Digested sewage sludge (slurry) from the Municipal Wastewater Treatment Facility on North 70th street in Lincoln, is piped to an area of cropland just north of I-80 called the Sludge Farm. The sludge is injected into the soil under pressure using a tractor fitted with injection knives to a depth of about a foot. On a field basis, 5 tons (dry weight) of sewage sludge is applied per acre. Sludge C:N-7, Carbon content-40% C. What do we know about this sludge as a raw material?

a. Mass of applied sludge material (Ibs/acre) =
b. Mass of carbon in the applied sludge (Ibs/acre) =
c. C:N of sludge =
d. Mass of nitrogen in applied the sludge (Ibs/acre) =