Process Emissions Monitoring and Control

Abstract

Some manufacturing, research, and development conducted within AT&T involves processes that emit air contaminants. These emissions are confined, scrubbed to recover the constituents, and vented outside through stacks. Continuous emission monitoring (CEM) systems analyze the emissions in near-real time and provide feedback to control them. The information collected from CEM systems in some industries is used to prove compliance with applicable environmental regulations. This paper describes CEM technology and an Environmental Monitoring and Reporting System (EMARS) for near-real-time emissions monitoring. It also presents selected applications in AT&T Bell Laboratories and AT&T manufacturing facilities at Montgomery and Richmond.

Effects of Silcosteel� transfer line on the sampling of volatile organic compounds

“…10 Even analyses of VOCs in water generate a VOC vapor sample through purging of the sample with helium or a similar gas, and new in situ methods of analyzing water for VOCs will require use of transfer lines. Although almost any kind of tubing may be used to transfer a vapor sample, many tubing materials such as Nylon ᭨ , Tygon ᭨ , PVC, or rubber products, can adsorb (and absorb) the VOCs or corrupt the vapor samples by off-gassing VOCs still present in the tubing material.…”