Besides promoting mixing of the bacterial population with the fecal waste material, what is the purpose of aeration system as used in a biological sewage treatment plant?
• Difference between aerobic and anaerobic bacteria in sewage treatment • Role of oxygen in biological waste metabolism • Effect of bubbling air on whether solids tend to settle or stay suspended
• In an aeration tank, do we want bacteria that use oxygen or bacteria that live without oxygen? Think about which type ‘aeration’ supports. • If you are constantly bubbling air through a tank, will that motion make particles settle to the bottom more, or keep them stirred up and off the bottom? • Which combination of bacteria type (aerobic/anaerobic) and settling behavior (settle/prevent settling) best matches what an aeration chamber is trying to achieve?
• Confirm whether aeration means adding oxygen or removing oxygen from the system. • Decide if aerobic bacteria require oxygen or no oxygen for metabolism. • Decide whether the design goal in an aeration chamber is to keep solids suspended for contact with bacteria, or to let them settle there (hint: where does most settling normally happen in a treatment plant?).
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