By C. C. Lee
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Also called a day tank (EPA-97/12). Aged catalytic converter: A converter that has been installed on a vehicle or engine stand and operated through a cycle specifically designed to chemically age, including exposure to representative lead concentrations, and mechanically stress the catalytic converter in a manner representative of in-use vehicle or engine conditions (cf. 2122(a)(15)(ii)(F)91). Agglomeration: The (CAA/C02gas1-04). 9010-91). Aggregate exposure: The sum total of all exposure to pesticides through inhalation, or dermal, oral, or optic contact (FFDCNpesticide-04).
Add on control device: An air pollution control device such as carbon absorber or incinerator that reduces the pollution in an exhaust gas. The control device usually does not affect the process being controlled and thus is "add-on" technology, as opposed to a scheme to control pollution through altering the basic process itself (EPA-97/12). 81-91). Added risk: The difference between the cancer incidence under the exposure condition and the background incidence in the absence of exposure; AR = P(d) - P(0) (EPA-92/12).
2) A holding andlor treatment pond that speeds up the natural process of biological decomposition of organic waste by stimulating the growth and activity of bacteria that degrade organic waste (EPA-97/12). Aerated pond: See aerated lagoon. Aerated static pile: Forced aeration method of composting in which a free-standing composting pile is aerated by a blower moving air through perforated pipes located beneath the pile (RCRNmanagement-04). Aeration period: (1) The theoretical time, usually expressed in hours, that the mixed liquor is subjected to aeration in an aeration tank undergoing activated-sludge treatment.
Environmental engineering dictionary by C. C. Lee