Environmental Studies

Air Pollution Control Equipment Selection Guide, Second by Kenneth C. Schifftner

By Kenneth C. Schifftner

This e-book is an efficient dialogue of varied pollution keep an eye on gear. It covers quite a lot of gear and offers an outstanding evaluation of the foundations and purposes. Very worthy is the sensible reviews that aren't usually on hand in a regular textbook. The language is simple to appreciate, in particular in case you should not have formal education in pollution keep watch over. It offers hybrid structures such Read more...

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Extra info for Air Pollution Control Equipment Selection Guide, Second Edition

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If the acid gas content is somewhere in between and the plant does not have water treatment capability, a spray dryer (dry scrubber) followed by a baghouse or precipitator might be a better choice. When sizing the actual equipment, the designer must know (or estimate) the gas volumetric and often mass flow rates through the system. For most gas streams, the conditions approximate atmospheric conditions in that the systems operate at relatively low pressures (within a few pounds’ gauge of atmospheric pressure) and temperatures of under 2,000°F.

Application engineers have developed adsorption isotherms for various pollutants as they relate to specific adsorbent types. ), each exemplifying specific pore size and area characteristics. ). predict the rate of capture of that pollutant in the adsorbent and to therefore anticipate breakthrough. 2 shows a typical adsorption isotherm curve. Adsorption tends to follow the lessons learned earlier about number of transfer units (NTUs) and driving force. The concentration gradient is important in adsorption processes because a large gradient tends to fill pores quickly, thereby reducing the probability of continued adsorption at a high rate.

The biomass support medium is the packing and the biofilm is the absorbing liquid. In the case of biofilters, however, the biofilm is stationary. It is attached to the support medium. The gas, therefore, is caused to move slowly through the biomass so that the contaminant gas can diffuse over to the biofilm surface, and time is allowed for the gas to penetrate the biofilm surface. As a result, gas velocities are under 1 to 2 ft/sec. Biofilters therefore are usually large devices. They need not be unsightly, however.

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