I. i water is one of the essential elements for all life activities on earth, making an extremely important contribution to human life, socio-economic development and ecological balance. rivers are the main source of drinking water for urban and rural areas. especially, people in rural areas and people with low income often use river water directly, however, fresh water is currently in a state of serious pollution and shortage. that is why water has become an urgent global problem. currently, water resources are increasingly scarce, declining in both quantity and quality, accompanied by severe droughts and floods, while the demand for water is increasing. causing a water crisis and becoming an urgent global problem [1]. vietnam in general and the mekong river delta in particular are located in the lower mekong river with an abundant amount of alluvium every year suitable for agricultural development, with agricultural output accounting for more than 50% of the country. therefore, this is an industry that has many impacts on surface water quality in the region. agricultural wastewater is a matter of concern because it is difficult to control and originates from different sources, with no identifiable point of pollution originating from. that is the