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Gas Yields and Methane Contents for Various Substrates
- VS = Total volatile solids, e.g. ca. 9% of total liquid manure mass for cows
'Table: '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.
| 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 |
References
- 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
