Odor suppression method and odor suppression system

Abstract

Provided are an odor suppression method and an odor suppression system that are capable of effectively deactivating urease.　This odor suppression method involves emitting, on an object surface on which urease remains, ultraviolet light having a main emission wavelength belonging to a wavelength band of 200-235 nm. In addition, this odor suppression system comprises a light source that emits ultraviolet light having a main emission wavelength belonging to the wavelength band of 200-235 nm. The light source emits the ultraviolet light to an object surface on which urease remains. The light source is incorporated in an object constituting the object surface, or at a place adjacent to the object.

Description

Odor suppression method and odor suppression system

[0001] The present invention relates to a method and system for odor control.

[0002] In public restrooms, etc., the generation of odors due to products such as ammonia and amines caused by residual urea is a problem. For example, it is known that ammonia is produced by the reaction of urea with urease, a metabolic product of bacteria.

[0003] Japanese Patent Application Laid-Open No. 2006-255290

[0004] Urease cannot be inactivated by ethanol, hypochlorous acid, etc. Furthermore, surfactants that can inhibit urease activity are known (for example, Patent Document 1 below), but these surfactants are not effective unless they are in contact with urease for a long period of time, making them impractical.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an odor control method and an odor control system that can effectively deactivate urease.

[0006] The odor suppression method according to the present invention is characterized in that the surface of an object on which urease remains is irradiated with ultraviolet light whose main emission wavelength falls within the wavelength band of 200 to 235 nm.

[0007] Irradiation with ultraviolet light, the main emission wavelength of which falls within the wavelength range of 200 to 235 nm, can effectively inactivate urease, thereby suppressing the production of ammonia and odor.

[0008] In this specification, the term "surface of an object on which urease remains" refers to a surface of an object on which urease exists and which may react with urea to generate ammonia.

[0009] In this specification, the term "main emission wavelength" refers to a wavelength λi in a wavelength range Z(λi) that exhibits an integrated intensity of 40% or more of the total integrated intensity in an emission spectrum, when a wavelength range Z(λ) of ±10 nm from a certain wavelength λ is defined on the emission spectrum.

[0010] In the odor suppression method according to the present invention, the cumulative irradiation amount of the ultraviolet light on the surface of the object is 50 mJ / cm ２ It is preferable that the above is set.

[0011] The cumulative irradiation dose of ultraviolet light is 50 mJ / cm ２ By doing so, the urease remaining on the surface of the object can be effectively deactivated.

[0012] In the odor suppression method according to the present invention, the integrated irradiation amount of the ultraviolet light on the surface of the object is 50 mJ / cm 2 after one week has elapsed since the start of irradiation with the ultraviolet light. ２ It is preferable to determine the ultraviolet light irradiation operation so as to satisfy the above.

[0013] From the viewpoint of suppressing odors early, it is preferable to irradiate a large amount of ultraviolet light in a short period of time. However, when considering the case where it is desired to limit the amount of irradiation to the human body to a predetermined standard or less, it is desirable to set the light intensity and lighting time so that the amount of ultraviolet light irradiation is low when people are present, or to control it so that it is not irradiated, and set the light intensity and lighting time so that more ultraviolet light is irradiated when people are absent. In this case, operation control can be performed based on the detection signal from the human detection unit. In this case, it is preferable to set the integrated irradiation amount of ultraviolet light to 50 mJ / cm in a short period of time when people are absent. ２ The operation may be performed to achieve the above.

[0014] In the odor suppression method according to the present invention, the integrated irradiation amount of the ultraviolet light on the surface of the object is 100 mJ / cm ２ It is preferable that the above is set.

[0015] The cumulative irradiation dose of ultraviolet light is 100 mJ / cm ２ By doing so, the urease remaining on the surface of the object can be more effectively deactivated.

[0016] In the odor suppression method according to the present invention, the surface of the object on which urease remains is formed in the space inside a toilet, and may be the inner surface of a toilet bowl. Because urea derived from urine is present on the inner surface of a toilet bowl placed in the space inside a toilet, the odor suppression method according to the present invention is useful.

[0017] Furthermore, in the odor suppression method according to the present invention, the surface of an object on which urease remains may be formed in the space within a toilet, and may be the surface around the toilet bowl. The odor suppression method according to the present invention is useful because urea derived from scattered urine is present on surfaces around the toilet bowl located in the space within a toilet, specifically on the surfaces of the floor and walls.

[0018] In the odor suppression method according to the present invention, the surface of an object on which urease remains may be formed in a bathroom space. The odor suppression method according to the present invention is useful because urea derived from urine and sweat, as well as urea contained in cosmetics, is present on the surfaces of objects placed in a bathroom, specifically the surfaces of the bathtub, floor, and walls.

[0019] In the odor suppression method according to the present invention, the surface of the object on which urease remains is formed in the space within a bathroom, and may be the inner surface of a washbowl. The odor suppression method according to the present invention is useful because urea derived from urine and sweat, as well as urea contained in cosmetics, is present on the inner surface of a washbowl placed in a bathroom.

[0020] In the odor suppression method according to the present invention, the surface of the object on which urease remains may be formed inside a waste treatment chamber, where urea derived from urine is present.

[0021] The odor suppression system of the present invention comprises a light source that irradiates ultraviolet light having a main emission wavelength in the wavelength band of 200 to 235 nm, the light source irradiates the ultraviolet light onto the surface of an object on which urease remains, and the light source is incorporated into the object that constitutes the surface of the object or in a location adjacent to the object.

[0022] Irradiation with ultraviolet light, the main emission wavelength of which falls within the wavelength range of 200 to 235 nm, can effectively inactivate urease, thereby suppressing the production of ammonia and odor.

[0023] In the odor control system according to the present invention, the object may be any one of a toilet, a unit bath, a washbasin, and a waste sink. Urea is present on the surfaces of toilets, unit baths, washbasins, and waste sinks, making the odor control system according to the present invention useful.

[0024] In the odor control system according to the present invention, the object may be a wall or a floor, and the light source may be embedded in the wall or floor. This configuration allows the ultraviolet light to be more effectively irradiated onto the surface of the object on which urease remains than when the light source is installed on, for example, a ceiling.

[0025] FIG. 1 is a diagram showing an example of a public restroom in which the odor suppression method and odor suppression system according to the present invention are expected to be implemented; FIG. 2 is a graph showing the light absorption characteristics of urease; FIG. 3 is a graph showing the deactivation characteristics of urease; FIG. 4 is a diagram showing a public restroom according to another embodiment;

[0026] An embodiment of an odor suppression method and an odor suppression system according to the present invention will be described with reference to the drawings. Note that the drawings are schematic illustrations, and the dimensional ratios in the drawings do not necessarily correspond to the actual dimensional ratios, and the dimensional ratios between the drawings do not necessarily correspond to the actual dimensional ratios.

[0027] 1 is a diagram showing a schematic diagram of an example of a public restroom in which the odor control method and odor control system according to the present invention are expected to be implemented. The odor control method and odor control system irradiates an object surface with ultraviolet light L from a light source 1.

[0028] A urinal 11, for example, is provided on the wall of the toilet 10. A gutter 12 is provided below the urinal 11. The upper part of the gutter 12 is covered with grating 13. A soiling stone 14 is attached to the floor below the urinal 11. Floor tiles 15 are attached to the floor of the toilet 10. A light source 1 is installed on the ceiling of the toilet 10.

[0029] The odor generated in toilets comes from feces or urine. In toilets in train stations, which are particularly crowded with people, ammonia produced from urine is often a problem. The mechanism by which ammonia is produced is as follows:

[0030] First, urea in urine is decomposed into ammonium ions by urease, a bacterial metabolite. The pH then rises as the concentration of ammonium ions increases. As p increases, for example, when the pH exceeds 7, the ammonium ions turn into ammonia, generating an odor.

[0031] Urease is produced by urease-producing bacteria. Examples of urease-producing bacteria include Pseudomonas aeruginosa, Proteus mirabilis, Proteus vulgaris, Morganella morganii, and Klebsiella pneumoniae and Klebsiella oxytoca. That is, by reducing the amounts of urease and urease-producing bacteria involved in ammonia production, the amount of ammonia produced can be suppressed. This can suppress the problem of ammonia odor in places that are not well cleaned, such as public restrooms.

[0032] Pseudomonas aeruginosa is a bacterium present in our everyday living environment. However, as described above, the urease produced by Pseudomonas aeruginosa reacts with urea to produce ammonia, which poses a problem. Places where residual urease can produce ammonia include toilets, bathrooms, washrooms, and waste treatment rooms in hospitals and other facilities. Potential sources of ammonia include urea derived primarily from urine in toilets, urea derived from urine and sweat or urea contained in cosmetics in bathrooms and washrooms, and urea derived primarily from urine in waste treatment rooms. Therefore, by inactivating urease remaining on the surfaces of objects located in spaces within toilets, bathrooms, washrooms, and waste treatment rooms, ammonia production can be suppressed.

[0033] If 1 unit of urease is defined as the amount of urease that produces 1 μmol of ammonium ions from urea in 1 minute at 25°C and pH 7, then, although this will vary depending on ventilation conditions, for example, in toilet 10, when 1,000 units or more of urease are present, an ammonia odor is likely to be perceived. The amount of urease remaining on the surface of an object can be measured, for example, using a commercially available urease activity measurement kit.

[0034] In the course of conducting research into odor suppression methods, the present inventors discovered that ultraviolet light whose main emission wavelength falls within the wavelength band of 200 to 235 nm is not only less harmful to the human body but also highly effective at inactivating urease. Furthermore, ultraviolet light whose main emission wavelength falls within the wavelength band of 200 to 235 nm also has the effect of sterilizing urease-producing bacteria. Therefore, the odor suppression method according to the present invention involves irradiating the surface of an object on which urease remains with ultraviolet light L whose main emission wavelength falls within the wavelength band of 200 to 235 nm. The odor suppression method preferably involves irradiating the surface of an object on which urease remains with ultraviolet light L whose main emission wavelength falls within the wavelength band of 200 to 230 nm.

[0035] FIG. 2 is a graph showing actual measurements of the light absorption characteristics of urease, showing the absorbance ratio when the absorbance at 254 nm, known as the bactericidal line, is set to "1." FIG. 3 is a graph showing the inactivation characteristics of urease. As shown in FIG. 2, urease has the property of absorbing light better at shorter wavelengths. It is known that the absorbance of proteins is particularly high at ultraviolet light in the wavelength range shorter than 240 nm, and it can be seen from FIG. 2 that the absorbance of urease, an enzyme, is also significantly high. It can also be seen that the absorbance of ultraviolet light at a wavelength of 240 nm is 1.2 times higher than that of 254 nm. Furthermore, it is shown that the absorbance is 1.3 times higher at a wavelength of 235 nm and 1.4 times higher at a wavelength of 230 nm.

[0036] Furthermore, as shown in Figure 3, it is clear that ultraviolet light having a main emission wavelength of 222 nm has an extremely high inactivation effect compared to ultraviolet light having a main emission wavelength of 254 nm. This is thought to be because urease absorbs light better at shorter wavelengths, with the absorbance ratio at the peak wavelength of 222 nm being 1.6 times higher, and furthermore, shorter wavelengths have higher photon energy, so that ultraviolet light of 222 nm has a significantly improved urease inactivation property compared to ultraviolet light of 254 nm.

[0037] It is known that ultraviolet light with a wavelength of less than 240 nm has little effect on the human body. From the viewpoint of further reducing the effect on the human body, it is more preferable that the main emission wavelength of the ultraviolet light L emitted from the light source 1 falls within the wavelength band of 200 to 235 nm, and even more preferable that the main emission wavelength falls within the wavelength band of 200 to 230 nm. This is also preferable from the viewpoint of more effectively inactivating residual urease.

[0038] As shown in FIG. 3, ultraviolet light with a main emission wavelength of 222 nm has an integrated irradiation dose of 30 mJ / cm ２ Approximately 87% of the urease was inactivated at an accumulated irradiation dose of 50 mJ / cm ２ Approximately 93% of the urease was inactivated at an accumulated irradiation dose of 100 mJ / cm ２ Approximately 100% of the urease is inactivated at this dose. Therefore, the cumulative dose of ultraviolet light is 30 mJ / cm ２ It is preferable to set the dose to 50 mJ / cm or more. ２ More preferably, it is 100 mJ / cm or more. ２ It is particularly preferable that the ultraviolet light having a main emission wavelength of 222 nm has an integrated irradiation dose of 5 mJ / cm. ２ It is possible to inactivate urease-producing bacteria at this level, thereby suppressing the new production of urease.

[0039] The odor suppression system of this embodiment includes a light source 1 that emits ultraviolet light L. The ultraviolet light L is emitted from the light source 1 toward an object surface on which urease remains. In the example of Figure 1, the object surface is formed in the space within a toilet 10, and is the inner surface of a urinal 11 or surfaces around the urinal 11 (surfaces of a gutter 12, grating 13, soiling stone 14, floor tiles 15, walls, etc.).

[0040] 1, the light source 1 is attached to the ceiling, but the light source 1 may be embedded in the ceiling or wall. If the light source 1 is embedded, at least the surface from which the ultraviolet light L is extracted may be covered with a material that is transparent to the ultraviolet light L.

[0041] The light source 1 is configured to emit ultraviolet light L having a main emission wavelength in the wavelength band of 200 to 235 nm. As an example, the light source 1 is configured as an excimer lamp. The excimer lamp has a discharge vessel in which a light-emitting gas is sealed. The light-emitting gas is made of a material that emits ultraviolet light L having a main emission wavelength of 190 to 240 nm during excimer emission. As an example, the light-emitting gas includes KrCl. When the light-emitting gas includes KrCl, the excimer lamp emits ultraviolet light L having a main peak wavelength of 222 nm or thereabouts.

[0042] In this specification, the term "main peak wavelength" refers to the wavelength at which the light intensity in the emission spectrum is at its maximum value. In addition, in this specification, the term "main emission wavelength" refers to the wavelength at which the light intensity in the emission spectrum is at least 50% of the light intensity at the main peak wavelength.

[0043] However, the light source 1 is not limited to a specific form as long as it emits ultraviolet light whose main emission wavelength falls within the wavelength band of 200 to 235 nm. That is, the light source 1 may be configured with a solid-state light source such as an LED or laser diode instead of an excimer lamp.

[0044] The odor control system includes a lighting control unit (not shown) that controls the operation of light source 1. The odor control system may also include a human detection unit (not shown) that detects the presence of a human body in toilet 10. The human detection unit may be, for example, an optical sensor or a camera.

[0045] As mentioned above, ultraviolet light whose main emission wavelength belongs to the wavelength band of 200 to 235 nm has a relatively high absorbance for urease compared with ultraviolet light of 254 nm, which is a sterilizing radiation, and it is expected that irradiating the surface of an object with ultraviolet light belonging to this wavelength band will promote the deactivation of urease. In this case, the cumulative irradiation dose of ultraviolet light L on the surface of the object is 50 mJ / cm after one week has elapsed since the start of irradiation with ultraviolet light L. ２ It is preferable to determine the irradiation operation of the ultraviolet light L so that the above is satisfied. Here, the irradiation operation of the ultraviolet light L refers to the illuminance and irradiation time of the ultraviolet light. For example, it is possible to adopt an effective irradiation operation based on the lighting operation cycle when a person is present, assuming that the daytime activity time is 8 hours. Specifically, the illuminance X [mW / cm] of the ultraviolet light irradiated onto the surface of the object is determined. ２ ], the ON duty ratio Y of the lighting operation cycle [lighting time / lighting period], and the activity time Z [28800 seconds] are multiplied to obtain the estimated daily irradiation amount [mJ / cm ２ ] is 7.2 mJ / cm ２ By performing the irradiation operation as described above, the radiation intensity was increased to 50 mJ / cm after one week. ２ The above can be achieved. In addition, for example, it is possible to adopt an effective irradiation operation assuming that the lighting operation cycle when no one is present is based on the assumption that the absence time is 5 hours, such as at night. Specifically, the illuminance X [mW / cm] of ultraviolet light irradiated onto the surface of an object can be calculated. ２ ], the ON duty ratio Y of the lighting operation cycle when the light is turned on when the light is off [lighting time / lighting cycle], and the estimated daily irradiation amount [mJ / cm 2] obtained by multiplying the ON duty ratio Y of the lighting operation cycle when the light is off [lighting time / lighting cycle] and the pause time Z [18,000 seconds]. ２ ] is 7.2 mJ / cm ２ By performing the irradiation operation as described above, the radiation intensity was increased to 50 mJ / cm after one week. ２ The above can be achieved. The desired irradiation dose is 100 mJ / cm ２If this is the case, the estimated daily exposure is 14.3 mJ / cm ２ By performing the above-described irradiation operation, an effective irradiation operation can be performed.

[0046] The cumulative irradiation dose of ultraviolet light L on the object surface was 50 mJ / cm 48 hours after the start of irradiation with ultraviolet light L. ２ It is more preferable to determine the irradiation operation of ultraviolet light L so that the above is achieved. From the viewpoint of not only deactivating urease but also suppressing the proliferation of urease-producing bacteria, it is desirable to irradiate a sufficient amount of ultraviolet light L within 48 hours. For example, it is possible to adopt an effective irradiation operation based on the lighting operation cycle when people are present, assuming that the daytime activity time is 8 hours. Specifically, the illuminance X [mW / cm] of ultraviolet light irradiated onto the surface of an object is ２ ], the ON duty ratio Y of the lighting operation cycle [lighting time / lighting period], and the activity time Z [28800 seconds] are multiplied to obtain the estimated daily irradiation amount [mJ / cm ２ ] is 25 mJ / cm ２ By performing the irradiation operation as described above, the irradiation efficiency was 50 mJ / cm after 48 hours. ２ The above can be achieved. In addition, for example, it is possible to adopt an effective irradiation operation assuming that the lighting operation cycle when no one is present is based on the assumption that the absence time is 5 hours, such as at night. Specifically, the illuminance X [mW / cm] of ultraviolet light irradiated onto the surface of an object can be calculated. ２ ], the ON duty ratio Y of the lighting operation cycle when the light is turned on when the light is off [lighting time / lighting cycle], and the estimated daily irradiation amount [mJ / cm 2] obtained by multiplying the ON duty ratio Y of the lighting operation cycle when the light is off [lighting time / lighting cycle] and the pause time Z [18,000 seconds]. ２ ] is 25 mJ / cm ２ By performing the irradiation operation as described above, the irradiation efficiency was 50 mJ / cm after 48 hours. ２ The above can be achieved. The desired irradiation dose is 100 mJ / cm ２ If this is the case, the expected daily exposure is 50 mJ / cm ２ By performing the above-described irradiation operation, an effective irradiation operation can be performed.

[0047] It is also desirable to inactivate urease in a shorter time, and the cumulative irradiation dose of ultraviolet light L on the object surface is 50 mJ / cm 24 hours after the start of irradiation with ultraviolet light L. ２ The irradiation operation of ultraviolet light L may be determined so that the above is achieved. This allows most of the produced urease to be inactivated within a day, and the perception of an unpleasant odor can be more effectively prevented. For example, an effective irradiation operation may be adopted based on the lighting operation cycle when people are present, assuming that the daytime activity time is 8 hours. Specifically, the illuminance X [mW / cm] of ultraviolet light irradiated onto the surface of an object is ２ ], the ON duty ratio Y of the lighting operation cycle [lighting time / lighting period], and the activity time Z [28800 seconds] are multiplied to obtain the estimated daily irradiation amount [mJ / cm ２ ] at 50 mJ / cm ２ The irradiation operation is as above. In addition, it is also possible to adopt an effective irradiation operation assuming that the lighting operation cycle when no one is present is based on the absence of people for 5 hours, such as at night. Specifically, the illuminance X [mW / cm] of ultraviolet light irradiated onto the surface of an object is ２ ], the ON duty ratio Y of the lighting operation cycle when the light is turned on when the light is off [lighting time / lighting cycle], and the estimated daily irradiation amount [mJ / cm 2] obtained by multiplying the ON duty ratio Y of the lighting operation cycle when the light is off [lighting time / lighting cycle] and the pause time Z [18,000 seconds]. ２ ] at 50 mJ / cm ２ The irradiation operation is performed so that the desired irradiation dose is 100 mJ / cm ２ If this is the case, the expected daily irradiation dose is 100 mJ / cm ２ The irradiation operation is set as described above.

[0048] Furthermore, the ultraviolet light L does not need to be continuously irradiated, but may be irradiated intermittently. Furthermore, the ultraviolet light L may be irradiated in a predetermined manner when no one is present, and the illuminance of the ultraviolet light L may be reduced when a person is present. Furthermore, when no one is present, the predetermined irradiation operation may be continued until the cumulative irradiation amount of the ultraviolet light L reaches a target value, and after the target value is reached, the light source 1 may be turned off.

[0049] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configurations should not be considered to be limited to these embodiments. The scope of the present invention is defined not only by the description of the above embodiments but also by the claims, and further includes all modifications within the meaning and scope of the claims.

[0050] The structures employed in the above-described embodiments can be employed in any other embodiment. The specific configurations of the components are not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention. Furthermore, one or more of the configurations, methods, etc. relating to the various modified examples described below may be arbitrarily selected and employed in the configurations, methods, etc. relating to the above-described embodiments.

[0051] In the above embodiment, a urinal 11 is provided in the toilet 10, but a toilet bowl may also be provided.

[0052] In the above embodiment, the light source 1 is attached to the ceiling, but is not limited to this. The light source 1 may also be embedded in the ceiling.

[0053] The light source 1 may also be incorporated in the urinal 11 or in a location adjacent to the urinal 11. For example, the light source 1 may be disposed on the bottom surface of the urinal 11, as shown in Fig. 4. This allows the ultraviolet light L to be effectively irradiated onto the surface of the gutter 12 or grating 13.

[0054] Also, for example, the light source 1 may be embedded in the floor as shown in Fig. 4. Here, the light source 1 is embedded in a stain dripping stone 14, but it may also be embedded in a floor tile 15. Also, although not shown, for example, the light source 1 may be embedded in a wall. Furthermore, although not shown, for example, the light source 1 may be embedded in a urinal 11. If the light source 1 is embedded, at least the surface from which the ultraviolet light L is extracted may be covered with a material that is transparent to the ultraviolet light L. At least one light source 1 is provided in the toilet 10.

[0055] In the above embodiment, a toilet 10 is shown as a location where the odor control method and odor control system are expected to be implemented, but this is not limited thereto. The odor control method and odor control system may be implemented in, for example, a bathroom, a washroom, a waste disposal room, etc. Examples of objects on which urease may remain include a unit bath (including a bathtub), a washbasin, and a waste sink.

[0056] 1: Light source 10: Toilet 11: Urinal 12: Gutter 13: Grating 14: Dirt stone 15: Floor tile L: Ultraviolet light

Claims

1. A method for suppressing odor, comprising irradiating the surface of an object on which urease remains with ultraviolet light having a main emission wavelength in the wavelength range of 200 to 235 nm.

2. The integrated irradiation dose of the ultraviolet light on the surface of the object is 50 mJ / cm ２ 2. The odor control method according to claim 1, wherein the odor control method comprises the steps of:

3. The integrated dose of the ultraviolet light on the surface of the object is 50 mJ / cm after one week has elapsed since the start of the ultraviolet light irradiation. ２ 3. The odor control method according to claim 2, wherein the ultraviolet light irradiation operation is determined so as to satisfy the above.

4. The integrated irradiation dose of the ultraviolet light on the surface of the object is 100 mJ / cm ２ 2. The odor control method according to claim 1, wherein the odor control method comprises the steps of:

5. The odor control method according to any one of claims 1 to 4, characterized in that the surface of the object on which urease remains is formed in the space within the toilet and is the inner surface of the toilet bowl.

6. The odor control method according to any one of claims 1 to 4, characterized in that the surface of the object on which urease remains is formed in the space within the toilet and is the surface around the toilet bowl.

7. A method for suppressing odors as described in any one of claims 1 to 4, characterized in that the surface of the object on which urease remains is formed in the space within a bathroom.

8. The odor control method according to any one of claims 1 to 4, characterized in that the surface of the object on which urease remains is formed in the space within the washroom and is the inner surface of the washbasin.

9. An odor control method as claimed in any one of claims 1 to 4, characterized in that the surface of the object on which urease remains is formed inside a waste treatment room.

10. An odor suppression system comprising a light source that irradiates ultraviolet light having a main emission wavelength in the wavelength band of 200 to 235 nm, the light source irradiates the ultraviolet light onto the surface of an object on which urease remains, and the light source is incorporated into the object that constitutes the surface of the object or in a location adjacent to the object.

11. The odor control system of claim 10, wherein the object is one of a toilet, a unit bath, a wash basin, and a waste sink.

12. The odor control system of claim 10, wherein the object is a wall or a floor, and the light source is embedded in the wall or floor.

Images