452 10 g-VS/L 1/4 (g-VS/g-VS) g g (C/N ratio) 20-40 C/N ratio C) N) C/Nratio (10.1) 3 5 g-VS/L /4 (g-VS/g-VS) mL mL 0 78% (w/w) 38 16 (w/w)