In the preaeration process (diffused or mechanical), we aerate wastewater to achieve and maintain an aerobic state (to freshen septic wastes), to strip off hydrogen sulfide (to reduce odors and corrosion), to agitate solids (to release trapped gases and improve solids separation and settling), and to reduce BODs. All of this can be accomplished by aerating the wastewater for 10 to 30 minutes. To reduce BODs, preaeration must be conducted for 45 to 60 minutes.

12.5.1 Operational Considerations

In preaeration grit removal systems, the operator is concerned with maintaining proper operation and must be alert to any possible mechanical problems. In addition, the operator monitors dissolved oxygen levels and the impact of preaeration on influent.

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