JPH0240986Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a deodorizing and sterilizing fluorescent lamp. More specifically, the present invention relates to a deodorizing and sterilizing fluorescent lamp having an indoor lighting function and a function of removing bad odors caused by oxidizable sulfur compounds in human waste treatment plants, sewage treatment plants, livestock farms, etc.

[Prior art] Offensive odors generated in human waste treatment plants, sewage treatment plants, livestock farms, etc. have become a social problem, and the main components of the offensive odors are nitrogen compounds such as ammonia, methylamine, and trimethylamine, and hydrogen sulfide. It is a sulfur-containing compound such as , methyl mercaptan, methyl sulfide, methyl disulfide, and carbon disulfide, and also contains small amounts of unsaturated hydrocarbons and unsaturated aldehydes. Among these, nitrogen compounds are basic and can be removed by methods such as acid washing, but sulfur compounds are difficult to remove.
Its odor is particularly strong, and it is known that even concentrations as low as 10 ppm or less can cause intense disgust.

Various techniques have been developed to remove bad odors generated in human waste treatment plants, sewage treatment plants, livestock farms, etc.
It is difficult to purify most of the above-mentioned malodorous components at a relatively low concentration to the extent that the malodor is not perceptible, and a device that efficiently and economically removes malodors has not yet been put into practical use.

[Problems to be solved by the invention] The present invention solves the above-mentioned problems and deodorizes oxygen-containing gases containing oxidizable sulfur compounds by effectively and economically. The purpose of the present invention is to provide a deodorizing and sterilizing fluorescent lamp capable of illuminating.

[Means for Solving the Problems] The deodorizing and sterilizing fluorescent lamp of the present invention includes an electric lamp that generates ultraviolet light whose inner surface is partially coated with a fluorescent agent, and a lamp that is not coated with a fluorescent agent. It is composed of a single or mixed metal oxide layer of titanium oxide or zinc oxide provided at a portion that is irradiated with ultraviolet rays emitted from the portion.

As the titanium oxide to be used, anatase type is particularly preferred as it has high activity. Further, titanium oxide may be mixed with an alkali metal or alkaline earth metal oxide or hydroxide, or may be in the form of a composite metal oxide such as potassium tetratitanate or potassium hexatitanate. . Furthermore, an adsorbent such as activated carbon or oxidized clay may be used in combination.

The wavelength of the irradiated ultraviolet light is 400 to 200 nm.
Near ultraviolet rays of 200 nm or less are preferable, but vacuum ultraviolet rays of 200 nm or less may also be included. These ultraviolet rays can be generated by using ultra-high pressure mercury lamps, xenon lamps, and low-pressure mercury lamps alone or in combination.
For indoor irradiation it is preferable to use a low pressure mercury lamp.

The metal oxide used in the present invention can be applied to the surface of the part of the lamp that is not coated with the fluorescent agent or to the reflective plate around the lamp. It is also possible to provide a support around the lamp and impregnate or coat it with the metal oxide.

The amount of metal oxide used varies depending on the composition and concentration of the oxidizable sulfur compound, the type of light source, and the amount of power used, but is not particularly limited. Also, the concentration of oxidizable sulfur compounds in the gas to be treated is 0.1~
It can be treated in a range of 10,000 ppm, but is not essentially limited.

[Effect] The present inventors have been conducting research on excitation chemistry using ultraviolet rays for some time, and as a development of that basic research, they have discovered that titanium oxide or zinc oxide, alone or as a mixed metal oxide, coexists with oxidizable sulfur compounds. In such cases, the present invention was completed by discovering that the decomposition reaction of oxidizable sulfur compounds can occur efficiently by irradiation with near-ultraviolet light having a wavelength of 200 nm or more.

The principle of action of titanium oxide or zinc oxide alone or mixed metal oxide in this invention is currently under detailed research, but electrons in the valence band in n-type semiconductors such as titanium oxide and zinc oxide absorb ultraviolet rays. The hole generated in the valence band oxidizes the surface hydroxyl group of the oxidizable sulfur compound to generate OH radical, and this OH radical oxidizes the oxidizable sulfur compound. It is presumed that it is easily converted into sulfur dioxide, sulfuric acid anhydride, carbon dioxide, water, etc.

Therefore, when the deodorizing and sterilizing fluorescent lamp of the present invention is turned on to irradiate ultraviolet rays in a gas to be treated containing oxidizable sulfur compounds and oxygen, the oxidizable sulfur compounds in the gas to be treated are converted into sulfur dioxide, sulfur dioxide, Easily decomposed into sulfuric anhydride, carbon monoxide, water, etc.

In addition, in the deodorizing and sterilizing fluorescent lamp of the present invention, the fluorescent agent excited by the emitted ultraviolet rays emits visible light, which can illuminate the interior at the same time.

Note that the obtained decomposition product does not need to be particularly removed if it is in a minute concentration. Also,
If the concentration is high, it can be easily removed by conventional methods such as washing with a neutral or alkaline aqueous solution or adsorption with a basic solid.

A particular feature of the present invention is that it can effectively oxidize and decompose sulfur compounds at extremely low concentrations of 1 ppm or less, and this is the basis for removing bad odors.

[Example] Next, the deodorizing and sterilizing fluorescent lamp of the present invention will be explained with reference to the drawings. Fig. 1 is a conceptual diagram of an embodiment of the deodorizing and sterilizing fluorescent lamp of the present invention.

In FIG. 1, 1 is a low-pressure mercury lamp, 2 is a fluorescent agent such as ZnO applied to the lower half of the inner surface of the low-pressure mercury lamp 1, and 3 is a fluorescent agent applied to the upper half of the surface of the low-pressure mercury lamp 1. 4 is a ventilation pipe, and 5 is a partition plate such as a ceiling plate or a wall.

The low-pressure mercury lamp 1 of this embodiment is supported by a partition plate 5, and is mounted so that its lower half circumference is exposed indoors, and its upper half circumference is exposed inside the ventilation pipe 4. Further, the fluorescent agent 2 and the metal oxide layer 3 are coated separately on a lower half circumference and an upper half circumference, respectively. Reference numeral 6 denotes a fan, which forces gas containing oxidizable sulfur compounds into the vent pipe 4.

The present embodiment configured in this manner is installed on the roof or wall of a human waste treatment plant, sewage treatment plant, livestock farm, etc., and is designed to supply gas containing oxidizable sulfur compounds with an odor. used. When low-pressure mercury lamp 1 is turned on, low-pressure mercury lamp 1
Visible light is emitted from the surface coated with the fluorescent agent 2 to illuminate indoor spaces. On the other hand, inside the ventilation pipe 4, a gas containing an oxidizable sulfur compound comes into contact with the metal oxide layer 3 under an environment where ultraviolet rays are irradiated, thereby producing a deodorizing and sterilizing effect.

Note that in this specification, the gas containing an oxidizable sulfur compound and oxygen refers to a gas containing an oxidizable sulfur compound and oxygen.
It refers to a gas mixture containing 0.1 ppm or more and about 1% or more of oxygen, such as fermentation gas, foul-smelling air from human waste treatment plants, sewage treatment plants, and livestock farms. In addition, it may further contain ammonia, nitrogen-containing hydrocarbons such as methylamine, dimethylamine, and trimethylamine, unsaturated hydrocarbons, alcohols, aldehydes, and the like.

In addition, the oxidizable sulfur compound in this specification means a sulfur compound that can react with oxygen, such as sulfur-containing hydrocarbons such as methyl mercaptan, methyl sulfide, methyl disulfide, and carbon disulfide, and hydrogen sulfide. can be given.

Generally, even if an oxygen gas such as air containing sulfur compounds is irradiated with near-ultraviolet light with a wavelength of 200 nm or more, almost no oxidative decomposition reaction occurs because these components do not absorb light. However, surprisingly, when the deodorizing and sterilizing fluorescent lamp of the present invention is used to irradiate ultraviolet rays in the presence of metal oxide 3, an oxidative decomposition reaction of the oxidizable sulfur compounds occurs, and the bad odors caused by them are removed. It is possible.

The irradiation time of ultraviolet rays varies depending on the type of ultraviolet rays, the type and concentration of oxidizable sulfur compounds, the composition of the gas mixture to be treated, etc., and can be selected appropriately according to these conditions, but it is usually 10 seconds to 30 minutes. Just irradiate it. Alternatively, continuous irradiation may be performed.

When adjusting the deodorizing treatment time according to the odor concentration, it is preferable to control the driving time of the fan 6 using an appropriate timer. The drive time and stop time set by the timer may be set by manual input means, but an automatic control device using a microcomputer or the like may also be used. In the case of using an automatic control device such as the latter, it is preferable to detect the odor concentration using an odor sensor and to perform continuous drive or intermittent drive at appropriate intervals depending on the concentration.

Furthermore, in each of the embodiments described above, an aromatic agent may be provided on the outlet side of the ventilation pipe 4. In such cases, fragrance is added to the deodorized clean air, creating a more comfortable environment.

Further, when a normal deodorizing agent is provided on the outlet side of the ventilation pipe 4, residual odors that could not be removed by the deodorizing device are deodorized by the deodorizing agent, thereby making it possible to obtain cleaner air.

In each of the above-described embodiments, the metal oxide 3 is arranged around the lamp, but a structure in which the metal oxide 3 is applied directly to the outer periphery of the lamp may also be adopted.
In this case, the coating thickness of the metal oxide 3 needs to be such that ultraviolet rays can be transmitted through it.

[Effects of the invention] The deodorizing and sterilizing fluorescent lamp of this invention can be used not only for deep ultraviolet rays with wavelengths of 200 nm or less, but also for 200 nm wavelengths, which have extremely high power efficiency and are highly economical, but cannot oxidize and decompose oxidizable sulfur compounds. By effectively utilizing near ultraviolet rays with wavelengths exceeding sulfur compounds can be removed.

In addition, this invention can be used for factory exhaust where the odor of oxidizable sulfur compounds is a problem, and can also deodorize the interior of automobiles, refrigerators, toilets, etc., so this invention is extremely significant in terms of environmental hygiene. It is something that has.

Furthermore, indoor lighting can be done at the same time, so it has high practical value.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of an embodiment of the deodorizing and sterilizing fluorescent lamp of the present invention. Main symbols in the drawing: 1: low-pressure mercury lamp, 2: fluorescent agent, 3: metal oxide layer, 4: vent pipe.

Claims (1)

[Scope of utility model registration request] Electric lamps that emit ultraviolet light whose inner surfaces are partially coated with fluorescent agents, and titanium oxide or zinc oxide provided in areas that are irradiated with ultraviolet rays emitted from parts of the electric lamps that are not coated with fluorescent agents. A deodorizing and sterilizing fluorescent lamp consisting of a single or mixed metal oxide layer.