Where does most of the solid mass of raw sewage end up after being collected at a treatment facility?
A)It is injected into the water table.
B)It is buried in landfills.
C)It is sold to farmers for fertilizer.
D)It is tapped for the generation of methane gas.

Question

Quizplus · Accepted Answer

The solid mass of raw sewage is typically separated from the liquid portion during the treatment process to create sludge. This sludge is then typically disposed of in landfills. Some treatment facilities may also convert the sludge into biosolids that can be used as fertilizer or generate methane gas through anaerobic digestion, but landfill disposal is still the most common method of disposal. Choices A and C are incorrect as injecting raw sewage into the water table would be a health hazard and selling it as fertilizer could potentially spread harmful pathogens. Choice D is partially correct as methane gas can be generated from sludge, but it is not the primary end use for the solid mass of raw sewage.

Where Does Most of the Solid Mass of Raw Sewage