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Microbial Waste Water Treatment
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Activated sludge should have the ability to settle quickly so that it can:
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A
be rapidly pumped back from sedimentation tank to aeration tank
💡 Explanation:
The activated sludge have to settle quickly so that it can be pumped back to the aeration tank. So, the correct option is 'be rapidly pumped back from sedimentation tank to aeration tank'