Document Z4XDdo56RyeX9Qn74KzjrpqrJ

ir Industriat llygiror Puml 289 New Advances in y*ly-Ah ConlfoK H. D, Alford, Comltuttion Jt 45*49 (July I960), Tho rvor increasing demand for cleaner stacks, to meet anti-air pollution regula tion*, has resulted in improved boiler end fly ash collector design. Resistivity of the ash particles is one of the major factors which determines the ease of electrostatic collection. Particles of over 10 microns are easily removed by mechanical cyclonic collectors hut electrostatic collectors are required to remove particles of smaller site. New precipitator design provides maximum olectrical stability, minimum dust erosion, maximum thermal stability'and better gas distribution qualities. Recent improvements on "Rapper" controls, power controls and mechanical power controls provide an impotus of major significance In the constant advances In fly ash collection. - - Public Health Eng, Absis, i. 293 290 Garage Health Hazards and Ventilation. C R. Ross nnd 1*. Rispler. Occ Health Rev, (Ottawa) 11T *^*6 (I960), * Carbon monoxide exists in gasoline engine exhaust gases in concentrations ranging from over 10% at idlo speed to about 3% at full apeud. The amount of carbon monoxide in the .exhaust of diesel engines is less than in gasoline engine*. Local exhaust systems remove sir contaminants at their points of origin before they can escape into the general atmosphere. These systems should be considered because they obtain positive control of contaminants with a minimum amount of air. An exhaust system consists of hoods or enclosures at the aources of air contamination, bronch and main ducts through which an air stream transporta the contaminant outdoors, a fan to produce the required air flow, and in some cases en air cleaner. APCA Absts. '-."t,' ^ wv 7 ' * 294 291 Activated Carbon Filters Control Radioactive Vapors. T. T. Porembtki. Air Cond, Heat, and Vent. 57. 97-9b (Nov. 1960). '1 A newly designed activated carbon and stack system to handle radioactive iodine vapor is operated in conjunction with existing air cleaning facilities at the Radioactive Ma terials Laboratory, The new facility will permit immediate sectioning and chemical and cor rosion testing of irradiated samples which otherwise could not be handled until the- samples had sufficiently decayed and are safe to handle. Proper operation of the ventilation aystem depends upon the following factors; (1) Assurance that all isolation boxes are seated, (2) Proper equipment operation. (3) Proper air balancing, (4) Assurance that the (eolation boxes are under negative pressure. The activated carbon filters, 95% efficient, used 2 in a aeries, provide a concentration reduction of 4 x 10*. The system has been found very satis factory for the Containment of radioactive effluents. - - APCA Absts, COMMUNITY AIR HYGIENE M -( 292 Evaporated^ Meta) Dims t Indicators of Atmospheric Pollution. J. P. Lodge, Jr, and Bernice "r, Havfik. Intern, J, Air Poll. 249-252 (Oct. I960), As a substitute is proposed for present technique# of measuring atmospheric corrosivsnsts, namely the use of evaporated metsl films a few hundredths of a micron In thick *1 v;t ness, Class slides coversd with films of aluminum, iron, lead, copper and silver were pre pared and exposed in the Cincinnati area. Corrosion products were identified by means of x-ray diffraction and microchemical methods. Corrosion results in en increase in light tram- mission by the film, which can be taken e a quantitative measure of corrosion. Preliminary result# showed aluminum to bo the most dependable Indicator of general atmospheric eorrosU*' nets, although silver appeared specifically sensitive to email group of pollutants, such as r .1 .*1 \l' I *\ *{V 4 4 295 * t iI