improvement of bottom sediment

環境公害
Synonyms (2)：

improvement of bottom sediment (底質改良)
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sediment purification (底質浄化)
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Related terms (2)：

cleaning (purification) (浄化)
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anoxic water mass (貧酸素水塊)
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Broader terms (1)：

water environment preservation (水環境保全)
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