Monitoring of Food Waste Anaerobic Digestion Performance: Conventional Co-Substrates vs. Unmarketable Biochar Additions

Foods

Moktar Hamdi¹  Nour El Houda Chaher²  Abdallah Nassour³  Michael Nelles³ 

[1] Department of Biological and Chemical Engineering, National Institute of Applied Sciences and Technology, University of Carthage, Tunis 1080, Tunisia;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;

关键词: food waste treatment;    co-substrates;    anaerobic co-digestion;    organic loading rate;    AD-effluent quality;   

DOI  :  10.3390/foods10102353

来源: DOAJ

【 摘 要 】

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/m³·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/m³·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.

【 授权许可】

Unknown