A factory is discharging its wastewater into a slowly moving stream that has a mean velocity of 3 cm/s. The flow rate of the stream is 4 times as that of the wastewater. The ultimate BOD of stream and wastewater are 5 mg/L and 105 mg/L, respectively. And DO of the stream and wastewater are 6 mg/L and 1 mg/L, respectively. The temperatures of the stream and wastewater are 15oC. The deoxygenation rate at 15oC is 0.48 day-1, and the re-aeration rate at 15oC is 0.72 day-1. Draw a DO sag curve to show your clients using Microsoft Excel. Please insert your DO sag curve into your project report (30 points); Based on your DO sag curve, find the location of and travel time to the critical point, and determine the minimum D A type of local fish requires the minimum DO in the river above 2 mg/L. Please evaluate whether the actual minimum DO is acceptable. If not, please qualitatively and quantitatively select appropriate management strategies to allow water quality to reach the quality requirements. And determine the location of and travel time to the new critical point, and the new minimum DO. Please insert your new DO sag curve into your project report
A factory is discharging its wastewater into a slowly moving stream that has a mean velocity of 3 cm/s. The flow rate of the stream is 4 times as that of the wastewater. The ultimate BOD of stream and wastewater are 5 mg/L and 105 mg/L, respectively. And DO of the stream and wastewater are 6 mg/L and 1 mg/L, respectively. The temperatures of the stream and wastewater are 15oC. The deoxygenation rate at 15oC is 0.48 day-1, and the re-aeration rate at 15oC is 0.72 day-1.
- Draw a DO sag curve to show your clients using Microsoft Excel. Please insert your DO sag curve into your project report (30 points);
- Based on your DO sag curve, find the location of and travel time to the critical point, and determine the minimum D
A type of local fish requires the minimum DO in the river above 2 mg/L. Please evaluate whether the actual minimum DO is acceptable. If not, please qualitatively and quantitatively select appropriate management strategies to allow water quality to reach the quality requirements. And determine the location of and travel time to the new critical point, and the new minimum DO. Please insert your new DO sag curve into your project report
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