期刊
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
卷 125, 期 -, 页码 208-213出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2017.09.020
关键词
Anaerobic digestion; Submerged macrophyte; Alkaline pretreatment; Co-digestion; Neutralizing agent
资金
- Ministry of the Environment, Japan [4-1406]
Alkaline pretreatment for lignocellulosic biomass is beneficial for enhancing the anaerobic digestibility, but the rise of pretreatment cost and the dilution of substrate by the addition of a neutralizing agent and an alkaline solution are significant drawbacks. To solve these problems, utilization of acidified food waste as a co-substrate during anaerobic digestion of alkali-pretreated submerged macrophytes was attempted under various macrophyte to food waste (MF) ratio, and the biochemical interactions between the co-substrates were investigated. The addition of acidified food waste dropped the pH of alkali-pretreated Potamogeton maackianus, which reduced the dosage of neutralizing agent by 50% at MF 1:1. In co-digestion experiment, more CH4 was produced as the dosage of food waste increased. Volatile-solid based and wet-weight-based CH4 yields for MF 1:1 were 37% and 118% higher than those for the alkali-pretreated macrophyte, respectively, because of the high degradability and organic matter content of the food waste. Comparison between the measured and theoretical COD balance of the co-digestion revealed that there is no positive synergistic effect in the CH4 recovery. Instead, the hydrolysis of the co-substrates is inhibited possibly due to the existence of dissolved lignin. Overall, the study demonstrates that anaerobic co-digestion of alkali-pretreated macrophytes and acidified food waste could be a feasible option for reducing the neutralizing agent cost and enhancing the volumetric CH4 yield. (C) 2017 Elsevier Ltd. All rights reserved.
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