JPH11262753A - Method and apparatus for water treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the quantity of carbon dioxide in water and to prevent the generation of green alga by a method in which raw water is acidified, aerated with nitrogen, neutralized. and aerated with oxygen. SOLUTION: Raw water 2 is sent to an electrolytic water generator 6 through a filter 4 by a pump 5 and is separated into acidic water 13 and alkaline water 15. The acidic water 13 is sent to the first tank 10, and the alkaline water 15 is sent to the second tank 11. The acidic water 13 of the first tank 10 is aerated with nitrogen supplied from a gas separator 18 to discharge carbon dioxide and oxygen, sent to the second tank 11 to be mixed with the alkaline water to be neutralized, and sent to the third tank 12. Here, oxygen is supplied from the gas separator 18 for aeration to enrich oxygen. Water, after being stored to a regular amount of storage, is discharged from a discharge opening 17. In this way, the concentration of carbon dioxide is decreased, and the generation of water bloom can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water treatment device,
In particular, the present invention relates to a water treatment device for a lake, a river, a canal, a reservoir, a water tank, or the like.

[0002]

2. Description of the Related Art Conventionally, a treatment layer carrying microorganisms has been immersed in a closed water area such as a lake or a water tank, and the surrounding water has been sucked by a water collection pipe provided in the center of the treatment layer. By
2. Description of the Related Art There is known a water purification device that allows treated water to pass through a treatment layer. In this device, the compressed air supplied from the air compressor is jetted from the air jetting section into the water collecting pipe, thereby forming a water flow in the water collecting pipe and supplying oxygen to the water to be treated.

[0003]

However, as a result of the deterioration of the water quality in the above-mentioned water area, the occurrence of algae called blue-green algae has become a problem. In addition, factors that promote the occurrence of blue water include the concentration of nitrogen, phosphorus, carbon dioxide, and organic compounds in water, the temperature of water, the amount of light in water, and the like. However, the water purification apparatus requires a large amount of microorganisms to prevent the occurrence of blue water, and there is a problem that purification treatment cannot be performed sufficiently in winter or the like when the activity of microorganisms decreases. ing. The present invention has been made in view of the above circumstances, and has as its object, in particular, to reduce the amount of carbon dioxide in water to thereby prevent the occurrence of blue-green algae.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in the treatment of the above-mentioned water to be treated, a step of acidifying the water to be treated and a step of converting the acidified water to be treated with nitrogen. , A process of neutralizing the water to be treated after nitrogen aeration, and a process of aerating the neutralized water to be treated with oxygen.

[0005] Here, an electrolytic water generator for producing acidic water and alkaline water is prepared, the water to be treated is acidified by using the acidic water, and the water to be treated is neutralized by using the alkaline water. May be.

[0006] Further, a gas separation device for separating nitrogen and oxygen from air is prepared, and the water to be treated is aerated with nitrogen using the separated nitrogen, and the water to be treated is separated using the separated oxygen. It may be aerated with oxygen.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the structure of the water treatment apparatus according to the present invention. Reference numeral 3 denotes a pipeline for guiding the water 2 to be treated. The pipeline 3 is provided with a filter 4 and a pump 5 from the upstream side. And an electrolyzed water generator 6 for generating alkaline water.

Reference numeral 7 denotes a processing tank.
The partition 9 is divided into a first tank 10, a second tank 11, and a third tank 12, and the height of the partition 8 is set higher than that of the partition 9. In the first tank 10, a pipe 14 for supplying the acidic water 13 from the electrolyzed water generator 6 extends, and in the second tank 11, a pipe 16 for supplying the alkaline water 15 from the electrolyzed water generator 6. Is extending. On the other hand, the third tank 12 is provided with a discharge port 17 that can be freely opened and closed.

Reference numeral 18 denotes a gas separation device for separating nitrogen and oxygen from air. A line 19 for supplying nitrogen extends from the gas separation device 18 toward the first tank 10.
The tip 19a of the first tank 10 extends horizontally at the lower end of the first tank 10, and a plurality of nozzles 20 are formed on the tip 19a upward along the extending direction. Similarly, a line 21 for supplying oxygen extends from the gas separation device 18 toward the third tank 12, and a distal end 21 a of the line 21 is connected to the third tank 12.
Is extended horizontally at the lower end of the
A plurality of nozzles 22 are formed upward along the extension direction. The filter 4, pump 5, electrolyzed water generator 6, treatment tank 7, gas separator 18, and pipelines 3, 14, 16, 19, and 21 constitute a water treatment apparatus 1 in a schematic manner.

Next, the operation of the water treatment apparatus 1 having the above configuration will be described. The water to be treated 2 is introduced into the pipe 3 by the action of the pump 5, passes through the filter 4, and is separated into the acidic water 13 and the alkaline water 15 by the electrolytic water generator 6. The separated acidic water 13 is supplied to the first tank 10 through a pipe 14 and the separated alkaline water 1
5 is supplied to the second tank 11 via the pipe 16.

The first tank 10 includes a gas separation device 18.
Is supplied through a line 19 with nitrogen. This nitrogen forms fine bubbles 23 from the nozzle 20 and
As a result, the acidic water 13 stored in the first tank 10 is aerated with nitrogen, and carbon dioxide and oxygen in the acidic water 13 are released to the atmosphere.

The acid water 13 after aeration flows into the second tank 11 over the partition 8 and is mixed with the alkaline water 15 supplied to the second tank 11. As a result, the acidic water 13 is neutralized by the alkaline water 15 in the second tank 11. The neutralized water flows into the third tank 12 over the partition wall 9.

Further, a gas separating device 18 is provided in the third tank 12.
Is supplied through a pipe 21 from the oxygen supply. This oxygen is converted into fine bubbles 24 from the nozzle 22 to form the third tank 12.
As a result, the water stored in the third tank 12 is aerated with oxygen, and the oxygen in the water is enriched. Third tank 12
When the amount of water stored in exceeds the predetermined value, the outlet 17 is opened, and water (treated water) having a low carbon dioxide concentration and a high oxygen concentration in the third tank 12 is returned to the water area to be treated.

In the water treatment apparatus 1, the acidic water 13 derived from the water to be treated 2 is aerated in the first tank 10 with nitrogen, whereby carbon dioxide in the water is released into the atmosphere. Therefore, the concentration of carbon dioxide in the treated water is reduced, and the occurrence of blue water is suppressed. The acidic water 13 is also neutralized in the second tank 11 with the alkaline water 15 derived from the water 2 to be treated, so that the pH of the treated water is maintained within the environmental standard.

On the other hand, with the aeration in the first tank 10, oxygen in the acidic water 13 is also released into the atmosphere.
Due to the oxygen supplied by aeration in the inside, the oxygen concentration of the treated water is increased. Therefore, the growth of aerobic aquatic organisms in the water area to be treated is not hindered by the supply of treated water.

It is to be noted that the acidic water 1 is
Instead of obtaining 3 and the alkali water 15, an acid and an alkali may be supplied to the first tank 10 and the second tank 11, respectively, to acidify and neutralize the water 2 to be treated.

Further, as the gas separating device 18, a device for separating oxygen from other gases may be used. In this case, air after oxygen separation, that is, nitrogen and carbon dioxide, is supplied to the acidic water 13 in the first tank 10, but the carbon dioxide is released into the atmosphere with the aeration in the first tank 10. Therefore, there is no adverse effect due to the supply of carbon dioxide.

[0018]

As described above, according to the present invention, by releasing carbon dioxide in the water to be treated into the atmosphere,
The concentration of carbon dioxide in the water to be treated, which is one of the causes of blue water, decreases. Therefore, it is possible to suppress the occurrence of blue water in the water area to be treated.

In addition, the oxygen concentration of the water to be treated is increased by aerating the water to be treated with oxygen, so that the growth of aerobic aquatic organisms in the water area to be treated is inhibited by the supply of the treated water. There is no.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the structure of a water treatment apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water treatment apparatus 2 Treated water 6 Electrolyzed water generation apparatus 13 Acid water 15 Alkaline water 18 Gas separation apparatus

Claims (3)

[Claims] A step of acidifying the water to be treated, a step of aerating the acidified water to be treated with nitrogen, and a step of neutralizing the water to be treated after nitrogen aeration. A process of aerating the water to be treated with oxygen. 2. The water to be treated is acidified, the acidified water to be treated is aerated with nitrogen, the water to be treated after aeration with nitrogen is neutralized, and the water to be neutralized is treated with oxygen. In the water treatment device for aeration, an electrolytic water generation device for producing acidic water and alkaline water is provided, the treated water is acidified using the acidic water, and the treated water is neutralized using the alkaline water. A water treatment apparatus, comprising: 3. The water to be treated is acidified, the acidified water to be treated is aerated with nitrogen, the water to be treated after aeration with nitrogen is neutralized, and the neutralized water to be treated is treated with oxygen. In the water treatment device for aeration, a gas separation device for separating nitrogen and oxygen from air is provided, the treated water is aerated with nitrogen using separated nitrogen, and the treated water is separated using separated oxygen. A water treatment device characterized by aerating oxygen with oxygen.