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International Journal of Chemical Reactor Engineering

Ed. by de Lasa, Hugo / Xu, Charles Chunbao

IMPACT FACTOR 2017: 0.881
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Volume 16, Issue 11


Volume 17 (2019)

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Fractal Analysis of pH Time-Series of an Anaerobic Digester for Cheese Whey Treatment

Dianna Sánchez-García / Héctor Hernández-García / Hugo O. Mendez-Acosta / Alberto Hernández-Aguirre
  • Departamento de Energía, Universidad Autónoma Metropolitana-Azcapotzalco, México D.F., México
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Héctor Puebla
  • Departamento de Energía, Universidad Autónoma Metropolitana-Azcapotzalco, México D.F., México
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Eliseo Hernández-Martínez
Published Online: 2018-07-05 | DOI: https://doi.org/10.1515/ijcre-2017-0261


Cheese whey is a byproduct of the cheese industry and contains high concentrations of organic matter. Anaerobic digestion (AD) technology is an attractive solution to whey disposal since it allows the reduction of organic matter and simultaneously generates energy via biogas. The biological degradation of cheese whey is characterized by an unstable operation. A critical operational issue in the AD treatment of cheese whey is the tendency of rapid acidification of the waste requiring robust monitoring and control systems for reliable and efficient operation. Recent studies show that techniques based on fractal analysis of time series can be used for the indirect monitoring of critical variables of AD process (i. e., COD, VFA and methane production) for agro-industrial wastewaters. In this work, the application of the fractal analysis of pH time series obtained from an up-flow digester for cheese whey treatment is presented. The results suggest that fractal analysis can be applied to the indirect monitoring of a representative and high strength dairy wastewater. Furthermore, although the complex phenomena underlying in pH in the AD of cheese whey, the fractal analysis can unveil correlations of fractal parameters with key process variables.

Keywords: cheese whey treatment; pH time-series; fractal analysis; indirect monitoring


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About the article

Received: 2017-12-29

Accepted: 2018-06-26

Revised: 2018-06-12

Published Online: 2018-07-05

Citation Information: International Journal of Chemical Reactor Engineering, Volume 16, Issue 11, 20170261, ISSN (Online) 1542-6580, DOI: https://doi.org/10.1515/ijcre-2017-0261.

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