PDF(Pubmed)
Abstract：
A significant fraction of the food produced worldwide is currently lost or wasted throughout the supply chain, squandering natural and economic resources. Food waste valorization will be an important necessity in the coming years. This work investigates the ability of food waste to serve as a viable nutritional substrate for the heterotrophic growth of Chlorella vulgaris. The impact of different pretreatments on the elemental composition and microbial contamination of seven retail food waste mixtures was evaluated. Among the pretreatment methods applied to the food waste formulations, autoclaving was able to eliminate all microbial contamination and increase the availability of reducing sugars by 30%. Ohmic heating was also able to eliminate most of the contaminations in the food wastes in shorter time periods than autoclave. However, it has reduced the availability of reducing sugars, making it less preferable for microalgae heterotrophic cultivation. The direct utilization of food waste containing essential nutrients from fruits, vegetables, dairy and bakery products, and meat on the heterotrophic growth of microalgae allowed a biomass concentration of 2.2 × 108 cells·mL-1, being the culture able to consume more than 42% of the reducing sugars present in the substrate, thus demonstrating the economic and environmental potential of these wastes.
摘要：
目前，全球生产的食品中有很大一部分在整个供应链中丢失或浪费。浪费自然和经济资源。在未来几年中，食物垃圾的价值化将是重要的必要条件。这项工作研究了食物垃圾作为普通小球藻异养生长的可行营养底物的能力。评估了不同预处理对7种零售食品垃圾混合物的元素组成和微生物污染的影响。在应用于食物垃圾配方的预处理方法中，高压灭菌能够消除所有微生物污染，并将还原糖的利用率提高30％。欧姆加热也能够在比高压釜更短的时间内消除食物废物中的大部分污染物。然而,它减少了还原糖的供应，使其不太适合微藻异养培养。直接利用含有水果必需营养素的食物垃圾，蔬菜,乳制品和烘焙产品，并且在微藻的异养生长上的肉允许2.2×108个细胞·mL-1的生物量浓度，即培养物能够消耗底物中42％以上的还原糖，从而证明了这些废物的经济和环境潜力。
