A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Removal of Ultrafine and Fine Particulate Matter from Air by a Granular Bed Filter
The removal efficiency of granular filters packed with lava rock and sand was studied for collection of airborne particles 0.05–2.5 μm in diameter. The effects of filter depth, packing wetness, grain size, and flow rate on collection efficiency were investigated. Two packing grain sizes (0.3 and 0.15 cm) were tested for flow rates of 1.2, 2.4, and 3.6 L/min, corresponding to empty bed residence times (equal to the bulk volume of the packing divided by the airflow rate) in the granular media of 60, 30, and 20 sec, respectively. The results showed that at 1.2 L/min, dry packing with grains 0.15 cm in diameter removed more than 80% (by number) of the particles. Particle collection efficiency decreased with increasing flow rate. Diffusion was identified as the predominant collection mechanism for ultrafine particles, while the larger particles in the accumulation mode of 0.7–2.5 μm were removed primarily by gravitational settling. For all packing depths and airflow rates, particle removal efficiency was generally higher on dry packing than on wet packing for particles smaller than 0.25 μm. The results suggest that development of biological filters for fine particles is possible.
Removal of Ultrafine and Fine Particulate Matter from Air by a Granular Bed Filter
The removal efficiency of granular filters packed with lava rock and sand was studied for collection of airborne particles 0.05–2.5 μm in diameter. The effects of filter depth, packing wetness, grain size, and flow rate on collection efficiency were investigated. Two packing grain sizes (0.3 and 0.15 cm) were tested for flow rates of 1.2, 2.4, and 3.6 L/min, corresponding to empty bed residence times (equal to the bulk volume of the packing divided by the airflow rate) in the granular media of 60, 30, and 20 sec, respectively. The results showed that at 1.2 L/min, dry packing with grains 0.15 cm in diameter removed more than 80% (by number) of the particles. Particle collection efficiency decreased with increasing flow rate. Diffusion was identified as the predominant collection mechanism for ultrafine particles, while the larger particles in the accumulation mode of 0.7–2.5 μm were removed primarily by gravitational settling. For all packing depths and airflow rates, particle removal efficiency was generally higher on dry packing than on wet packing for particles smaller than 0.25 μm. The results suggest that development of biological filters for fine particles is possible.
Removal of Ultrafine and Fine Particulate Matter from Air by a Granular Bed Filter
Ozis, Fethiye (author) / Singh, Manisha (author) / Devinny, Joseph (author) / Sioutas, Constantinos (author)
Journal of the Air & Waste Management Association ; 54 ; 935-940
2004-08-01
6 pages
Article (Journal)
Electronic Resource
Unknown
| Elsevier | 2024
Current Understanding of Ultrafine Particulate Matter Emitted from Mobile Sources
| Taylor & Francis Verlag | 2009
Characterization of ultrafine particulate matter from traditional and improved biomass cookstoves
| BASE | 2012
Characterization of ultrafine particulate matter from traditional and improved biomass cookstoves
| BASE | 2012