Prediction of full scale plant performance from pilot columns.

The first attempt to provide a data base for comparing a pilot and full scale system for various organics produced results that require further investigation. Although both of the pilot systems had longer average contact times than their respective full scale systems, a uniform pattern of longer service time for the different substances evaluated did not occur. These results may not be consistent with the data collected using pilot contactors in series to observe the effect of contact time. The series pilot contactor system provided data that show the effect of varying empty bed contact time on the removal of the organic substances studied. Improved effluent quality was generally achieved with increased contact time. A pilot series system similar to the one used is considered essential in collecting and interpreting design data. A method of statistical interpretation of the results was developed that shows promise for use in evaluating pilot column results. Further evaluation is required to assess that all pertinent factors were properly controlled during the investigation. Also, repeat testing will be conducted, attempting to control more closely the contact times between the pilot and full scale systems. The comparative granular activated carbon particle sizes also will be more closely examined. Although pilot to full-scale comparisons have been successfully performed for single parameters, the results for multiple organics have not been previously reported. Such a data base, if properly collected, will provide invaluable background in assessing what types of design safety factors are required when using pilot column data to predict full scale results for a naturally occurring mixture of organic substances.