New Brunswick's Clean Air Act - Glossary

- I -

Immediate
With respect to the Environmental Emergency Reporting System as outlined within each approval, means a prompt response for a report to be filed with the Department of Environment following all spills of wastewater, petroleum or hazardous materials to the environment, or occurrences where there has been a violation of the Air Quality Regulation, the Water Quality Regulation or any approval condition.

Impaction
Refers to one of the principles upon which an air pollution control device used to control particulate matter emissions is based. When a moving stream is deflected from a straight course, some of the particles will lose momentum to continue moving in a straight line and be overcome by external forces such as gravity and fallout.

Impingement
Generally a term used in air quality dispersion modelling used to represent the act of the contaminant striking or passing through specific ground level locations. Also see Point of Impingement.

Impinger Catch
Impingers are part of the particulate matter sampling system sometimes referred to as a Method 5 Sampling Train, which traps the moisture in the sampled flue gas and also collects the very fine solid particulate matter less than three microns in diameter. The impinger catch refers to the fine solid particulate matter captured in the impingers during the sampling event and is sometimes asked to be collected and included in the calculation of particulate matter.

Inactive Applications
When used under section 12 (3) of the Clean Air Act means applications that are not presently active.

Incineration
An air pollution control principle used primarily for the reduction of an organic laden air waste stream. Also, can be used as a treatment technology for the destruction of waste by controlled burning at high temperatures. Incineration is based on the principles of combustion. At sufficiently high temperatures, adequate residence time and mixing any organic compound can be oxidized to carbon dioxide and water. There are two basic types of incinerators including the thermal incineration unit and the catalytic incineration unit.

Incompatible Chemicals
Two or more chemicals which, in the event they come into contact with each other, may cause an adverse reaction such as an explosion, fire, or emission of toxic gases.

Inlet and Outlet Disks of the Rotating Biological Contactor (RBC) 
See Rotating Biological Contractor (RBC).

Iodine (I₂).
Is a volatile, blackish grey crystalline solid element of the halogen family. It is used in medicine, chemical analysis, as a catalyst, as an indicator of chemical unsaturation and photography.

Ion Exchange Columns.
Refers to unit operations, which consist of a reversible process by which ions are interchanged between an insoluble material and a liquid with no substantial structural changes of the material.