KR20040013917A - Structure for artificial marshy land and sewage treatment device using thereof - Google Patents

Abstract

PURPOSE: Provided is a structure for an artificial wetland and a wastewater treatment apparatus using the same, which can effectively eliminate nitrogen and phosphorous in wastewater with water plants in short time by smoothing flow of wastewater in wetland and further provided is a wastewater treatment apparatus using the same structure. CONSTITUTION: The structure comprises a lower and an upper frames(20,10), a plurality of vertical pillars(21,11) fixed to the frames(20,10) in perpendicular direction to water flow, a plurality of pockets(25,15) provided between the pillars(21,11) so the pockets(25,15) are not flown off by water flow and in which water plants are planted, and a perforated panel(30) provided on the top of the upper frame(10), wherein the panel(30) is made of shells and polyethylene adhesive or shell power and clay.

Description

Structure for artificial marsh and sewage treatment device using the same

The present invention relates to a structure for artificial wetlands and a sewage treatment apparatus using the same, and more particularly, by constructing artificial wetlands by planting aquatic plants, nitrogen (N), phosphorus (P) and the like contained in wastewater by vegetation of aquatic plants. The present invention relates to a structure for artificial wetland and to a sewage treatment apparatus using the same.

Conventionally, as a sewage treatment method for purifying industrial wastewater or domestic sewage, a sedimentation method, a decomposition method using activated sludge, or an electrochemical treatment method has been mainly used. However, these sewage treatment methods are not economical because they require expensive facility costs, operation costs, and management costs, and they are focused on removing organic substances in high concentrations. ), There is a problem that the removal is almost not made.

On the other hand, in order to solve the above problems, recently, a sewage treatment method for naturally purifying wastewater or domestic sewage by forming artificial wetlands by aquatic plants has been developed and used. Thus, an example of a sewage treatment method using an artificial wetland is disclosed in Patent Registration No. 266085 and Utility Model Registration No. 251872.

The sewage treatment method disclosed in the above publications is a method of forming artificial wetland by planting aquatic plants in soil containing gravel and slag or in a soil in which gravel and sand are sequentially stacked. Absorption to aquatic plants removes nitrogen and phosphorus from sewage. Therefore, according to the sewage treatment method disclosed in the above publications, since the waste water stays in the soil for a predetermined time, there is a problem in that it is difficult to treat a large amount of waste water due to a long treatment time of the waste water.

In addition, according to the sewage treatment method disclosed in the above publications, since the method of absorbing nitrogen and phosphorus using only aquatic plants, there is a problem that the treatment efficiency is low.

The present invention was developed to solve the above problems, It is an object of the present invention to provide a structure for artificial wetlands and a sewage treatment apparatus using the same, which can realize artificial wetlands having a short treatment time for wastewater and having good treatment efficiency.

1 is an exploded perspective view of the structure for artificial wetland according to the present invention.

2 is a cross-sectional view taken along the line A-A in FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

4 is an enlarged view of a portion “C” in FIG. 3;

5 is a schematic side cross-sectional view of the sewage treatment apparatus according to the present invention.

Figure 6 is a perspective view schematically showing a wetland tank in the sewage treatment apparatus of FIG.

<Explanation of symbols for the main parts of the drawings>

10: upper frame 20: lower frame

15, 25: vertical column 30: cover

40: pocket for vegetation 50: aquatic plants

60: porous molded body 70: artificial sintered aggregate

80: aeration diffuser 100: artificial wet structure

110: inlet 120: outlet

140: bulkhead 200: wetland

300: sedimentation tank

An object of the present invention as described above, each outer peripheral surface is formed in the form of a screen to allow free access of the waste water, and the upper and lower frames are stacked side by side and installed, and the flow of waste water inside the upper and lower frames It can be achieved by a structure for artificial wetland comprising a plurality of vertical pillars installed to be perpendicular to the direction, and between the vertical pillars in the upper frame and a vegetation pocket for planting aquatic plants therein.

Here, the vertical column preferably has a cross-sectional cross-sectional shape so as to secure a sufficient contact area with the microorganisms, thereby improving the resolution of contaminants by the microorganisms.

In addition, the top of the upper frame may be a porous molded body formed by mixing oyster shell and polyethylene adhesive, or a porous artificial sintered aggregate formed by mixing oyster shell and clay. The artificial sintered aggregate is heat-molded by mixing oyster shell powder and clay in a ratio of 1: 1.5 to 2.5, and preferably, by mixing oyster shell powder and clay in a ratio of 1: 2. In this way, by installing a porous molded body or artificial sintered aggregate using the oyster shell, it is possible to reduce the biochemical oxygen demand (BOD) of the waste water and to remove the suspended material (SS).

In addition, a diffuser for aeration may be installed at the bottom of the lower frame.

On the other hand, in the present invention, the outer circumferential surface is formed in the form of a screen to allow free access of the waste water, the upper and lower frames are stacked side by side and installed so as to be perpendicular to the flow direction of the waste water inside the upper and lower frames. Installed between the plurality of vertical pillars and the vertical pillars in the upper frame, and inside the plurality of artificial wetland structures each having a vegetation pocket in which aquatic plants are planted, arranged side by side, And a wetland tank having an inflow portion through which wastewater flows in, a discharge portion through which the wastewater passing through the artificial wetland structures is discharged, and a partition wall zigzagly connected from the inflow portion to the discharge portion to form a flow path of wastewater. A sewage treatment apparatus is provided.

A porous molded body formed by mixing oyster shell and polyethylene adhesive is installed at a part near the inlet part of the upper end of the wetland tank, and a porous artificial sintered aggregate formed by mixing oyster shell and clay at a part near the discharge part. Can be installed.

In addition, the sewage treatment apparatus according to the present invention may further include a sedimentation tank installed on the upstream side of the wetland tank in order to settle and remove the sludge contained in the waste water before entering the wetland tank.

Hereinafter, a preferred embodiment of the structure for artificial wetland according to the present invention will be described in detail with reference to FIGS. 1 to 4.

1 is a schematic exploded perspective view of a structure for artificial wetland according to the present invention, Figure 2 is a cross-sectional view taken along the line A-A in Figure 1, Figure 3 is a cross-sectional view taken along the line B-B in FIG.

As shown in Figure 1, the structure for artificial wetlands 100 according to the present invention, the upper and lower frame 10 and the lower frame 20 of the rectangular box-shaped stacked stacked up and down, the upper surface of the upper frame 10 It is provided with a cover 30 installed to cover the.

The outer circumferential surface of the upper frame 10 is formed in the form of a screen to allow the waste water to freely enter and exit. That is, since a plurality of vertical members 11 are arranged side by side at a predetermined interval on the side of the upper frame 10, a plurality of horizontal members 13 are arranged side by side at a predetermined interval on the upper and lower surfaces, The waste water can freely enter and exit the upper frame 10 through a space between the vertical members 11 and the horizontal members 13.

Inside the upper frame 10, a plurality of vertical pillars 15 having a cross-sectional shape crosswise is provided. The vertical columns 15 are installed to be perpendicular to the flow direction of the waste water flowing into one side of the upper frame 10 at predetermined intervals from each other.

A plurality of vegetation pockets 40 for planting aquatic plants 50 capable of removing nitrogen (N), phosphorus (P) and the like contained in the wastewater are installed between the vertical columns 15. Vegetation pocket 40 is formed of a mesh-like material so that the root of the aquatic plant 50 can be in contact with the waste water. In this way, the aquatic plant 50 is in contact with the waste water passing through the pocket 40 for vegetation, it is possible to effectively adsorb, decompose and remove nitrogen (N) and phosphorus (P) contained in the waste water. On the other hand, in this embodiment is shown that four vegetation pockets 40 are installed, the number of vegetation pockets 40 is not limited to this.

As shown in FIG. 2, the vertical columns 15 are arranged to form a row and a column in the upper frame 10, and the vertical columns 15 of the front column and the rear column are arranged in a staggered manner.

Like the upper frame 10, the lower frame 20 is formed in the form of a screen whose outer circumferential surface is composed of the vertical member 21 and the horizontal member 23, and a plurality of vertical pillars 25 are installed therein.

Unlike the upper frame 10, only the vertical pillars 25 are installed in the lower frame 20, which prevents the waste water from being blocked by sludge when circulating in the structure 100 for the wetland, In addition, to secure a space for installing an aeration device (Airation) for promoting the circulation of the waste water at the inner bottom of the lower frame 20 as described below.

In addition, as shown in FIG. 3, as in the upper frame 10, the vertical columns 25 are arranged in rows and columns in the lower frame 20, and the vertical columns 25 of the front and rear columns are arranged. They are staggered and staggered. On the other hand, as shown in Figure 4, the vertical pillars 25 in the lower frame 20, as in the upper frame 10, the flow direction of the waste water flows into one side of the lower frame 20 (arrow of Figure 4) Direction).

As described above, the vertical pillars 15 and 25 in the upper frame 10 and the lower frame 20 are perpendicular to the flow direction of the wastewater, and the rear and rear columns are alternately arranged so that the wastewater is the upper frame 10. ) And to suspend the suspended matter (SS) contained in the waste water by hitting the vertical pillars (15, 25) during the passage through the lower frame (20).

On the other hand, the cross-sectional shape of the vertical columns (15, 25) is formed in the cross shape to increase the contact area with the microorganisms to provide a good habitat environment to increase the decomposition efficiency of contaminants by the microorganisms. However, the cross-sectional shape of the vertical columns (15, 25) is not limited to the cross shape and may be any other form as long as it can secure a sufficient contact area with the microorganisms. In addition, the vertical pillars 15 and 25 are preferably made of a material such as plastic, which prevents corrosion because it comes into contact with the waste water.

The cover 30 (refer to FIG. 1) covering the upper surface of the upper frame 10 is formed of a mesh-like material so that waste water can pass through the surface thereof. Although not specifically illustrated in FIG. 1, on the cover 30, a porous molded body 60 (FIG. 5) formed by mixing the oyster shell and the polyethylene adhesive and heat-molding may be installed.

Oyster shell has excellent physical and chemical adsorption ability, so it can adsorb and remove heavy metals contained in waste water or eutrophication materials such as nitrogen and phosphorus, and it has a carrier property that microorganisms can easily attach and grow. It can be used very effectively for biological treatment. The method for producing a porous molded article using the oyster shell having such characteristics is described in Korean Patent Application No. 2001-74538 filed by the present applicant as of Nov. 28, 2001 (name of the invention: Porous molded article for river purification using oyster shell) Is disclosed.

That is, the porous molded body is formed by mixing oyster shell powder having a particle diameter of 30 mesh or less and 20-30 parts by weight of low density polyethylene (LDPE) adhesive agent with respect to 100 parts by weight of the oyster shell, and then heating to a temperature of 100 ° C. to 150 ° C. can do.

On the other hand, when producing a porous molded body using a small amount of polyethylene adhesive of 25 parts by weight or less with respect to 100 parts by weight of oyster shell, in order to increase the strength (hardness) of the molded material, polypropylene (PP) fiber is used as a support. It can be added, but is added within 5% by weight based on the total amount of the oyster shell and the polypropylene fiber.

By installing the porous molded body prepared in this way on the upper part of the upper frame 10, various heavy metals (Pb, Cd, Zn, Cu, etc.) contained in the waste water can be removed, and not removed by the aquatic plant 50. Since it is possible to additionally remove eutrophic substances such as nitrogen or phosphorus, it is possible to lower the biochemical oxygen demand (BOD) of the waste water and to increase the efficiency of removing the suspended solids (SS) compared to the case of using only the aquatic plant 50. .

In addition, it is also possible to further improve the removal range and the removal capacity of the contaminants by further adding an additive selected from activated carbon, ductile iron, zeolite, or a mixture thereof having selective contaminant removal ability in the production of the porous molded body. .

On the other hand, the artificial sintered aggregate 70 (Fig. 5) using the oyster shell may also be installed on the cover 30 instead of the above-mentioned porous molded body. Artificial sintered aggregate is a spherical material having a diameter of 10 mm to 20 mm, and is formed by mixing oyster shell and clay in a ratio of 1: 1.5 to 2.5, preferably in a ratio of 1: 2, and then heating to a high temperature. As such, the artificial sintered aggregate has a high strength by molding at a high temperature, and is formed of a porous sintered material under the influence of carbon dioxide (CO ₂ ) discharged from the oyster shell during the high temperature molding.

Such artificial sintered aggregates have excellent affinity with microorganisms like the above-mentioned porous molded body, and function as a carrier for attaching microorganisms. Therefore, by installing the artificial sintered aggregate on the upper part of the upper frame 10, it is possible to increase the resolution of contaminants by microorganisms, thus reducing the biochemical oxygen demand (BOD) of the waste water by the microorganisms, suspended matter (SS) ) Can increase the treatment efficiency.

In addition, although not specifically illustrated in FIG. 1, the bottom of the lower frame 20 promotes circulation of wastewater in the upper frame 10 and the lower frame 20 to increase the efficiency of reducing the biochemical oxygen demand (BOD). In order to do this, an air diffuser 80 (FIG. 5) may be installed.

Hereinafter, a preferred embodiment of the river treatment apparatus using the above-described artificial wetland structure 100 with reference to FIGS. 5 and 6 will be described.

Figure 5 is a side cross-sectional view schematically showing a river treatment apparatus according to the present invention, Figure 6 is a perspective view schematically showing a wetland tank in the sewage treatment apparatus of FIG.

As shown in Figure 5, the sewage treatment apparatus according to the present invention, the artificial wetland structure 100 of Figure 1 by forming a plurality of side by side arranged wetland tank for purifying the waste water by the aquatic plant 50 ( 200), and the sedimentation tank 300, which is installed on the upstream side of the wetland tank 200 to precipitate and remove sludge from the wastewater before flowing into the wetland tank 200, and between the sedimentation tank 300 and the wetland tank 200. It consists of a separating wall 400 installed in.

The waste water is stored in the settling tank 300 through the inlet pipe 310, and ascending to the settling tank 300 by a predetermined height to the wetland tank 200 through the connecting pipe 410 formed at the upper end of the separation wall 400. It flows in.

As illustrated in FIG. 6, the wetland tank 200 is formed by arranging a plurality of artificial wetland structures 100 in a checkerboard shape and forms a rectangular hexahedron as a whole. Three sides of the wetland tank 200 are blocked by the outer wall 130, both ends of the other one side is opened to enter the inlet 110 and the inlet 110, the waste water flows into the structure for artificial wetland (100) The wastewater that passes between the through to form a discharge portion 120 is discharged. On the other hand, a plurality of partition walls 140 are installed in the interior of the wetland tank 200 along the sides of the artificial wetland structure 100 so as to form a flow path of waste water from the inlet 110 to the outlet 120.

Waste water overflowed from the settling tank 300 is introduced into the wetland tank 200 through the inlet 110, flows into the upper frame 10 and the lower frame 20 of the artificial wetland structure 100 at the same time. (See Figure 5). Thereafter, the wastewater flows in a zigzag form along the flow path formed by the partition wall 140 and passes through the structure for artificial wetland. In this process, the waste water is removed by the aquatic plant 50 planted in the upper frame 10 of the structure for artificial wetland 100 to remove nutrients such as nitrogen or phosphorus, and then discharged through the discharge unit 120. do. In this way, the waste water flows in a zigzag form inside the wetland tank 200 so that the waste water can be sufficiently in contact with the root of the aquatic plant 50, and thus a sufficient treatment effect can be obtained even during a short purification treatment time. The purified water discharged from the wetland tank 200 is then flowed to the river and the like through the discharge pipe 210 (FIG. 5).

On the other hand, as shown in Figure 5, the upper portion of each artificial wetland structure 100, that is, the upper end of the wetland 200, the porous molded body 60 using the oyster shell as described above in order to increase the purification efficiency of the waste water. ) Or artificial sintered aggregate 70 may be installed. In this embodiment, the porous molded body 60 is installed on the side where the inlet 110 is located, and the artificial sintered aggregate 70 is disposed on the side where the inlet 110 is located. Installed. However, it may be possible to install only the porous molded body 60 or the artificial sintered aggregate 70 only in the entire upper end of the wetland tank 200.

In addition, as described above, the bottom surface of each artificial wetland structure 100, that is, the inner lower end of the wetland tank 200 to increase the efficiency of reducing the biochemical oxygen demand (BOD) of the waste water in the aeration pipe 80 may be installed.

On the other hand, in the above embodiment has been described by taking an example of the precipitation tank 300 as a pretreatment facility upstream of the wetland tank 200, the present invention is not limited thereto. For example, in the case of effluent coming out of the contact oxidizing tank may be directly connected to the wetland furnace 200 without the settling tank 300, it may also be connected to the river water directly to the wetland tank (200).

As described above, according to the structure for artificial wetland according to the present invention, the upper frame is provided with a mesh-type vegetation pocket for growing a plurality of vertical pillars and aquatic plants, the lower frame has a plurality of vertical pillars By installing only the field, it is possible to smooth the flow of the waste water during the purification of the waste water by the aquatic plants and to shorten the treatment time.

In addition, since the porous molded body or artificial sintered aggregate using the oyster shell having excellent adsorption power of heavy metals and organic substances and having microbial carrier properties is installed on the upper part of the upper frame, the biochemical oxygen demand (BOD) of wastewater is reduced by the microorganism. By removing the suspended solids (SS) can increase the treatment efficiency of waste water.

On the other hand, according to the sewage treatment apparatus according to the present invention, by arranging a plurality of structures for artificial wetlands in the form of a checkerboard to form a wetland tank, by allowing the waste water to contact the roots of aquatic plants while zigzag through the interior of the wetland tank, The treatment time of the waste water is short, but the removal efficiency of eutrophic substances such as nitrogen and phosphorus by aquatic plants is high.

In the above, certain preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. will be.

Claims (11)

Upper and lower frames each of which has an outer circumferential surface formed in a screen form so as to allow free access of the waste water, and are stacked side by side; A plurality of vertical pillars installed in the upper and lower frames so as to be perpendicular to the flow direction of the waste water; And Installed between the vertical pillars in the upper frame and the structure for artificial wetland, characterized in that it includes a vegetation pocket for planting aquatic plants. The method of claim 1, The vertical pillar is a structure for artificial wetlands, characterized in that it has a cross-sectional shape of the cross-shaped so as to secure a sufficient contact area with the microorganism. The method of claim 1, The upper structure of the upper frame, the artificial wet structure, characterized in that the porous molded body formed by mixing the oyster shell and polyethylene adhesive, or a porous artificial sintered aggregate formed by mixing the oyster shell and clay. The method of claim 3, wherein The artificial sintered aggregate is artificial wet structure, characterized in that the heat-molded after mixing the oyster shell powder and clay in a ratio of 1: 1.5 to 2.5. The method of claim 1, At the bottom of the lower frame is an artificial wet structure, characterized in that the diffuser for aeration is installed. Each outer circumferential surface is formed in a screen form to allow free access of the wastewater, and the upper and lower frames are stacked side by side, and a plurality of vertical columns are installed in the upper and lower frames so as to be perpendicular to the flow direction of the waste water. Is installed between the vertical pillars in the upper frame, the interior of the plurality of artificial wetland structures each having a vegetation pocket in which aquatic plants are planted is made side by side, And a wetland tank having an inflow portion through which wastewater flows in, a discharge portion through which the wastewater passing through the artificial wetland structures is discharged, and a partition wall zigzagly connected from the inflow portion to the discharge portion to form a flow path of wastewater. Sewage treatment apparatus characterized in that. The method of claim 6, The vertical column is a sewage treatment apparatus, characterized in that the cross-sectional shape of the cross-shaped so as to ensure a sufficient contact area with the microorganism. The method of claim 6, The sewage treatment apparatus, characterized in that the porous molded body formed by mixing the oyster shell and the polyethylene adhesive, or the artificial artificial aggregate aggregate formed by mixing the oyster shell and clay is installed at the upper end of the wetland tank. The method of claim 6, A porous molded body formed by mixing oyster shell and polyethylene adhesive is installed at a part near the inlet part of the upper end of the wetland tank, and a porous artificial sintered aggregate formed by mixing oyster shell and clay at a part near the discharge part. Sewage treatment apparatus characterized in that the installation. The method of claim 6, Sewage treatment apparatus, characterized in that the diffuser is installed on the inner bottom of the wet tank for aeration. The method according to any one of claims 6 to 10, And a sedimentation tank installed on an upstream side of the wetland tank to settle and remove sludge contained in the wastewater before flowing into the wetland tank.