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Electrogenesis reduces the combustion efficiency of sewage sludge

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  • Ma, Jinxing
  • Wang, Zhiwei
  • Zhu, Chaowei
  • Xu, Yinlun
  • Wu, Zhichao

Abstract

Electrogenesis in microbial fuel cells (MFCs) is a promising approach to extract useful energy from sewage sludge. However, its impact on ultimate sludge disposal (e.g., incineration) has not been well evaluated. In the present work, thermogravimetry and differential scanning calorimetry were carried out to investigate the combustion efficiency of recovered organic matter (ROM) and waste activated sludge (WAS) in the electrogenesis process. In order to reduce the dimensionality of thermograms and to identify the predominant reactions, principal component analysis (PCA) was used for data processing. Two principal components (PC1 and PC2) were extracted from the derivative thermogravimetry, including three exothermic reactions associated with terrestrial organic matter, metabolic products, and acetylated substances. The variation of thermal kinetic characteristics revealed that energy densities of ROM and WAS were decreased after electrogenesis, and the thermograms shifted towards higher reaction temperatures, suggesting that electrogenesis might reduce the combustion efficiency of sewage sludge. Although no power was produced in open-circuit MFCs, more than 20% of the energy content of ROM and WAS was lost during the fermentation process, indicating that low Coulombic efficiency is inevitable in the treatment of sewage sludge with MFCs.

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  • Ma, Jinxing & Wang, Zhiwei & Zhu, Chaowei & Xu, Yinlun & Wu, Zhichao, 2014. "Electrogenesis reduces the combustion efficiency of sewage sludge," Applied Energy, Elsevier, vol. 114(C), pages 283-289.
    • Handle: RePEc:eee:appene:v:114:y:2014:i:c:p:283-289
    DOI: 10.1016/j.apenergy.2013.09.049
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    Cited by:

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    2. Ju-Hyoung Park & Min-Ho Jin & Young-Joo Lee & Gyu-Seob Song & Jong Won Choi & Dong-Wook Lee & Young-Chan Choi & Se-Joon Park & Kwang Ho Song & Joeng-Geun Kim, 2019. "Two-in-One Fuel Synthetic Bioethanol-Lignin from Lignocellulose with Sewage Sludge and Its Air Pollutants Reduction Effects," Energies, MDPI, vol. 12(16), pages 1-15, August.
    3. Ni, Zhanshi & Bi, Haobo & Jiang, Chunlong & Sun, Hao & Zhou, Wenliang & Qiu, Zhicong & He, Liqun & Lin, Qizhao, 2022. "Research on the co-pyrolysis of coal slime and lignin based on the combination of TG-FTIR, artificial neural network, and principal component analysis," Energy, Elsevier, vol. 261(PA).

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