[Digestion] Test Message

[Anand Karve]

Glad to hear from you and also glad to know that the list is still
surviving. I am still working on food waste and kitchen waste as feedstock.
One of the drawbacks of this feedstock was that one could load the digester
with only a small quantity of feedstock at a time. But with our new design,
we have overcome this problem. Now we load all the feedstock into a
predigester. Because of overloading, the pH of the material in the
predigester becomes acidic, but the  new design is such, that the digester
draws in only so much of the acid, as can be converted by it into biogas.
Adding bichar certainly works, but only temporarily. The digester filled
with biochar produced three times as much biogas as was possible without
the biochar, but only for three months,. After 3 months we had to open the
digester and load it again with fresh biochar. This indicated that food
waste does not have enough minerals and that the ash in the biochar served
the bacteria as a source of minerals. One can as well add chemical
fertilizers to the digester to achieve the same results.
Yours
A.D.Karve

On Sun 7 Nov, 2021, 3:31 AM , <tmiles at trmiles.com> wrote:

> Thanks! A lot has happened in anaerobic digestion since the list was last
> active last Spring.
>
>
>
>    1. RNG. While we only have a small number of commercial digesters in
>    the US compared with Europe there is a lot of excitement about Renewable
>    Natural Gas, especially from the American Biogas Council. They report that
>    there are 161 digesters that are now selling RNG and that there is a
>    potential for something like 2000. The contracts for RNG appear attractive
>    but it is not yet clear what the net benefit is to the owner after complex
>    transaction fees are subtracted.  https://americanbiogascouncil.org/
>
>
>
>    1. Food wastes are another emerging feedstock for AD in the US, almost
>    as a pre-treatment for composting the digestate.
>
>
>
>    1. Research has demonstrated the value of adding biochar to AD
>    feedstock with a variety of benefits but we don’t see commercial use of
>    biochar yet in AD either as a digester additive or as an additive to
>    digestate prior to composting.
>
>
>
> Tom
>
>
>
> *From:* Bruno M. <brunom1 at telenet.be>
> *Sent:* Saturday, November 06, 2021 2:31 PM
> *To:* For Discussion of Anaerobic Digestion <
> digestion at lists.bioenergylists.org>; tmiles at trmiles.com
> *Subject:* Re: [Digestion] Test Message
>
>
>
> yep, works perfect Tom.
>
>
>
>
>
> ================================
>
> Op 6-11-2021 om 21:02 schreef tmiles at trmiles.com:
>
> This is a test to see if the list is still available
>
>
>
> Tom Miles
>
> Digestion list Owner
>
>
>
>
>
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