Q4. With reference to MARPOL Annex IV; A. Draw a biological sewage treatment plant and explain the principle of operation B. Periodical maintenance and checks and tests required to be done to verify the effectiveness of the above system.
Q6. A. Describe a vacuum sewage system;
B. With reference to the system described in (A) - i. State ONE advantage of the system;
ii. State why a holding tank may be required to be fitted to the system;
iii. State the problems resulting from the retention of untreated sewage in a holding tank.
Q6. a) With reference to shipboard sewage systems, describe the principle of operation of EACH of the following types: (10)
I. Flow through system;
II. Collection / Holding / transfer system;
III. Zero discharge system.
b) Explain why sewage systems involving aerobic action are to be preferred to those with anaerobic action. (10)
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