Table 1 Chemical and physical composition of liquid digestate*
Indicator | Mean value ± standard deviation |
|---|---|
pH | 7.75 ± 0.13 |
Total solids (g/kg) | 3.10 ± 0.02 |
Volatile solids (g/kg) | 1.59 ± 0.03 |
Volatile solids (%TS) | 51.36 ± 0.77 |
Total suspended solids (mg/L) | 785.55 ± 118.10 |
Turbidity (FAU) | 472.52 ± 99.14 |
Apparent color (units) | 12,078.10 ± 2079.80 |
True color (units) | 10,998.13 ± 2015.33 |
Total chemical oxygen demand (mgO2/L) | 7990.00 ± 540.00 |
Soluble chemical oxygen demand (mgO2/L) | 7890.00 ± 485.00 |
Total volatile fatty acids (mg/L) | 3183.42 ± 989.67 |
Ammonium nitrogen (mg/L) | 581.50 ± 81.50 |
Nitrates (mg/L) | 1020.16 ± 103.70 |
Nitrites (mg/L) | 10.21 ± 2.71 |
Total nitrogen (mgN/L)** | 685.74 ± 87.29 |
Orthophosphates (mg/L) | 350.27 ± 20.11 |
Zinc (mg/L) | 15.04 ± 1.62 |
Aluminum (mg/L) | 10.35 ± 8.58 |
Copper (mg/L) | 5.70 ± 0.43 |
Iron (mg/L) | 4.07 ± 2.12 |
Chlorides (mg/L) | 217.19 ± 30.11 |
Sulfides (μg/L) | 1553.00 ± 607.08 |
Sulfates (mg/L) | 0.00 ± 0.00 |
