Table 3.
Removal efficiencies of preliminary sedimentation and coagulation experiments.
| Coagulants | Samples | pH | tCOD (mg·L−1) | sCOD (mg·L−1) | TKN (mg·L−1) | NH4+-N (mg·L−1) | TP (mg·L−1) | TSS (mg·L−1) | Ca2+ (mg·L−1) | Crude Protein (mg·L−1) |
|---|---|---|---|---|---|---|---|---|---|---|
| Preliminary sedimentation | Inlet wastewater | 5.6 | 4245 | 1621 | 639 | 145 | 53 | 1880 | 1200 | 3996 |
| After settling | 4.0 | 2612 | 1584 | 579 | 133 | 40 | 139 | 1233 | 3617 | |
| * RE (%) | 38 | 2 | 9 | 8 | 25 | 93 | −3 | 9 | ||
| Chitosan 86.4 mg·L−1 |
After coagulation | 10.6 | 1741 | 1463 | 453 | 103 | 5.2 | 39 | 587 | 2829 |
| ** REC (%) | 33 | 8 | 22 | 23 | 87 | 72 | 52 | 22 | ||
| *** ToRE (%) | 59 | 10 | 29 | 29 | 90 | 98 | 51 | 29 | ||
| PAC 17.6 mg·L−1 |
After coagulation | 11.2 | 2116 | 1403 | 448 | 95 | 4.9 | 51 | 673 | 2800 |
| ** REC (%) | 19 | 11 | 23 | 29 | 88 | 63 | 45 | 23 | ||
| *** ToRE (%) | 50 | 13 | 30 | 34 | 91 | 97 | 44 | 30 | ||
| PAA 79.3 mg·L−1 |
After coagulation | 9.8 | 2298 | 1246 | 520 | 146 | 4.2 | 38 | 587 | 3252 |
| ** REC (%) | 12 | 21 | 10 | −10 | 90 | 73 | 52 | 10 | ||
| *** ToRE (%) | 46 | 23 | 19 | −1 | 92 | 98 | 51 | 19 | ||
| Mixture of PAC and PAA 87.3 mg·L−1 |
After coagulation | 11.0 | 1875 | 1645 | 462 | 98 | 4.3 | 44 | 660 | 2888 |
| ** REC (%) | 28 | −4 | 20 | 26 | 89 | 68 | 46 | 20 | ||
| *** ToRE (%) | 56 | −1 | 28 | 32 | 92 | 98 | 45 | 28 |
* RE: Removal efficiency; ** REC: Removal efficiency of coagulation; *** ToRE: Total removal efficiency.