Feasibility Testing of Biofiltration Technology for Remediating Air Contaminated by a Boat Manufacturing Facility.

This research investigated and compared the use of both bench- and pilot-scale biofilters to determine the effectiveness of controlling styrene, methyl ethyl ketone (MEK), and acetone emissions from an industrial gas waste stream. Critical operating parameters, including contaminant loading rate, temperature, and empty bed contact time, were manipulated in both the laboratory and field. At steady-state conditions, the bench and pilot-scale biofilters showed a 99% removal efficiency for styrene when the contaminant loading rate was less than 50 g m-3hr-1 and 40 g m-3hr-1, respectively. Although few data points were collected in the pilot-scale reactor where the styrene load was greater than 40 g m-3hr-1, the total organic contaminant load including both MEK and acetone typically ranged between 50 g m-3hr-1 and 80 g m-3hr-1. Greater than 99% removal efficiencies were observed for acetone and MEK in the pilot-scale biofilter at all evaluated loading rates. Also studied were biofilter acclimation and re-acclimation periods. In inoculated bench and pilot biofilter systems, microbial acclimation to styrene was achieved in less than five days. In comparison, no MEK degrading microbial inoculum was added, so during the first months of pilot-scale biofilter operation, MEK removal efficiencies lagged behind those noted with styrene.

The prevalence of antisocial behavior among U.S. Army DWI offenders.

This study compares arrest records for three groups of male soldiers. The first group of 76 had been arrested for DWI, completed a 5-day, in-patient evaluation/education program and were subsequently re-arrested, all within the period from January 1985 through December 1987. The second group of 76 was composed of a random sample, matched by age and ethnicity who had completed the 5-day program following a DWI but had not been re-arrested. The third group was a control group of 76, matched by age and ethnicity, but with no record of DWI, who were randomly selected from the same military units as the initial two groups. Soldiers with one DWI had significantly more arrests than did soldiers in the control group; soldiers with two DWI arrests had significantly more arrests than either of the other groups. The data indicate that soldiers apprehended for DWI are more likely than non-arrestees to be arrested for a wide variety of antisocial behaviors.