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( Teppei Komiya ),( Takuma Maeda ),( Yuki Kajino ),( Hirofumi Nakayama ),( Takayuki Shimaoka ),( Takayuki Hirao ),( Shuji Watanabe ),( Makoto Takemoto ),( Naoya Maeda ),( Akiyuki Ukai ),( Fumihiro Kas 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
Approximately 20% of solid waste in Japan is disposed of at coastal landfill sites. It is an issue that it takes long-term to stabilize coastal landfill sites. Municipal solid waste incineration bottom ash (BA) is one of main wastes landfilled at coastal landfill sites. It is known that finer particles contain more contaminants in BA1), and it was demonstrated that the removal of finer particles from BA produced the lowering pH of leachate as well as the increase of permeability of the landfilled waste layer2). In this study, open channel (OC) classification was focused on as a feasible technique to remove finer particles from BA on a coastal landfill site, and its demonstrational experiment was carried out in order to clarify if the fine particle fraction (d<0.425mm) (FPF) could be removed from BA by OC classification and the settling characteristics of BA in OC. Fig. 1 shows the experimental apparatus. The sea water in a coastal landfill site was pumped up and flowed in OC, and BA is supplied on the surface of the flowing water. After completions of the settling and outflow of BA, saucers on the bottom of OC was collected, and the dry weight and particle size distribution of the BA sediment in each saucer were measured. Table 1 shows the experimental condition. The settling section means the part of OC from the BA supply point to the end of OC. Fig. 2 shows the removal ratio of FPF by OC classification, which is the ratio of the dry weight of FPF in the BA sediment to that in the BA supplied. The largest removal ratio was 61% in Case 3 with the largest water flow velocity and the shortest length of settling section. Fig. 3 shows the median of the settling velocity of BA in OC (MSV) compared with the theoretical settling velocity by Allen’s and Newton’s laws (TSV). The MSV of BA particles greater than 3mm was almost 50% of TSV, and MSV became closer to TSV as BA’s particle size became smaller. The MSV of BA particles with a diameter of 0.425mm was approximately 80% of TSV.
( Pavel Ehler ),( Teppei Komiya ),( Takayuki Shimaoka ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
This paper provides experimental investigation as well as numerical simulations on the influence of moisture content and dry bulk density on self-heating of biomass during storage in flexible intermediate bulk containers (FIBC). The accident at the Fukushima Daiichi Nuclear Power Plant (NPP) in March 2011 was caused by the great earthquake and tsunami, and as a consequence released large quantities of volatile radionuclides into the environment. Therefore, the Japanese government is working on decontamination of contaminated areas off-site the Fukushima NPP, which includes removing of the top layer of soil and biomass, mainly branches and grass, and storage in FIBC. Biological self-heating is one of the issues which can occurs during storing of biomass, thus it has been investigated by experiment and associated with numerical simulation of simulate heat transport and distribution inside FIBC. The effects of the moisture content and dry bulk density on self-heating of biomass were established during the 90 days of indoor experiment at ambient temperature. The results show strong impact of moisture content and dry bulk density on temperature rise and distribution inside FIBC due to respiration and decomposition of biomass. The highest temperature reached to 69.0 °C in FIBC having 81.3% moisture content in the first two weeks. On the other hand, dry biomass (Moisture content: 14.6%) nearly imitated the ambient in temperature. Moreover, weight loss and settlement occurred mainly in FIBC with 68.5 and 81.3% moisture content and it could significantly influence the storage process. Based on the results, it was revealed that keeping low level moisture content about 15% during filling and storing biomass inside FIBC prevented from self-heating and also spontaneous ignition.