沼渣
食品科学
流出物
生物量(生态学)
单细胞蛋白
生物
酵母
人口
稀释
单胃
生物技术
营养物
化学
厌氧消化
发酵
农学
生物化学
环境科学
环境工程
生态学
植物营养
物理
社会学
人口学
热力学
甲烷
作者
Davide Bertasini,Renato L. Binati,Paolo Pavan,Federico Battista
出处
期刊:Chemosphere
[Elsevier]
日期:2022-02-01
卷期号:296: 134076-134076
被引量:12
标识
DOI:10.1016/j.chemosphere.2022.134076
摘要
The increase in human population determines a higher proteins request to sustain the feed demand for animals and aquaculture. Single Cell Proteins (SCPs) consist of mixed protein from pure and mixed culture of bacteria, fungi, algae, and yeast, which are grown and harvested to accomplish the food requirement of human and animals. This work investigated the production of Saccharomyces cerevisiae to be used as SCPs for animal feeding. The effluent of candies production process, rich in sugars, about 40 g/L, and agricultural digestate rich in nitrogen and other macro and micronutrients, were used for the yeast's growth. Preliminary batch tests demonstrated that aerobic conditions optimized the biomass growth. Then, continuous aerobic tests were conducted at different dilution rates. The dilution rate of 0.50 d-1, corresponding to a hydraulic retention time of 2 days, optimized both the biomass productivity of 0.25 g/L per day and the protein content of 28% w/w. The analysis of the aminoacidic profile demonstrated that obtained SCPs could be used as an integrator of feed for fish and monogastric animals. On the contrary, they were not suitable for pet feed as all the amino acids concentrations were lower than required standards. These results suggested that anaerobic digesters in the agricultural sector can be transformed into small biorefineries for microbial protein production.
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