Andrea Carvajal , Claudio Sepúlveda , Daniel Navia , Ignacio Poblete-Castro , Fernanda Pinto-Ibieta , Antonio Serrano
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引用次数: 0
Abstract
Dry anaerobic digestion (dry-AD) is an attractive process for solid wastes such as agri-food waste. However, some limitations mainly associated to lack of effective mixing, can hinder the methane production capacity of the systems. Bulking agent (BA) has been proposed as a solution to the compaction issues in systems without mechanical agitation, such as leaching bed reactors. However, effects of BA are still not clear, and, thus, the factors to consider for its dose has not been optimized yet. This work studies the effect of BA in dry-AD. Two substrates with different characteristics were proposed as models, bean peel as a lignocellulosic substrate and a mixture of food waste as a readily biodegradable substrate. Inert plastic rings were used as BA at different BA:S ratios. Assessed BA:S ratio did not affect the performance of methane production for the lignocellulosic waste, but it did significantly affect to the easily biodegradable substrate, showing up to a 28% of methane production increase. This result could be due to the presence of lignocellulosic compounds in the bean peel, behaving like a natural BA. In assays with an increased bed height, the compaction of the system was more severe, resulting in the rapid acidification of the processes. At these conditions, the positive effect of BA addition was more marked, allowing methane production and no acidification of the system. Thus, the addition of BA is a suitable strategy for improving methane production or stability in dry-AD systems without requiring the stirring of the systems.
干式厌氧消化(dry-AD)对于农业食品废物等固体废物来说是一种极具吸引力的工艺。然而,一些主要与缺乏有效混合有关的限制会阻碍系统的甲烷生产能力。有人建议使用增容剂(BA)来解决无机械搅拌系统(如浸出床反应器)中的压实问题。然而,BA 的效果尚不明确,因此其剂量的考虑因素也尚未优化。这项工作研究了 BA 在干-AD 中的影响。提出了两种不同特性的基质作为模型,一种是作为木质纤维素基质的豆皮,另一种是作为易生物降解基质的食物垃圾混合物。惰性塑料环以不同的 BA:S 比例用作 BA。所评估的 BA:S 比率对木质纤维素废物的甲烷生产性能没有影响,但对易生物降解基质的影响很大,甲烷生产量增加了 28%。这一结果可能是由于豆皮中含有木质纤维素化合物,其作用类似于天然生物碱。在增加床层高度的试验中,系统的压实更为严重,导致过程迅速酸化。在这些条件下,添加 BA 的积极效果更为明显,既能产生甲烷,又不会使系统酸化。因此,添加 BA 是提高干式厌氧消化系统甲烷产量或稳定性的一种合适策略,而无需对系统进行搅拌。
期刊介绍:
New Biotechnology is the official journal of the European Federation of Biotechnology (EFB) and is published bimonthly. It covers both the science of biotechnology and its surrounding political, business and financial milieu. The journal publishes peer-reviewed basic research papers, authoritative reviews, feature articles and opinions in all areas of biotechnology. It reflects the full diversity of current biotechnology science, particularly those advances in research and practice that open opportunities for exploitation of knowledge, commercially or otherwise, together with news, discussion and comment on broader issues of general interest and concern. The outlook is fully international.
The scope of the journal includes the research, industrial and commercial aspects of biotechnology, in areas such as: Healthcare and Pharmaceuticals; Food and Agriculture; Biofuels; Genetic Engineering and Molecular Biology; Genomics and Synthetic Biology; Nanotechnology; Environment and Biodiversity; Biocatalysis; Bioremediation; Process engineering.