Dataset on process gas concentrations during composting of biowaste mixtures with controlled moisture levels

<p>The dataset contains information on the concentrations of process gases in the headspace of bioreactors during laboratory-scale biowaste composting (individual bioreactor volume &#61; 0.9 L): methane (CH₄, %), carbon dioxide (CO₂, %), oxygen (O₂, %), hydrogen sulfide (H₂S, ppm), and carbon monoxide (CO, ppm).</p><p>The composted material consisted of a mixture of biowaste: cherry tree branches, fresh grass cuttings, and model food waste prepared based on Valta et al. (2019) (doi: 10.1177/0734242X18823943), in a mass ratio of 4:1.5:1, respectively. Composting was conducted at 45°C.</p><p>Gas concentration values were recorded over a 14-day composting period, with one measurement taken per day (resulting in 14 measurements per replicate). The dataset includes the exact dates and times of all measurements.</p><p>Concentration values are provided for three experimental variants differing in the initial moisture content of the biowaste:</p><p>Reactors 1–4 correspond to measurements for biowaste with an initial dry matter content of 68.4%,</p><p>Reactors 5–8 – biowaste with an initial dry matter content of 78.4%,</p><p>Reactors 9–12 – biowaste with an initial dry matter content of 87.4%.</p><p>During the composting process, distilled water was added every three days as follows: 10 mL to reactors 1–4, 5 mL to reactors 5–8, while reactors 9–12 were incubated without any water addition throughout the process.</p>