The main objective of this study was to find out whether
a combination of technical and nature-based treatment processes
suited for small- and middle-sized companies can
meet the discharge requirements corresponding to 50 mg/L
biochemical oxygen demand (BOD5), 30 mg/L total nitrogen
(total-N), 6 mg/L total phosphorus (total-P) and
0.1 mg/L total cyanide according to Vietnam Standard
TCVN 5945 class B (MONRE ), and whether it can
be operated reliably.