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Table 2

Mean (n = 80 per sampling site) water quality of the effluent from wetland cells CW1, 2, 3, 4 at Formosa Steel work, Vietnam, for the period September 2017 to July 2018. Arithmetic mean ± SD (min-max) are shown and units are as in Table 1 

Variables measuredWetland cells
CW1CW2CW3CW4
Color 20.6 ± 4.5 (18–30) 19.6 ± 2.8 (17–28) 17.9 ± 2.9 (14–25) 16.7 ± 2.6 (12–21) 
COD 20.2 ± 2.9 (15–29) 19.9 ± 2.0 (14–25) 17.4 ± 3.0 (11–23) 16.7 ± 3.3 (10–24) 
BOD5 7.7 ± 1.6 (6.0–11) 7.8 ± 1.1 (5.6–10.1) 6.7 ± 2.0 (4.9–9.1) 6.5 ± 0.9 (4.2–9.3) 
TSS 15 ± 1.5 (10–22) 14.4 ± 2.5 (8–20) 13.0 ± 2.5 (5–17) 13.4 ± 2.4 (7–18) 
Mn 0.27 ± 0.06 (0.22–0.61) 0.22 ± 0.05 (0.1–0.32) 0.17 ± 0.06 (0.03–0.41) 0.16 ± 0.08 (0.03–0.55) 
Fe 0.22 ± 0.03 (0.06–0.49) 0.25 ± 0.16 (0.04–0.56) 0.18 ± 0.09 (0.03–0.71) 0.17 ± 0.10 (0.02–0.7) 
TN 9.2 ± 1.5 (9.2–17) 9.5 ± 2.4 (8.3–16) 9.2 ± 2.1 (6.5–14.9) 8.9 ± 2.0 (6.1–15.8) 
NH4+-N 0.29 ± 0.08 (0.13–0.67) 0.15 ± 0.03 (0.09–0.42) 0.08 ± 0.02 (0.02–0.69) 0.04 ± 0.01 (0.01–0.14) 
Variables measuredWetland cells
CW1CW2CW3CW4
Color 20.6 ± 4.5 (18–30) 19.6 ± 2.8 (17–28) 17.9 ± 2.9 (14–25) 16.7 ± 2.6 (12–21) 
COD 20.2 ± 2.9 (15–29) 19.9 ± 2.0 (14–25) 17.4 ± 3.0 (11–23) 16.7 ± 3.3 (10–24) 
BOD5 7.7 ± 1.6 (6.0–11) 7.8 ± 1.1 (5.6–10.1) 6.7 ± 2.0 (4.9–9.1) 6.5 ± 0.9 (4.2–9.3) 
TSS 15 ± 1.5 (10–22) 14.4 ± 2.5 (8–20) 13.0 ± 2.5 (5–17) 13.4 ± 2.4 (7–18) 
Mn 0.27 ± 0.06 (0.22–0.61) 0.22 ± 0.05 (0.1–0.32) 0.17 ± 0.06 (0.03–0.41) 0.16 ± 0.08 (0.03–0.55) 
Fe 0.22 ± 0.03 (0.06–0.49) 0.25 ± 0.16 (0.04–0.56) 0.18 ± 0.09 (0.03–0.71) 0.17 ± 0.10 (0.02–0.7) 
TN 9.2 ± 1.5 (9.2–17) 9.5 ± 2.4 (8.3–16) 9.2 ± 2.1 (6.5–14.9) 8.9 ± 2.0 (6.1–15.8) 
NH4+-N 0.29 ± 0.08 (0.13–0.67) 0.15 ± 0.03 (0.09–0.42) 0.08 ± 0.02 (0.02–0.69) 0.04 ± 0.01 (0.01–0.14) 
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