KR100662880B1 - Purification system of waste landfills - Google Patents

Abstract

A system for purifying waste water of the waste landfills is provided to project the waste water into the waste landfills and to reduce the sludge treatment cost without a separate installation. A water interception wall(11) is installed at the inside of a waste landfill (10) so that the waste is reclaimed. The water interception wall prevents the discharge of the infiltrated water generated when corroding the waste. A drain net(13) is attached on the upper surface of the water interception wall. An infiltration water discharge tube(15) is installed at the center of the water interception wall. A side of the drain net is inserted into the infiltration water discharge tube so that the infiltration water is easily discharged toward the infiltration water discharge tube by the drain net.

Description

Leachate Purification System of Landfills {PURIFICATION SYSTEM OF WASTE LANDFILLS}

1 is a side view showing a leachate purification treatment system of landfills according to an embodiment of the present invention,

2 is an enlarged view of a portion “A” of FIG. 1.

♠ Explanation of symbols for the main parts of the drawing ♠

10: landfill 20: sump

30: first storage tank 40: sedimentation tank

50: first filtration tank 60: second storage tank

70: second filtration tank 80: sedimentation collection tank

The present invention relates to a leachate treatment system for landfills, and more particularly, to clean up leachate caused by corrosion of garbage and wastes buried in the underground and at the same time, reclaiming sludge and sediment generated during leachate purification. To a leachate treatment system for landfills that can be resupplyed and cleaned.

As industrialization is rapidly taking place, the generation of various industrial wastes is increasing every year. Also, as the living environment is rapidly changing and the proportion of instant foods is gradually increasing in the diet, household waste is also produced in large quantities. The disposal methods of household and industrial waste generated in this way are incineration methods of burning wastes and landfills of landfills at designated places.

In the case of waste disposal by incineration, the initial facility investment cost is high along with the limitation of the processing capacity, and the waste disposal by the landfill method is mostly occupied until recently due to the generation of harmful gases. Recently, various methods for stabilizing the landfills to be reclaimed have been attempted, and methods such as slurry walls, sheet pile, and landfill capping have been implemented.

Conventional landfill facilities install vertical order walls and embankments along the side circumference and deeply dig the bottom surface, and install the bottom order layer, and install the leachate collection pipe on the bottom order layer or install the bottom order layer inclined toward the sump. Leachate, such as wastewater from the buried landfill, is introduced into the sump along the leachate collection pipe or inclined bottom drainage layer, and the leachate temporarily stored in the sump is sent to a nearby sewage treatment plant through a transfer pipe for purification. After that, only purified water is discharged into the stream.

However, in order to treat both the leachate discharged from the landfill and general household sewage as described above, the pollution concentration of the leachate should be similar to the pollution concentration of the domestic sewage before introducing the leachate, which has a more serious pollutant concentration than the domestic sewage, to the sewage treatment plant. After adding a large amount of chemicals, it has to be introduced into the sewage treatment plant, so that the amount of chemicals is required, and accordingly, a large amount of sludge is generated, and thus the cost of treating the sludge is high.

The present invention is to solve the various problems of the prior art as described above, an object of the present invention is to install the leachate treatment facility in a position close to the landfill so that the sludge generated by the leachate can be re-injected into the landfill. Thus, to provide a leachate treatment system for landfills that can reduce the sludge treatment cost.

Another object of the present invention is to provide a waste landfill leachate treatment system that can easily discharge the leachate generated in the landfill to the outside of the landfill.

The leachate treatment system of landfills according to the present invention for achieving the above object is installed on the inner surface of the landfill so that the leachate generated by the waste is not discharged to the outside of the landfill, the drain network is installed on the bottom surface A central land portion comprising a landfill wall having a leachate discharge pipe installed therein; A leachate collection tank for collecting leachate generated in the landfill tank; A first storage tank into which the leachate flows in the leachate receiving tank and keeps the water quality and flow rate of the leachate constant; A settling tank for injecting aluminum sulfate and iron chloride to precipitate the suspended solids so that the suspended solids contained in the leachate flowing from the storage tank are aggregated and precipitated; In the settling tank is divided into first and second septic tank through the leachate so that the remaining suspended matter of the leachate introduced by the pump is removed, the first septic tank has activated carbon, the second septic tank has a purifying filter A built-in first filtration tank; A second storage tank for maintaining a constant water quality and flow rate of the leachate flowing through the first filtration tank; Activated charcoal and a purifying filter are built in each of the first and second septic tanks so as to remove suspended solids remaining in the leachate while the leachate flowing through the second storage tank is passed, and a pump to discharge the leachate passing through the second septic tank. It is characterized by consisting of a second filtration tank is provided.

Hereinafter, a preferred embodiment of the leachate purification treatment system of landfills according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figure 1, the landfill leachate treatment system of the landfill according to the present embodiment is provided with a landfill 10 having an order wall 11 is provided on the inner surface to bury the waste. The order wall 11 prevents the leachate generated when the waste is corroded to be discharged to the outside of the landfill 10, the bottom surface is formed to be inclined toward the center portion. A drain net 13 is attached to an upper surface of the order wall 11, and a leachate effluent pipe 15 in which one side of the drain net 13 is inserted is provided in the center portion. The leachate is easily drained to the leachate outflow pipe 15 by the drain network 13. The drain net 13 according to the present embodiment is preferably manufactured by a geotextile mat having excellent water permeability, and a nonwoven fabric and a split yarn are manufactured in a mat form so as to improve surface friction and resistance to tearing. It can also be made using a woven fabric. In addition, reinforcing fibers such as nylon, polypropylene, polyethylene, polyester, rayon and spandex may be added to improve resistance to cracking, resistance to heat change and heat shrinkage, and durability.

Leachate collected by the leachate outflow pipe 15 is introduced into the sump tank 20 through the drain pipe connected to the leachate outflow pipe 15, the leachate introduced into the sump tank 20 is the first storage tank 30 through the pipe line Flows into. Leachate introduced into the first storage tank 30 is introduced into the settling tank 40 while the water quality and the flow rate are kept constant by stirring.

In the settling tank 40, aluminum sulfate and iron chloride are added to the leachate to aggregate and precipitate suspended solids and organic matter contained in the leachate. When aluminum sulfate and iron chloride are added to the settling tank 40, the aluminum sulfate and iron chloride are stirred for 3 to 5 minutes to easily react with the suspended matter and organic matter. And the leachate which has been stirred with aluminum sulfate and iron chloride stops the flow for about 30 minutes so that the aggregates generated by the stirring, that is, the sludges are charged to the bottom of the settling tank (40).

Herein, aluminum sulfate and iron chloride added to the leachate are preferably added in an amount of about 80 to 100 mg per liter of leachate, and aluminum sulfate or iron chloride reacts with bicarbonate ions which affect the alkalinity of the leachate, thereby lowering the COD and pH of the leachate. . If aluminum sulfate and iron chloride are added at less than 80 mg per 1 l of leachate, the aggregation reaction is not effective, and when more than 100 mg per 1 l of leachate is added, it is uneconomical because more aluminum sulfate and iron chloride are added. In the present embodiment, aluminum sulfate and iron chloride were used as flocculants, but anionic polymer coagulants may be used. When using a polymer flocculant, it is preferable to add about 0.5 mg per ℓ of leachate.

Leachate from which suspended matter and organic matter have been removed from the settling tank 40 is discharged to the first filtration tank 50 by a pump 41 provided in the settling tank 40. The first filtration tank 50 is divided into first and second septic tanks 51 and 53, and the leachate flowing into the first filtration tank 50 passes through the second septic tank 53 via the first septic tank 51. Will pass. The activated carbon 51a is built into the first septic tank 51, and the purification filter 53 a is built into the second septic tank 53.

Leachate flowing into the first septic tank 51 is removed fine suspended matter not precipitated in the settling tank 40 by the activated carbon (51a) embedded in the first septic tank (51). The leachate introduced into the first septic tank 51 stops the flow for about 20 minutes so that the fines and organics can be removed by reacting with the activated carbon 51a. In the first septic tank 51, the leachate in which fine flotation and organic matter are aggregated is introduced into the second septic tank 53. In the second septic tank 53, aggregates in the leachate condensed in the first septic tank 51 are removed by the purifying filter 53a, and the removed sludge is settled below the second septic tank 53.

The leachate filtered in the first filtration tank 50 flows into the second storage tank 60 and flows into the second septic tank while maintaining the water quality and flow rate constant. The leachate introduced into the second storage tank 60 maintains constant water quality and flow rate by stirring.

Similar to the first filtration tank 50, the second filtration tank 70 includes first and second septic tanks 71 and 73 in which activated carbon 71a and a filtration filter 73a are built-in, respectively. The leachate is purified as it passes through (71, 73). Also in the second purification tank 73 of the second filtration tank 70, fine suspended matter and organic matter of the leachate are removed by the purification filter 73a and precipitated downward. The second purification tank 70 is provided with a pump 75 so as to discharge the purified leachate to the lawn, reed or swamp.

On the other hand, the sludge discharge portion 43, 57, 77 is provided below the second purification tank (53, 73) of the settling tank (40), the first and second filtration tank (50, 70) so that the precipitated sludge is discharged, Sludge discharged from each sludge discharge portion 43, 57, 77 is introduced into the sedimentation collection tank (80). Leachate and sludge introduced into the sedimentation collection tank 80 is discharged to the landfill 10 by a pump 81 built in the sedimentation collection tank (80). Reflowing the sludge into the landfill 10 should be equipped with a separate incineration facility to treat the sludge, by reflowing the sludge into the landfill 10, to reduce the dust and gas generated in the landfill, as well as the sludge This is to reduce reprocessing costs.

Referring to FIG. 2, the order wall 11 of the landfill 10 is composed of a clay layer 11a and a polyethylene layer 11b applied on the clay layer 11a. Since the clay layer 11a has lower permeability than general soil, even if the leachate leaks due to the breakage of the polyethylene layer 11b, the leachate is prevented from being absorbed into the soil. The clay layer 11a according to the present embodiment has a thickness t1 of 50 cm or more and a permeability coefficient of 10 to 7 cm / s or less. In addition, it is preferable that the polyethylene layer 11b is apply | coated so that the thickness t2 may have 2.5 mm or more.

On the other hand, the drain net 13 provided in the order wall 11 of the landfill 10 is attached on the polyethylene layer 11b.

In the above, preferred embodiments of the present invention have been described, but modifications and variations within the scope without departing from the technical spirit of the present invention by those skilled in the art belong to the scope of the present invention Of course.

As described above, according to the leachate treatment system of landfills according to the present invention, sludge generated in the sedimentation tank, the first and the second filtration tanks, that is, the leachate containing a large amount of sludge is collected in the sediment collection basin, By re-injection, it is not necessary to have a separate facility for the sludge treatment can reduce the sludge treatment costs. In addition, since the leachate containing a large amount of sludge is added to the landfill, there is an effect that can reduce the dust and gas generated in the landfill.

In addition, since the bottom of the order wall is formed to be inclined and the drain network is attached thereto, the leachate generated in the landfill is easily collected into the leachate outlet pipe.

Claims (3)

The landfill tank is installed on the inner surface of the landfill so that the leachate generated by the waste is not discharged to the outside of the landfill, and the center part comprises a landfill wall in which a leachate discharge pipe is installed, and a leachate collection tank in which the leachate generated from the landfill tank is collected. And, the leachate is introduced into the leachate receiving tank, the first storage tank for maintaining a constant water quality and flow rate of the leachate, and by adding aluminum sulfate and iron chloride so that the suspended solids contained in the leachate flowing in the storage tank is precipitated A sedimentation tank for precipitating the suspended solids, and a first and a second septic tank through the leachate so as to remove the remaining suspended matter from the leachate introduced by the pump from the sedimentation tank, and the first septic tank has activated carbon embedded therein. The first septic tank has a built-in purification filter Activated charcoal and purifying filters are provided to remove the suspended matter remaining in the leachate through a filtration tank, a second storage tank for maintaining a constant water quality and flow rate of the leachate flowing through the first filtration tank, and a leachate flowing through the second storage tank. In the leachate treatment system of landfills, each of the first and second septic tank, each of which is built-in, consisting of a second filtration tank provided with a pump to discharge the leachate after the second septic tank, The order wall is made of a clay layer and a polyethylene layer applied on the clay layer, and a drain network is provided on an upper surface of the polyethylene layer; The sludge discharge part is provided at the lower side of the sedimentation tank and the sanji first and second filtration tanks so that the precipitated sludge is discharged, and the sludge discharged from each sludge discharge part flows into the sedimentation collection tank and is embedded in the sedimentation collection tank. A leachate treatment system for landfills, characterized in that discharged to the landfill by a pump. delete delete

Images