JPH0994438A - Dipping type production of purified water and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and easily produce a purified water without using an artificial power source by sinking a reverse osmotic membrane separator into depth of water, on which a water pressure equal to or above the osmotic pressure is imposed, communicating the permeated water side of the separator with atmosphere and pulling up to the water surface after the permeated water is stored in a permeated water receiver. SOLUTION: The permeated water permeating through a reverse osmotic membrane 1B in a pressure vessel 1A is stored in the permeated water receiver 3 at the time of opening a handy valve 4 of a communicating pipe 5 on the water surface after sinking the reverse osmotic membrane separator 1 in the depth of water, on which the water pressure equal to or above the osmotic pressure is imposed. At the same time, air in the receiver 3 is discharged through the communicating pipe 5 to atmosphere. A supporting rope 11 connected to the reverse osmotic membrane separator 1, the permeated water receiver 3 or the like is pulled up until the receiver 3 is lifted on the surface to recover the permeated water.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention uses an artificial power source such as electricity from a raw water such as river water, lake water, groundwater or seawater containing various organic substances and ions by membrane separation such as reverse osmosis membrane. TECHNICAL FIELD The present invention relates to an immersion water purification method and apparatus for producing purified water that can be used for cleaning applications and beverage applications without the need. More specifically, even if there is no power supply or water supply, or if there is no power supply outside, or if the power supply or water supply is temporarily stopped after a disaster such as a typhoon or an earthquake, water purification can be performed at any time. The present invention relates to a method and an apparatus for manufacturing immersion-type purified water that can be manufactured safely and easily.

[0002]

2. Description of the Related Art River water containing various organic substances and ions,
In order to produce purified water that can be used for cleaning and drinking from raw water such as lake water, groundwater, or seawater, it is necessary to reduce various organic substances and ions contained in the purified water to predetermined concentrations.
Conventional water purification technologies include sand filtration, coagulation sedimentation, chlorination, and activated carbon adsorption, as known in the water supply technology. It is used.

With recent advances in polymer technology, devices for obtaining purified water using various separation membranes have become popular. Separation membranes include ultrafiltration membranes and reverse osmosis membranes.Ultrafiltration membranes are used exclusively to remove minute dust, Escherichia coli, etc. in water, and reverse osmosis membranes are all organic substances dissolved in water. And used to remove ions.

The separation membrane technology has an advantage that it can treat a relatively large volume of water in a small space as compared with the above-mentioned conventional technology, and can easily add an apparatus in the future.

In the above-mentioned separation membrane technology, there are some uses depending on the quality of water to be handled and the type of power source.
1-4 kg / kg for tap water with good raw water quality
An ultrafiltration membrane that can be filtered with only a water pressure of about ² cm is used, but a reverse osmosis membrane that requires a large power to generate a high pressure of 5 kg / cm ² G or more is used at a water purification plant with relatively poor raw water quality. Have been.

Reverse osmosis membranes are used because river water, lake water, ground water, sea water and the like containing various organic substances and ions have relatively poor raw water quality. Therefore, in order to produce purified water that can be used for cleaning and drinking from the above raw water, use a motor-driven high-pressure pump if there is an artificial power source such as electricity, or use high pressure if there is no artificial power source such as electricity. It is common to use an operable manual pump or a high-pressure pump that uses an outdoor power source such as an engine pump.

[0007]

However, unlike the case of land, it is often difficult to secure a place to install the reverse osmosis membrane device on water or sea, and an artificial power source is installed. There are few things. Therefore, because it is not possible to obtain purified water easily on water or on the sea, it was necessary to transport the purified water obtained on land.

The object of the present invention is to solve the above-mentioned problems of the prior art, and reverse osmosis is performed from raw water such as river water, lake water, ground water or sea water containing various organic substances and ions. Immersion type that can safely and easily produce purified water that can be used for cleaning applications and beverage applications at any time without using an artificial power source such as electricity and without using a pumping device for pressurization due to membrane separation of the membrane It is to provide a purified water manufacturing method and an apparatus thereof.

[0009]

In the immersion type purified water production method of the present invention, raw water is supplied to a reverse osmosis membrane separator to obtain purified water by separating concentrated water and permeated water in the reverse osmosis membrane. In the method, the reverse osmosis membrane separator is submerged to a water depth above the osmotic pressure, the permeate side of the reverse osmosis membrane separator and the atmosphere are communicated with each other, and the permeated water is stored in a permeate receiver, and then the water surface. It is configured to collect the permeated water by pulling it up to. Further, the immersion water purifying apparatus of the present invention comprises a lead-out path for leading out permeated water from the reverse osmosis membrane separator, a permeated water receiver arranged in the lead-out path, the reverse osmosis membrane separator and the permeate. A check valve arranged in the outlet passage between the water receiver and a communication pipe for communicating the permeated water receiver with the atmosphere; and the communication pipe for connecting the reverse osmosis membrane separator to an osmotic pressure or more. It is configured to have a length that allows it to be submerged under water pressure.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing an example of the immersion type water purifying apparatus used in the present invention. FIG.
In the above, the raw water 10 is supplied to the pressure resistant container 1A of the reverse osmosis membrane separator 1 which is submerged in a water depth where a water pressure higher than the osmotic pressure is applied, and various organic substances and ions are removed in the reverse osmosis membrane 1B in the pressure resistant container 1A. Thus, the permeated water 14 having improved water quality and, conversely, the concentrated water 13 in which various organic substances and ions are concentrated and the water quality is reduced are separated. The permeated water 14 passes through the outlet passage 1C, passes through the check valve 6 in the forward direction, and is stored in the permeated water receiver 3.
The communication pipe 5 connects the permeated water receiver 3 and the atmosphere, and consequently the reverse osmosis membrane separator 1 and the atmosphere. The communication pipe 5 has a length such that the reverse osmosis membrane separator 1 is submerged in a water depth to which a water pressure higher than the osmotic pressure is applied. The hand valve 4 is arranged on the atmosphere side of the communication pipe 5, that is, on the water surface side.

The raw water to be treated in the present invention is river water, lake water, ground water, seawater or the like containing various organic substances and ions, and water that cannot be used as it is for cleaning or drinking is used. Further, although it can be used as it is for cleaning applications and beverage applications, it can also be used for further enhancing the degree of purification.

The reverse osmosis membrane separator 1 as a separating means is preferably equipped with a separation membrane having a high removal rate and a high permeation flux even under a low pressure operation. For example, polyamide manufactured by Nitto Denko KK System reverse osmosis composite membranes are suitable. As the module type of the separation membrane, a hollow fiber type or a spiral type is used, but a spiral type that can easily attach and detach the module and can be easily maintained is preferably used. The material of the reverse osmosis membrane 1B is not particularly limited, but a polyamide-based reverse osmosis composite membrane is preferably used.

The pressure vessel 1A and the permeated water receiver 3 are not particularly limited as long as they are pressure resistant materials that can withstand water pressure, but stainless steel such as metal materials SUS316L, SUS316, SUS304L and SUS304 are preferably used.

The materials and models of the check valve 6 and the hand valve 4 are not particularly limited, but SUS which is less corrosive.
Made of 316 stainless steel, the check valve 6 is a lift type check valve,
The hand valve 4 is preferably a ball valve.

The material of the communication pipe 5 is not particularly limited as long as it is a pressure resistant material capable of withstanding water pressure, but a flexible tube made of polypropylene or polyethylene is preferably used.

In order to obtain the purified water by separating the raw water by the immersion type purified water manufacturing method according to the present invention, as shown in FIG. 1, the reverse osmosis membrane separator 1 is submerged in a water depth to which a water pressure higher than the osmotic pressure is applied. When the hand valve 4 on the water surface of the communication pipe 5 is opened, the reverse osmosis membrane 1 in the pressure resistant container 1A of the reverse osmosis membrane separator 1 under the water depth is opened.
The permeated water that has permeated B is stored in the permeated water receiver 3. At the same time, the air contained in the permeated water receiver 3 is discharged to the atmosphere side through the communication pipe 5. Since the check valve 6 operates, the permeated water stored in the permeated water receiver 3 does not flow back from the permeated water receiver 3 to the reverse osmosis membrane separator 1. In order to generate a flow of raw water supply to the reverse osmosis membrane separator 1, remove dirt on the membrane surface of the reverse osmosis membrane 1B, and maintain the performance of the reverse osmosis membrane 1B, the raw water is separated during the separation. It is preferable to move the reverse osmosis membrane separator 1 vertically or horizontally. Specifically, support rope 1
This can be achieved by repeatedly pulling up 1 for about 2 m and then lowering the same length. Alternatively, if it is on board, it can be achieved by operating the ship. To collect permeated water, reverse osmosis membrane separator 1 and permeated water receiver 3
This is achieved by pulling up the support rope 11 connected to, for example, at least until the permeated water receiver 3 rises above the water surface. By the above operation, desired purified water can be obtained from the raw water 10.

[0017]

【Example】

[Embodiment 1] Next, the present invention will be described in more detail with reference to Embodiment 1. In FIG. 1, as raw water 10,
Water from Lake Biwa near Omihachiman City, Shiga Prefecture was used. As the reverse osmosis membrane 1B, a reverse osmosis membrane (NTR- manufactured by Nitto Denko Corporation) is used.
759HR-S2, membrane area 1.7 m ² ) was used as a spiral wound type membrane module, and one SUS316 shell manufactured by Nitto Denko KK was used as a pressure resistant container 1A. A 15A SUS316 ball valve was used as the hand valve 4, and a SUS316 lift type check valve was used as the check valve 6. A cylindrical 1 L container made of SUS316 was used as the permeated water receiver 3, and a polypropylene pressure-resistant tube having a diameter of 6 mm was used as the communication pipe 5. The water depth was about 50 m, and up and down movements of ± 2 m with respect to the water depth were performed 10 times per minute. After continuing for about 5 minutes, the set such as the reverse osmosis membrane separator 1 and the permeated water receiver 3 was pulled up to the surface of the water by using the support rope 11 made of polyethylene, and 1L
Permeate was collected. When the raw water 10 and the quality of the permeated water obtained by the above operation were analyzed, the permeated water was sufficiently satisfactory as purified water. Various measurement results are shown in Table 1.

[Table 1]

[0018]

EFFECTS OF THE INVENTION According to the present invention, since a manual pump is used by membrane separation of a reverse osmosis membrane from raw water such as river water, lake water, groundwater or seawater containing various organic substances and ions, it is possible to reduce electricity consumption. It is possible to safely and easily produce purified water that can be used for cleaning applications and beverage applications at any time without using an artificial power source. Further, since the treatment of the concentrated water on the non-permeate side can be used without controlling, the permeation performance and durability of the reverse osmosis membrane will not be deteriorated by neglecting the control.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a manual reverse osmosis membrane water purifier used in the present invention.

[Description of sign]

 1 Reverse Osmosis Membrane Separator 1A Pressure Resistant Container 1B Reverse Osmosis Membrane 3 Permeate Water Receiver 4 Hand Valve 5 Communication Tube 6 Check Valve 11 Support Rope

Claims (2)

[Claims] 1. A method for producing purified water in which raw water is supplied to a reverse osmosis membrane separator to separate concentrated water and permeated water in the reverse osmosis membrane to obtain purified water. Immersion characterized in that the permeated water is submerged in such a depth that the permeated water side of the reverse osmosis membrane separator communicates with the atmosphere, the permeated water is stored in the permeated water receiver, and then the permeated water is pulled up to the water surface to recover the permeated water Water purification method. 2. A lead-out path for leading out permeated water from the reverse osmosis membrane separator, a permeated water receiver arranged in the lead-out path, and between the reverse osmosis membrane separator and the permeated water receiver. A check valve arranged in the outlet passage, and a communication pipe for communicating the permeated water receiver with the atmosphere,
The immersion pipe water purification apparatus, wherein the communication pipe has a length such that the reverse osmosis membrane separator is submerged in a water depth to which a water pressure equal to or higher than an osmotic pressure is applied.