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Sirvi Autor "Kriipsalu, Mait (advisor)" järgi

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  • Pisipilt
    Kirje
    Bio-waste composting in the framework of a circular economy
    (Estonian University of Life Sciences, 2023) Lanno, Marge; Shanskiy, Merrit (advisor); Kriipsalu, Mait (advisor); Kisand, Anu (advisor); Institute of Agricultural and Environmental Sciences; Fuchs, Jacques Gabrie (opponent)
    Organic wastes can be stabilized by composting and turned into solid organic fertilizers and soil improvers, while closing the cycle of nutrients. Evaluation of total nutrient concentrations, as well as safety and hygiene parameters of composts, are regulated; however, some beneficial properties of compost are not reported. The aim of this PhD thesis was to determine the value of fish by-catch, an underutilized type of biowaste, through proximity composting, and increase our knowledge about the properties and added value of various composts. The distribution of phosphorus forms and concentration and properties of humic substances were determined from the fish waste composts and compared with other common types of compost. This study confirmed that proximity composting of fish waste is technologically feasible and meets hygiene requirements according to regulations (temperature 1 h > 70 °C). Composts made from different input materials varied in relative proportions and concentrations of phosphorus forms. Fish waste compost contained the highest concentration of immediately bioavailable phosphorus (6.90–7.75 g P/kg DW; 57–66% of total phosphorus). All selected composts contained humic substances, including humic acids (HA) and fulvic acids (FA), but their concentrations, properties, and relative proportions depended on compost input materials. The HA/FA ratio, reflecting humification, was highest in horse manure compost (7.88) and lowest in chicken waste compost (1.42). Composts revealed similar peaks of excitation/emission matrices of fluorescence spectra for FA, but varied in their HA spectra. In conclusion, this PhD thesis highlights the potential value of small biowaste streams, which have not been sufficiently considered to date. Such waste can be a valuable source material for high-quality composts that can be used to improve the physical and chemical properties of soil, as well as to increase crop yields.