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Table 1 Percolation trials conditions (a) and composition of OFMSWs and digestates used and of percolates produced (b)

From: Enhanced polyhydroxyalkanoate (PHA) production from the organic fraction of municipal solid waste by using mixed microbial culture

Trial T (°C) Duration (day) OFMSW (kg) Digestate flow rate (L h−1 kg−1 OFMSWw.w.) Percolate produced (L kg−1 OFMSWw.w.) OA produceda (g kg−1 OFMSWw.w.)
a
 Trial 1 30 21 44 0.02 8.03 60.5
 Trial 2 30 21 42.7 0.04 19.3 151
 Trial 3 40 (day 1–8) 30 (day 9–21) 21 43.6 0.08 (1–8 day) 0.04 (9–21 day) 25.57 139
  1. aOA expressed as acetic acid, determined according to the acid titration method [27]
  2. bLimited to percolates, values in the same column followed by the same letter are not statistically different (ANOVA, Tukey test, p < 0.05)
Trial TS (%) VS (%) pH OAa (mg L−1) N-NH4 + (mg L−1)
b
 Trial 1, 2, 3
  OFMSW (average) 24.5 ± 3.9 86.8 ± 2.6 4.3 ± 0 11,663 ± 1.649 304 ± 239
 Trial 1, 2, 3
  Digestate (average) 2.2 ± 0.2 70.8 ± 2.7 8.32 ± 0.1 3448 ± 1.591 2065 ± 343
 Trial 1
  Percolate 1 (P1) 2.4 ± 0.49ab 71.2 ± 2.2b 6.91 ± 0.19a 7540 ± 1,474b 2231 ± 130b
 Trial 2
  Percolate 2 (P2) 1.9 ± 1.1a 66.5 ± 2.8a 6.99 ± 0.61a 7831 ± 1,775b 2412 ± 472b
 Trial 3
  Percolate 3 (P3) 2 ± 0a 73 ± 2a 6.99 ± 0.32a 5437 ± 818a 1784 ± 117a
  1. aOA expressed as acetic acid, determined according to the acid titration method [27]
  2. bLimited to percolates, values in the same column followed by the same letter are not statistically different (ANOVA, Tukey test, p < 0.05)