Playa Tested Greywater Evaporator

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100 Proof
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Re: Playa Tested Greywater Evaporator

Post by 100 Proof » Tue Jan 02, 2018 3:53 pm

I know this thread is 6.2 million years old, but this is the design I brought last year and I thought I would post in the event someone could use the ideas. To give credit where credit is due, I have taken my inspiration from The CO’s MK VIIa2 Evaporator. I do have 465 Watts of solar panels on the roof to power everything, so if you are looking for something wind powered, this ain't it.

I don’t know the evap rate, but I never filled that bucket. I EASILY evaporated somewhere around 85 gallons over 12 days. Wife and I showered every other day. I had pool chlorinating tabs in the bucket and filter. No odor. The filter got us through a week, then I flipped it over for the next 5 days. There is a bilge pump float in the bottom of the bucket to turn off the pump. I also had a cheap Chinese controller that I set up to run 30 seconds on, 5 minutes off. I’ll add a couple more valves, but I was really happy with it.
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I put the evap unit on the roof to be out of the wind and sun shadows. Kept hippies from peeing in it and emptying beer cans.
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There is a drain in the tub that went back down to the bucket.
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ygmir
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Re: Playa Tested Greywater Evaporator

Post by ygmir » Wed Jan 03, 2018 8:20 am

nice looking design and build. Thanks for sharing.
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Re: Playa Tested Greywater Evaporator

Post by Meat Hunter » Wed Jan 03, 2018 9:55 am

Very nice. Great creative idea. Evaporating 85 gal. is very impressive. Good work.
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FlyingMonkey
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Re: Playa Tested Greywater Evaporator

Post by FlyingMonkey » Wed Jan 03, 2018 1:57 pm

"Kept hippies from peeing in it and emptying beer cans."

Kind of the same thing. A true hippie would never dump a beer that they mooched off someone else.

You had pretty good results considering it was a bit humid this year. Is there anything that just didn't work as well as you had hoped or anything you plan on changing for next time? I would consider using something like this and haul more water for showers without worrying about maxing out my greywater tank. 30 gallons goes remarkably fast when people sneak in to your bus & take showers.

BTW - When can I have my brown towel back? :D
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100 Proof
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Re: Playa Tested Greywater Evaporator

Post by 100 Proof » Mon Jan 08, 2018 5:39 pm

FlyingMonkey wrote:"Is there anything that just didn't work as well as you had hoped or anything you plan on changing for next time? :D
This thing exceeded my expectations. Aside from higher humidity, we had less wind as well, although it was hot as fuck. The only thing I would change is the addition of 2 ball valves on either side of the filter to facilitate changing the filter.

didjeridude
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Re: Playa Tested Greywater Evaporator

Post by didjeridude » Mon Mar 05, 2018 4:15 am

I'm designing a cascade evapotron and came across this thread which has great ideas. Someone mentioned above they just use a square or rectangle design which it a great idea actually because this allows the following modifications to increase total surface area:

1. use a 4x4ft square sheet of play for the top piece. Corner posts to keep the ply sheet level.
2. a series of vertical 4x4' sheets of evap pad material of choice zip tied to the wire mesh backing. Evenly space these say every 6-12". So for example a 4x4' cube would have 5x 4x4' squares "lengthway" + another 2x 4x4' squares for the sides = 112 sq.ft total surface area, versus only 63' for approximately the same ground area footprint using a circular design (nb: total surface area would increase to 176 sq.ft if the 4x4' vertical evap pads were spaced every 6" apart).
3. A generic floor standing household fan blowing air across the evap pad "lattice"
4. Drill lots of evenly spaced small holes in the top ply sheet above each evap pad sheet
5. Use a system of pvc pipes + T and elbow pieces to distribute water evenly across top of ply sheet.
6. Marine bilge pump as per usual
7. A valve + additional pvc pipe lower down to pump water directly into a bucket as a back up.
8. propane flame throwers set to auto-hippie detect mode to fry the fuck out of anyone who tries to piss in the pond

Everything packs down into a 4x4' square, and with the ply sheet on the bottom the whole lot could be lifted as a single package by 2 people at most for transport.

Any other mods that would improve on this please share!
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Re: Playa Tested Greywater Evaporator

Post by EGAZ » Mon Mar 05, 2018 6:22 pm

Used this last year. (2017) Trash can sized bucket cooler. 8' radiator fan, two pumps, double thick evap pad. Evaps 2.5gals per hour in the heat of the day, 1 to 1.5 all other times.
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The two tubing rings go on top of the pads obviously, not shown.

Used this 'Bin style' the year before. Same evap rates as the trash bin above. Uses the same pumps same double media, but two PC fans
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Toe
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Re: Playa Tested Greywater Evaporator

Post by Toe » Wed Mar 13, 2019 6:14 pm

Here's a theoretical hybrid between a FIGJAM cooler and an evapotron.

-no electricity
-'reverse stack effect' aids convection, maybe.
-bag pump powered by foot traffic.
-gravity based pump can be 'charged' quickly but actuate slowly if desired.
-cheap!

The filter outlet is not properly drawn, I know.
A rope lifts the sand filter by way of a partially suspended board.
The weight of the filter acuates the bag pump by gravity.
Here is an example of a bag pump.

And here is a walk through of the design concept:

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Token
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Re: Playa Tested Greywater Evaporator

Post by Token » Wed Mar 13, 2019 8:12 pm

Toe wrote:
Wed Mar 13, 2019 6:14 pm
Here's a theoretical hybrid between a FIGJAM cooler and an evapotron.
That’s all good until someone pukes or takes a piss in there late at night.

It happens way more than is discussed on the boards here.

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Canoe
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Re: Playa Tested Greywater Evaporator

Post by Canoe » Thu Mar 14, 2019 5:47 am

Toe wrote:
Wed Mar 13, 2019 6:14 pm
Here's a theoretical hybrid between a FIGJAM cooler and an evapotron.
So the FIGJAM cooler connection is it has evaporation...

That first filter stage is tricky. What will flow while not clogging and stop flow.

Second stage sand. Sand makes a great filter. It will be contaminated when you're done, and have to be handled safely and disposed of accordingly. If it was just filtering natural river/lake water, you could bake the sand in a fire to kill biologicals, and use it to filter again. But greywater introduces all kinds of chemicals and particles into it. Filtering with sand also takes time.

The wicking up the towel. Won't happen the way you expect. You might get a few inches lift. Wicking material won't improve that meaningfully. But if the spray from above can wet the towel, and until it gets too crusty, wet on the outside will evaporate and disperse away into the dry air (no airflow required).

I don't see that spray being strong enough to move any meaningful amount of hot dry air into the towel cylinder. But as above, towel surface area will evaporate if wet. The outside surface has free flow for the water vapour to move way. Inside the cylinder, the humid air's path away is limited. Likely far better performance by having several "leaves" of towel, connected in the centre and opening outwards to the side (somewhat like opening up a book pages to fan out), so the latent evaporation from the towel surface can freely move away at 360 degrees to disperse in the dry playa air. Any wind will accelerate that process on the upwind side, except for clogging with dust.
Is there enough water flow down the towel(s) to clear them of dust. Will the dust stick to the towel fibres.

Instead of towel, using the blue evap-cooler media would have a lot more surface area, and airflow, for evaporation to take place, even though it wouldn't "hold" as much water. And if there's enough water flow, dust will easily wash off it. You should be able to bag them and remove them from the playa, then clean and rinse them off-playa for use the following year.

There can be a sun-baked ABS stack for drawing air up it and out the top. That might fit in a revised design. I've always wondered about that for drawing humid air out of a greywater container, so dry playa air is also drawn inside. Increasing surface scum film would limit evaporation. Almost needs parallel containers, connected closer the bottom, so the greywater can settle in the first container, some particles falling to bottom with scum going to the surface of the first, and the somewhat cleaner greywater goes into the second, where bake-stack pulls humid air out of the second.

If it rains, rare as that is, where does the greywater go.

Too dependant on the step lift to drive the bag pump.

Bag-pump is contaminated with the greywater. And if it leaks, backflow all over.

For some separation, possibly: bag-pump full of air, when it has pressure, it injects air into greywater line to make an air-lift line. Maybe, maybe not.

A lot of parts. Many points of failure.
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