Technology

Real-life 'stillsuit' recycles body fluids into drinkable water

Real-life 'stillsuit' recycles body fluids into drinkable water
A team of YouTubers built this functional water-recycling stillsuit in a day
A team of YouTubers built this functional water-recycling stillsuit in a day
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A team of YouTubers built this functional water-recycling stillsuit in a day
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A team of YouTubers built this functional water-recycling stillsuit in a day
The prototype suit: not what you'd call figure-hugging
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The prototype suit: not what you'd call figure-hugging
The heat exchanger/condenser unit drains into a bottle, fed by moist air from the wearer's breath
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The heat exchanger/condenser unit drains into a bottle, fed by moist air from the wearer's breath
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In Frank Herbert's Dune novels, water is so scarce on planet Arrakis that it's absolutely sacred to the desert-dwelling Fremen, who wear special 'stillsuits' that capture and recycle nearly all their body fluids. Now, a YouTuber has built one for real.

In first Dune book, which has recently been made into a two-part movie epic, planetologist Liet Kynes explains the stillsuit to Duke Leto Atreiades as follows:

"It's basically a micro-sandwich – a high-efficiency filter and heat-exchange system. The skin-contact layer's porous. Perspiration passes through it, having cooled the body... near-normal evaporation process. The next two layers... include heat exchange filaments and salt precipitators. Salt's reclaimed. Motions of the body, especially breathing and some osmotic action provide the pumping force. Reclaimed water circulates to catch pockets from which you draw it through this tube in the clip at your neck... Urine and feces are processed in the thigh pads. In the open desert, you wear this filter across your face, this tube in the nostrils with these plugs to ensure a tight fit. Breathe in through the mouth filter, out through the nose tube. With a Fremen suit in good working order, you won't lose more than a thimbleful of moisture a day..."

And thus was a "one day build" project launched for YouTube channel Hacksmith Industries. Movie-inspired builds are certainly a theme for these guys; they've previously built versions of Thor's Stormbreaker Axe, Captain America's electromagnetic shield, and a plasma-powered lightsaber that burns through doors, flesh and plastic stormtroopers at 4,000 degrees.

The scope of these guys' projects is sometimes way beyond what you'd expect, as in the 'MegaHex' video below, in which the team builds a colossal 'Spider Mech' using six excavator arms for legs:

Our BIGGEST project yet! (SPIDER MECH!)

The stillsuit-in-a-day project is a much more humble enterprise, but certainly a fascinating concept. Can body fluids really be captured, filtered and recycled into drinking water in a practical way?

Well, first things first: the team left the urine and feces recycling to the Fremen. This suit is limited to two body fluids: sweat, and the moisture in the wearer's breath. Our disappointment is immeasurable, but we shall persist.

In other ways, the new suit's pretty true to the source material, though. The team starts out with what's effectively a waterproof bag-suit, and installs a heat exchanger in the back, powered by a small LiPo battery pack. This presents a cold surface on the interior of the suit, onto which any humidity can condense, and then drip down into a catchment bottle.

The prototype suit: not what you'd call figure-hugging
The prototype suit: not what you'd call figure-hugging

Then, a one-way filter mask is attached to a tube, such that the wearer can breathe in fresh (filtered) air, but then as they breathe out, that warm, moist air is sent back down into the suit and blown directly over the condenser element to have its water content harvested.

The heat exchanger/condenser unit drains into a bottle, fed by moist air from the wearer's breath
The heat exchanger/condenser unit drains into a bottle, fed by moist air from the wearer's breath

The catchment bottle feeds a CamelBak bladder, and the CamelBak's nozzle is run back into the mask where the wearer can drink from it, with a four-stage water filter set inline to make the whole thing a tad more palatable. A quick test shows the concept does indeed produce some drinking water, which apparently tastes no worse than CamelBak water does at the best of times.

For the final suit, most of this gear remains, but the suit itself is switched out for a more form-fitting plastic clean-room bunny suit, over which it's possible to fit a stillsuit costume. The final result might not pass muster stood next to Zendaya and Timothée Chalamet – particularly the bulky gas mask on the front, but it's not a terrible look. Check it out:

Building a real DUNE STILL SUIT (1 DAY BUILD)

Does it work? Yes, to a degree. Under exercise and sauna testing, Hacksmith's head of video production "Darryl" certainly generates enough moisture to sip on. But the suit definitely has its limitations; it can only harvest moisture from humidity at the back of Darryl's neck, so we presume the bulk of the sweat he generates is simply rolling down the inside of the bunny suit and sloshing around his ankles. So there's work to be done to get down to that famous thimbleful a day.

Still (sorry!), it's a fun project – and one that might have some relevance as humanity prepares to spend more time working in spacesuits on the Moon in the next few years, and working towards setting up a Mars colony. The International Space Station currently manages to recycle some 98% of all water used by astronauts on board, and the more we expect astronauts to be doing in space suits, the more important it'll be to retain as much of that precious water as possible.

Source: Hacksmith

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2 comments
2 comments
Karmudjun
Nice Loz. I was thinking in terms of reverse osmosis, but pure filtration without much power is a cool endeavor. When it gets to the reverse osmosis with a higher purity level for days of filtration, I might see a realistic utilization of urine as well. It isn't dangerous to drink "urinated fluids", it just isn't what I'd term palatable. But once you remove the salts and nitrogen wastes, urine cleans up well - after all we have been drinking dinosaur piss all of our lives, plus fish and whale piss too. How many thousands of years of those animals waste in our water system have we dealt with? Not the kind of pondering I want to consider - but one day we may need to develop systems like this!
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Daishi
I like some of the crazy ideas pitched by science fiction. Lots of random interesting tech was shown in science fiction before it was real and sometimes the sci-fi version guides the creation of the real one. This is part of why I wish more people would build creative worlds that aren't just dystopian hellscapes.