Sewage treatment
Sewage Treatment
Sewage treatment (pronunciation: /ˈsuːɪdʒ ˈtriːtmənt/) is the process of removing contaminants from municipal wastewater, containing mainly household sewage plus some industrial wastewater.
Etymology
The term "sewage treatment" is derived from the English words "sewage", which refers to waste water and excrement conveyed in sewers, and "treatment", which refers to the process of making something free of bacteria or other contaminants.
Process
Sewage treatment involves three stages: primary, secondary, and tertiary treatment.
- Primary treatment involves the removal of large particles and solids from the sewage.
- Secondary treatment involves the breakdown of organic matter in the sewage using bacteria.
- Tertiary treatment involves the removal of remaining inorganic compounds and substances, making the water safe for discharge or reuse.
Related Terms
- Wastewater - Water that has been used in homes, industries, and businesses that is not for reuse unless it goes through a treatment process.
- Effluent - Outflowing of water or gas from a natural body of water, or from a manmade structure.
- Sludge - The residual, semi-solid material left from industrial wastewater, or sewage treatment processes.
- Biochemical Oxygen Demand (BOD) - The amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.
- Chemical Oxygen Demand (COD) - The measure of pollutants in wastewater and water samples.
External links
- Medical encyclopedia article on Sewage treatment
- Wikipedia's article - Sewage treatment
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