Zupančič Gregor Drago, Panjičko Mario, Zelić Bruno
Sustainable Technologies Development Centre Ltd, Dragutina Golika 63, HR-10000 Zagreb, Croatia.
National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia.
Food Technol Biotechnol. 2017 Jun;55(2):187-196. doi: 10.17113/ftb.55.02.17.5080.
Renewable energy sources are becoming increasingly important in the beverage and food industries. In the brewing industry, a significant percentage of the used raw materials finishes the process as secondary resource or waste. The research on the anaerobic digestion of brewer's yeast has been scarce until recent years. One of the reasons for this is its use as a secondary resource in the food industry and as cattle feed. Additionally, market value of brewer's yeast is higher than its energy value. Due to the increase of energy prices, brewer's yeast has become of interest as energy substrate despite its difficult degradability in anaerobic conditions. The anaerobic co-digestion of brewer's yeast and anaerobically treated brewery wastewater was studied using a pilot-scale anaerobic sequencing batch reactor (ASBR) seeded with granular biomass. The experiments showed very good and stable operation with an organic loading rate of up to 8.0 kg/(m·day), and with a maximum achieved organic loading rate of 13.6 kg/(m·day) in a single cycle. A specific biogas productivity of over 0.430 m/kg of the total chemical oxygen demand (COD) inserted, and total COD removal efficiencies of over 90% were achieved. This study suggests that the brewer's yeast can be successfully digested in an ASBR without adverse effects on the biogas production from brewer's yeast/wastewater mixtures of up to 8% (by volume). By using the brewer's yeast in the ASBR process, the biogas production from brewery wastewater could be increased by 50%.
可再生能源在饮料和食品行业正变得越来越重要。在酿造行业，相当大比例的使用过的原材料在加工过程结束时成为二次资源或废弃物。直到近年来，对酿酒酵母厌氧消化的研究一直很少。原因之一是它在食品工业中用作二次资源以及用作牛饲料。此外，酿酒酵母的市场价值高于其能源价值。由于能源价格上涨，尽管酿酒酵母在厌氧条件下难以降解，但它作为能源底物已引起人们的兴趣。使用接种颗粒生物质的中试规模厌氧序批式反应器（ASBR）研究了酿酒酵母与厌氧处理后的啤酒厂废水的厌氧共消化。实验表明，在有机负荷率高达8.0 kg/(m³·天)的情况下，运行非常良好且稳定，在单个周期中最大实现的有机负荷率为13.6 kg/(m³·天)。实现了超过0.430 m³/kg的总化学需氧量（COD）插入量的特定沼气生产率，以及超过90%的总COD去除效率。这项研究表明，酿酒酵母可以在ASBR中成功消化，而不会对高达8%（按体积计）的酿酒酵母/废水混合物的沼气生产产生不利影响。通过在ASBR工艺中使用酿酒酵母，啤酒厂废水的沼气产量可提高50%。
