Which of the following puts the secondary treatment of wastewater in the correct order?
Bacteria settle in clarifier; aeration tank is churned and bacteria eat - water is flowed into the tank and air is pumped into it.
Bacteria multiply and eat waste in settler - water is circulated and air is added to the system; bacteria then are added to the aeration tanks.
Bacteria seeded in aeration tank as air is circulated throughout the water - bacteria multiply and eat waste; bacteria settle in clarifier.
Clarifier is added to the aeration tanks; bacteria thrive and eat waste - air is added to the end to mix the sludge.
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