Exam Question
(a) Sketch and describe a biological sewage treatment system. (6)
(b) How does the biological Sewage Treatment Plant work?Explain. (6)
(c) What is understood by the term BOD? What factors affect BOD (4)
Class 4 (4th Engineer)
MEKG
📅 Sep 2023
Reference Answer
### (a) Sketch and Description of a Biological Sewage Treatment System
A biological sewage treatment plant (STP) is a marine pollution prevention system designed to treat raw sewage generated onboard ships to a standard that complies with MARPOL Annex IV regulations for overboard discharge. The fundamental principle is the use of aerobic bacteria to accelerate the natural process of decomposition of organic waste.
**System Description:**
A typical marine biological STP is a packaged unit comprising several interconnected chambers, designed to process sewage through distinct stages:
A biological sewage treatment plant (STP) is a marine pollution prevention system designed to treat raw sewage generated onboard ships to a standard that complies with MARPOL Annex IV regulations for overboard discharge. The fundamental principle is the use of aerobic bacteria to accelerate the natural process of decomposition of organic waste.
**System Description:**
A typical marine biological STP is a packaged unit comprising several interconnected chambers, designed to process sewage through distinct stages:
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