Sewage sludge - gesui o dei

Japanese: 下水汚泥 - げすいおでい

This refers to excess sludge discharged as a result of sewage treatment. As the penetration rate of sewerage systems has increased, the amount of sewage sludge produced has also increased sharply. Sewage sludge is dehydrated after adding an appropriate coagulant and becomes dehydrated sludge with a moisture content of about 70%. Dehydrated sludge is disposed of by land landfilling, sea landfilling, dumping into the sea, or by effective use. Due to the limited space available for land and sea landfill, sludge needs to be reduced to 1/5 to 1/7 of its original volume by incineration, but this requires a large financial burden for incineration equipment and fuel costs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

下水を処理した結果排出される余剰汚泥をいう。下水道の普及率の上昇とともに下水汚泥の産出量も急増してきた。下水汚泥は適当な凝集沈殿剤を加えたのち脱水し，水分70％程度の脱水汚泥となる。脱水汚泥は陸上埋立て，海面埋立て，海中投棄，有効利用などにより処分されている。陸上･海面埋立地の有限性のため，汚泥は焼却処理により1/5～1/7に減量させる必要があるが，焼却設備や燃料費などの経費負担が大きなものになっている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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