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Untreated domestic sewage has a low:

1. BOD value
2. \% of dissolved \( 0_{2} \)
3. amount of dissolved salts
4. value of suspended organic matter

Correct answer: BOD value

Solution

Untreated domestic sewage contains a large amount of biodegradable organic matter, so microorganisms consume more oxygen while breaking it down. That means its BOD is high, not low; the dissolved oxygen percentage is the one that tends to be low.

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