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The Impact of Raw and Composted Food Waste Anaerobic Digestates on Soil Organic Carbon Management: A Pot Study
Abstract Purpose Ever increasing food waste production has promoted anaerobic digestion and composting for its proper management, producing a relevant amount of recycled organic waste (OW) for possible agricultural uses. However, little is known regarding soil carbon management using this type of OW. Methods In this study, an anaerobic digestate from the wet digestion of food waste (WETD), and one from the dry-batch process (DRYD), along with their respective composts (WETC and DRYC), were utilized in a pot test over two growing cycles (84 + 84 days), with and without mineral nitrogen (N) fertilization, and were compared with a bio-waste compost (BWC) and a chemical reference (Chem). At the end of the two growth cycles (days 84 and 168), the ryegrass dry biomass (DW) and the N uptake were assessed. Results The pot soil was analyzed for soil organic carbon (SOC) and the potassium permanganate (KMnO4) oxidizable fraction (CL) as well as δ13C and Δ13C. At day 84, the SOC (g kg− 1) was the highest in DRYD and DRYC (8.53) > WETD and WETC (7.71) = BWC (7.86) > Chem (6.68), and performed similarly at day 168. At day 84, the carbon management index (CMI) was > 100% in all the organic treatments in comparison with Chem, except for WETD. At day 168, a + 30% CMI was registered in WETD and WETC> BWC> DRYD and DRYC> Chem. Conclusion This pattern was related to a generally marked δ13C depletion being confirmed by Δ13C, thus indicating the conservation of the carbon form compost, this very likely being related to the preferential lignin accumulation.
Novelty statementThere is increasing interest in improving soil carbon management; to this aim, the re-utilization of recycled organic waste is often claimed to be safe, successful and sustainable. However, little research has been carried out in dealing with this topic as regards food waste which is an ever-increasing source of organic matter, possibly recycled for agricultural uses. Food waste anaerobic digestates and composts can have a homogeneous 13C natural abundance signature, thus allowing the study of its fate in soil. By so doing, this study represents the first attempt to use this technique in this field. Moreover, coupled with studying the carbon management index, this study represents a first insight into the context of the rational soil carbon management in a succession of organic-mineral fertilization strategies.
The Impact of Raw and Composted Food Waste Anaerobic Digestates on Soil Organic Carbon Management: A Pot Study
Abstract Purpose Ever increasing food waste production has promoted anaerobic digestion and composting for its proper management, producing a relevant amount of recycled organic waste (OW) for possible agricultural uses. However, little is known regarding soil carbon management using this type of OW. Methods In this study, an anaerobic digestate from the wet digestion of food waste (WETD), and one from the dry-batch process (DRYD), along with their respective composts (WETC and DRYC), were utilized in a pot test over two growing cycles (84 + 84 days), with and without mineral nitrogen (N) fertilization, and were compared with a bio-waste compost (BWC) and a chemical reference (Chem). At the end of the two growth cycles (days 84 and 168), the ryegrass dry biomass (DW) and the N uptake were assessed. Results The pot soil was analyzed for soil organic carbon (SOC) and the potassium permanganate (KMnO4) oxidizable fraction (CL) as well as δ13C and Δ13C. At day 84, the SOC (g kg− 1) was the highest in DRYD and DRYC (8.53) > WETD and WETC (7.71) = BWC (7.86) > Chem (6.68), and performed similarly at day 168. At day 84, the carbon management index (CMI) was > 100% in all the organic treatments in comparison with Chem, except for WETD. At day 168, a + 30% CMI was registered in WETD and WETC> BWC> DRYD and DRYC> Chem. Conclusion This pattern was related to a generally marked δ13C depletion being confirmed by Δ13C, thus indicating the conservation of the carbon form compost, this very likely being related to the preferential lignin accumulation.
Novelty statementThere is increasing interest in improving soil carbon management; to this aim, the re-utilization of recycled organic waste is often claimed to be safe, successful and sustainable. However, little research has been carried out in dealing with this topic as regards food waste which is an ever-increasing source of organic matter, possibly recycled for agricultural uses. Food waste anaerobic digestates and composts can have a homogeneous 13C natural abundance signature, thus allowing the study of its fate in soil. By so doing, this study represents the first attempt to use this technique in this field. Moreover, coupled with studying the carbon management index, this study represents a first insight into the context of the rational soil carbon management in a succession of organic-mineral fertilization strategies.
The Impact of Raw and Composted Food Waste Anaerobic Digestates on Soil Organic Carbon Management: A Pot Study
Waste Biomass Valor
Grigatti, Marco (author)
Waste and Biomass Valorization ; 15 ; 4915-4925
2024-08-01
Article (Journal)
Electronic Resource
English
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