Biogas - Carbon Nitrogen Ratios
Biogas is a mixture of gases produced by anaerobic (absence of oxygen) bacterial breakdown of organic matter. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste.
Carbon Nitrogen ratios in biogas produced from different raw materials are indicated below:
| Source | Carbon - Nitrogen Ratio |
|---|---|
| Alfalfa hay | 18 : 1 |
| Bagasse from sugarcane or sorghum stalks | 150 : 1 |
| Chicken manure | 25 : 1 |
| Clover | 2.7 : 1 |
| Cow dung | 25 : 1 |
| Cow urine | 0.8 : 1 |
| Grass clippings | 12 : 1 |
| Kitchen refuse | 6 - 10 : 1 |
| Lucerne | 2 : 1 |
| Pig droppings | 20 : 1 |
| Pig urine | 6 : 1 |
| Potato tops | 25 : 1 |
| Sawdust | 200 - 500 : 1 |
| Seaweed | 80 : 1 |
| Straw | 60 - 200 : 1 |
| Sewage sludge | 13 : 1 |
| Silage liquor | 11 : 1 |
| Slaughterhouse wastes | 3 - 4 : 1 |
When the Carbon Nitrogen ratio exceeds approx. 30 - the biogas production diminish.
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