The effect of composting on the production of syngas at H2/ CO = 2 and H2/CO = 3 is presented in Table 6.
The high variability in the concentrations of CO and H2 led to gas mixtures with equally high variability of H2/CO ratios.
All grass and compost samples resulted in syngas formation with H2/CO = 2 but only one grass sample (MB-G) and five composts (i.e., R-C, TF-C, TO-C, MC-C and FL-C) resulted in the production of syngas with H2/CO = 3. A statistically significant effect of composting on syngas formation with H2/CO = 2 was observed as well (p < 0.0001).
This a direct result of an increased release of H2 and an increased and/or decreased release of CO caused by composting.
Among the NHG samples,
the concentration of syngas with H2/CO = 2 was relatively consistent and the sample exhibiting the highest concentration of syngas as a grass (MB) also exhibited the highest concentration as a compost.
An opposite pattern was,
however,
observed for the HG samples;
the sample with the lowest amount of syngas (FB) resulted also in the highest formation of syngas as compost.
In addition,
the MB and FB composts resulted in the lowest H2 and the highest CO yields, correspondingly.
Once more,
no statistically significant moderation effect of composting was observed between NHG and HG based upon the fixed effects regression.
As expected, an increase of H2/CO ratio to the value of 3 increased the formation of syngas even greater.
The effect of composting on the production of syngas at H2/ CO = 2 and H2/CO = 3 is presented in Table 6. The high variability in the concentrations of CO and H2 led to gas mixtures with equally high variability of H2/CO ratios. All grass and compost samples resulted in syngas formation with H2/CO = 2 but only one grass sample (MB-G) and five composts (i.e., R-C, TF-C, TO-C, MC-C and FL-C) resulted in the production of syngas with H2/CO = 3. A statistically significant effect of composting on syngas formation with H2/CO = 2 was observed as well (p < 0.0001). This a direct result of an increased release of H2 and an increased and/or decreased release of CO caused by composting. Among the NHG samples, the concentration of syngas with H2/CO = 2 was relatively consistent and the sample exhibiting the highest concentration of syngas as a grass (MB) also exhibited the highest concentration as a compost. An opposite pattern was, however, observed for the HG samples; the sample with the lowest amount of syngas (FB) resulted also in the highest formation of syngas as compost. In addition, the MB and FB composts resulted in the lowest H2 and the highest CO yields, correspondingly. Once more, no statistically significant moderation effect of composting was observed between NHG and HG based upon the fixed effects regression. As expected, an increase of H2/CO ratio to the value of 3 increased the formation of syngas even greater.
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