Some figures on the biogas?

[chatelot16]

the smaller the methanizer, the more finicky it is and must be carefully monitored

a small methanizer must be driven by a motivated person ... put in public it will always be down

if you confuse the liters of methane and the liter of liquid butane it distorts everything

take liter of gaseous butane into account it is already better, but not yet just because butane is a gas heavier than air, and lighter methane ... and it is m calorific value per kg which is a almost constant

any calculation makes the methanization of the waste makes a weak power

another remark on gas lighting: the good auer sleeves were impregnated with a material carefully selected for maximum light output ... alas it was slightly radioactive ... since the ban on this material some ten years ago year gas lighting has a lousy yield: I would say almost without interest

attention to the impurities of biogas: it is known to put out of use the infrared heating with catalysis: I think it will not be better for the lighting with sleeve auer

the best thing to develop biogas without complicated purification is the generator's internal combustion engine

[Napo dwarf]

would it not be better to speak in kJ or kWh to avoid risky conversions?

[Gaston]

would it not be better to speak in kJ or kWh to avoid risky conversions?

Yes, but these are not necessarily very practical units to measure in the field.

So to clarify:
Methane gas has a density of 0,67 kg / m3 and the combustion of one m3 provides 9,89 kWh (35,6 MJ).

A small methanizer producing 400 liters of methane per week (270 grams), therefore produces approximately 4,96 kWh per week (roughly the equivalent of 1 kg of dry wood or 0,5 liters of fuel oil).

[chatelot16]

and that's the problem, it's weak

5kWh / week makes an average power of 30w

such a small methanizer is an experience to have fun ... really not a useful solution

the work to keep the gas plant running will be the same as small or 100 times larger

except that 100 times bigger to make an average power of 3kw ca deserves to take care of it

[dedeleco]

Gaston is right: as much to dry the vegetable waste in the sun (in a simple solar drier) and then burn it in a stove, because the microbes which digest, take most of the energy for their life and give heat, and leave a residue with more energy.
And obviously, like us, they breathe while making lots of CO2, and a little CH4 if they have no oxygen, with the good bacteria.

In the swamps of Siberia, cold CH4 is stored in cold water in clatharates, while CO2 leaves in the atmosphere or dissolved in water, which makes it a huge gas reservoir which burns him well by heating a little.

http://fr.wikipedia.org/wiki/Clathrate
http://fr.wikipedia.org/w/index.php?tit ... &section=5
http://en.wikipedia.org/w/index.php?tit ... &section=5
http://fr.wikipedia.org/wiki/Hydrate_de_m%C3%A9thane

[mamzelo]

aie aie aie what a pity I was hopeful that my story would work! thank you in any case for your explanations on the density and the equivalences in kWh, these are very complicated information that I could not find ...
Good start, I started an anaerobic digestion test in a small plastic bottle and I marvel every day to see it change!

[Ahmed]

Jean Pain had made methanization tests with "brush compost", his nephew had at home a small demonstrator made up of a cubitainer (flexible plastic bag in a cardboard box) filled with JP compost and water: he opened the tap and with a lighter ignited the outgoing gas (slight internal pressure): result, a beautiful blue flame ...

The advantage of "brush" gas would be that it would not be corrosive like the manure gas used during the Occupation and which gnawed away at the burners, however its efficiency remains very low.

I do not know if this packaging is still easy to find, but it is a size which seems very practical for a demonstrator; moreover, the ground material of all plants is easy to find.

[chatelot16]

but beware, you will be disillusioned when you will try to burn the gas produced ... there is often so much CO2 that it does not burn

to measure I suck up the gas with a syringe, without going to the end of the race, and I then suck up a little caustic soda, and I plug

the soda absorbs all the CO2 and the new position of the piston shows how many there were

what remains is not necessarily methane, it also contains nitrogen but often the whole gas does not burn, and the gas without CO2 burns well when leaving the syringe

[dedeleco]

Gaston is right: as much to dry the vegetable waste in the sun (in a simple solar drier) and then burn it in a stove, because the microbes which digest, take most of the energy for their life and give heat, and leave a residue with more energy.
And obviously, like us, they breathe while making lots of CO2, and a little CH4 if they have no oxygen, with the good bacteria.

In the swamps of Siberia, cold CH4 is stored in cold water in clatharates, while CO2 leaves in the atmosphere or dissolved in water, which makes it a huge gas reservoir which burns him well by heating a little.

http://fr.wikipedia.org/wiki/Clathrate
http://fr.wikipedia.org/w/index.php?tit ... &section=5
http://en.wikipedia.org/w/index.php?tit ... &section=5
http://fr.wikipedia.org/wiki/Hydrate_de_m%C3%A9thane

With enormous reserves, capable of warming the planet from 10 to 15 ° C, like 56 million years ago, and removal of all ice at the poles and the seas 70m higher on the whole planet.

[mamzelo]

And when we burn methane what is left? Are there still polluting elements?
do you know if there are demonstration videos showing how to fill the methanizer during methanization? Chatelot I read your explanations (thank you very much!) But I have trouble seeing how to do it ...