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.
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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The effects of controlling acidity of cathode pond solution and adding complex agents on Cd electrokinetic processes in actual sewage sludge were investigated.