Description of the Related Art In general, a mobile simple toilet is installed in a public place, such as a sightseeing resort, a camping area, a parking lot, a park, an outdoor rest area, or a disaster area. Such a mobile simple toilet is conveniently moved and installed in a place, where persons are irregularly and temporarily concentrated, thereby having been increasingly installed.

The conventional mobile simple toilet comprises a storage tank for storing sewage under a toilet bowl. When the storage tank is filled with a designated amount of the sewage, the sewage is taken out of the storage tank by a collection vehicle, and the collected sewage is transferred to a sewage treatment plant or a sewage landfill and is then disposed.

The above conventional mobile toilet induces inhabitation of flies causing various diseases as well as generates offensive odors due to the sewage stored in the storage tank, thus having poor sanitation. Further, it is difficult to dispose of the sewage stored in the storage tank in an area, which the collection vehicle cannot reach.

Moreover, the sewage taken out of the storage tank must undergo a secondary treatment, thereby increasing economic burden.

In order to solve the above problems, various techniques for disposing of a sewage in a mobile toilet have been developed.

The present inventor filed an apparatus for disposing of sewage of a mobile toilet by vacuum drying and incinerating the sewage as Korean Patent Application No. 2003-48332 in the Korean Intellectual Property Office. In the technique disclosed by the above Patent, a toilet bowl of the mobile toilet is converted into a wash-down type bowl, the sewage stored in a storage tank is periodically incinerated, and the inside of the toilet is deodorized so that the sanitation of the toilet is highly improved.

Hereinafter, with reference to the accompanying drawings, the technique of Korean Patent Application No. 2003- 48332 filed by the present inventor will be described in detail.

FIG. 1 is a schematic perspective view of the conventional mobile toilet, and FIG. 2 is a schematic view illustrating a sewage treatment apparatus of the conventional mobile toilet. As shown in FIGS. 1 and 2, the conventional mobile toilet 100 comprises a sensor 112 for sensing whether or not a person is present therein, a toilet bowl 110, and the sewage treatment apparatus installed under the toilet bowl 110.

The sewage treatment apparatus includes the toilet bowl 110 including a switching lever 111, a sensor 121 for storing sewage transferred by the operation of the switching lever 111 and checking the amount of the stored sewage, a storage tank 120 including an underwater pump 122 driven by the sensor 121 for discharging a designated amount of the sewage, a recovery tank 125 for supplying washing water by the operation of a pump 126, when the switching lever 111 is returned to its original position, and collecting the remaining amount of the washing water by filtering the washing water except for a small amount of the washing water, a vacuum furnace 130 including an electromagnetic wave generator 131 and a heater 132 installed at the lower portion thereof for drying and incinerating the sewage supplied from the storage tank 120, an agitator 134 driven by a motor 133 installed on the vacuum furnace 130, and a ball mill 135 for grinding the dried sewage, and a strainer

140 for filtering polluted water obtained by injecting water to ash in the vacuum furnace 130 and by agitating the mixture.

When the sensor 112 senses that a person is present in the mobile toilet having the above sewage treatment apparatus, a fan 113 is driven so that offensive odors in the toilet are treated and eliminated by an agglomerator 162 and a deodorizer 170. Sewage in the toilet bowl 110 is transferred to the storage tank 120 by the switching lever 111, and, when the storage tank 120 is filled with the sewage, the underwater pump 122 is driven by the sensor 121 so that a designated amount of the sewage is transferred to the vacuum furnace 130.

Moisture and offensive odors of the sewage transferred to the vacuum furnace 130 are inhaled by a vacuum pump 160, and pass through a cooler 161. The cooled water is transferred to the recovery tank 125, and the offensive odors are discharged to the outside through the deodorizer 170. The sewage dried by the vacuum furnace 130 is ground by the ball mill 135, and is then incinerated by the operation of the heater 132. The ash obtained by incineration is mixed with water introduced from the recovery tank 125, thereby producing polluted water. The polluted water is transferred to and filtered by the strainer 140, and the filtered clean water is transferred again to the recovery tank 125.

The sewage treatment apparatus disposes of the sewage of the mobile toilet and eliminates the offensive odors of the mobile toilet by the above-described procedure, thus highly improving the sanitation of the toilet. Further, the sewage treatment apparatus reuses the washing water and the moisture of the sewage, thereby being capable of reducing the consumption rate of water. Particularly, the sewage treatment apparatus efficiently disposes of sewage causing a source for generating environmental contamination, thereby highly contributing to environmental purification.

However, when the polluted water containing the ash obtained by the incineration of the sewage is filtered by the strainer 140, slurry remains after filtering. The slurry must be dried and post-treated, thereby complicating the sewage treatment procedure and requiring additional steps.

Further, the moisture of the sewage inhaled from the vacuum furnace 130 by the vacuum pump 160 passes through the cooler 161, and is then transferred to the recovery tank 125 without any additional purification treatment, thus deteriorating the sanitation of the toilet.

SUMMARY OF THE INVENTION Therefore, the present invention has been made in view of the above problems, and it is an object of the present

invention to provide a sewage treatment apparatus of a mobile toilet, which easily disposes of ash, obtained by incinerating sewage in a vacuum furnace, by a simple process.

Another object of the present invention is to provide a sewage treatment apparatus of a mobile toilet, which efficiently eliminates moisture and offensive odors of sewage, inhaled from a vacuum furnace, by a vacuum pump.

Yet another object of the present invention is to provide a sewage treatment method for efficiently driving the sewage treatment apparatus.

In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a sewage treatment apparatus of a mobile toilet, in which a vacuum furnace dries and incinerates sewage, and transfers the sewage to a bug filter through air of a high pressure so that large particles of the obtained ash are filtered out and small particles of the ash are captured by a cyclone and stored in a collection tub.

The sewage treatment apparatus effectively disposes of the ash by a simple procedure compared to a conventional sewage wet treatment apparatus of a mobile toilet.

Further, in the sewage treatment apparatus, moisture of the sewage inhaled from the vacuum furnace by a vacuum pump is cooled by first and second coolers, the water

obtained by cooling is introduced into a drain tank and passes through a reverse osmosis separation film (RO system) so that the purified water is transferred to a recovery tank and the non-purified water is introduced again to the drain tank, and offensive odors inhaled from the vacuum furnace by the vacuum pump pass through the first and second coolers and are purified by a deodorizer.

The sewage treatment apparatus effectively disposes of the moisture and offensive odors of the sewage inhaled from the vacuum furnace, and particularly uses the purified water to clean a toilet bowl or discharges the purified water to the outside.

In accordance with another aspect of the present invention, there is provided a sewage treatment method comprising transferring sewage in an amount of 10 liters from a storage tank to a vacuum furnace; vacuum drying and grinding the sewage, and incinerating the sewage at a temperature of 550-600 C for 1-2 hours; spraying air of a high pressure of 5-7kg/cuf stored in an air tank so that the obtained ash is captured and disposed by a bug filter and a cyclone.

The sewage treatment method efficiently disposes of the sewage stored in the storage tank in the mobile toilet.

Since a vacuum furnace dries and incinerates sewage, and air of a high temperature is sprayed thereinto so that the

obtained ash is disposed by a bug filter and a cyclone, a sewage treatment apparatus of a mobile toilet in accordance with the present invention effectively disposes of the ash by a simple process compared to a conventional sewage wet treatment apparatus of a mobile toilet.

The sewage treatment apparatus of the present invention allows moisture inhaled from a vacuum furnace through a vacuum pump to be cleanly purified by a drain tank and a reverse osmosis separation film, and allows inhaled offensive odors to be treated by a deodorizer and discharged to the outside, thereby effectively disposing of the offensive odors.

Further, since sewage stored in a storage tank is transferred to a vacuum furnace and is dried, ground, and incinerated, and is then treated by air of a high temperature, a sewage treatment method of a mobile toilet in accordance with the present invention increases disposal efficiency of the sewage.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. 1 is a schematic perspective view of a

conventional mobile toilet; FIG. 2 is a schematic view illustrating a sewage treatment apparatus of the conventional mobile toilet; FIG. 3 is a schematic view illustrating a sewage treatment apparatus of a mobile toilet in accordance with one embodiment of the present invention; and FIG. 4 is a schematic view illustrating a sewage treatment apparatus of a mobile toilet in accordance with another embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a schematic view illustrating a sewage treatment apparatus of a mobile toilet in accordance with one embodiment of the present invention.

As shown in FIG. 3, the sewage treatment apparatus in accordance with one embodiment of the present invention comprises a toilet bowl 10 provided with a switching lever 11, a sensor 21 for storing sewage transferred from the toilet bowl 10 by the operation of the switching lever 11 and sensing the amount of the stored sewage, a storage tank 20 including an underwater pump 22 for discharging a

designated amount of the sewage when the storage tank 20 is filled with the amount of the sewage, a pump 26 for supplying washing water to the toilet bowl 10 when the switching lever 11 is returned to its original position, a recovery tank 25 for filtering and storing the remaining amount of the washing water except for a part of the washing water supplied to the toilet bowl 10, a vacuum furnace 30 including an electromagnetic wave generator 31 and a heater 32 installed at the lower portion thereof for drying and incinerating the sewage supplied from the storage tank 20, an agitator 34 driven by a motor 33 installed on the vacuum furnace 30, and a ball mill 35 installed in the vacuum furnace 30 for grinding dried sewage, an air tank 40 for injecting a strong current of air through a plurality of nozzles 42 to discharge ash in the vacuum chamber 30 together with the air, a bug filter 50 for filtering the ash discharged together with the air, a collection tub 52 for storing the ash captured by the bug filter 50, a vacuum pump 60 for inhaling moisture and offensive odors of the sewage introduced into the vacuum furnace 30, first and second coolers 61 and 62 for cooling the moisture and offensive odors inhaled into the vacuum pump 60, a reverse osmosis separation film 90 for transferring the purified water to the recovery tank 25 and repeatedly passing the non-purified water by passing the cooled water obtained from the second

cooler 62, and a deodorizer 70 for discharging gas, obtained by eliminating the offensive odors passed through the second cooler 62, to the outside.

The sewage in the toilet bowl 10 is transferred to the storage tank 20 by the operation of the switching lever 11 installed at the toilet bowl 10. When the storage tank 20 is filled with a designated amount of the sewage, the sensor 21 senses the above state and operates the underwater pump 22 so that the designated amount of the sewage is transferred to the vacuum furnace 30.

When the sewage is transferred to the vacuum furnace 30, the moisture and offensive odors contained in the sewage are firstly transferred through the vacuum pump 60 by the operation of the vacuum pump 60 and the operation of the electromagnetic wave generator 31. The dried sewage is ground by the ball mill 35, and is incinerated by the heater 32. After the incineration of the dried sewage is completed, air of a high pressure stored in the air tank 40 is injected into the vacuum furnace 30 through a plurality of the nozzles 42. The air, which was injected into the vacuum pump 30, is transferred together with the ash to the bug filter 50. The ash is filtered by the bug filter 50, and is then stored in the collection tub 52. Here, the sewage treatment apparatus in accordance with this embodiment further comprises a cyclone 51 for capturing small particles of the

ash passed through the bug filter 50. The small particles of ash captured by the cyclone 51 are transferred together with the ash in the bug filter 50 to the collection tub 52. Then, the collection tub 52 stores the ash.

By injecting air into the ash in the vacuum furnace 30 obtained by incinerating and by allowing the ash to be captured by the bug filter 50 and the cyclone 51, the sewage treatment apparatus of this embodiment of the present invention simply and efficiently disposes of the ash, compared to a conventional wet sewage treatment apparatus of a mobile toilet. Here, the bug filter 50 uses a general filter, which is used for treating combustion gas and comparatively large particles of the ash.

In accordance with the present invention, the nozzles 42 for injecting the air of the air tank 40 to the vacuum furnace 30 are installed such that the nozzles 42 spray air in the normal direction of the vacuum furnace 30. In the case that the nozzles 42 having the above configuration are installed, when the nozzles 42 spray the air of a high pressure to the inside of the vacuum furnace 30, the eddy of the air is generated, thereby causing the ash to be more efficiently transferred to the bug filter 50 through the air. If necessary, the number of the nozzles 42 may be plural. Preferably, the number of the nozzles 42 is two to four.

The moisture and offensive odors of the sewage introduced into the vacuum furnace 30 are inhaled into the vacuum pump 60, and pass through the first cooler 61 and the second cooler 62. The water cooled by the second cooler 62 passes through the reverse osmosis separation film 90. Here, the purified water is transferred to the recovery tank 25, and the non-purified water is repeatedly circulated in the reverse osmosis separation film 90. The offensive odors passed through the second cooler 62 are purified by the deodorizer 70, and the purified gas is discharged to the outside. The deodorizer 70 may employ an active carbon deodorizer, a photo-catalytic deodorizer, or a combination thereof. After the use of the reverse osmosis separation film 90 is completed, the reverse osmosis separation film 90 is periodically recycled or replaced. Since the sewage treatment apparatus of the present invention is configured such that when the storage tank is filled with a designated amount of the sewage, the sewage is disposed, it is possible to replace the reverse osmosis separation film with a new one under the condition that the incineration of the sewage is not achieved. The replacement and the replacing time of the reverse osmosis separation film are freely selected, if necessary.

FIG. 4 is a schematic view illustrating a sewage treatment apparatus of a mobile toilet in accordance with

another embodiment of the present invention.

As shown in FIG. 4, the sewage treatment apparatus in accordance with another embodiment of the present invention further comprises a drain tank 80 for receiving the cooled water obtained by causing the water in the vacuum furnace 30, inhaled through the vacuum pump 60, to pass through the first and second coolers 61 and 62, transferring the purified water, obtained by causing the received cooled water to pass through the reverse osmosis separation film 90, to the recovery tank 25, and again receiving the non- purified water.

The sewage treatment apparatus having the above- described configuration effectively disposes of the moisture and offensive odors inhaled from the vacuum furnace 30, and particularly uses the purified water to wash the toilet bowl 10 or as a cleaning function.

Hereinafter, with reference to FIGS. 3 and 4, the operation of a sewage treatment apparatus of a mobile toilet and the procedure of a sewage treatment method in accordance with the present invention will be described in detail.

When a person enters the mobile toilet, the sensor 12 senses that the person is present in the mobile toilet, and operates the fan 13, thereby eliminating offensive odors.

Then, when the person operates the switching lever 11 installed at the toilet bowl 10 after the person had a

stool, water stored in the toilet bowl 10 and sewage are transferred to the storage tank 20. Here, when the switching lever 11 is returned to its original position, the water stored in the recovery tank 25 is supplied to the toilet bowl 10 by the operation of the pump 26 to wash the toilet bowl 10. In this process, a small amount (approximately 300cc) of the washing water remains in the toilet bowl 10 to prepare the use in the next time, and the residual amount of the washing water is introduced into the recovery tank 25.

When the washing water is introduced into the recovery tank 25, preferably, the washing water is firstly filtered through a porous ceramic ball (not shown) and a non-woven fabric (not shown), and is then secondarily filtered through a filtration tub (not shown) including a multistage filter, thereby being purified to be reused.

When the sewage fills a designated level of the storage tank 20, the underwater pump 22 is driven by the sensor 21 so that approximately 10 liters of the sewage is transferred to the vacuum furnace 30. Moisture and offensive odors are discharged from the sewage transferred to the vacuum furnace 30 by the operations of the electromagnetic wave generator 31 and the vacuum pump 60, thereby drying the sewage. The dried sewage is ground by the ball mill 35 in the vacuum furnace 30 and incinerated by the heater 32.

Preferably, the incineration of the dried sewage is

performed at a temperature of 550~600 C for 1-2 hours.

After the incineration of the dried sewage is completed, air of a high pressure stored in the air tank 40 is sprayed to the inside of the vacuum furnace 30 through a plurality of the nozzles 42, and is then transferred to the bug filter 50. Here, the ash in the vacuum furnace 30 is transferred together with the air to the bug filter 50. In order to effectively discharge the ash, the air of a high pressure of 5-7kg/cufis sprayed in the tangential direction in the vacuum furnace 30 so that the eddy of the air is generated. The air tank 40 is connected to a compressor 41 so that air compressed to a high pressure is stored in the air tank 20 at any time. The ash discharged together with the air is filtered by the bug filter 50, and the ash passed through the bug filter 50 is captured by the cyclone 51. The ash captured by the bug filter 50 and small particles of the ash captured by the cyclone 51 are stored in the collection tub 52. The ash in the collection tub 52 is a nonpolluted carbide, thus being used as an agent for treating water or improving the quality of soil. Accordingly, when a designated amount of the ash is gathered in the collection tub 52, the ash is collected and used for additional purposes.

The moisture and offensive odors of the sewage introduced into the vacuum furnace 30 are inhaled by the

operation of the vacuum pump 60, and pass through the first cooler 61 and the second cooler 62. The water cooled through the second cooler 62 is introduced into the drain tank 80, and the water introduced into the drain tank 80 passes through the reverse osmosis separation film 90 so that the purified water is transferred to the recovery tank 25 and the non-purified water is transferred again to the drain tank 80. The water purified by the above procedure is clean, thus being used as water for washing hands as well as for washing cleaning tools. The offensive odors passed through the second cooler 62 are purified through the deodorizer 70, and the obtained purified gas is discharged to the outside.

By disposing of the sewage of the mobile toilet by the above procedure, persons using the toilet can relieve themselves without catching offensive odors. Particularly, since the disposal of the sewage is achieved by a simple process, it is possible to effectively dispose of the sewage of the mobile toilet.

As apparent from the above description, the present invention provides a sewage treatment apparatus of a mobile toilet, in which a vacuum furnace dries and incinerates sewage, and air of a high temperature is sprayed thereinto so that the obtained ash is disposed by a bug filter and a cyclone, thereby effectively disposing of the ash by a simple process compared to a conventional sewage wet treatment

apparatus of a mobile toilet.

The sewage treatment apparatus of the present invention allows moisture inhaled from a vacuum furnace through a vacuum pump to be cleanly purified by a drain tank and a reverse osmosis separation film, and allows inhaled offensive odors to be treated by a deodorizer and discharged to the outside, thereby effectively disposing of the offensive odors.

Further, the present invention provides a sewage treatment method of a mobile toilet, in which sewage stored in a storage tank is transferred to a vacuum furnace and is dried, ground, and incinerated, and is then treated by air of a high temperature, thereby increasing disposal efficiency of the sewage.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.