| Item | SS Reduction (%) | VSS Reduction (%) | Growth rate of earthworm weight (%) | Increase rate of earthworm density (%) | Increase rate of earthworm biomass (%) | Filter’s maximum sludge capability (g/L) |
| R1 | 52.87 | 60.60 | 26.47 | 11.67 | 40.45 | 12.95 |
| R2 | 50.23 | 57.91 | 31.41 | 7.55 | 40.55 | 11.59 |
| Variation ratio | −4.99% | −4.58% | 18.64% | −35.29% | 0.25% | −10.50% |
| Effect | ↓ | ↓ | ↑ | ↓ | - | ↑ |