this post was submitted on 30 Aug 2025
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Why isn't it fresh (non-salty) wastewater?
Lots of places treat their wastewater and then discharge it. For example, where I live, wastewater, that is to say, sewage which has had solids filtered out, is still rather pooey and pissy but not salty, gets treated (I don't know how) and is then injected into natural underground aquifers where it eventually percolates out to bores or springs where it's collected and used for irrigation, contributes to natural springs, or possibly even winds up in a drinking water catchment.
All wastewater, regardless what happens to it, has to be treated before release. If it's still 99.9% fresh, then why not use it to create osmotic pressure before dumping it.