ENCYCLOPEDIA OF ENVIRONMENTAL SCIENCE AND ENGINEERING - VAPOR AND GASEOUS POLLUTANT FUNDAMENTALS pps

... adsorption and electron-beam radiation. The selective catalytic reduc- tion of NO x to nitrogen and water by injection of ammonia in the presence of a catalyst has been developed and com- mercialized ... form N 2 and water. Wet Processes Wet processes fall into four catego- ries, absorption-reduction, oxidation-absorption-reduction, absorption-oxidation, and oxidation-abso...

Ngày tải lên: 10/08/2014, 20:20

... overview of the effects of air pollutants and their causes. From a practical standpoint, the most important factor in the control of indoor air pollution is the quality of the ven- tilation of occupied ... (schematic) as function of time of day, over city and country. 50 40 30 20 0 5 10 15 20 Time of day 100-T, (%) FIGURE 7 Concentrations of air pollution (100-T%), as...

Ngày tải lên: 01/04/2014, 11:44

... acidification and that the acid rain is pri- marily the result of long-range transport of pollutants from the heavily industrialized areas of northern Europe. The rain and snow in portions of eastern ... R.A. (1872), Air and Rain: The Beginnings of a Chemical Climatol- ogy. Longmans, Green, and Co., London, England. Stensland, G.J. and R.G. Semonin (1982), Another int...

Ngày tải lên: 10/08/2014, 20:20

... The first term on the right-hand side represents the rate of formation of particles of volume v due to coagulation, and the second term that rate of loss of particles of volume v by coagulation ... light-scattering properties of an individual particle are a function of its size, shape and refractive index. The intensity of scattered light is a function of the scat...

Ngày tải lên: 10/08/2014, 20:20

... attempts to control pollutants by declaring them to be criteria pollutants and setting air- quality standards resulted in the choice of emission controls instead of air-quality standards for toxic ... competition. (HbCO) (HbO) 210 PC O PO 22  (HbCO) and (HbO 2 ) are the concentrations of carboxyhemo- globin and oxyhemoglobin, and PCO and PO 2 are the partial pressures of...

Ngày tải lên: 10/08/2014, 20:20

... of time of day, over city and country. 50 40 30 20 05101520 Time of day 100-T, (%) FIGURE 7 Concentrations of air pollution (100-T%), as function of time of day, on clear day (solid line) and ... (m) A - EXTREMELY UNSTABLE B - MODERATELY UNSTABLE C - SLIGHTLY UNSTABLE D - NEUTRAL E - SLIGHTLY STABLE F - MODERATELY STABLE A B C D E F A - EXTREMELY...

Ngày tải lên: 10/08/2014, 20:20

... According to their state of matter, pollutants may be classi- fied as: (1) gaseous and (2) particulate. Gaseous Pollutants Most air pollutants exhibit gaseous prop- erties in that they tend ... combination of air pollut- ants (including primary pollutants) and natural components of the atmosphere. Some of these reactions require the pres- ence of sunlight and are calle...

Ngày tải lên: 10/08/2014, 20:20

... to apply his law of the minimum as rigidly as some have interpreted it, and we can best envision nutrient limitation from the standpoint of the balance and interac- tions of the whole nutrient ... north end of the lake and the southern end of the lake showed differ- ent periods of high productivity. This variability in productivity may be influenced by sewage discharge...

Ngày tải lên: 10/08/2014, 20:20

... condensation of low -vapor- pressure oxidation products of organic gases. The first step in organic-aerosol production is the formation of the low -vapor- pressure compound in the gas phase as a result of ... polycyclic aromatic ketones and quinines, steroids, N-containing com- pounds, regular steranes, pentacyclic triterpanes, and iso- and anteiso-alkanes (Seinfeld and P...

Ngày tải lên: 10/08/2014, 20:20

... primarily of bacteria, protozoa, and fungi, coats the surface of filter media. The activity in biological film is aerobic, with move- ment of oxygen, food and end-products in and out of it as ... Municipal Wastewater, Encyclopedia of Environmen- tal Science and Engineering, Vol. 1, edited by J. R. Pfafflin and E.N. Ziegler, Gordon and Breach, New York. 2. Gates,...

Ngày tải lên: 10/08/2014, 20:20