As a well-known regenerated energy, so called bio-gas with methane as main component could be gene - rated in sludge digestion.
2
甲烷作为瓦斯、天然气、沼气等的主要成分，是易燃易爆气体。
Methane is inflammable and explosion hazard gas as the basis of mash gas, firedamp and rock gas.
3
沼气，主要成分为甲烷，由植物残体在与空气隔绝的条件下经自然分解而成，沼气主要作燃料。
Marsh gas it is composed mainly of methane which is naturally decomposed from the residue of plants under the condition of air isolation, marsh gas is used mainly as fuel.
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