Which of the following measure could not improve the settling efficiency in sedimentation tank？ （ ）。
A: To increase the surface area of the tank
B: To increase the flow rate
C: To improve the performance of flocculation before sedimentation
D: To recycle the sludge to improve the size of particles
A: To increase the surface area of the tank
B: To increase the flow rate
C: To improve the performance of flocculation before sedimentation
D: To recycle the sludge to improve the size of particles
举一反三
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