Graduate Thesis Or Dissertation
 

The effect of elevated pressure on the activated sludge process

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  • A study of the effect of elevated pressure on the activated sludge waste treatment process is presented. The method of study involved a comparison of two laboratory, batch type, activated sludge units. One unit was operated at atmospheric pressure as a base control and the other operated at elevated pressures up to 60 psig. All other controllable parameters were kept constant. The units were compared on the basis of: 1. The type of biological growth present in the mixed liquor, 2. The mass growth rates of the biological organisms. 3. The removals of chemical oxidation demand. 4. The dissolved oxygen concentration in the mixed liquor. 5. The pH of the mixed liquor. Results of this study showed that: 1. Elevated pressure of 60 psig does not affect the type of biological growth present in the mixed liquor, but it does hinder the formation of long-chain filamentous growths. 2. The sampling methods used for determining the growth rates were not adequate and provided no basis for comparison. 3. Under the conditions of this study, elevated pressures have no effect on the removal of chemical oxygen demand in the activated sludge process. 4. The dissolved oxygen concentration in the mixed liquor increases with the pressure, but, under the conditions of this study, not in a direct relationship. 5. Elevated pressure of 60 psig does not adversely affect the pH of the mixed liquor. This study is one phase of an investigation to determine the feasibility of increasing the reaction rates of the activated sludge process by subjecting the process to both high pressure and high shear mixing.
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