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实际上,提高沼气产量,既可以通过提高其产气总量,也可以通过提高产气中的甲烷含量。甲烷的含量主要取决于用料和微生群落的特性。谷物秸秆和谷壳等的纤维含量高而含氮量低,因此,喂饲秸秆的反刍动物的粪便其甲烷的含量一般只占产气量的50％。然而,如果发酵用料的碳氮比适当(C:N约25),则甲烷的含量可高达70％。在大规模沼气生产中,已经采用其本身所产的气体加热沼气池。然而,在某种情况下可采用丙烷作为沼气加热的补充。若从经济和实际应用上来考虑,这种办法不适用于小型(3—10米~3)沼气池;而应寻找投资少、维修简便,又省劳力的取代办法。
In fact, increasing biogas production can be achieved either by increasing its total gas production or by increasing the methane content of the gas. The content of methane depends mainly on the characteristics of the materials and microbial communities. Cereal straws and chaff are high in fiber and low in nitrogen, so fecal matter in straw fed ruminants usually accounts for only about 50% of the methane produced. However, if the fermenting feedstock has a reasonable C: N ratio (C: N of about 25), the methane content can be as high as 70%. In large-scale biogas production, digesters have been used to heat biogas production using their own gas. However, propane can be used as a supplement to biogas heating in some cases. If economic and practical considerations, this approach does not apply to small (3-10 m ~ 3) digesters; and should look for less investment, easy maintenance, but also labor-saving alternative.