes can be reduced in size and the required power can be reduced. The water purified by electrolysis in the electrolyzer 40 is sent to the accumulated water tank 23 of the deodorizer 20 through a pipe 55 corresponding to the accumulated water circulation means 15 in FIG. 1, and circulates in the system as accumulated water. become.
Next, the procedure for circulating water in the deodorizing system 1 constituted by the above devices will be described with reference to the drawings.
FIG. 3 is a flowchart showing a water circulation procedure in the deodorization system 1.
First, when purified water is sprinkled from the sprinkling nozzles 22a and 22b to the gas to be treated (step S10), water adsorbing odor components and the like is stored in the stagnant water tank 23. The water in the stagnant water tank 23 (residual water) is checked as needed to determine whether the electrolyte concentration is within a predetermined range. If the concentration is outside the predetermined range (No in step S11), the water in the stagnant water tank 23 is stored. Purified water or saturated saline is added to adjust the concentration (step S12).
The staying water whose electrolyte concentration is adjusted within a predetermined range is sent to the RO separation device (Yes in Step S11) and separated into purified water and concentrated water by the action of the RO membrane (Step S13). The separated purified water is reused for watering from the watering nozzle 22b and circulated in the system, and the separated concentrated water is sent to the electrolyzer 40 (step S14).
The concentrated water is purified by electrolysis in the electrolyzer 40 (step S15) and then returned to the accumulated water tank 23 to circulate in the system as accumulated water (step S16).
And the deodorizing system 1 repeats such a water circulation procedure until it stops driving | operation (loop A).
As described above, in the deodorization system 1 according to the present embodiment, in the deodorization apparatus 20, purified water is sprinkled on the gas to be treated to adsorb the odorous components and the like, thereby deodorizing the gas to be treated and adsorbing the odorous components and the like. The adjusted water is allowed to stay while adjusting the electrolyte concentration, and is appropriately sent to the RO separation device 30. In the RO separation device 30, the sent water is separated into purified water and concentrated water, the separated purified water is circulated through the deodorizing device 20 and reused for water spraying to the gas to be treated, and the concentrated water is electrolyzed. Water is sent to 40. In the electrolyzer 40, the sent concentrated water is purified by electrolysis, is circulated through the deodorizer 20, and is retained again.
Since the deodorizing system 1 having such a configuration separates purified water by filtration through an RO membrane and reuses it for spraying, it is possible to maintain the deodorizing capability at a high level and realize an efficient deodorizing treatment. Can do. Further, since the separated concentrated water is purified by electrolysis and circulated again as retained water, it is possible to realize an ideal circulation cycle without generating waste of deteriorated water that has deteriorated remarkably. . Furthermore, because the electrolyte concentration is adjusted within the specified range, continuous operation is possible without causing clogging of the RO membrane, and a deodorizing system with excellent electrolysis equipment and operating costs has been realized. can do.
The deodorizing system according to the present invention has been described above based on the embodiment. However, the present invention is not limited to this, and various objects can be achieved without departing from the spirit of the present invention. Design changes are possible and all fall within the scope of the present invention.
For example, although salt (NaCl) is used as the electrolyte material in the above embodiment, other electrolyte materials such as potassium hydroxide or dilute sulfuric acid may be used. Further, it goes without saying that the range of the electrolyte concentration controlled according to the type of the electrolyte material is different (the range is about 0.3 to 3.5% depending on the electrolyte). Moreover, in the said embodiment, although one pump and a pipe are used as a water supply means between each apparatus, this arrangement | positioning is only an example and you may arrange | position a pump between each apparatus.
Furthermore, in this Embodiment, although the structure of the deodorizing system which isolate | separated the deodorizing apparatus, RO separation apparatus, and the electrolysis apparatus was shown, you may comprise as one apparatus.
In FIG. 4, the functional structural example of the deodorizing apparatus which integrated these is shown. Each part of FIG. 4 corresponds to each means or each device in FIG. That is, the suction part 62 is the suction means 5, the watering part 65 is the watering means 6, the staying part 66 is the staying means 7, the electrolyte concentration adjusting part 67 is the electrolyte concentration means 8, the RO separation part 68 is the RO separation device 3, and the electrolysis part. 69 corresponds to the electrolysis apparatus 4 and the discharge unit 64 corresponds to the discharge means 10, and since each means and each apparatus has already been described, the description thereof is omitted here.
In addition, the RO separation device and the electrolysis device may be integrated to separate only the deodorization device.

  The deodorization system according to the present invention is useful as a deodorization system for industrial-related devices that generate odor gas such as a coating device and a plating device, and in particular, a deodorization system for a low-pressure casting machine such as a casting plant that generates a large amount of odor gas. It is suitable as.

It is a block diagram which shows the functional structure of a deodorizing system. It is a figure which shows typically the outline of the structural example of a deodorizing system. It is a flowchart which shows the circulation procedure of the water in a deodorizing system. It is a block diagram which shows the functional structure of a deodorizing apparatus.

DESCRIPTION OF SYMBOLS 1 Deodorizing system 2, 20, 61 Deodorizing device 3, 30 RO separation device 4, 40 Electrolysis device 5 Inhalation means 6 Sprinkling means 7 Retention means 8 Electrolyte concentration adjustment means 9 Retention water supply means 10 Discharge means 11 RO separation means 12 Purified water Circulating means 13 Concentrated water feeding means 14 Electrolysis means 15 Stagnating water circulating means 21 Suction ports 22a, 22b Sprinkling nozzles 23 Stagnating water tank 24 Gas-liquid contact material 25 Mist collection material 26 Exhaust port 27 Concentration sensor 28 Concentration control device 51 Valve 52 Pump 53, 54, 55 Pipe 62 Suction part 63 Deodorization part 64 Discharge part 65 Sprinkling part 66 Retention part 67 Electrolyte concentration adjustment part 68 RO separation part 69 Electrolysis part

Claims (4)

A deodorizing device that sprinkles the gas to be treated containing the odor component and the solid component, removes the odor component and the solid component from the gas to be treated, and discharges the clean gas;
A separation device that separates water sprayed into the gas to be treated into purified water and concentrated water;
An electrolyzer for purifying the concentrated water by electrolysis,
The deodorizing device is
A first watering means for sprinkling the gas to be treated to mainly remove solid components; a retaining means for retaining the water sprinkled by the gas to be treated by the first watering means; and the separator for separating the retained water. And a second watering means for mainly removing odor components by watering the gas to be treated from which the solid components have been removed ,
The separation device includes:
Separation means for separating the sent water into purified water and concentrated water by passing through a reverse osmosis membrane;
Purified water circulating means for circulating the separated purified water to the second watering means of the deodorizing device;
Concentrated water feeding means for feeding the separated concentrated water to the electrolyzer,
The electrolyzer is
Electrolysis means for purifying the sent concentrated water by electrolysis;
A staying water circulating means for circulating the purified water to the staying means of the deodorizing device ,
The first watering means sprays the water that is circulated and retained in the staying means to the gas to be treated . The deodorization system according to claim 1, wherein the deodorization apparatus further includes a concentration adjustment unit that adjusts an electrolyte concentration of water retained in the retention unit. A deodorizing apparatus that sprays cleaning water onto a gas to be treated containing an odor component and a solid component, removes the odor component and the solid component from the gas to be treated, and discharges a clean gas,
A first watering part for mainly removing solid components by watering the gas to be treated ;
A second sprinkling part that mainly sprinkles odorous components by sprinkling the gas to be treated from which the solid components have been removed;
A retention part for retaining the water sprinkled in the gas to be treated in the first watering part ;
A separation unit that separates the retained water into purified water and concentrated water by passing through a reverse osmosis membrane;
A purified water circulation part for circulating the separated purified water to the second watering part;
An electrolysis section for purifying the separated concentrated water by electrolysis;
A staying water circulation part for circulating the purified water to the staying part ,
Said 1st watering part sprinkles the water which is circulated and stagnated in the said retention part to to-be-processed gas, The deodorizing apparatus characterized by the above-mentioned. A deodorizing method for removing a odorous component and a solid component from a gas to be treated containing the odorous component and a solid component and discharging a clean gas,
A first watering step for mainly removing solid components by watering the gas to be treated;
A second watering step for mainly removing odorous components by sprinkling the gas to be treated from which the solid components have been removed;
A residence step for retaining the water sprinkled in the gas to be treated in the first watering step ;
A separation step of separating the retained water into purified water and concentrated water by passing through a reverse osmosis membrane;
A purified water circulation step for reusing the separated purified water for watering in the second watering step;
An electrolysis step for purifying the separated concentrated water by electrolysis;
The clarified water and the retained water circulating step of again staying with the water which is sprinkled into the processed gas seen including,
In the first watering step, the water detained in the staying step and the water retained again in the staying water circulation step are sprinkled into the gas to be treated .