Application of water super absorbents in waste air biofiltration |
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Authors: | Mohsen Akbari Mohammad Hassan Fazaelipoor and Ataollah Soltai Goharizi |
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Institution: | (1) Department of Systems and Engineering Management, Air Force Institute of Technology/ENV, 2950 Hobson Way, Wright-Patterson AFB, OH 45433-7765, USA;(2) University of Missouri-Rolla, Rolla, MO, USA |
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Abstract: | Water super absorbents are low cross-linked hydrophilic polymers that absorb water in amounts up to several hundred times
their dry weight. In this study, the effect of adding these materials to the bed of a biofilter was investigated. Two equal
size biofilters were used for this purpose. One of the biofilters was packed with a mixture of perlite and a commercial polyacrylamide
based super absorbent (2.3% dry weight), and the other was packed with perlite to perform as a control. The biofilters were
inoculated with a bacterial culture that was able to grow on n-hexane as the sole source of carbon and energy. Both biofilters
removed up to 90% of the entering pollutants when using an inlet n-hexane concentration of 1 g/m3, and an air flow rate of 0.3 L/min (mass loading of 18.34 g/m3/h, and empty bed residence time of 3.27 min). The super absorbent had a positive effect on the performance of the biofilter.
While the difference in the performance of the biofilters was marginal when frequent moistening was applied, the difference
was considerable when moistening was less frequent. |
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