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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

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)