Open Access
Table 4
Physical and chemical analysis of digestate.
| Parameter | Result | Unit | Methods |
|---|---|---|---|
| pH | 7.53 | H+ Activity | SM 9040 B |
| Total solids (TS) | 1.96 | % | ASTM D2974-20 |
| Volatile solids (VS) | 0.52 | % | ASTM D2974-20 |
| Alkalinity | 166 | mg/L | SM 2320 B |
| Dry solid matter | 1.44 | % | ASTM D2974-20 |
| Moisture content | 98.04 | % | ASTM D2974-20 |
| Total nitrogen (TN) | 1535 | mg/L | Kjeldahl |
| Ammonia-N | 4.80 | mg/L | EPA 1690 |
| Phosphorus | 192.51 | mg/L | EPA 200.7 |
| Potassium | 2916.87 | mg/L | EPA 200.7 |
| Sulphur (S) | 221.92 | mg/L | EPA 200.7 |
| Oil and grease | 2542 | mg/L | SM 5520 B |
| Biological oxygen demand (BOD) | 10,200 | mg/L | SM 5210 B |
| Cation exchange capacity (CEC) | 9.50 | mg/L | EPA 200.7 |
| Chemical oxygen demand (COD) | 21600 | mg/L | SM 5220 D |
| Chlorine (Cl) free | <0.01 | mg/L | SM 4500 Cl G |
| Dissolved oxygen (DO) | 0.41 | mg/L | SM 4500-O G |
| Electrical conductivity (EC) | 30,800 | μS/cm | SM 2510 B |
| Hydrogen sulphide (H2S) | 0.015 | mg/L | SM 4500-S2-D |
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