Jason,
Sorry for the delayed response, but I was in the midst of
"experimenting" with my own "sludge" oil.
I settle my WVO before pouring the clear dry portion into 55 gal
storage drums. I use the oil from the top 3/4 of the drums for processing
into BD. After three years I decided to empty the tanks one-by-one. I
accumulated a total of almost 100gal (~380L) of thick, gooey sludge from the
bottoms of 8 tanks. The sludge contained water and titrated significantly
higher than the oil above it.
I had experimented with treating WVO with the glycerin "cocktail" from
BD production and decided to try it with the "sludge" oil. Treated with the
glycerin mix, oil that had resembled butterscotch pudding at 60F (~15C), was
liquid at the same temp. It had much less water and titrated lower (3.5 -
3.7ml of 0.1%KOH/L lowered to
~ 2.5). A test batch of the "pudding" oil ----> incomplete reaction with
much soap. I have successfully processed three batches of the "treated"
sludge and am running the BD as "summer fuel" in my car and my wife's car.
The BD clouds a bit at 55F (~12C), but flows fine. No trouble starting even
on some cool mornings (~ 40F/~5C). The BD produced can be used as summer
fuel for cars or as fuel for my heating system in the cold weather.
The original post had been sent to a couple of veg oil groups, but I
thought biodiesel homebrewers might benefit from knowing that they don't
have to dispose of their "bottom of the barrel" veg oil.
There was some discussion of treating WVO with the glyc. prod earlier
in the year.
Search archives "Treating WVO with Glycerin".
I'd be happy to go over the process I follow if anyone's interested.
With recent discussions about problems acquiring WVO it might be good to be
able to use what we previously would have disposed of (???) or turned down.
Tom
----- Original Message -----
From: "Jason Mier" <[EMAIL PROTECTED]>
To: <sustainablelorgbiofuel@sustainablelists.org>
Sent: Thursday, May 15, 2008 4:21 AM
Subject: Re: [Biofuel] WVO Sludge Disposal - Cross posted
>
> try this. its written in terms of glycerine, but i think junk grease and
> fryer slime would work as well.
>
> http://journeytoforever.org/biodiesel_glycerin.html#burn
>
> you could also make a huge pile of these "logs" and dump them a handful at
> a time into the compost, also, further down-page is a topic i particularly
> like; anaerobic digestion- making NatGas and a liquid fertilizer for your
> own personal use.
>
> this information is also in the JtF library:
>
> http://journeytoforever.org/biofuel_library/MethaneDigesters/MDToC.html#ToC
>
> although it has been suggested that you might want to compost the sludge
> product before using it as a fertilizer.
>
>
>> Date: Wed, 14 May 2008 19:00:26 -0400
>> From: [EMAIL PROTECTED]
>> To: sustainablelorgbiofuel@sustainablelists.org;
>> [EMAIL PROTECTED]
>> Subject: [Biofuel] WVO Sludge Disposal - Cross posted
>>
>> What are you doing with your WVO sludge? I know this topics been
>> discussed
>> in the past but, it seems only to a limited degree. I have two needs -
>> the
>> first is long term - how am I going to handle the sludge from my regular
>> use? I use WVO in my car and in my boiler.
>>
>> The second concern is more immediate...I have a fair amount of WVO sludge
>> (probably around 100 gallons) and I need to find a eco-friendly solution
>> for
>> disposing of it. I think 100 gallons is more than my compost pile can
>> handle. Furthermore, some of the oil that I had was less than ideal
>> quality
>> so the sludge really stinks. I also think that I could dispose of it one
>> cubie at a time in my trash pickup but, that is not eco-friendly at all.
>>
>> One thing is certain - I have to be more selective about the restaurants
>> that I get my oil from.
>>
>> Thanks in advance,
>> Ken
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