VPH-0103
QUESTION
Sewage with BOD 500 mg/L is categorized as?
OPTIONS
(A) Weak
(B) Medium
(C) Strong
(D) Very strong
ANSWER
(D) Very strong
EXPLANATION
Sewage containing a BOD of about 500 mg/L is categorized as very strong sewage, because such a high biochemical oxygen demand indicates a very large load of biodegradable organic matter. Weak, medium, and strong sewage have progressively lower BOD values, whereas a BOD around 500 mg/L falls in the very strong category in the classification used for this examination. Therefore, option D, Very strong, is correct.
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Veterinary Public Health and Epidemiology · 121 Questions
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