Consider a stream containing 8Y mg 1-¹ of ammonia-N and 100X mg 1-¹ of sucrose discharge at a rate of 2 m³ s-¹ to a rive

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Consider A Stream Containing 8y Mg 1 Of Ammonia N And 100x Mg 1 Of Sucrose Discharge At A Rate Of 2 M S To A Rive 1 (76.67 KiB) Viewed 43 times

Consider a stream containing 8Y mg 1-¹ of ammonia-N and 100X mg 1-¹ of sucrose discharge at a rate of 2 m³ s-¹ to a river with a background BOD of 5 mg l-¹. a) What is the stream's ThOD? (5) b) How long it will take to degrade 85% of the CBOD and 96% of NBOD? (4) c) Assuming the nitrogen starts to be degraded 10 days after the carbon, plot the exerted BOD for 40 days. What are your main conclusions from the plot? (5) d) What is the ultimate BOD of the river at the point of discharge? (2) e) A BOD5 test based on the dissolved oxygen is performed to a sample from the point of discharge. What is the maximum sample volume could be used for a 400ml test bottle? Justify your answer. (4) Data: KL=0.1Z day-¹ KN=0.30 day-1 Q(river) = 15 m³ s-1 CBODU = 90% carbonaceous ThOD