JP4197807B2 - Leachate load fluctuation mitigation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a landfill technique at a final disposal site for general waste, industrial waste, and the like, and relates to a leachate load fluctuation mitigation method.
[0002]
[Prior art]
The amount and quality of leachate at the final disposal site vary depending on the meteorological conditions such as landfill waste quality, rainfall, etc., landfill structure, size of landfill, size of water collection area, landfill period, waste landfill elapsed time, etc. The leachate at the landfill site is the leachate from the existing landfill section that has already passed through the landfill, the leachate from the new landfill section that has been short after the landfill, and the unfilled landfill area where there is no waste. The leachate discharged from the water is also collected centrally, and the entire amount is treated in the same process.
[0003]
[Problems to be solved by the invention]
For this reason, the scale and capacity of the treatment plant in the leachate treatment facility must be set for the total amount of precipitation falling on the disposal site, and in order to take into account fluctuations due to changes in weather conditions, When calculating the scale of a leachate treatment facility that treats water, it was inevitable that the facility would have a redundant capacity.
[0004]
However, the leachate varies greatly depending on the amount of rainfall, so when the rainfall is low, the operation of the leachate treatment facility stops continuously, while the pollution load increases when the rainfall is concentrated. However, the extreme cases where the leachate cannot be caught and the leachate is retained inside the disposal site are becoming normal.
This invention solves an above-described subject, and it aims at providing the leachate load fluctuation | variation relaxation method which can average the water treatment load in a leachate treatment facility.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the leachate load fluctuation mitigation method of the present invention pretreats waste and then inputs it into a landfill site, stores leachate from the landfill site in a regulating tank, and In the treatment, waste is temporarily stored in the washing facility, and the waste is washed and washed in the washing facility to wash out the pollutant together with the washing waste water. The flowing waste water is stored in the waste water storage tank, and the waste water is stored in the waste water storage tank. Is quantitatively supplied to the leachate treatment facility, and the leachate is appropriately supplied from the adjustment tank to the leachate treatment facility. Treated as a treatment load, leachate with less pollutant flowing from the adjustment tank is treated as a variable temporary water treatment load.
[0006]
With the configuration described above, the amount of pollution brought into the landfill site is reduced by washing the waste as a pretreatment, and the absolute amount of pollutant contained in the leachate is reduced. Therefore, even if the amount of leachate changes due to changes in precipitation, the amount of change in the amount of pollution is small, and the influence of the change in temporary water treatment load that leachate has on the leachate treatment facility is small.
[0007]
On the other hand, sewage generated by pretreatment flows into the leachate treatment facility as a basic water treatment load at a constant amount of water and pollution every hour regardless of rainfall, so the leachate treatment facility is continuously operated at a certain level of operation rate. Can drive.
Therefore, the water treatment load in the leachate treatment facility is the sum of the basic water treatment load and the temporary water treatment load, and the fluctuation range is small and averaged.
[0008]
The washing water in the pretreatment can use the treatment water of the leachate treatment facility, and can also use the leachate flowing into the adjustment tank.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the landfill 1 has a drainage pipe 2, the drainage pipe 2 communicates with the adjustment tank 3, and the adjustment tank 3 is connected to the leachate treatment facility 4. The leachate treatment facility 4 includes a first coagulation sedimentation treatment facility, a biological treatment facility, a second coagulation sedimentation treatment facility, a sand filtration treatment facility, an activated carbon adsorption treatment facility, and the like.
[0010]
The first coagulation sedimentation treatment equipment removes calcium from the raw leachate water to prevent scaling of piping and pumps, and performs alkali coagulation sedimentation treatment using a calcium removal agent in combination. The biological treatment facility employs a catalytic oxidation type cyclic denitrification method, which uses microorganisms on the surface of the filler to decompose organic substances in raw water and remove nitrogen components. The second agglomeration and sedimentation treatment equipment agglomerates the pollutants in the biologically treated water with chemicals and removes gravity precipitates, and performs a weakly acidic agglomeration and precipitation treatment effective for removing COD and chromaticity components. The sand filtration facility captures and removes fine suspended solids remaining in the coagulated sediment treated water with a filter medium made of anthracite and quartz sand. The activated carbon adsorption treatment apparatus removes COD, chromaticity components, and the like by the strong adsorption ability of activated carbon. The treated water is discharged after the sterilization treatment or recycled as cleaning water described later.
[0011]
Waste 5 to be disposed of in landfill includes general waste from households, industrial waste from factories, incineration residues and incombustible waste from municipal waste incineration facilities. Rainwater that falls on the landfill site 1 penetrates the layer of the cover soil 6 and the layer of the waste 5 and flows out as leachate containing the organic pollutant components, SS, inorganic salts, etc. of the waste 5 and collects the drainage pipe 2 Then flows into the leachate treatment facility 4 through the adjustment tank 3.
[0012]
At the time of landfill disposal, the waste 5 is pretreated and then input to the landfill disposal site. In the pretreatment, the waste 5 is temporarily stored in the cleaning facility 7, and the cleaning water is showered in the cleaning facility 7 and washed with water. The pollutant of the washed out waste 5 is stored in the sewage storage tank 8 as sewage together with the cleaning waste water, and the sewage is quantitatively supplied from the sewage storage tank 8 to the leachate treatment facility 4 by a pump means or the like.
[0013]
In the leachate treatment facility 4, leachate with less pollutant flowing from the adjustment tank 3 is treated as a variable temporary water treatment load, and sewage with much pollutant flowing from the sewage storage tank 8 is treated as basic basic water. Process as processing load.
By performing pretreatment, the amount of pollution brought into the landfill site 1 is reduced, and the absolute amount of pollutant contained in the leachate is reduced. Therefore, even if the amount of leachate is changed, the amount of fluctuation is small. The leachate has little impact on the leachate treatment facility. On the other hand, since the sewage generated by the pretreatment flows into the leachate treatment facility 4 at a constant amount of water and pollution every hour regardless of rainfall, the leachate treatment facility should be operated continuously at a certain level of operation rate. Can do. Therefore, the water treatment load in the leachate treatment facility 4 is the sum of the basic water treatment load and the temporary water treatment load, and the fluctuation range is small and averaged. As the washing water, the treated water of the leachate treatment facility 4 can be used, and the leachate flowing into the adjustment tank 3 can also be used.
[0014]
【The invention's effect】
As described above, according to the present invention, the amount of change in the amount of leachate contamination that increases or decreases depending on the amount of precipitation is reduced by pretreatment, and the amount of sewage is fixed to the leachate treatment facility every hour regardless of the amount of rainfall. As the basic water treatment load flows in with the amount of water and pollution, the leachate treatment facility can be operated continuously at a certain level of operation rate, and the sum of the basic water treatment load and the temporary water treatment load is The fluctuation range is reduced and averaged, and fluctuations in water load at the leachate treatment facility can be mitigated.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a landfill disposal method in an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Landfill disposal site 2 Drainage pipe 3 Adjustment tank 4 Leachate treatment facility 5 Waste 6 Covering soil 7 Cleaning equipment 8 Sewage storage tank

Claims (1)

At the waste disposal site, the waste is temporarily stored in the washing facility and washed as a pretreatment, and the sewage flowing out after washing out the pollutants held in the waste is stored in the sewage storage tank, and the sewage is collected from the sewage storage tank. While supplying quantitatively to the leachate treatment facility, the pretreated waste is thrown into the landfill site, the leachate from the landfill site is stored in the adjustment tank, and the leachate is appropriately treated from the adjustment tank. The effluent with a large amount of pollutant that is supplied to the facility and flows from the sewage storage tank at the leachate treatment facility is treated as a regular basic water treatment load, and the leachate with a small amount of pollutant that flows from the adjustment tank is changed temporarily. A leachate load fluctuation mitigation method characterized by treating as a treatment load.

Images