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Batch anaerobic co-digestion of pig manure with dewatered sewage sludge under mesophilic conditions

Listed author(s):
  • Zhang, Wanqin
  • Wei, Quanyuan
  • Wu, Shubiao
  • Qi, Dandan
  • Li, Wei
  • Zuo, Zhuang
  • Dong, Renjie
Registered author(s):

    The objective of this study was to investigate the characteristic of anaerobic co-digestion of pig manure (PM) with dewatered sewage sludge (DSS). The batch experiment was conducted under mesophilic (37±1°C) conditions at five different PM/DSS volatile solid (VS) ratios of 1:0, 2:1, 1:1, 1:2, and 0:1. The batch test evaluated the methane potential, methane production rate of the PM co-digestion with DSS at different mixing ratios. The first-order kinetic model and modified Gompertz model were also introduced to predict the methane yield and evaluate the kinetic parameters. The optimum mixing ratio of PM with DSS was 2:1 and the cumulative methane yield (CMY) was 315.8mL/gVSadded, which is greater by 82.4% than that of digesting DSS alone. This result might be due to the positive synergy of PM with DSS, which resulted in an active microbial activity and a higher hydrolytic capacity of DSS. The systems with co-digestion of PM and DSS was demonstrated to be more stable. The modified Gompertz model (R2: 0.976–0.999) showed a better fit to the experimental results and the calculated parameters indicated that the co-digestion of PM with DSS markedly improved the methane production rate and shortened the effective methane production time.

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    Article provided by Elsevier in its journal Applied Energy.

    Volume (Year): 128 (2014)
    Issue (Month): C ()
    Pages: 175-183

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    Handle: RePEc:eee:appene:v:128:y:2014:i:c:p:175-183
    DOI: 10.1016/j.apenergy.2014.04.071
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