JP2015059309A - Pollution prevention method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pollution prevention method which can enhance efficiency of pollution purification by suppressing dilution of a coagulant.SOLUTION: A plurality of pollution prevention membranes 40 are installed within a water area such as a river so as to traverse from one bank 27 to the other bank 29. The pollution prevention membranes 40 are installed in such a manner that each of them is partly opened at an upstream 23 side or at a downstream 25 side and that slender flow channels 41, 43 returning back and making one reciprocation between the bank 27 and the other bank 29 are formed. Air bubbles and a solution containing a coagulant are blown out into water in the upstream side flow channel 41. In the flow channel 41, a convection is generated in the water by the bubbles blown out and the coagulant is dispersed in the water by the convection. Since the dispersion is retained within a slender region in the slender flow channels 41, 43, dilution of the coagulant is suppressed. Thus, polluted matters in the water are efficiently coagulated. In the flow channel 43 and a downstream 25 without blowing out of air bubbles, the coagulated polluted matters are precipitated on a water bottom and water containing the polluted matters is purified.

Description

  The present invention relates to a pollution prevention method, and more particularly, to a technique for purifying pollution in water using a flocculant and bubbles.

  Conventionally, a technique disclosed in Patent Document 1 is known as this type of pollution prevention method. The prior art disclosed in Patent Document 1 spouts a flocculant and bubbles near the lower end of a pollution prevention film (also referred to as “fouling prevention curtain” in this technical field) that extends down from the water surface to the water. By doing so, convection is formed and it is intended to efficiently remove water pollution. However, when this technique is carried out in a large water area, there is a problem that it may take time to obtain a pollution prevention effect because the flocculant diffuses widely in the water and is diluted. It was.

Japanese Patent No. 4774112

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a pollution prevention method that increases the efficiency of pollution cleaning by suppressing the dilution of the flocculant.

  In order to solve the above-mentioned problems and achieve the above-mentioned object, the first aspect of the present invention is a pollution prevention method, and a plurality of methods are provided so as to cross from one bank to the other bank in a flowing water area. In order to form an elongate channel from at least one side to the other side between the one bank and the other bank so that a part of the anti-pollution membrane is opened on each of the upstream side and the downstream side. And providing for installation. The method further includes ejecting the solution into water by supplying a solution containing an aggregating agent over at least a partial section from the upstream side of the flow path, and over the at least a partial section of the flow path. Supplying the gas into the water in the form of bubbles.

  According to this configuration, the plurality of anti-contamination films installed in the water area so as to cross from the one bank to the other bank form an elongated flow path extending from at least one of the both banks to the other. The water in the water area flows from upstream to downstream by passing through this flow path. From the upstream side of the elongated channel, a gas and a solution containing a flocculant are ejected into water over at least a part of the section. For this reason, in the said area, a convection arises in water with the gas spouted in bubble shape, and the flocculent diffuses in water by the said convection. Diffusion remains in the elongate channel, so that dilution of the flocculant is suppressed. The diffused flocculant causes the pollutants in the water to clump. As a result, the aggregated pollutant settles on the bottom of the water within the flow path without bubbles ejected after passing through the section or downstream after passing through the flow path, and the water containing the pollution is purified. In this way, in the elongated channel which is a limited region, the aggregation of the pollutant progresses while suppressing the dilution of the flocculant, thereby improving the efficiency of the pollution cleaning.

  According to the second aspect of the present invention, there is provided a pollution prevention method, wherein a plurality of pollution prevention films are divided in a water area so as to cross from one bank to the other bank, and the one water area side and the other water area are separated. Each of the two sides is provided with an opening, and an elongated channel extending from at least one side to the other side is formed between the one bank and the other bank. The method further includes forming a flow of water from the one water area to the other water area, and supplying a solution containing a flocculant from at least a partial section from the upstream side of the flow path. Spraying into water, and supplying the gas over the at least part of the flow path to cause the gas to be ejected into water in the form of bubbles.

  According to this configuration, similarly to the pollution prevention method according to the first aspect, installation of the plurality of pollution prevention films in the water area, ejection of the solution containing the flocculant into the water, and ejection of the gas are performed. In addition, since a flow of water from one water area to the other water area divided by a plurality of anti-pollution membranes is formed, this structure can be used even in a non-flowing water area or a very gentle water area such as a reservoir. The same effect as the pollution prevention method according to the first aspect can be obtained.

  According to a third aspect of the present invention, there is provided a pollution prevention method according to the second aspect, wherein the one water area is transported from the other water area to the one water area without passing through the flow path. The water flow toward the other water area is formed.

  According to this configuration, by transporting water from the other water area to the one water area, a flow of water from the one water area to the other water area is formed. The water in the other water area is returned to the one water area and further passes through the flow path. Thus, since the water in the water area cyclically passes through the flow path, the purification of the water in the water area efficiently proceeds even when the flow path is short.

  According to a fourth aspect of the present invention, there is provided a pollution prevention method according to any one of the first to third aspects, wherein the plurality of pollution prevention films are between the one bank and the other bank, It is installed so as to form an elongate flow path that oscillates once or reciprocally by folding back once or more.

  According to this configuration, even if the distance between the two banks is the same, a long flow path that suppresses the diffusion of the flocculant is ensured, so that the efficiency of pollution cleaning is improved.

  According to a fifth aspect of the present invention, there is provided a pollution prevention method according to any one of the first to fourth aspects, wherein a solution containing a flocculant is limited to a partial section from the upstream side of the flow path. By supplying, the solution is jetted into water, and by supplying gas only to the partial section of the flow path, the gas is jetted into water into bubbles.

  According to this configuration, the gas and the solution containing the flocculant are ejected into the water only in a partial section from the upstream side of the elongated channel. For this reason, the aggregated pollutant settles on the bottom of the water in the flow path without bubbles ejected after passing through a part of the section, and the purification of the water containing the pollution proceeds. Since the settled pollutant is likely to concentrate in a certain area, it is easy to finally remove the pollutant with a soot or the like.

  As described above, according to the present invention, a pollution prevention method that improves the efficiency of pollution cleaning by suppressing the dilution of the flocculant is realized.

It is a perspective view which shows an example of the pollution prevention film | membrane used for the pollution prevention method by one embodiment of this invention. It is a side view which shows an example of the pollution prevention film | membrane of FIG. It is a schematic explanatory drawing which shows the pollution prevention method by one embodiment of this invention, and has shown the mode of implementation seen from the sky of the target water area. It is a schematic explanatory drawing which shows the pollution prevention method by one embodiment of this invention, and has shown the mode of implementation in water of a target water area. It is a schematic explanatory drawing which shows the pollution prevention method by another embodiment of this invention, and has shown the mode of implementation seen from the sky of the target water area.

  FIG. 1 is a perspective view showing an example of a pollution prevention film used in a pollution prevention method according to an embodiment of the present invention. FIG. 2 is a side view of the pollution control film. The pollution prevention film 101 has a gas pipe 9 and a solution pipe 13 installed along the vicinity of the lower end of a known pollution prevention film. That is, the pollution prevention film 101 includes a float 1, a film body 3 having an upper end connected to the float 1, and a heavy weight attached along the lower end of the film body to suspend the film body 3 in water. (Weight) 5, weight attachment member 7 for attaching the weight 5 to the lower end portion of the film body 3, gas pipe 9, gas pipe attachment member 17 for attaching the gas pipe 9 to the lower end portion of the film body 3, solution pipe 13, and solution A solution pipe attachment member 19 for attaching the pipe 13 to the lower end of the film body 3 is provided.

  The float 1 is a member that holds the upper end portion of the pollution prevention film 101 on the water surface 21 by buoyancy. A load is applied to the lower end portion of the film body 3 by the weight 5. Thereby, the film body 3 is held so as to hang from the water surface 21 to the water 20. 1 and 2, the weight 5 is a chain made of metal such as iron.

  In the gas pipe 9, a row of jet ports 11 is formed on the side wall. Air is supplied to the gas pipe 9. Thereby, the bubbles 31 are ejected into the water 20 from the rows of the ejection ports 11. Similarly, the solution pipe 13 has a row of jet nozzles 15 formed on the side wall. A solution 32 containing a flocculant is supplied to the solution pipe 13. The supplied solution 32 is ejected from the row of the ejection ports 15 into the water 20. The aggregating agent is an agent for aggregating and precipitating pollutants in the water 20, and various types are well known. Convection is formed in the water 20 by the bubbles ejected from the rows of the ejection holes 11. The flocculant contained in the solution 32 ejected from the row of the ejection ports 15 is diffused into the water 20 by this convection. In order to enhance the diffusion effect of the flocculant due to bubbles, the solution pipe 13 is preferably disposed above the gas pipe 9 as illustrated in FIGS. 1 and 2.

  FIG. 3 is a schematic explanatory view showing a pollution prevention method according to an embodiment of the present invention, and shows a state of implementation viewed from above the target water area. Moreover, FIG. 4 has shown the mode of implementation in the water of a target water area about the pollution prevention method by the embodiment. In this example, the water area to be subjected to the pollution prevention method is a water area with a flow of water such as a river. In the example of FIG.3 and FIG.4, the three pollution prevention films | membranes 40 are installed so that it may cross from the one bank 27 to the other bank 29 in a target water area. These pollution prevention films 40 are installed so as to form an opening 45 on the upstream 23 side divided by the pollution prevention curtain 40 and to form an opening 47 on the downstream 25 side. The pollution prevention film 40 further forms an elongated channel 41 extending from the one bank 27 to the other bank 29 and an elongated channel 43 communicating with the other bank 29 from the other bank 29 to the one bank 27. Installed. That is, the elongate flow paths 41 and 43 of the water flowing from the upstream 23 side to the downstream 25 side cross between the one shore 27 and the other shore 29, and are folded back and back once. It is formed by three anti-contamination films 40 juxtaposed to each other.

  In the example of FIGS. 3 and 4, the pollution prevention film 101 shown in FIGS. 1 and 2 is used for the pollution prevention film 40 arranged on the most upstream side. Thereby, the bubbles 31 and the solution 32 are ejected into the water 20 in the flow path 41. In the channel 41, the flocculant contained in the solution 32 is diffused by convection formed by the bubbles 31. The water flow that has passed through the flow path 41 subsequently passes through the flow path 43. Since the width of the flow paths 41 and 43 is much smaller than the width of the target water area, that is, the distance between the one bank 27 and the other bank 29, dilution of the flocculant is suppressed. That is, the flocculant passes through the channels 41 and 43 while maintaining a relatively high concentration. As a result, in the flow paths 41 and 43, the aggregation of the pollutant by the flocculant proceeds efficiently.

  The polluted material aggregated in the flocculant settles on the bottom of the water mainly in the flow path 43 where the bubbles 31 are not ejected and there is no convection or is weakened. In this way, the pollutant contained in the upstream 23 is purified, and the purified water flows through the downstream 25. The presence of the flow path 43 without the ejection of the bubbles 31 makes it easy for the settled contaminants to concentrate in a relatively narrow region, so that the final removal of the contaminants by soot or the like is facilitated.

  FIG. 5 is a schematic explanatory view showing a pollution prevention method according to another embodiment of the present invention, and shows a state of implementation viewed from above the target water area. In this example, the water area to be subjected to the pollution prevention method is a water area where there is no water flow or a very gentle flow like a reservoir. Also in the example of FIG. 5, as in the examples of FIGS. 3 and 4, the three antifouling films 40 are installed in the target water area so as to cross from the one bank 27 to the other bank 29. In order to form a flow of water from one water area 53 to the other water area 55 divided by these pollution prevention films 40, water is transported from the other water area 55 to the one water area 53 using the pipe 61. In order to enable transportation, for example, a pump 63 having power is inserted in the pipe 61. As a result, as in the example of FIGS. 3 and 4, efficient removal of the pollutant is realized.

  Further, in the example of FIG. 5, the water returned from the other water area 55 to the one water area 53 passes through the flow paths 41 and 43 again. That is, the water in the water area passes through the flow paths 41 and 43 in a circulating manner. For this reason, even if the flow paths 41 and 43 are short, the water in the water area is efficiently cleaned.

  FIG. 4 shows an example in which the air pipe 9 and the solution pipe 13 are attached to the film body 3 of the pollution prevention film 40. Instead of this, the air pipe 9 and the solution pipe 13 may be disposed, for example, in the bottom 50 of the channel 41 or in water. Since the air pipe 9 generates buoyancy, it is desirable to hold the air pipe 9 by using a weight to counter the buoyancy.

  FIG. 4 shows an example in which the lower end of the film body 30 of the pollution prevention film 40 reaches the water bottom 50. On the other hand, the lower end of the film body 30 may be in water separated from the water bottom 50. Even in this case, efficient removal of the pollutant is appropriately realized according to the distance between the lower end of the film body 30 and the water bottom 50.

  3 to 5 show an example in which three reciprocating flow paths 41 and 43 that are folded once are formed by three pollution prevention curtains 40. On the other hand, for example, it is possible to form a meandering flow path of one reciprocal half that is folded twice by four anti-pollution curtains 40. Furthermore, it is also possible to form a meandering flow path that is folded back further. Alternatively, for example, by using two anti-pollution curtains 40, it is possible to form a one-way flow path from the one bank 27 to the other bank 29 without being folded back.

  By ejecting the solution 32 and the bubbles 31 over a certain section from the upstream side in the formed flow path, efficient removal of the pollutant is realized. In the formed flow path, following the section in which the bubbles 31 are ejected, the section in which the bubbles 31 are not ejected follows, so that it is possible to concentrate the settled contaminants in a relatively narrow region. .

  It is also possible to eject the solution 32 and the bubbles 31 over the entire section of the flow path. In this case, the aggregated pollutant settles mainly in the downstream 25.

  In the pollution prevention method illustrated in FIG. 5, it is possible to form a flow of water from one water area 53 to the other water area 55 without using the pipe 61 and the pump 63. For example, it is possible to transport water by a bucket relay. It is also possible to supply water from one place to the other water area 53 by the pipe 61 and the pump 63 and discharge the water from the other water area 55 to another place by another pipe 61 and the pump 63. Furthermore, it is possible to allow natural inflow of water from other places by forming a water intake in one water area 53, and natural discharge of water to another place by forming a drain outlet in the other water area 55. It may be.

DESCRIPTION OF SYMBOLS 1 Float 3 Film body 9 Gas piping 13 Solution piping 23 Upstream 25 Downstream 27 One bank 29 Other bank 31 Bubble 32 Solution 41, 43 Channel 45, 47 Opening 53 One water area 55 Other water area 61 Piping 63 Pump

Claims (5)

Within a flowing water area, a plurality of anti-contamination membranes are formed so as to cross from one bank to the other bank, and a part of each of the upstream and downstream sides is opened, and the one bank and the other bank are Between them, so as to form an elongated channel from at least one to the other,
Spraying the solution into water by supplying a solution containing an aggregating agent over at least a partial section from the upstream side of the flow path;
A method for preventing pollution comprising: supplying gas over the at least part of the flow path to cause the gas to be ejected into water in the form of bubbles. In the water area, a plurality of anti-fouling films are formed so as to cross from the one bank to the other bank, so that a part of each of the one water area side and the other water area side is opened, and Installing so as to form an elongate channel from at least one to the other between the other bank,
Forming a flow of water from the one water area to the other water area;
Spraying the solution into water by supplying a solution containing an aggregating agent over at least a partial section from the upstream side of the flow path;
A method for preventing pollution comprising: supplying gas over the at least part of the flow path to cause the gas to be ejected into water in the form of bubbles.   The pollution prevention method according to claim 2, wherein a flow of water from the one water area to the other water area is formed by transporting water from the other water area to the one water area without passing through the flow path.   The plurality of antifouling films are installed so as to form an elongate flow path that makes one reciprocating or meandering between the one bank and the other bank by folding back at least once. 4. The method for preventing pollution according to any one of 3 above. By supplying a solution containing a flocculant only in a partial section from the upstream side of the flow path, the solution is jetted into water,
The pollution prevention method according to any one of claims 1 to 4, wherein the gas is jetted into water into a bubble by supplying a gas only to the partial section of the flow path.

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