Permeable barriers to remove benzene: candidate media evaluation

Article Abstract:

A candidate barrier comprised of sand/powdered activated carbon (PAC) mixture is suggested for the in situ removal of benzene from a groundwater stream. The barrier is touted to be cost-effective as well as easy to install and operate. However, pilot and full-scale studies are necessary to prove the efficacy of the system. For one, there is a discrepancy between the estimated and observed breakthrough time, since predictions on breakthrough time for the PAC/sand column from Freundlich constants were based on a sketchy and approximate analysis.

Research, Bioremediation, Activated carbon, Sand, Sands, Carbon, Activated, Saline water barriers

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Modeling coliform mortality in waste stabilization ponds

Article Abstract:

A coliform mortality rate regression model has been developed to allow the computation of coliform reduction based on pond depth, pH variation and solar intensity. Agreement between the predicted and observed values of the bacterial mortality rate constant was studied by making several assumptions. These assumptions resulted in some discrepancies as the obtained regression equation was used for variables that are not applicable to the model. The good agreement obtained between the observed and predicted values is, therefore, questionable.

Analysis, Bacteria, Sewage, Sewage microbiology, Regression analysis, Settling basins

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Operational strategy for metal bioleaching based on pH measurements

Article Abstract:

Neural networks are recommended for modeling metal bioleaching in batch reactors based on pH measurements, both for temporal variation of pH and the determination of final metal concentration. Neural networks for the entire modeling phase may provide a more accurate representation of the temporal variation of the pH and soluble metal concentration. The extended Kalman filter used in the study requires extensive computation and determination of numerous model parameters.

Computer networks, Neural networks, Bacterial leaching, Bioleaching

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