| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for estimating density of ammonia gaseously dispersing into a biogas from a fermentation liquid, a method for adjusting density of ammonia in the fermentation liquid by using the method for estimating, and a method and system for efficiently producing the biogas by using the a method for adjusting.SOLUTION: The problem can be solved by a method for estimating, according to expression (1): density of ammonia= A*exp(B*pH of fermentation liquid), where A and B are each a constant, density (ammonia mg/biogas L) of ammonia dispersing into a biogas from a fermentation liquid when circulating the biogas between the fermentation liquid and impurity absorbing liquid by generating the biogas from the fermentation liquid by methane fermentation, supplying the generated biogas to the impurity absorbing liquid, thereby removing ammonia included in the biogas, and supplying the biogas with ammonia removed therefrom into the fermentation liquid from the impurity absorbing liquid. |
