Question

Wastewater can be treated in two or three stages. The three stages are, in the order in which they are performed, _____, _____, and _____ treatment.

Stage 2

Answer 1

Wastewater treatment comprises three stages: primary (solid removal), secondary (bacterial decomposition), and tertiary (extra filtration), with secondary treatment focusing on the biological degradation of organic pollutants.

Step-by-step explanation:

Wastewater is treated in three stages at a wastewater treatment plant. These stages are:

1. Primary treatment, where solids are removed by allowing wastewater to settle in a basin, with sludge sinking to the bottom and oil and lighter substances floating to the top. These are then removed, and the liquid moves to the next stage.
2. Secondary treatment, involving aerobic bacterial decomposition. Here, bacteria break down organic solids still present in the wastewater.
3. Tertiary treatment, which includes further bacterial decomposition, additional filtration, and sometimes disinfection. This stage polishes the effluent to meet specific standards before release or reuse.

Secondary treatment involves biological processes to degrade organic pollutants in wastewater.

Answer 2

Wastewater is treated through primary treatment (solid removal), secondary treatment (bacterial decomposition), and tertiary treatment (extra filtration) in that order.

Step-by-step explanation:

Wastewater can be treated in three stages, which are, in the order in which they are performed, primary, secondary, and tertiary treatment.

Primary treatment involves the removal of solids where sewage is stored in a basin, allowing solids to settle and oil and lighter substances to rise, which are then removed.

Following this, the liquid proceeds to the secondary treatment, which includes aerobic bacterial decomposition of organic solids.

Lastly, tertiary treatment involves additional filtration and bacterial decomposition of nutrients, as well as the potential for disinfection before the water is discharged or reused.

Wastewater can be treated in two or three stages. The three stages are, in the order in which they are performed, _____, _____, and _____ treatment. Stage 2

Secondary.