Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy; Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via G. di Biasio 43, 03043 Cassino, Italy.
Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via G. di Biasio 43, 03043 Cassino, Italy.
Bioresour Technol. 2022 Aug;358:127308. doi: 10.1016/j.biortech.2022.127308. Epub 2022 May 12.
The environmental impact of the dairy industry is heavily influenced by the overproduction of nitrogen- and carbon-rich effluents. The present study proposes an innovative process to recover waste contaminated nitrogen from anaerobic digestate while treating excess cheese whey (CW) and producing high-quality, clean single cell protein (SCP). By relying on direct aeration stripping techniques, employing an airflow subsequently used in the aerobic cheese whey fermentation step, the investigated process was able to strip 41-80% of the total ammonium nitrogen (N-NH) from liquid digestate. The stripped ammonia gas (NH) was completely recovered as N-NH in the acidic CW, and further upcycled into SCP having a total protein content of 74.7% and a balanced amino acids profile. A preliminary techno-economic analysis revealed the potential to directly recover and upcycle nitrogen into SCP at costs (4.3-6.3 €·kgN) and energetic inputs (90-132 MJ·kgN) matching those of conventional feed and nitrogen management processes.
乳制品行业的环境影响受到富含氮和碳的废水过度生产的严重影响。本研究提出了一种创新的工艺，可从厌氧消化物中回收废水中受污染的氮，同时处理过剩的奶酪乳清（CW）并生产高质量、清洁的单细胞蛋白（SCP）。通过依赖直接曝气汽提技术，利用随后用于好氧奶酪乳清发酵步骤的气流，可以从液体消化物中汽提 41-80%的总铵氮（N-NH）。汽提的氨气（NH）在酸性 CW 中完全回收为 N-NH，并进一步升级为总蛋白质含量为 74.7%且氨基酸组成平衡的 SCP。初步的技术经济分析表明，具有直接回收和将氮升级为 SCP 的潜力，其成本（4.3-6.3 €·kgN）和能源投入（90-132 MJ·kgN）与传统饲料和氮管理过程相当。
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