Mistwash Rig

Collecting, filtering and dewatering of WVO SVO vegetable oil. For Biodiesel producers too.

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Mistwash Rig

Postby SunWizard » Tue Mar 04, 2008 6:54 pm

24 October 2006

Note after testing many batches with my TDS meter (below) I have shown that the CF removes the contaminants so well that I don't mistwash any more. Here is what I built to mistwash some very bad VO I got. I use the barrel from my Centrifuge, and this drum lid $7.28 from http://www.grainger.com/Grainger/wwg/itemDetailsRender.shtml?ItemId=1612699782.

Then I drilled a hole in the top center and stuck this 4759T23 4gph mist head in it $22.14 from here at http://www.mcmaster.com/nav/enter.asp?pagenum=1939

Just add fittings to connect to a garden hose. I mistwash until the water comes out clear. I am testing using a TDS (total dissolved solids) meter on a mini-mistwash of about a cup of the VO to determine if a mistwash is needed and if its removing anything. Most of the time I have determined that a mistwash isn't helping and is not needed.
Image

I hook a clear braided hose to the valve at the bottom, which goes straight up the side of the barrel. After I have mistwashed for 30 minutes and there is an inch or 2 of water on the bottom, I open the valve and water goes into the hose and up the side. Then when the water gets high enough it comes out the hose automatically maintaining whatever level I choose by how high the hose is. I clamp the hose in different positions onto the rigid CF pipe that goes up the side. You could use any pipe or board for the same function. This is nice since it allows adjusting for different batch sizes.

When its done, I close the valve, let it sit overnight for good separation, then lay the hose below the barrel on the ground, and use the same valve to drain all the water off the bottom by watching when VO starts to come out.
Last edited by SunWizard on Sun May 04, 2008 11:01 am, edited 1 time in total.
YVORMV - Your veg. oil results may vary.
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What does MistWashing do exactly

Postby UncleMarkProductions » Fri Mar 07, 2008 7:27 pm

Okay i get your drawing but what is happening?
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Postby SunWizard » Fri Mar 07, 2008 7:47 pm

A mistwash removes harmful water soluble contaminants like acids, bases, salts, sugar and soap. The fine mist of water from the nozzle drips down slowly through the VO, and then comes out the "water out" pipe on the side.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
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Postby torkq » Sat Mar 08, 2008 11:13 pm

How do you then dewater your VO?
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Postby SunWizard » Sat Mar 08, 2008 11:36 pm

From the above post:

I have shown that the CF removes the contaminants so well that I don't mistwash any more.

I dewater and filter with the CF only. I posted this thread for those who don't have a CF. They usually dewater by settling over long periods of time, or evaporative dewatering. There are several threads here about those options.
YVORMV - Your veg. oil results may vary.
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Postby hheynow » Sun Mar 09, 2008 8:26 am

I gave up on mist washing because it caused the whole drum of oil to emulsify. It takes forever for the oil to separate at room temperature. Another handicap is that I'm on well water and the TDS of that raw water is huge. My oil setup is in a shed with no sewer drain and dumping the wash water on my property doesn't cut it. I used the mist washer head sold by Utah Biodiesel.
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Postby Johnno » Wed Mar 12, 2008 6:18 pm

hheynow wrote:I gave up on mist washing because it caused the whole drum of oil to emulsify. It takes forever for the oil to separate at room temperature. Another handicap is that I'm on well water and the TDS of that raw water is huge. My oil setup is in a shed with no sewer drain and dumping the wash water on my property doesn't cut it. I used the mist washer head sold by Utah Biodiesel.


You would have avoided all the problems you describe if you had mist washed hot oil. (55 deg C) Misting cools off the oil too so heat needs to be added as it cools off.
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