JP3552773B2 - How to purify closed water - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method for purifying a closed water area, and more particularly to a method for purifying a closed water area in which eutrophic ponds / lake water in a closed water area is purified by a combined apparatus of a catalytic oxidation device and an antibacterial fluidized bed.
[0002]
[Prior art and its problems]
Conventionally, methods of purifying closed water areas such as ponds and lakes include ozone oxidation, ultraviolet sterilization, mechanical filtration, and a coagulant addition method. The maintenance cost is expensive, and the mechanical filtration method has problems of high construction equipment cost and measures for backwash water generated when the clogging of the device is cleaned. The agent addition method has problems such as generation of a large amount of sludge, an increase in drug cost, and adverse effects on animals and plants.
[0003]
[Means for Solving the Problems]
The present invention is to solve the above problems, the gist of which is that BOD, SS, raw water of a closed water area containing algae, etc., a catalytic oxidizer in a preceding stage, a fluidized bed loaded with an antibacterial material in a subsequent stage. a method for purifying at any combination of the purification system, the catalytic oxidation device is gravity flow of the raw water introduced into and B0D by biofilm on filler loaded in the apparatus, SS, to remove algae, then this Closing characterized by introducing primary treatment water into a fluidized bed and bringing the zeolite charged in the fluidized bed into fluid contact with an antibacterial material comprising an inorganic antibacterial agent carrying Ag ions, Cu ions, etc., and performing an antibacterial treatment. Water purification method.
[0004]
The present invention is a purification treatment system in which a catalytic oxidation device and an antimicrobial agent fluidized bed are combined. In the catalytic oxidation device, raw water such as a pond or lake water to be purified is placed in a bypass channel incorporating a filler. And contacting the introduced water with a biofilm (a film composed of bacteria, protozoa, metazoans, etc.) formed on the filler, and a source of BOD (amount of organic substances subject to oxidative decomposition) in the water, This is a biochemical purification treatment of SS (suspended matter), turbidity components (phytoplankton, etc.), algae, and the like.
[0005]
The primary treated water is subsequently introduced into a fluidized bed loaded with the antibacterial material and brought into fluid contact with the antibacterial material. In this fluidized bed, fine particles not adsorbed and separated in the preceding contact oxidation step are used. The algae are prevented from growing without losing activity upon contact with the antibacterial agent in the antibacterial material, and the final treated water is returned to the original water system as treated water having no ability to grow microorganisms.
[0006]
【Example】
Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a partially omitted perspective view showing an embodiment of the present invention.
As shown in a perspective view in FIG. 1, the catalytic oxidizing apparatus 1 used in the preceding catalytic oxidation step in the present invention forms a detour channel 12 by partitioning the inside of a tank 11 by a partition plate 13, Is filled with a filler 14. The filler 14 may be in any form such as a corrugated parallel plate type, a string shape, a crushed stone shape, a cylindrical shape, and a net shape.
Raw water A is introduced into the catalytic oxidizer 1 from the closed water area (not shown) in the direction of the arrow, and the introduced raw water A is applied to the biofilm on the filler 14 loaded in the bypass channel 12 of the catalytic oxidizer 1. While being in contact with each other, the water naturally flows down in the direction of the arrow due to the difference in water level. During this time, the BOD, SS, algae, and the like in the raw water A are removed to become the primary treated water B.
[0007]
Next, the primary treatment water B treated in the contact oxidation step in the preceding stage is introduced into the fluidized bed 2 loaded with the antibacterial material 21 in the subsequent stage, and is brought into fluid contact with the antibacterial material 21 to perform antibacterial treatment.
This antibacterial material 21 is a mixture of zeolite and an inorganic antibacterial agent carrying Ag ions, Cu ions, or the like, and has a spherical shape of about 0.5 to 10 mmφ, a length of 0.5 to 10 mmφ, and a length of 0.5 to 10 mmφ. A columnar shape of about 1 to 10 mm is preferably used.
The secondary treated water treated by the antibacterial material 21, ie, the purified water C, is returned to the original closed water area, and the closed water area can be purified by continuously repeating the contact oxidation treatment and the antibacterial treatment.
[0008]
【The invention's effect】
Since the present invention has the above configuration, the following effects can be obtained.
That is, according to the present invention, the BOD source and algae are removed and separated by the contact oxidizer at the former stage, and the treated water having no microbial growth ability is formed by the antibacterial action of the antibacterial material in the fluidized bed at the latter stage. The growth of microorganisms and the like in the water area is suppressed, the water is prevented from being polluted, and the water is purified for a long time. Since the present invention is basically a natural flow method, no large-scale mechanical equipment is required. It is a purification method that is low in construction cost and maintenance cost.
[Brief description of the drawings]
FIG. 1 is a partially omitted perspective view showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Contact oxidation apparatus 11 Tank 12 Detour channel 13 Divider 14 Filler 2 Fluidized bed 21 Antibacterial material A Raw water B Primary treated water C Secondary treated water (purified water)

Claims (1)

A method for purifying raw water in a closed water area including B0D, SS, algae, etc. by a purification system in which a catalytic oxidizer is provided in a preceding stage and a fluidized bed loaded with an antibacterial material is provided in a subsequent stage, and is introduced into the catalytic oxidizing device. B0D by the raw water by gravity flow biofilm on filler loaded in the apparatus, SS, to remove algae and then the zeolite was loaded into the fluidized bed by introducing the primary treated water into the fluidized bed A method for purifying a closed water area, comprising subjecting an antibacterial material composed of an inorganic antibacterial agent carrying Ag ions, Cu ions, or the like to flow contact and carrying out antibacterial treatment.

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