Abstract |
The Public Health Service initiated a project to evaluate the experience of the States with 'extended aeration' plants and to collect and review available data and performance records. The study was limited to plants of 20 to 2,500 population equivalent utilizing the extended-aeration process. Laboratory data from 59 of the 1,224 plants form the basis of the performance evaluation. Extended-aeration plants with proper design, maintenance, and operation can effect high BOD reductions. Records show a wide range of efficiencies with an average of 86 percent BOD removal. Suspended solids removal is less, averaging 62 percent and ranging from 0 to 96.5 percent. |