Sewage Treatment
Sewage Treatment is the process of removing impurities from wastewater. This can be done through physical, chemical, or biological means.
Physical Treatment
Physical treatment removes solids from wastewater. This can be done through screening, sedimentation, and filtration.
Chemical Treatment
Chemical treatment removes dissolved impurities from wastewater. This can be done through coagulation, flocculation, and disinfection.
Biological Treatment
Biological treatment uses microorganisms to remove organic matter from wastewater. This can be done through activated sludge processes and trickling filters.
How Clean is Water After Sewage Treatment?
The cleanliness of water after sewage treatment depends on the type of treatment used.
* Primary treatment removes solids and some organic matter. The resulting water is still contaminated with bacteria and viruses.
* Secondary treatment removes additional organic matter and bacteria. The resulting water is cleaner but may still contain some bacteria.
* Tertiary treatment removes almost all contaminants. The resulting water is clean enough to be reused for irrigation or other purposes.
The table below summarizes the different types of sewage treatment and their effectiveness in removing contaminants:
| Treatment Type | Contaminants Removed |
|—|—|
| Primary Treatment | Solids, some organic matter |
| Secondary Treatment | Additional organic matter, bacteria |
| Tertiary Treatment | Almost all contaminants |
In general, water that has undergone tertiary treatment is safe for most uses. However, it is important to note that no sewage treatment process can completely remove all contaminants.