Toward New Value-Added Products Made from Anaerobic Digestate: Part 2—Effect of Loading Level on the Densification of Solid Digestate

A comprehensive understanding of the mechanisms associated with pelletization an anaerobic digestate is necessary to optimize pellet production process and achieve better more sustainable management digestate. This work evaluated behavior during cyclic loading unloading in a closed matrix. The results presented here are continuation those observed previous that effect moisture content on under loading/unloading conditions distribution permanent elastic strain energy demonstrated study was verified present different conditions. Zwick universal machine used for experiments. samples were loaded amplitudes 8, 11, 14, 17, 20 kN 10 cycles. Two distinct levels digestate—10% 22%—were analyzed. confirmed dissipated independent remained relatively constant wide range applied loads. Higher values higher only when loads applied. In studied loads, characteristic differences noted curves regardless load magnitude. increase led strength, but 10%. strength reflect well irreversible conclusions about area enclosed between curves.