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Modeling and Analysis of Biogas Generation Rate Sensitivity to Initial-pH, Leachate-Level and Ash-Loading during Anaerobic Biodegradation of Organic Solid Waste

Received: 10 May 2014     Accepted: 3 June 2014     Published: 20 June 2014
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Abstract

Anaerobic biodegradation of solid waste food-residues mixed with fruit-waste was carried out at mesophilic conditions. The goal was to model the sensitivity of biogas generation rate to initial-pH, leachate-level and ash-loading. Two process parameters were analyzed at centre-points while the third factor was set at low-, mid- and high-levels. The simulation results showed that at initial-pH of 5 (low-level), the biogas generation rate was more sensitive to ash-loading than at high-level of initial-pH values. The minimum and maximum attainable biogas generation rates due to perturbations in ash-loading were 0.79 and 1.89 mL/min, respectively, representing a difference of 1.10 mL/min. A comparison using sensitivity quotient revealed that decreasing leachate-level had a stronger effect on biogas generation rate than increasing it. It was also found that the biodegradation process was over four-times more sensitive to variations in initial-pH than in ash-loading while it was over seven-times more sensitive to variations in initial-pH than in leachate-level. It was concluded that the sensitivity of biogas generation rate was highest to variations in initial-pH and least to variations in leachate-level.

Published in American Journal of Chemical Engineering (Volume 2, Issue 3)
DOI 10.11648/j.ajche.20140203.11
Page(s) 21-27
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2014. Published by Science Publishing Group

Keywords

Modeling Biogas Generation, Anaerobic Biodegradation, Sensitivity, Mesophilic, Organic Solid Waste Decomposition

References
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Cite This Article
  • APA Style

    William Wanasolo, Samwel Manyele, John Makunza. (2014). Modeling and Analysis of Biogas Generation Rate Sensitivity to Initial-pH, Leachate-Level and Ash-Loading during Anaerobic Biodegradation of Organic Solid Waste. American Journal of Chemical Engineering, 2(3), 21-27. https://doi.org/10.11648/j.ajche.20140203.11

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    ACS Style

    William Wanasolo; Samwel Manyele; John Makunza. Modeling and Analysis of Biogas Generation Rate Sensitivity to Initial-pH, Leachate-Level and Ash-Loading during Anaerobic Biodegradation of Organic Solid Waste. Am. J. Chem. Eng. 2014, 2(3), 21-27. doi: 10.11648/j.ajche.20140203.11

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    AMA Style

    William Wanasolo, Samwel Manyele, John Makunza. Modeling and Analysis of Biogas Generation Rate Sensitivity to Initial-pH, Leachate-Level and Ash-Loading during Anaerobic Biodegradation of Organic Solid Waste. Am J Chem Eng. 2014;2(3):21-27. doi: 10.11648/j.ajche.20140203.11

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  • @article{10.11648/j.ajche.20140203.11,
      author = {William Wanasolo and Samwel Manyele and John Makunza},
      title = {Modeling and Analysis of Biogas Generation Rate Sensitivity to Initial-pH, Leachate-Level and Ash-Loading during Anaerobic Biodegradation of Organic Solid Waste},
      journal = {American Journal of Chemical Engineering},
      volume = {2},
      number = {3},
      pages = {21-27},
      doi = {10.11648/j.ajche.20140203.11},
      url = {https://doi.org/10.11648/j.ajche.20140203.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajche.20140203.11},
      abstract = {Anaerobic biodegradation of solid waste food-residues mixed with fruit-waste was carried out at mesophilic conditions. The goal was to model the sensitivity of biogas generation rate to initial-pH, leachate-level and ash-loading. Two process parameters were analyzed at centre-points while the third factor was set at low-, mid- and high-levels. The simulation results showed that at initial-pH of 5 (low-level), the biogas generation rate was more sensitive to ash-loading than at high-level of initial-pH values. The minimum and maximum attainable biogas generation rates due to perturbations in ash-loading were 0.79 and 1.89 mL/min, respectively, representing a difference of 1.10 mL/min.  A comparison using sensitivity quotient revealed that decreasing leachate-level had a stronger effect on biogas generation rate than increasing it. It was also found that the biodegradation process was over four-times more sensitive to variations in initial-pH than in ash-loading while it was over seven-times more sensitive to variations in initial-pH than in leachate-level. It was concluded that the sensitivity of biogas generation rate was highest to variations in initial-pH and least to variations in leachate-level.},
     year = {2014}
    }
    

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  • TY  - JOUR
    T1  - Modeling and Analysis of Biogas Generation Rate Sensitivity to Initial-pH, Leachate-Level and Ash-Loading during Anaerobic Biodegradation of Organic Solid Waste
    AU  - William Wanasolo
    AU  - Samwel Manyele
    AU  - John Makunza
    Y1  - 2014/06/20
    PY  - 2014
    N1  - https://doi.org/10.11648/j.ajche.20140203.11
    DO  - 10.11648/j.ajche.20140203.11
    T2  - American Journal of Chemical Engineering
    JF  - American Journal of Chemical Engineering
    JO  - American Journal of Chemical Engineering
    SP  - 21
    EP  - 27
    PB  - Science Publishing Group
    SN  - 2330-8613
    UR  - https://doi.org/10.11648/j.ajche.20140203.11
    AB  - Anaerobic biodegradation of solid waste food-residues mixed with fruit-waste was carried out at mesophilic conditions. The goal was to model the sensitivity of biogas generation rate to initial-pH, leachate-level and ash-loading. Two process parameters were analyzed at centre-points while the third factor was set at low-, mid- and high-levels. The simulation results showed that at initial-pH of 5 (low-level), the biogas generation rate was more sensitive to ash-loading than at high-level of initial-pH values. The minimum and maximum attainable biogas generation rates due to perturbations in ash-loading were 0.79 and 1.89 mL/min, respectively, representing a difference of 1.10 mL/min.  A comparison using sensitivity quotient revealed that decreasing leachate-level had a stronger effect on biogas generation rate than increasing it. It was also found that the biodegradation process was over four-times more sensitive to variations in initial-pH than in ash-loading while it was over seven-times more sensitive to variations in initial-pH than in leachate-level. It was concluded that the sensitivity of biogas generation rate was highest to variations in initial-pH and least to variations in leachate-level.
    VL  - 2
    IS  - 3
    ER  - 

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Author Information
  • Department of Chemical and Mining Engineering, College of Engineering and Technology, University of Dar es Salaam, Tanzania

  • Department of Chemical and Mining Engineering, College of Engineering and Technology, University of Dar es Salaam, Tanzania

  • Department of Structural and Construction Engineering, College of Engineering and Technology, University of Dar es Salaam, Tanzania

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