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In order for plastics recycling to be a viable alternative in the long term, the recycled resins must be competitive with virgin resins both in terms of economics and purity. Current processing technologies utilize either hand sorting or automated sorting on the bottle level. However, there are many sources of contamination other than whole bottles, which will remain in the stream using whole bot ...

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COAL TAR IS A BY-PRODUCT OF THE COAL GASIFICATION PROCESS USED WIDELY BETWEEN 1820 AND 1950 TO PRODUCE A NATURAL GAS SUBSTITUTE. DURING THAT TIME, BILLIONS OF GALLONS OF TAR WERE PRODUCED AT MORE THAN 1500 GAS MANUFACTURING FACILITIESLOCATED THROUGHOUT THE U.S. A LARGE PORTION OF THIS WASTE TAR REMAINS IN STORAGE OR WAS DISPOSED OF BY INJECTION INTO SUBSURFACE SITES. COAL TAR IS A MIXTURE OF HYDRO ...

Infrared tunable diode laser spectrometers provide a highly effective means of measuring trace concentrations, with either remote sensing or with advective sampling. It is often desirable to measure more than one trace gas at a time. This is especially true when gas emissions are strongly correlated, such as in combustion emissions where measuring both the CO2 concentration and another minor con ...

Laser-induced fluorescence (LIF) can sometimes be used as a diagnostic device in biology and medicine. In general, LIF has difficulties in relating the fluorescence spectra to the concentration of the emitters within the tissue, in identifying different species, and in the possibility of destroying the molecules being probed if the wrong excitation wavelength is chosen. Many of the problems asso ...

RECENT PROMISING DEVELOPMENTS IN THE PETROLEUM INDUSTRY "PROFILE MODIFICATION TECHNOLOGY" (PMT) WILL BE EVALUATED FOR THEIR APPLICATION TO LEAKING LANDFILL SITES. PROFILE FLOW MODIFICATION TREATMENTS ARE USED TO INCREASE FLOW RESISTANCE IN HIGH PERMEABILITY AREAS FAR (75 FEET TO AS MUCH AS 1000 FEET) FROM THE INJECTION WELLBORE. THESE TREATMENTS CAN WITHSTAND FORMATION PRESSURES AND TEMPERATURES U ...

STUDIES INDICATE THAT STRAIGHT SEPTAGE INTRODUCTION TO ACT IVATED SLUDGE PLANTS CAUSES SHOCK LOADING AND SUBSEQUENT VIOLATION OF EFFLUENT PERMIT STANDARDS. THIS PROJECT INTENDS TO EVALUATE DEWATERING OF SLUDGE BY THEUSE OF WIRE CLOTH SCREENING TO DETERMINE IF THE DEWATERED SLUDGE MEETS LANDFILL ACCEPTABILITY STANDARDS. IT INTENDS A ALSO TO DETERMINE IF THE RETURN OF THE FILTRATE TO THE S SEPTIC TA ...

RECENT ASSESSMENTS ESTIMATE U.S. CROP LOSSES FROM ELEVATED OZONE LEVEL AND OTHER OXIDANTS (SULFUR DIOXIDE, NITROGEN DIOXIDE) TO BE AS MUCH AS $5 BILLION ANNUALLY. ADDITIONALLY,SEVERE FOREST DAMAGE MAY RESULT FROMPOLLUTION-RELATED OXI- DANTS PARTICULARLY IN EUROPE WHERE THERE HAS BEEN A DRAMATICDECLINE IN FOREST ECOSYSTEMS OVER THE PAST SIX YEARS. THIS RESEARCH IS DIRECTED AT THE MITIGATION OF SUCH ...

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USE OF PULSED ULTRAVIOLET RADIATION IS PROPOSED AS A MEANS TTO DETOXIFY EQUIPMENT USED IN THE PREPARATION OF TOXIC CH CHEMICAL COMPOUNDS. THE RADIATION WILL SERVE TO BOTH V VAPORIZE MATERIAL ADHERING TO THE SURFACE AS WELL AS TO BRING ABOUT PHOTOLYTIC DESTRUCTION. THIS COMBINATION OF EFFEFFECT IS PROJECTED TO PROVIDE A DRY CLEANING CONCEPT WHERE THE TOXIC MATERIAL AND ITS BYPRODUCTS (POTENTIALLY T ...