The 'specific resistance to filtration' test measures the dewaterability of:
Choose the correct answer
Drinking water filterability
Ease of dewatering sludge — high specific resistance = hard to dewater (important for sludge treatment design)
Permeability of soil strata
Flow rate through rapid sand filter
Correct Answer
B. Ease of dewatering sludge — high specific resistance = hard to dewater (important for sludge treatment design)
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Specific resistance r (m/kg): measures how easily water can be squeezed out of sludge on a filter. Buchner funnel test: plot t/V vs V — slope gives r. Higher r → harder to dewater. Typical range: raw sludge r ≈ 10¹³ m/kg; after conditioning r ≈ 10¹¹ m/kg. Conditioning (polyelectrolyte, lime) improves dewaterability. Important for centrifuge/belt press design.
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