Titration methodologies for monitoring of anaerobic digestion in developing countries: a review

An increase in volatile fatty acids (VFA) concentration (or the proportional decrease in carbonate alkalinity concentration) is the first practical measurable indication that an anaerobic treatment system is in a state of stress. If the system is not rectified at this early stage, failure is likely. Current methods for VFA measurement include distillation, colorimetry, gas chromatography and various titration techniques. In terms of simplicity, speed and cost-effectiveness it is generally accepted that titration methods are superior for the purpose of on-site routine monitoring and control, particularly in developing countries. This paper reviews the methods published in the last four decades concerning on-site titration measurement of VFA and carbonate alkalinity concentrations. The review encompasses the following: aquatic chemistry related to the theory on which most of the methods are based, and a detailed description of each of the principal methods published followed by critical and comparative evaluation. (C) 2004 Society of Chemical Industry.

[1]  S. R. Jenkins,et al.  Measuring anaerobic sludge digestion and growth by a simple alkalimetric titration , 1983 .

[2]  G. Lettinga,et al.  Substrate competition between methanogens and acetogens during the degradation of methanol in UASB reactors , 1995 .

[3]  Ori Lahav,et al.  Rapid, simple, and accurate method for measurement of VFA and carbonate alkalinity in anaerobic reactors. , 2002, Environmental science & technology.

[4]  D. W. De Haas,et al.  Use of a simple titration procedure to determine H2CO3* alkalinity and volatile fatty acids for process control in waste-water treatment , 1995 .

[5]  J. C. Converse,et al.  Improved alkalimetric monitoring for anaerobic digestion of high-strength wastes , 1986 .

[6]  Ori Lahav,et al.  Measurement of VFA in anaerobic digestion: The five-point titration method revisited , 2000 .

[7]  William A. Pretorius,et al.  pH-controlled feed-on-demand for high-rate anaerobic systems , 1994 .

[8]  Paul F. Greenfield,et al.  Estimating VFA concentrations in prefermenters by measuring pH , 1998 .

[9]  D. F. Toerien,et al.  Biological changes during the adaptation of an anaerobic digester to a synthetic substrate , 1967 .

[10]  G. vR. Moosbrugger,et al.  Weak acid/bases and pH control in anaerobic systems ― a review , 1993 .

[11]  G. A. Ekama,et al.  A 5 pH Point Titration Method for Determining the Carbonate and SCFA Weak Acid/Bases in Anaerobic Systems , 1993 .

[12]  D. Archer,et al.  On‐line titration method for monitoring buffer capacity and total volatile fatty acid levels in anaerobic digesters , 1989, Biotechnology and bioengineering.

[13]  A. Rozzi,et al.  Anaerobic process control by bicarbonate monitoring , 1985 .

[14]  Grietje Zeeman,et al.  Anaerobic sewage treatment , 2005 .

[15]  K. Buchauer,et al.  A comparison of two simple titration procedures to determine volatile fatty acids in influents to waste-water and sludge treatment processes , 1998 .

[16]  G. Gran.  Determination of the equivalence point in potentiometric titrations. Part II , 1952 .

[17]  M. Wentzel,et al.  Mixed weak acid/base systems. II : Dosing estimation, aqueous phase , 1991 .

[18]  Heiko Feitkenhauer,et al.  On-line titration of volatile fatty acids for the process control of anaerobic digestion plants. , 2002, Water research.

[19]  Grietje Zeeman,et al.  A REVIEW: THE ANAEROBIC TREATMENT OF SEWAGE IN UASB AND EGSB REACTORS , 1998 .