34 J. Hot Spring Sci. /2 ,3.ῌ-*+ ,**3ῌ῏ῐ῍ !
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  ,+,0,+,Technological Countermeasure for Flammable Gas
in Hot Spring Water
Experiments at Kamisu-Wakamatsu Hot Spring
Source in Ibaraki Prefecture
Yuu HORIKAWA+, Tadashi TOBITA+ and Atsushi MIYATA,

Abstract
Although ﬂammable gases are not always contained in hot spring waters, their concentrations and output are depending on various factors, such as locality, depth andgeological settings of hot spring sources. Here, we studied ﬂammable gas (methane) in
Kamisu-Wakamatsu hot spring source in Kamisu City of Ibaraki Prefecture in relation toits concentrations and gas-water ratios during stepwise hot spring water lifting tests.
Also, we investigated changes in gas concentrations in hot spring waters on the way
through hot spring facilities such as a gas separator and so on. This report summarizes
those data obtained in the experiments in order to apply to ﬂammable gas treatment in
hot springs hereafter.
Key words : Kamisu-Wakamatsu hot spring source, methane gas, ﬂammable natural gas,gas-water ratio, gas composition.

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