Nope, at South Pole it's pumped in to the ice. In general, there's an amazing amount of refuse down there, it's a very expensive place to ship things out from...
The water supply for the station comes from a rodwell, which is effectively a big bubble of molten ice, sustained by heat from the diesel generators. Once the rodwell gets to a certain size, some water can be extracted for use on station, and the bubble lowers progressively in to the ice. Eventually, the liquid surface in the well gets too deep for the pump in the well to pump water all the way to the surface, so a new well is started.
Waste water then goes in to the void left from the old well; poo, gunk off the dirty dishes, etc all included.
