The Siak is a typical, nutrient-poor, well-mixed, black water river in central Sumatra, Indonesia, which owes its brown color to dissolved organic matter (DOM) leached from surrounding, heavily disturbed peat soils. We measured dissolved organic carbon (DOC) and oxygen concentrations along the river, carried out a 36-h experiment in the province capital Pekanbaru and quantified organic matter and nutrient inputs from urban wastewater channels into the Siak. In order to consider the complex dynamic of oxygen in rivers, a box-diffusion model was used to interpret the measured data. The results suggest that the decomposition of soil derived DOM was the main factor influencing the oxygen concentration in the Siak which varied between ∼100 and 140 μmol l−1. Additional DOM input caused by wastewater discharges appeared to reduce the oxygen concentrations by ∼20 μmol l−1 during the peak-time in household water use in the early morning and in the early evening. Associated enhanced nutrient inputs appear to reduce the impact of the anthropogenic DOM by favoring the photosynthetic production of oxygen in the morning. A reduction of 20 μmol l−1, which although perhaps not of great significance in Pekanbaru, has strong implications for wastewater management in the fast developing areas downstream Pekanbaru where oxygen concentrations rarely exceed 20 μmol l−1.
Rixen T., Baum A., Sepryani H., Pohlmann T., Jose C. and Samiaji J. (2010) Dissolved oxygen and its response to eutrophication in a tropical black water river. 91(8): 1730-1737. 10.1016/j.jenvman.2010.03.009
@article{Rixen2010,
Title = {Dissolved oxygen and its response to eutrophication in a tropical black water river},
Author = {Rixen, Tim and Baum, Antje and Sepryani, Harni and Pohlmann, Thomas and Jose, Christine and Samiaji, Joko},
Editor = {},
Year = {2010},
Pages = {1730-1737},
Volume = {91},
Doi = {10.1016/j.jenvman.2010.03.009},
Abstract = {The Siak is a typical, nutrient-poor, well-mixed, black water river in central Sumatra, Indonesia, which owes its brown color to dissolved organic matter (DOM) leached from surrounding, heavily disturbed peat soils. We measured dissolved organic carbon (DOC) and oxygen concentrations along the river, carried out a 36-h experiment in the province capital Pekanbaru and quantified organic matter and nutrient inputs from urban wastewater channels into the Siak. In order to consider the complex dynamic of oxygen in rivers, a box-diffusion model was used to interpret the measured data. The results suggest that the decomposition of soil derived DOM was the main factor influencing the oxygen concentration in the Siak which varied between ∼100 and 140 μmol l−1. Additional DOM input caused by wastewater discharges appeared to reduce the oxygen concentrations by ∼20 μmol l−1 during the peak-time in household water use in the early morning and in the early evening. Associated enhanced nutrient inputs appear to reduce the impact of the anthropogenic DOM by favoring the photosynthetic production of oxygen in the morning. A reduction of 20 μmol l−1, which although perhaps not of great significance in Pekanbaru, has strong implications for wastewater management in the fast developing areas downstream Pekanbaru where oxygen concentrations rarely exceed 20 μmol l−1.},
}
TY - JOUR
AU - Rixen, Tim
AU - Baum, Antje
AU - Sepryani, Harni
AU - Pohlmann, Thomas
AU - Jose, Christine
AU - Samiaji, Joko
TI - Dissolved oxygen and its response to eutrophication in a tropical black water river
PY - 2010
SP - 1730-1737
VL - 91
DO - 10.1016/j.jenvman.2010.03.009
AB - The Siak is a typical, nutrient-poor, well-mixed, black water river in central Sumatra, Indonesia, which owes its brown color to dissolved organic matter (DOM) leached from surrounding, heavily disturbed peat soils. We measured dissolved organic carbon (DOC) and oxygen concentrations along the river, carried out a 36-h experiment in the province capital Pekanbaru and quantified organic matter and nutrient inputs from urban wastewater channels into the Siak. In order to consider the complex dynamic of oxygen in rivers, a box-diffusion model was used to interpret the measured data. The results suggest that the decomposition of soil derived DOM was the main factor influencing the oxygen concentration in the Siak which varied between ∼100 and 140 μmol l−1. Additional DOM input caused by wastewater discharges appeared to reduce the oxygen concentrations by ∼20 μmol l−1 during the peak-time in household water use in the early morning and in the early evening. Associated enhanced nutrient inputs appear to reduce the impact of the anthropogenic DOM by favoring the photosynthetic production of oxygen in the morning. A reduction of 20 μmol l−1, which although perhaps not of great significance in Pekanbaru, has strong implications for wastewater management in the fast developing areas downstream Pekanbaru where oxygen concentrations rarely exceed 20 μmol l−1.
ER -
