If a septic system is to be used for sewage disposal,

Question

Quizplus · Accepted Answer

The soil should be unsaturated, containing sufficient air (oxygen) to permit aerobic breakdown of wastes. In a septic system, the wastewater is treated and disposed of on-site, mainly with the use of bacteria that break down the organic material in the wastewater. Oxygen is necessary for the bacteria to perform aerobic digestion, which is the most effective method of breaking down the organic material. Therefore, the soil should be unsaturated to allow for oxygen to be present for the aerobic bacteria. The other options are incorrect as high population density is not required for efficient operation, and not all potential pollutants may be decomposed in normal operation. The surrounding soil does not necessarily have to be impermeable, but it should be able to allow for proper drainage.

If a Septic System Is to Be Used for Sewage