Burn Your Waste With... Water?

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Supercritical water produces fire without flames, which is great for making clean drinking water from our waste in space or breaking down forever chemicals here on Earth.

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Straw and hay is a fire hazard if it's too wet. The water allows bacteria to heat it up even to the point of burning.

brainwater

A team in Reykjanes Iceland are piping water down a hole near lava to make super critical steam which comes up another pipe. The steam drives a turbine to make electricity.
Drilling a single hole with concentric pipes would make a long Liebig condenser. Decending water and waste would be heated by rising water, CO2, H2 and salts. If you don't have lava the rock at the bottom of the hole could be heated with electricity when renewables over produce. The H2 can be used for ammonia, and the rest can be mineralised in basalt (see Carbfix also in Iceland).

robertparkinson

Although resolving the forever chemical problem would be wonderful, I feel like, based on past experience, storing pollutants underground may not be the best solution.

"Let's just put this underground and deal with it later. I'm sure it will be fine."

IagoBoom

I remember there being a planet that is close enough to it’s star that the heat, and pressure made it a ice planet that is extremely hot. Would that ice be a supercritical ice planet.

ginnungagapabyss

Question! Do underwater volcanic vents get there? Or does that heat/pressure/water not get there?

TheRexisFern

Can it... Hum.. dissolve a body? Asking for a friend

GenesisEnder

I thought fire water was whisky. You learn something new every day.

michaelmcchesney

This is so neat! I would love to see more about super critical water reactors.

seabeepirate

The co2 produced from breaking down pfas will be a rounding error to a rounding error compared to our normal GHG emissions.

Mrklol

Wait, there is finally an option for removing PFAS?! Holy hell that is great news.

hungrymusicwolf

Not really my place to promote but this is one of the coolest ideas I've come across as a young adult in the wastewater field. There is a company, 374 Water (scwo)-ticker- that is trying to take this to the real world. They are highly ambitious and I've actually seen one of their demo reactors here in Kokomo Indiana. They have a little way to go but given the right equipment and "fuels" these things could really take off. Pfas and other dissolved solids are a big deal and it's going to be extremely difficult to remove without some sort of process like this. These reactors can't handle normal "water" though, has to have a good source of fuel to keep it going. There is a lot to expand on this but it's here and it's real. Not perfect but very very cool 😎

pbpwnr

I'm wondering about the energy cost to produce all that pressure and temperature.

flamencoprof

Fascinating info! Can't wait to hear more from my favorite science channels!

cacts_ulion

Sub critical water at temperatures above 250 Celsius exhibits simular properties at much lower pressures. Hydrous pyrolysis, Wet Oxidation, & Thermal Depolymerazation are names used for these processes. The lower temperatures and pressures make them easier to implement but require reaction times between 15 to 30 minutes. This reaction has been used to break down everything ftom old tires and plastics to chemical waste. It is a sealed process to maintain required pressure.

richvandervecken