Table 1 Characteristics of the sweet potato starch wastewater (SPSW) and biofertilizer
Parameter (s) | SPSW | Biofertilizer | SMIA* |
|---|---|---|---|
pH | 6.3 ± 0.1 | 6.8 ± 0.2 | 5.0–8.0 |
Total solids (g/L) | 23 ± 0.3 | 17 ± 0.2 | - |
Viable count (109/mL) | - | 6.16 ± 0.36 | ≥0.2 |
Protease (U/mL) | - | 37.8 ± 1.21 | ≥15 |
IAA | - | 1.09 ± 0.05 | - |
Concentration (mg/L) | |||
COD | 19083 ± 555 | 15416 ± 777 | - |
Total Nitrogen | 1940 ± 81 | 1641 ± 94 | - |
NO3−-N | 34 ± 1.7 | 26 ± 1.6 | - |
Total phosphorus | 70.6 ± 4.4 | 67.8 ± 0.8 | - |
K | 758 ± 58 | 422 ± 37 | - |
Fe | 8.6 ± 1.1 | 6.5 ± 0.4 | - |
Mg | 67.3 ± 5.5 | 64.0 ± 2.6 | - |
Zn | 1.8 ± 0.06 | 1.6 ± 0.08 | - |
Cu | 0.43 ± 0.09 | 0.11 ± 0.06 | - |
Cd | 0.24 ± 0.02 | 0.23 ± 0.01 | ≤10 |
As | 0.23 ± 0.05 | 0.21 ± 0.07 | ≤75 |
Cr | 0.25 ± 0.07 | 0.25 ± 0.04 | ≤150 |
Pb | 0.91 ± 0.05 | 0.87 ± 0.04 | ≤100 |
