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Received December 9, 2010
Accepted October 12, 2011
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Inhibitory effect of 2,4-dichlorophenol on nitrogen removal in a sequencing batch reactor
School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
silingng@gmail.com
Korean Journal of Chemical Engineering, July 2012, 29(7), 886-890(5), 10.1007/s11814-011-0267-2
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Abstract
We examined the inhibitory effect of 2,4-dichlorophenol (2,4-DCP) on nitrogen removal in the sequencing batch reactor (SBR) system. The reactor was operated with FILL, REACT (nitrification: denitrification), SETTLE, DRAW and IDLE phases in the duration ratio of 2 : 12 (9 : 3) : 1 : 1 : 8 for a 24 h cycle time. The deterioration of 2,4-DCP removal efficiency from 100 to 41% was observed when the influent concentration of 2,4-DCP was increased to 30mg/L. The residual 2,4-DCP remaining in the mixed liquor was found to inhibit the nitrification process, resulting in the decrease of nitrogen removal efficiency to 25 %. For kinetic study, the result showed that the experimental data of ammoniacal nitrogen (AN) removal at every stage fitted well to the first-order kinetics equation with high R2 values. The rate constant of AN removal, kAN, decreased with increasing influent concentration of 2,4-DCP, from 0.053 to 0.0006/min when 2,4-DCP concentration increased from 0 to 30 mg/L, respectively. However, the observed gradual recovering of AN removal with respect to the removal efficiency and kinetics during the recovery stage indicated that the inhibitory effect of 2,4-DCP on the nitrification process was reversible.
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APHA, Standard methods for the examination of water and wastewater, 20th Ed., America Public Health Association, Washington,DC (1998)
Chen GW, Yu HQ, Liu HX, Xu DQ, Process Biochem., 41, 1758 (2006)
Sheng GP, Yu HQ, Yue ZB, Appl. Microbiol. Biotechnol., 69(2), 216 (2005)
Jiang HL, Tay JH, Maszenan AM, Tay STL, Appl. Environ. Microbiol., 70, 6767 (2004)
Ren S, Frymier PD, Adv. Environ. Res., 7, 537 (2003)
Liu Y, Chen GH, Biotechnol. Bioeng., 55(3), 571 (1997)
Russell JB, Cook GM, Microbiol. Rev., 59, 48 (1995)
Ni BJ, Xie WM, Liu SG, Yu HQ, Wang YZ, Wang G, Dai XL, Water Res., 43, 751 (2009)
Li AJ, Yang SF, Li XY, Gu JD, Water Res., 42, 3552 (2008)
Sahinkaya E, Dilek FB, J. Environ. Manage., 83, 427 (2007)
Holman JB, Wareham DG, Biochem. Eng. J., 22, 125 (2005)
Yang L, Alleman JE, Water Sci. Technol., 26, 997 (1992)
