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）。
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.
如果能实现洗水闭路循环，不仅能大大提高洗煤厂的经济效益，又能取得良好的社会效益。
If it can realize the closed circuit circulating of washing-water, can not only increase economic benefit but also can obtain the social benefit in coal preparation factory.
生产应用表明，该方法简单，处理效果好，可满足洗水闭路循环清水洗煤的要求。
The practical application has shown that the method is simple, can obtain good results and help to realize clear water wash coal and closed circuit the circulation of washing water.
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