Evaluation of the effect of glycerol supplementation on the anaerobic digestion of real municipal solid waste in batch mode

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• 作者：S. Zahedi^a ; ^b ; R. Solera^a ; ^{rosario.solera@uca.es} ; J.L. Garcí ; a-Morales^a ; H. Ennouri^c ; D. Sales^a
• 关键词：Methane production ; Real municipal solid waste ; Batch mode ; Methanogenic activity ; Glycerol
• 刊名：Fuel
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：193
• 期：Complete
• 页码：15-21
• 全文大小：1084 K
• 卷排序：193

文摘

The effect of low glycerol supplementation (<1% v/v) in the thermophilic anaerobic digestion (AD) of real municipal solid waste (RMSW) on methane production (MP) is not known. This study explores the effect of five different glycerol supplementations (0%, 0.1%, 0.25%, 0.5% and 1%) on effluent characteristics, anaerobic consortia and MP. Specifically, by adding 0.25% v/v crude glycerol to the feed, the methane production rate increased by 48% (from 7.40 ± 1.17 l CH4/l to 11.01 ± 1.66 l CH4/l), in line with the increase in total volatile solids (TVS) removal (from 65 ± 7% to 81 ± 7) and methanogenic activity (from 110 ∗ 10−12 ± 17 ∗ 10−12 l CH4/cell to 156 ∗ 10−12 ± 24 ∗ 10−12 l CH4/cell). Extra glycerol added to the feed (0.5% or 1%) was shown to be non-feasible for thermophilic AD of RMSW, as inhibition of methanogenesis was observed. Fluorescent in situ hybridization (FISH) studies showed that the percentages of Eubacteria, Archaea, H2-utilising methanogens (HUM) and acetate-utilising methanogens (AUM) were stable within the 94.0–97.0%, 6.0–3.0%, 1.8–3.6% and 0.6–2.8% ranges, respectively.