. ponds and processing industries is high in nitrogen, phosphorus, organic matter content, and therefore has a high chemical oxygen demand (COD) and biological oxygen demand (BOD). In addition, there. mangrove forest. However, it is not possible to discharge to Mangrove areas for bio-filtration, because of the Man and the Biosphere designation the Vietnamese government is unlikely to approve the. TSS, 30 kg N, 3.7 kg P and 4.8 kg N-NH3. The results indicate that the levels of BOD5, COD and TSS increased within the culture period as well as the age of ponds. The concentration of pollutants...