Evaluation of the Performance of Vetiveria zizanioides in Removing Nutrients from Wastewater
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1 (// // ). ( ).. ( ).. / /. : Evaluation of the Performance of Vetiveria zizanioides in Removing Nutrients from Wastewater A. Akbarzadeh 1 M. Vakhshouri 2 Sh. Jamshidi 3 M. Khalesidoost 4 (Received Sep. 23, 213 Accepted Feb. 23, 214) Abstract The aim of this study was to evaluate the growth of Vetiveria zizanioides under hydroponic conditions and its efficiency in removing nitrogen and phosphorus compounds from wastewaters. For this purpose, a pilot plant was constructed with a net volume of 6 liters which was intermittently fed for three months with the effluent from a domestic wastewater treatment plant. It was found that Vetiver exhibited a significant capability for living in polluted waters under hydroponic condition as evidenced by the growth of its leaves to 13 cm. Moreover, the average values of total nitrogen, total phosphorus, and biochemical oxidation demand (BOD) removal efficiencies over four days of retention time were 91%, 97%, and 75%, respectively. If used as a tertiary treatment unit, the plant needs a minimum retention time of two days to allow adequate time for the removal of such vital compounds as Ammonia and Phosphate by 95%, which is the typical standard limit for wastewater reuse or free discharge. Finally, it was observed that the total values of nitrogen and phosphorus absorbed in the leaves were 17 and 2.3 (mg/gr dry weight) while the same elements absorbed in the roots were measured as 13 and 1.8 (mg/gr dry weight), respectively. Keywords: Phytoremediation, Wastewater, Vetiver Grass, Nutrients. 1. Assist. Prof., Water Research Institute, Water and Wastewater Research Center, Tehran 2. MSc in Environmental Engineering, Azad Islamic University, Bushehr Science and Research Branch, Bushehr 3. PhD Student and Researcher at Water Research Institute, Water and Wastewater Research Center, Tehran (Corresponding Author) (+98 21) sh.jamshidi@ut.ac.ir 4. Research Staff Member, Water Research Institute, Water and Wastewater Research Center, Tehran sh.jamshidi@ut.ac.ir () ( ) 57
2 ...[].[]..[]...[] /.[ ].[]..[] 2 Typha Angustifolia 3 Total Phosphorus (TP) 4 Total Nitrogen (TN) 5 Fecal Coliforms 6 E. Coli 7 Biochemical Oxidation Demand (BOD) 8 Chemical Oxidation Demand (COD)..[ ]..[ ]..[].[]..[]...[] ( ) 1 Vetiveria Zizanioides 58
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9 EC ) ( F SO 4 HCO 3 BOD DO ( ) PO 4 3 NO 3 NO 2 NH 4 + () ± ± ± ± ± / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / ± / / ± / / ± / / ± / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / / ± / ) ) / / (. (...[]. / / /.... درصد حذف NH4 NO2 NO3 TN PO4 BOD SO4 پارامتر.( )
10 []. 1. Akarzadeh, A., Vakhshouri, M., and Arbabi, M. (213). An introduction of Vetiveria zizanioides as a novel approach for sustainable development and efficient water resource management. Proc. 2 nd National Conference of Environmental Planning and Conservation, Hamedan, Iran. (In Persian). 2. Vakhshouri, M. (213). Feasibility study of treating contaminated waters with excess nutrients using Vetiveria sp. MSc Thesis, Islamic Azad University of Science and Researches, Bushehr, Iran. (In Persian) 3. Troung, P., Van, T., and Pinners, E. (28). Vetiver system application: A technical reference manual, 2 nd Ed., Create Space Independent pub. Platform, UK. 4. Chomchalow, N. (211). Vetiver research, development and applications in Thailand. AU Journal of Technology, 14 (4), Mickovski, S. B., van Beek, L. P. H., and Salin, F. (25). Uprooting of vetiver uprooting resistance of vetiver grass (Vetiveria zizanioides). Plant and Soil, 278, Edelstein, M., Plaut, Z., Dudai, N., and BenHur, M. (29). Vetiver (Vetiveria zizanioides) responses to fertilization and salinity under irrigation conditions. J. of Environmental Management, 91, Klomjek, P., and Nitisoravut, S. (25). Constructed treatment wetland: A study of eight plant species under saline condition. Chemosphere, 58, Truong, P., and Hart, B. (21). Vetiver system for wastewater treatment, Technical Bulletin No. 21/2. Pacific Rim Vetiver Network, Office of the Royal Development Projects Board, Thailand. 9. Liao, X. (2). Studies on plant ecology and system mechanisms of constructed wetland for pig farm in south China. PhD Thesis, South China Agricultural University, Guangzhou, Gouangdong, China. 1. Jampeetong, A., Brix, H., and Kantawanichkul, S. (212). Effects of inorganic nitrogen forms on growth, morphology, nitrogen uptake capacity and nutrient allocation of four tropical aquatic macrophytes, Salvinia culcullata, Ipomoea aquatica, Cyperus involucratus and Vetiveria zizaniodes. Aquatic Botany, 97,
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