Q5. (a) Describe the operation of a vacuum sewage system. (5)
(b) List the advantages of a vacuum sewage system when compared to a conventional flushing system. (4)
(c) State why untreated sewage should not be allowed to stagnate. (1)
Q4. Describe, with the aid of a sketch, a Membrane Bioreactor type sewage treatment plant. (10)
Q5. Describe, with the aid of a sketch, the operation of a biological sewage treatment plant (10)
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