Q2 (16 Marks)
General
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Repeated 6x in exams
MEP • Written Exam
A biological sewage system develops a fault, which necessitates opening the unit for repair:
(a) The risk associated with opening he unit. (6)
(b) The precaution taken to reduce the risk. (6)
(c) Explain the significance of biological oxygen demand (B.O.D.). (4)
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