A kinetic study of autohydrogenotrophic denitrification at the optimum pH and sodium bicarbonate dose

Ghafari, S. and Hasan, M. and Aroua, M.K. (2010) A kinetic study of autohydrogenotrophic denitrification at the optimum pH and sodium bicarbonate dose. Bioresource Technology, 101 (7). pp. 2236-2242. ISSN 0960-8524, DOI https://doi.org/10.1016/j.biortech.2009.11.068.

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In this study the kinetics of autohydrogenotrophic denitrification was studied under optimum solution pH and bicarbonate concentration. The optimal pH and bicarbonate concentration were firstly obtained using a design of experiment (DOE) methodology. For this purpose a total of 11 experiments were carried out. Sodium bicarbonate concentrations ranging of 20-2000 mg/L and pH values from 6.5 to 8.5 were used in the optimization runs. It was found that the pH has a more pronounced effect on the denitrification process as compared to the bicarbonate dose. The developed quadratic model predicted the optimum conditions at pH 8 and 1100 mg NaHCO 3/L. Using these optimal conditions, the kinetics of denitrification for nitrate and nitrite degradation were investigated in separate experiments. Both processes were found to follow a zero order kinetic model. The ultimate specific degradation rates for nitrate and nitrite remediation were 29.60 mg NO - 3-N/g MLVSS/L and 34.85 mg NO - 3-N/g ]MLVSS/L respectively, when hydrogen was supplied every 0.5 h.

Item Type: Article
Additional Information: Cited By (since 1996):7 Export Date: 21 April 2013 Source: Scopus CODEN: BIRTE :doi 10.1016/j.biortech.2009.11.068 Language of Original Document: English Correspondence Address: Aroua, M.K.; Faculty of Engineering, Department of Chemical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; email: mkaroua@um.edu.my References: Abeling, U., Seyfried, C.F., Anaerobic-aerobic treatment of high-strength ammonium wastewater-nitrogen removal via nitrite (1992) Water Sci. Technol., 26 (5-6), pp. 1007-1015; Adams, W., (2006) Handbook for Experimenters version 7.3, , Stat-Ease Inc., Minneapolis, MN, USA; Dhamole, P.B., Nair, R.R., D'Souza, S.F., Lele, S.S., Denitrification of high strength nitrate waste (2007) Bioresour. Technol., 98 (2), pp. 247-252; Foglar, L., Briski, F., Sipos, L., Vukovi, M., High nitrate removal from synthetic wastewater with the mixed bacterial culture (2005) Bioresour. Technol., 96 (8), pp. 879-888; Ghafari, S., Hasan, M., Aroua, M.K., Bio-electrochemical removal of nitrate from water and wastewater-A review (2008) Bioresour. Technol., 99 (10), pp. 3965-3974; Ghafari, S., Hasan, M., Aroua, M.K., Effect of carbon dioxide and bicarbonate as inorganic carbon sources on growth and adaptation of hydrogenotrophic denitrifying bacteria (2009) J. Hazard. Mater., 162 (2-3), pp. 1507-1513; Ghafari, S., Hasan, M., Aroua, M.K., Improvement of autohydrogenotrophic nitrite reduction rate through optimization of pH and bicarbonate dose in a batch experiments (2009) J. Biosci. Bioeng., 107 (3), pp. 275-280; Glass, C., (1997) Optimized denitrification of concentrated nitrate wastes under saline conditions in bench-scale sequencing batch reactors, , Ph.D. thesis, Department of Civil, Environmental and Architectural Engineering, University of Colorado, Boulder, CO, USA; Glass, C., Silverstein, J., Denitrification kinetics of high nitrate concentration water: pH effect on inhibition and nitrite accumulation (1998) Water Res, 32 (3), pp. 831-839; Kurt, M., Dunn, I.J., Bourne, J.R., Biological denitrification of drinking water using autotrophic organisms with H2 in a fluidized-bed biofilm reactor (1987) Biotechnol. Bioeng., 29 (4), pp. 493-501; Lee, K.C., Rittmann, B.E., Effects of pH and precipitation on autohydrogenotrophic denitrification using the hollow-fiber membrane-biofilm reactor (2003) Water Res, 37 (7), pp. 1551-1556; Pala, A., Blükbas�, O., Evaluation of kinetic parameters for biological CNP removal from a municipal wastewater through batch tests (2005) Process Biochem, 40 (2), pp. 629-635; Rezania, B., Cicek, N., Oleszkiewicz, J.A., Kinetics of hydrogen-dependent denitrification under varying pH and temperature conditions (2005) Biotechnol. Bioeng., 92 (7), pp. 900-906; Shrimali, M., Singh, K.P., New methods of nitrate removal from water (2001) Environ. Pollut., 112 (3), pp. 351-359; Smith, R.L., Ceazan, M.L., Brooks, M.H., Autotrophic, hydrogen-oxidizing, denitrifying bacteria in groundwater, potential agents for bioremediation of nitrate contamination (1994) Appl. Environ. Microbiol., 60 (6), pp. 1949-1955; Van Rijn, J., Tal, Y., Schreier, H.J., Denitrification in recirculating systems: Theory and applications (2006) Aquacul. Eng., 34 (3), pp. 364-376; Vasiliadou, I.A., Pavlou, S., Vayenas, D.V., A kinetic study of hydrogenotrophic denitrification (2006) Process Biochem, 41 (6), pp. 1401-1408; Wang, J-H., Baltzis, B.C., Lewandowski, G.A., Fundamental denitrification kinetic studies with Pseudomonas denitrificans (1995) Biotechnol. Bioeng., 47 (1), pp. 26-41; Watanabe, T., Motoyama, H., Kuroda, M., Denitrification and neutralization treatment by direct feeding of an acidic wastewater containing copper ion and high-strength nitrate to a bio-electrochemical reactor process (2001) Water Res, 35 (17), pp. 4102-4110
Uncontrolled Keywords: denitrification; optimization; kinetics; ph; bicarbonate; high-strength nitrate; waste-water; denitrifying bacteria; biofilm reactor; removal; nitrite.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 16 Jul 2013 05:08
Last Modified: 11 Dec 2013 02:46
URI: http://eprints.um.edu.my/id/eprint/7428

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