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Groundwater Remediation with Organoclay

Groundwater Remediation Case Study

This study, conducted during late 1999, investigated the feasibility of using ET-1 for groundwater remediation. Phase one of the study consisted of an adsorption column test to validate the ability of the organoclay to remediate TPH and BTEX from groundwater. A glass column of one inch diameter and twelve inches long was filled with the organoclay medium. A known concentration of hydrocarbon was passed through the column at 2.0 milliliters per minute, resulting in a 20 minute contact time. All effluent was collected in 40 ml vials for analysis. Nine effluent samples were collected during the test and the results are presented in table 1. Six of the samples showed no detectable TPH or BTEX in the effluent. The laboratory did not attempt to explain the anomalous results for samples 1, 5 and 9.

Phase two of the study involved the field testing of organoclay at groundwater remediation sites. The second phase ended prematurely for administrative reasons, but not before useful information was obtained. Table 2 presents the effect of organoclay on BTEX constituents at one of the test sites. Water at this site was passed in downflow through two drums of organoclay medium at an average rate of 4.8 gallons per minute. As the table indicates, samples were obtained at the influent and after each drum of organoclay, except for the first sampling event.