Influence of carrier concentration on the performance and microbial characteristics of a suspended carrier biofilm reactor

Abstract A renovated suspended carrier biofilm reactor was investigated for its capability of carbon oxidation and nitrification. The carrier used was polyvinyl chloride cylinder with 2.5 mm diameter and 2.5–3.0 mm height. The carrier filling ratio, which is defined as the volume ratio of carrier to the whole reactor, is a key characteristic parameter for the new reactor. The operational experiments under different carrier filling ratio ranging from 10 to 75% were conducted. Meanwhile, the pollutant removal rate and behaviour of the microorganisms, such as biomass and specific oxygen utilization rate (SOUR) activity, were monitored and analyzed. The results showed that when the influent chemical oxygen demand (COD) and ammonia was about 200 and 20 mg/l, hydraulic retention time of 1.0 h, the optimum carrier concentration was about 50%with the average COD and ammonia removal rate about 70 and 30%, respectively.

[1]  Bruce E. Rittmann,et al.  Study of Biofilm and Fluidization of Bioparticles in a Three-Phase Liquid-Fluidized-Bed Reactor , 1991 .

[2]  P. Vanrolleghem,et al.  Incorporation of biofilm activity in river biodegradation modeling: a case study for linear alkylbenzene sulphonate (LAS) , 2000 .

[3]  J J Heijnen,et al.  Control of heterotrophic layer formation on nitrifying biofilms in a biofilm airlift suspension reactor. , 1997, Biotechnology and bioengineering.

[4]  Hallvard Ødegaard,et al.  A new moving bed biofilm reactor - applications and results , 1994 .

[5]  V. Lazarova,et al.  An innovative process for waste water treatment: the circulating floating bed reactor , 1996 .

[6]  N. Nishijima,et al.  Algae-removal performance of a fluidized-bed biofilm reactor system for lake water treatment. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[7]  Hallvard Ødegaard,et al.  Treatment of Dairy Wastewater in a Novel Moving Bed Biofilm Reactor , 1992 .

[8]  M. Vieira,et al.  Intrinsic kinetics of biofilms formed under turbulent flow and low substrate concentrations , 1999 .

[9]  Hallvard Ødegaard,et al.  Nitrification in a moving bed biofilm reactor , 1994 .

[10]  M. Vieira,et al.  Physical stability and biological activity of biofilms under turbulent flow and low substrate concentration , 1999 .

[11]  Thomas Welander,et al.  Nitrification of landfill leachate using suspended-carrier biofilm technology , 1997 .

[12]  B. Rittmann,et al.  Contributions of biofilm versus suspended bacteria in an aerobic circulating-bed biofilm reactor. , 2001, Water Science and Technology.

[13]  V. Lazarova,et al.  Biofilm characterization and activity analysis in water and wastewater treatment , 1995 .

[14]  J. Tay,et al.  A balanced model for biofilms developed at different growth and detachment forces , 2003 .

[15]  B. Rittmann,et al.  Measurement of the Activity of a Biofilm: Effects of Surface Loading and Detachment on a Three-Phase, Liquid-Fluidized-Bed Reactor , 1992 .

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

[17]  C. Picioreanu,et al.  Influence of biomass production and detachment forces on biofilm structures in a biofilm airlift suspension reactor , 1998, Biotechnology and bioengineering.

[18]  M. V. van Loosdrecht,et al.  Detachment of biomass from suspended nongrowing spherical biofilms in airlift reactors , 1995, Biotechnology and bioengineering.

[19]  Thomas Welander,et al.  Biological nitrogen removal from municipal landfill leachate in a pilot scale suspended carrier biofilm process , 1998 .

[20]  M. Vieira,et al.  Influence of medium composition on the characteristics of a denitrifying biofilm formed by Alcaligenes denitrificans in a fluidised bed reactor , 2002 .

[21]  Krist V. Gernaey,et al.  Nitrification monitoring in activated sludge by oxygen uptake rate (OUR) measurements. , 1996 .

[22]  B. Rittmann,et al.  Biofilm detachment mechanisms in a liquid‐fluidized bed , 1991, Biotechnology and bioengineering.

[23]  P. Mccarty,et al.  Environmental Biotechnology: Principles and Applications , 2000 .

[24]  B. Peyton.  Effects of shear stress and substrate loading rate on Pseudomonas aeruginosa biofilm thickness and density , 1996 .