Enhancing the hydrolysis and methane production potential of mixed food waste by an effective enzymatic pretreatment.
In this study, a fungal mash rich in hydrolytic enzymes was produced by solid state fermentation (SSF) of waste cake in a simple and efficient manner and was further applied for high-efficiency hydrolysis of mixed food wastes (FW). The enzymatic pretreatment of FW with this fungal mash resulted in 89.1 g/L glucose, 2.4 g/L free amino nitrogen, 165 g/L soluble chemical oxygen demand (SCOD) and 64% reduction in volatile solids within 24h. The biomethane yield and production rate from FW pretreated with the fungal mash were found to be respectively about 2.3 and 3.5-times higher than without pretreatment. After anaerobic digestion of pretreated FW, a volatile solids removal of 80.4±3.5% was achieved. The pretreatment of mixed FW with the fungal mash produced in this study is a promising option for enhancing anaerobic digestion of FW in terms of energy recovery and volume reduction.
Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore.
Esra Uçkun
EU
Kiran
Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore.
Antoine P
AP
Trzcinski
Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. Electronic address: cyliu@ntu.edu.sg.
Yu
Y
Liu
D000332:Aerobiosis; D000693:Anaerobiosis; D001230:Aspergillus / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D005502:Food; D005087:Glucan 1,4-alpha-Glucosidase / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis*; D009584:Nitrogen / Q000378:metabolism; D012995:Solubility; D014866:Waste Products
D014866:Waste Products; D005087:Glucan 1,4-alpha-Glucosidase; D005947:Glucose; D009584:Nitrogen; D008697:Methane
Anaerobic digestion; Enzymatic pretreatment; Food waste; Fungal mash; Solid state fermentation