During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?
Correct answer: D. At the end of filtration
- A. At time zero
- B. At the end of filtration, but decreases with time subsequently
- C. When half the filtrate has been obtained
- D. At the end of filtration
Explanation
At the start of washing, the cake has the maximum thickness reached during filtration, so its resistance and the washing rate correspond to the filtration rate at the end of filtration. With continued washing, the cake resistance is essentially unchanged, but the key comparison is the terminal filtration rate.
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