WVO filtration setup

Waste Vegetable Oil – WVO Filtering and Dewatering

YouTube video of a very nice two-tank WVO filtering and dewatering system.  First tank (55 gal drum) is a settling tank, modified to add a cone bottom, with water/sediment draw off valve.  Tank is heated, insulated, open top with two stacked fine mesh screen baskets (200 and 100 micron) to dump the raw WVO into.  Clean screens with hot water and biodegradable soap in between uses, can continue to reuse. . Both drums have sight glass, and drain valve. Heater is an electric band heater with thermostat.

Second drum is a holding tank. It allows running a new batch before completely using the last. Oil is pumped from 1st to 2nd tank through a whole house triple cartridge filter (20, 5, 1 micron) setup. And from 2nd (holding) tank to car, via filler hose with nozzle. Ball valves on each tank select function.

Misc notes: Heat oil to 160ºF for 2-3 hours, then let it cool to 80F before pumping through filters.  Tanks are mounted on raised stands. Add pressure gauge on filter line (to help know when to change) and thermometer in settling tank.)  Install switch on transfer pump (clearwater from harbor freight) . Put insulated but loose-fitting lid on settling tank during heating. Helps keep the heat in, but allows water vapor to escape. Pipe it so that from holding tank to dispenser hose pumps through inline filters again for a second pass.  Nice clean system avoids having to use jugs, cubies, funnels, mess, etc.

Another informative site on how to filter/dewater WVO. Quoting:

…[heating] is a critical part of filtering the used vegetable oil. This is the part that settles out all of the water and hydrogenated oils from the oil you want to use as fuel. The Heater Element heats the oil up to around 180 degrees, where it will stay for about 3 hours, the heater is then turned off and the oil is allowed to settle for 8 hours. This step takes the longest and is considered one of the most important steps.

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