Ajwal Dsouza, G.W. Price, Mike Dixon, Thomas Graha. CO 2 demand-supply balance in a composting-based closed-loop plant factories.. 2022. agriXiv.2022.00161
DOI：10.31220/agriRxiv.2022.00161
声明：预印本系统所发表的论文仅用于最新科研成果的交流与共享，未经同行评议，因此不建议直接应用于指导生产实验。
CO 2 demand-supply balance in a composting-based closed-loop plant factories.
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Abstract: Abstract Carbon dioxide enrichment is a technique employed in controlled environment agriculture (CEA) systems (i.e., vertical farms) to improve crop yield. However, the CO 2 for enrichment is sourced from fossil fuels, increasing the carbon footprint of these operations by adding CO 2 to the atmosphere. Sourcing CO 2 from biowaste instead can be a more sustainable option. Particularly, composting crop residues generated in CEA systems can generate CO 2 while valorizing biowaste. This study assesses the possibility of meeting the CO 2 demand for enrichment in a CEA system by composting residues of baby lettuce - the most common crop grown in CEA systems. Using theoretical modelling, we estimated the CO 2 required to grow baby lettuce in a hypothetical CEA system at an enriched CO 2 concentration of 1000 ppm. The CO 2 derivable by composting lettuce residues generated by a CEA system with two different types of hydroponic system (mat- and plug-based) was determined through aerobic incubation and CO 2 respirometry. Depending on the hydroponic system, composting crop residues generated in the hypothetical CEA system could produce around 1.4-6% of the total CO 2 required for enrichment. Comparing the estimated demand versus supply of CO 2 on a mass basis showed that composting crop residues alone is likely insufficient to meet the enrichment demands of a CEA system growing baby lettuce at 1000 ppm. Additional biomass (e.g., source separated urban biowaste) might be required to meet the CO 2 demand for enrichment solely through composting.
Key words: co 2; composting; cea; enrichment; demand; lettuc提交时间：2022-01-01
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