Activated sludge should have the ability to settle quickly so that it can
| 1. | be rapidly pumped back from the sedimentation tank to the aeration tank |
| 2. | absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank |
| 3. | be discarded and anaerobically digested |
| 4. | absorb colloidal organic matter |
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