The phrase "a decrease in biogas" is correct and usable in written English.
It can be used when discussing changes in the production or availability of biogas, often in scientific or environmental contexts.
Example: "The recent study indicated a decrease in biogas production due to the lower availability of organic waste."
Alternatives: "a reduction in biogas" or "a decline in biogas".
This entails a periodic cost of emptying and cleaning the digesters, a decrease in biogas production and complications in maintenance.
Over-acidification led to a decrease in biogas production, and as a result, the experiment was stopped after 212 test days.
Although all the OLR fluctuations produced a decrease in biogas and methane production, the digesters exposed twice to glycerol showed faster recovery towards stable conditions after the second OLR change.
This results in a decrease in biogas production after a certain treatment period and a process failure if no external nutrients and buffering agents are added [ 5].
Figure 2 presents the results for the various mixtures, showing a decrease in the biogas yield when E. nuttallii biomass was added.
Temperature shocks from 35 to 30 °C and again from 30 to 32 °C led to a decrease in the biogas production rate, but it rapidly resumed the value of the control reactor.
A decrease in the biogas yield from 80to60%0 % also largely affects the net present value.
A decrease in the biogas yield from 80to60%0 % also largely affects the NPV.
In scenario B, it has also been shown that assuming zero degradation of the polysaccharides in AD resulted in a slight decrease in biogas production.
Various ages of cow manure were sampled, analysed and used as an AD feedstock and it was found that as cow manure aged the amount biogas produced from anaerobic digestion was decreased; a reduction in biogas production of 5.76% was found over two months, and in the subsequent two months the reduction rate was found to accelerate, leading to a 16.92% reduction after four months.
Furthermore, an analysis of the standard deviation of biogas and power production throughout the whole trial in comparison to the standard deviation before the trial shows a decrease in standard deviation of 48.5% for biogas production and of 8.7% for power production.
