Influence of 2,4-dinitrophenol on the characteristics of activated sludge in batch reactors.

The response of activated sludge characteristics to the presence of 2,4-dinitrophenol (dNP) in batch cultures was investigated in this study. The sludge yield slightly decreased with an increase in dNP concentration. At 10 mg l(-1), or lower, dNP significantly reduced sludge yield and relative specific growth rates (mu/mu0), but didn't substantially affect its relative specific chemical oxygen demand removal rate (q/q0). Presence of dNP at 1-20 mg l(-1) increased the specific oxygen uptake rate of activated sludge, and slightly changed its hydrophobicity. An analysis on inhibition indicated that the reduction in sludge yield in the presence of dNP was mainly attributed to the significant decreased sludge growth, rather than the reduced substrate degradation.

[1]  M. C. Tomei,et al.  Toxicity assessment of common xenobiotic compounds on municipal activated sludge: comparison between respirometry and Microtox. , 2004, Water research.

[2]  D. Stuckey,et al.  Soluble microbial products formation in anaerobic chemostats in the presence of toxic compounds. , 2004, Water research.

[3]  Yu Liu,et al.  Chemically reduced excess sludge production in the activated sludge process. , 2003, Chemosphere.

[4]  H. D. Stensel,et al.  Activated‐Sludge Yield Reduction Using Chemical Uncouplers , 1999 .

[5]  J. Etxebarria,et al.  A comparison of five rapid direct toxicity assessment methods to determine toxicity of pollutants to activated sludge. , 2002, Chemosphere.

[6]  Hanqing Yu,et al.  Production of extracellular polymeric substances from Rhodopseudomonas acidophila in the presence of toxic substances , 2005, Applied Microbiology and Biotechnology.

[7]  John N. Lester,et al.  Formation and conditional stability constants of complexes formed between heavy metals and bacterial extracellular polymers , 1984 .

[8]  M. C. Tomei,et al.  Kinetics of 4-nitrophenol biodegradation in a sequencing batch reactor. , 2003, Water research.

[9]  Biological Hydrogen Production by Enriched Anaerobic Cultures in the Presence of Copper and Zinc , 2004, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[10]  Guang-Hao Chen,et al.  Utilization of a metabolic uncoupler, 3,3',4',5-tetrachlorosalicylanilide (TCS) to reduce sludge growth in activated sludge culture. , 2002, Water research.

[11]  H. Chase,et al.  The use of chemical uncouplers for reducing biomass production during biodegradation , 1998 .

[12]  S. Gupta,et al.  Effect of shock and mixed nitrophenolic loadings on the performance of UASB reactors. , 2006, Water research.

[13]  P. Frymier,et al.  Kinetics of the toxicity of metals to luminescent bacteria , 2003 .

[14]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[15]  H. Güttinger,et al.  Complex dynamics of adaptation in a nonaxenic microcystis culture. 1. Effects of dinitrophenol on population growth. , 2001, Ecotoxicology and environmental safety.

[16]  J. Russell,et al.  Energetics of bacterial growth: balance of anabolic and catabolic reactions. , 1995, Microbiological reviews.

[17]  H. Chase,et al.  Reducing production of excess biomass during wastewater treatment , 1999 .