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Glossary

 obligate aerobes
organisms that require the presence of molecular oxygen ([O(2)] for their metabolism.
 obligate anaerobes
organisms for which the presence of molecular oxygen is toxic. These organisms derive the oxygen needed for cell synthesis from chemical compounds.
 occlude
to cause to become obstructed or closed and thus prevent passage either into or from.
 octanol/water partition coefficient (Kow)
a coefficient representing the ratio of the solubility of a compound in octanol (a non-polar solvent) to its solubility in water (a polar solvent). The higher the Kow, the more non-polar the compound. Log Kow is generally used as a relative indicator of the tendency of an organic compound to adsorb to soil. Log Kow values are generally inversely related to aqueous solubility and directly proportional to molecular weight.
 off-gas treatment system
refers to the unit operations used to treat (i.e. condense, collect, or destroy) contaminants in the purge gas from the thermal desorber.
 OPEC
Organization of Petroleum Exporting Countries, oil producing and exporting countries that have organized for the purpose of negotiating with oil companies on matters of oil production, prices, and future concession rights. Current members are Algeria, Gabon, Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, United Arab Emirates, and Venezuela.
 Open Dealer
An individual (who may own several properties that retail gasoline products) owns and operates the building/facility/property (as opposed to a lessee dealer who does not own the property). The typical open dealer operates between 1 and 10 locations. A major or regional oil company, or a large local wholesaler supplies the facility directly. Open dealers can evolve into a distributor if they achieve a large enough volume.
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