Numerical and physical modeling of air diffuser plume

Article Abstract:

A theoretical framework for describing change in phase fractions, water velocity and plume width of the diffuser airflow velocity is presented. The model is bounded by a wall on one side and used a drift-flux theory for multiple bubble and slug interactions to simulate very high air fractions. It is intended for use in aeration tanks with depths of less than 10 meters. Results show that the model tends to overestimate the velocities compared with the measured data.

Water, Plumes (Fluid dynamics), Water aeration, Diffusers

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Modeling of energy spilling in substrate-sufficient cultures

Article Abstract:

An assessment is made on the ability of bacteria to spill energy when growing under conditions that are substrate sufficient, in the organic breakdown of sludge in wastewater processing. Examples are presented for both conventional activated sludge systems and recycling sludge between aeration, settling and anoxic tanks.

Denmark, Netherlands, Hong Kong, Bacterial growth, Sewage, Sewage microbiology, Bioreactors, Bacteriology, Sewage sludge digestion, Bacterial cultures, Sanitary microbiology

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Modeling fate of pathogenic organisms in coastal waters of Oahu, Hawaii

Article Abstract:

A discussion is presented on the relevance of water level and currents when using a hydrodynamic model to depict pathogenic organisms in bodies of water, focusing on Mamala Bay, Oahu, as an example.

Hawaii, Statistical Data Included, Environmental aspects, Water pollution, Pathogenic microorganisms, Hydrodynamics, Coastal ecology, Ocean currents, Oahu

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