Biogas and anaerobic digestion of manure in Jühnde

[emlaurent]

For my part, we will conduct a feasibility study of a biogas insatallation to treat 1000 tons of waste.

If you have any information on the combined cycle gas tubines (57% of electricity and 43% of thermal)
or gas generator sets equipped with water doping,
I need advice.

My heat needs are almost zero, I already have two solar water heaters and a brand new vegetable oil boiler.

Waouhh! 1000 tons ?! It's 1000 tons / year?
I imagine you're a farmer to have such waste production? unless you are a producer of energy from waste recovery.

[jpduval53]

Hi everybody

Yes, I am a farmer.

As part of the standardization of farms (mandatory), I chose the little used option of anaerobic digestion.

In most cases, farmers make manure or manure pits uncovered. There is no recovery of methane.

With Aria Scop we are going to experiment with a method that will require more investments than conventional upgrading but less than a German type of anaerobic digestion.

In my case, the animals produce 500 t manure per year and I will recover all or part of the lawns of the city of Laval (between 300 and 1000 tons / year).

But I have to leave you

JP

[Christophe]

Who has an idea of ​​the mass of plants it is necessary to methanize to turn a group of 3kW (which corresponds I believe in a domestic consumption "all electric".

I found this here ( http://www.solagro.org/site/im_user/124 ... climv2.pdf ):

Calculation note of the GWP (= equivalent carbon dioxide) of biogas

For 100 m3 or 72 kg CH4 (or the production of about one tonne of municipal waste):

• Direct emission into the atmosphere: 72 kg CH4 x 21 (equivalence PRG) = 1512 kg eq. CO2.
• Flare combustion: CH4 + 2 O2 -> CO2 + 2 H2O therefore 72 kg CH4 x 44/16 = 198 kg eq. CO2 - a reduction of 1314 kg eq. CO2.
• Valuation: 100 m3 CH4 1 MWh. 1 MWh of oil emits 86 kg C is 315 kg eq. CO2 (natural gas: 205, coal: 473). So the substitution of oil by biogas allows the saving of 315 kg eq. CO2 for 100 m3 methane (3,15 kg eq.CO2 / m3 CH4), ie 21% of the PRG.

In reality, the fermenting biomass would have degraded into CO2 whatever its future. Comparing the "waste storage" system with the carbon cycle would require
remove the fatal emissions of carbon dioxide.
Direct emissions into the atmosphere therefore generate an increase in GHGs up to 1512 - 198 = 1314 kg eq. CO2 for 100 m3 or 72 kg of methane, a coefficient of 18,25 kg eq. CO2 per kg CH4. We will speak of "gross" GWP when we use the coefficient of 21, and of "net" PRG when we reason with respect to another "reference" situation, with the coefficient of 18,25.

Flaring does not increase greenhouse gas emissions.

For recovery, the entire fossil fuel sector (extraction, transport, etc.) should be taken into account, which increases the substitution effect of
the order of 10%.

The valuation by substitution with oil represents 21% of the "gross" PRG, or 24% of the "net" PRG, ie by substituting 100 m3 for methane with fuel oil (with the same energy content), the effect is the same as reducing direct emissions of methane from
24 m3.

[Christophe]

I have just added a presentation document of 2 examples of biomethanisation in France:

https://www.econologie.com/biogaz-agricu ... -2872.html

[Kyos]

Hello

Here are two links that describe the construction of digesters.

The first presents the construction of a very summary flexible digester here
and a video for the same type of digester here

The second, describes the more elaborate construction of a hard digester. It also presents technical data to calculate the necessary volume of a digester here

I wonder what this type of achievement could give in France, and what would be the regulatory framework. We can dream of being able to approach the second example, given the budget announced (about 340 dollars in 2004). As for the first example, 10 € ... But this example, unlike the other, is not even possible.

Do you have an idea of ​​what should be done to adapt the digester hard in our countries, both in terms of regulation and that, perhaps more suggestive, its acceptance in our living environment.

Goods.

[Batistuta]

Hello everyone

In January, I saw a docu on china (on arte)
They use individual skeptic pits to recover methane for household and personal use
There would be several millions in the Chinese countryside
These are semi-hemispherical stratified pits, which are probably rather rudimentary but sufficient for cooking
I have not yet found or inquire more precisely so if someone has an opening on the china to collect some precisions
patrick

I'm working on this with the NGO Initiative Développement
They have implanted something like 500 in China among poor farmers, and will try to mount it too in Africa in a more or less near future!

I will try to share information that I can have! (If you're interested of course!)

[Christine]

Yes !

[jonule]

http://projetbiogaz.skyrock.com/4.html

[the middle]

http://projetbiogaz.skyrock.com/4.html

Hello,
Here's another site that explains how to make a demonstration digester:
http://www.riaed.net/IMG/pdf/Digesteur_ ... n_EDEN.pdf