Abstract
In a Sequencing Batch Reactor (SBR) the substrate concentration is intended to increase during the fill phase to allow the heterotrophic bacteria to periodically enjoy maximum growth conditions. When growing at a maximum rate, however, the bacteria do also respire at a maximum rate, and it can be a problem, technically, to satisfy the oxygen demand thus generated. Use of conventional aeration systems to meet peak oxygen demands has proven unsatisfactory in some cases because of foam accumulation and volatilization of noxious substances.To satisfy the peak oxygen demand a membrane oxygenation system was developed and tested under field conditions. Silicone tubing was submerged in a Sequencing Batch Reactor, and loaded with pure oxygen whenever necessary. As demonstrated, oxygen penetrates through the wall of the tubing and contributes to a rapid increase of the oxygen concentration in the reactor. Long term experiments were conducted to study the applicability of this technique. Results are promising.
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