Table 3 Physical features of the refinery waste activated sludge.

From: Potential and optimization of two-phase anaerobic digestion of oil refinery waste activated sludge and microbial community study

pH

SCOD mg/L

Alkalinity g/L CaCO3

TS g/L

VS g/L

Soluble Carbohydrates mg/L

Soluble Proteins mg/L

Oil content (% g/g-TS)

TN mg/L

Ratio VS/TS (%)

6.9  ± 0.3

165.0  ± 6.5

1.700  ± 0.2

15.5 ± 0.5

11.5 ± 0.5

16.1 ± 1.0

45.2 ± 1.5

5.6 ± 0.3

158.1 ± 0.8

74.1 ± 0.5

  1. 95% confidence intervals are shown for each value.
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