Gas Yields and Methane Contents for Various Substrates
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Substrate | Gas yield (l/kg VS*) |
Methane content (%) |
---|---|---|
Pig manure | 340-550 | 65-70 |
Cow manure | 90-310 | 65 |
Poultry droppings | 310-620 | 60 |
Horse manure | 200-300 | |
Sheep manure | 90-310 | |
Barnyard dung | 175-280 | |
Wheat straw | 200-300 | 50-60 |
Rye straw | 200-300 | 59 |
Barley straw | 250-300 | 59 |
Oats straw | 290-310 | 59 |
Corn straw | 380-460 | 59 |
Rape straw | 200 | |
Rice straw | 170-280 | |
Rice seed coat | 105 | |
Flax | 360 | 59 |
Hemp | 360 | 59 |
Grass | 280-550 | 70 |
Elephant grass | 430-560 | 60 |
Cane trash (bagasse) | 165 | |
Broom | 405 | |
Reed | 170 | |
Clover | 430-490 | |
Vegetables residue | 330-360 | |
Potato tops/greens | 280-490 | |
Field/sugar beet greens | 400-500 | |
Sunflower leaves | 300 | 59 |
Agricultural waste | 310-430 | 60-70 |
Seeds | 620 | |
Peanut shells | 365 | |
Fallen leaves | 210-290 | 58 |
Water hyacinth | 375 | |
Algae | 420-500 | 63 |
Sewage sludge | 310-740 |
Table B1: Gas yields and methane contents for various substrates at the end of a 10-20 day retention time at a process temperature of roughly 30C.
Source: Production and Utilization of Biogas in Rural Areas of Industrialized and Developing Countries, Schriftenreihe der gtz, No. 97, pg. 63, after: Felix Maramba, Biogas and Waste Recycling - The Phillipine Experience; Metro Manila, Phillipines, 1978
* VS = Total volatile solids, e.g. ca. 9% of total liquid manure mass for cows
.