2002 Fiscal Year Final Research Report Summary
Accelerated Stabilization of Waste Landfill by Activation of Microbial Functions
| Project/Area Number |
12450213
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Osaka University |
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Principal Investigator |
FUJITA Masanori Osaka University, Dept. of Environmental Engineering, Professor, 大学院・工学研究科, 教授 (70029289)
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| Co-Investigator(Kenkyū-buntansha) |
IKE Michihiko Osaka University, Dept. of Environmental Engineering, Associate Professor, 大学院・工学研究科, 助教授 (40222856)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Waste Landfill / Accelerated Stabilization / Bioventing / Circulation of Leachate / Hazardous Gas / Eco-toxicity / Degradable Plastics |
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| Research Abstract |
Experimental studies were carried out to evaluate the feasibility of application of bioventing techniques, which is one of the in situ bioremediation techniques for clean-up of contaminated soil, to accelerate the stabilization of waste disposal landfill. Pilot- and/or lab-scale landfill reactor studies indicated that the application of bioventing, i.e. feeding of air to the waste pile, successfully transformed the condition of the waste pile to aerobic/microaerobic from anaerobic, considerably stimulated indigenous aerobic bacterial populations, and enhanced aerobic degradation of the wastes. The necessity of proper control of the moisture content of the waste pile (approx. 50 %) by circulating the leachate was suggested in order to stimulate the metabolic activities of aerobic bacterial populations. The aerobic degradation of wastes enhanced the waste settlement and also effectively improved quality of the leachate and the landfill gas. Especially degradation of the volatile matter in the waste pile, removal of COD, and nitrification of ammonium in the leachate were improved by the application of bioventing coupled with circulation of the leachate. Ecotoxicological assays of the leachate clarified that the application of bioventing could considerably reduce the mutagenicity and estrogenicity of the leachate compared with the traditional anaerobic landfill. The bioventing was also effective for accelerating the biodegradation of some degradable plastics including PHB and starch-blend plastics. It may be concluded that the application of bioventing to the waste landfill can enhance the landfill stabilization and greatly shoten the period that is required for the landfill management. It may also contribute to the reduction of the possible risks cause by the waste landfill. Aerobic landfill operation like bioventing application could be an attractive counter measure for overcoming major problems of the existing landfill sites.
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