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Volume 60 , Issue 2
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Original Papers
  • Yuta YAMAJI, Katsunori OKAYA, Gjergj DODBIBA, Li Pang WANG, Toyohisa F ...
    Volume 60 (2013) Issue 2 Pages 65-71
    Released: September 10, 2013
    JOURNALS FREE ACCESS
    Plastics have been used in various applications. The amount of domestic production in 2009 was 1.1 Mt. These days, mechanical recycling for the plastic is required, but one of the biggest problems of this method is how to separate black plastics. Black plastics contain carbon black as a colorant, which make them difficult to be identified by infrared adsorption (IR) spectroscopy. Thus, in this study, we are putting forward Raman spectroscopy for separating plastics (including black plastics) from the discarded appliances.
    There are reports which indicate that PP, PS, and ABS represent 70–80% of the discarded plastics. Each of them has its own characteristic peaks in Raman spectrum. In case of PP black plastics, nearly 100% of the feed can be identified, however, PS is difficult to be identified when carbon black content is about 3%. ABS of the discarded appliances was not identified. Finally, other fillers such as bromine flame retardants and calcium volume expander did not have any effect on Raman spectrum.
    In addition, we run some experiments for separating the discarded plastics by means of combining Raman identification with triboelectric separation. In Raman identification, the longer we exposure, the more amount of recovery we got, but grade was the highest in 1.0 s exposure, and it was over 95%. In triboelectric separation, however, the grade of ABS and PS were about 70%.
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  • Koh SHIMIZU, Kenta OMURA, Yukio KITAMURA, Hiroshi ONODA, Katsuya NAGAT ...
    Volume 60 (2013) Issue 2 Pages 72-77
    Released: September 10, 2013
    JOURNALS FREE ACCESS
    This paper aims at evaluating the efficacy of LFS (Liquid Feeding System) which feeds shochu distillery by-product as liquid feed in a pig farm from a perspective of CO2 emission. Specifically, by obtaining the survey data in the business (brewing manufacturer, pig farm) which adopted LFS in Kagoshima Prefecture, the comparison with the other processes such as the formation of dried feed mainly used in the feed-producing technique, was performed. As a result, it was found that the CO2 emission per pig was reduced 3% as compared with the case where the usual formula feed was used, and the CO2 emission per pig was reduced 18% as compared with the case where the same amount of shochu distillery by-product was made into dried feed. Furthermore, while confirmed that it has an economic advantage over the other processes of feed formation, it was objectively shown that this is a mechanism which is beneficial to both brewing manufacturers and pig farms.
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