Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Takayuki Shimaoka Last modified date:2020.06.02

Professor / Water and Material Cycles System / Faculty of Engineering


Presentations
1. Ho Nhut Linh, Hiroto Tamura, Teppei Komiya, Takayuki Shimaoka, EFFECT OF HEAVY RAIN DUE TO CLIMATE CHANGE ON LEACHING BEHAVIOR OF LANDFILL WITH MUNICIPAL SOLID WASTE INCINERATION BOTTOM ASH, Proceedings of 17th International Waste Management and Landfill Symposium, 2019.09.
2. Teppei Komiya, Takeru Saruwatari, Yousuke Hakata, Amirhomayoun Saffarzadeh, HirohumiNakayama, Takayuki Shimaoka,Isamu Sandambata, Takahiro Aoki, T. Nishio, H. Akita, F. Hirosue, SIMULATING THE PERFORMANCE OF “CEMENT-SOLIDIFIED LANDFILL” OF MUNICIPAL SOLID WASTE INCINERATION RESIDUES BY DEMONSTRATION EXPERIMENT, Proceedings of 17th International Waste Management and Landfill Symposium, 2019.09.
3. Hasegawa Ryoji, Hirofumi Nakayama, Takayuki Shimaoka, Analyzing waste management considering material flow and economic influence: a case study of non-metallic mineral wastes in Japan, Proceedings of 10th China- Japan Joint Conference on Material Recycling and Waste Management, 2019.08.
4. Mitali Nag, Amirhomayoun Saffarzadeh, Takeshi Nomichi, Takayuki Shimaoka, Hirofumi Nakayama, Assessment on the degree of stabilization of Pb in MSWI fly ash by different particle sizes of waste fishbone hydroxyapatite, Proceedings of 10th China- Japan Joint Conference on Material Recycling and Waste Management, 2019.08.
5. Hirofumi Nakayama, Hirotaka Kato, Takayuki Shimaoka, Study on management of wood debris induced by northern Kyushu heavy rain in July 2017 using aerial survey and 3D modeling, Proceedings of 10th China- Japan Joint Conference on Material Recycling and Waste Management, 2019.08.
6. Hiroto Tamura, Ho Nhut Linh, Teppei Komiya, Takayuki Shimaoka, Influence of heavy rain due to climate change on leachate behavior of landfill with municipal solid waste incineration residues, Proceedings of 10th China- Japan Joint Conference on Material Recycling and Waste Management, 2019.08.
7. Teppei KOMIYA, Takuma MAEDA, Yuki KAJINO, Hirofumi NAKAYAMA, Takayuki SHIMAOKA, Takayuki HIRAO, Shuji WATANABE, Makoto TAKEMOTO, Naoya MAEDA, Akiyuki UKAI, Fumihiro KASHIMA, Removal of Fine Particle Fraction from Municipal Solid Waste Incineration Bottom Ash by Open Channel Classification, The 23rd Korea-Japan Joint International Session of Korea Society of Waste Management, 2019.05.
8. Xiang Wan, Amirhomayoun Saffarzadeh, Teppei Komiya, Takayuki Shimaoka, INFLUENCIAL FACTORS AND MECHANISM OF HYDROGEN GAS GENERATION FROM MUNICIPAL SOLID WASTE INCINERATION BOTTOM ASH REACTED WITH WATER, 平成30年度土木学会西部支部研究発表会, 2019.03.
9. Khalil Ahmad Sahil, Hirofumi Nakayama, Takayuki Shimaoka, Economic Evaluation of the Preventative Strategy for Open Dumpsites in the Residential Area of Kabul city, Afghanistan, 平成30年度土木学会西部支部研究発表会, 2019.03.
10. A. Saffarzadeh, M. Nag, T. Nomichi, T. Shimaoka, State-of-the-art Technology for the Stabilization of Pb in the Incineration Fly Ash Using Waste Fishbone Hydroxyapatite, The 4rd International Conference on Recycling and Reuse, 2018.10.
11. M. Miyakea, A. Saffarzadeh, T. Komiya, T. Shimaoka, Efforts to promote the recovery of hydrogen gas from municipal solid waste incineration bottom ash (MSWIBA) by using catalysts, The 4rd International Conference on Recycling and Reuse, 2018.10.
12. Takayuki Shimaoka, Climate Change and Landfills, International Solid Waste Association (ISWA) 2018 World Congress, 2018.10.
13. Takeru SARUWATARI, Teppei KOMIYA, Hirofumi NAKAYAMA, Takayuki SHIMAOKA, Isamu SANDAMBATA, Takahiro AOKI, Tatsufumi NISHIO, Hiroyuki AKITA, Fuminori HIROSUE, Demonstrational experiment on cement-solidification style final disposal of municipal solid waste incineration residues, The 9th China-Japan Joint Conference on Material Recycling and Waste Management, 2018.08.
14. Yousuke Hakata, Teppei Komiya, Hirofumi Nakayama, Takayuki Shimaoka, Influence of microbial activity in micro pores on durability of cement-solidified solid waste incineration Residues, The 9th China-Japan Joint Conference on Material Recycling and Waste Management, 2018.08.
15. Teppei KOMIYA, Takeru SARUWATARI, Hirofumi NAKAYAMA, Takayuki SHIMAOKA, Isamu SANDAMBATA, Takahiro AOKI, Tatsufumi NISHIO, Hiroyuki AKITA, Fuminori HIROSUE, Demonstrational Experiment on Environmental Safety of Cement-Solidification Style Final Disposal of Municipal Solid Waste Incineration Residues, The 22nd Korea-Japan International Symposium of Korea Society of Waste Management, 2018.05.
16. Naoki SHIRAISHI, Sonia Muradia SHARMA, Teppei KOMIYA, Takayuki SHIMAOKA, Optimum Conditions of Carbon Dioxide Exposure for Dechlorination of Municipal Solid Waste Incineration Bottom Ash, The 22nd Korea-Japan International Symposium of Korea Society of Waste Management, 2018.05.
17. Takayuki Shimaoka , Reuse of Incineration Bottom Ash Aiming at Minimizing Final Disposal, Geo-Environmental Engineering 2018 (GEE2018), 2018.05.
18. Khalil Ahmad Sahil, Hirofumi Nakayama, Takayuki Shimaoka, Field survey of municipal solid waste dumpsites in residential area in Kabul city, 平成29年度土木学会西部支部研究発表会, 2018.03.
19. Khalil Ahmad Sahil, Hirofumi Nakayama, Takayuki Shimaoka, Current Waste Management System in Afghanistan, 平成28年度土木学会西部支部研究発表会, 2017.03.
20. Takayuki Shimaoka, Mineralogical Transformation of MSWI Fly Ash with Thermal Treatment, Eleventh International Conference on Waste Management and Technology, 2016.10.
21. Takayuki Shimaoka, Mineralogical Transformation of MSWI Fly Ash with Thermal Treatment, 2016 Beijing International Environmental Technology Conference, 2016.10.
22. Hirofumi Nakayama, Takayuki Shimaoka, Study on factors influencing price of industrial waste treatment and disposal in Japan, The Joint Socio-Economic Metabolism conference and Asia-Pacific conference of the International Society for Industrial Ecology, 2016.09.
23. Takayuki Shimaoka, AERIAL MONITORING OF LANDFILLS AND TEMPORARY WASTE STORAGE SITES WITH DRONE/ BALLOON, International Conference on Geomatics and Planning, 2016.08.
24. Teppei Komiya, Keita Akayama, Hirofumi Nakayama, Takayuki Shimaoka, Thermal source positional estimation in landfill using surface hot spots, 韓国廃棄物学会, 2016.05.
25. Hirofumi Nakayama, Takayuki Shimaoka, Teppei Komiya, Kiminori Sakusabe, Development of thermo-graph inspection for geomembrane seam evaluation and its application to landfill constraction, 6th Asian Regional Conference on Geosynthetics: Geosynthetics for Infrastructure Development, GA 2016, 2016, This paper attempted to develop a thermo-graph inspection method for the evaluation of heat-welded seam of geomembrane. Then the proving tests using this inspection method were conducted at heat-welding construction works in new landfills. On the proving tests, heatwelding works and the thermo-graph inspection could be carried out in parallel, the results of inspection were displayed on the computer correctly. Those results indicated that this method can be applied practically at construction site of the geomembrane on landfills..
26. P. EHLER, Takayuki Shimaoka, Hirofumi Nakayama, S. SHRESTHA, A STUDY TO PROMOTE RECYCLING OF CONSTRUCTION AND DEMOLITION WASTE IN THE KATHMANDU VALLEY, NEPAL , The 2nd Symposium of Asian Regional Branch of International Waste Working Group(IWWG-ARB), 2015.04.
27. K. INKAEW, A. SAFFARZADEH, Takayuki Shimaoka, IMPACTS OF WATER QUENCHING ON MSWI BOTTOM ASH ALTERATION, The 2nd Symposium of Asian Regional Branch of International Waste Working Group(IWWG-ARB), 2015.04.
28. Pavel Ehler, Takayuki Shimaoka, Hirofumi Nakayama, A STUDY TO PROMOTE RECYCLING OF CONSTRUCTION AND DEMOLITION WASTE IN THE KATHMANDU VALLEY, NEPAL, The 2nd Symposium of Asian Regional Branch of International Waste Working Group(IWWG-ARB), 2015.04.
29. Kanawut Inkaew, Amirhomayoun Saffarazadeh, Takayuki Shimaoka, IMPACTS OF WATER QUENCHING ON MSWI BOTTOM ASH ALTERATION, The 2nd Symposium of Asian Regional Branch of International Waste Working Group(IWWG-ARB), 2015.04.
30. Seiji Kawai, Takayuki Shimaoka, Shinya Sakaguchi, Behavior of soft plastic in illegally dumped solid waste according to effective stress changes, 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015, 2015, The soft plastic mixed into solid waste landfills exhibits a reinforcing effect similar to that of geotextiles and significantly affects the assessment of slope stability. However, little research has focused on the reinforcing effect of soft plastic. In this study, the tension force generated on soft plastic under effective stress changes caused by gas pressure or pore water pressure was measured using strain gauges. The tension force corresponded with Terzaghi's principle with respect to the increasing or decreasing tendency; however, the relationship between the tension force and effective stress decreased parabolically with decreasing effective stress. In particular, tension force decreased rapidly after the effective stress decreased by half..
31. Takayuki Shimaoka, Koji Kumagai, Takeshi Katsumi, Michio Iba, Design, installation, and maintenance of temporary storage sites for radioactive decontamination waste, 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015, 2015, A number of temporary storage sites have been commissioned to contain soils and wastes generated from the decontamination works after the accident at Tokyo Electric Power Company's Fukushima Dai-ichi Nuclear Power Plant. At these sites, volume reduction has been observed in the flexible container bags caused by the dehydration and decomposition of the decontamination waste inside. This situation leads to uneven settlement of the top of these flexible container bags in these temporary storage sites, and might result in problems such as leakage through top and bottom liners installed to contain these container bags. To deal with these problems immediately, the Geomembrane Technical Committee, Japan Chapter of International Geosynthetics Society has conducted deliberations and made reports on procedures for selection and installation of storage containers that are to prevent polluted water from leaking outside of storage sites, structures, and barrier materials, a new inspection procedure for seaming of cover geomembranes, installation of cover materials that are to counter uneven settlement of soil, and also temperature control procedures to prevent natural ignition of waste. This paper summarizes the deliberations and the procedures adopted..
32. A. Nithiya, A. Saffarzadeh, Takayuki Shimaoka, Municipal solid waste incineration bottom ash
A potential source for hydrogen generation, International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2014, 2015, This paper reports the hydrogen generation potential of municipal solid waste incineration bottom ash from an incineration facility in Japan (N). Experiments were conducted by comparing the hydrogen generation potential among various particle fractions of bottom ash. Collected samples were dried and separated into four particle fractions (N1, N2, N3 and N4—from fine to coarse) and subjected to physical and chemical analyses prior to hydrogen generation. Hydrogen generation was conducted by mixing bottom ash samples with water at liquid to solid ratio (L/S) 5 and incubated at 40°C for 20 days. Gas pressure and concentration were measured at every 24 hours interval. The highest amount of hydrogen generation (cumulative) was observed in N2 particles at 20 days (41.5 l/kg dry ash). Finest particles (N1) and coarse particles (N4) showed the least hydrogen generation (cumulative) 22.5 l/kg dry ash and 25.2 l/kg dry ash respectively. The pH of liquid was observed to increase slightly after hydrogen production in each fraction..
33. Pavel Ehler, Takayuki Shimaoka, Hirofumi Nakayama, Disaster preparedness - pay attention today to avoid high cost in future, 平成26年度廃棄物資源循環学会九州支部・研究ポスター発表会, 2014.05.
34. Pavel Ehler, Takayuki Shimaoka, Hirofumi Nakayama, Disaster preparedness - pay attention today to avoid high cost in future, 平成26年度廃棄物資源循環学会九州支部・研究ポスター発表会, 2014.05.
35. Zahra Mutiala, Hirofumi Nakayama, Takayuki Shimaoka, Identification of Occupational Health and Safety Threats of Informal Sector in Solid Waste Management, 平成26年度廃棄物資源循環学会九州支部・研究ポスター発表会, 2014.05.
36. Xiong Shi, Takayuki Shimaoka, Teppei Komiya, Jin Hui Li, Proper design of leachate collection pipe in semi-aerobic landfill by two dimensional simulation, 8th International Conference on Waste Management and Technology, ICWMT 2013, 2014, Semi-aerobic method is a standard type of landfill currently used in Japan. Semi-aerobic landfill system enables to enhance the stabilization of landfilled solid waste utilizing the self-purification capacity inherent in nature. Although semi-aerobic method has been developed for about 20 years, the mechanism has not widely understood in many countries. The objective of this study is to make clear the influence of the laying condition (pipe diameter, pipe placement distance) of leachate collection pipe on the stabilization of landfill through numerical simulation, by use of landfill model constructed in this study with consideration of the interactions of microbial activity and the transport process such as gas transport, heat transport and material transfer between gas and liquid phases..
37. Takayuki Shimaoka, Chuanfu Wu, Hirofumi Nakayama, Teppei Komiya, Xiaoli Chai, Yongxia Hao, Influence Of Aeration Modes On Biostabilization Of Solid Waste In Landfills That Use The Aerobic-Anaerobic Landfill Method(AALM) , Sardinia 2013, 2013.09.
38. Amirhomayoun Saffarazadeh, Takayuki Shimaoka, Effect of Hafnium on Glass Structure and Dissolution, Goldschmidt 2013, 2013.08.
39. Shou Yang, Amirhomayoun Saffarazadeh, Takayuki Shimaoka, Distribution of chloride in municipal solid waste incineration botton ash, The Tird International Conference on Sustinable Construction Materials and Technologies-SCMT3, 2013.08.
40. Nithiya Arumugam, Takayuki Shimaoka, Sustainable energy recovery :Biomethane Generation from Organic waste, 平成25年度廃棄物資源循環学会九州支部研究ポスター発表会, 2013.05.
41. 呉 曾楨, 島岡 隆行, 焼却残渣における安定性セシウムの存在形態に関する研究, 平成25年度廃棄物資源循環学会九州支部研究ポスター発表会, 2013.05.
42. Pavel Ehler, 島岡 隆行, 20 years of Environmental Change in the Czech Republic, 平成25年度廃棄物資源循環学会九州支部研究ポスター発表会, 2013.05.
43. Mitali Nag, 島岡 隆行, Influence of intermittent aeration on GHGs abatement and leachate quality in Aerobic Anaerobic Landfill Method, 平成25年度廃棄物資源循環学会九州支部研究ポスター発表会, 2013.05.
44. Mitali Nag, Takayuki Shimaoka, Influence of Intermittent Aeration on GHGs Abatement and Leachate Quality in Aerobic Anaerobic Landfill Method, Korea-Japan International Symposium , 2013.05.
45. Mitali NAG, Takayuki Shimaoka, Influence of operational parameters on GHGs abatement and leachate quality in Aerobic Anaerobic Landfill Method, 平成24年度土木学会西部支部研究発表会, 2013.03.
46.  NGUYEN Thi Hoa Ha, Takayuki Shimaoka, CONTRIBUTION OF BIOLOGICAL HYDROLYSIS AND PHYSICOCHEMICAL DISSOLUTION IN MUNICIPAL SOLID WASTE DECOMPOSITION, 平成24年度土木学会西部支部研究発表会, 2013.03.
47. Shuo Yang, Amirhomayoun Saffarzadeh, Takayuki Shimaoka, Takashi Kawano, Distribution of chloride in municipal solid waste incineration bottom ash, 3rd International Conference on Sustainable Construction Materials and Technologies, SCMT 2013, 2013.01, Chloride content is a critical problem for the reuse of incineration bottom ash as raw material in cement. The effect of dechlorination procedure largely depends on the existence form of the chlorides. However, limited information about the distribution and identity of chlorides in bottom ash can be obtained by bulk analysis methods. In this paper, the investigation towards a more comprehensive understanding about chloride in bottom ash was carried out by means of optical microscopy and scanning electron microscopy. Two types of bottom ashes with different cooling methods were studied. It was revealed that chloride was mainly contained by the glass in the air-cooled bottom ash and, moreover, a strong association between chloride and calcium was disclosed. Water quenching altered the morphology of ash particle and formed fragile phase, which concentrated relatively high content of chloride. The crystalline chloride of Friedel's salt was also identified in the water-quenched bottom ash..
48. Haixia Zhang, Takayuki Shimaoka, Effect of composted sewage sludge on metals leaching behavior in municipal solid waste incineration bottom ash, 2012 International Conference on Sustainable Energy and Environmental Engineering, ICSEEE 2012, 2013, In order to study the effect of organic matter on the heavy metals leachability from municipal solid waste incineration (MSWI) bottom ash. In the project, the composted sewage sludge (CS) rich in organic matter was mixed with MSWI bottom ash in a certain proportion. e exudation test, determination of the leaching liquid pH, dissolved organic carbon and humus concentration, and the concentration of heavy metals. And the combination of CS and BA in organic compounds and metal content, calculate metal leaching rate. According to the experimental results, analysis of dissolved organic matter and humic acid concentrations and Cu and Cr leaching concentration, showed that when CS mixture ratio of 20%, organic matter and humic substances concentration and Cu and Cr leaching concentrations are highly linear correlation..
49. N. Hirayama, Takayuki Shimaoka, T. Fujiwara, T. Okayama, Y. Kawata, Implementation of intelligence of flood disaster debris discharge for emergency response, 7th International Conference on Computer Simulation in Risk Analysis and Hazard Mitigation, RISK10, 2010.12, In this study, a procedure is established for estimating and assessing the amount of flooding debris following a flood disaster. The per unit generation of flood disaster debris, which takes into account criteria such as the extent of housing damage as a function of inundation duration time, is examined. It is shown that this estimation procedure would make it possible to estimate debris discharge, which is helpful for the establishment of disaster management systems not just as emergency response measures, but also for pre-disaster planning. The proposed Relative Quantity of disaster Debris (ReQD) provides insight that makes it possible to ascertain the emergency response capability of local governments. The ReQDs of selected flood disasters in Japan are examined. For the establishment of effective emergency response systems, it is important to evaluate information on both the ReQD and the quantity of flood debris. From these facts, it is concluded that the implementation of ReQD can help in the establishment of effective support systems with a wide range of cooperative measures for districts in the process of flood recovery and reconstruction, as well as in the emergency response stage..
50. N. Hirayama, Takayuki Shimaoka, T. Fujiwara, T. Okayama, Y. Kawata, Establishment of disaster debris management based on quantitative estimation using natural hazard maps, 2010.01, In this study, an estimation procedure was established to assess the amount of debris resulting from earthquake and flood disasters. Per unit generation of earthquake disaster debris was examined on the basis of observed debris discharge from the 1995 Great Hanshin Awaji Earthquake and the 2004 Niigata Chuetsu Earthquake. In addition, the per unit generation of disaster debris from flood damage above floor level was estimated at 4.6 t/household. It was shown that this procedure would allow the amount of debris to be estimated in order that disaster management and operation systems could be established for not only emergency response in the aftermath, but also pre-disaster planning. In a case study, the amount of disaster debris from earthquake and catastrophic flood disasters in the Tokyo Metropolitan Area was estimated according to hazard maps. It is concluded that it is important, from the viewpoint of the security of sanitary systems in the damaged district, that disaster debris management systems including wide-ranging cooperative measures should be established..
51. Takayuki Shimaoka, Hirofumi Nakayama, T. Hirai, J. Hironaka, T. Katsumi, S. Ueda, H. Kanou, Evaluation of physical properties of aged geomembranes taken from landfill sites in Japan, 9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010, 2010.01, Geomembrane liners in landfills fulfill the important role of avoiding groundwater and soil pollution by preventing leakage of leachate. In order to maintain the effectiveness of the liners for a long time, they should be tolerant against physical and chemical factors prevailing in the environment under which they are used. However, due to the lack of durability data obtained from the field samples, little is known about the actual durability of liners in landfill sites. In this study, 66 geomembrane samples in total, which comprise 27-year-old PVC, 24-year-old TPO, 18-year-old EPDM, 12-year-old HDPE, etc., were taken from six different landfill sites, one test site of landfill liners, and one test site of pond liners. Tensile tests were carried out along both the Machine (MD) and Transverse (TD) direction, and retention ratio of tensile strength (=amount of change/initial × 100), retention ratio of extension at break (=amount of change/initial × 100), and retention ratio of thickness were obtained. Using the above results, the changes in the physical properties of the liners were evaluated..
52. J. Hironaka, T. Hirai, Takayuki Shimaoka, Hirofumi Nakayama, T. Katsumi, S. Ueda, H. Kanou, Method of evaluating the durability of geomembrane in landfill, 9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010, 2010.01, Geomembranes are an important structure in landfill sealing systems, because they are hydraulically impervious and deterioration resistant. However, the durability evaluation of a geomembrane is mainly based on accelerated weatherability tests. Therefore, the Japan Chapter of the International Geosynthetics Society investigated four types of geomembranes (PVC, HDPE, TPO, EPDM) at six locations in Japan with the objective of evaluating geomembrane durability. First, several geomembrane test samples were collected from each landfill. Then, the samples were evaluated by laboratory tensile tests. Based on the test results, the relationship between total solar radiation and geomembrane elongation is discussed. The results revealed that the geomembrane elongation ratio is linearly related to in-situ total solar radiation. Finally, a durability evaluation method of geomembrane is suggested based on the results of this research..
53. Hirofumi Nakayama, Takayuki Shimaoka, S. Ueda, K. Aoyama, Thermo-graph inspection for geomembrane seam evaluation, 9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010, 2010.01, This study attempted to develop a new method for detecting failures on welded seams between geomembrane liners. To identify the location of faulty seams, thermal images taken by a thermo graphic device were used to determine the unique temperature distribution on the faulty seam. It was shown that the real-time inspection for detecting faulty area was possible by taking thermal images of the seams while the sheets were welded by a self-propelled heat-welding machine. This method is more efficient compared to the conventional inspection method as that the seam can be examined with the welding work..
54. Hirofumi Nakayama, Takayuki Shimaoka, S. Ueda, Development of thermo-graph inspection for geomembrane seam evaluation, 4th Asian Regional Conference on Geosynthetics, Geosynthetics Asia 2008, 2008.01, This study attempted to develop of a method for detecting failures on welded seams between liner sheets. To identify the location of faulty seams, thermal images taken by a thermo graphic device were used to determine the unique temperature distribution on the faulty seam. It was shown that the real-time inspection for detecting faulty area was possible by taking thermal images of the seams while the sheets were welded by a self-propelled heat-welding machine. This method is more efficient compared to the conventional inspection method as that the seam can be examined with the welding work..
55. Non- destructive test for geomembranes by visible near- infrared spectroscopy.
56. Estimate of thermal stress of geomembrane using a thermal infrared imaging device.
57. Study on Effect of Mixture of Organism on Chlorine Removal of Municipal Soild Waste Incineration Residue.
58. Effect of Composted Sewage Sludge on Metals Leaching Behavior in Municipal Soild Waste Incineration Bottom Ash.
59. A COMPARATIVE STUDY ON THE DISTRIBUTION OF HUMIC SUBSTANCES IN LEACHATE FROM LANDFILLS MAINLY DISPOSED WITH MSW AND MSWIR.
60. Immobilization of Heavy Metals in Long-term Landfilled MSWI Residues Due to Weathering.
61. Application of X-Ray Diffraction Analysis in the Characterization of Municipal Solid Waste Incinerator Residues.
62. Effect of the liquid quality on the Hydration of a Composite Aggregate Particle to use as a liner material at landfill sites.
63. Estimation of Acid Generation from Coal Mine Waste.
64. Settlement characteristics of incineration residue and the behavior of the pollutant in a sea area landfill site.
65. Mechanisms and effectiveness of accelerated weathering of msw incinerator residues as a landfill pretreatment.
66. Heavy metal leaching from fly ash under salinity conditions.
67. Leaching Characteristic of Heavy metals from Landfilled Treated Incinerator Fly Ashes.
68. Takayuki Shimaoka, Masataka Hanashima, Behavior of stabilized fly ashes in solid waste landfills, Proceedings of the 1996 Seminar on Cycle and Stabilization Technologies of Municipal Solid Waste (MSW) Incineration Residue, 1996.12, In Japan, the fly ash generated by incineration of municipal solid waste has come to be handled as general waste under special management in recent years. At the same time, direct landfilling or ocean dumping of fly ash is legally prohibited. To avoid the possibility of causing damages affecting human health or life environment, fly ash must be subjected to intermediate treatment, and must stabilized, encapsulated and made hygienic by removing pollutants. Four methods can be given for fly ash intermediate treatment; (1) cement solidification, (2) treatment by chemicals, (3) acid and other solvents and (4) melting and solidification. On the other hand, various phenomena affecting fly ash occur on the landfilled waste layer, such as generation of organic acid and carbon dioxide gas due to decomposition of solid waste. Fly ash solidified by cement is deteriorated by water-soluble sulfate and organic acid and carbon dioxide gas produced by decomposition of organic substances in the municipal solid waste. This may result in a reduced strength of hazardous substances and re-melting of fly ash solidified by cement. Furthermore, encapsulated hazardous heavy metals may be eluted from fly ash treated by chemicals due to the change in chemical environments (pH, ORP, etc.) in the landfilled solid waste layer according to stabilization of the landfilled solid waste. However, not much is known about the physical and chemical properties of the fly ash after it has been disposed of with the general solid waste at the landfill site. Thus, in this present study, the large-sized landfill model lysimeter is filled with cement-solidified fly ash or chemically treated fly ash treated together with municipal solid waste (bottom ash and shredded solid waste) to obtain correct information on the changes in the physical and chemical properties of the cement-solidified fly ash, and temporal concentration of hazardous substances (Pb, Cd, Cr6+) contained in seepage leachate or leachate in the landfilled solid waste layer, thereby clarifying the long-term stability of the disposed fly ash. This study has revealed that the pH value of the cement-solidified fly ash tends to be neutralized with the process of time, although the compression strength of the cement-solidified fly ash left to stay in the land filled solid waste for three years is not reduced much below that at the time of experiment start-up. This trend of neutralization has been found to be conspicuous in the vicinity of the leachate collection pipe at the bottom landfill layer. Furthermore, the pH values of seepage leachate and leachate have been observed to be reduced by the disposal of the fly ash chemically treated with municipal solid waste. This indicates that the concentration of the heavy metal such as Pb and Cd is severely affected by pH values. Namely, the pH value of the leachate from the large-sized landfill model lysimeter filled with chemically treated fly ash is close to neutral value, and concentrations of the Pb and Cd tend to be greater than those of the leachate from the large-sized landfill model lysimeter not filled with chemically treated fly ash. This suggests that the chemical properties of the treated fly ash and the solid waste disposed of with it determines the pH value of the seepage leachate and leachate and, at the same time, greatly affects the concentration of the heavy metal..