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Technical assessment of bioenergy recovery from cotton stalks through anaerobic digestion process and the effects of inexpensive pre-treatments


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  • Adl, Mehrdad
  • Sheng, Kuichuan
  • Gharibi, Arash
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    Methane yields from cotton stalks have been reported in the range of 0.022–0.150Nm3/kg-VS in the preceding studies. In this study, hydrothermal pre-treatment of cotton stalks was performed under atmospheric conditions prior to anaerobic digestion process through which, three agents were examined; hot water, dilute ammonia solution containing 2% NH3 (dry matter basis), and recycled liquid from anaerobic process. All three options increased methane yield but the highest results (over 0.200Nm3/kg-VS) were obtained by utilization of recycled process liquid (PL) under an adjusted ammonia content and C:N ratio, which was achieved by dilution of PL with water as well as application of stabilized swine sludge as a nitrogen rich inoculum. The energy balance evaluation of the overall process revealed that bioenergy recovery from pre-treated cotton stalks by anaerobic digestion is feasible and viable only at feed streams with above 10% solids content, methane yield above 0.175Nm3/kg-VS and with heat recovery from hydrothermal pre-treatment tank. A methane yield of 0.184Nm3/kg-VS was observed under semi-continuous feeding of PL treated stalks to a hybrid plug-flow pilot reactor.

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    Bibliographic Info

    Article provided by Elsevier in its journal Applied Energy.

    Volume (Year): 93 (2012)
    Issue (Month): C ()
    Pages: 251-260

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    Handle: RePEc:eee:appene:v:93:y:2012:i:c:p:251-260

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    Keywords: Biogas; Lignocellulosic; Hydrothermal; Energy balance; Methane yield; Cotton;


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    Cited by:
    1. Koch, Konrad & Drewes, Jörg E., 2014. "Alternative approach to estimate the hydrolysis rate constant of particulate material from batch data," Applied Energy, Elsevier, vol. 120(C), pages 11-15.
    2. Passos, Fabiana & Solé, Maria & García, Joan & Ferrer, Ivet, 2013. "Biogas production from microalgae grown in wastewater: Effect of microwave pretreatment," Applied Energy, Elsevier, vol. 108(C), pages 168-175.


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