Which of the following plays some role in sewage treatment?

Question

Quizplus · Accepted Answer

All of the choices play a role in sewage treatment.

Activated sludge is a biological process used to treat wastewater. In this process, microorganisms are added to the wastewater to break down organic matter, producing a sludge that can be removed.

Trickling filters are another biological process. Wastewater is sprayed over a bed of rocks or other media, allowing bacterial growth to occur. The bacteria form a biofilm on the media, which breaks down pollutants in the wastewater.

Septic tanks are used to treat wastewater from individual homes or businesses. The tank separates solids from the wastewater, and the liquid portion is then discharged into a leach field, where it percolates through the ground.

Lagooning is a process in which wastewater is stored in large, shallow ponds or lagoons. The wastewater is allowed to sit for a period of time, during which physical, biological, and chemical treatment occurs.

Which of the Following Plays Some Role in Sewage Treatment