This paper proposes a forecasting method for future occupied dwellings by considering the change in household type, which is an important phenomenon in Japan due to population aging. It is demonstrated that the actual number of household that dwelled in detached houses during 1990-2010 can be explained by the change in household type. The actual number of households that occupied tenement-houses and apartments can be reproduced by considering the change in relation between type of buildings and households. This method is adapted to forecast future occupied dwellings in Japan, revealing that the number of detached houses will reach 28.41 million in 2015. It also demonstrates that the average size of floor space will be reduced because of a substantial increase in the number of apartments due to the increase of single-person households among the elderly, especially in urban area.

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 This study evaluated the effectiveness of half-burnt dolomite in adsorbing arsenic (As) leached from excavated mudstone by batch and column experiments. The results showed that the dolomite adsorbed As (V) more effectively than As (III), and that the adsorption isotherms conformed to the Freundlich type. Not only As but also B leached from mudstone was adsorbed on dolomite by column experiments. In addition, 60% of As adsorbed was classified into a residual fraction by sequential extraction after column experiments. This indicates that the adsorbed As is immobile on the dolomite.

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