Abstract

The paper presents some results on study of the carrying capacity of Vam Co Dong (VCð) river, section crosing Ben Luc district, Long An province. The MIKE 11 – hydrodynamic and water quality model was used in this study. Main pollutant sources from industry, agriculture, domestic and runoff in the areas were calculated for the simulation. Model results showed that the carrying capacity of the Vam Co Dong river from 2009 to 2015 and to 2020 is limited in dry season, while during the transition of rainny and dry season, the recieving capacity for BOD is about 10 tons/day and 15 tons/day for COD which is rather low. The recieving capacity is increased in rainny season with 75tons/days for BOD and 145 tons/day for COD. Especially, during flooding season (September and OcTober) the receiving capacity can raise up to 150 tons/day for BOD and 300 tons/day for COD. For others water quality parameters, the Vam Co Dong river can recieve certain loadings at some specific sections.Based on the calculated carrying capacity of Vam Co Dong river, we can determine which areas is allowed for wastewater discharge with limited pollution loadings so that the river will not be deteriorated in the future.