In:
Canadian Journal of Civil Engineering, Canadian Science Publishing, Vol. 37, No. 5 ( 2010-05), p. 787-795
Abstract:
From an engineering application point of view in reducing fugitive particulate matter emissions, this paper presents experimental data comparing the efficiency of woven straw at reducing entrained emissions of particulate matter with diameters less than 10 µm (PM 10 ) with that for particulate matter with diameters less than 2.5 µm (PM 2.5 ) at construction sites. A series of field-analogous experiments were carried out to continuously measure PM 10 and PM 2.5 using laser particle monitors in an artificial wind tunnel system. It was found that the efficiency of woven straw at reducing either PM 10 or PM 2.5 is significantly dependent on the woven straw coverage ratio. The maximum reduction efficiencies for PM 10 and PM 2.5 are about 40% and 12%, respectively. Note that the reduction efficiencies approach zero as the coverage ratio is less than about 40%. Total elimination of PM 2.5 and PM 10 emissions is not possible, even using full-coverage woven straw. Reduction of PM 2.5 emissions is less efficient than that of PM 10 emissions using woven straw, and this trend is likely more obvious with an increase in the woven straw coverage ratio. The ratio of reduction efficiencies (R) between PM 2.5 and PM 10 for woven straw decreased slightly with an increase in the woven straw coverage ratio. Overall, for wind speeds of 0.5–3.0 m/s, silt contents of 4.8%–21.0%, and soil moisture contents of 10%–30% as used in this work, the average value of R is 0.31. The effects of wind velocity, silt content, and moisture content on the reduction efficiencies are also discussed.
Type of Medium:
Online Resource
ISSN:
0315-1468
,
1208-6029
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2010
detail.hit.zdb_id:
1490923-6
Permalink