1.
to reuse or make (a substance) available for reuse
2.
a substance (such as manure or a chemical mixture) used to make soil more fertile
3.
precipitated solid matter produced by water and sewage treatment processes
4.
something that is impure or makes something else impure
5.
living, active, or occurring only in the presence of oxygen
6.
something that is suitable or safe to eat
7.
tank a tank in which the solid matter of continuously flowing sewage is disintegrated by bacteria
