Table 1.
Consolidated results from the bioelectrochemical treatment of petroleum refinery wastewater (PRW) and Labaneh whey (LW) as co-substrate.
| Experiment No | PRW (%) | LW (%) | Inlet COD (mg/L) | HRT (Days) | Outlet COD (mg/L) | COD degradation rate (kg COD/m3-day) | COD removal efficiency (ξCOD, %) | Outlet pHa | Voltage (mV) | PD (mW/m2) | SPY (W/Kg CODR) | Cell design point (Ω) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C1-C3 | 100 | 00 | 2150 | 5 | 1579 | 0.114 | 26.54 | 7.31 | 410 | 420 | 2.95 | 200 |
| C4-C6 | 95 | 05 | 3010 | 5 | 1873 | 0.227 | 37.77 | 7.18 | 484 | 587 | 2.06 | 200 |
| C7-C9 | 90 | 10 | 3742 | 6 | 2071 | 0.278 | 44.65 | 6.82 | 530 | 702 | 1.68 | 100 |
| C10-C12 | 85 | 15 | 4475 | 6 | 2153 | 0.387 | 51.90 | 6.63 | 577 | 832 | 1.43 | 100 |
| C13-C15 | 80 | 20 | 5328 | 8 | 1966 | 0.420 | 63.10 | 6.34 | 497 | 618 | 0.74 | 100 |
| C16-C18 | 75 | 25 | 6226 | 6 | 3321 | 0.415 | 46.66 | 5.60 | 438 | 479 | 0.66 | 100 |
| C19-C21 | 70 | 30 | 7235 | 4 | 5944 | 0.323 | 17.84 | 4.20 | 330 | 274 | 0.86 | 300 |
All the values presented here are average of 3 cycles.
HRT, hydraulic retention time; VPD, volumetric power density; SPY, specific power yield; PD—power density.
aInlet pH (7.0) was maintained constant in all the experiments.