The method is based on a very simple reaction of iron

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Unformatted text preview: ctural and magnetic properties. Compared with other synthetic methods, the present method is economical, low temperature and free of pollution which will make it suitable for large scale production. 89 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia ENV-O5 COMPARISON OF THE PERFORMANCE OF BAFFLED AND UNBAFFLED CONSTRUCTED WETLANDS IN NITROGEN REMOVAL H.C. Tee, C.E. Seng, M.A.Mohd Nawi and P. E. Lim School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: thc8477@yahoo.com This study aims to compare the performance of baffled and unbaffled horizontal subsurface -flow constructed wetlands in nitrogen removal and to evaluate the potential of unmodified waste material – raw rice hulls as wetland media for the treatment of wastewater. Four units of experimental-scale horizontal subsurface-flow constructed wetlands were built and set up outdoors. Two of the units were baffled to allow horizontal and vertical flows sequentially and the other two were unbaffled horizontal flow units. Each of the baffled and unbaffled wetland units was planted with cattails ( Typha latifolia). The units were operated and fed with domestic wastewater at a nominal hydraulic retention time (HRT) of 5, 3 and 2 days for 360, 90 days and 64 days, respectively. The planted baffled wetland unit achieved 99, 83, and 74 % in ammonia nitrogen (AN) removal, whereas the planted unbaffled wetland unit only achieved 96, 70, and 55 % for HRTs 5, 3 and 2 days, respectively. Correspondingly, the unplanted baffled and unbaffled of wetland units achieved 49, 43, and 35 %, and 41, 35, and 26 %, respectively. The results show that planted wetland units performed better than the unplanted ones in AN removal. The results also demonstrate that the removal of AN was more efficient in the baffled wetland units compared to the unbaffled wetland units (planted or unplanted). This could be explained by the oxidation reduction potential (ORP) detected in the wetland units. ENV-O6 ADSORPTION OF 4-CHLOROPHENOL...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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