Using an expended granular sludge bed reactor for advanced anaerobic digestion of food waste pretreated with enzyme: The feasibility and its performance. (September 2020)

• Record Type: Journal Article
• Authors: Zhang, Sitong; Zou, Lianpei; Wan, Yulan; Ye, Min; Ye, Jiongjiong; Li, Yu-You; Liu, Jianyong
• Is Part Of: Bioresource technology. Volume 311(2020)
• Publication Date: 2020-09
• Subjects: Food waste -- Advanced anaerobic digestion -- Suspended solid -- Expanded granular sludge bed -- Enzymatic pretreatment; 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.2020.123504
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: EGSB reactor was firstly used for methane production from FW pretreated by enzyme. SS accumulation in an EGSB reactor treating FW pretreated by enzyme was predicted. OLR of 20 g COD/L.d with COD removal of 88% proved advanced AD of FW in EGSB. Abstract: The high content of solid organics in food waste (FW) results in a low and unstable anaerobic digestion (AD) efficiency. Improving methane production rate and process stability is attracting much attention towards advanced AD of FW. The feasibility of advanced AD of FW pretreated with enzyme was investigated by batch experiments and 164 days running of an expanded granular sludge bed (EGSB) reactor. Simulation study based on the results of batch experiments indicates it is possible to treat enzymatically pretreated FW using an EGSB reactor. During the running of an EGSB reactor, the organic loading rate went up to 20 g chemical oxygen demand (COD)/L.d, and the total COD removal rate reached 88%. The significance of this study is to achieve an advanced AD of enzymatically pretreated FW with a stable and efficient methane production with biogas residue being reduced greatly.