Column experiment programme and results summary
| Test case | Mechanism | Sucrose concentration: g/l | Back-pressure: kPa | Testing period: days | Initial porosity | Initial hydraulic conductivity K0: m/s | Final hydraulic conductivity Kf: m/s | Reduction ratio |
|---|---|---|---|---|---|---|---|---|
| MIBF_R1 | MIBF | 40 | 0 | 64·1 | 0·40 | 3·9 × 10−4 | 8·9 × 10−6 | 0·023 |
| MIBF_R2 | 40 | 0 | 77·4 | 0·38 | 3·4 × 10−4 | 1·2 × 10−6 | 0·004 | |
| MIBF_R3 | 40 | 300 | 67·4 | 0·38 | 3·5 × 10−4 | 4·5 × 10−6 | 0·013 | |
| MIBF_R4 | 160 | 300 | 38·2 | 0·39 | 3·6 × 10−4 | 5·4 × 10−6 | 0·015 | |
| EIBF_R1 | EIBF | 40 | 0 | 49·2 | 0·38 | 3·2 × 10−4 | 4·6 × 10−6 | 0·014 |
| EIBF_R2 | 40 | 0 | 38·4 | 0·39 | 3·6 × 10−4 | 4·8 × 10−6 | 0·013 |
| Test case | Mechanism | Sucrose concentration: g/l | Back-pressure: kPa | Testing period: days | Initial porosity | Initial hydraulic conductivity | Final hydraulic conductivity | Reduction ratio |
|---|---|---|---|---|---|---|---|---|
| MIBF_R1 | MIBF | 40 | 0 | 64·1 | 0·40 | 3·9 × 10−4 | 8·9 × 10−6 | 0·023 |
| MIBF_R2 | 40 | 0 | 77·4 | 0·38 | 3·4 × 10−4 | 1·2 × 10−6 | 0·004 | |
| MIBF_R3 | 40 | 300 | 67·4 | 0·38 | 3·5 × 10−4 | 4·5 × 10−6 | 0·013 | |
| MIBF_R4 | 160 | 300 | 38·2 | 0·39 | 3·6 × 10−4 | 5·4 × 10−6 | 0·015 | |
| EIBF_R1 | EIBF | 40 | 0 | 49·2 | 0·38 | 3·2 × 10−4 | 4·6 × 10−6 | 0·014 |
| EIBF_R2 | 40 | 0 | 38·4 | 0·39 | 3·6 × 10−4 | 4·8 × 10−6 | 0·013 |
All the column tests were conducted with the coarse sand packs at a pulsed mode of refilling, where 5 PV (or 60 ml) of the refilling solutions were injected at an interval of 72–96 h. The reduction ratio is defined as the ratio of the final hydraulic conductivity to the initial hydraulic conductivity – that is, Kf/K0.
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