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Table 1 Operating parameters monitored during continuous feeding of primary and activated sewage sludge to digesters F1–F6

From: Sulfide level in municipal sludge digesters affects microbial community response to long-chain fatty acid loads

  Daysa F1 F2 F3 F4 F5 F6
Specific biogas production (ml g−1VSinput) 0–75 620 ± 55 645 ± 65 650 ± 60 645 ± 65 655 ± 65 680 ± 60
76–132 540 ± 20 580 ± 30 585 ± 40 525 ± 35 530 ± 35 550 ± 20
133–218 525 ± 65 570 ± 100 500 ± 100 505 ± 60 450 ± 90 575 ± 60
Methane (% of biogas) 0–75 61 ± 0 61 ± 0 61 ± 0 61 ± 1 63 ± 1 63 ± 0
76–132 63 ± 1 62 ± 2 62 ± 3 64 ± 1 62 ± 4 64 ± 1
133–218 61 ± 1 62 ± 1 61 ± 1 63 ± 1 62 ± 1 63 ± 1
Gaseous H2S (ppm) 0–75 < 20 < 20 < 20 < 20 < 20 < 20
76–132 < 20 < 20 < 20 280 ± 100 310 ± 115 250 ± 105
133–218 < 20 < 20 < 20 510 ± 100 440 ± 70 470 ± 60
Total solids (% of total weight) 0–75 2.1 ± 0.2 1.9 ± 0.2 2.1 ± 0.2 2.1 ± 0.2 2.1 ± 0.2 2.1 ± 0.2
76–132 2.1 ± 0.1 2.2 ± 0.1 2.1 ± 0.1 2.3 ± 0.1 2.3 ± 0.2 2.3 ± 0.2
133–218 2.0 ± 0.2 2.1 ± 0.2 2.2 ± 0.3 2.2 ± 0.3 2.4 ± 0.2 2.2 ± 0.0
Volatile solids (% of TS) 0–75 62 ± 1 62 ± 1 63 ± 1 63 ± 1 62 ± 2 63 ± 1
76–132 61 ± 1 61 ± 1 62 ± 2 58 ± 2 57 ± 4 58 ± 2
133–218 62 ± 0 63 ± 1 65 ± 3 57 ± 1 59 ± 3 56 ± 0
  1. aDays 0-75: start-up phase; Day 76: start of sulfide addition to F4, F5, and F6; Day 133: start of LCFA addition to F2, F3, F4, and F5