JPS60248292A - Method and apparatus for purifying water of river and lake and seawater - Google Patents

Abstract

PURPOSE:To reduce energy in water purification by utilizing the fluidizing force due to the density difference between water and air, and reducing the delivery pressure of air. CONSTITUTION:In water purification by aeration, the vicinity of an air ejection port is formed of a double structure, the ejection port is located at a position higher than the inflow port of water, and the fluidizing force due to the density difference between water and air is utilized. Consequently, the delivery pressure of air is decreased because the density is reduced due to the bubbles which are formed in the pipe several minutes after the supply of air is started and the necessary stress is simultaneously reduced. Accordingly, water is purified, and the energy is reduced.

Description

[Detailed Description of the Invention] In recent years, the quality of water in rivers, lakes, marshes (including dams) and the sea due to industrial wastewater and domestic wastewater has deteriorated significantly, causing bad odors in raw water and making it impossible for fish and shellfish to live. ing.

The reasons for this are: (1) In the case of rivers, the BOD becomes high due to industrial wastewater, and in rivers with a low flow rate that is almost stagnant, there is a lack of oxygen supply, resulting in an oxygen-deficient situation. At that point, methane gas (CH
4).

Ammonia (NH4+), hydrogen sulfide (H2S).

Mercaptans are generated and produce a bad odor.

In other words, it becomes a river of death.

(2) The inflow of organic (N, P, etc.) domestic wastewater consumes dissolved oxygen in the water, which also becomes anaerobic.

In addition, in the case of stagnant lakes and sea areas, (1) the inflow of natural or domestic wastewater containing a large amount of organic matter such as N and P, which is the same as in rivers, causes an oxygen deficiency and generates a foul odor;
Nutrient salts are produced through the decomposition of organic matter. This state of high nutrient content is called eutrophication. Nutrient salts then cause abnormal growth of plankton and algae (this is when red tide occurs in the ocean), increasing oxygen consumption in the water and creating an oxygen-deficient state, causing tap water to become foul-smelling and causing fish and shellfish to rot and die.

(2) From autumn to winter, the water temperature near the water surface in lakes and marshes is cooled by the low temperature of the outside air.

Displacement with warmer water at the bottom of the lake, or a convection phenomenon (cooled, denser water sinks, warmer, less dense water rises), equalizes dissolved oxygen in lake water, etc. However, from spring to summer, the water temperature near the water surface is higher than the water temperature at the lake bottom, so the phenomenon of displacement (convection) within the lake water does not occur. Therefore, water in the middle to lower layers such as lake water becomes oxygen-deficient. Even under this situation, CH, NI-T due to the activity of anaerobic bacteria
, +, H2S, etc. are generated and a bad odor is generated.

As can be seen from the following, the cause of the deterioration of water quality in lakes and marshes is the result of oxygen deficiency in water caused by industrial wastewater, domestic wastewater, etc. Therefore, if the Do (dissolved amount of oxygen) in water is increased by some method, the problem will be solved.

Conventionally, the following methods have been implemented or planned in order to increase or equalize the Do (dissolved oxygen).

(1) Simple aeration method: In this method, air is ejected at equal intervals to the bottom of lakes, marshes, etc.] Arrange the air pipes with 1 installed, and use a compressor to pass the air through the air pipes to the gray water from the air spout. This is a method of measuring convection in lakes and marshes by forcibly increasing Do in the water by releasing air into the water, and by using flow energy due to the density difference between air and water.

However, in this method, it is necessary to constantly send air at a pressure equivalent to the water pressure at the air outlet. Therefore, sending air requires a large amount of energy, which is uneconomical.

(2) Method of temporarily storing air in a container and releasing it all at once: In this method, an appropriate container is installed at the bottom of a lake or pond, with an air pipe attached, and then air is filled into the container. Next, the mouth of the container is opened all at once to attempt to replace the water in lakes and marshes by convection. However, this method also requires a large amount of air and pressure to completely replace the water in lakes, marshes, etc., and is extremely uneconomical. In such a case, the water in lakes and marshes may spray several meters above the water surface, and there is a possibility that extremely loud explosion sounds and vibrations will be generated, causing great damage to the surrounding area.

(3) Replacement method by pumping: In this method, the pump is lowered to near the bottom of the lake, etc., and the water is pumped up by the pump and discharged to the water surface to replace the water in the lake, etc.

In this case, a large number of pumps are required, and therefore the cost of equipment is enormous and the power source for operating the pumps is also large, making it uneconomical.

(4) Mechanical stirring method: There are roughly two types of stirring methods.
One is the method described in ``(1)'', in which the rising energy of air released in lakes, etc. is collected in a turbine (waterwheel), and the turbine is rotated to agitate and homogenize the water in lakes, marshes, etc.

One method is to homogenize the water quality by rotating a stirrer using the power of a motor or the like.

Regarding the 01f type, since the released energy is utilized, it is very economical when considering the rotational energy of the turbine alone.

No effect of reducing the air supply force of the energy source can be expected. Regarding the latter.

The energy required to rotate the stirrer is enormous and is very uneconomical.

*The present invention is a water purification method using air python similar to (1), but the area near the air outlet has a double structure, or the outlet is located higher than the inflow of water (1-■), and the difference in density between water and air is Because the mechanism uses fluid force, the required pressure becomes smaller because the density of the air is reduced by the foam (mixture of air and water) that forms inside the pipe several minutes after the air is started. Therefore, this device and its mechanism are optimal as a water purification and energy reduction method.1 The present invention will be explained below with reference to the drawings.

FIG. 1 is an overall diagram of the installation of this device. FIG. 2 is a sectional view of this device, and FIG. 3 is a three-dimensional schematic diagram of the same.
(1) is a complete part, (2) air pipe, (6
) is the outer pipe with a double pipe structure, (4) is the float that moves the pipe upwards, and (5) is the filter for the sediment inflow (6).
It is a pipe that blows out air, and is an inner pipe with a double pipe structure (the force is the outlet for foam, and (8) is the bottom and ground surface of lakes and marshes. (9) is water such as lakes and marshes.

First, the air created and compressed by the compressor in (1) passes through the air pipe in (2-b), pushing out the water that was in the double pipe in (6-b), and air in (6-C). Exhale [reach 1. Next, the air pressure (6~C
) When the water pressure becomes higher than the water pressure at point (6 to C), it is ejected from the outlet at point (6 to C) into the outer pipe at point (3 to b). At that point, the density inside the pipe (3-1) decreases. (3-b)
Water from lakes and marshes (9), which has a high density due to a decrease in density within the water, flows from the filter section (5) into the pipes (3-b) with a force that equalizes the density difference in the water. The position of the filter in (5) must always be lower than the outlet in (6 to C). The air ejected to (3-b) may become bubbles independently due to the difference in density with water and water pressure and be pushed up, or it may become foam and rise upwards (emitted from the air outlet (c)).

(Since the foam released from Ha is a mixture with air, it causes convection of water in lakes and marshes while increasing DO in the water.
It promotes homogenization of water and plays a role in purifying water quality. Furthermore, since the water flowing in from the filter (5) also mixes with the air ejected from (6 to C), the density decreases. Therefore, the pressure sent out from the compressor is equivalent to or slightly higher than the pressure inside the pipe (3 to b).

To summarize the features of the present invention as described above, by sending air into a pipe that is vertically set underwater and open at both ends, the density inside the pipe is reduced, and the pressure of the air that is continuously sent to the secondary pipe is reduced. This is an energy-saving water purification device.

Procedural amendment document Showa year, month, day 1 Indication of case 1982 Patent Application No. 35731 2
Name of the invention Method and device for purifying the quality of rivers, lakes, and seawater by air rays 3 Relationship with the case of the person making the amendment Patent applicant 4 Date of amendment order May 9, 1980 5 Target of amendment HB Steel + 1 jt 17'N) J B Hino detailed WII
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Contents of amendment 1: Insert 13, Detailed description of the invention, between lines 8 and 9 on page 1 of the specification.

2. On page 8 of the specification box, after line 15, add the following sentence: 14. "Brief explanation of the drawings."

Amend items 1 and 2 above and attach the documents as attached.

[Omissions in the detailed description of the invention] should be amended by writing ``Detailed description of the invention'' in the brief description column.

``Because the document that accurately described the drawing was incomplete,'' the statement was amended with a ``brief explanation of the drawing.''

3. Detailed description of the invention 4. Brief description of the drawings Figure 1 is a schematic diagram of the overall mechanism Figure 2 is a sectional view of this device Figure 3 is a three-dimensional schematic diagram of this device (1) Compressor (2) Air Pipe (3) Outer pipe with double pipe structure (4) Float to move the pipe upwards (5) Filter to prevent the inflow of earth and sand (6) Inner pipe with double pipe structure that blows out air (7) Foam outlet (8) Bottom and ground surface of lakes, marshes, etc.

Claims (1)

[Claims] Device and mechanism that reduces the air pressure of aeration during water purification by using the density difference between water and air