沼氣，化學分子式為CH4，是簡單的有機化合物，甲烷是沒有顏色、沒有氣味的氣體，比空氣輕，它是很難溶于水的氣體，而且是可燃性的，甲烷和空氣成適當比例的混合物，遇火會發生爆炸，所以使用沼氣的時候要慎重，化學性質相當穩定，跟強酸、強堿或強氧化劑（如KMnO4）等一般不起反應。

Biogas, with the chemical formula CH4, is a simple organic compound. Methane is a colorless, odorless gas that is lighter than air. It is difficult to dissolve in water and is flammable. When methane is mixed with air in appropriate proportions, it can explode when exposed to fire. Therefore, caution should be exercised when using biogas. Its chemical properties are quite stable and it generally does not react with strong acids, bases, or oxidants (such as KMnO4).

沼氣是一種新型的可再生能源， 沼氣的燃燒產物中的污染物很少，而且沼氣厭氧發酵技術對工廠廢水、城市生活垃圾、農業廢棄物等有非常好的處理效果， 有積極的環保意義。

Biogas is a new type of renewable energy, and the pollutants in the combustion products of biogas are minimal. Moreover, anaerobic fermentation technology of biogas has excellent treatment effects on factory wastewater, urban household waste, agricultural waste, etc., and has positive environmental significance.

沼氣是一種混合氣體，它的主要成分是甲烷，其次有二氧化碳、硫化氫（H2S）、氮 及其他 一些成分。沼氣的組成中，可燃成分包括甲烷、硫化氫、一氧化碳和重烴等氣體；不可燃成 分 包括二氧化碳、氮和氨等氣體。在沼氣成分中甲烷含量為55%～70%、二氧化碳含量為28%～44%、硫化氫平均含量為0.034%。

Biogas is a mixed gas, mainly composed of methane, followed by carbon dioxide, hydrogen sulfide (H2S), nitrogen, and other components. In the composition of biogas, combustible components include gases such as methane, hydrogen sulfide, carbon monoxide, and heavy hydrocarbons; Non combustible components include gases such as carbon dioxide, nitrogen, and ammonia. The methane content in biogas is 55% to 70%, the carbon dioxide content is 28% to 44%, and the average hydrogen sulfide content is 0.034%.

目前，國內很多廢水厭氧處理的沼氣，CH4含量在50-60%之間，如果選用合適的沼氣發電機組，每立方沼氣可發電2.2-2.6度，而現在很多企業為節省投資，上容量小的機組，每立方沼氣只能發1.8度電。以17000M3/天，熱值為25MJ/M3沼氣為例，每立方沼氣發1.8度電的機組比每方沼氣發2.6度電的機組每年少發400多萬度電。

At present, many domestic anaerobic wastewater treatment biogas plants have CH4 content between 50-60%. If suitable biogas generators are selected, each cubic meter of biogas can generate 2.2-2.6 kWh of electricity. However, many enterprises now use smaller capacity units to save investment, and each cubic meter of biogas can only generate 1.8 kWh of electricity. Taking 17000M3/day and 25MJ/M3 biogas as an example, a unit that generates 1.8 kWh of electricity per cubic meter of biogas generates more than 4 million kWh of electricity per year less than a unit that generates 2.6 kWh of biogas per cubic meter.

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