KR20180085209A - Water treatment method for removing algae in the water - Google Patents

Abstract

The present invention relates to a fluid treatment method capable of suppressing the formation of algal bloom and decomposing and removing algal bloom included in fluids by making the fluids go through an organic matter decomposing device. The organic matter decomposing device includes: a first metal layer made of metal containing copper; an insulating layer located on an inner wall of the first metal layer to be provided as a passage for the fluids, preventing contact between the fluids and the first metal layer, and having electric insulation; and a second metal layer made of zinc on at least one part of the inner wall of the insulating layer. As the fluids move the organic matter decomposing device, a reaction of a reaction formula (1), Zn + 2H_2O + O_2→ Zn(OH)_2+H_2O_2, is generated by an oxidation reducing reaction caused by the potential difference between the different metals of the first and second metal layers, and then, zinc ions and hydrogen peroxide, which are generated by the reaction, are used to decompose and remove algal bloom.

Description

TECHNICAL FIELD [0001] The present invention relates to a fluid treatment method for removing algae from water,

The present invention relates to a method capable of removing a green tide generated in a fluid, particularly fresh water, or inhibiting the occurrence of a green tide.

Due to the sudden industrialization, the increase of various pollutants and the continuous increase of pollutant loads in Korea has caused the polluted water outflows to be intensified, resulting in severe water pollution in the narrow land area along with the existing domestic sewage. Especially, as the water temperature increases, the greenery phenomenon occurs every year due to eutrophication from fresh water such as lakes and reservoirs, and the natural environment is suffering from the limit of the self-sufficiency ability.

The algae phenomenon is a phenomenon caused by the mass production of algae, that is, phytoplankton. Cyanobacteria, which cause dark green color in water, are the main cause of the algae phenomenon. These algal blooms usually occur intensively in the summer of June and July. Some of the algae that are formed contain toxins that cause destruction of ecosystems, such as dead fishes, resulting in loss of native animals and changes in population It can cause ecological changes. In addition, when the skin is exposed to the skin due to toxins such as cyanobacteria, it can cause health problems such as abdominal pain and headache, etc., such as human body and livestock. In addition, coloration and scum are formed, and visual discomfort caused by the death of fish and the like is also caused.

As described above, the green algae phenomenon causes many problems in terms of ecological and sanitary aspects as well as socioeconomic and visual problems, and requires water treatment for removing green algae.

Particularly, among the cyanobacteria, four species such as microcystis and anaabena need to discharge the odorous substances or blow out some weak toxins and treat them with high water. Such high-level water treatment requires ozone treatment together with activated carbon treatment. In the case of such a brief green tide period, high-level water purification treatment costs several hundred billion won.

Accordingly, there is a need for a greenhouse treatment method capable of preventing the occurrence of a greenhouse, preventing the occurrence of a greenhouse, and preventing and treating the greenhouse at a low cost.

The present invention relates to an economical and economical water-treatment system which does not cause ecosystem pollution and which exhibits rapid reactivity and efficiency, and is an eco-friendly water treatment method free from ecosystem contamination of secondary agglomerates. And a method for preventing the occurrence of a green tide.

The present invention relates to a fluid treatment method for passing a fluid through an organic matter decomposition device to decompose and remove green tones contained in a fluid and to inhibit the generation of a green tide. The fluid treatment method includes a first metal layer made of a copper- And a second metal layer formed on at least a portion of the inner wall surface of the insulating layer, wherein the second metal layer is provided on the wall surface and is provided as a passage through which the fluid passes, (1) by the oxidation-reduction reaction by the potential difference between the dissimilar metals of the first metal and the second metal through the organic material decomposing apparatus using the organic material decomposing apparatus including the metal layer Zinc ions and hydrogen peroxide are generated in the fluid, and the resulting greenhouse is decomposed and removed by the produced zinc ions and hydrogen peroxide Provides a fluid processing method.

Zn + 2H ₂ O + O ₂ → Zn (OH) ₂ + H ₂ O ₂ (1)

At this time, in the organic material processing apparatus, the first metal layer may be copper, brass, or an alloy of any one of Zn, Mn, Zr, Mg, Ti, and Al and copper in a weight ratio of 2: 8 to 3: have.

Meanwhile, the first metal layer may include a nickel plating layer on the outer surface.

The second metal layer may have a tubular shape with one channel through which the seawater passes or a tubular shape with two or more channels.

The insulating layer includes a space portion formed by separating the first metal layer and the second metal layer from each other by an insulator, and the space portion may be filled with air or maintained in a vacuum state.

Meanwhile, the insulating layer may be made of at least one material selected from the group consisting of polyethylene, polypropylene, and polytetrafluoroethylene.

The fluid is supplied to the organic decomposition apparatus by a pump to be discharged after the greenhouse in the fluid has been treated.

The fluid preferably passes through the flow path at a flow rate of 0.3 to 6 m / s.

According to the present invention, it is possible to obtain an excellent effect of removing green algae and removing bad smells, and by not using chemicals for algae removal, it is possible to remove green algae in a nature friendly manner without fear of secondary pollution due to use of chemicals, It has no effect at all.

In addition, according to the present invention, it is possible to prevent recurrence of the green tide by repeatedly treating the generated water with circulation.

Further, since it is not necessary to install a complicated facility for removing greenhouse, the present invention can reduce facility installation cost and space, and it is not necessary to supply an external power source for operation of the facility, thereby reducing operating expenses.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an apparatus for decomposing an organic material used in the method of the present invention. FIG.
2 schematically shows a cross section of an electrostatic processing apparatus for a conductive fluid according to the present invention, and schematically shows an example in which an insulator film is formed as an insulating layer between a first metal layer and a second metal layer.
Fig. 3 schematically shows a longitudinal section of an electrostatic processing apparatus for a conductive fluid according to the present invention, in which an air layer is formed as an insulating layer between a first metal layer and a second metal layer, As shown in Fig.
Fig. 4 is a photograph showing the result of greening removal according to Example 1 in a laboratory. Fig. 4 (a) shows an initial water tank, Fig. 4 (C) is a photograph of a water tank after curing for 4 days.
FIG. 5 is a graph showing changes in the concentrations of zinc ions and hydrogen peroxide in the water tank after 2 days and 4 days after treatment in the green algae removal according to Example 1. FIG.
6 is a graph showing the concentration of microorganisms remaining in the water tank before and after the treatment of Example 1. Fig.
FIGS. 7 and 8 are photographs showing water collected in a floating system in which algae removal was performed according to Example 2, in comparison with water (control) collected in a floating system not performing algae removal, Figure 8 is water after 10 days.
FIGS. 9 and 10 are graphs showing concentrations of zinc and hydrogen peroxide in water collected in the floating system of the floating system and the floating system of the greenhouse removed according to Example 2, to be.
FIG. 11 is a graph showing the concentration of microorganisms present in the water collected in the floating system of the floating system and the control system in which algae removal was performed according to Example 2, and the concentration of the microorganisms was changed with the passage of time.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

The present invention provides a fluid treatment method for passing a fluid through an organic matter decomposition device to decompose and remove a green tide contained in the fluid, and to suppress generation of a green tide.

In the present invention, the organic decomposition apparatus is a technique for decomposing and removing organic substances such as green algae present in a fluid by generating metal ions in the fluid by using the natural potential difference between dissimilar metals and by generating hydrogen peroxide in the fluid.

To this end, the organic material decomposing apparatus of the present invention comprises a first metal layer, an insulating layer and a second metal layer. Hereinafter, the organic material decomposing apparatus used in the present invention will be described in more detail with reference to FIG. 1 to FIG.

The first metal layer 101 is located outermost among the insulating layer 102 and the second metal layer 103 and is made of a metal containing copper and has a tubular shape. The first metal layer is not particularly limited as long as it is a metal containing copper, and may be pure copper as well as an alloy containing copper. Preferred copper-containing alloys may be brass, which is an alloy of copper and zinc.

The brass is not particularly limited and may be suitably used in the present invention as long as it contains zinc in a range of 20 to 40% by weight. Representative brasses include, but are not limited to, 40% by weight (quartz brass), 35% by weight, 33% by weight, 30% by weight (trillion brass) and 20% , And zinc containing not more than 20% of zinc can be used. More preferably, the smaller the zinc content, the greater the zinc ion elution amount depending on the natural potential difference.

Further, the first metal layer may be an alloy of copper and another metal. For example, the metal of any one of Zn, Mn, Zr, Mg, Ti and Al and copper may be an alloy having a weight ratio of 2: 8 to 3: 7, and these metals increase the magnitude of the potential difference, Of oxygen to produce hydroxyl groups, which can produce H ₂ O ₂ .

On the other hand, the first metal layer may be plated with nickel if necessary. When plating with nickel, the sense of beauty can be increased, and the quality of the product can be further improved.

In the organic material decomposing apparatus 100 of the present invention, the second metal layer 103 is formed by dissolving metal ions in the fluid by a potential difference with the first metal layer 101, and is capable of providing a natural potential difference with copper or brass But it is more preferable that the second metal layer is zinc.

It is preferable to use zinc because zinc does not affect the surrounding ecosystem even if it is eluted and exists in water. On the other hand, the zinc of the present invention is preferably produced by firing solid zinc in a vacuum chamber and cooling it at room temperature. Specifically, the solid zinc may be fired at a temperature of 400 to 800 ° C to melt the zinc, and then cooled to room temperature in the same vacuum chamber to produce a zinc block. In the case of such production, it is possible to inhibit the formation of zinc oxide due to the binding of oxygen present in the air, and the zinc ion elution amount due to the natural potential difference can be increased.

The second metal layer 103 may be formed to have the same shape as the inner wall surface of the first metal layer 101. At this time, the second metal layer 103 may be formed on the entire inner surface of the first metal layer 101, or may be partially formed. Increasing the friction with the fluid passing through the organic material decomposition apparatus 100 of the present invention can increase the amount of zinc elution from the second metal layer 103 in the fluid and is preferably formed to partially form a vortex in the fluid .

Meanwhile, the second metal layer 103 may be in the shape of a tube having one channel through which the fluid passes, and may have a shape of a tube having two or more channels as illustrated in FIG. Since the contact area with the fluid is large, it is possible to increase the amount of zinc ions eluted in the fluid, which is more preferable.

The first metal layer 101 and the second metal layer 103 are coupled by an insulating layer 102. The insulating layer 102 preferably electrically insulates the first metal layer 101 from the second metal layer 103. The first metal layer 101 and the second metal layer 103 are insulated by the insulating layer 102 so that electrons and zinc ions eluted from the second metal layer 103 due to a natural potential difference are introduced into the organic material decomposing apparatus 100 In the fluid passing therethrough. Therefore, it is preferable that the insulating layer 102 is installed to prevent the first metal layer 101 from being in contact with the fluid passing through the organic material decomposing apparatus 100 of the present invention.

The insulating layer 102 may be suitably used in the present invention as long as it provides insulation between the first metal layer 101 and the second metal layer 103. For example, plastic, ceramic, fluorine rubber or other non-conductive material having non-conductive properties may be used, and preferably, it may be plastic. Further, the insulating layer 102 may preferably be at least one selected from the group consisting of polyethylene, polypropylene, and polytetrafluoroethylene, and most preferably, is excellent in workability, is excellent in insulation, It is preferable that the polytetrafluoroethylene is excellent in the mirror-like property.

The insulating layer 102 may be a coating layer coated on the inner wall surface of the tube of the first metal layer 101 and may be formed by laminating films made of the insulating material. 3, the insulating layer 102 of the present invention is formed by forming a structure of a first metal layer 101 and a second metal layer 103 with an insulating material and assembling the first metal layer 101 into the first metal layer 101 .

At this time, as shown in FIG. 3, a predetermined space may be formed between the structure made of the insulating material and the first metal layer 101, and an air space filled with air may be included. At this time, the air acts as an insulating material, and the insulating effect between the first metal layer 101 and the second metal layer 103 or the fluid may be achieved. It is preferable that the second metal layer is formed entirely inside the first metal layer so that the fluid does not contact the first metal layer.

The second metal layer 103 is formed by a potential difference between the copper of the first metal layer 101 and the dissimilar metal of the zinc of the second metal layer 103, (1). ≪ / RTI >

Zn + 2H ₂ O + O ₂ → Zn (OH) ₂ + H ₂ O ₂ (1)

That is, zinc is eluted from the second metal layer 103 made of zinc to provide electrons, and zinc ions are supplied to the water. This reaction is an oxidation-reduction reaction which is caused by a natural potential difference without an external power source, and an oxidation or reduction reaction is carried out by the transfer of electrons.

The zinc ions generated by the oxidation generate hydrogen peroxide as shown in the formula (1) through the reaction process with water and oxygen as shown in the following formula (2), and the hydrogen peroxide generated thereby decomposes and precipitates the organic matters in the water .

H ₂ O + 2e ^- ? H ⁺ + 2OH ^- ????? (2)

Thus, it is possible to remove the green tide generated in the water. As a result, water having passed through the organic matter decomposition apparatus of the present invention and having the green algae removed is discharged.

The water treated by the above-described method is discharged after being treated through the organic material treatment apparatus, and is re-supplied. By continuously and repeatedly performing the fluid treatment according to this process, it is possible to reduce the concentration of green algae in the water, It is possible to prevent the re-generation of green tide. Therefore, the fluid treatment method of the present invention is more preferable for treating water stagnant at a specific position such as a lake, for example, a pond installed in a lake, a golf course, a farm, and the like.

Accordingly, the fluid to be treated may be supplied to the organic material decomposing apparatus through a pump. In this case, the fluid passing through the organic material decomposing apparatus may be supplied with a fluid at a flow rate of 0.3 to 6 m / s desirable.

Example

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the following Examples.

Example  One

1. Manufacture of organic decomposition apparatus

A brass pipe made of a brass material was mounted as a first metal layer 101 inside the housing 105 of the stainless steel material and polytetrafluoroethylene (PTFE) was coated as an insulating layer 102 on the entire inner wall surface of the brass pipe . In addition, a second metal layer 103 was formed by inserting a tube-shaped submerged tube having six channels in the brass tube.

Thereby, the organic material decomposing apparatus 100 as shown in Figs. 1 to 3 was prepared, and the metal pipe 106 was connected to both ends.

2L and 5L of water were collected from a pond in which green algae were generated and placed in an experimental water tank. Water was supplied from the water tank into the prepared organic matter decomposition apparatus to remove green algae contained in the water, The circulation process was continuously carried out.

At this time, the circulation of water due to the supply and discharge of water from the water tank to the organic decomposition apparatus was performed using a manual pump, and the flow rate was 0.75 m / s.

Water was taken in the water tank 2 days and 4 days after the start of the water treatment, and the results are shown in FIG.

The water turbidity, zinc ion concentration, hydrogen peroxide concentration and microbial concentration of the water in the water tank at this time were measured. The results are shown in the following Table 1 and shown in the graphs of FIG. 5 and FIG.

Early 2 days 4 days Turbidity (NTU) 31.0 6.25 3.79 Zn (mg / L) 0 0.34 0.46 H ₂ O ₂ (mg / L) 0 0.05 0.08 Microbes (CFU / ml) 790 - 59

As can be seen from the above Table 1, when treated according to the method of the present invention, the turbidity of water in the water tank was remarkably improved with time, and the number of microorganisms existing in the water tank after the final treatment remarkably decreased .

At this time, zinc ions and hydrogen peroxide which were not present in the water were detected in the water. It can be seen that the zinc was eluted into water from the organic matter decomposition apparatus by the treatment according to the method of the present invention, and thus hydrogen peroxide was generated.

On the other hand, it is analyzed that organic matter in the water tank is decomposed by the hydrogen peroxide.

Further, the concentration of zinc present in the treated water is 0.46 mg / L, which indicates that the condition of the zinc concentration of 3 mg / L or less, which is presented in the 2009 water quality standard of the Ministry of Environment, is satisfied.

Example 2

A floating system in which water is stored in a pond in which green algae occur is installed. In the floating system, an organic decomposition apparatus (progressive scale burst of progressive waterway,? 20) similar to that of Example 1 was installed.

Water was supplied to both sides of the organic matter decomposition apparatus and water was supplied to the organic matter decomposition apparatus by connecting a pump to the inlet piping side.

7 days and 10 days after the water treatment The water in the floating system was taken and photographed, and the results are shown in FIGS. 7 and 8. FIG. At this time, the water in the floating system not including the organic material decomposing apparatus is also photographed and shown for comparison.

As can be seen from Figs. 7 and 8, it can be confirmed that the water-treated water becomes clear after 7 days, compared with the water of the control group, and after 10 days, the water is markedly purified to be transparent.

On the other hand, turbidity, zinc ion concentration, hydrogen peroxide concentration, and microorganism concentration were measured for water after 7 days and 10 days of the water treatment taken in the same manner as in Example 1. The results are shown in Table 2 and Figs. . However, the microbial concentration was measured only after 10 days.

Control group Example 2 Early 7 days 10 days Early 7 days 10 days Turbidity (NTU) 15.0 16.5 15.5 16.0 4.5 0.5 Zn (mg / L) N.D. N.D. N.D. N.D. 0.86 0.95 H ₂ O ₂ (mg / L) N.D. 0.001 N.D. N.D. 0.08 0.09 Microbes (CFU / ml) 300 - 3300 300 - 7

As can be seen from Table 2 and Figures 9 to 11, the number of microorganisms in the control group was significantly increased.

However, in the case of Example 2 in which the water treatment was carried out according to the method of the present invention, the number of microorganisms was significantly reduced. At this time, zinc ions were detected in water and hydrogen peroxide was also detected. From these, microorganisms were decomposed and removed by hydrogen peroxide, and it was judged that the hydrogen peroxide was generated by the zinc ions eluted from the organic matter decomposition apparatus.

From the results of Examples 1 and 2, it can be seen that when the water treatment is performed through the organic material decomposition apparatus according to the present invention, algae generated in the water can be removed to improve water quality, . Furthermore, it can be seen that it is an effective method not causing secondary pollution due to excessive heavy metal concentration in water.

100: Organic decomposition apparatus 101: First metal layer
102: insulating layer 103: second metal layer
105: housing 106, 106 ': metal piping

Claims (8)

A fluid treatment method for passing a fluid through an organic matter decomposition device to decompose and remove green tones contained in the fluid and inhibit the generation of a green tide,
A first metal layer of a copper-containing metal;
An insulating layer disposed on an inner wall surface of the first metal layer and provided as a flow path through which the fluid flows, the electrical insulating layer interrupting the contact between the fluid and the first metal layer; And
And a second metal layer made of zinc and formed on at least a part of the inner wall surface of the insulating layer,
(1) by the redox reaction by the potential difference between the dissimilar metals of the first metal and the second metal,
Zn + 2H ₂ O + O ₂ → Zn (OH) ₂ + H ₂ O ₂ (1)
And the green tide is decomposed and removed by the zinc ions and the hydrogen peroxide produced thereby.
2. The method of claim 1, wherein the first metal layer is selected from the group consisting of pure copper, brass, or a fluid of any one of Zn, Mn, Zr, Mg, Ti, and Al and an alloy of copper having a weight ratio of 2: 8 to 3: Processing method.
3. The method of claim 2, wherein the first metal layer comprises a nickel plated layer on an outer surface.
The method of claim 1, wherein the second metal layer has a tubular shape with one channel through which the seawater passes, or a tubular shape with two or more channels.
The fluid treatment method according to claim 1, wherein the insulating layer includes a space portion formed by a first metal layer and a second metal layer separated by an insulator, and the space portion is filled with air or held in a vacuum state.
The fluid treatment method according to claim 1, wherein the insulating layer is at least one selected from the group consisting of polyethylene, polypropylene, and polytetrafluoroethylene.
The fluid treatment method according to claim 1, wherein the fluid is supplied to the organic decomposition device by a pump, and the green tide in the fluid is treated and then discharged.
The fluid treatment method according to claim 1, wherein the fluid flows through the flow path at a flow rate of 0.3 to 6 m / s.

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