STABILIZATION OF LANFILL SOLID WASTE SURROUNDED BY DAILY COVER SOIL

( Takayuki Shimaoka ),( Naoko Hori ),( Shogo Sakita ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1

It is currently exceedingly difficult to obtain land for a new landfill site in Japan and towards prolonging the effective life of existing landfill sites by decreasing the volume consumed by the volume of cover soil materials, research is being conducted into an alternative material that may be used in the place of cover soil. This study utilized two dimensional large simulated landfill lysimeters replicating the cell method in order to elucidate the behavior of pollutants in waste landfill sites when used paper is utilized as alternative to cover material. The long term experiment was undertaken to determine the impact of different cover materials on the characteristics of the discharge flow (volume and quality) of the leachate. As a result of this experiment, it was found that a cover layer composed of soil causes channeling in the movement of liquid within the landfill thus creating a region in which the stabilization of the waste (washing out and degrading of pollutants) is retarded. On the other hand, an alternative cover material that allows a thinner cover layer while providing the functions required of cover material was found to mitigate the delayed stabilization.

Surrounded by Daily Cover Soil 일일복토방식에 따른 매립 폐기물의 안정화에 관한 연구

( Takayuki Shimaoka ),( Naoko Hori ),( Shogo Sakita ),( Kentaro Miyawaki ),( Junichi Kano ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2

현재 일본에서는, 매립지의 부지 확보가 어려워지고 있기 때문에, 복토재료의 이용 용적을 감소함으로써, 매립지의 수명을 연장시키는 데 관심을 갖고 있다. 본 연구는, 복토토양을 대신하여 사용될 수 있다고 여겨지는 복토대체재료에 관하여 이루어졌다. 오염물질의 거동을 해석하기 위해 두 개의 모형매립조가 설치되었고, 복토재료로는 폐지가 사용되었다. 장기 실험을 통해, 침출수의 발생량 특성(용적, 양)에 대한 여러 복토재료의 영향을 파악하였다. 토양을 적용한 복토층의 경우, 매립조 내에서 액상의 이동에 대해 채널링을 유발하였고, 이는 폐기물의 안정화(오염물질의 분해 및 세척효과에 의한)가 지연되는 것으로 조사되었다. 한편, 복토재료로서의 기능을 갖춘 대체 복토재료를 얇은 두께로 적용했을 경우, 안정화 기간을 줄일 수 있는 것으로 조사되었다. It is currently exceedingly difficult to obtain land for a new landfill site in Japan and towards prolonging the effective life of existing landfill sites by decreasing the volume consumed by the volume of cover soil materials, research is being conducted into an alternative material that may be used in the place of cover soil. This study utilized two dimensional large simulated landfill lysimeters replicating the cell method in order to elucidate the behavior of pollutants in waste landfill sites when used paper is utilized as alternative to cover material. The long term experiment was undertaken to determine the impact of different cover materials on the characteristics of the discharge flow (volume and quality) of the leachate. As a result of this experiment, it was found that a cover layer composed of soil causes channeling in the movement of liquid within the landfill thus creating a region in which the stabilization of the waste (washing out and degrading of pollutants) is retarded. On the other hand, an alternative cover material that allows a thinner cover layer while providing the functions required of cover material was found to mitigate the delayed stabilization.

CIRCULATION PURIFICATION OF THE SEA PORE-WATER IN SEA LANDFILL SITE

( Daisaburou Koga ),( Takayuki Shimaoka ),( Masataka Hanashima ),( Kentaro Miyawaki ),( Takeshi Yoshimochi ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1

In a sea landfill site, the pore-water (sea water) hardly moves in the landfill waste layer, and the inside of the landfill waste layer tends to be in an anaerobic state. In a sea landfill site, elution and decomposition of corrupt substances which are included in waste become slow. As a result, a long period of time is taken to be able to finish the management of sea landfill disposal place. We are developing the method which circulates the sea pore-water in the landfill waste layer as a method of shortening a management period. I think that elution and decomposition of a corrupt substances, which are contained in the landfill waste, can be accelerated by this method. In this research, sea pore-water was circulated in the incineration ashes filling column which modeled the inside of the landfill waste layer of sea landfill site. We investigated the effect of circulation of sea water on purification, and stabilization of Landfill waste. By circulating the sea water in the landfill waste layer, the carbon and the nitrogen elements were eluted from incineration ashes to sea water in early stages of circulation of sea water, and decreased with progress of time. Existence of a microbe was confirmed at this time. As a result, it is confirmed that elution of the corrupt substances from reclamation waste to sea water, and decomposition of the nitrogen and organic substance in which the microbe participated, were checked. At this time, It turned out that elution of a and decomposition cornet substances are greatly influenced by the discharge of the sea water which circulated around it. Furthermore, even if pressure gradient of water is fixed, the discharge can be changed significantly. It turned out that the amount of generating gas also affects the discharge of water.

Micro-scale Distribution of Heavy Metals in Chelate-treated Municipal Solid Waste Incineration Fly Ash Prticles

( Hiroki Kitamura ),( Takayuki Shimaoka ),( Fumitake Takahashi ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-

Immobilization effect of chelate treatment was investigated using leaching experiments. Chemical forms of immobilized heavy metals in chelate treated municipal solid waste incineration (MSWI) fly ash were also investigated. Leaching experiments showed that heavy metals in chelate-treated MSWI fly ash are immobilized except for Cu. Some of Cu was incorporated into crystal structure of ettringite generated by chelate treatment. However, immobilization effect by ettringite might be limited. Chemical forms of heavy metals in chelate-treated MSWI fly ash seems to be oxides, sulfate or chlorides. Heavy metal particle sizes are several ten μm scale and concentrated spots of heavy metals were not mostly observed. Therefore, heavy metals seem to be distributed widely and tenuously on fly ash particle.

Hydrogen Generation Potential in MSW Incinerator Bottom Ash

( Nithiya Arumugam ),( Takayuki Shimaoka ),( Amirhomayoun Saffarzadeh ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.1

In this study, the feasibility of bottom ash in hydrogen generation was evaluated based on the aluminium-water based reaction. Bottom ash products which collected from two incineration facilities in Japan (R and N) were analysed for hydrogen production. Samples were grouped into two particle size fractions (1≦d≦2mm and 2≦d≦4.75mm). Samples from facility N showed seven to nine times higher hydrogen production compared to plant R samples. Smaller fraction of N samples (1≦d≦2mm) showed 1.2 times higher hydrogen generation than bigger particles (2≦d≦4.75mm). The pH of all four samples remains in the alkaline condition throughout the experimental period.

INFLUENCE OF LANDFILLED CHEMICALY-TREATED FLY ASH ON LEACHATE QUALITY

( Kentaro Miyawaki ),( Takayuki Shimaoka ),( Masataka Hanashima ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1

In recent times in Japan, most municipal solid waste has been incinerated. Therefore, most landfill waste is incinerator residue and incombustible crushed waste. Incinerator residue can be classified as either incinerator bottom ash or fly ash. As fly ash contains considerable amounts of heavy metals, it is landfilled after the legally-required stabilizing treatment. As a result, heavy metal leaching from treated fly ash is inhibited. However, it is not known what influence the co-disposal (mixed disposal) of bottom ash, crushed waste and fly ash has on the leachate. In this study, we have continued to experiment with two types of chemically stabilized fly ash using a large-scale lysimeter that simulates landfill co-disposal, and measured leachate quality, temperature and gas composition over several years. In this experiment, we used untreated fly ash, and both organic and inorganic chemically-stabilized fly ash. Mixed waste was made from bottom ash, fly ash, crushed waste and compost. Leachate quality from the lysimeter with the untreated fly ash (Lysimeter A), the lysimeter with organic chemically-stabilized fly ash (Lysimeter B) and the lysimeter with inorganic chemically-stabilized fly ash (Lysimeter C) were measured. Experimental results show that the extent of heavy metal leaching depends on pH, ORP, and salt concentrations. Heavy metal effluence abounds in the early periods of landfilling and that the rate of effluence was small.

Microcharacterization Study of Secondary Mineral Phases During Natural Weathering of Landfilled MSWI Bottom Ash

( Amirhomayoun Saffarzadeh ),( Takayuki Shimaoka ),( Yunmei Wei ) 한국폐기물자원순환학회 2010 APLAS Vol.2010 No.0

Influence of Leachate Collection Pipe on Stabilization in Semi-Aerobic Landfill through Numerical Simulation

( Xiong Shi ),( Takayuki Shimaoka ),( Teppei Komiya ) 한국폐기물자원순환학회 2010 APLAS Vol.2010 No.0

해양 매립지에서 공극수의 순환 정화

( Daisaburou Koga ),( Takayuki Shimaoka ),( Masataka Hanashima ),( Kentaro Miyawaki ),( Takeshi Yoshimochi ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2

해양 매립지에서, 공극수(해수)는 매립 폐기물 층에서 거의 움직이지 않고, 매립 폐기물 내부는 혐기성 상태인 경향이 있다. 해양 매립지에서, 폐기물에 포함된 부패한 물질의 용출과 분해가 천천히 일어난다. 그 결과, 해양 매립지의 관리를 끝내기 위해서는 긴 시간이 걸린다. 우리는 관리 기간을 단축시킬 방법으로 매립 폐기물 층에서 공극수를 순환시키는 방법을 개발했다. 매립 폐기물 중에 함유된 부패된 물질의 용출과 분해가 이 방법에 의해 촉진될 것이다. 본 연구에서, 해양 매립지의 매립 폐기물 층의 내부를 모형화한 소각재를 채운 칼럼에 공극수를 순환시켰다. 우리는 매립된 폐기물의 정화와 안정화에서 해수 순환의 효과를 조사했다. 매립 폐기물 층에서 해수의 순환에 의해, 초기에는 소각재로부터 해수로 탄소와 질소성분이 용출되었는데, 시간이 지남에 따라 감소하였다. 미생물의 존재가 현재는 확실하다. 결과적으로, 매립 폐기물로부터 해수로 부패된 물질이 용출되는 것이 확실해졌고, 미생물과 관련된 유기물과 질소의 분해가 억제되었다. 현재, 부패된 물질의 주위를 순환하는 해수의 흐름에 의해 용출과 분해가 크게 영향을 받는 것으로 판명되었다. 게다가, 수압의 경사가 고정되어 있다면, 흐름은 눈에 띄게 변경될 것이다. 발생된 가스의 양은 물의 흐름에 영향은 주는 것으로 판명되었다. In a sea landfill site, the pore-water (sea water) hardly moves in the landfill waste layer, and the inside of the landfill waste layer tends to be in an anaerobic state. In a sea landfill site, elution and decomposition of corrupt substances which are included in waste become slow. As a result, a long period of time is taken to be able to finish the management of sea landfill disposal place. We are developing the method which circulates the sea pore-water in the landfill waste layer as a method of shortening a management period. I think that elution and decomposition of a corrupt substances, which are contained in the landfill waste, can be accelerated by this method. In this research, sea pore-water was circulated in the incineration ashes filling column which modeled the inside of the landfill waste layer of sea landfill site. We investigated the effect of circulation of sea water on purification, and stabilization of Landfill waste. By circulating the sea water in the landfill waste layer, the carbon and the nitrogen elements were eluted from incineration ashes to sea water in early stages of circulation of sea water, and decreased with progress of time. Existence of a microbe was confirmed at this time. As a result, it is confirmed that elution of the corrupt substances from reclamation waste to sea water, and decomposition of the nitrogen and organic substance in which the microbe participated, were checked. At this time, It turned out that elution of a and decomposition corrupt substances are greatly influenced by the discharge of the sea water which circulated around it. Furthermore, even if pressure gradient of water is fixed, the discharge can be changed significantly. It turned out that the amount of generating gas also affects the discharge of water.

화학적처리로 용출된 비산재의 매립지에서의 영향

( Kentaro Miyawaki ),( Takayuki Shimaoka ),( Masataka Hanashima ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2

최근 일본에서, 대부분의 도시고형폐기물은 소각 되어지며 불연성 폐기물 및 소각재는 매립되어진다.소각재는 바닥재 또는 비산재로 분류되어 지며, 비산재는 적지않은 중금속을 함유하며, 이것은 안정화 처리후 매립되어 진다. 그 결과 처리된 비산재의 중금속 침출수는 억제되어진다. 그러나 바닥재, 분쇄된 폐기물 그리고 용출된비산재의 공동처분의 영향에 대해서는 알려진바가 없다. 이 연구는 화학적으로 안정된 비산재 2가지 종류를 가지고 몇 년간 매립지내 공동처분과 침출수의 특성, 온도를 측정하였고 가스 구성에 관한 실험을 하였다. 실험에서 비산재, 유기 및 무기물, 화학적으로 안정된 비산재를 사용했으며, 혼합폐기물은 바닥재, 비산재, 분쇄폐기물과 퇴비로 만들었다. 침출수 특성은 처리되지않은 비산재(Lysimeter A), 화학적으로 안정된 유기 비산재(Lysimeter B) 그리고 화학적으로 안정된 무기 비산재(Lysimeter C)로 측정하였다. 실험결과 침출수의 중금속 농도는 pH, ORP 그리고 염도에의해 좌우된다. 이전 매립지에서 유출된 중금속은 많지만 유출비율로는 작다. In recent times in Japan, most municipal solid waste has been incinerated. Therefore, most landfill waste is incinerator residue and incombustible crushed waste. Incinerator residue can be classified as either incinerator bottom ash or fly ash. As fly ash contains considerable amounts of heavy metals, it is landfilled after the legaly-required stabilizing treatment. As a result, heavy metal leaching from treated fly ash is inhibited. However, it is not known what influence the co-disposal (mixed disposal) of bottom ash, crushed waste and fly ash has on the leachate. In this study, we have continued to experiment with two types of chemically stabilized fly ash using a large-scale lysimeter that simulates landfill co-disposal, and measured leachate quality, temperature and gas composition over several years. In this experiment, we used untreated fly ash, and both organic and inorganic chemicaly-stabilized fly ash. Mixed waste was made from bottom ash, fly ash, crushed waste and compost. Leachate quality from the lysimeter with the untreated fly ash (Lysimeter A), the lysimeter with organic chemically-stabilized fly ash (Lysimeter B) and the lysimeter with inorganic chemically-stabilized fly ash (Lysimeter C) were measured. Experimental results show that the extent of heavy metal leaching depends on pH, ORP, and salt concentrations. Heavy metal effluence abounds in the early periods of landfilling and that the rate of effluence was small.