JPH02187189A - Submerged filter apparatus - Google Patents

Abstract

PURPOSE:To easily obtain fresh water by mounting a filter membrane body to the lower end of a pipe protruding above the surface of the sea at the upper end part thereof and deeply inserted in the sea at the lower end part thereof and providing a pumping means to the upper end thereof. CONSTITUTION:When the storage pump 23 of a pumping means 22 is driven, the water in a pipe 5 and a reverse osmosis membrane body 6 is sucked from a water suction hole 25a by the suction force of the storage pump 23 and passes through a pumping pipe 25 to be pumped up to the land while the water level in the pipe 5 falls to the vicinity of the reverse osmosis membrane body 6. By the difference between the water levels inside and outside the pipe 5, the pressure of seawater almost equal to the depth of water of the reverse osmosis membrane body 6 acts on the outer peripheral surface 6c of the reverse osmosis membrane body 6. The salt, ions and pollutant in the seawater 2 acting on the outer peripheral surface 6a are separated and removed by the reverse osmosis membrane body 6 and clean fresh water 3 permeates the reverse osmosis membrane body 6. By this method, power to be used can be reduced without requiring a high pressure pump.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a deep filtration device, for example, for removing the salinity of so-called domestic or industrial fresh water used in industries such as buildings, agriculture, industry, and medicine. and a deep filtration device manufactured from seawater containing pollution-causing substances.

(Prior Art) Conventionally, in large cities and coastal areas, there are filter membranes for water treatment that remove salt and various pollution-causing substances from seawater and obtain fresh water. There is a filtration device that has a built-in filter (so-called OF, RO). This filtration device is installed on land or in a coastal area, and seawater is collected from the sea, dirt and foreign matter are removed, and the water is introduced to the filtration device through a pipe or the like. Next, the seawater is pressurized by a high-pressure pump (30 to 35 kg/c distillation) and is supplied to one side of the filtration membrane in the filtration device. Seawater permeates from one side of the filtration membrane to the other and is desalinated.

(Problem to be solved by the invention) However, such a filtration device requires pressurizing seawater using a high-pressure pump and supplying this pressurized seawater to one side of the filtration membrane through a pressure-resistant pipe. There is a problem in that a high-pressure pump that consumes a large amount of electricity to pressurize and supply seawater and high-pressure pipe piping to transport the high-pressure seawater are required.

Therefore, an object of the present invention is to provide a deep filtration device that does not require a high-pressure pump, high-pressure pipe piping, etc. to pass seawater from one side of a filtration membrane to the other side and extract fresh water.

(Means for Solving the Problems) A deep filtration device according to the present invention includes a pipe whose upper end protrudes above the sea surface and whose lower end is deeply inserted into seawater, and which is connected to the lower end of the pipe, and which connects the pipe to the lower end of the pipe. An ill that is formed to seal and permeate through the natural pressure of seawater, turning seawater into fresh water.
It is characterized in that it is equipped with a membrane and pumping means for pumping the permeated freshwater to outside the upper end of the pipe, and obtains freshwater from seawater.

Further, it is preferable to provide a foreign matter removing means near the side surface of the filter membrane body on the seawater side, which moves along the side surface and removes foreign matter adhering to the side surface. Moreover, it is preferable to provide a protection means for protecting the filter membrane body on the outside of the filter membrane body. Moreover, it is preferable that the filtration membrane body is a reverse osmosis membrane body (UF, RO).

Here, seawater refers to water that contains pollutants such as salt, ions, garbage, and protein, and freshwater refers to clean water that does not contain these pollutants.

In addition, ``filtration membrane body'' refers to reverse osmosis membrane (Reverse 0
5mo-5is Filter, abbreviated as RO) or ultrafiltration membrane (Ultra Filter)
(abbreviated as UF), which is formed from synthetic polymer materials or natural materials.

Specifically, the reverse osmosis membrane body is, for example, a multilayer structure made of a heat-resistant polysulfone resin as a base and a polyvinyl alcohol membrane or a polyethersulfone membrane, and is subjected to high pressure of approximately 7 to 35 kg/c+a. Use under pressure. In addition, ultrafiltration membranes are made of polyolefin resin, polysulfone resin, and polyimide resin, and approximately 3.
Used under low pressure of kg/cj.

(Function) The deep filtration device according to the present invention has a filtration membrane body and a pumping means connected to the lower end of a pipe inserted deeply into seawater, so the water in the pipe is pumped up by the pumping means,
When the water level inside the vibrator is lowered deeply, seawater pressurized by natural pressure corresponds to the depth of the seawater on the membrane surface on the seawater side of the filtration membrane body, corresponding to the height difference between the water surface inside and outside the vibrator. acts. Pollution-causing substances such as salt, ions, dirt, and protein in the pressurized seawater are captured and separated and removed within the filtration membrane, and only the clean component water in the seawater passes through the filtration membrane and becomes fresh water. This fresh water is pumped up to the outside of the upper end of the pipe by the pumping means.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1.2 is a diagram showing an embodiment of the depth filtration device according to the present invention. In FIG. 1, l is a depth filtration device, which removes salt, ions, and pollution-causing substances from seawater 2 to produce fresh water 3. Depth filtration device 1
The upper end 5a protrudes above the sea surface 2a and the lower end 5b is inserted into the seawater to a depth of about 100 m and is made of a large and long stainless steel pipe 5.
It has a cylindrical reverse osmosis membrane body 6 connected to a flange 5C at the lower end 5b. An annular upper lid 8 is bolted to the upper end 6a of the reverse osmosis membrane body 6 to the flange 5c of the pipe 5, so that the inside of the pipe 5 and the inside of the reverse osmosis membrane body 6 are communicated with each other. A disk-shaped bottom cover 9 is provided at the lower end 6b of the reverse osmosis membrane body 6, and seals the lower end 6b of the reverse osmosis membrane body 6.

Reference numeral 11 denotes a surface washer which is a means for removing foreign matter. The surface washer 11 includes four lead screws 12 which also serve as pillars and which are provided between the top cover 8 and the bottom cover 9 so as to be spaced apart from the outer peripheral surface 6c of the reverse osmosis membrane body 6, and the lead screws 12 are threaded. An annular molding brush 13 that is attached to a mating carriage and can move up and down in the figure while contacting the outer circumferential surface 6c, and a gear 15 provided on the upper end 12a of the lead screw 12.
and an underwater motor 17 that can be rotated in forward and reverse directions and connected by a rack/bin mechanism.

A protective wire mesh 20 is a protection means, and the protective wire mesh 20 is provided to cover the outside of the surface washer 11 from the top cover 8 to the bottom cover 9. The protective wire mesh 20 has a predetermined mesh size and separates and removes foreign substances such as dirt, stones, seaweed, and fish that approach the outer circumferential surface 6c of the reverse osmosis membrane body 6 with the flow of seawater 2 on the outer circumferential surface 6Cy.

Reference numeral 22 denotes a pumping means, and the pumping means 22 includes a vacuum pump 23 installed on land and a pump pipe 25 that extends from the vacuum pump 23 through the pipe 5 to the vicinity of the reverse osmosis membrane body 6. have. A water suction hole 25a is provided at the tip of the pumping pipe 25, and by driving the vacuum pump 23, the fresh water 3 in the reverse osmosis membrane body 6 is pumped up to the land, and the water surface in the pipe 5 is brought to the vicinity of the reverse osmosis membrane body 6. It is possible to descend. Moreover, instead of the vacuum pump described above, a normal pump may be used depending on the water depth, or a reverse osmosis membrane body 6 may be used.
An ice pump or the like may be installed near the

27 is a water quality conditioner, and the water quality conditioner 27 includes a water quality conditioning tank 28 installed on land, and a water quality conditioning injection pipe 29 connected to the water quality conditioning tank 28 and having an opening 29a near the water intake hole 25a of the pumping pipe 25. It is possible to harmonize the pH by adding harmonized water to the fresh water 3 that has passed through the reverse osmosis membrane body 6 as needed.

Next, the effect will be explained.

When the water pump 23 of the water pumping means 22 is driven, the water in the pipe 5 and the reverse osmosis membrane body 6 is sucked from the water suction hole 25a by the suction force of the water pump 23, passes through the water pump 25, and is pumped to the land. The water level in the pipe 5 drops to the vicinity of the reverse osmosis membrane body 6.

The outer peripheral surface 6C of the reverse osmosis membrane body 6 due to the water level difference inside and outside the pipe 5
approximately 10 kg/a, which is approximately equal to the water depth of the reverse osmosis membrane body 6.
Il! The natural pressure of the seawater 2 acts, and a flow of the seawater 2 approaching the reverse osmosis membrane body 6 is generated. Sediment, seaweed, and fish in Seawater 2 are protected funds! i! 20, and almost only seawater passes inside the protective wire mesh 20. The salts, ions, and pollution-causing substances in the seawater 2 that have acted on the outer peripheral surface 6C of the reverse osmosis membrane body 6 are separated and removed by the reverse osmosis membrane body 6, and these salts, ions, and pollution substances are contained in the reverse osmosis membrane body 6. Clean fresh water 3 containing no causative substances passes through. Freshwater 3 is
The water passes through the pumping pipe 25 and is pumped up to land by the pumping pump 23, and is supplied for each purpose.

By this pumping, the water level in the pipe 5 is maintained almost in the vicinity of the reverse osmosis membrane body 6, and the high-pressure seawater 2 due to natural pressure always acts on the outer peripheral surface 6C of the reverse osmosis membrane body 6, and the fresh water 3 is transferred from the seawater 2. Manufactured continuously.

Further, if necessary, a conditioner is injected from the water quality conditioning tank 28 through the water quality conditioning injection pipe 29 by the water quality conditioner 27, and the PI of the fresh water in the reverse osmosis membrane body 6 is adjusted. As mentioned above, the manufacturing process depends on the natural pressure difference of seawater corresponding to the difference in the water level inside and outside the pipe 5, so a high-pressure pump and high-pressure pipe piping are required to supply seawater to the outer peripheral surface 60 of the reverse osmosis membrane body 6. etc., and power consumption can be significantly reduced.

In addition, the surface washer 11 rotates the lead screw 12 in the forward and reverse directions via a rack and pinion mechanism by turning on the power to the submersible motor 17 from land at predetermined intervals or when necessary. outer circumferential surface of the body 6
It moves up and down while making contact with C to scrape off and remove fine contaminants and fine foreign matter adhering to the outer circumferential surface 6C. As a result, the surface of the outer circumferential surface 60 of the reverse osmosis membrane body 6 becomes clean again, and the seawater 2 is transferred to the reverse osmosis membrane body 6 as described above.
By passing through the water, clean fresh water 3 is produced.

In the above embodiment, the case where the filtration membrane body is a reverse permeation membrane body was explained, but the filtration membrane body is not limited to this embodiment, and when the water depth is shallow, the filtration membrane body can be used to limit the permeation of seawater at low pressure. External) It may be a filtration membrane body.

Moreover, although the case where the filter membrane body is cylindrical has been described, it may be plate-shaped or irregularly shaped.

(Effects) As explained above, according to the present invention, there is no need for high-pressure pumps and high-pressure piping, and seawater is permeated from one side of the filtration membrane to the other side using the natural pressure of seawater, and freshwater is released. Obtainable.

[Brief explanation of the drawing]

Fig. 1.2 is a diagram showing the depth filtration device of the present invention, Fig. 1 is an overall schematic view including a partial cross section, Fig. 2 (a) is an enlarged plan view of the main part, and Fig. 2 ( b) is an enlarged front view of the main part. 1...Deep filtration device, 2...Seawater, 3...Fresh water, 5...Pipe, 6...Reverse osmosis membrane body ( filtration membrane body), 11...
... Surface cleaning machine (foreign matter removal means), 20 ... Protection wire mesh (protection means), 22 ... Water pumping means, 27 ... Water quality conditioner. Acting “patent attorney” Aigagun Part

Claims (4)

[Claims] (1) A pipe whose upper end protrudes above the sea surface and whose lower end is deeply inserted into the seawater, and which is connected to the lower end of the pipe.
To obtain fresh water from seawater, comprising a filtration membrane body formed to seal a pipe and which is permeated by the natural pressure of seawater and converts the seawater into fresh water, and a pumping means for pumping the permeated fresh water to outside the upper end of the pipe. A deep filtration device featuring: (2) The deep filtration device according to claim 1, further comprising a foreign matter removing means that moves along the side surface of the filtration membrane body on the seawater side and removes foreign matter adhering to the side surface. (3) The deep filtration device according to claim 1 or 2, further comprising a protection means for protecting the filtration membrane provided on the outside of the filtration membrane. (4) The deep filtration device according to claim 1, 2 or 3, wherein the filtration membrane is a reverse osmosis membrane.