Comparison of Batch and semi-comtinuous acidogenic process of Food waste anaerobic digestion

During food waste anaerobic digestion (AD), higher rate of acidogenesis than the methanogenesis affects the stability of the reactor in a single-phase AD system. To decouple the acidogenesis from methanogenesis with the purpose to optimize each reactor separately, in recent years, a two-phase AD is proposed, especially to treat high solid food waste. In the two-phase system, leach bed reactor (LBR) as the first phase, i.e. hydrolysis-acidogenesis, of the two-phase system has gained more attention due to its operational simplicity and efficiency for organic wastes with high solids content.

Further Authors:
S.Y. Xu - Hong Kong Baptist University

In most cases, the LBRs were operated in batch mode and its efficiency in a continuous loading has not been studied in detail. LBR batch system usually requires longer retention time to completely exhaust the methane production potential; and also requires a large volume of inoculum per batch, which reduces the effective reactor volume resulting in higher operational costs. To overcome this, LBR can be operated in semi-continuous feeding mode and connected to a high rate methanogenic reactor. Since acidogenesis and methanogenesis are mediated by different groups of microbes with different ecological requirements, an understanding of these microbial dynamics offers information to significantly improve the methane production and overall operation. Therefore, the aim of the present study is to examine the stability and sustainability of a two-phase LBR-UASB system operated in semi-continuous feeding mode with different feeding frequencies.

Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2012 (Juni 2012)
Seiten: 8
Preis inkl. MwSt.: € 8,00
Autor: J. W. C. Wong
Dr Ammaiyappan Selvam

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von Dr Ammaiyappan Selvam (HKBU), 19.07.2016
I am one of the authors of this publication. Can I have a copy of this article for my record. In addition, Please provide the title page and the ISBN number.

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