Exam Question
(i) Sketch and describe a biological sewage treatment system. (6)
(ii) How does the biological Sewage Treatment Plant work? Explain. (6)
(iii) What is understood by the term BOD? What factors affect BOD (4)
Class 4 (4th Engineer)
MEKG
📅 Apr 2023
Reference Answer
### (i) Description of a Biological Sewage Treatment System
A biological sewage treatment system, specifically the extended aeration type commonly found on ships, is a multi-stage unit designed to treat raw sewage using aerobic bacteria to produce a safe, clean effluent suitable for discharge overboard in compliance with MARPOL Annex IV regulations.
The system is typically composed of four main compartments or chambers, arranged sequentially:
1. **Primary / Comminuting Chamber:**
A biological sewage treatment system, specifically the extended aeration type commonly found on ships, is a multi-stage unit designed to treat raw sewage using aerobic bacteria to produce a safe, clean effluent suitable for discharge overboard in compliance with MARPOL Annex IV regulations.
The system is typically composed of four main compartments or chambers, arranged sequentially:
1. **Primary / Comminuting Chamber:**
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