Skip to Main Content
Table 1

Quality of the wastewater entering the CWs at the Formosa Steel plant, Vietnam, and concentration limits in the Vietnamese standards for industrial wastewater discharges to different recipients (class A and B; QCVN 40:2011/BTNMT)

Variable measuredUnitMean value ± SD (min-max)Standard for industrial wastewater, class AStandard for industrial wastewater, class B
pH – 7.3 ± 0.18 (6.8–7.8) 6–9 5.5–9 
Color Pt/Co 27.8 ± 4.9 (20–39) 50 150 
COD mg/l 23.1 ± 2.6 (14–30) 75 150 
BOD5 mg/l 9.4 ± 2.3 (5 –15.8) 30 50 
TSS mg/l 17.4 ± 2.1 (14–26) 50 100 
Mn mg/l 0.43 ± 0.12 (0.08 –0.75) 0.5 
Fe mg/l 0.33 ± 0.18 (0.01 –0.86) 
TN mg/l 10.5 ± 2.8 (6.1 –19.2) 20 40 
NH4+-N mg/l 0.57 ± 0.19 (0.04 –2.1) 10 
Cr (VI) mg/l <0.003 0.05 0.1 
Cd mg/l <0.0007 0.05 0.1 
Hg mg/l <0.0003 0.005 0.01 
Phenol mg/l <0.01 0.1 0.5 
CN mg/l <0.004 0.07 0.1 
Grease and fats mg/l <0.3 10 
Variable measuredUnitMean value ± SD (min-max)Standard for industrial wastewater, class AStandard for industrial wastewater, class B
pH – 7.3 ± 0.18 (6.8–7.8) 6–9 5.5–9 
Color Pt/Co 27.8 ± 4.9 (20–39) 50 150 
COD mg/l 23.1 ± 2.6 (14–30) 75 150 
BOD5 mg/l 9.4 ± 2.3 (5 –15.8) 30 50 
TSS mg/l 17.4 ± 2.1 (14–26) 50 100 
Mn mg/l 0.43 ± 0.12 (0.08 –0.75) 0.5 
Fe mg/l 0.33 ± 0.18 (0.01 –0.86) 
TN mg/l 10.5 ± 2.8 (6.1 –19.2) 20 40 
NH4+-N mg/l 0.57 ± 0.19 (0.04 –2.1) 10 
Cr (VI) mg/l <0.003 0.05 0.1 
Cd mg/l <0.0007 0.05 0.1 
Hg mg/l <0.0003 0.005 0.01 
Phenol mg/l <0.01 0.1 0.5 
CN mg/l <0.004 0.07 0.1 
Grease and fats mg/l <0.3 10 

Arithmetic means ± SD for the period September 2017–July 2018.

Close Modal

or Create an Account

Close Modal
Close Modal