| Autor: |
Gillies, John A.1 jackg@sage.dri.edu, Watson, John G.1, Rogers, C. Fred1, DuBois, David1, Chow, Judith C.1, Langston, Rodney2, Sweet, James2 |
| Předmět: |
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| Zdroj: |
Journal of the Air & Waste Management Association (Air & Waste Management Association). Jan99, Vol. 49 Issue 1, p3-16. 14p. 1 Diagram, 4 Charts, 8 Graphs, 1 Map. |
| Abstrakt: |
A 14-month study was undertaken to assess the long-term efficiencies of four dust suppressants (i.e., biocatalyst stabilizer, polymer emulsion, petroleum emulsion with polymer, and nonhazardous crude-oil-containing materials) to reduce the emission of PM[sub10] from public unpaved roads. PM[sub10] emission rates were calculated for each test section and for an untreated section for comparison purposes. Emission rates were determined from PM[sub10] concentrations measured from 1.25 m to 9 m upwind and downwind of the road and above its surface. Calculated emission factors ranged between zero and 1,361 g-PM[sub10]/vehicle kilometer traveled (VKT) (average uncertainty = ±35 g-PM[sub10]/VKT) for the four types applied. One week after application, suppressant efficiencies ranged between 33% and 100% for the four types applied. After 8-12 months of exposure to weathering and 4,900-6,400 vehicle passes, the suppressant efficiencies ranged from zero to 95%. Roadway surface properties associated with low-emitting, well-suppressed surfaces are (1) surface silt loading and (2) strength and flexibility of suppressant material as a surface layer or cover. Suppressants that create surface conditions resistant to brittle failure are less prone to deterioration and more likely to increase long-term reduction efficiency for PM[sub10] emissions on unpaved roads. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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