Table 3.
Changes in chemical characteristics of raw swine manure during treatment in the pilot plant. SD are shown in parentheses.
| Parameter | Unit | B1 | B2 | B3 | B4 | B5 | Average B1–B5 |
|
|---|---|---|---|---|---|---|---|---|
| pH | - | Initial | 7.71 | 7.26 | 7.53 | 7.75 | 7.75 | 7.60 (0.21) |
| Final | 8.91 | 8.49 | 8.55 | 8.20 | 8.88 | 8.61 (0.30) | ||
| TAN | g L−1 | Initial | 2.79 | 2.82 | 3.05 | 2.92 | 2.30 | 2.78 (0.28) |
| Final | 1.99 | 1.92 | 1.54 | 2.51 | 1.22 | 1.84 (0.49) | ||
| Alkalinity | mg CaCO3 L−1 | Initial | 12794 | 11239 | 10033 | 13673 | 10126 | 11573 (1618) |
| Final | 7552 | 7937 | 5420 | 11345 | 6793 | 7809 (2198) | ||
| Removed TAN | % | - | 28.53 | 31.87 | 49.46 | 14.30 | 46.82 | 34.20 (14.37) |
| Initial alkalinity: Initial TAN ratio | - | - | 4.59 | 3.99 | 3.29 | 4.68 | 4.41 | 4.19 (0.57) |
| Alkalinity consumed | mg CaCO3 L−1 | - | 5242 | 3302 | 4613 | 2328 | 3333 | 3764 (1158) |
| Alkalinity consumed: TAN removed ratio | - | - | 6.59 | 3.68 | 3.06 | 5.57 | 3.10 | 4.40 (1.60) |