1.
This is what I have, but I will look into further for you.
New Waste Stream Specific Information
1. A corn and soybean oil biodiesel manufacturing company produces a
byproduct, glycerine. The glycerine is agricultural grade and looks
similar to thin maple syrup.
2. Notable Constituents
The notable constituents are BOD >100,000 mg/l, COD 1,760,000 mg/l,
and passed a solubility test. All constituents passed the
established Waste Acceptance Criteria.
So it's a commerial operation, and it sounds like they're separating
the glycerine from the rest of the by-product and refining it.
2.
Hi Keith,
Here's what I found out.
The actual BOD was closer to one million that is relflect in the COD value.
>Is that just the glycerin? The by-product of making biodiesel is a
>cocktail of glycerin, soaps (from free fatty acids), excess methanol
>(which can be recovered), and the lye catalyst (NaOH or KPH). There
>is often more soap than glycerin, does the process handle the soap
>too, as well as the high pH?
It's my understanding that the typical process starts with various
oils and at different concentrations, so they have to "shock" the
reaction since they don't know what they are starting with
necessarily. This technique of over treating the reaction requires
more washing the product, which results in more byproduct wastewater
to manage (lye, methanol, etc.).
The customer we are working with explained that their system is
fairly unique in the industry because they have chosen to perform
"precision chemistry" because they pretreat the oils before
beginning the process. By knowing their oils are consistent with
each batch because of the pretreatment, thus their process is
considered by them to be more streamlined. They also generate
minimal byproduct wastewater to manage, and it's fairly pure in that
they generally don't produce soap, have minimal catalyst present,
and minimal generation of methanol.
As for pH, since the chemistry is the anaerobic digester is healthy,
a high pH wasn't much of a concern. If your Volatile
acids:alkalinity ratio is low this acts as a buffer. Our main
concern was foaming with the introduction of glycerin, and we did
see an increase hence the slow feed rate to the digester.
Hope that helps.
Anyone know what this means? I think I do know, somewhere or other,
but it doesn't come to mind.
The actual BOD was closer to one million that is relflect in the COD value.
Thanks!
Keith
Forwarded message from a Journey to Forever reader.
Best wishes
Keith
Hello,
I work at a wastewater treatment plant and I was doing a search on glycerin
and biofuels and came across your website. It's has good information
thanks.
Here's another use of glycerin: Our treatment is accepting the glycerin
from a biofuel producer, we feed it to our digesters, slowly very slowly.
The addition of glycerin has dramatically increased our gas production,
that we run all three engines that produce electricity for our plant and
occasionally need to flare off the excess methane (we have 4 flares).
This might be of interest to your readers that use digestion for
electricity.
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