Sewerage waste was discharged into Mulungushi River from Iris lodge which is located along the banks of the river as they had a problem with a septic tank since it was full. This problem normally occurs in the rain season and this resulted in a mixture having DO of about 9mg/L. The average occupancy rate monthly is about 70%. The septic tanks are emptied after every two weeks. After 5 days, DO dropped to 3mg/L when ZEMA carried out the analysis of the water sample in the river. The reaction constant rate k was found to be 0.22 day ^(-1) and the oxygen consumed in the first five days was 200mg/L. a) How do suspended solids and chemicals affect the surrounding environment? Give two examples. b) What would be the ultimate carbonaceous BOD? c) What will be the remaining oxygen demand after 5 days? d) What advise can you give to the to the lodge owner as a Civil Engineer?
Sewerage waste was discharged into Mulungushi River from Iris lodge which is located along the banks of the river as they had a problem with a septic tank since it was full. This problem normally occurs in the rain season and this resulted in a mixture having DO of about 9mg/L. The average occupancy rate monthly is about 70%. The septic tanks are emptied after every two weeks. After 5 days, DO dropped to 3mg/L when ZEMA carried out the analysis of the water sample in the river. The reaction constant rate k was found to be 0.22 day ^(-1) and the oxygen consumed in the first five days was 200mg/L. a) How do suspended solids and chemicals affect the surrounding environment? Give two examples. b) What would be the ultimate carbonaceous BOD? c) What will be the remaining oxygen demand after 5 days? d) What advise can you give to the to the lodge owner as a Civil Engineer?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Sewerage waste was discharged into Mulungushi River from Iris lodge which is located along the banks of the river as they had a problem with a septic tank since it was full. This problem normally occurs in the rain season and this resulted in a mixture having DO of about 9mg/L. The average occupancy rate monthly is about 70%. The septic tanks are emptied after every two weeks. After 5 days, DO dropped to 3mg/L when ZEMA carried out the analysis of the water sample in the river. The reaction constant rate k was found to be 0.22 day ^(-1) and the oxygen consumed in the first five days was 200mg/L.
a) How do suspended solids and chemicals affect the surrounding environment? Give two examples.
b) What would be the ultimate carbonaceous BOD?
c) What will be the remaining oxygen demand after 5 days?
d) What advise can you give to the to the lodge owner as a Civil Engineer?
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