[Digestion] Test Message

Mon Nov 8 01:13:36 CST 2021

 In the case of soil bacteria, the soil provides them with all the minerals
that they need but it is C that they lack. I discovered in 2010 that the
soil bacteria proliferated when sugar was added to the soil. In the case of
a biogas digester using food waste as feedstock, the bacteria have access
to a lot of C but the minerals are a limiting factor. By introducing soil
into the digester, the bacteria get all the minerals that they need.
Yours A.D.Karve

On Mon 8 Nov, 2021, 4:52 AM , <tmiles at trmiles.com> wrote:

> Interesting conclusions. There are now many peer reviewed papers on
> biochar addition to digesters. Result vary according to biochar feedstock,
> processing conditions, and likely with digester feed such as food waste or
> biosolids. Positive results in solids removal, COD removal, methane
> production and ammonia nitrogen reduction have stimulated further research.
>
>
>
> Tom
>
>
>
> *From:* Digestion <digestion-bounces at lists.bioenergylists.org> *On Behalf
> Of *Anand Karve
> *Sent:* Sunday, November 07, 2021 8:31 AM
> *To:* For Discussion of Anaerobic Digestion <
> digestion at lists.bioenergylists.org>
> *Subject:* Re: [Digestion] Test Message
>
>
>
> We had filled the biochar into a nylon net-bag and placed the bag into the
> digester. In this way, the biochar remained in the digester as long as we
> wanted it to be there. The bag was removed from the digester only after we
> found that the biochar was no longer effective. We do not recommend
> application of biochar to a biogas digester. The experiment was conducted
> only to find out how the biochar affected the performance of a biogas
> plant. Now that I know the role played by biochar as a donor of minerals,
> we are using ordinary field soil instead of biochar. The universal presence
> of green plants in nature shows that all soils in the world have all the
> minerals that living beings need.
>
> Yours
>
> A.D.Karve
>
>
>
> On Sun 7 Nov, 2021, 1:55 PM , <tmiles at trmiles.com> wrote:
>
> AD,
>
>
>
> It is great to hear from you. Many thanks for your observations and
> experience with biochar. The digesters that we know of that are adding
> biochar to food waste find that there are a number of benefits as you have
> experienced. They feed the biochar to the digester continuously along with
> the food waste and remove it with the digestate. They probably benefit from
> the minerals as well as pH buffering. As far as I know the biochar does not
> accumulate in the digester. What we have seen so far are results from
>  experiments at the lab scale and reports from some industrial scale use.
> We haven’t heard of biochar being used on the household scale. I wonder if
> others on the list have added biochar to digesters.
>
>
>
> Kind regards,
>
>
> Tom
>
>
>
> *From:* Digestion <digestion-bounces at lists.bioenergylists.org> *On Behalf
> Of *Anand Karve
> *Sent:* Saturday, November 06, 2021 10:33 PM
> *To:* For Discussion of Anaerobic Digestion <
> digestion at lists.bioenergylists.org>
> *Subject:* Re: [Digestion] Test Message
>
>
>
> 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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