Table 1. Chemical composition of primary clarifier effluent and MFC effluent.
| Primary clarifier effluentb | MFC effluentc | Removal ratio (%) | |
| COD (mg/L)a | 263.3 | 36.8 | 86 |
| BOD (mg/L)a | 181.4 | 6.2 | 97 |
| TSS (mg/L)a | 116.0 | 22.3 | 81 |
| Turbidity (NTU) | 88.7 | 41.2 | 54 |
| Nitrate-N (mg/L) | 0.03 | 0.03 | 0 |
| Nitrite-N (mg/L) | 0.15 | <0.01 | >93 |
| Ammonia-N (mg/L) | 32.4 | 26.2 | 19 |
| Sulfate (mg/L) | 262.1 | 218.1 | 17 |
| Heavy metal conc. (µg/L) | |||
| Fe | 1688 | 1027 | 39 |
| Sr | 1120 | 1010 | 10 |
| Al | 717 | 120 | 83 |
| Mn | 125 | 129 | −3 |
| Cu | 82 | 23 | 72 |
| Zn | 79 | 33 | 58 |
| Mo | 12 | 3 | 75 |
| Cr | 6 | 1 | 80 |
a
COD = chemical oxygen demand, BOD = biological oxygen demand, and TSS = total suspended solid.
b
Primary clarifier effluent was collected on day 225 and was directly added to the MFC.
c
The MFC effluent was collected on day 239.