Double filtration systems are implemented for_______________?
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Answer: A. to increase the filtration slow sand filters capacity of
Explanation
Double filtration systems are implemented to increase the filtration capacity and efficiency of slow sand filters. Passing water through two successive filter stages allows higher raw water turbidities to be treated safely. This arrangement enhances overall pathogen removal and extends operational run times between cleanings. Slow sand filters traditionally struggle with high turbidity water because their fine media clogs rapidly. A primary roughing filter or dual-stage setup removes bulk suspended solids before final biological polishing. Engineering optimizations like double filtration improve the economic viability of slow sand plants.
Municipalities with variable raw water quality adopt advanced filtration configurations to meet drinking standards. Upgrading existing water treatment plants with double filtration increases output without expanding land area. Reliable water purification protects public health in communities relying on surface water reservoirs. Increasing rapid sand filter capacity is incorrect because rapid filters use different backwash mechanisms. Isolated swimming pool applications use specialized high-rate pressure filters rather than double slow sand systems. All of the above is incorrect because the technique specifically targets slow sand filter capacity enhancement.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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