Based on this documents of the Ademe: https://www.econologie.com/agriculture-e ... -2872.html
On page 5 and 19, there are the "input-energy" balances of the 2 installations.
Take as an example the 2ieme page 19:
It takes 2.542 Tons (of which 1264 T is purely liquid or 50% of solid matter) for 156.996 m3 of biogas having produced: 313.000 kwhe and 626.000 kwhth with an overall efficiency of 80 (elec + heat) we thus obtain 1 kwhe of "gross" energy for 174 m000.
Either a biogas ICH of the order of 7,5 kwh (1 m3 of natural gas or 1L of fuel oil = approximately 10 kwh) and therefore 0,75 L of fuel oil.
But it takes 2542/157 = 16,2 kg of "input material" to make 1m3 of biogas or 0,75L of fuel oil.
It is therefore roughly 16,2 / 0,75 = 21,6 kg 50% liquid (at least) to make 1 L.
By approximating and to have an order of value, it is necessary 20 kg of material (50% of liquid) to make 1L of fuel oil.
The "methanogenic" power increases with the% of dry matter, on the other hand I do not know in what proportions (the grass, rich in cellulose, has one of the best methanogenic power).
Whatever the order of magnitude is: Depending on the material, between 10 and 20Kg material must be used to make the equivalent of one L of fuel oil under optimum yield conditions (bacteriology and ideal T ° conditions, agitation, ph ... etc). We quickly understand that this is not the solution that will replace the annual 2000L of a house ... unless you have 20 40 tons of biomethanisable material so a VERY large garden or a farmer friend ...
Here are some methanogenic powers recovered on the net and from some design offices:
in M3 biogas / T of Mat. Brute
Used grease 800
531 food residues
530 Treated Seeds
485 corn silo drying waste
400 Bleaching Lands
395 flotation greases
395 soybean / margarine oil
375 fish oil
373 Spring Rafts
327 Fall Rafts
Canning companies effluent 270
230 Fines and Spathes
225 Molasses
Corn silage 195
195 corn straws
175 Alcohol
Green waste (mowing) 85
85 Steroids
75 distillation residues
Cattle manure 70
Drum brews 60
42 hen manure
25 cattle manure
Palmiped manure 17
15 piglet manure
Pig manure 12
12 Gestation Sow Manure
of course, these are rates for standard products. To get a better idea, you have to balance the MS / MB and MO / MS rates.