DOI: 10.57755/d0q4-hz15
title: Carbon monoxide (CO) concentration during food waste composting: profiles with 6th-degree polynomial modeling

description: <p>This dataset contains carbon monoxide (CO) concentration values expressed in ppm, measured in the headspace of composting bioreactors during the food waste composting process. It also includes graphical representations of these values over time, along with fitted functions describing the data and the corresponding R² coefficients.</p><p>The information is organized into four files, each representing a different aeration variant used during the composting process (10 dm³/min for 0, 0.5, 1, and 1.5 minutes, files: &#34;Aeration 0&#34;, &#34;Aeration 0.5&#34;, &#34;Aeration 1&#34;, and &#34;Aeration 1.5&#34;, respectively). Within each aeration variant, the results are further divided based on the composting temperature (45°C, 60°C, and 70°C; sheets: &#34;45C&#34;, &#34;60C&#34;, &#34;70C&#34;, respectively) and different food waste (FW) to mineral material (gravelite, G) ratios: 1:0, 1:1, and 1:2 (columns: &#39;1:0&#39;, &#39;1:1&#39;, &#39;1:2&#39; in each sheet, respectively).</p><p>First, the dataset provides the individual replicate values for each FW:G ratio (n &#61; 3 for each composting variant). Following that, the arithmetic mean of the replicates is presented. Finally, the data is visualized for each variant as a plot showing CO concentration (ppm, Y-axis) over time (days, X-axis). Each plot includes a fitted 6th-degree polynomial function, the equation of the function, and the R² coefficient.</p>
description: <p style="font-size:14px;letter-spacing:normal;background-color:rgb( 251 , 251 , 251 );color:rgba( 0 , 0 , 0 , 0.87 );font-family:&#39;raleway&#39; , sans-serif !important;line-height:1.1 !important"><span style="font-size:12.04px">A model food waste (FW) mixture (potatoes, rice, pasta, onions, apples, bananas, tomatoes, lettuce, bread, cheese, and ham) was composted.</span></p><p style="font-size:14px;letter-spacing:normal;background-color:rgb( 251 , 251 , 251 );color:rgba( 0 , 0 , 0 , 0.87 );font-family:&#39;raleway&#39; , sans-serif !important;line-height:1.1 !important"><span style="font-size:12.04px">To adjust the organic matter content (OMC) within the bioreactors, the FW was mixed with a mineral bulking material, gravelite (G), at volumetric ratios of 1:0, 1:1, and 1:2 (FW:G). These mixtures corresponded to dry organic matter content values of approximately 95%, 40%, and 20%, respectively.</span></p><p style="font-size:14px;letter-spacing:normal;background-color:rgb( 251 , 251 , 251 );color:rgba( 0 , 0 , 0 , 0.87 );font-family:&#39;raleway&#39; , sans-serif !important;line-height:1.1 !important"><span style="font-size:12.04px">The total mass of the material placed in each bioreactor varied depending on the FW:G ratio and ranged from approximately 130 g to 170 g.</span></p><p style="font-size:14px;letter-spacing:normal;background-color:rgb( 251 , 251 , 251 );color:rgba( 0 , 0 , 0 , 0.87 );font-family:&#39;raleway&#39; , sans-serif !important;line-height:1.1 !important"><span style="font-size:12.04px">The composting experiment was carried out over a period of 7 days in 900 mL bioreactors equipped with forced aeration. The bioreactors were placed in thermostatic chambers (ST3, POL-EKO, Wodzisław Śląski, Poland) set to constant temperatures of 45°C, 60°C, and 70°C. Each unit was sealed with a metal cap fitted with two connectors and silicone tubing. One connector remained closed throughout the experiment, while the other was operated with a Hoffmann clamp to allow intermittent connection to a portable gas analyzer (DP-28, Nanosens, Wysogotowo, Poland).</span></p><p style="font-size:14px;letter-spacing:normal;background-color:rgb( 251 , 251 , 251 );color:rgba( 0 , 0 , 0 , 0.87 );font-family:&#39;raleway&#39; , sans-serif !important;line-height:1.1 !important"><span style="font-size:12.04px">Measurements of carbon monoxide (CO) concentration</span><span style="font-size:12.04px"> were performed twice daily at 9:00 AM and 4:00 PM. Each measurement session lasted approximately 2 minutes, continuing until stable readings were obtained. Following each session, the analyzer was temporarily disconnected to allow the internal sensors to return to baseline values (CO ~0 ppm) before subsequent use.</span></p><p style="font-size:14px;letter-spacing:normal;margin-bottom:0px;background-color:rgb( 251 , 251 , 251 );color:rgba( 0 , 0 , 0 , 0.87 );font-family:&#39;raleway&#39; , sans-serif !important;line-height:1.1 !important"><span style="font-size:12.04px">Aeration was administered once daily using an oxygen concentrator (OxyFlow-10, GESS, Poland), operating at a flow rate of 10 dm³∙min⁻¹ for 0, 0.5, 1 or 1.5 minutes.</span></p>