Table 2.
Concentration of PAHs in dewatered sludge (ng/g), soil standards (ng/g), and toxic equivalent factors.
| Ring | Compounds | Dewatered Sludge | Soil Standards | TEF a | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 23 November | 2 December | 9 December | 17 December | MHSPE b | RCLs c | CJ/T d | |||||||
| 2 | NAP | 76.10 | 51.22 | 45.87 | 41.53 | 15 | - | - | 0.001 | ||||
| 3 | ANE | 10.48 | 32.85 | 58.21 | 62.44 | - | - | - | 0.001 | ||||
| ANA | 134.88 | 18.80 | 0.34 | 13.52 | - | - | - | 0.001 | |||||
| FLU | 58.81 | 48.74 | 40.28 | 36.22 | - | - | - | 0.001 | |||||
| PHE | 135.52 | 76.88 | 84.54 | 87.32 | 50 | - | - | 0.001 | |||||
| ANT | 11.28 | 7.13 | 4.41 | 2.62 | 50 | - | - | 0.01 | |||||
| 4 | FLT | 59.58 | 57.47 | 49.07 | 45.61 | 15 | - | - | 0.001 | ||||
| PYR | 18.55 | 7.88 | 13.21 | 11.28 | - | - | - | 0.001 | |||||
| BaA e | 18.59 | 4.53 | 25.49 | 29.28 | 20 | 160 | - | 0.1 | |||||
| CHR e | 93.61 | 58.39 | 64.74 | 68.13 | 20 | 16,000 | - | 0.01 | |||||
| 5 | BbF e | 47.77 | 29.64 | 21.72 | 17.91 | - | 160 | - | 0.1 | ||||
| BkF e | 19.24 | 9.87 | 11.60 | 14.11 | 25 | 1600 | - | 0.1 | |||||
| BaP e | 26.06 | 13.37 | 3.56 | 4.88 | 25 | 16 | 2000 | 1 | |||||
| DBA e | 29.72 | 17.40 | 9.53 | 6.32 | 25 | 16 | - | 1 | |||||
| 6 | BghiP | 117.91 | 46.79 | 43.54 | 44.13 | - | - | - | 0.01 | ||||
| IcdP e | 73.23 | 67.69 | 109.94 | 121.87 | 20 | 160 | - | 0.1 | |||||
| ∑PAHs-carc | 308.21 | 200.88 | 246.58 | 262.52 | - | - | - | - | |||||
| ∑LMW PAHs | 427.08 | 235.62 | 233.65 | 243.66 | - | - | - | - | |||||
| ∑HMW PAHs | 504.25 | 313.01 | 352.41 | 363.54 | - | - | - | - | |||||
| ∑PAHs | 931.33 | 548.64 | 586.06 | 607.20 | - | - | 5000 | - | |||||
| ∑PAHs-carc/∑PAHs | 33.1% | 36.6% | 42.1% | 43.2% | - | - | - | - | |||||
a Toxic equivalent factors [18]; b Soil standard in the Netherlands [9]; c Resident Soil in Regional Screening Levels provided by USEPA [7]; d Disposal of sludge from municipal wastewater treatment plant-Control standards for agricultural use (CJ/T 309-2009) [10]; e Carcinogenic PAHs. LMW = low molecular weight (i.e., ≤3 rings); HMW = high molecular weight (i.e., 4–6 rings); ∑PAHs-carc = the total concentration of seven carcinogenic PAHs.