JP3952768B2 - Final disposal method of treated water - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a final disposal method for treated water , and more particularly, to a final disposal method for treated water that is disposed by evaporating and drying treated water discharged from a water treatment facility .
[0002]
[Prior art]
The final disposal site used for landfill disposal of waste usually has a water-impervious construction on the bottom and side walls that are connected to its four sides, forming a concave container-shaped waste container with an open top. Waste is landfilled sequentially from the upper side of the housing part.
[0003]
Then, when a predetermined amount of waste is buried in the container, a final cover is provided on the upper part to complete the disposal of the waste, and the leachate generated from the waste is the water installed adjacent to the disposal site. The prescribed wastewater treatment was performed at the treatment facility, and the treated leachate after being treated at the water treatment facility was discharged as it was into a public water area.
[0004]
However, such a final disposal method has the following problems.
[0005]
[Problems to be solved by the invention]
First, leachate treated water from landfills where incinerated ash is landfilled contains chloride ions that are generated during the incineration process. If these ions are released without removing them, salt damage to crops, etc. will occur. Is concerned.
[0006]
For this reason, it is possible to remove the chloride ions from the leachate treated water using membrane treatment and heat dehydration treatment adopted in salt mills, etc., and then discharge the leachate treated water to the public water area. In such a method, although salt damage can be prevented, high power and enormous thermal energy are required to remove chloride ions, so that the cost required for disposal of treated leachate is high .
[0007]
The present invention solves the above technical problem, and by treating the leachate treated water by evaporating and drying it without discharging it into a public water area, etc., agricultural products that use the public water area are leached. It is intended to provide a final disposal method for treated water that can prevent salt damage caused by chloride ions contained in the treated water, and further reduce the disposal cost of the leachate treated water .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a final disposal method of treated water according to claim 1 of the present invention is a treatment of leachate discharged from a waste disposal site at a water treatment facility, and a treatment discharged from the water treatment facility. A final disposal method of treated water for evaporating water in an evaporation facility, wherein the evaporation facility is formed of a transparent glass roof on at least the south surface side of the roof portion, an intake window portion is provided on one side portion, and the other side portion. And a building that is provided with an exhaust window, a fan that is provided in the intake window and that blows air from the intake window toward the exhaust window, and is installed inside the building, A shallow-bottomed evaporation tank that temporarily stores treated water supplied from the water treatment facility, and a replaceable laying on the bottom surface of the evaporation tank, and the solid content of the treated water after evaporation of water Bei a filter mat which is colored black to adsorb The fan is driven to blow air from the intake window toward the exhaust window, and the treated water stored in the evaporation tank is brought into gas-liquid contact to evaporate the treated water. It is characterized by making it.
According to the final disposal method of treated water according to the present invention, the treated water stored in the evaporation tank is brought into gas-liquid contact by driving a fan to evaporate only the moisture of the treated water, whereby the solid content after moisture evaporation is black. It can be adsorbed on the filter mat colored . In addition, the solid matter adsorbed on the filter mat colored black can be removed by removing the filter mat together with the solid content and replacing the filter mat with a new one, thereby eliminating the trouble of removing the solid content (salt content). it can.
In addition, since heat absorption can be imparted to the filter mat, the moisture of the treated water can be efficiently evaporated.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a final disposal facility to which the method of the present invention is applied.
[0013]
In the figure, in the building 2 of the disposal facility 1, a shallow container-like evaporation tank 3 is installed, and the treated water supplied from the water treatment facility 4 is temporarily stored in the evaporation tank 3. Further, at least the south surface side of the roof portion is a transparent glass roof 5 through which sunlight passes, and sunlight is taken into the evaporating tank 3, and the treated water temporarily stored in the evaporating tank 3 is sequentially evaporated by the heat of this. I am letting. In addition, windows 6 are opened on both the north and south sides of the building 2. The south side window 6 is for intake and is equipped with a blower fan 7, and air is constantly blown from the south side window 6 toward the north side window 6 for exhaust to sequentially remove the evaporated water. .
[0014]
The bottom surface of the evaporation tank 3 is composed of an iron plate 8 subjected to rust prevention treatment, and a nichrome wire heater 9 for auxiliary heating is disposed on the lower surface of the iron plate 8. Further, on the upper surface of the iron plate 8, a filter mat 10 colored in black so as to easily absorb sunlight, such as an asphalt sheet, is laid in an exchangeable manner. The mat 10 adsorbs the solid content after moisture evaporation, and when the evaporation residue is accumulated to some extent, the entire residue is removed and replaced with a new mat 10 so that the labor of salt removal can be omitted. . The removed mat 10 is disposed of by incineration, and the evaporation residue collected on the mat 10 is collected and disposed of appropriately.
[0015]
Further, in the site of the disposal facility 1, one or a plurality of solar battery panels 11 and wind power generators 12 serving as solar power generators are provided, and the electric power obtained thereby is supplied to the heater 9 and the switch 9 via the switch 14. Connected to fan 7.
[0016]
The switch 14 is also connected to a general commercial power supply 15, and it takes in electricity from the commercial power supply 15 side according to the amount of power generated by the solar cell panel 11 and the wind power generator 12 (power purchase), or the commercial power supply 15 side. It is possible to switch to supply surplus power to (power sale). That is, the switch 14 determines the necessary power for driving the fan 7 and the heater 9, and if the power is insufficient from the determined value, the switch 14 is inserted, and if the power is sufficient, the commercial power supply 15 is cut. If surplus power is generated, control is performed to send the power to the commercial power supply 15 side.
[0017]
In addition to the above effects, the commercial power source 15 exclusively uses inexpensive nighttime power, and exclusively uses its own power obtained by the solar panel 11 and the wind power generator 12 during the daytime when sunlight is emitted. By doing so, it is possible to perform the evaporation process without day and night. Further, heat obtained by nighttime electric power may be accumulated in a hot water tank and used as a heat medium for heating the evaporation tank 3.
[0018]
In the above configuration, a certain amount of treated water treated in the water treatment facility 4 is stored in the evaporating tank 3, and moisture is removed by heating by circulation of solar heat, auxiliary heater 9, or hot water, and evaporated water. Are sequentially discharged out of the building 2 by the fan 7. After a certain period of time, the water is completely evaporated and only the salt content is deposited on the surface of the mat 10.
[0019]
When automating the above operation, evaporation is detected by a moisture meter or the like, and when this measured value becomes a set value, the control for supplying a fixed amount of treated water from the water treatment facility 4 is repeated again. That's fine. Moreover, although the above evaporative drying treatment must be intermittent, on the other hand, when the water treatment facility 4 needs to perform water treatment continuously, a plurality of buildings 2 having the above equipment are arranged. A control for distributing the treated water to the buildings that have been sequentially dried may be performed.
[0020]
【The invention's effect】
As is clear from the above description, according to the final disposal method of treated water according to the present invention, the treated water from the water treatment facility is disposed by evaporating and drying, so that crops using public water areas, etc. Can be prevented from being damaged by chloride ions contained in the treated water.
In addition, the evaporation facility has a building in which at least the south surface side of the roof is formed on a transparent glass roof, an intake window is provided on one side, and an exhaust window is provided on the other side, and an intake window provided, easy with a fan for blowing air toward the exhaust window from the intake window portion, an evaporation tank, which is installed inside a building, and a filter mat which is replaceably laid on the bottom of the evaporation tank Since it is a thing of a simple structure, the expense required for installation of a facility can be held down cheaply, and the expense required for disposal of the treated water from a water treatment facility can be reduced.
Furthermore, since the filter mat is installed on the bottom surface of the evaporation tank so that the filter mat can be exchanged, the solid content after evaporation of the water in the treated water is adsorbed to the filter mat. The labor of removing (salin) can be omitted, and this can also reduce the cost required for disposal of treated water.
Furthermore, since the filter mat colored black is used, the filter mat can be endothermic and the water of the treated water can be efficiently evaporated.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a final disposal facility for leachate treated water to which the method of the present invention is applied.
[Explanation of symbols]
1 Evaporation Facility 2 Building 3 Evaporation Tank 4 Water Treatment Facility 5 Transparent Panel 6 Window 7 Fan 9 Heater 11 Solar Power Generation Device (Solar Power Generation Panel)
12 Wind power generator 14 Switch 15 Commercial power supply

Claims (1)

A final disposal method of treated water that treats leachate discharged from a waste disposal site in a water treatment facility and evaporates treated water discharged from the water treatment facility in an evaporation facility,
The evaporation facility is a building in which at least the south surface side of the roof portion is formed on a transparent glass roof, an intake window portion is provided on one side portion, and an exhaust window portion is provided on the other side portion;
A fan that is provided in the intake window and blows air from the intake window toward the exhaust window;
A shallow vessel-shaped evaporation tank that is installed inside the building and temporarily stores treated water supplied from the water treatment facility,
A replacement mat laid on the bottom surface of the evaporation tank, and a filter mat colored in black to adsorb the solid content after water evaporation of the treated water,
When the fan is driven, air is blown from the intake window toward the exhaust window, and the treated water stored in the evaporation tank is brought into gas-liquid contact to evaporate the moisture of the treated water. A method for final disposal of treated water.

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