Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
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Volume 48, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • Leaching Characteristics of Radiocesium in Municipal Incineration Ash and Safety Measures Utilizing Clay Minerals
    Naoharu MURASAWA, Hikaru SAWAI, Ismail Md. Mofizur RAHMAN, Tamao HATTA
    2019 Volume 48 Issue 3 Pages 156-161
    Published: May 20, 2019
    Released on J-STAGE: May 26, 2019
    DOIhttps://doi.org/10.5956/jriet.48.156
    JOURNAL FREE ACCESS
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    The municipal solid waste incineration ash from the Fukushima Prefecture includes radioactive Cs. There is a need to grasp the basic physical properties of this ash, determine the leaching properties of radioactive Cs, and examine leaching suppression methods in order to continue to advance appropriate disposal techniques. For this purpose, we carried out material sampling from a municipal solid waste incineration plants in the Fukushima Prefecture in summer and winter. We then conducted tests on the samples. Results showed that the radioactive Cs leaching suppression method for mixing clay minerals at weight ratio of 5 to 20％ can become an effective safety measure.

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  • Creation of Artificial Soil Aggregates for Wastewater Treatment
    Kuniaki SATO, Kanae ABE, Aya TAKAMATSU, Noriko IWASHIMA, Tsugiyuki MAS ...
    2019 Volume 48 Issue 3 Pages 146-155
    Published: May 20, 2019
    Released on J-STAGE: May 25, 2019
    DOIhttps://doi.org/10.5956/jriet.48.146
    JOURNAL FREE ACCESS
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    　To develop a new wastewater treatment system using soil, artificial soil aggregates were produced using a stirring granulation method. The water purification performance of artificial soil aggregates was evaluated under high-speed treatment conditions. Artificial soil aggregates contained high levels of organic matter and phosphorus removal capacities compared to earthworm cast aggregates and silica sand. However, the purification performance of sawdust mixed artificial soil aggregates was relatively low, which was likely due to the formation of a thick biofilm. The purification performance of iron powder mixed artificial soil aggregates decreased when excessively aerated, which was likely due to the production of excessive iron oxides around them. Zeolite mixed artificial soil aggregates had higher levels of ammonia and nitrogen removal capacities. Although artificial soil aggregates displayed the same nitrogen removal rate as conventional soil-based systems, further studies are needed to improve its nitrogen removal capacity.

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