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ENVIROGEN ANNOUNCES SUCCESSFUL DEMONSTRATION OF BIOLOGICAL AIR POLLUTION CONTROL TECHNOLOGY

 LAWRENCEVILLE, N.J., June 16 /PRNewswire/ -- Envirogen, Inc. (NASDAQ: ENVG) today announced at the Air and Waste Management Conference in Denver the completion of a successful field demonstration of the company's biofiltration technology at a manufacturing site in the southeastern United States.
 The project clearly demonstrated consistently high styrene removal efficiencies from plant airborne effluents at low cost and with minimal operator attention. Styrene is to be a regulated air toxic under the Clean Air Act Amendments of 1990.
 To fully evaluate the benefits of biofiltration technology, support for the demonstration project was provided under a joint agreement with two manufacturing companies which have a strong interest in promoting the development and successful commercialization of economical means to reduce plant vapor effluents.
 Biofiltration technology employs biocatalysts in the form of naturally occurring microorganisms in a closed vessel to treat plant emissions. In the demonstration, styrene was destroyed with efficiencies greater than 95 percent as measured by continuous emissions monitoring equipment. Of particular interest to the three-membered project team was the positive response of the biofilter to rapid changes in contaminant concentrations, to discontinuous daily and weekly plant operation, and to extended periods of plant shutdown. Minute-to-minute fluctuations in influent concentration due to discontinuous spray booth operating conditions within the plant, had no effect on system effluent quality. Upon resumption of service after shutdown periods, the unit recovered to greater than 90 percent removal efficiencies within six hours. The unit was evaluated through extended runs during a total of four months of testing. The residence time for vapor treatment within the system was as low as 15 seconds, substantially lower than the 60 to 120 second residence times typically reported for biofilters treating organic wastes.
 In anticipation of commercializing biofiltration technology, Envirogen is collaborating with a major engineering firm to assist in engineering and process design scale-up. The anticipated full-scale systems would be sized to permit handling of very high flow rates, in the commercial range of 2,000 to 200,000 cubic feet of air flow per minute. Projected process economics indicate substantial annual savings vs. competitive thermal or carbon processes.
 Envirogen is an innovative environmental biotechnology company dedicated to the business of discovering, developing, and applying new and effective solutions to the task of degrading or transforming toxic and hazardous wastes. The company also designs and implements vapor extraction systems under the trade name VAPEX and other integrated systems for the on-site treatment of organic contaminants from soils and groundwater.
 /delval/
 -0- 6/16/93
 /CONTACT: Gale T. Smith, corporate communications of Envirogen, 609-936-9300/
 (ENVG)


CO: Envirogen, Inc. ST: New Jersey IN: ENV SU:

MK-MP -- PH006 -- 2496 06/16/93 09:20 EDT
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Publication:PR Newswire
Date:Jun 16, 1993
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