Journal
JOURNAL OF CLEANER PRODUCTION
Volume 171, Issue -, Pages 1376-1385Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.10.080
Keywords
Anaerobic digestion; Food waste; Energy comparison; Cluster analysis; Control chart; Statistical analysis
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This study compared the performances of single and two-stage anaerobic digestion processes of food waste. The processes were monitored by taking into account both the steady state process performances and the transient conditions. In addition to a conventional univariate analysis, a multivariate analysis to increase the validity of the results of the comparison study was also performed. The transient states caused peaks due to a high organic loading rate, simulating possible overloading events and the recovery capacity of both processes (resilience). The specific gas production of the methanogenic reactor of the two-stage process was higher (0.88 m(3) (biogas)/kgvs) than for the single-stage process (0.75 m(biogas)(3)/kgvs). This finding was related to the increase in the removal efficiency (of 17%). Considering the pilot-scale results, a comparison of mass and energy balance, and costs (assuming the upgrading of the biogas produced) was also discussed. (C) 2017 Elsevier Ltd. All rights reserved.
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