QUESTION 2 [10 Marks] Three students Students' A, B and C) at a university are instructed to collect samples from a rive

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Question 2 10 Marks Three Students Students A B And C At A University Are Instructed To Collect Samples From A Rive 1 (58.32 KiB) Viewed 72 times

QUESTION 2 [10 Marks] Three students Students' A, B and C) at a university are instructed to collect samples from a river stream at a location where a winery factory generates organic waste nearby. The samples must be taken to a laboratory, placed in a standard 300ml BOD bottle and diluted with organic-free oxygen saturated water (300ml). Thereafter, the students have to determine the initial dissolved oxygen, and then place the sealed bottles into an incubator for 5 days at 20°C. After 5 days, the dissolved oxygen, and subsequent 5-day BOD, can be determined. Three students decide to work together and tabulate their results as follows (Table 2). Calculate the missing values ((a) to (i)). (10) Table 1 Student Wastewater Dilution volume (ml) Factor DO initial (mg/1) DO after 5 days (mg/l) Oxygen consumed BOD5 (mg/1) (mg/1) А 10 (a) 8.92 (d) (g) 169 A B C B 15 (b) 8.9 (e) (h) 154 C 20 (c) 8.77 (i) 123