Research Article
Polychlorinated Biphenyls in the Centralized Wastewater Treatment Plant in a Chemical Industry Zone: Source, Distribution, and Removal
Table 1
The concentrations (means ± SD) and contribution of PCBs discharged by the largest dyeing chemical industrial group entering the WWTP.
| | PCBs (pg/L) | Mother liquor of manufacture | Treated mother liquor (entering the WWTP) | Raw wastewater in the WWTP | Contribution rate to the WWTP by the group (%) |
| | Indicator PCB congener | | PCB-28 | 3482.8 ± 764.1 | 242.3 ± 96.2 | 173.5 ± 76.4 | 11.2% | | PCB-52 | 162.74 ± 46.1 | 180.7 ± 45.9 | 249.1 ± 32.5 | 5.8% | | PCB-101 | 6.5 ± 2.7 | 4.1 ± 2.8 | 5.3 ± 1.8 | 6.2% | | PCB-118 | 96.26 ± 30.3 | 26.8 ± 14.4 | 48.7 ± 22.6 | 4.4% | | PCB-138 | 61.18 ± 18.5 | 177.9 ± 46.7 | 61.5 ± 21.2 | 23.1% | | PCB-153 | 85.62 ± 26.4 | 203.2 ± 35.4 | 89 ± 25.4 | 18.3% | | PCB-180 | 8.78 ± 3.7 | ND | 3.1 ± 0.8 | — | | Sum indicator PCBs | 3903.9 ± 680.8 | 835 ± 241.4 | 630.2 ± 64.9 | 10.7% |
| | Dioxin-like PCB congener | | PCB-77 | 5897.46 ± 1004.1 | 212.9 ± 63.6 | 114.4 ± 42.2 | 14.9% | | PCB-81 | 2.7 ± 0.85 | 0.26 ± 0.2 | 0.13 ± 0.1 | 16.0% | | PCB-105 | 15.32 ± 6.8 | 8.1 ± 2.8 | 18.6 ± 7.1 | 3.5% | | PCB-114 | 5.7 ± 3.4 | 0.8 ± 0.14 | 0.45 ± 0.1 | 14.2% | | PCB-123 | 11.1 ± 6.4 | 4.4 ± 1.4 | 7.9 ± 1.4 | 4.5% | | PCB-126 | 2.04 ± 2.4 | 1.5 ± 1.4 | 1.9 ± 1.4 | 6.3% | | PCB-156 | 5 ± 6.1 | 8.7 ± 2.8 | 4.8 ± 1.4 | 14.5% | | PCB-167 | 18.4 ± 17.2 | 13 ± 5.6 | 13.8 ± 4.2 | 7.5% | | PCB-169 | 9.06 ± 5.2 | 0.6 ± 0.6 | 0.35 ± 0.3 | 13.7% | | PCB-189 | 1.68 ± 1.4 | 1.9 ± 2.0 | 0.4 ± 0.3 | 38.0% | | Sum DL-PCBs | 5968.5 ± 995.3 | 252.2 ± 58 | 162.7 ± 33.3 | 12.4% |
| | Other PCB congener | | PCB-11 | 24870.2 ± 14707 | 18210.7 ± 7636 | 10321.6 ± 763 | 14.1% | | PCB-15 | 1398.8 ± 240.4 | 607.5 ± 233 | 241.6 ± 84.8 | 20.1% | | PCB-19 | 25.56 ± 17.0 | 9.4 ± 9.9 | 7.1 ± 7.1 | 10.6% |
| | Mono-CBs | 9621.5 ± 4610.3 | 892.4 ± 240 | 831.4 ± 84.8 | 8.6% | | Di-CBs | 32599.6 ± 20265 | 23518 ± 9758 | 12233.10 ± 1004 | 15.4% | | Tri-CBs | 6900.54 ± 1517.4 | 467.5 ± 125 | 636.60 ± 169 | 5.9% | | Tetra-CBs | 20411.54 ± 10449 | 627.9 ± 132 | 957.50 ± 141 | 5.2% | | Penta-CBs | 344.26 ± 118.8 | 84.2 ± 32.5 | 202.50 ± 84.8 | 3.3% | | Hexa-CBs | 671.42 ± 138.6 | 651.8 ± 77.8 | 342.10 ± 113 | 15.2% | | Hepta-CBs | 78.7 ± 14.9 | 171.4 ± 29.7 | 221.30 ± 21.2 | 6.2% | | Octa-CBs | 219.16 ± 22.2 | 75.2 ± 32.5 | 125.60 ± 21.2 | 4.8% | | Nona-CBs | 67.08 ± 32.8 | 58 ± 19.8 | 40.10 ± 32.5 | 11.6% | | Deca-CBs | 25.22 ± 18.4 | 13.3 ± 8.5 | 27 ± 18.4 | 3.9% |
| | PCBs | 70939.02 ± 15635 | 26559.7 ± 9123 | 15617.2 ± 1691 | 13.6% |
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Flow rate of the treated mother liquor: 8,000 m3/d; flow rate of raw wastewater in the WWTP: 100,000 m3/d; ND, not detected.
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