KR20070047731A - Method for purifying leachate of landfill and dewatering water of food waste - Google Patents

Abstract

The present invention is a method for efficiently and economically purifying the leachate generated in the household waste landfill and the food waste treatment process, the process of mixing the food waste desorbent with the landfill leachate to a level suitable for nitrogen treatment, Pretreatment process consisting of anaerobic digestion process, denitrification / nitrification process to remove nitrogen and organic substances, chemical agglomeration process to remove remaining hardly decomposable organic substances using ferric sulfate, powdered activated carbon and ferric sulfate, hydrogen peroxide Oxidation agglomeration process is carried out sequentially to remove chromaticity by simultaneously inputting water, and by treating food waste desorption liquid containing high concentration nitrogen and hardly decomposable organic substances, which are mainly treated for ocean discharge, by combining with leachate. High cost in leachate treatment An external carbon source (methanol) to significantly reduce the use cost while having a high processing efficiency, and also provides an efficient and economical purification treatment method which can prevent the marine pollution caused by marine emissions of Food talriaek.

Landfill Leachate, Purification Method

Description

Method for Purifying Leachate of Landfill and Dewatering Water of Food Waste}

1 is a flow chart of the overall purification treatment step of treating the food waste waste desorbent and the leachate of domestic garbage landfill in accordance with the present invention

2 is an oxidation coagulation treatment process for simultaneously injecting powdered activated carbon and a chemical agglomeration treatment process to remove hardly decomposable COD and chromaticity remaining in treated water sequentially undergoing anaerobic digestion and denitrification / nitrification treatment.

The present invention relates to a purification treatment method that can ensure efficiency and economic efficiency by mixing the leachate of domestic waste landfill containing high concentration of nitrogen with the desorption liquid generated during the food waste treatment (food waste) process.

In general, unlike general household sewage that maintains almost constant water quality, the leachate generated from domestic garbage landfill has various water quality characteristics according to the type and quantity of landfill, landfill type and method, rainfall, climatic conditions, and compaction. In particular, as the landfill period elapses, the organic material gradually decreases and is converted into a difficult biodegradable state, while nitrogen is increased, making it difficult to properly treat a single treatment process.

Looking at the method of purifying the landfill leachate of household waste, it is common to apply a treatment method by microorganisms for the effective treatment of the high concentration of nitrogen contained in the leachate, the concentration ratio of organic matter and nitrogen for the nitrogen treatment by the microorganisms (BOD / TN) should be maintained at least 3 to 5, but most of the landfill leachate that has been aged for more than 3 years has a very low concentration ratio of less than 1, and a large amount of organic carbon source must be supplied for proper nitrogen treatment. Methanol, which is generally used as an organic carbon source, is expensive and has a problem in that an overall leachate treatment cost is increased. In addition, since the BOD / COD ratio, which indicates the bioavailability (degradation by microorganisms), is maintained at 0.4 or more and the organic matter concentration is shown at an initial stage 1 to 2 years after the start of the landfill, However, as the landfill time passes, the nitrogen concentration increases due to the ammonia nitrogen produced during the decomposition of raw waste, but the organic concentration is lowered by the natural decomposition reaction in the landfill itself, and biological treatment is possible even in terms of the total organic matter composition. While the share of organic materials decreases, the share of difficult-decomposable organic materials increases, making it difficult for normal nitrogen treatment by microorganisms.

As a technique to solve this problem, a technique for removing nitrated nitrogen using an organic carbon source contained in the wastewater introduced into the sump is described in Korean Patent No. 432645, but the organic carbon source in the wastewater is insufficient in organic matter (BOD) alone. It was not possible to remove nitrogen sufficiently, and in addition, a technique of introducing methanol as an external carbon source in order to compensate for an insufficient organic carbon source in waste water is described in Korean Patent No. 436043. The price is high and the price is high, which is the main reason for the overall increase in leachate treatment costs.

Accordingly, the use of waste TPA, sugar waste liquor, etc., which can replace expensive methanol as an external carbon source for removing nitrogen contained in leachate using microorganisms, has been studied. In order to use it as well as a separate storage and dissolution apparatus, there is a problem that requires a rise in pH through input of a certain amount of caustic soda (NaOH) even when dissolved. In addition, since the amount of sugar waste liquid generated is small, it is difficult to supply a stable supply, it is necessary to install a separate supply facility, there is a problem that the color is increased due to the input of sugar waste liquid.

On the other hand, food waste leachate contains 100,000 mg / L BOD, 150,000 mg / L COD, 3,000 mg / L TN (total nitrogen) and 150,000 mg / L solids as shown in Table 1. The concentration is very high and the pollution is also very high compared to the landfill leachate.

Comparison of Food Logarisate and Leachate Water Quality division Food Waste Desorption Number of leaching sources (maximum) Decontamination Contamination Compared to Leachate (Times)  pH 4.3 6.2 -  BOD 105,000 25,000 4.4 COD _Cr 175,000 35,000 5.0  Suspended solids 150,000 3,000 50  T-N 3,300 800 4.1 NH ₄ ⁺ -N 400 500 -  T-P 530 20 26 Salinity (Cl ^-) 7,900 5,000 1.6

The food waste desorption liquid was analyzed as a mixture of the desorption liquid generated in the treatment process such as storage feet, primary and secondary dehydration liquids, and centrifugal concentrator.

When the biological waste treatment method such as anaerobic digestion, activated sludge, etc. used in the conventional treatment of livestock waste, manure, leachate, etc. is used as a treatment method of the food waste desorbing liquid, acid fermentation bacteria, methane-producing bacteria, etc. As well as anaerobic digestive bacteria, there are problems that it is difficult to maintain proper growth conditions of aerobic microorganisms such as aerobic bacteria, nitrosomonas, and nitrobacter. In addition, there is a problem that it is difficult to maintain the oxygen concentration of 3 ~ 5 mg / L required for aerobic microorganism treatment due to the solids of 150,000 mg / L, and more than 3,000 mg / L in biological treatment water such as anaerobic digestion and activated sludge Treatment of detachment from food waste alone by conventional treatment methods such as chemically coagulation and oxidation, activated carbon adsorption, and reverse osmosis treatment methods due to difficult decomposition COD and color residue of more than 1,000 degrees It is very difficult. Therefore, most of the food waste desorption liquid is discharged to the ocean, and in case of small amounts, it is processed on land using treatment methods such as evaporative concentration, but problems such as marine pollution when discharging the ocean are pointed out, and regulations on this are reinforced. There is a problem that, in the case of land treatment, there is a problem that excessive processing cost of 200,000 ~ 300,000 won per ton.

The present invention reduces the cost of using methanol generated during the leachate treatment process by treating the landfill leachate with food waste waste leachate, and further improves the landfill leachate that can prevent marine pollution due to marine discharge of the leachate. Provided is a method for the combined purification of food waste waste leaving liquid.

Specifically, the food waste desorption liquid used as an organic carbon source in place of methanol in the present invention contains a large amount of organic substances that facilitate biodegradation even though the content of harmful substances such as heavy metals is very low, and leachate generated from landfills of household waste Since the liquid phase is similar to the liquid phase, the leachate can be directly used as an external carbon source without the need for a separate pretreatment facility in the leachate treatment process of landfills. Therefore, high efficiency leachate treatment efficiency can be expected at low cost.

Accordingly, an object of the present invention is to reduce the pretreatment cost by directly using the food waste desorption liquid containing a high concentration of organic materials and having a similar state to the leachate of landfill landfill, which does not require a separate pretreatment facility, and at the same time, external carbon Combined purification method of low-cost and high-efficiency household waste landfill leachate and food waste desorption solution that drastically reduces the cost of expensive leachate treatment when only leachate is treated by using high concentration of organic materials contained in the leachate instead of methanol. To provide.

Another object of the present invention, there is a difficulty in land treatment due to the high concentration in the meantime, by allowing food waste waste detachment liquid discharged to the sea due to the high cost during the land treatment can be processed at low cost, food logistics in addition to the cost reduction effect The present invention provides a method for purifying and treating waste landfill leachate and food waste desorption solution that can also solve the marine pollution problem caused by marine discharge of waste desorption liquid.

In order to achieve the above objects, the present invention has been developed in the process of treating leachate and food waste generated from landfills with very low organic matters (BOD, COD 500 mg / L or less) that can be decomposed by microorganisms after at least 5 years. Anaerobic digestion process that combines the desorption solution containing more than 150,000 mg / L of COD and suspended solids and more than 3,000 mg / L of nitrogen to the appropriate level for nitrogen treatment, and digests the mixed leachate and desorption solution to the level suitable for denitrification / nitrification Ferric sulfate, a coagulant, which is difficult to decompose in biodegradable organic substances remaining in the treated water which has undergone the denitrification / nitrification process that removes nitrogen by using residual organic materials through the digestion process and anaerobic digestion process. Chemical agglomeration process and ferric sulfate to remove and precipitate by adding a polymer coagulant of anion type as a coagulant aid The present invention provides a method for the combined purification and treatment of domestic waste landfill leachate and food waste desorption solution, which is performed by sequentially adding hydrogen peroxide and powdered activated carbon to remove the organic matter and color remaining in the chemical coagulated water.

In the above purification process, the chemical coagulation process using ferric sulfate is performed before the oxidation coagulation step to effectively remove the hardly decomposable organic substance and the color, and to increase the reactivity of the hydrogen peroxide solution as the oxidant in the oxidation coagulation step. By replacing ferrous sulfate, which has been used as ferric sulfate, COD and chromaticity show similar treatment efficiency as ferrous sulfate, but improve sedimentation of sludge, lowering the concentration of suspended solids in treated water, and adding powdered activated carbon. It is another object of the present invention to significantly reduce the suspended solids, COD, and chromaticity.

The features of the present invention will be more clearly understood by the following detailed description based on the accompanying drawings.

The accompanying drawings show a specific embodiment of the leachate purification treatment method of landfills according to the present invention, Figure 1 is a total treatment process of the collection tank, anaerobic digestion process, denitrification / nitrification process, chemical coagulation process This shows the oxidation coagulation process.

As shown in FIG. 1, the desorption liquid generated in the food waste treatment process is collected from the desorption liquid storage tank 1 to the mixed collection tank 5, and the leachate generated in the household waste landfill is extracted in the extraction pipe 3 and the transfer pipe 4. The leachate mixing step (5) is carried out so that the water is collected by the mixing tank (5) and mixed. In other words, it is an important feature of the present invention to perform a process of mixing a high concentration of food waste desorption liquid and leachate of 5 years or more of landfill generated from domestic waste landfill and performing anaerobic digestion (6).

In particular, anaerobic digestion is performed after mixing leachate with poorly degradable organic matter and domestic waste landfill leachate with high nitrogen content and food waste degreasing solution with high organic matter content and low nitrogen content in a ratio of 1 to 0.8 to 1.2. Through a series of processes to control the concentration of organic matter and nitrogen (BOD / NH ₄ ⁺ -N) ratio is maintained at a ratio of 4.5 ~ 5.5 to 1, therefore, in the conventional denitrification / nitrification process (7) It is possible to achieve the purpose of nitrogen treatment through the denitrification / nitrification process without introducing an expensive external carbon source such as methanol, which had to be separately added.

The anaerobic digestion process and the denitrification / nitridation process as described above will be described in more detail.

The anaerobic digestion process (6) is a process for causing the digestion of the organic matter contained in the mixed water of the leachate and the leachate introduced into the digester by the anaerobic microorganism consisting of acid-producing bacteria and methane-producing bacteria under the anaerobic conditions, Clostridum, Peptococcus Acid-producing bacteria composed of anaerobus, etc. first decompose organic substances to produce organic acids and alcohols such as butyric acid, lactic acid and acetic acid, and the generated organic acids and acetic acid are added to methane-producing bacteria. Finally decomposes into CH ₄ and CO ₂ .

The specific operation method for the anaerobic digestion tank is to put the leachate mixed with leachate at a ratio of 0.8 to 1.2 in the digester and then digest it for 10 days at 32 to 38 ℃, which is a medium temperature digestion temperature. Through the process, 60 ~ 70% of the organic substance contained in the desorption liquid is removed, and the organic nitrogen in the form of protein in the desorption liquid is converted into ammonia nitrogen (NH ₄ ⁺ -N) to It controls the concentration of organic material and nitrogen (BOD / NH ₄ ⁺ -N), which is a level suitable for denitrification / nitrification, to be maintained at a ratio of 4.5 to 5.5 to 1.

In the denitrification / nitridation process (7), first, the leachate introduced into the denitrification tank in ammonia nitrogen state is introduced into the nitrification tank installed at the rear stage and oxidized to nitrate nitrogen, and the nitrate nitrogen is returned to the denitrification tank installed at the front end to denitrification bacteria. It is a process of degassing and removing it into the atmosphere by nitrogen gas. In the biological nitrification process, ammonia nitrogen is oxidized to nitric acid by nitrifying microorganisms composed of Nitrosomonas and Nitrobacter.

^{_{· NH 4 + + 1.50 2 →}} 2H + + H 2 O + NO 2 - + 58 ~ 84 Kcal → Nitrosomonas

^{_{· NO 2 - + 0.50 2 →}} NO 3 - + 15 ~ 21 Kcal → Nitrobacter

Also, biological denitrification is the NO ₂ generated in the nitrification process ^-, NO ₃ ^-, etc. In the oxygen-free state in a step of finally released to the atmosphere reduced to N ₂ or N ₂ O, NO, etc., using as an electron acceptor instead of oxygen, The denitrification reaction that occurs when a carbon source is present

^{_{· NO 3 - + 1/3 CH 3}} OH → NO 2 - + 1/3 CO 2 + 2 / 3H 2 O

^{_{· NO 2 - + 1/2 CH 3}} OH → N 2 + 1/2 CO 2 + 1/2 H 2 O + OH -

^{_{· NO 3 - + 5/6 CH 3}} OH → 1/2 N 2 + 5 / 6CO 2 + 7 / 6H 2 O + OH -

Proceed as follows, the amount of methanol required to reduce 1 g of NO ₃ ^-- N is about 1.9 g (2.869 gCOD).

In the above process of the present invention, however, the mixed solution of the leachate and the leachate treated to maintain the concentration of organic matter and nitrogen (BOD / NH ₄ ⁺ -N) at a ratio of 4.5 to 5.5 to 1 in the anaerobic digestion process without additional methanol injection. This can be said to be the biggest feature of the present process, it is possible to remove nitrogen to an average of 90% through the present process configured as described below.

Looking at this process in more detail, the denitrification / nitrification reaction tank consists of a total of seven reaction tanks, including the denitrification tank (7-1) installed in two tanks and the nitrification tank (7-2) installed in five tanks, denitrification / nitrification reactor In order to maintain a constant concentration of microorganisms of about 8,000 ~ 12,000 mg / L always requires a recycling from nitrification tank to denitrification tank. In other words, the recycling of the microorganisms concentrated in the settling tank (7-3) is called external transfer, and the external transfer rate is 100 to 200% based on the amount of inflow into the denitrification / nitrification reactor to prevent excessive surface area load of the settling tank. The recycling carried out from the nitrification tank (7-2) to the denitrification tank (7-1) is called internal conveyance. The internal conveyance rate is the inflow that enters the denitrification / nitrification reaction tank considering the pump's installation capacity and the maximum denitrification rate. Based on the quantity, up to 700 to 900%.

The denitrification / nitrification reaction tank is the most important process in this process. In order to maintain the nitrification rate and the denitrification rate constantly, the microorganisms living in the reaction tank must always maintain the optimal state. It is important to install. First of all, the most important water temperature for the growth of the microorganisms in the denitrification / nitrification tank should not exceed the maximum limit of denitrification / nitrification microorganisms in the summer of 43 ℃ and always keep the minimum 25 ℃ even in the winter. In order to maintain the proper water temperature, the denitrification reactor and the nitrification reactor are installed in a concrete structure, and the opening and closing opening of about 5% of the cover area is installed on the upper part, so that the opening is opened when the water temperature rises in the summer and closed in the winter. Always keep the proper water temperature. In addition, the depth of the reaction tank is 6.5 ~ 7.5 m, of which 5 to 6 m is to be installed underground, and the height of the water surface and the upper part of the cover is maintained above 1.5 ~ 2.0 m to prevent the temperature drop in winter. By installing only an agitator in the denitrification tank to maintain anoxic conditions with a dissolved oxygen concentration of 0.5 mg / L or less, it is easy to reduce nitrogen nitrate to nitrogen gas (N ₂ or N ₂ O) and supply sufficient oxygen to the nitrification reactor. In order to facilitate contact between microorganisms and contaminants, a mechanical stirrer and an acid pipe for air supply are installed at the same time to maintain the dissolved oxygen concentration at 3 to 5 mg / L. The treated water that has undergone the denitrification / nitridation process is sequentially introduced into the chemical agglomeration process.

The chemical coagulation process (8) is a process for treating hardly decomposable organic substances, colors, and suspended solids remaining in the treated water which has undergone the denitrification / nitrification process. Hazardous sulfuric acid (H ₂ SO ₄ ) is added and at the same time the coagulant ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) 300 ~ 350 mgFe ^{3 +} / L based on trivalent iron (Fe ³⁺ ) and 15 ~ 25 A rapid stirring process of about 150rpm is carried out for about 5 minutes, and 5 ~ 15 mg / L of anionic coagulant as a coagulant is added to the treated water mixed with ferric sulfate, which is about 50 rpm for 6 to 14 minutes. After slow stirring to about 2 hours, the reaction water mixed with ferric sulfate and the polymer coagulant was precipitated for 2 hours, and the precipitated sludge was dehydrated, and the supernatant water (treated water located on the upper side) was introduced into the oxidation coagulation process in a natural flow method.

Oxidation coagulation process (9) is a process for removing hardly decomposable organic substances and colors remaining in the treated water after the chemical coagulation process, ferric sulfate, hydrogen peroxide and pH regulator (sulfuric acid) in the treated water undergoing the chemical coagulation process At the same time to keep the reaction pH in the range 3 ~ 4 and rapidly stirred at about 150rpm for 3 to 4 hours. At this time, ferrous sulfate is added at a concentration of 200 to 300 mgFe ²⁺ / L based on trivalent iron (Fe ³⁺ ), and hydrogen peroxide is added at a concentration of 50 to 70 mgH ₂ O ₂ / L to induce an oxidation reaction. . In addition, 200 ~ 300 mg / L of powdered activated carbon (Φ 0.1mm or less) is added together in a rapid reaction tank into which ferric sulfate and hydrogen peroxide water are added to increase the reactivity and increase the sedimentation of the sludge. After the reaction process, the caustic soda (NaOH) is used to undergo a neutralization step so that the pH is maintained in the range of 6-7, and anion polymer, which is a coagulant aid of anion system, is stirred at about 50 rpm. Add ~ 15 mg / L to increase the sedimentation of sludge. In this way, by adding powdered activated carbon simultaneously, suspended solids are reduced by 50 to 70%, 5 to 7 mg / L, COD is reduced by 50 to 60%, 50 to 60 mg / L, and chromaticity is reduced by 80 to 90%. It is lowered to a degree, and the reaction time of about 30 minutes is sufficiently increased to 3 to 4 hours, thereby adversely affecting the residual hydrogen peroxide water generated during the oxidation coagulation reaction (precipitation of precipitated sludge, organic treatment of treated water). Material increase, etc.) The sludge precipitated through this process is dehydrated through the concentration process, and the supernatant water (treated water located on the upper side) is discharged through the final treatment tank.

As shown in Table 2 below, the treatment efficiency of the non-degradable organic substance was 99.5% and nitrogen was treated using the present invention by treating the wastewater mixed with the food waste leachate containing leachate and the leachate containing the highly concentrated non-degradable organic substance and nitrogen. The treatment efficiency was found to be very high at 95.5%, which means that the present invention shows a higher treatment efficiency than the conventional leachate purification method using methanol as an organic carbon source.

 Item division Yu can Number of treatments Processing efficiency (%) When using only methanol When mixed with desorption solution When using only methanol When mixed with desorption solution When using only methanol When mixed with desorption solution BOD (mg / L) 1,000 30,000 6 6 99.4 99.9 CODcr (mg / L) 2,000 40,000 210 180 89.5 99.5 T-N (mg / L) 1,500 2,000 130 90 91.3 95.5

The analysis method of the BOD, CODCr, T-N was analyzed by the environmental pollution process test method announced by the Ministry of Environment.

The present invention contains the leachate of domestic garbage landfill and high concentrations of non-degradable organic substances and nitrogen so far in the treatment of food waste desorption liquid which has been discharged to the ocean as a major cause of marine pollution due to the large amount of treatment cost. The most significant effect of this invention is the realization of low cost and high efficiency treatment by mixing these two types of high concentration malignant wastewater.

Specifically, the food waste desorption liquid can be used directly as an external carbon source in the leachate purification process of landfills in domestic wastes in a liquid state similar in appearance to the leachate, so that it can be directly used as an external carbon source. The cost can be reduced.

In addition, in the past, expensive methanol has been separately added as an organic carbon source for treating high concentration nitrogen, but in the present invention, the total amount of methanol is replaced with food waste leachate to be mixed and treated with leachate so that leachate treatment costs can be greatly reduced. Therefore, high efficiency leachate treatment efficiency can be expected at low cost. Reduction of the treatment cost realized through the present invention, as shown in Table 3 below, considering the amount (about 5,000 tons / day) of food waste degreasing solution generated in Korea at about 25,200 won per ton in terms of pure savings cost, The cost is estimated to be about 45 billion won per year.

Category Leachate Food Waste Desorption Remarks Existing treatment cost (KRW / ton) 4,500 30,000 Desorptions are ocean discharge costs Processing cost of the present invention (KRW / ton) 4,800 4,800 - Treatment cost savings (KRW / ton) -300 25,200 Net savings: 24,900

In addition, the present invention enables to effectively remove the hardly decomposable organic substances and chromaticity by performing a chemical agglomeration process using ferric sulfate in the pre-oxidation coagulation step, and to increase the reactivity of the hydrogen peroxide water as an oxidant in the oxidation coagulation process By replacing ferrous sulfate, which has been used as ferric sulfate, the sedimentation of sludge is improved, and the concentration of suspended solids in treated water is reduced by 20 to 30% (2 to 3 mg / L), while the COD and color are similar to those of ferrous sulfate. ~ 60% treatment efficiency. In addition, it is another effect of the present invention that the suspended solids, COD, and chromaticity are greatly reduced by adding powdered activated carbon during the chemical coagulation process.

Furthermore, the present invention enables land treatment of food waste waste desorbing liquids that have been discharged to the ocean due to high concentration and high cost, which can be solved at low cost. It's a breakthrough.

Claims (8)

In the household waste treatment landfill leachate treatment method, And a mixing process of mixing the leachate generated from the household waste landfill with the desorption liquid generated from the food waste. A mixing step of collecting and mixing the leachate generated from the food waste and the leachate generated from the landfill; An anaerobic digestion process for extinguishing and removing high concentrations of hardly decomposable organic substances in the mixed wastewater; A denitrification / nitrification process for removing nitrogen and hardly decomposable organic substances from the treated water after the anaerobic digestion process; A chemical flocculation step of flocculating and precipitating the residual organic material of the treated water which has undergone the denitrification / nitrification process; Oxidation coagulation process to remove residual organic matter and color in the treated water after the chemical coagulation process; Combined purification treatment method of the landfill leachate and domestic food waste leachate, characterized in that consisting of. The method of claim 2, The mixing step, A method for the combined purification and treatment of domestic waste landfill leachate and food waste waste leachate, characterized in that the leachate generated from landfill landfill and food waste are mixed in a ratio of 0.8 to 1.2. The method of claim 2, The anaerobic digestion process, Digestion and digestion by anaerobic microorganisms for 10 days at 32 ~ 38 ℃, which is a medium temperature digestion temperature, to adjust the concentration of organic matter and nitrogen (BOD / NH ₄ ⁺ -N) at a ratio of 4.5 to 5.5 to 1 Combined purification method for landfill leachate and food waste degreasing solution. The method of claim 2, The denitrification / nitrification process, While maintaining the denitrification / nitrification tank within the proper temperature range of denitrification / nitrification microorganisms, the organic matter contained in the food waste removal solution is used as an external carbon source, and the denitrification and nitrification reactions by denitrification and nitrification microorganisms are carried out. Combined purification treatment method of domestic waste landfill leachate and food waste waste leaching solution characterized in that the treatment. The method of claim 2, The chemical coagulation process, Sulfuric acid (H ₂ SO ₄ ) as a pH adjusting agent and ferric sulfate (Fe ₂ (SO ₄ ) ₃ ) as a chemical coagulant are added to undergo a rapid stirring process, and a polymer coagulant as a coagulant aid is added to precipitate slowly. Combined purification method for leachate from domestic garbage landfill and food waste leachate. The method of claim 2, The oxidation coagulation step, Ferric sulfate, hydrogen peroxide, and pH regulator (sulfuric acid) are added to the treated water after the chemical coagulation process at the same time to maintain the reaction pH in the range of 3 to 4, rapidly stirring at 150 rpm for 3 to 4 hours, and coagulation aid through the neutralization step. A method of combining and purifying a domestic waste landfill leachate and a food waste desorption solution, comprising adding a phosphorus anion-based polymer flocculant and slowly stirring the sludge. The method of claim 7, wherein The oxidation coagulation step, A method for the combined purification and treatment of domestic waste landfill leachate and food waste desorption solution comprising the addition of powdered activated carbon into a rapid reaction tank into which ferric sulfate and hydrogen peroxide water are introduced.

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