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Table 1 Summarising numbers on scrubber washwater concentrations, fluxes and impact on water quality for scenario HIGH (20% scrubbers)

From: The impact of scrubber discharge on the water quality in estuaries and ports

  Units Conc. docks (1) WQS (2) CLOSED loop—scenario HIGH OPEN loop—scenario HIGH
Discharge conc. (90th perc.) Flux kg year−1 (20% scrubbers) Conc. increase docks Discharge conc. (90th perc.) Flux kg year−1 (20% scrubbers) Conc. increase docks
Cr µg L−1 3.34 5 10,120 448 0.122 45.0 342 0.093
Cu 8.38 7 1780 78 0.021 130 998 0.273
Ni 5.86 4* 6060 268 0.073 127 994 0.272
Zn 32.9 20 1524 66 0.018 260 1863 0.509
V 3.94 4 25,000 1107 0.303 500 4069 1.112
Ace ng L−1 4.92 60 745 3.28E−02 8.96E−03 648 5.27 1.44
Acy 7.20 4000 185 7.87E−03 2.15E−03 536 4.34 1.19
Ant 2.67 100* 446 1.96E−02 5.37E−03 308 2.50 0.685
Fluoran 9.51 6.3* 661 2.88E−02 7.89E−03 478 3.84 1.05
Flu 3.72 2000 2370 1.05E−01 2.86E−02 1200 9.81 2.68
Naph 8.24 2000* 6370 2.82E−01 7.70E−02 6960 57.0 15.6
Phe 7.95 100 6970 3.08E−01 8.43E−02 3700 30.3 8.28
Pyr 13.0 40 554 2.40E−02 6.55E−03 1220 9.90 2.71
Total PAH 58.1   22,200 9.80E−01 2.68E−01 13,620 111 30.4
  1. (1) Average values for total concentrations in the harbour docks
  2. (2) Water quality standards (WQS) from the EU WFD (*) or Flanders (dissolved concentrations for metals, total concentrations for PAHs)