Abstract
The paper presented results of the comparative assessment of nutrient absorption capacity by plants, including reed grass (Phragmites australis L.) and vetiver (Vetiveria zizanioides L.). The constructed wetland models were designed with experiments (i) - Loading 1 (T1): reed grass (S1), vetiver (V1) + control (C1); (ii) - Loading 2 (T2): reed grass (S2), vetiver (V2) + control (C2); (iii) - Load 3 (T3): reed grass (S3), vetiver (V3) + control (C3). The study investigated the surface water quality parameters including nutrients such as TKN (Total Kieldalh Nitrogen), ammonium (NH4-N), nitrite (NO2-N), nitrate (NO3-N), total phosphorus (TP) and phosphate (PO43-). Results showed that there was significantly decreasing change related to pollutant concentration in the tanks. The studied results showed that the water treatment efficiency of Loading 1 (T1) possessed highly nutrient absorption capacities such as nitrogen and phosphorus. Comparing the nitrogen and phosphorus removal efficiency, there was no statistically significant difference between reed grass and vetiver in the same loading (P>0.05). In general, in the same loading levels, the plants’ nutrient removal efficiencies were often higher than the control experiments (P<0.05). The effluent findings illustrated some parameters of water quality that met to National Technical Regulation of surface water quality for agricultural irrigation purposes (QCVN 08-MT:2015/BTNMT). Therefore, the constructed wetland technology obtained highly effective characteristics and supplying the environmental friendly advantages.
Highlights
The constructed wetland models were designed with experiments
significantly decreasing change related to pollutant concentration in the tanks
The studied results showed that the water treatment efficiency of Loading 1
Summary
Đánh giá khả năng xử lý chất ô nhiễm dinh dưỡng bằng cây cỏ sậy (Phragmites australis L .) và vetiver (Vetiveria zizanioides L.). TÓM TẮT Bài báo trình bày kết quả so sánh và đánh giá khả năng hấp thu các chất ô nhiễm dinh dưỡng bằng hệ thực vật cỏ sậy (Phragmites australis L.) và vetiver (Vetiveria zizanioides L.). Kết quả nghiên cứu chỉ ra Tải trọng 1 đạt hiệu quả xử lý cao đối với các chất dinh dưỡng nitrogen và phosphor. Khi so sánh hiệu quả xử lý nitrogen và phosphor đã nhận thấy không có sự khác biệt có ý nghĩa thống kê giữa cỏ sậy và cỏ vetiver trong cùng tải trọng (P>0,05). Trong cùng tải trọng hiệu quả xử lý các chất dinh dưỡng của nghiệm thức trồng cây thường cao hơn đối chứng không trồng cây (P
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