High solid mono-digestion and co-digestion performance of food waste and sewage sludge by a thermophilic anaerobic membrane bioreactor. (August 2020)

• Record Type: Journal Article
• Authors: Li, Yemei; Cheng, Hui; Guo, Guangze; Zhang, Tao; Qin, Yu; Li, Yu-You
• Is Part Of: Bioresource technology. Volume 310(2020)
• Publication Date: 2020-08
• Subjects: AnMBR -- Biogas -- Sewage sludge -- Food waste -- Co-digestion; 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.2020.123433
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Thermophilic high solid anaerobic digestion was conducted by an AnMBR. Performance of mono- and co-digestion of food waste and sewage sludge was compared. High solid AnMBR was stably operated at high flux. Membrane rejection efficiency on different soluble matters was identified. Abstract: The performance of co-digestion of food waste (FW) and sewage sludge (sludge) by a thermophilic anaerobic membrane bioreactor (ThAnMBR) was firstly investigated. The long-term stable operation showed the feasibility of the utilization of ThAnMBR for mono- and co-digestion of FW and sludge at a high solid condition. Good permeate quality was obtained at all sludge ratios while the addition of sludge restricted the methane generation. For a sludge substitution with a 25% TS-based substrate, the biogas yield of 0.812 L/g-VSfed was at 91% and 158% that of the mono-digestion of FW and sludge, respectively. Membrane performance indicated that the ThAnMBR operated stably at a high flux of 5 LMH under the high solid (~27 g/L) condition. Furthermore, membrane filtration with a 0.1 μm pore size of hollow fiber not only completely removed suspended solids but also rejected about 70% of soluble COD, 80% of soluble carbohydrates and 17% of soluble proteins.