Chaher Nour El Houda, Nassour Abdallah, Hamdi Moktar, Nelles Michael
Department of Chemical and Process Engineering, National Engineering School of Gabes, University of Gabes, Gabes 6029, Tunisia.
Department of Waste and Resource Management, Faculty of Agricultural and Environmental Sciences, University of Rostock, 18051 Rostock, Germany.
Foods. 2021 Oct 3;10(10):2353. doi: 10.3390/foods10102353.
This study proposed the selection of cost-effective additives generated from different activity sectors to enhance and stabilize the start-up, as well as the transitional phases, of semi-continuous food waste (FW) anaerobic digestion. The results showed that combining agricultural waste mixtures including wheat straw (WS) and cattle manure (CM) boosted the process performance and generated up to 95% higher methane yield compared to the control reactors (mono-digested FW) under an organic loading rate (OLR) range of 2 to 3 kg VS/m·d. Whereas R3 amended with unmarketable biochar (UBc), to around 10% of the initial fresh mass inserted, showed a significant process enhancement during the transitional phase, and more particularly at an OLR of 4 kg VS/m·d, it was revealed that under these experimental conditions, FW reactors including UBc showed an increase of 144% in terms of specific biogas yield (SBY) compared to FW reactors fed with agricultural residue. Hence, both agricultural and industrial waste were efficacious when it came to boosting either FW anaerobic performance or AD effluent quality. Although each co-substrate performed under specific experimental conditions, this feature provides decision makers with diverse alternatives to implement a sustainable organic waste management system, conveying sufficient technical details to draw up appropriate designs for the recovery of various types of organic residue.
本研究提出从不同活动部门选择具有成本效益的添加剂，以增强和稳定半连续食物垃圾（FW）厌氧消化的启动阶段和过渡阶段。结果表明，在2至3 kg VS/m·d的有机负荷率（OLR）范围内，将包括小麦秸秆（WS）和牛粪（CM）在内的农业废弃物混合物相结合，可提高工艺性能，与对照反应器（单消化FW）相比，甲烷产量提高了95%。而用不可销售的生物炭（UBc）改良至初始新鲜质量的10%左右的R3，在过渡阶段显示出显著的工艺增强，尤其是在OLR为4 kg VS/m·d时，结果表明，在这些实验条件下，与以农业残渣为原料的FW反应器相比，含UBc的FW反应器的比沼气产量（SBY）提高了144%。因此，无论是农业废弃物还是工业废弃物，在提高FW厌氧性能或AD出水质量方面都很有效。尽管每种共底物都在特定的实验条件下运行，但这一特点为决策者提供了多种实施可持续有机废物管理系统的选择，并提供了足够的技术细节，以便为各种有机残渣的回收制定适当的设计方案。
