The self purification capacity and the pollutants receiving capacity of Nhue river were calculated bythe experimental model in three conditions: static (DO <
2 mg/L)
stirring (2 mg/L DO 4 mg/L)
aerobic (DO >
4 mg/L). The water quality parameters were assessed as COD, NH4+, and totalphosphorus (TP). The study result showed that in aerobic conditions, the self purification rate (Lls) ofCOD and NH4+was the highest, as 15.5 mg/L per day and 1.78 mgN/L per day respectively. The selfpurification rate for TP in different conditions ranged from 0.20 to 0.28 mgP/L per day. The maximumreception capacity (Ltn) for NH4+in mixing and aerobic conditions was 0.8 mgN/L per day
Ltn for TPin aerobic conditions and mixing was 0.2 mgP/L per day, in static conditions Ltn for TP ranged from0.1 to 0.2 mgP/L per day
Ltn for COD, in the aerobic conditions, mixing and static conditions could beup to 240 mg/L per day.Key words: self purification capacity, pollutants receiving capacity, self purification rate, Nhue river