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。
2
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。
3
The collection capacity of heavy metal ions by porous powder made from fly—ash is studied.