Abstract
This research aimed at evaluating the quality of anaerobic compost from solid substrate anaerobic digesters for potential use as a soil amender. A factorial experiment 4 × 2 × 2 was run. The factors were feedstock type, temperature in reactors (35 and 55 °C) and mass retention time (MRT, 16 and 23 days). The feedstocks used consisted of four mixtures of food waste (FW) and lignocellulosic fraction (LG): 100% FW, 67% FW-33% LG, 33% FW-67% LG and 100% LG which were designated as FS1, FS2, FS3 and FS4, respectively. The anaerobic compost coming from feedstocks with increasing proportion of lignocellulosic fraction (FS3 and FS4) were of higher quality and gave the lowest chemical oxygen demand, biochemical oxygen demand, volatile organic acids and total ammonia nitrogen concentrations in the extract and the highest germination indices. Heavy metal concentrations in all the anaerobic composts were lower than the maximum levels indicated in USA and European compost quality standards. However, high total oxygen uptake, moderate to high concentrations of volatile organic acids and ammonia, and germination indices under 60% indicated that the anaerobic compost was not suitable for direct use as a soil improver.
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Poggi-Varaldo, H.M., Gómez-Cisneros, E., Rodríguez-Vázquez, R., Trejo-Espino, J., Rinderknecht-Seijas, N. (2002). Unsuitability of Anaerobic Compost from Solid Substrate Anaerobic Digestion as Soil Amendment. In: Insam, H., Riddech, N., Klammer, S. (eds) Microbiology of Composting. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08724-4_13
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DOI: https://doi.org/10.1007/978-3-662-08724-4_13
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