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9 Arch Dust Suppression Handbook <br />!III rAM• • -•IIIIIIIIII • • , r• I MOM= <br />afrai <br />- <br />• to <br />Why Dust Control? <br />Process and fugitive dust emissions are regulated pollutants. Standards adopted by <br />federal and state agencies are enforced to protect worker health and limit the amount of <br />particulate entering the environment. <br />The National Ambient Air Quality Standards (NAAQS) have targeted PM 10 (10 micron <br />particulate) because these very fine particles represent the most serious health hazard. <br />Why water -spray systems? <br />Dry collection systems are very efficient. However, this technology is capital intensive, <br />high maintenance, and applicable only to sources that can be enclosed. Filter fabrics <br />have limitations with stacking materials in a pile and the disposal of filters \ fabrics often <br />produce secondary emissions. <br />Water spray systems remain the most efficient and cost effective means of dust control <br />for both process and fugitive dust emissions. Reason; the dust remains with the product <br />of origin, while it is being disturbed. [For further information, see "Water -spray systems: <br />the dust -control workhorse", by Mark Kestner, Ph.D., Pit & Quarry, March 1991.] <br />Why Arch Fogger Systems? <br />Fogger systems were developed to overcome the deficiencies of conventional spray <br />systems as they are designed to suppress airborne dust without wetting the <br />product. To achieve proper atomization and suppression of fine or porous fugitive dust, <br />water spray pressures should exceed 90 psi. <br />Arch Fogger technology was designed for the aggregate, crushing and mining <br />industries. It has a proven track record; is simple and easy to maintain; and requires <br />minimal capital investment in comparison to other forms of dust suppression. <br />How can Arch Fogger Systems be enhanced? <br />Screen materials provide an environment for fogger systems to effectively bond water to <br />dust. To build durable and effective wind fences for all applications a woven, industrial <br />grade polyester fabric is effective at wind velocity reduction. Fences are applicable to <br />airborne particulate collection i.e., sand, dust, wood fiber, etc. <br />Surfactants or other forms of bonding agents further enhance the bonding characteristics of <br />dust particles. These agents are available to match the chemistries of the particulate <br />matter being addressed. <br />Page 2 <br />