Metal Finishing Guide Book

2012 Organic Finishing Guidebook Issue

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Page 237 of 331

inorganic particulate. • Required Pollutant Control Efficiency: Many federal, state and local VOC and HAP emission limits for surface coating operations are ex- pressed in terms of one or more of the following: lb per gallon minus water lb per gallon coating solids as applied (e.g. as sprayed) lb per gallon of applied coating solids (e.g. auto & light truck) These limits may be met either by applying coatings meeting these emission limits without add-on controls or achieving an equivalent limit with add-on controls. For auto and light truck surface coating operations, the paint solids transfer efficiency (TE) is part of the calculation. Some state and local regulations require a minimum TE for certain coating operation in addition to a VOC or HAP content limit. If a catalytic or thermal oxidizer is used to control VOC or HAP emissions, 95% minimum destruction efficiency is generally required. An overall 90% minimum VOC or HAP destruction efficiency is generally required if a carbon or zeolite adsorber is used to concentrate emissions prior to destruction in an oxidizer. However, 80% combined system destruction efficiencies have been allowed for plastic parts spray booths employing a carbon adsorber in series with a thermal oxidizer. At least one permitting agency requires a minimum VOC control efficiency for major sources and others allow it as an alternative to laborious record keeping required to demonstrate compliance with individual coating emission limits. • Ohio Administrative Code (OAC) 3745-21-07 (G) Operations Using Liquid Organic Material requires discharge of organic materials (i.e. VOC) be reduced by at least 85% from applying, evaporating or dry- ing any photochemically reactive material and any liquid organic ma- terial that is baked, heat-cured or heat polymerized. • Section 215.205 22 Illinois Regulation 11427 allows operators of coating lines alternative emission limitations to individual coating emission limits for emissions controlled by an afterburner (thermal oxidizer): 81% (75% for can coating) reduction in the overall emis- sions of volatile organic material from the coating line, and Oxidation to carbon dioxide and water of 90% of nonmethane volatile organic material (measured as total combustible carbon) which en- ters the afterburner. • Under South Coast Air Quality Management District (SCAQMD) of California (Los Angeles) Rules 1107 Coating of Metal Parts & Prod- ucts and 1145 Plastic, Rubber and Glass Coating, lines may comply with these regulations using pollution control equipment provided VOC emissions are reduced as follows: • The control device shall reduce VOC emissions from an emission col- lection system by at least 95% by weight or the output of the air pol- 236

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