Just curious

[galeus]

How does the sewerage system work around here?
I live in Santiago overlooking the Plaza and often see tanker trucks pumping their contents down a manhole near the Plaza restaurant. Does it get pumped along a pipe out into the sea; is it treated at all?
Also the same going down to the harbour in LG, there appears some equipment on the right and it often pongs. Where does it go from there?
Just curious.