ASSESSING ECOTOXICITY OF EXCAVATED SOIL FROM SHIELD TUNNELING USING BIOASSAY

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  • 生物応答を利用したシールド発生土の安全性の評価
  • セイブツ オウトウ オ リヨウ シタ シールド ハッセイド ノ アンゼンセイ ノ ヒョウカ

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Abstract

<p> The construction of tidal flats and shallow habitats is considered to be one of the effective utilization methods for excavated soil from the mud pressure shield tunneling type (shield excavated soil). However, shield excavated soil is supplemented with agents such as foaming agents, which require biological safety assessment for effective utilization. Therefore, in this study, we applied the idea of whole effluent toxicity test, adopted in many countries in recent years, to evaluate the safety of shield excavated soil using bioassay. During the test, a flow of seawater was maintained and afterwards, compartments of shield excavated soil and natural sand were constructed in the experimental aquarium. The biomass, sex ratio, and growth rate of benthic organisms, microalgae, and microorganisms were monitored, and the difference between shield excavated soil and natural sand was statistically tested. The results showed no significant difference between the excavated shield soil and natural sand.</p>

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