Sewage Treatment Plant (STP) is a treatment facility where the human waste collected and carried through underground drainage systems is treated to make it environmentally safe for disposal or reuse.
![img1](https://tnussp.co.in/wp-content/uploads/2020/09/img1.jpg)
Figure 14: Sewage Treatment Plant (STP) – Top View
Source: (Indian Institute for Human Settlements, 2016)
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