ĐÁNH GIÁ KHẢ NĂNG TỰ LÀM SẠCH VÀ KHẢ NĂNG TIẾP NHẬN CHẤT Ô NHIỄM CỦA NƯỚC SÔNG NHUỆ Ở ĐIỀU KIỆN MÔ PHỎNG TRONG PHÒNG THÍ NGHIỆM

Tóm tắt

The self purification capacity and the pollutants receiving capacity of Nhue river were calculated by
the 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 total
phosphorus (TP). The study result showed that in aerobic conditions, the self purification rate (Lls) of
COD and NH4
+
was the highest, as 15.5 mg/L per day and 1.78 mgN/L per day respectively. The self
purification rate for TP in different conditions ranged from 0.20 to 0.28 mgP/L per day. The maximum
reception capacity (Ltn) for NH4
+
in mixing and aerobic conditions was 0.8 mgN/L per day; Ltn for TP
in aerobic conditions and mixing was 0.2 mgP/L per day, in static conditions Ltn for TP ranged from
0.1 to 0.2 mgP/L per day; Ltn for COD, in the aerobic conditions, mixing and static conditions could be
up to 240 mg/L per day.
Key words: self purification capacity, pollutants receiving capacity, self purification rate, Nhue river