Sewage sludge
Sewage Sludge
Sewage sludge (pronunciation: /ˈsuːɪdʒ slʌdʒ/) is a byproduct generated during the treatment of wastewater in wastewater treatment plants.
Etymology
The term "sewage sludge" is derived from the words "sewage", which refers to waste water and excrement conveyed in sewers, and "sludge", which refers to a thick, viscous liquid.
Definition
Sewage sludge is a semi-solid slurry that is produced from the sewage treatment process. It is composed of both organic and inorganic materials, a large concentration of plant nutrients, as well as a significant amount of pathogens.
Treatment and Disposal
The treatment and disposal of sewage sludge is a complex process that involves several steps. The primary goal of these processes is to reduce the volume of the sludge, eliminate pathogens, and make it suitable for final disposal or beneficial use. Common methods of treatment include anaerobic digestion, aerobic digestion, composting, and lime stabilization.
After treatment, the sludge can be disposed of in various ways such as land application, landfill disposal, and incineration.
Related Terms
- Biosolids: Treated sewage sludge that meets the criteria for beneficial use.
- Sludge bulking: A problem that can occur in the sewage treatment process where the sludge has a poor settling ability.
- Sludge blanket: The layer of sludge in a settling tank during the sewage treatment process.
See Also
- Wastewater
- Sewage treatment
- Anaerobic digestion
- Aerobic digestion
- Composting
- Lime stabilization
- Land application
- Landfill disposal
- Incineration
External links
- Medical encyclopedia article on Sewage sludge
- Wikipedia's article - Sewage sludge
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