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Effect on BOD and COD of retted water for retting condition.
| Retting condition | Sample code | BOD (mg/l) |
COD (mg/l) |
||
|---|---|---|---|---|---|
| Before retting | After retting | Before retting | After retting | ||
| Concrete Tank 1 (Without natural catalyst) | A | 9.58 | 80.12 | 75.78 | 319.12 |
| Concrete Tank 4 (7.5% natural catalyst) | D | 84.34 | 344.45 | ||
| Existing method (Without catalyst) | E | 78.67 | 328.78 | ||
