sludge is difficult to dispose of because?
A. it sinks to the bottom of wastewater-treatment plants
B. it often contains toxic of hazardous materials
C. there is so much of it
D. it is noncombustible
One Response
DrHenry
09 Mar 2010
DrHenry
09 Mar 2010
Looking at the answers
A. In a well run treatment plant, this is not true.
D. Sludge can be incinerated, although the cost is high.
B. This is true in a very small minority of cases. It depends on the level found. Yes, all sludge will have a measurable amount, but not enough usually to cause it not to be used say as compost or incinerated
C. This is the big one. Treatment plants create a lot of sludge, most due to economics, is just landfilled.