A holistic approach for food waste management towards zero-solid disposal and energy/resource recovery. (March 2017)

• Record Type: Journal Article
• Authors: Ma, Yingqun; Yin, Yao; Liu, Yu
• Is Part Of: Bioresource technology. Volume 228(2017)
• Page Start: 56
• Page End: 61
• Publication Date: 2017-03
• Subjects: Food waste -- Fungal mash -- Anaerobic digestion -- Fertilizer -- Zero-solid disposal; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2016.12.090
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Fungal mash rich in hydrolytic enzymes was produced from food waste. Ultrafast hydrolysis of food waste was realized in 8 h with fungal mash. The solid residue with adequate NPK contents can be readily used as biofertilizer. The separated liquor with a SCOD of 99 g/L was used for biomethane production. The method led to nearly zero-solid discharge of food waste with energy recovery. Abstract: This study developed a holistic approach which was based on the ultra-fast hydrolysis of food waste with the fungal mash rich in various hydrolytic enzymes produced in situ from food waste as well. After the 8-h hydrolytic treatment, the solid residue and liquor were separated. It was found that the produced solid residue can meet all the requirements for biofertilizer in terms of NPK and heavy metal contents, while the separated liquor with high soluble organics concentration was further subject to anaerobic digestion for enhanced biomethane production. The results showed that 0.41 kg of biofertilizer with a moisture content of 76.9% and 54.4 L of biomethane could be produced from 1 kg of food waste. As such, it is expected that this study may lead to the paradigm shift in food waste management with the ultimate target of zero-solid discharge.