With reference to biological sewage systems: (a) Describe the principle of operation of a biological sewage treatment plant; (4) (b) State TWO operational factors that may adversely affect the operation of the plant and how the effects would be indicated; (2) (c) Explain why, on a long sea passage, it is inadvisable to bypass the unit. (2) (d) Explain the meaning and significance of the term biological oxygen demand. (2)
Sewage system
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