In order for a wastewater treatment unit to operate efficiently, the loading, both hydraulic and quality should be uniform. An example of this hydraulic loading is the flow rate into a basin, and an example of quality is the BOD in the inflow; however, this kind of condition is impossible to attain under natural conditions. For example, refer to Figure 3.9. The flow varies from a low of 18 m3/h to a high of 62 m3/h, and the BOD varies from a low of 27 mg/L to a high of 227 mg/L. To ameliorate the
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