JPH10286558A - Saltwater distillation method - Google Patents

Abstract

(57) [Summary] To desalinate salt water at low cost, and to reuse cleaning water in cleaning processing of oil-contaminated soil to reduce cleaning processing cost. An evaporating tank (2) to which salt water is supplied, and the evaporating tank (2)
A circulation pump 7 and a sprinkler 8 installed in the
A plastic greenhouse 5 assembled to cover the opening of the evaporating tank 2, a water collecting gutter 6 a installed on the inner surface of the greenhouse 5, and a solar water heater 9 installed outside the greenhouse 5. In the daytime, the circulation pump 7 circulates the salt water in the evaporator tank 2 to the solar water heater 9 to produce hot water. In the nighttime, the water in the evaporator tank 2 is sprinkled by the sprinkler 8 to evaporate. The dew condensation generated on the inside of the wall surface of the pipe 5 is collected in the water collecting gutter 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of desalination in which water having a high salt concentration is distilled using solar heat.

[0002]

2. Description of the Related Art In a desert country with a very high evaporation amount of 3,000 to 6,000 mm per year, when washing oil-contaminated soil with a high salt concentration, a high salt concentration (for example, 12.5% salinity) is used.
%, Oil content 1.3%, sand content 0.5%). At present, a method is employed in which wastewater is guided to an evaporation pond to directly evaporate moisture into the atmosphere. As a desalination technique, a membrane permeation method and an electroosmosis method are known.

[0003]

However, water is a valuable resource in a desert country, and it is a major problem to reuse cleaning water and reduce the cost of cleaning processing. In addition, the use of underground brackish water with high salt concentration, which exists underground, is also a major issue. Furthermore, desalination by the conventional membrane permeation method or electroosmosis method has a problem that the cost is high.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and aims to reduce the cost of washing by desalinating salt water at a low cost and by reusing the washing water in the washing of oil-contaminated soil. It is an object of the present invention to provide a saltwater distillation system capable of performing the following.

[0005]

For this purpose, the salt water distillation system according to the first aspect of the present invention comprises an evaporating tank 2 to which salt water is supplied, a circulation pump 7 and a sprinkler 8 installed in the evaporating tank 2. A greenhouse 5 assembled to cover the opening of the evaporating tank 2,
And a solar water heater 9 installed outside of the greenhouse 5. The salt water in the evaporation tank 2 is circulated to the solar water heater 9 by the circulation pump 7 in the daytime. The present invention is characterized in that hot water is produced by water, and at night, water in the evaporating tank 2 is sprinkled by a sprinkler 8 and evaporated, and dew condensation generated on the inner wall surface of the greenhouse 5 is collected in a collecting gutter 6a. The salt water distillation system according to claim 2, wherein the evaporating tank 2 to which the salt water is supplied, the circulation pump 7, the spray pump 11, the sprinkler pump 12, and the sprinkler 8 installed in the evaporating tank 2; A greenhouse 5 assembled so as to cover the opening, a water collecting gutter 6a installed on the inner surface of the greenhouse 5, and a solar water heater 9 installed outside the greenhouse 5. , Circulation The salt water in the evaporating tank 2 is supplied to the solar water heater 9 by the pump 7 to produce hot water. The hot water is supplied to the sprinkler 8, sprinkled and evaporated, and the salt water is sprinkled on the outer wall surface of the greenhouse 5 by the water sprinkling pump 12. At the time of supply, the wall surface is cooled, and at night, water in the evaporating tank 2 is sprinkled by the sprinkler 8 and evaporated, and dew condensation generated on the inner wall surface of the greenhouse 5 is collected in the water collecting gutter 6a. Note that the numbers added to the above configuration are compared with the drawings for easy understanding of the present invention, and the present invention is not limited thereto.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing one embodiment of the salt water distillation system of the present invention.

In FIG. 1, a water tank 1 and an evaporating tank 2 are installed in the ground, and wastewater (salt water) obtained by washing oil-contaminated soil is supplied to the water tank 1. On the water surface of the water storage tank 1, a floating lid 3 on which a solar cell is attached is floated to prevent evaporation of salt water and to be used as a pump power supply. Water tank 1
The salt water inside is supplied to the evaporation tank 2 by the supply pump 4.
Although the water storage tank 1 is not always necessary, by providing the water storage tank 1, the temperature of the salt water can be increased, and the evaporation efficiency can be improved.

A greenhouse 5 is assembled so as to cover the opening of the evaporation tank 2. This greenhouse 5 uses a general thing used in the field of agriculture, and uses a fluorine-treated vinyl sheet that is resistant to heat and ultraviolet rays. In the present embodiment, the greenhouse 5 is directly fixed to the evaporating tank 2. However, when the greenhouse 5 is enlarged and assembled on the ground around the evaporating tank 2, the greenhouse 5 is prevented from being blown by strong wind. The base of the frame 5 is anchored in the soil with a reinforcing bar or the like, and the sheet is wrapped in the soil to secure the airtightness inside. A plurality of collecting gutters 6a are installed on the inner surface of the greenhouse 5. The collecting gutter 6a also utilizes a gutter for preventing condensation in the greenhouse. Each drainage gutter 6
a is connected to the water collecting pipe 6, and the water collecting pipe 6 is connected to a fresh water tank (1 in FIG. 2).
5).

A circulating pump 7 and a sprinkler 8 are installed in the evaporating tank 2, and a solar water heater 9 is installed on the south side outside the plastic greenhouse 5, and the water in the evaporating tank 2 is sprinkled by a switching valve 10. 8 or the solar water heater 9. In addition,
2a is a precipitation part of a crystal salt.

The operation of this embodiment having the above configuration will be described. In the daytime, the salt water in the evaporation tank 2 is circulated to the solar water heater 9 by the circulation pump 7 to produce hot water by the heat of the sun S. In the night time, the switching valve 10 is switched to discharge the water in the evaporation tank 2 into the sprinkler 8. And water is sprinkled horizontally by the sprinkler 8 to evaporate. When the inside of the greenhouse 5 exceeds the saturated vapor degree, dew condensation is continuously generated on the inner side of the wall of the greenhouse 5 where the temperature is lowered at night.
The dew is collected by the water collecting gutter 6a and stored in the fresh water tank (15 in FIG. 2) by the water collecting pipe 6. The fresh water produced in this way is reused for washing and irrigation.

FIG. 2 is a schematic sectional view showing another embodiment of the salt water distillation system of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. Although the embodiment of FIG. 1 is a method of performing distillation at night, this embodiment is a method of performing continuous distillation day and night. In the evaporating tank 2, a circulating pump 7 for supplying salt water to the solar water heater 9, a spray pump 11 for supplying salt water to the sprinkler 8, and a salt water for supplying water to a sprinkler pipe 13 provided at the top of the outer wall of the greenhouse 5. A watering pump 12 is provided.

The operation of this embodiment having the above configuration will be described. In the daytime, the salt water in the evaporating tank 2 is supplied to the solar water heater 9 by the circulation pump 7 to produce hot water by the heat of the sun S, supplied to the sprinkler 8, and water is sprinkled by the sprinkler 8 in the horizontal direction. To evaporate. In addition, salt water is supplied to the outer wall surface of the greenhouse 5 through the water pipe 13 by the water pump 12 to cool the wall surface of the greenhouse 5. If the inside of the greenhouse 5 exceeds the saturation vapor degree, dew condensation is continuously generated inside the wall surface of the greenhouse 5, and the dew is collected by the collecting gutter 6 a and stored in the fresh water tank 15 by the collecting pipe 6. At night, the circulation pump 7 and the watering pump 12 are stopped, and the water in the evaporating tank 2 is supplied to the sprinkler 8 by the spray pump 11 to evaporate.
During the night, dew condensation is continuously generated inside the wall surface of the greenhouse 5 whose temperature has dropped. The dew condensation is collected by the water collecting gutter 6 a and stored in the fresh water tank 15 by the water collecting pipe 6.

Although the embodiment of the present invention has been described above, the present invention is not limited to the desalination of wastewater generated by the washing treatment of oil-contaminated soil, and various modifications are possible. For example, it is possible to distill underground brackish water with a high salt concentration existing underground and use it as fresh water.

[0014]

As is apparent from the above description, according to the present invention, salt water can be desalinated at a lower cost compared to the existing desalination technology, and at the same time, the water treated in the oil-contaminated soil can be washed. Can be reused, and the cost of the cleaning process can be reduced. Moreover, since it is a simple desalination apparatus, it can be installed anywhere in the desert, and it is also possible to distill underground brackish water having a high salt concentration and use it as freshwater.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a salt water distillation system of the present invention.

FIG. 2 is a schematic sectional view showing another embodiment of the saltwater distillation system of the present invention.

[Explanation of symbols]

2 ... Evaporation tank, 5 ... Greenhouse, 6a ... Collection gutter, 7 ...
Circulation pump 8 ... Sprinkler, 9 ... Solar water heater, 11 ... Spray pump 12 ... Sprinkling pump

Claims (2)

[Claims] 1. An evaporating tank to which salt water is supplied, a circulation pump and a sprinkler installed in the evaporating tank, a greenhouse assembled to cover an opening of the evaporating tank, and an inner surface of the greenhouse. In the daytime, the circulation water pump circulates the salt water in the evaporation tank to the solar water heater to produce hot water, and at night the water is collected. A saltwater distillation method, wherein water in an evaporating tank is sprinkled by a sprinkler to evaporate the water, and dew condensation generated on the inner wall of the greenhouse is collected in a collecting gutter. 2. An evaporating tank to which salt water is supplied, a circulation pump, a spray pump, a sprinkling pump, and a sprinkler installed in the evaporating tank, and a greenhouse assembled so as to cover an opening of the evaporating tank. A water collecting gutter installed on the inner surface of the greenhouse, and a solar water heater installed outside the greenhouse. During the daytime, the circulation pump supplies the salt water in the evaporation tank to the solar water heater to supply hot water. It is supplied to a sprinkler and sprinklers are sprinkled and evaporated.At the same time, salt water is supplied to the outer wall surface of the greenhouse by a watering pump to cool the wall surface.At night, water in the evaporating tank is sprinkled by the sprinkler. A salt water distillation system characterized by collecting the dew that forms on the inside of the wall of the greenhouse by evaporating it into a collecting gutter.