Why do they use pond sludge?

为什么用塘泥？

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On December 22nd 2008, a holding pond at a Tennessee Valley Authority coal-fired power plant ruptured, sending 978m gallons (3,702m litres) of ash into a nearby river, where it turned to sludge.

2008年12月22日，田纳西州流域管理局一座煤电厂的洗煤池溃口，向附近一条河流排入9.78亿加仑（3.702亿升）洗煤水，其中的煤灰在沉淀为淤泥之后被运往尤宁敦郊外的一个填埋点—亚罗海德（Arrowhead）。

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Analyze sludge movement in the course of the mud scraper in concentrated pond operating, changes the straight line trowel to the curve trowel, raises the mud scraper working efficiency.

分析浓缩池刮泥机运转过程中污泥运动情况，改直线刮泥板为曲线刮泥板，提高了刮泥机工作效率。

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On Monday, a dike gave way, the coal ash that had been turned into sludge in the pond flooded the neighboring areas.

NPR: In Tenn. Town, A Muddy Christmas For Some