WO2005000489A1 - Filling-up method of wet waste - Google Patents

Filling-up method of wet waste Download PDF

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Publication number
WO2005000489A1
WO2005000489A1 PCT/KR2004/001591 KR2004001591W WO2005000489A1 WO 2005000489 A1 WO2005000489 A1 WO 2005000489A1 KR 2004001591 W KR2004001591 W KR 2004001591W WO 2005000489 A1 WO2005000489 A1 WO 2005000489A1
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WO
WIPO (PCT)
Prior art keywords
wet waste
waste
treatment agent
water
acid
Prior art date
Application number
PCT/KR2004/001591
Other languages
French (fr)
Inventor
Sang-Kug Kim
Original Assignee
Sang-Kug Kim
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sang-Kug Kim filed Critical Sang-Kug Kim
Publication of WO2005000489A1 publication Critical patent/WO2005000489A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B1/00—Dumping solid waste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/20—Agglomeration, binding or encapsulation of solid waste
    • B09B3/25—Agglomeration, binding or encapsulation of solid waste using mineral binders or matrix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/02—Gases or liquids enclosed in discarded articles, e.g. aerosol cans or cooling systems of refrigerators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/16—Treatment of sludge; Devices therefor by de-watering, drying or thickening using drying or composting beds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/20—Waste processing or separation

Definitions

  • the present invention relates to a filling-up method of wet waste and, more particularly, to a filling-up method of wet waste using calcium oxide and/or burned dolomite .
  • BACKGROUND ART In recent, as the mass -production/mass -consumption system prevails, the amount of various waste is rapidly increasing. Among the various waste, wet waste, particularly food waste, is filled up in large part, because of the high cost of incineration. When the wet waste is filled up, leachate is generated from the wet waste.
  • the leachate from the filled up land has high BOD (biochemical oxygen demand ) and high COD (chemical oxygen demand) due to the spoilage organic compound in waste. And the leachate from the filled-up land also has a trace of heavy metal.
  • the amount of the leachate depends on the kind of waste, the area and the permeability of the filled up land but mainly depends on rainfall.
  • the leachate which comprises organic compound of high concentration
  • the river and the ground water may be contaminated.
  • a drying method in which food waste is dried by heating and a fermentation method in which the food waste is mixed with a sawdust and then the food waste is decomposed by bacterium are proposed.
  • the above methods require expensive apparatus and high operation cost .
  • the conventional method of treating the leachate from wet waste is to store the leachate and then treat it by simple chemical process.
  • this method is not environment-friendly and not cost effective.
  • the other • conventional method of treating the leachate is to recirculate the leachate in the filled up land.
  • this method requires complicated operation and facility, such as anaerobic digestion reactor and nitrification reactor.
  • Still the other conventional method of treating the leachate is to use microorganism.
  • all of the above conventional methods only disclose how to treat the resulting leachate but do not disclose how to prevent the generation of the leachate.
  • filling-up method of wet waste which reduces the leachate, thus decreases contamination and the cost of treating leachate.
  • DISCLOSURE OF INVENTION The foregoing and/or other aspects of the present invention are achieved by providing filling-up method of wet waste comprising: spreading a wet waste over a filled up land; spreading a treatment agent over the wet waste, wherein the treatment agent comprises at least one selected from the group consisting of calcium oxide and burned dolomite.
  • the amount of the treatment agent is 5-85wt% of the wet waste' s water.
  • the method further comprises spreading the treatment agent directly over the filled up land, wherein the amount of the treatment is more than 100wt% of the wet waste' s water.
  • the method further comprises spreading a acid after the spreading of the wet waste.
  • the amount of the acid is l-20wt% of the wet waste's water.
  • the acid comprises at least one selected from the group consisting of sulfuric acid, nitric acid, hydrochloric acid.
  • the wet waste may comprise, but not limited thereto, food waste, human and domestic animal's excrement, meat- industry waste, agricultural waste, fishery waste, and wastewater sludge.
  • the wet waste is filled up with treatment agent, which comprises at least one from the group consisting of calcium oxide (CaO) and burned dolomite (CaOMgO) .
  • treatment agent comprises at least one from the group consisting of calcium oxide (CaO) and burned dolomite (CaOMgO) .
  • CaO calcium oxide
  • CaOMgO burned dolomite
  • the mixing ratio of calcium oxide and burned dolomite is not limited.
  • Calcium oxide is formed by heating limestone and/or calcium carbonate to high temperature. Calcium oxide converts into calcium hydroxide (Ca (OH) 2 ) which is stable solid through hydration reaction with water. The hydration reaction is exothermic reaction. The heat from the exothermic reaction evaporates the water in the wet waste, thus reduces the water content of the wet waste.
  • calcium hydroxide is formed by reaction between calcium oxide and water, thus reduces the water content of the wet waste.
  • Burned dolomite is formed by heating carbonate of lime and/or calcium carbonate to high temperature and generally comprises magnesium oxide and calcium oxide. The mechanism of reducing the water content of the wet waste is similar to the case of the calcium oxide.
  • magnesium hydroxide Mg (OH) 2
  • the mixture of calcium oxide and burned dolomite also reacts with water in wet waste, thus removes water by heat from exothermic reaction and forming calcium hydroxide and magnesium hydroxide.
  • the treatment agent is referred to material that comprises at least one selected from the group consisting of calcium oxide and burned dolomite hereafter.
  • the amount of the treatment agent may be in the range of 5-85wt% of wet waste's water. When the amount of the treatment agent is less than 5% of the wet waste's water, the efficiency of preventing leachate is very low. When the amount of the treatment agent is more than 85wt% of wet waste's water, the efficiency of preventing leachate does not further improve and the filling-up capacity of the filled up land decreases. Although water in wet waste can be removed by mixing wet waste with the treatment agent, soil around the filled up land can be basified due to the resulting calcium hydroxide and/or magnesium hydroxide.
  • the reaction of acid and the treatment agent is also exothermic, and heat from this exothermic reaction accelerates the evaporation of the water in wet waste. And due to the increased temperature, the hydration reaction of the treatment agent is accelerated to decrease filling-up time.
  • the amount of acid may be in the range of l-20wt% of wet waste's water. When the amount of acid is less than lwt% of wet waste's water, the efficiency of preventing leachate and basification of soil is insufficient. When the amount of acid is more than 20% of wet waste's water, the soil can be rather acidified and the efficiency of preventing leachate does not further improve due to the undue amount of water in acid.
  • FIG. 1 is a schematic diagram according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram according to another embodiment of the present invention.
  • FIG. 1 is a schematic diagram according to an embodiment of the present invention.
  • a treatment agent layer 1 is spread over the bottom surface 4 of the filled up land.
  • the amount of the treatment agent layer 1 over the bottom surface 4 of the filled up land may be over 100wt% of water in wet waste layer 2, thus prevents the soil contamination for certain.
  • Wet waste layer 2 is spread over the treatment agent layer 1.
  • FIG. 2 is a schematic diagram according to another embodiment of the present invention.
  • the method of filling up wet waste is similar to the method in Fig. 1, such as the bottom surface 40 of the filled up land, treatment agent layer 10, and wet waste layer 20.
  • the difference is to add acid by amount of l-20wt% of the water in wet waste layer 20 after spreading the treatment agent.
  • This method also does not require mixing process, thus is very convenient.
  • the filling-up sequence is wet waste, treatment agent, and acid in above description
  • the aspect of the present invention can be achieved by various other modifications. Examples are as following: the filling-up sequence may be wet waste, acid and treatment agent. Acid may be added after physical mixing of wet waste and treatment agent. Treatment agent may be added after physical mixing of wet waste and acid. Wet waste, treatment agent, and acid may be mixed altogether.
  • the present invention will be explained in detail through experiments. But the present invention is not limited to the experiments.
  • experiment 1> At first 3ton of calcium oxide was spread over soil by thickness of 70cm. And then, food waste of which water content was 88.5wt% was spread over the calcium oxide by thickness of 50cm.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

A filling-up method of wet waste comprises, spreading a wet waste over a filled up land, spreading a treatment agent over the wet waste, wherein the treatment agent comprises at least one selected from the group consisting of calcium oxide and burned dolomite. The generation of leachate from the filled up wet waste can be prevented using simple method.

Description

FILLING-UP METHOD OF WET WASTE FIELD OF THE INVENTION The present invention relates to a filling-up method of wet waste and, more particularly, to a filling-up method of wet waste using calcium oxide and/or burned dolomite . BACKGROUND ART In recent, as the mass -production/mass -consumption system prevails, the amount of various waste is rapidly increasing. Among the various waste, wet waste, particularly food waste, is filled up in large part, because of the high cost of incineration. When the wet waste is filled up, leachate is generated from the wet waste. The leachate from the filled up land has high BOD (biochemical oxygen demand ) and high COD (chemical oxygen demand) due to the spoilage organic compound in waste. And the leachate from the filled-up land also has a trace of heavy metal. The amount of the leachate depends on the kind of waste, the area and the permeability of the filled up land but mainly depends on rainfall. When the leachate, which comprises organic compound of high concentration, is not properly treated, the river and the ground water may be contaminated. TO solve this problem, a drying method in which food waste is dried by heating and a fermentation method in which the food waste is mixed with a sawdust and then the food waste is decomposed by bacterium are proposed. However, the above methods require expensive apparatus and high operation cost . The conventional method of treating the leachate from wet waste is to store the leachate and then treat it by simple chemical process. However, this method is not environment-friendly and not cost effective. The other • conventional method of treating the leachate is to recirculate the leachate in the filled up land. However, this method requires complicated operation and facility, such as anaerobic digestion reactor and nitrification reactor. Still the other conventional method of treating the leachate is to use microorganism. However, all of the above conventional methods only disclose how to treat the resulting leachate but do not disclose how to prevent the generation of the leachate. Accordingly, it is an aspect of the present invention to provide a filling-up method of wet waste which reduces the leachate, thus decreases contamination and the cost of treating leachate. DISCLOSURE OF INVENTION The foregoing and/or other aspects of the present invention are achieved by providing filling-up method of wet waste comprising: spreading a wet waste over a filled up land; spreading a treatment agent over the wet waste, wherein the treatment agent comprises at least one selected from the group consisting of calcium oxide and burned dolomite. According to an embodiment of the present invention, the amount of the treatment agent is 5-85wt% of the wet waste' s water. According to an embodiment of the present invention, the method further comprises spreading the treatment agent directly over the filled up land, wherein the amount of the treatment is more than 100wt% of the wet waste' s water. According to an embodiment of the present invention, the method further comprises spreading a acid after the spreading of the wet waste. According to an embodiment of the present invention, the amount of the acid is l-20wt% of the wet waste's water. According to an embodiment of the present invention, wherein the acid comprises at least one selected from the group consisting of sulfuric acid, nitric acid, hydrochloric acid. The wet waste may comprise, but not limited thereto, food waste, human and domestic animal's excrement, meat- industry waste, agricultural waste, fishery waste, and wastewater sludge. In the filling-up method of wet waste of the present invention, the wet waste is filled up with treatment agent, which comprises at least one from the group consisting of calcium oxide (CaO) and burned dolomite (CaOMgO) . In case of mixing, the mixing ratio of calcium oxide and burned dolomite is not limited. Calcium oxide is formed by heating limestone and/or calcium carbonate to high temperature. Calcium oxide converts into calcium hydroxide (Ca (OH) 2) which is stable solid through hydration reaction with water. The hydration reaction is exothermic reaction. The heat from the exothermic reaction evaporates the water in the wet waste, thus reduces the water content of the wet waste. Additionally, in the hydration reaction, calcium hydroxide is formed by reaction between calcium oxide and water, thus reduces the water content of the wet waste. Burned dolomite is formed by heating carbonate of lime and/or calcium carbonate to high temperature and generally comprises magnesium oxide and calcium oxide. The mechanism of reducing the water content of the wet waste is similar to the case of the calcium oxide. However, by hydration reaction between burned dolomite and water, magnesium hydroxide (Mg (OH) 2) is formed as well as calcium hydroxide. The mixture of calcium oxide and burned dolomite also reacts with water in wet waste, thus removes water by heat from exothermic reaction and forming calcium hydroxide and magnesium hydroxide. The treatment agent is referred to material that comprises at least one selected from the group consisting of calcium oxide and burned dolomite hereafter. The amount of the treatment agent may be in the range of 5-85wt% of wet waste's water. When the amount of the treatment agent is less than 5% of the wet waste's water, the efficiency of preventing leachate is very low. When the amount of the treatment agent is more than 85wt% of wet waste's water, the efficiency of preventing leachate does not further improve and the filling-up capacity of the filled up land decreases. Although water in wet waste can be removed by mixing wet waste with the treatment agent, soil around the filled up land can be basified due to the resulting calcium hydroxide and/or magnesium hydroxide. Adding acid during filling up can solve this problem. The reaction of acid and the treatment agent is also exothermic, and heat from this exothermic reaction accelerates the evaporation of the water in wet waste. And due to the increased temperature, the hydration reaction of the treatment agent is accelerated to decrease filling-up time. The amount of acid may be in the range of l-20wt% of wet waste's water. When the amount of acid is less than lwt% of wet waste's water, the efficiency of preventing leachate and basification of soil is insufficient. When the amount of acid is more than 20% of wet waste's water, the soil can be rather acidified and the efficiency of preventing leachate does not further improve due to the undue amount of water in acid. Sulfuric acid, hydrochloric acid, and nitric acid may be used as acid, wherein sulfuric acid, which is generated by large amount as industrial waste, is preferable. BRIEF DESCRIPTION OF THE DRAWINGS The above and/or other aspects and advantages of the present invention will be readily apparent and appreciated from the following description of the exemplary embodiments taken in conjunction with the accompany drawings, of which: FIG. 1 is a schematic diagram according to an embodiment of the present invention; FIG. 2 is a schematic diagram according to another embodiment of the present invention. MODES FOR CARRYING OUT THE INVENTION Reference will now be made in detail to illustrative, non-limiting embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughou . The embodiments are described below in order to explain the present invention by referring to the figures. FIG. 1 is a schematic diagram according to an embodiment of the present invention. A treatment agent layer 1 is spread over the bottom surface 4 of the filled up land. The amount of the treatment agent layer 1 over the bottom surface 4 of the filled up land may be over 100wt% of water in wet waste layer 2, thus prevents the soil contamination for certain. Wet waste layer 2 is spread over the treatment agent layer 1. Over the wet waste layer 2, the treatment agent is spread by amount of 5-85wt% of water in the wet waste layer 2. Hereafter, the spreading of the treatment agent and wet waste repeats alternatively. This method only requires a sequential spreading of the treatment agent and wet waste without mixing process, thus is very convenient. FIG. 2 is a schematic diagram according to another embodiment of the present invention. The method of filling up wet waste is similar to the method in Fig. 1, such as the bottom surface 40 of the filled up land, treatment agent layer 10, and wet waste layer 20. The difference is to add acid by amount of l-20wt% of the water in wet waste layer 20 after spreading the treatment agent. This method also does not require mixing process, thus is very convenient. Although the filling-up sequence is wet waste, treatment agent, and acid in above description, the aspect of the present invention can be achieved by various other modifications. Examples are as following: the filling-up sequence may be wet waste, acid and treatment agent. Acid may be added after physical mixing of wet waste and treatment agent. Treatment agent may be added after physical mixing of wet waste and acid. Wet waste, treatment agent, and acid may be mixed altogether. Hereafter the present invention will be explained in detail through experiments. But the present invention is not limited to the experiments. < experiment 1> At first 3ton of calcium oxide was spread over soil by thickness of 70cm. And then, food waste of which water content was 88.5wt% was spread over the calcium oxide by thickness of 50cm. And over the food waste, lton of calcium oxide was spread by thickness of 30cm. Water in the food waste was removed by formation of calcium hydroxide in hydration reaction of treatment agent. Water was further removed through evaporation by heat from the exothermic hydration reaction. Additionally, 1.5ton of food waste and 1 ton of calcium oxide was spread alternatively 5 times. There was no leachate detected after 10 days from the filling-up. < experiment 2> At first 3ton of calcium oxide was spread over soil by thickness of 70cm. And then, food waste of which water content was 88.5wt% was spread over the calcium oxide by thickness of 50cm. And over the food waste, 50kg of 15% hydrochloric acid and 100kg of 15% sulfuric acid were spread. And then, lton of calcium oxide was spread by thickness of 30cm. Water was removed by formation of calcium hydroxide in hydration reaction of treatment agent. Water is .further removed through evaporation by heat from the exothermic hydration reaction. The basification of filled up land due to the hydration reaction was prevented by acid, thus the filled up land turned into neutral. Additionally, 1.5ton of food waste, 150kg of acid mixture, and 1 ton of calcium oxide were spread alternatively 5 times. After 10 days from the filling-up, there was no leachate detected and the pH of the filled up land was 7.2. As described above, according to the present invention, the generation of leachate from the filled up wet waste can be prevented. Thus cost for treating the leachate can be reduced and environmental protection can be achieved. Additionally, by making the filled up land neutral, the filled up land may be easily utilized for another use.

Claims

What is claimed is: 1. A filling-up method of wet waste comprising: spreading a wet waste over a filled up land; spreading a treatment agent over the wet waste, wherein the treatment agent comprises at least one selected from the group consisting of calcium oxide and burned dolomite. 2. The method according to claim 1, wherein the amount of the treatment agent is 5-85wt% of the wet waste's water. 3. The method according to claim 1, further comprising spreading the treatment agent directly over the filled up land, wherein the amount of the treatment is more than 100wt% of the wet waste's water. 4. The method according to claim 1, further comprising spreading acid after the spreading of the wet waste. 5. The method according to claim 4, wherein the amount of the acid is l-20wt% of the wet waste's water. 6. The method according to claim 4, wherein the acid comprises at least one selected from the group consisting of sulfuric acid, nitric acid, and hydrochloric acid.
PCT/KR2004/001591 2003-06-30 2004-06-30 Filling-up method of wet waste WO2005000489A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2003-0043485 2003-06-30
KR1020030043485A KR100430708B1 (en) 2003-06-30 2003-06-30 Filling-up method of wet waste

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2469806C1 (en) * 2011-04-18 2012-12-20 Михаил Аркадьевич Карт Insulating material
RU2469805C1 (en) * 2011-04-18 2012-12-20 Михаил Аркадьевич Карт Method for sanitary treatment of solid household wastes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5217624A (en) * 1989-09-11 1993-06-08 Onoda Cement Co., Ltd. Method for the disposal of aqueous sewage sludge
KR19980015384A (en) * 1996-08-21 1998-05-25 이남출 Various sludge and sludge stabilization and solidification treatment composition
KR20010069877A (en) * 2001-05-16 2001-07-25 허명준 Method for treating organic waste material
KR20010098360A (en) * 2000-04-24 2001-11-08 김상국 manufacturing method for fertilizer using organic waste matter
KR20020019785A (en) * 2000-09-07 2002-03-13 양경선 Method for manufacturing clothing material for waste reclaimed land
JP2003053391A (en) * 2001-08-15 2003-02-25 Epc:Kk Method of treating putrefactive waste

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5217624A (en) * 1989-09-11 1993-06-08 Onoda Cement Co., Ltd. Method for the disposal of aqueous sewage sludge
KR19980015384A (en) * 1996-08-21 1998-05-25 이남출 Various sludge and sludge stabilization and solidification treatment composition
KR20010098360A (en) * 2000-04-24 2001-11-08 김상국 manufacturing method for fertilizer using organic waste matter
KR20020019785A (en) * 2000-09-07 2002-03-13 양경선 Method for manufacturing clothing material for waste reclaimed land
KR20010069877A (en) * 2001-05-16 2001-07-25 허명준 Method for treating organic waste material
JP2003053391A (en) * 2001-08-15 2003-02-25 Epc:Kk Method of treating putrefactive waste

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2469806C1 (en) * 2011-04-18 2012-12-20 Михаил Аркадьевич Карт Insulating material
RU2469805C1 (en) * 2011-04-18 2012-12-20 Михаил Аркадьевич Карт Method for sanitary treatment of solid household wastes

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