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宜賓微生物發酵后沼氣檢測

信息編號:63931100 發布時間:2025/8/13 9:03:22
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沼氣發酵過程
沼氣發酵主要可分為水解 (液化) 、酸化、乙酸化和甲烷化四個階段,如圖 2-1所示。其中水解是從屬于發酵過程的,而酸化和甲烷化是緊密相連的兩個步驟。生物質物料的水解過程發生在細胞外。水解細菌和發酵細菌首先會分沙特定的細胞胞外酶,將復雜大分子有機物催化水解為小分子化合物。之后,發酵細菌將利用上一步驟生產的水解產物,進一步發酵生成特定的發酵產物,如乙酸、氫氣和二氧化碳等,這些發酵產物可直接被產甲烷細菌利用,生成甲烷和二氧化碳。而另外一些發酵產物,如某些醇類及揮發性脂肪酸類,則需要進一步被氧化,才能被產甲烷細菌利用并轉化為沼氣,通常這是由產甲烷細菌的共生細菌一一產酸細菌完成的。各個階段描述如下。
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