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Enhancement of sludge anaerobic biodegradability by combined microwave-H2O2 pretreatment in acidic conditions

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Abstract

The aim of this study was to increase the sludge disintegration and reduce the cost of microwave (MW) pretreatment. Thermodynamic analysis of MW hydrolysis revealed the best fit with a first-order kinetic model at a specific energy of 18,600 kJ/kg total solids (TS). Combining H2O2 with MW resulted in a significant increment in solubilization from 30 to 50 % at 18,600 kJ/kg TS. The pH of H2O2-assisted MW-pretreated sludge (MW + H2O2) was in the alkaline range (pH 9–10), and it made the sludge unfavorable for subsequent anaerobic digestion and inhibits methane production. In order to nullify the alkaline effect caused by the MW + H2O2 combination, the addition of acid was considered for pH adjustment. H2O2-assisted MW-pretreated sludge in acidic conditions (MW + H2O2 + acid) showed a maximum methane production of 323 mL/g volatile solids (VS) than others during anaerobic biodegradability. A cost analysis of this study reveals that MW + H2O2 + acid was the most economical method with a net profit of 59.90 €/t of sludge.

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Acknowledgments

The authors are thankful to DST, India for giving economic support for this assignment (SR/FTP/ETA-0021/2010) under their Young Scientist Scheme.

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Authors and Affiliations

  1. Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, 627007, India

    Parvathy Eswari, S. Kavitha & J. Rajesh Banu

  2. Department of Civil Engineering, Ponjesly College of Engineering, Nagercoil, India

    S. Kaliappan

  3. Department of Civil and Environmental Engineering, Sungkyunkwan University, Seoul, South Korea

    Ick-Tae Yeom

Authors
  1. Parvathy Eswari
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  2. S. Kavitha
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  3. S. Kaliappan
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  4. Ick-Tae Yeom
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  5. J. Rajesh Banu
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Correspondence to J. Rajesh Banu.

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Responsible editor: Gerald Thouand

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Eswari, P., Kavitha, S., Kaliappan, S. et al. Enhancement of sludge anaerobic biodegradability by combined microwave-H2O2 pretreatment in acidic conditions. Environ Sci Pollut Res 23, 13467–13479 (2016). https://doi.org/10.1007/s11356-016-6543-2

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  • DOI: https://doi.org/10.1007/s11356-016-6543-2

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