KR101372569B1 - Leachate cleaning device having bifurcation device - Google Patents

Abstract

The present invention relates to a leachate cleaning device having a bifurcation device. More specifically, a corrugated pipe comprises a flexible corrugated pipe capable of bending in all directions and a rectangular plate fixed to both ends. is a corrugated pipe bend in either direction. A straight pipe comprises a straight pipe which is a circular tube, a rectangular slot, a semi-circular pipe support which supports and fixes the straight pipe, a rectangular moving body, and moving wheels moving in all directions.

Description

Leachate treatment devices with branching distribution devices

The present invention relates to a leachate treatment apparatus having a branchable dispensing apparatus, and more particularly, to a leachate treatment apparatus having a branchable dispensing apparatus configured to branch leachate through a branch body having a plurality of branch pipes to a plurality of points. It is about.

Generally, the leachate generated from municipal waste landfill varies depending on many environmental variables such as type of landfill, amount of landfill, landfill period, landfill type, landfill method, rainfall, climatic condition, and waste compaction Recently, the quality of leachate has become more diverse and complicated due to the burgeoning of municipal waste containing new synthetic materials due to the improvement of living standard and industrial technology.

VFA (Volatile Fatty Acids) type organic substances are present in the leachate at the initial stage of landfill. VFA content is decreased and the Fulvic-Like Material (Carboxyl Group, Aromatic Hydroxyl Group, etc.) . Nitrogen contained in the leachate is about 5 times more than that of the landfill when the landfill time is over 5 ~ 6 years. And the concentration range is usually varied from 300 to 4,000 mgN / ℓ.

However, in the conventional leachate treatment apparatus, only the biological treatment using the activated sludge is mainly performed in order to treat only the organic substances such as BOD and COD, so that the nitrogen contained in the leachate at a high concentration is almost not treated. Furthermore, since the nitrogen contained in the leachate is high in concentration, it is very difficult to properly treat the organic nitrogen. Organic Nitrogen, which is biodegradable during the stay in the landfill, is mostly ammoniated, but the VFA concentration is low, In fact, in order to properly treat high concentration nitrogen, it is required to supply an external carbon source together with biological treatment.

Conventionally, the method of treating the leachate of the sanitary landfill is roughly modified by slightly changing each unit process in a process consisting of "anaerobic digestion → activated sludge → chemical aggregation → filtration → advanced treatment". One of them is composed of "anaerobic digestion → aeration lag → sedimentation tank → rotation disc method → sedimentation tank → agglomeration coagulation → sand filtration → ozone treatment (or activated carbon filtration)" (Korean Patent Laid-Open Publication No. 97-015493 ). Another treatment process is composed of "anaerobic digestion → activated sludge → oxidation of Fenton → granular activated carbon treatment" (Korean Patent Laid-Open Publication No. 97-042328).

On the other hand, there is a method of treating with a reverse osmosis membrane by physico-chemical treatment (Korean Patent Publication No. 97-010662).

Among them, conventional anaerobic digestion tanks are mainly used in the anaerobic digestion process during the biological treatment process. The conventional anaerobic digestion tank is a method of mixing microorganisms and wastewater together in a digester, and the concentration of microorganisms in the anaerobic digestion tank is low. Therefore, the processing time is very long, which is about 10 to 20 days. In recent years, attempts have been made to treat leachate using a high rate anaerobic digestion tank in a variety of ways (Korea Waste Society Journal Vol. 13, No. 2, pp. 211 (1996)). The rotary disk method, which is widely used in the leachate treatment process, is not easy to operate, and is particularly susceptible to temperature changes, so that it is hardly processed in the winter season. The leachate is generally introduced into the anaerobic digestion tank without pretreatment. However, there is a problem that the floats (SS) present in the leachate are formed on scale in the actual operation. Further, during the leachate treatment process, the Fenton oxidation method requires excessive use of the chemicals because the chemicals are used excessively. In particular, H2O2 is expensive compared to general wastewater treatment chemicals.

Although various methods for reprocessing landfill leachate have been suggested, reverse osmosis membrane method and ozone treatment method are relatively easy to operate, but the initial facility cost and operation management cost are too large to be economically feasible. Chemical oxidation by chemicals (especially advanced oxidation process ) Has a problem that the cost of chemicals is high and the amount of sludge generated is large and the generated sludge is difficult to be treated.

On the other hand, in the case of Fenton oxidation, the H2SO4 dust spreads into the air, causing corrosion of the leachate treatment apparatus, and serious side effects such as causing health risks to the driver. In particular, O3 causes problems in the atmosphere.

Since the concentration of organic matter is high initially and the concentration of nitrogen increases with time, organic matter is initially removed, and then nitrification and denitrification are performed to remove organic matter and nitrogen. On the other hand, the function of removing and nitrifying organic substances from leachate is not high, but plants in wetlands are valuable as carbon sources for denitrification. In addition, the soil adsorbs the degradation substances contained in the compost, so that the plants can grow well (soil characteristics). On the other hand, if the leachate is put into a wetland without any purification process, it is difficult to grow the plant by a large amount of biodegradable organic material contained in the leachate. Therefore, only a small amount of leachate should be put into the wetland, There is a problem in that it must be very wide.

Korean Patent Publication No. 97-015493

However, in the conventional leachate treatment apparatus, the outflow pipe for letting out the leachate is fixed, and the leachate is intensively supplied only to a specific portion of the artificial wetland because the leachate flows out through a single path. Since leachate contains various harmful substances, if it leaks only to a certain part, the ecosystem of that part is disturbed and the entire ecosystem of artificial wetland is damaged.

Accordingly, an object of the present invention is to provide a leachate treatment apparatus having a branch structure of an outflow pipe for outflow of leachate and having a branchable distribution device configured to be easily detached from the outlet pipe of the branch structure.

The present invention for achieving the above object is to flow into the landfill leachate to adjust the flow rate of the leachate, the leachate introduced through the flow rate adjusting tank to anoxic-aerobic conditions to nitrate the leachate and to reduce the organic matter and nitrogen load A bioreactor, a sump to remove suspended solids and sediment from the leachate introduced through the bioreactor, and consists of a surface layer and a gravel layer to remove hardly decomposable COD and NOXN from the leachate introduced through the sump, and partitions to prevent the leachate from spilling. It is provided as a leachate treatment apparatus having a branched distribution device having a downflow artificial wetland, formed in the gravel layer of the downflow artificial wetland and the leachate is discharged through a drain pipe having an opening and closing means in the drain.

The leachate treatment apparatus having such a branching distribution device is characterized in that the outflow pipe for leachate from the sump to the downflow artificial wetland includes 1) a corrugated pipe configuration, 2) a straight pipe with moving wheels, and 3) a compressed air filled straight line. 4, one feed pipe and a plurality of branch pipes are composed of a branch body protruding in each direction; The above-mentioned 1) corrugated pipe structure is composed of a corrugated pipe which can bend in any direction, and a rectangular plate fixed to both ends of the corrugated pipe so as to communicate with the corrugated pipe; 2) The straight pipe configuration with a moving wheel is a straight tube which is a circular tube in a straight direction, a square slot which is fixed to both ends so as to communicate with the straight tube is fitted while the three sides of the square plate of the corrugated pipe is fitted, the straight line A semi-circular tube support for supporting and clamping the tube, a rectangular moving body supporting the tube support from below, and a plurality of moving wheels fixed to the bottom of the moving body and moving in any direction; 3) The configuration of a straight tube filled with compressed air is a straight tube which is a circular tube in a straight direction, a square slot which is fixed at both ends so as to communicate with the straight tube and is accommodated while three sides of the square plate of the corrugated pipe are fitted. A semicircular tube support for supporting and fitting a straight tube, and a rectangular floating body filled with compressed air therein; 4) The branch body in which one supply pipe and the plurality of branch pipes protrude in each direction is N-shaped (N is a natural number of 3 or more), and the number of branch pipes is N-1, and each of the supply pipes and branch pipes is Characterized in that the square plate is provided.

In an embodiment, the drain pipe is connected in parallel to the ground surface in the artificial wetland and bent in the waterway in a vertical direction with respect to the ground surface extending from the artificial wetland toward the ground in the waterway, opening and closing means in the portion bent in the vertical direction The first drain provided is formed and includes a second drain formed in a vertical direction.

In an embodiment, the second drain is formed 10 to 30 centimeters below the ground surface extending from the wetland.

According to the preferred effect of the present invention, by configuring the outflow pipe structure of the leachate containing a large amount of harmful substances in a branched structure to protect the purification function of the artificial wetland there is an advantage that can further extend the life of the leachate treatment apparatus.

In addition, there is an advantage that the work time is not extended according to the branch structure by configuring to easily detach the branch structure of the outlet pipe.

In addition, since there are various types of branching structures, there is an advantage in that an outlet pipe suitable for artificial wetlands having various structures can be installed.

Fig. 1 is a flowchart showing a method of treating landfill leachate of the present invention,
Figure 2 is a cross-sectional view of the downflow artificial wetland of the present invention,
3 is a cross-sectional view of the downflow artificial wetland of the present invention,
Fig. 4 is a top view of the downward-flow artificial wetland of the present invention,
FIG. 5 is a side view showing an overall appearance of an outflow pipe according to an embodiment of the present invention,
6 is a perspective view showing the branch structure of the outlet pipe according to the embodiment of the present invention,
7 is a cross-sectional view showing a branch structure of the outlet pipe and a blocking plate for blocking one branch pipe according to another embodiment of the present invention;
8 is a cross-sectional view illustrating various embodiments of the present invention,
9 is a plan view showing a plane of the outlet pipe according to an embodiment of the present invention.

As described above, the conventional method for reprocessing landfill leachate is relatively easy to operate in the case of the reverse osmosis membrane process and the ozone treatment method, but the initial facility cost and the operation management cost are excessively large, resulting in low economic efficiency. oxidation process has a problem in that not only the cost of chemicals but also the amount of sludge generated is large and the generated sludge is difficult to be treated.

Accordingly, the present invention provides a method for controlling leachate, comprising the steps of: 1) introducing landfill leachate into a flow control tank to control the amount of leachate introduced; 2) transporting the leachate introduced through the flow control tank to an anaerobic- And 3) removing the suspended matters and sediments by transferring the leachate introduced through the bioreactor to the collecting tank, and 4) transferring the leachate introduced through the collecting tank to the downflow type artificial wetland The present invention provides a method of treating landfill leachate comprising the step of removing decomposable COD and NOXN. Therefore, it is possible to remarkably reduce COD, which is difficult to decompose biologically and excellently denitrification effect, without addition of a separate medicine.

1 is a flowchart illustrating a landfill leachate treatment method according to an embodiment of the present invention. Referring to FIG. FIG. 2 and FIG. 3 are cross-sectional views of a downflow artificial wetland according to a preferred embodiment of the present invention, and FIG. 4 is a top view of a downward flow artificial wetland according to a preferred embodiment of the present invention.

The landfill leachate of the present invention means a liquid generated by mixing with rainwater or groundwater at various landfills such as a dump site. Therefore landfill leachate may contain impurities such as impurities or suspended solids and heavy metals.

First, as the step 1), the leachate generated in the landfill is collected in the flow rate regulator 110. The amount and characteristics of the leachate introduced into the bioreactor 120 can be controlled evenly.

Next, in step 2), the leachate introduced through the flow rate regulator 110 is transferred to the bioreactor 120 in which oxygen-free conditions are exchanged to nitrify the leachate to reduce organic matter and nitrogen load. The anaerobic condition and the aerobic condition of the anaerobic condition and the aerobic condition can be alternately performed by turning on and off the power through the normal SBR reaction tank, And preferably a single reactor as disclosed in Korean Patent Application No. 2002-49988 can be used, so that the patent is incorporated herein by reference.

Specifically, the anoxic condition is a step of removing air from the reaction tank to perform the reaction, thereby actively contacting the nitrate nitrogen (NOx-N) of the leachate with the denitrifying microorganism, and converting the nitrate nitrogen into nitrite nitrogen, Nitrogen is reduced to nitrogen (N2) gas and released into the atmosphere, thereby removing oxidized NOxN nitrogen in the leachate (denitrification process).

The reaction is then carried out under aerobic conditions by supplying air to the reaction tank. In the aerobic stage, nitrification occurs in which the organic matter of the leachate is firstly oxidized by aerobic microorganisms and ammonia is oxidized to nitrite nitrogen and nitrate nitrogen. Meanwhile, in the present invention, the amount of dissolved oxygen may be adjusted to 13 mg / L under the aerobic condition for the accumulation of nitrous nitrogen, and such adjustment of the amount of dissolved oxygen may use aeration. By controlling the amount of dissolved oxygen to 13mg / L by inhibiting the activity of the nitrifying bacteria it is possible to induce the accumulation of nitrite nitrogen by the oxidation reaction is terminated in the nitrite oxidation step.

The microorganisms that can be used in the biological reaction tank 120 of the present invention can be used without limitation in microorganisms used under normal anoxic condition and aerobic condition, and preferably, nitric acid which oxidizes ammonia nitrogen to nitrate nitrogen under aerobic conditions Denitrification bacteria such as Pseudomonas, Micrococos, and Bacillus, which are reduced with nitrogen gas under anaerobic or anaerobic conditions, can be used. Specifically, the above-mentioned tuberous microorganisms oxidize ammonia nitrogen to nitrate nitrogen at aeration, that is, in an aerobic condition, and under anaerobic conditions, microorganisms involved in denitrification among the microorganisms contained in the bioreactor 120 The nitrate is removed by the nitrogen gas while the nitrate is removed. The above-mentioned method is capable of continuously treating the nutrients in the leachate by maintaining the anaerobic-aerobic conditions in a single reaction vessel according to the spatial and temporal changes without internal transportation. To this end, the reaction can preferably be carried out with alternating oxygen-free conditions every 1 to 2 hours. On the other hand, the proper residence time is determined by the state of the inflowed leachate. If the concentration of nitrogen in the leachate is higher than the concentration of organic matter, the specificity of the anaerobic condition increases. Conversely, if the concentration of organic matter is high and the concentration of nitrogen is low, the aerobic condition becomes longer.

The length of time the leachate remains in the bioreactor depends on the concentration of the organic matter (COD) and the nitrogen (N) concentration. In the present invention, the condition of the conventional single reactor can be followed. That is, the higher the concentration, the longer the period and the lower the number becomes. Also, the larger the COD / N ratio, the shorter the anaerobic period, and the shorter the COD / N ratio, the longer the exhalation period and the alternation of anaerobic - exhalation conditions can last 24 hours a day.

Next, in step 3), the leachate introduced through the bioreactor 120 is transferred to the collecting tank 130 to remove suspended matters and sediments. Like the flow rate regulator 110, the water collecting tank 130 collects organic matter and NH 4 N -removed leachate from the bioreactor 120 in the collecting tank 130. Accordingly, it is possible to appropriately adjust the amount of the leachate introduced into the downflow artificial wetland 140 according to the situation, and to remove the suspended matters and the precipitate once again from the leachate. It is also possible to return the floating matters and sediments generated at this time to the landfill site.

Meanwhile, COD (NBD) and NOXN, which are difficult to be biodegraded, remain in the leachate having passed through the water collecting tank 130 in a state where suspended substances and decomposable COD and BOD are removed.

Next, in step 4), the leachate introduced through the water collecting tank 130 is transferred to the downflow type artificial wetland 140 to remove the degradable COD and NOxN. Unlike natural wetlands, artificial wetlands represent wetlands that artificially determine the direction, flow, and flow rate. Downstream man-made wetlands mean that the leachate is filtered from the surface of the wetland through the bottom of the wetland.

FIG. 2 is a cross-sectional view showing a preferred embodiment of the downflow type artificial wetland according to the present invention. Specifically, the downflow type artificial wetland 200 of the present invention includes an outflow tube 210 through which leached water transferred from the water collection vessel flows, The constructed wetlands 220 and 230 through which the leachate flowing out of the wetlands 210 pass and the drainage pipe 240 through which the leachate passing through the wetlands 220 and 230 are discharged.

First, the outflow pipe 210 is constructed so that the downflow type artificial wetland 200 drains the leachate transferred from the water collecting tank, and the number, diameter and length of the outflow pipes can be adjusted appropriately according to the purpose. Preferably, the outlet pipe may be provided with one outlet pipe having a diameter of 12 m and a length of 5 m per 5 m in length. 4 is a top view of the downflow type artificial wetland according to the present invention. As shown in FIG. 4, the outflow pipe 410 may include a plurality of outflow pipes 420 and 421 for a certain interval (3-6 m) It can be formed at regular intervals so that the leachate flows out evenly to the wetland. Further, if a plurality of outflow pipes having different lengths are provided and the leachate is allowed to flow out from the ends of the outflow pipes, the leachate may flow out evenly to the wetlands, but the present invention is not limited thereto.

The leachate passing through the outflow pipe 210 passes through the constructed wetlands 220 and 230. In this case, preferably, the artificial wetland may be formed of the surface layer 220 and the gravel layer 230 sequentially. First, the surface layer 220 is provided to provide an environment suitable for the growth of a wetland plant, and may be formed so as to facilitate the implantation of the wetland plant with a certain ratio of humus and sand. Here, the wetland plant planted in the surface layer 220 may be preferably reed.

That is, in order to purify the leachate discharged through the outflow pipe 210, the wetland plants that are planted in the surface layer 220 should select the species according to the composition and condition of the pollution source, It should be able to grow rapidly in the growth rate of the plant and roots, and grow in the soil or in the place where the water is locked. The wetland plants satisfying the above conditions include not only dry areas, Resistive reeds are best suited, but not limited to.

Here, various microorganisms are present in the surface layer 220, and the microorganisms are largely aerobic microorganisms, anaerobic microorganisms, and anaerobic microorganisms. In other words, degradation and removal of pollutants in wetlands occurs most often in plant roots or sediment soils, which is achieved through interaction with microorganisms. In other words, the roots of the wetland plants provide oxygen to the planted soil layer to form a rhizosphere around the root hair of the wetland plants to provide an environment in which aerobic microorganisms can grow, and other areas are anaerobic to anaerobic , The denitrification process of the leachate is performed using the root of the dead plant as the carbon source. It is possible to decompose COD and adsorb it on the soil and decompose it through the environment as described above.

On the other hand, the role of the microorganisms in the purification of water by the downflow type artificial wetland structure of the present invention is higher than the purification effect by plants. In other words, since microorganisms have different nutrients according to their species, it is possible to remove various pollutants through complementary functions by maintaining diversity of microorganisms inhabit wetlands. Here, an example of the process of converting NOx into nitrogen gas by anaerobic microorganisms or anoxic microorganisms can be mentioned.

The denitrification process (denitrifying microorganism, anaerobic or anaerobic microorganism)

2CH2O (Hydrolytic material of plant root or leachate) + NO3 (Leachate) Hardly degradable material contained in leachate such as 2CO2 + H2O + 1 / 2N2 Humus is attached to soil due to its large particles, and anaerobic and denitrifying microorganisms It is shown to decompose it and in particular the denitrification is carried out by anaerobic or anaerobic microorganisms. For example, if the compost is wetted with water, black water is leached, but if the compost is put into the farmland, it will change the soil well and propagate various microorganisms to help the plant grow. Therefore, in the aerobic state, organic matter and nitrogen (NH4N) are oxidized, and in the anaerobic state, NOXN is removed by inducing the denitrification effect. Therefore, since the leachate flowing into the wetland through the outflow pipe 210 contains almost no decomposed organic matter and NH 4 N, it is very important to remove NO x and decomposing COD, so that the inside of the constructed wetland is maintained in anoxic condition Is very advantageous in removing NOXN and refractory COD.

The aerobic microorganisms can live not only in the surface layer 220 but also in the gravel layer 230. The closer to the surface layer 220 the aerobic microorganisms grow and the more distant from the surface layer 220 the growth of anaerobic microorganisms and denitrifying microorganisms It can be easy.

Also, as the microbial layer is formed thicker, anaerobic and denitrifying microorganisms can be grown even in the surface layer 220.

The surface layer 220 may preferably be a sandy loam consisting of 10-20% clay, 15-25% silt and 55-75% sand. The average particle diameter may be 0.0005 to 0.002 of clay, 0.005 to 0.02 of silt, and 0.5 to 3 of sand. If too much clay is present, the ability to remove degradable COD adhere is excellent, but soon it will close. Also, if the amount of sand is too much, the water permeability is excellent but the ability to remove degradable COD decreases.

As a result, in the surface layer 220, the degradable COD is adsorbed and removed on the zeolite particles constituting the surface layer, and the NOXN is removed through the anaerobic condition.

Next, the leachate having passed through the surface layer 220 passes through the gravel layer 230. The gravel layer 230 serves to prevent the sand from escaping into the drain pipe 240 and also to convert NOx in the leachate into nitrogen gas by adhering anaerobic and denitrifying microorganisms. The particle size of the gravel used at this time is not limited, but preferably, gravel having an average particle diameter of 5 to 30 may be used. In addition, the thickness of the gravel layer 230 may be 20 to 40, and if the thickness of the gravel layer 230 is less than 20, sand may easily escape, and if it exceeds 40, the production cost is remarkable compared to the effect. There is a growing problem.

Next, the leachate having passed through the gravel layer 230 is transferred out of the constructed wetland through the drainage pipe 240. In this case, a water channel (not shown) may be installed at the end of the drainage pipe 240 to transfer the leachate to the outside. Do not. Also, when a plurality of constructed wetlands are connected, the waterway 250 can also be connected. Also, the number, diameter, and length of the drain pipes 240 can be adjusted according to the purpose.

Meanwhile, the drain pipe 240 may be formed at the bottom of the gravel layer 230 or inside the gravel layer, and most preferably, 70 to 80 points away from the ground surface. The drain pipe 240 may be made porous so that leachate may be introduced from the outside. In this case, the size of the pore may be such that the water passes but the sand or gravel can not pass through. Meanwhile, the drain pipe 240 may be inclined so that the leachate can be transferred to the outside through the drain pipe 240. The partition wall 250 may be formed to prevent the leachate from flowing out. Thereby preventing leakage of the leachate, so that the constructed wetland can be flooded if the drainage pipe 240 is blocked.

Meanwhile, as described above, in order to remarkably increase the removal effect of denitrification and degradable COD in the wetlands, it is necessary to make the wetlands as anaerobic and / or anaerobic as possible. However, the water pipe formed in the normal wetland maintains the aerobic condition of the wetland because the air flows from the outside into the inside of the wetland (in particular, the lower part of the wetland). In other words, the lower part of the constructed wetland must be anaerobic and / or anaerobic condition, but the upper and lower parts of the wetland become aerobic condition because the air is introduced through the drain pipe installed in the lower part.

In order to solve this problem and remarkably increase the removal effect of NOXN and hardly degradable COD, the drain pipe is preferably provided with an opening and closing means in the drain of the drain pipe and the opening and closing means until the leachate reaches a certain level inside the artificial wetland. By blocking the drain to the interior of the artificial wetlands may be configured to remove the hardly decomposable COD and NOXN in anaerobic or anaerobic conditions. The opening / closing means may be a removable cover, a cap, but is not limited thereto, and the opening / closing means can be manually or automatically adjusted. As a result, if the drainage port formed in the channel region where the leachate is discharged is blocked, air can not be introduced into the inside of the constructed wetland through the drainage hole, and the leached water can not be discharged from the constructed wetland. As a result, the anaerobic conditions are mostly formed in the inside of the artificial wetland, and it is possible to effectively remove NOXN and degradable COD. Then, when the leachate reaches a certain level in the built-in wetland, the drainage port is opened to discharge the leachate into the water channel.

According to another preferred aspect of the present invention, the drain pipe 340 is communicated in parallel to the ground surface in the lower portion of the artificial wetland and extends bent in a vertical direction with respect to the ground surface extending from the artificial wetland toward the ground in the waterway, the vertical direction A first drain hole 341 having an opening and closing means is formed at a portion that is bent and a second drain hole 342 is formed at a position extending in a vertical direction so that the leachate can be discharged to the water channel 350 through the second drain hole. have. That is, as shown in FIG. 3, the drain pipe 340 may be formed as an "L" More specifically, referring to FIG. 3, in the inside of the constructed wetland, the drain pipe 340 maintains a horizontal position (there is a slight inclination to allow the leachate to flow) You can extend it. In other words, in the inside of the constructed wetland, the drain pipe 340 is installed horizontally (actually, a slight inclination is formed so as to allow water to flow) with respect to the ground surface, And can be extended while forming a bent portion. In this case, a first drain hole 341 may be formed at the bent portion of the drain pipe 340, and a second drain hole 342 may be formed at the vertically extended position. In this case, preferably, the first drain hole 341 may be provided with a separate opening and closing means, and the second drain hole 342 may be formed below 10 to 30 centimeters from the ground surface extended from the artificial wetland (A of FIG. 3). have.

As a result, the leachate that has passed through the artificial wetland is transferred to the first drain 341 along the drain pipe 340. When the opening and closing means provided in the first drain 341 is closed (blocking the first drain) Is not discharged to the water channel 350 is filled up to the vertically extending portion of the drain pipe (240). Since the leachate can not be discharged, the inundation occurs from the bottom of the constructed wetland.

On the other hand, since the second drain 342 is formed at the bottom 10 to 30 centimeters from the ground, when the leachate reaches the second drain 342, it is discharged to the waterway 350. If the second drain 342 is formed at the bottom 20 centimeters above the ground, the leachate is discharged when reaching the second drain 342, so that the artificial wetland is also flooded to the bottom 20 centimeters above the ground and the water level can be maintained . Therefore, since the leachate is filled from the bottom of the wetland to 20 centimeters below the ground level, the area is satisfied with the anaerobic or anaerobic condition, so that the NOXN and the hardly decomposable COD can be effectively removed as compared with the general wetland where the air is introduced through the drain pipe. Will be. When the drain pipe is simply provided with the opening and closing means, the opening and closing operation of the opening and closing means of the drain hole must be repeated. However, in the case of using the drain pipe shown in FIG. 3, the oxygenated and / or anaerobic tank So it is very efficient.

Meanwhile, the artificial wetland of the present invention is designed for the purpose of removing the degradable COD and NOxN. In this case, it is expected that the hardly degradable COD can be removed at a rate of 70 g / day for each wetland and 7 g / day for NOXN.

As a result, the landfill leachate treatment method according to the present invention is able to perform secondary filtration of insoluble COD and the like that have not been precipitated in the bioreactor, and thus, Can also effectively remove NOXN and refractory COD. In addition, if the inside of the artificial wetland is formed in an anaerobic or anaerobic condition using a specific drainage pipe, it is possible to maximize the removal efficiency of NOXN and hardly degradable COD.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments, but the present invention is not limited thereto.

≪ Example 1 >

The leachate was treated in accordance with FIG. Specifically, landfill leachate was treated using a pilot plant in which a flow control tank, a bioreactor (bioreactor) and a collecting tank were connected in sequence.

First, the landfill leachate was transported from the landfill to the flow adjustment tank, and the supernatant of the flow adjustment tank was introduced into the bioreactor at 25 to stay for 5 days. At this time, an anaerobic condition and an aerobic condition were alternately applied in the bioreactor every 2 hours. The leachate which passed through the bioreactor was stored in the collecting tank. At this time, the volume of the flow adjustment tank is 3.6, the volume of the bioreactor is 6 and the volume of the sump is 1. The temperature in the pilot plant was maintained at 25 during the process.

The leachate collected in the water collecting tank was discharged into a wetland as shown in FIG. The wetland is 1m in width, 2m in height, 0.5m in height, and the bottom slope is 2%. Artificial wetlands consisted of 50% of soil, 15% of clay, 20% of silt, and 65% of sand, and the reeds were planted on the surface. Under the surface layer was composed of a gravel layer 30 thickness. The leachate transported from the sump was then introduced at 30 / day for wetland 1, and the leachate passed through the wetland was discharged into the channel through a drainage pipe (formed with a diameter of 10 on 15 from the bottom of the gravel bed).

<Example 2>

The leachate was treated in the same manner as in Example 1 except that a drain pipe as shown in Fig. 3 was used. Specifically, the drain pipe (formed with a diameter of 10 on the 15 from the bottom of the gravel layer) was bent vertically in the channel portion and extended to the bottom of 10 centimeters from the ground. A first drain hole is provided at the bent portion of the drain pipe, and a second drain hole is provided at a vertically extending portion of the drain hole, and the leachate is discharged through the second drain hole by blocking the first drain hole.

&Lt; Comparative Example 1 &

The landfill leachate was treated in the same manner as in Example 1, except that the leached water was not filtered into the constructed wetland.

Comparative Example 2

The landfill leachate was treated in the same manner as in Example 1, except that the landfill leachate was directly filtered through an artificial wetland without being subjected to a pretreatment in the pilot plant.

&Lt; Evaluation example &

Examples 1 and 2 and Comparative Examples 1 and 2 after the leachate is treated to measure the concentration (/) of CCOD, BOD, SS, NH4N, NOxN is shown in Table 1 below. The COD is a measurement of the chemical oxygen demand by potassium dichromate, BOD is the biological oxygen demand, NH4N is the ammonia nitrogen, NOxN is the concentration of nitrite nitrogen and nitrate nitrogen, and SS is the concentration of suspended substance It is the value analyzed by Standard Methods of USA. In Korea's environmental pollutant process test method, the COD measurement is measured by potassium permanganate and is much smaller than the COD value by the above method. NBD (refractory COD) is determined by calculation with COD = COD- 1.7BOD. Here COD is also a measure of potassium dichromate.

Meanwhile, in the present invention, the structure of the outflow pipe described above is improved as follows so that the leachate flows out evenly to the constructed wetland.

Figure 5 is a side view showing the overall appearance of the outlet pipe according to an embodiment of the present invention, Figure 6 is a perspective view showing a branched structure of the outlet pipe according to an embodiment of the present invention, Figure 7 is another embodiment of the present invention FIG. 8 is a cross-sectional view illustrating a branch structure of the outlet pipe and a blocking plate blocking one branch pipe, FIG. 8 is a cross-sectional view illustrating various embodiments of the present invention, and FIG. 9 is a plan view of the outlet pipe according to the embodiment of the present invention. It is the top view shown.

Referring to FIG. 5, an outflow pipe 210 for discharging leachate from the collection tank to the constructed wetland 200 is shown. The outflow pipe 210 is composed of three kinds of blocks.

That is, the outflow pipe 210 is composed of a corrugated pipe which can bend in any direction, a straight pipe having a straight line with a wheel on its bottom so as to move in a straight line, and a straight pipe with a straight air pipe sealed in the bottom surface, .

Leachate is discharged through the outlet pipe 210, the purified water is drained through the drain pipe (240).

In the present invention, the outflow pipe 210 is configured to have a plurality of branch pipes branched in various paths in order to prevent degradation of the artificial wetland 200.

Therefore, the leachate is branched to several points through one supply pipe and a plurality of branch pipes, and how many branch pipes are implemented depends on the area of artificial wetland, etc. The first case is composed of one supply pipe and three branch pipes. Let's take a look.

As shown in Fig. 6, a corrugated pipe 2101 that can be bent in any direction is provided, and a rectangular square plate 2102 fixed at both ends thereof so as to communicate with the corrugated pipe 2102 is provided.

The rectilinear tube 2111 is connected to the rectilinear tube 2111 so as to communicate with the rectilinear tube 2111. The rectilinear tube 2111 has three sides of the rectilinear tube 2102, (Not shown).

A semi-circular tube support 2131 for supporting and fixing the straight tube 2111 and a rectangular floating body 2161 filled with compressed air therein is provided.

The leachate is branched from the straight pipe 2111.

To this end, one supply pipe 2172 with a square plate and a branch body 2171 in which the first to third branch pipes 2173, 2174 and 2175 with the square plate protrude in all directions are provided.

The branch body 2171 may also have a rectangular floating body 2161 filled with compressed air therein so that it floats in water, that is, floats in artificial wetlands.

The branched structure of the leachate treatment apparatus as described above may have a polygonal shape, that is, an N-shape (N is a natural number of 3 or more). Thus, there may be various forms.

That is, the branch structure of the outlet pipe may have a branch body in which one supply pipe and a plurality of branch pipes protrude in each direction may have a polygonal shape. For example, triangular, tetragonal, pentagonal, hexagonal, octagonal, and octagonal can be configured, where the number of branch tubes is two, if triangular, three, five If it is a rectangular shape, it will be four.
In summary, the N-shape (N is a natural number of 3 or more), and the number of branch pipes is N-1.

In addition, as illustrated in FIG. 7, one branch pipe may be unnecessary among the plurality of branch pipes. In this case, one branch hole of the branch body 2171 may be provided with a blocking plate 2171 that may block the leachate from flowing down. To prevent leakage of leachate.

The structure of the blocking plate 2181 becomes a rectangular slot shape in which a hole passing from the square slot 2112 provided at both ends of the straight tube 2111 to the straight tube 2111 is blocked.

As shown in Fig. 8, the branched structure of the outlet pipe may be triangular, rectangular, pentagonal, octagonal, or the like.

As shown in Figure 9, the outflow pipe structure as a whole consists of a straight pipe that can move the ground with wheels, a straight pipe floating in water with compressed air, a corrugated pipe connecting between the straight pipe, the branch body for branching the straight pipe.

The branch body may branch the straight tube with wheels, but the present invention exemplifies the branching of the straight tube floating in the water, since even distribution of the leachate is made in the artificial wetland.

200; Artificial wetland 210; Outflow tube
220; Artificial wetland 240; drain
2101; A corrugated pipe 2102; Square plate
2111; Straight tube 2112; Square slot
2131; Tube support 2161; Floating body
2171; Branch body 2172; Feeder
2173; First branch pipe 2174; 2nd branch pipe
2175; Third branch pipe 2181; Blocking plate

Claims (3)

Flow control tank to control the amount of leachate flowed into the landfill leachate, bioreactor to nitrate the leachate by alternating anoxic-aerobic conditions to reduce the load of organic matter and nitrogen, the inflow through the bioreactor A catchment tank for removing suspended solids and sediments from the leachate, and a downflow artificial wetland consisting of a surface layer and a gravel layer to remove hardly decomposable COD and NOXN from the leachate introduced through the catchment, and having a partition wall so that the leachate does not flow out. In the leachate treatment apparatus having a divergible distribution device, which is formed in the gravel layer of the artificial wetlands and has a channel through which the leachate is discharged through a drain pipe having an opening and closing means in the drainage port.
Outflow pipe for outflowing the leachate from the sump to the downflow artificial wetland
Corrugated pipe that can be bent in any direction, consisting of a rectangular square plate fixed to both ends to communicate with the corrugated pipe 1) Corrugated pipe configuration, a straight tube which is a circular tube in a straight direction, is fixed to both ends to communicate with the straight pipe Square slot accommodated while the three sides of the square plate of the corrugated pipe is fitted, a semi-circular pipe support for supporting and fixing the straight pipe, a rectangular moving body for supporting the pipe support from the bottom, fixed to the bottom of the moving body 2) a straight tube structure with moving wheels, a straight tube which is a straight circular tube, fixed to both ends thereof so as to be in communication with the straight tube, and the square of the corrugated pipe Square slot to accommodate the three sides of the plate is inserted, semi-circular tube support for supporting and fixing the straight pipe And 3) the compressed air is filled straight tube made of a floating body on the compressed air is filled inside the square configuration, a single supply line and the plurality of branch pipes made of a 4) branch body projecting in each direction;
The 1) corrugated pipe configuration is coupled to each other in the 2) a straight pipe configuration with moving wheels or 3) a straight pipe configuration filled with compressed air, the 2) a straight pipe configuration with a moving wheel or 3) the compressed air is filled Straight pipe configuration is coupled to each other and a square plate in the 4) main body;
2) a straight pipe configuration with moving wheels is disposed on the ground, and 3) a straight pipe configuration filled with compressed air is disposed on the water surface;
4) The branch body in which one supply pipe and the plurality of branch pipes protrude in each direction is N-shaped (N is a natural number of 3 or more), and the number of branch pipes is N-1, and each of the supply pipes and branch pipes is Leachate treatment apparatus having a branching distribution device characterized in that provided with a square plate.
The method according to claim 1,
The drain pipe communicates in parallel with the ground surface in the artificial wetland and is bent and extended in a vertical direction with respect to the ground surface extending from the artificial wetland toward the ground in the waterway, and includes a first opening and closing means in a portion curved in the vertical direction. A leachate treatment apparatus having a branchable dispensing device including a second drainage port at a position where the drainage port is formed and extends in a vertical direction. delete

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