JPS60885A - Method and device for decomposing and removing trace organic compound in city water - Google Patents

Abstract

PURPOSE:To decompose and remove efficiently trace org. compd. with a simple installation by pressurizing city water contg. the trace org. compd. with prescribed pressurizing force then injecting said water into the surface of a paramagnetic material on which a negative DC high voltage is impressed. CONSTITUTION:When the city water which contains trace org. compd. and is adequately pressurized is admitted through an inflow pipe 1, the water is conducted through a circular pipe 2 and a distributing pipe 3 to a pressure chamber 4. The city water conducted therein is simultaneously injected from many injecting nozzles 6 provided to a cylinder 6 toward a paramagnetic material 8 on which a negative DC high voltage is impressed. The water falls by gravity and is taken to the outside by passing through an outflow pipe 9. A trace of org. compd. in the city water loses the intrinsic characteristic during this time and the trace of org. compd. in the city water is decomposed and removed. The high voltage of DC is not conducted in the water in the above-described method and therefore the electric power consumption is extremely minimized, the need for manpower is eliminated and the maintenance and control are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for decomposing and removing trihalomethanes, which are harmful to the human body, and musty-smelling substances that cause discomfort to people, which are slightly contained in tap water, and an apparatus therefor. This is related. The above-mentioned substances were not contained in conventional tap water, but with rapid economic growth, water supply raw water has been affected by runoff from land development, industrial wastewater, etc. As a result, the quality of the water has deteriorated significantly, and while conventional water purification methods can satisfy the drinking water quality standards set by the Ministry of Health and Welfare, they are no longer able to deal with newly emerging substances. In addition, the amount of chlorine used for disinfection in the final stage of the water purification process also increases in proportion to the deterioration of water quality, and humic substances contained in raw water that cannot be removed by conventional water purification methods act on this. It is said to cause a chemical change to produce trihalomethane. In addition, it is said that mold odor is caused by the progress of eutrophication of tap water source areas, which contain odor components produced by microbial metabolites.

Trihalomethane removal methods generally include boiling, ozone oxidation, and activated carbon adsorption. However, this method requires a large amount of money for a 1-1 ton facility to treat a large amount of tap water, and the maintenance costs are also high. In addition, activated carbon filtration is commonly used for deodorization, but this also requires additional construction work on civil engineering structures and other facilities and manpower for maintenance and management, which is expensive.

The present invention was made in view of the conventional drawbacks,
The purpose is to provide a method for decomposing and removing trace amounts of organic compounds in tap water, which minimizes the size of the water treatment plant site required for additional equipment, and requires less manpower and expense for maintenance, as well as an apparatus for the same.

Next, the processing method of the present invention will be explained.

It is known that when an electric field is applied to a dielectric, the centers of positive and negative charges in molecules within the dielectric move in opposite directions. In the present invention, a negative DC high voltage is applied to the paraelectric material 8, and as a result, a dielectric charge with a positive sign opposite to that of the electrode charge is generated on the surface of the paraelectric material 8. Next, clean water containing a trace amount of organic compounds is injected onto the surface of the paraelectric material 8, which has a positive dielectric charge. It has been found that compounds are decomposed by positive dielectric charges. This method was invented based on this knowledge.

Next, one embodiment of the apparatus of the present invention will be described with reference to the accompanying drawings.

First, as for the structure, the upper plate 15 lower plate 16 outer cylinder 17 inner cylinder 5, two gaskets 11, and two cylindrical gaskets 12 are assembled and tightened with eight bolts and nuts. In this case, a portion surrounded by the outer cylinder 17, the inner cylinder 5, the upper plate 15, and the lower plate 16 becomes the pressure chamber 4. This is fixed to the floor or the like using supporting hardware 14. The distribution pipe 8 is welded and fixed to the outer cylinder 17. Next, attach the circular pipe 2, the inflow pipe 1, and the outflow pipe 9. Next, the negative DC high pressure generator 7 is added via the °'0' ring 10 as shown in the figure. The power source and the negative DC high voltage generator 7 are connected by a conduit 18 . Of course, it is added to the lower part of the paraelectric GTI negative DC high voltage generator 7.

Further, a ventilation hole 13 is opened in the upper panel 15.

Next, as for the action, when appropriately pressurized tap water containing a trace amount of organic compounds is sent through the inflow pipe 1, it flows into the circular pipe 2.
It is led to the pressure chamber 4 via the distribution pipe 8. The guided clean water is injected from many injection nozzles 6 provided in the inner cylinder 5 toward the paraelectric material 8 to which negative DC high pressure is applied all at once, and after falling due to gravity, it passes through the outflow pipe 9. It can be taken out to the outside. During this time, trace organic compounds in tap water lose their inherent properties.

In other words, trace amounts of organic compounds in tap water have been decomposed and removed.

The effects of this invention are considered to be due to the unique lighting of this device and the electrochemical treatment method, unlike conventional methods such as boiling, ozone oxidation, and use of activated carbon. In addition, since high voltage DC is not applied, power consumption is extremely low, maintenance is easy without the need for manpower, and the amount of land required for additional equipment is smaller than with other treatment methods.

The following are the results of an experiment using the apparatus shown in one example, limited to chloroform, which is said to be contained in the largest amount in clean water.

Untreated water Treated water Chloroform 170 α4 (PPB)

[Brief explanation of drawings]

81 is a plan view of a device showing a specific example of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, 4f1 pressure chamber, 6 an injection nozzle,
7 is a negative DC high voltage generator, 8 is a paraelectric material, 13t-i
Air vent. Procedural Amendment April 120, 1980 1 Indication of Case Patent Application No. 110427 of 1982 2
Title of the invention Method for decomposing and removing trace organic compounds in tap water and its device 3 Relationship with the case of the person making the amendment Patent applicant address (residence) 4-26-13 Shinmori, Asahi-ku, Osaka-shi, Osaka Prefecture Order for amendment Date Spontaneity 5 Subject of amendment Claims, detailed description of the invention,
Attachment 2, Claim 1 In a method for decomposing and removing undesirable trace organic compounds contained in clean water, the clean water containing trace organic compounds is appropriately pressurized, and this is transferred to a dielectric to which negative DC high voltage is applied. A method for decomposing and removing trace organic compounds in clean water, the method comprising decomposing and removing trace organic compounds contained therein by spraying onto the surface of a body (8). 2 Install the cylinder (5) inside the outer cylinder mouth η and connect them to the upper plate (
1!9 Tighten using the lower plate OQ and backing, attach many injection nozzles (6) to the cylinder (5) facing inward, and insert the dielectric (8) into the cylinder (5) through the upper plate DI. Suspended inside, from the injection nozzle (6) to the surface of the dielectric (8),
An apparatus for decomposing and removing trace organic compounds in clean water, characterized in that the clean water is injected. For a detailed description of the invention, see page 3, line 17, page 4, line 20, page 4, line 18, and page 5.
Correct "paraelectric 8" on the 6th line of the page to "dielectric 8". For a brief explanation of the drawings, please refer to "paraelectric material" on page 6, line 7, and page 8, line 8.
Correct to "dielectric".

Claims (1)

[Claims] 1. In a method for decomposing and removing undesirable trace organic compounds contained in clean water, the clean water containing trace organic compounds is pressurized to an appropriate level, and then this is heated to Spray LL on the surface of the body (8)! A method for decomposing and removing trace organic compounds in clean water, the method comprising decomposing and removing trace organic compounds contained in water. 2 Install the cylinder (5) inside the outer cylinder α, and connect them to the upper plate α.
Q lower plate 0 → and tighten using backing, cylinder (5
) with a large number of injection nozzles (6) facing inward, a paraelectric material (8) is suspended inside the cylinder (5) through the α valley of the upper plate, and the paraelectric material (8) is injected from the injection nozzle (6). ) on the surface of
An apparatus for decomposing and removing trace organic compounds in clean water, characterized in that the clean water is injected.