In order to reduce the amount of residue ash Shelbyville generates this year to half of last year's total, the city has revamped its collection program.
为了将谢尔比维尔今年产生的灰渣数量减少到去年总量的一半，该市已经修改了其收集计划。
However, the high ash content and logistical problems with collection and processing will limit full utilization of this resource.
但是，灰分含量高和收集加工上的困难制约了对它们的充分利用。
The collection capacity of heavy metal ions by porous powder made from fly—ash is studied.
用实验的方法研究了用粉煤灰制取多孔粉末材料对重金属离子的富集能力。
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