Table 2.
Conventional parameters of the effluents from different stages of the rapid Fenton process of BDFW at second-scale intervals.
| Parameter | Average value ± standard deviation | |||
|---|---|---|---|---|
| Secondary effluent | Fenton effluent | Floatation effluent | ||
| COD | (mg·L−1) | 140 ± 3 | 77 ± 3 | 76 ± 3 |
| removal efficiency | / | 45% ± 2% | 46% ± 2% | |
| SCOD | (mg·L−1) | 110 ± 3 | 71 ± 3 | 70 ± 3 |
| removal efficiency | / | 35% ± 3% | 36% ± 3% | |
| DOC | (mg-C·L−1) | 35 ± 2 | 26 ± 2 | 25 ± 2 |
| removal efficiency | / | 26% ± 3% | 29% ± 3% | |
| BOD5 | (mg·L−1) | 3 ± 1 | 1 ± 1 | 2 ± 1 |
| removal efficiency | / | 67% ± 33% | 33% ± 33% | |
| TN | (mg-N·L−1) | 48 ± 2 | 47 ± 2 | 46 ± 2 |
| removal efficiency | / | 2% ± 2% | 4% ± 2% | |
| NH3-N | (mg-N·L−1) | 0.04 ± 0.01 | 0.03 ± 0.01 | 0.02 ± 0.01 |
| removal efficiency | / | 25% ± 25% | 50% ± 25% | |
| TP | (mg-P·L−1) | 4.19 ± 0.05 | 1.14 ± 0.05 | 1.21 ± 0.05 |
| removal efficiency | / | 73% ± 1% | 71% ± 1% | |
| Inhibitory effect (%) | 51 | 31 | 30 | |
Experimental conditions: H2O2 dosage = 128 mg·L−1, [H2O2]:[Fe2+] mole ratio = 1:2, reaction time = 24 s, pH = 3–4.