Living · 6 pages · 12 min
How a septic tank is not a sewer
A septic tank settles waste on site, while a sewer carries it away to a treatment plant.
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From the opening
A septic tank is not a sewer because it does not carry wastewater off to a distant treatment plant. It is a buried box on the property where solids settle, some digestion happens, and the liquid that leaves still has to be treated in the soil of a drain field. The opening covers sludge sinks and scum floats, anaerobic digestion only goes so far, and the drain field treats the liquid.
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Inside
- Sludge sinks and scum floats
- Anaerobic digestion only goes so far
- The drain field treats the liquid
- Why solids must stay in the tank
- Where the idea stops applying
- A distinction worth keeping
Sources
- Settling and anaerobic digestion in a septic tank
- Soil treatment in a septic drain field