'biogas volume' is a correct and usable phrase in written English.
For example, you could use it in the sentence, "The biogas volume released by the plant increased significantly this year."
In summary, microorganisms addition increased biogas volume and the methane mole fraction in it.
Biogas volume was measured every 24 h by a wetted glass syringe sized 50 100 mL.
The biogas volume was corrected using standard temperature and pressure conditions.
Furthermore, the addition of 20 mg/L Fe NPs and 20 mg/L Fe3O4 magnetic NPs significantly increased the biogas volume (p < 0.05) by 1.45 and 1.66 times the biogas volume produced by the control, respectively.
Furthermore, the addition of 1 mg/L Co NPs and 2 mg/L Ni NPs significantly increased the biogas volume (p < 0.05) by 1.64 and 1.74 times the biogas volume produced by the control, respectively.
A comparison with Fig. 1 shows that this is not reflected by an increase in total biogas volume or methane content of the biogas in either compartment.
The daily average generated biogas volumes were as follows: from maize silage 3.20 L day−1, from co-fermentation 3.15 L day−1, and from algal-bacterial mixture 2.20 L day−1.
Also the analysis by means of histograms between the biogas volumes (quantity) generated under different temperature and pH values was proposed.
Methane formed between 53.0 ± 0.6 and 57.6 ± 0.0%% of the biogas produced by volume.
To optimize the digestion benefits in terms of biogas production, waste volume reduction and waste impact on the environment, many research projects have begun in the past 10 years (Mata-Alvarez et al. 2011).
