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Table 2 Chemical composition of the substrates used in the MMC selection and PHA accumulation processes

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

Substrate COD (mg L−1) N-NH4 + (mg L−1) P tot (mg L−1) C (mmol L−1) N-NH4 + (mmol L−1) P (mmol L−1) Organic acids composition (%, weight basis, HB precursors/HV precursors)
OFMSW-supernatantin 1 1304 ± 10aa 46.7 ± 4.9a 3.1 ± 0.3a 34.4 ± 0.3a 2.6 ± 0.3a 0.1 ± 0a 59.7/40.3
OFMSW-supernatantin 2 1322 ± 37° 56.2 ± 7.5a 3.6 ± 0.4a 34.9 ± 1a 3.1 ± 0.4a 0.12 ± 0.01a 51.2/48.8
OFMSW-supernatantin 3 1231 ± 63a 58.4 ± 8.1a 5.6 ± 0.6b 32.5 ± 1.7a 3.2 ± 0.5a 0.18 ± 0.02b 67.8/32.2
OFMSW-supernatantacc. 1 7591 ± 54a 28 ± 4a 16.9 ± 2.3a 200 ± 2a 1.6 ± 0.2a 0.55 ± 0.07a 57.2/42.8
OFMSW-supernatantacc. 2 7879 ± 87a 29.1 ± 2a 19.8 ± 3a 207.8 ± 2.3a 1.6 ± 0.1a 0.64 ± 0.11a 52/48
OFMSW-supernatantacc. 3 7253 ± 98a 26.8 ± 3a 31.1 ± 5.2b 191.3 ± 2.6a 1.5 ± 0.2a 1 ± 0b 65.1/34.9
  1. aBy separating OFMSW-supernatantsin from OFMSW-supernatantsacc., values in the same column followed by the same letter are not statistically different (ANOVA, Tukey test, p < 0.05)