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Yooooo this is SEXY.

• Feed stuff into biodigester to homogenize it and and skim (literally and figuratively) off a preliminary fraction
• Feed it through the SWO
• Chromatography or Membrane filtration to recover the chems
• Send the water off for final refinement into distilled water

You'd probably want to store all water in a distilled de-ionized state then have mixing be done on-location depending on local needs.

...good god the chemical processing & water treatment park in a ship or hab is probably the size of the drive section and equally guarded. 😆

Conversely in a perfectly circular economy things like different brands of bottled water might turn out to be a shockingly big contributor towards emotional wellbeing. Brains are weird like that. Spot more carbonation here, little more minerals there and people feel a lot less the tinned fish they are.

ANYWAY

You can use it both as a predigestion step of greywater and a post treatment oxidation step.

For blackwater (sewage) and compost algea would be insufficient.

To a degree this exists and I'm a fan.

Aquaculture and vermicomposting can be combined to break down things but it creates residual nutrient heavy mud which needs to be pre and post processed.

Additionally it isn't powerful enough to draw out pathogens from outright sewage which also introduces heavy Metal heavy mud.

Microbial digestion definitely goes a long way but there's a lot of stages and separating chemicals from dirt particles at 99% effectiveness is annoying as hell.

Basically yeah it's a Thing but tricky as hell.