| Autor: |
Pagilla, Krishna R., Jenkins, David, Kido, Wendell H. |
| Zdroj: |
Water Environment Research; March 1996, Vol. 68 Issue: 2 p235-239, 5p |
| Abstrakt: |
Laboratory- and full-scale experiments investigated the use of a classifying selector for Nocardiacontrol in activated sludge. A classifying selector is a device that produces surface foam from the bulk mixed liquor and then removes it. The laboratory-scale classifying selector activated sludge system operating at a 10-day mean cell residence time (MCRT), pH = 6.6, dissolved oxygen (DO) = 8.0 mg/L, and temperature = 24°C produced mixed liquor Nocardialevels lower than an unfoamed control activated sludge plant. Addition of low doses (0.5 mg/L) of a readily biodegradable nonionic surfactant (NEODOL 25–7) to the classifying selector system just before foaming reduced the mixed liquor Nocardialevels to below those achieved in a classifying selector system without surfactant addition. A classifying selector installed in the RAS channel combined with selective foam wasting from the mixed liquor channels and secondary clarifiers in a full-scale activated sludge plant reduced Nocardialevels below those achieved during operation without a classifying selector. |
| Databáze: |
Supplemental Index |
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